app: [Windows] suppress double-click behaviour for custom decorations

Fixes: https://todo.sr.ht/~eliasnaur/gio/600
Signed-off-by: Elias Naur <mail@eliasnaur.com>

.builds/apple.yml

@@ -8,23 +8,28 @@ packages:
  - libxml2-dev
  - libssl-dev
  - libz-dev
- - llvm-dev # for cctools
- - uuid-dev ## for cctools
+ - llvm-dev # cctools
+ - uuid-dev # cctools
+ - ninja-build # cctools
+ - systemtap-sdt-dev # cctools
+ - libbsd-dev # cctools
+ - linux-libc-dev # cctools
  - libplist-utils # for gogio
 sources:
  - https://git.sr.ht/~eliasnaur/applesdks
  - https://git.sr.ht/~eliasnaur/gio
  - https://git.sr.ht/~eliasnaur/giouiorg
- - https://github.com/tpoechtrager/cctools-port.git
- - https://github.com/tpoechtrager/apple-libtapi.git
- - https://github.com/mackyle/xar.git
+ - https://github.com/tpoechtrager/cctools-port
+ - https://github.com/tpoechtrager/apple-libtapi
+ - https://github.com/tpoechtrager/apple-libdispatch
+ - https://github.com/mackyle/xar
 environment:
    APPLE_TOOLCHAIN_ROOT: /home/build/appletools
    PATH: /home/build/sdk/go/bin:/home/build/go/bin:/usr/bin
 tasks:
  - install_go: |
      mkdir -p /home/build/sdk
-     curl -s https://dl.google.com/go/go1.17.7.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl -s https://dl.google.com/go/go1.22.2.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
  - prepare_toolchain: |
      mkdir -p $APPLE_TOOLCHAIN_ROOT
      cd $APPLE_TOOLCHAIN_ROOT
@@ -42,6 +47,11 @@ tasks:
  - install_appletoolchain: |
      cd giouiorg
      go build -o $APPLE_TOOLCHAIN_ROOT/tools ./cmd/appletoolchain
+ - build_libdispatch: |
+     cd apple-libdispatch
+     cmake -G Ninja -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DCMAKE_INSTALL_PREFIX=$APPLE_TOOLCHAIN_ROOT/libdispatch .
+     ninja
+     ninja install
  - build_xar: |
      cd xar/xar
      ac_cv_lib_crypto_OpenSSL_add_all_ciphers=yes CC=clang ./autogen.sh --prefix=/usr
@@ -53,7 +63,7 @@ tasks:
      ./install.sh
  - build_cctools: |
      cd cctools-port/cctools
-     ./configure --prefix $APPLE_TOOLCHAIN_ROOT/toolchain --with-libtapi=$APPLE_TOOLCHAIN_ROOT/libtapi --target=x86_64-apple-darwin19
+     ./configure --target=x86_64-apple-darwin19 --prefix $APPLE_TOOLCHAIN_ROOT/toolchain --with-libtapi=$APPLE_TOOLCHAIN_ROOT/libtapi --with-libdispatch=$APPLE_TOOLCHAIN_ROOT/libdispatch --with-libblocksruntime=$APPLE_TOOLCHAIN_ROOT/libdispatch
      make install
  - test_macos: |
      cd gio
@@ -62,13 +72,3 @@ tasks:
  - test_ios: |
      cd gio
      CC=$APPLE_TOOLCHAIN_ROOT/tools/clang-ios GOOS=darwin GOARCH=arm64 CGO_ENABLED=1 go build -tags ios ./...
- - install_gogio: |
-     cd gio/cmd
-     go install ./gogio
- - test_ios_gogio: |
-     mkdir tmp
-     cd tmp
-     go mod init example.com
-     go get -d gioui.org/example/kitchen
-     export PATH=/home/build/appletools/bin:$PATH
-     gogio -target ios -o app.app gioui.org/example/kitchen

.builds/freebsd.yml

@@ -16,10 +16,7 @@ environment:
 tasks:
  - install_go: |
      mkdir -p /home/build/sdk
-     curl https://dl.google.com/go/go1.17.7.freebsd-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl https://dl.google.com/go/go1.22.2.freebsd-amd64.tar.gz | tar -C /home/build/sdk -xzf -
  - test_gio: |
      cd gio
      go test ./...
- - test_cmd: |
-     cd gio/cmd
-     go test ./...

.builds/linux.yml

@@ -3,6 +3,7 @@ image: debian/testing
 packages:
  - curl
  - pkg-config
+ - gcc-multilib
  - libwayland-dev
  - libx11-dev
  - libx11-xcb-dev
@@ -24,12 +25,11 @@ packages:
  - scrot
  - sway
  - grim
- - wine
  - unzip
 sources:
  - https://git.sr.ht/~eliasnaur/gio
 environment:
- GOFLAGS: -mod=readonly
+ PKG_CONFIG_PATH: /usr/lib/x86_64-linux-gnu/pkgconfig/:/usr/lib/i386-linux-gnu/pkgconfig/
  PATH: /home/build/sdk/go/bin:/usr/bin:/home/build/go/bin:/home/build/android/tools/bin
  ANDROID_SDK_ROOT: /home/build/android
  android_sdk_tools_zip: sdk-tools-linux-3859397.zip
@@ -40,7 +40,7 @@ secrets:
 tasks:
  - install_go: |
      mkdir -p /home/build/sdk
-     curl -s https://dl.google.com/go/go1.17.7.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl -s https://dl.google.com/go/go1.22.2.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
  - check_gofmt: |
      cd gio
      test -z "$(gofmt -s -l .)"
@@ -54,20 +54,19 @@ tasks:
             exit 1
         fi
      done
+ - mirror: |
+     # mirror to github
+     ssh-keyscan github.com > "$HOME"/.ssh/known_hosts && cd gio && git push --mirror "$github_mirror" || echo "failed mirroring"
+ - add_32bit_arch: |
+     sudo dpkg --add-architecture i386
+     sudo apt-get update
+     sudo apt-get install -y "libwayland-dev:i386" "libx11-dev:i386" "libx11-xcb-dev:i386" "libxkbcommon-dev:i386" "libxkbcommon-x11-dev:i386" "libgles2-mesa-dev:i386" "libegl1-mesa-dev:i386" "libffi-dev:i386" "libvulkan-dev:i386" "libxcursor-dev:i386"
  - test_gio: |
      cd gio
      go test -race ./...
+     CGO_ENABLED=1 GOARCH=386 go test ./...
      GOOS=windows go test -exec=wine ./...
      GOOS=js GOARCH=wasm go build -o /dev/null ./...
- - install_chrome: |
-     curl -s https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
-     sudo sh -c 'echo "deb [arch=amd64] https://dl-ssl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google.list'
-     sudo apt-get -qq update
-     sudo apt-get -qq install -y google-chrome-stable
- - test_cmd: |
-     cd gio/cmd
-     go test ./...
-     go test -race ./...
  - install_jdk8: |
      curl -so jdk.deb "https://cdn.azul.com/zulu/bin/zulu8.42.0.21-ca-jdk8.0.232-linux_amd64.deb"
      sudo apt-get -qq install -y -f ./jdk.deb
@@ -81,21 +80,11 @@ tasks:
      unzip -q ndk.zip
      rm ndk.zip
      mv android-ndk-* ndk-bundle
+     # sdkmanager needs lots of file descriptors
+     ulimit -n 10000
      yes|sdkmanager --licenses
      sdkmanager "platforms;android-31" "build-tools;32.0.0"
  - test_android: |
      cd gio
      CC=$ANDROID_SDK_ROOT/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/aarch64-linux-android29-clang GOOS=android GOARCH=arm64 CGO_ENABLED=1 go build ./...
      CC=$ANDROID_SDK_ROOT/ndk-bundle/toolchains/llvm/prebuilt/linux-x86_64/bin/armv7a-linux-androideabi29-clang GOOS=android GOARCH=arm CGO_ENABLED=1 go build ./...
- - install_gogio: |
-     cd gio/cmd
-     go install ./gogio
- - test_android_gogio: |
-     mkdir tmp
-     cd tmp
-     go mod init example.com
-     go get -d gioui.org/example/kitchen
-     gogio -target android gioui.org/example/kitchen
- - mirror: |
-     # mirror to github
-     ssh-keyscan github.com > "$HOME"/.ssh/known_hosts && cd gio && git push --mirror "$github_mirror" || echo "failed mirroring"

.builds/openbsd.yml

@@ -10,12 +10,9 @@ environment:
 tasks:
  - install_go: |
      mkdir -p /home/build/sdk
-     curl https://dl.google.com/go/go1.17.7.src.tar.gz | tar -C /home/build/sdk -xzf -
+     curl https://dl.google.com/go/go1.22.2.src.tar.gz | tar -C /home/build/sdk -xzf -
      cd /home/build/sdk/go/src
      ./make.bash
  - test_gio: |
      cd gio
      go test ./...
- - test_cmd: |
-     cd gio/cmd
-     go test ./...

.gitignore

@@ -1,2 +0,0 @@
-.gradle
-**/android/build

README.md

@@ -24,3 +24,12 @@ account is required and you can post without being subscribed.
 See the [contribution guide](https://gioui.org/doc/contribute) for more details.
 
 An [official GitHub mirror](https://github.com/gioui/gio) is available.
+
+## Tags
+
+Pre-1.0 tags are provided for reference only, and do not designate releases with ongoing support. Bugfixes will not be backported to older tags.
+
+Tags follow semantic versioning. In particular, as the major version is zero:
+
+- breaking API or behavior changes will increment the *minor* version component.
+- non-breaking changes will increment the *patch* version component.

app/GioActivity.java

@@ -5,16 +5,30 @@ package org.gioui;
 import android.app.Activity;
 import android.os.Bundle;
 import android.content.res.Configuration;
+import android.view.ViewGroup;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.FrameLayout;
 
 public final class GioActivity extends Activity {
 	private GioView view;
+	public FrameLayout layer;
 
 	@Override public void onCreate(Bundle state) {
-		super.onCreate(state);
+            super.onCreate(state);
 
-		this.view = new GioView(this);
+            layer = new FrameLayout(this);
+            view = new GioView(this);
 
-		setContentView(view);
+            view.setLayoutParams(new FrameLayout.LayoutParams(
+                FrameLayout.LayoutParams.MATCH_PARENT,
+                FrameLayout.LayoutParams.MATCH_PARENT
+            ));
+            view.setFocusable(true);
+            view.setFocusableInTouchMode(true);
+
+            layer.addView(view);
+            setContentView(layer);
 	}
 
 	@Override public void onDestroy() {

app/GioView.java

@@ -26,6 +26,7 @@ import android.text.SpannableStringBuilder;
 import android.util.AttributeSet;
 import android.util.TypedValue;
 import android.view.Choreographer;
+import android.view.Display;
 import android.view.KeyCharacterMap;
 import android.view.KeyEvent;
 import android.view.MotionEvent;
@@ -64,8 +65,8 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 	private final InputMethodManager imm;
 	private final float scrollXScale;
 	private final float scrollYScale;
+	private final AccessibilityManager accessManager;
 	private int keyboardHint;
-	private AccessibilityManager accessManager;
 
 	private long nhandle;
 
@@ -105,6 +106,8 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 			scrollYScale = px;
 		}
 
+		setHighRefreshRate();
+
 		accessManager = (AccessibilityManager)context.getSystemService(Context.ACCESSIBILITY_SERVICE);
 		imm = (InputMethodManager)context.getSystemService(Context.INPUT_METHOD_SERVICE);
 		nhandle = onCreateView(this);
@@ -255,6 +258,59 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		this.setBarColor(Bar.NAVIGATION, color, luminance);
 	}
 
+	private void setHighRefreshRate() {
+		Context context = getContext();
+		Display display = context.getDisplay();
+		Display.Mode[] supportedModes = display.getSupportedModes();
+		if (supportedModes.length <= 1) {
+			// Nothing to set
+			return;
+		}
+
+		Display.Mode currentMode = display.getMode();
+		int currentWidth = currentMode.getPhysicalWidth();
+		int currentHeight = currentMode.getPhysicalHeight();
+
+		float minRefreshRate = -1;
+		float maxRefreshRate = -1;
+		float bestRefreshRate = -1;
+		int bestModeId = -1;
+		for (Display.Mode mode : supportedModes) {
+			float refreshRate = mode.getRefreshRate();
+			float width = mode.getPhysicalWidth();
+			float height = mode.getPhysicalHeight();
+
+			if (minRefreshRate == -1 || refreshRate < minRefreshRate) {
+				minRefreshRate = refreshRate;
+			}
+			if (maxRefreshRate == -1 || refreshRate > maxRefreshRate) {
+				maxRefreshRate = refreshRate;
+			}
+
+			boolean refreshRateIsBetter = bestRefreshRate == -1 || refreshRate > bestRefreshRate;
+			if (width == currentWidth && height == currentHeight && refreshRateIsBetter) {
+				int modeId = mode.getModeId();
+				bestRefreshRate = refreshRate;
+				bestModeId = modeId;
+			}
+		}
+
+		if (bestModeId == -1) {
+			// Not expecting this but just in case
+			return;
+		}
+
+		if (minRefreshRate == maxRefreshRate) {
+			// Can't improve the refresh rate
+			return;
+		}
+
+		Window window = ((Activity) context).getWindow();
+		WindowManager.LayoutParams layoutParams = window.getAttributes();
+		layoutParams.preferredDisplayModeId = bestModeId;
+		window.setAttributes(layoutParams);
+	}
+
 	@Override protected boolean dispatchHoverEvent(MotionEvent event) {
 		if (!accessManager.isTouchExplorationEnabled()) {
 			return super.dispatchHoverEvent(event);
@@ -555,7 +611,11 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		@Override public int getCursorCapsMode(int reqModes) {
 			Snippet snip = getSnippet();
 			int selStart = imeSelectionStart(nhandle);
-			return TextUtils.getCapsMode(snip.snippet, imeToUTF16(nhandle, selStart), reqModes);
+			int off = imeToUTF16(nhandle, selStart - snip.offset);
+			if (off < 0 || off > snip.snippet.length()) {
+				return 0;
+			}
+			return TextUtils.getCapsMode(snip.snippet, off, reqModes);
 		}
 
 		@Override public ExtractedText getExtractedText(ExtractedTextRequest request, int flags) {

app/app.go

@@ -3,8 +3,16 @@
 package app
 
 import (
+	"image"
 	"os"
+	"path/filepath"
 	"strings"
+	"time"
+
+	"gioui.org/io/input"
+	"gioui.org/layout"
+	"gioui.org/op"
+	"gioui.org/unit"
 )
 
 // extraArgs contains extra arguments to append to
@@ -14,10 +22,93 @@ import (
 // Set with the go linker flag -X.
 var extraArgs string
 
-func init() {
-	if extraArgs != "" {
-		args := strings.Split(extraArgs, "|")
-		os.Args = append(os.Args, args...)
+// ID is the app id exposed to the platform.
+//
+// On Android ID is the package property of AndroidManifest.xml,
+// on iOS ID is the CFBundleIdentifier of the app Info.plist,
+// on Wayland it is the toplevel app_id,
+// on X11 it is the X11 XClassHint.
+//
+// ID is set by the [gioui.org/cmd/gogio] tool or manually with the -X linker flag. For example,
+//
+//	go build -ldflags="-X 'gioui.org/app.ID=org.gioui.example.Kitchen'" .
+//
+// Note that ID is treated as a constant, and that changing it at runtime
+// is not supported. The default value of ID is filepath.Base(os.Args[0]).
+var ID = ""
+
+// A FrameEvent requests a new frame in the form of a list of
+// operations that describes the window content.
+type FrameEvent struct {
+	// Now is the current animation. Use Now instead of time.Now to
+	// synchronize animation and to avoid the time.Now call overhead.
+	Now time.Time
+	// Metric converts device independent dp and sp to device pixels.
+	Metric unit.Metric
+	// Size is the dimensions of the window.
+	Size image.Point
+	// Insets represent the space occupied by system decorations and controls.
+	Insets Insets
+	// Frame completes the FrameEvent by drawing the graphical operations
+	// from ops into the window.
+	Frame func(frame *op.Ops)
+	// Source is the interface between the window and widgets.
+	Source input.Source
+}
+
+// ViewEvent provides handles to the underlying window objects for the
+// current display protocol.
+type ViewEvent interface {
+	implementsViewEvent()
+	ImplementsEvent()
+	// Valid will return true when the ViewEvent does contains valid handles.
+	// If a window receives an invalid ViewEvent, it should deinitialize any
+	// state referring to handles from a previous ViewEvent.
+	Valid() bool
+}
+
+// Insets is the space taken up by
+// system decoration such as translucent
+// system bars and software keyboards.
+type Insets struct {
+	// Values are in pixels.
+	Top, Bottom, Left, Right unit.Dp
+}
+
+// NewContext is shorthand for
+//
+//	layout.Context{
+//	  Ops: ops,
+//	  Now: e.Now,
+//	  Source: e.Source,
+//	  Metric: e.Metric,
+//	  Constraints: layout.Exact(e.Size),
+//	}
+//
+// NewContext calls ops.Reset and adjusts ops for e.Insets.
+func NewContext(ops *op.Ops, e FrameEvent) layout.Context {
+	ops.Reset()
+
+	size := e.Size
+
+	if e.Insets != (Insets{}) {
+		left := e.Metric.Dp(e.Insets.Left)
+		top := e.Metric.Dp(e.Insets.Top)
+		op.Offset(image.Point{
+			X: left,
+			Y: top,
+		}).Add(ops)
+
+		size.X -= left + e.Metric.Dp(e.Insets.Right)
+		size.Y -= top + e.Metric.Dp(e.Insets.Bottom)
+	}
+
+	return layout.Context{
+		Ops:         ops,
+		Now:         e.Now,
+		Source:      e.Source,
+		Metric:      e.Metric,
+		Constraints: layout.Exact(size),
 	}
 }
 
@@ -44,3 +135,15 @@ func DataDir() (string, error) {
 func Main() {
 	osMain()
 }
+
+func (FrameEvent) ImplementsEvent() {}
+
+func init() {
+	if extraArgs != "" {
+		args := strings.Split(extraArgs, "|")
+		os.Args = append(os.Args, args...)
+	}
+	if ID == "" {
+		ID = filepath.Base(os.Args[0])
+	}
+}

app/d3d11_windows.go

@@ -20,7 +20,7 @@ type d3d11Context struct {
 	width, height int
 }
 
-const debug = false
+const debugDirectX = false
 
 func init() {
 	drivers = append(drivers, gpuAPI{
@@ -28,7 +28,7 @@ func init() {
 		initializer: func(w *window) (context, error) {
 			hwnd, _, _ := w.HWND()
 			var flags uint32
-			if debug {
+			if debugDirectX {
 				flags |= d3d11.CREATE_DEVICE_DEBUG
 			}
 			dev, ctx, _, err := d3d11.CreateDevice(
@@ -60,10 +60,10 @@ func (c *d3d11Context) RenderTarget() (gpu.RenderTarget, error) {
 }
 
 func (c *d3d11Context) Present() error {
-	err := c.swchain.Present(1, 0)
-	if err == nil {
-		return nil
-	}
+	return wrapErr(c.swchain.Present(1, 0))
+}
+
+func wrapErr(err error) error {
 	if err, ok := err.(d3d11.ErrorCode); ok {
 		switch err.Code {
 		case d3d11.DXGI_STATUS_OCCLUDED:
@@ -84,7 +84,7 @@ func (c *d3d11Context) Refresh() error {
 	}
 	c.releaseFBO()
 	if err := c.swchain.ResizeBuffers(0, 0, 0, d3d11.DXGI_FORMAT_UNKNOWN, 0); err != nil {
-		return err
+		return wrapErr(err)
 	}
 	c.width = width
 	c.height = height
@@ -122,7 +122,7 @@ func (c *d3d11Context) Release() {
 		d3d11.IUnknownRelease(unsafe.Pointer(c.dev), c.dev.Vtbl.Release)
 	}
 	*c = d3d11Context{}
-	if debug {
+	if debugDirectX {
 		d3d11.ReportLiveObjects()
 	}
 }

app/doc.go

@@ -6,23 +6,22 @@ functionality for running graphical user interfaces.
 
 See https://gioui.org for instructions to set up and run Gio programs.
 
-Windows
+# Windows
 
-Create a new Window by calling NewWindow. On mobile platforms or when Gio
-is embedded in another project, NewWindow merely connects with a previously
-created window.
+A Window is run by calling its Event method in a loop. The first time a
+method on Window is called, a new GUI window is created and shown. On mobile
+platforms or when Gio is embedded in another project, Window merely connects
+with a previously created GUI window.
 
-A Window is run by receiving events from its Events channel. The most
-important event is FrameEvent that prompts an update of the window
-contents and state.
+The most important event is [FrameEvent] that prompts an update of the window
+contents.
 
 For example:
 
-	import "gioui.org/unit"
-
-	w := app.NewWindow()
-	for e := range w.Events() {
-		if e, ok := e.(system.FrameEvent); ok {
+	w := new(app.Window)
+	for {
+		e := w.Event()
+		if e, ok := e.(app.FrameEvent); ok {
 			ops.Reset()
 			// Add operations to ops.
 			...
@@ -32,9 +31,9 @@ For example:
 	}
 
 A program must keep receiving events from the event channel until
-DestroyEvent is received.
+[DestroyEvent] is received.
 
-Main
+# Main
 
 The Main function must be called from a program's main function, to hand over
 control of the main thread to operating systems that need it.
@@ -50,20 +49,14 @@ For example, to display a blank but otherwise functional window:
 	func main() {
 		go func() {
 			w := app.NewWindow()
-			for range w.Events() {
+			for {
+				w.Event()
 			}
 		}()
 		app.Main()
 	}
 
-
-Event queue
-
-A FrameEvent's Queue method returns an event.Queue implementation that distributes
-incoming events to the event handlers declared in the last frame.
-See the gioui.org/io/event package for more information about event handlers.
-
-Permissions
+# Permissions
 
 The packages under gioui.org/app/permission should be imported
 by a Gio program or by one of its dependencies to indicate that specific

app/egl_android.go

@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
+//go:build !noopengl
+
 package app
 
 /*
@@ -15,9 +17,8 @@ import (
 )
 
 type androidContext struct {
-	win           *window
-	eglSurf       egl.NativeWindowType
-	width, height int
+	win     *window
+	eglSurf egl.NativeWindowType
 	*egl.Context
 }
 
@@ -43,9 +44,8 @@ func (c *androidContext) Refresh() error {
 	if err := c.win.setVisual(c.Context.VisualID()); err != nil {
 		return err
 	}
-	win, width, height := c.win.nativeWindow()
+	win, _, _ := c.win.nativeWindow()
 	c.eglSurf = egl.NativeWindowType(unsafe.Pointer(win))
-	c.width, c.height = width, height
 	return nil
 }
 
@@ -53,7 +53,7 @@ func (c *androidContext) Lock() error {
 	// The Android emulator creates a broken surface if it is not
 	// created on the same thread as the context is made current.
 	if c.eglSurf != nil {
-		if err := c.Context.CreateSurface(c.eglSurf, c.width, c.height); err != nil {
+		if err := c.Context.CreateSurface(c.eglSurf); err != nil {
 			return err
 		}
 		c.eglSurf = nil

app/egl_wayland.go

@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-//go:build ((linux && !android) || freebsd) && !nowayland
+//go:build ((linux && !android) || freebsd) && !nowayland && !noopengl
 // +build linux,!android freebsd
 // +build !nowayland
+// +build !noopengl
 
 package app
 
@@ -68,7 +69,17 @@ func (c *wlContext) Refresh() error {
 	}
 	c.eglWin = eglWin
 	eglSurf := egl.NativeWindowType(uintptr(unsafe.Pointer(eglWin)))
-	return c.Context.CreateSurface(eglSurf, width, height)
+	if err := c.Context.CreateSurface(eglSurf); err != nil {
+		return err
+	}
+	if err := c.Context.MakeCurrent(); err != nil {
+		return err
+	}
+	defer c.Context.ReleaseCurrent()
+	// We're in charge of the frame callbacks, don't let eglSwapBuffers
+	// wait for callbacks that may never arrive.
+	c.Context.EnableVSync(false)
+	return nil
 }
 
 func (c *wlContext) Lock() error {

app/egl_windows.go

@@ -1,10 +1,10 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
+//go:build !noopengl
+
 package app
 
 import (
-	"golang.org/x/sys/windows"
-
 	"gioui.org/internal/egl"
 )
 
@@ -22,6 +22,18 @@ func init() {
 			if err != nil {
 				return nil, err
 			}
+			win, _, _ := w.HWND()
+			eglSurf := egl.NativeWindowType(win)
+			if err := ctx.CreateSurface(eglSurf); err != nil {
+				ctx.Release()
+				return nil, err
+			}
+			if err := ctx.MakeCurrent(); err != nil {
+				ctx.Release()
+				return nil, err
+			}
+			defer ctx.ReleaseCurrent()
+			ctx.EnableVSync(true)
 			return &glContext{win: w, Context: ctx}, nil
 		},
 	})
@@ -35,21 +47,6 @@ func (c *glContext) Release() {
 }
 
 func (c *glContext) Refresh() error {
-	c.Context.ReleaseSurface()
-	var (
-		win           windows.Handle
-		width, height int
-	)
-	win, width, height = c.win.HWND()
-	eglSurf := egl.NativeWindowType(win)
-	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
-		return err
-	}
-	if err := c.Context.MakeCurrent(); err != nil {
-		return err
-	}
-	c.Context.EnableVSync(true)
-	c.Context.ReleaseCurrent()
 	return nil
 }
 

app/egl_x11.go

@@ -1,8 +1,9 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-//go:build ((linux && !android) || freebsd || openbsd) && !nox11
+//go:build ((linux && !android) || freebsd || openbsd) && !nox11 && !noopengl
 // +build linux,!android freebsd openbsd
 // +build !nox11
+// +build !noopengl
 
 package app
 
@@ -24,6 +25,18 @@ func init() {
 		if err != nil {
 			return nil, err
 		}
+		win, _, _ := w.window()
+		eglSurf := egl.NativeWindowType(uintptr(win))
+		if err := ctx.CreateSurface(eglSurf); err != nil {
+			ctx.Release()
+			return nil, err
+		}
+		if err := ctx.MakeCurrent(); err != nil {
+			ctx.Release()
+			return nil, err
+		}
+		defer ctx.ReleaseCurrent()
+		ctx.EnableVSync(true)
 		return &x11Context{win: w, Context: ctx}, nil
 	}
 }
@@ -36,17 +49,6 @@ func (c *x11Context) Release() {
 }
 
 func (c *x11Context) Refresh() error {
-	c.Context.ReleaseSurface()
-	win, width, height := c.win.window()
-	eglSurf := egl.NativeWindowType(uintptr(win))
-	if err := c.Context.CreateSurface(eglSurf, width, height); err != nil {
-		return err
-	}
-	if err := c.Context.MakeCurrent(); err != nil {
-		return err
-	}
-	c.Context.EnableVSync(true)
-	c.Context.ReleaseCurrent()
 	return nil
 }
 

app/gl_js.go

@@ -13,6 +13,7 @@ import (
 type glContext struct {
 	ctx js.Value
 	cnv js.Value
+	w   *window
 }
 
 func newContext(w *window) (*glContext, error) {
@@ -32,11 +33,15 @@ func newContext(w *window) (*glContext, error) {
 	c := &glContext{
 		ctx: ctx,
 		cnv: w.cnv,
+		w:   w,
 	}
 	return c, nil
 }
 
 func (c *glContext) RenderTarget() (gpu.RenderTarget, error) {
+	if c.w.contextStatus != contextStatusOkay {
+		return nil, gpu.ErrDeviceLost
+	}
 	return gpu.OpenGLRenderTarget{}, nil
 }
 
@@ -48,9 +53,6 @@ func (c *glContext) Release() {
 }
 
 func (c *glContext) Present() error {
-	if c.ctx.Call("isContextLost").Bool() {
-		return errors.New("context lost")
-	}
 	return nil
 }
 
@@ -61,7 +63,15 @@ func (c *glContext) Lock() error {
 func (c *glContext) Unlock() {}
 
 func (c *glContext) Refresh() error {
-	return nil
+	switch c.w.contextStatus {
+	case contextStatusLost:
+		return errOutOfDate
+	case contextStatusRestored:
+		c.w.contextStatus = contextStatusOkay
+		return gpu.ErrDeviceLost
+	default:
+		return nil
+	}
 }
 
 func (w *window) NewContext() (context, error) {

app/gl_macos.go

@@ -16,6 +16,9 @@ import (
 )
 
 /*
+#cgo CFLAGS: -DGL_SILENCE_DEPRECATION -xobjective-c -fobjc-arc
+#cgo LDFLAGS: -framework OpenGL
+
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreGraphics/CoreGraphics.h>
 #include <AppKit/AppKit.h>

app/gl_macos.m

@@ -2,13 +2,12 @@
 
 // +build darwin,!ios,nometal
 
-@import AppKit;
-
+#import <AppKit/AppKit.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <OpenGL/OpenGL.h>
 #include "_cgo_export.h"
 
-CALayer *gio_layerFactory(void) {
+CALayer *gio_layerFactory(BOOL presentWithTrans) {
 	@autoreleasepool {
 		return [CALayer layer];
 	}

app/ime.go

@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+package app
+
+import (
+	"unicode"
+	"unicode/utf16"
+
+	"gioui.org/io/input"
+	"gioui.org/io/key"
+)
+
+type editorState struct {
+	input.EditorState
+	compose key.Range
+}
+
+func (e *editorState) Replace(r key.Range, text string) {
+	if r.Start > r.End {
+		r.Start, r.End = r.End, r.Start
+	}
+	runes := []rune(text)
+	newEnd := r.Start + len(runes)
+	adjust := func(pos int) int {
+		switch {
+		case newEnd < pos && pos <= r.End:
+			return newEnd
+		case r.End < pos:
+			diff := newEnd - r.End
+			return pos + diff
+		}
+		return pos
+	}
+	e.Selection.Start = adjust(e.Selection.Start)
+	e.Selection.End = adjust(e.Selection.End)
+	if e.compose.Start != -1 {
+		e.compose.Start = adjust(e.compose.Start)
+		e.compose.End = adjust(e.compose.End)
+	}
+	s := e.Snippet
+	if r.End < s.Start || r.Start > s.End {
+		// Discard snippet if it doesn't overlap with replacement.
+		s = key.Snippet{
+			Range: key.Range{
+				Start: r.Start,
+				End:   r.Start,
+			},
+		}
+	}
+	var newSnippet []rune
+	snippet := []rune(s.Text)
+	// Append first part of existing snippet.
+	if end := r.Start - s.Start; end > 0 {
+		newSnippet = append(newSnippet, snippet[:end]...)
+	}
+	// Append replacement.
+	newSnippet = append(newSnippet, runes...)
+	// Append last part of existing snippet.
+	if start := r.End; start < s.End {
+		newSnippet = append(newSnippet, snippet[start-s.Start:]...)
+	}
+	// Adjust snippet range to include replacement.
+	if r.Start < s.Start {
+		s.Start = r.Start
+	}
+	s.End = s.Start + len(newSnippet)
+	s.Text = string(newSnippet)
+	e.Snippet = s
+}
+
+// UTF16Index converts the given index in runes into an index in utf16 characters.
+func (e *editorState) UTF16Index(runes int) int {
+	if runes == -1 {
+		return -1
+	}
+	if runes < e.Snippet.Start {
+		// Assume runes before sippet are one UTF-16 character each.
+		return runes
+	}
+	chars := e.Snippet.Start
+	runes -= e.Snippet.Start
+	for _, r := range e.Snippet.Text {
+		if runes == 0 {
+			break
+		}
+		runes--
+		chars++
+		if r1, _ := utf16.EncodeRune(r); r1 != unicode.ReplacementChar {
+			chars++
+		}
+	}
+	// Assume runes after snippets are one UTF-16 character each.
+	return chars + runes
+}
+
+// RunesIndex converts the given index in utf16 characters to an index in runes.
+func (e *editorState) RunesIndex(chars int) int {
+	if chars == -1 {
+		return -1
+	}
+	if chars < e.Snippet.Start {
+		// Assume runes before offset are one UTF-16 character each.
+		return chars
+	}
+	runes := e.Snippet.Start
+	chars -= e.Snippet.Start
+	for _, r := range e.Snippet.Text {
+		if chars == 0 {
+			break
+		}
+		chars--
+		runes++
+		if r1, _ := utf16.EncodeRune(r); r1 != unicode.ReplacementChar {
+			chars--
+		}
+	}
+	// Assume runes after snippets are one UTF-16 character each.
+	return runes + chars
+}

app/ime_test.go

@@ -9,9 +9,10 @@ import (
 	"testing"
 	"unicode/utf8"
 
+	"gioui.org/font"
 	"gioui.org/font/gofont"
+	"gioui.org/io/input"
 	"gioui.org/io/key"
-	"gioui.org/io/router"
 	"gioui.org/layout"
 	"gioui.org/op"
 	"gioui.org/text"
@@ -28,14 +29,14 @@ func FuzzIME(f *testing.F) {
 	f.Add([]byte("20007800002\x02000"))
 	f.Add([]byte("200A02000990\x19002\x17\x0200"))
 	f.Fuzz(func(t *testing.T, cmds []byte) {
-		cache := text.NewCache(gofont.Collection())
+		cache := text.NewShaper(text.WithCollection(gofont.Collection()))
 		e := new(widget.Editor)
-		e.Focus()
 
-		var r router.Router
-		gtx := layout.Context{Ops: new(op.Ops), Queue: &r}
+		var r input.Router
+		gtx := layout.Context{Ops: new(op.Ops), Source: r.Source()}
+		gtx.Execute(key.FocusCmd{Tag: e})
 		// Layout once to register focus.
-		e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
+		e.Layout(gtx, cache, font.Font{}, unit.Sp(10), op.CallOp{}, op.CallOp{})
 		r.Frame(gtx.Ops)
 
 		var state editorState
@@ -103,11 +104,32 @@ func FuzzIME(f *testing.F) {
 				}
 			}
 			cmds = cmds[cmdLen:]
-			e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
+			e.Layout(gtx, cache, font.Font{}, unit.Sp(10), op.CallOp{}, op.CallOp{})
 			r.Frame(gtx.Ops)
 			newState := r.EditorState()
 			// We don't track caret position.
 			state.Selection.Caret = newState.Selection.Caret
+			// Expanded snippets are ok.
+			their, our := newState.Snippet, state.EditorState.Snippet
+			beforeLen := 0
+			for before := our.Start - their.Start; before > 0; before-- {
+				_, n := utf8.DecodeRuneInString(their.Text[beforeLen:])
+				beforeLen += n
+			}
+			afterLen := 0
+			for after := their.End - our.End; after > 0; after-- {
+				_, n := utf8.DecodeLastRuneInString(their.Text[:len(their.Text)-afterLen])
+				afterLen += n
+			}
+			if beforeLen > 0 {
+				our.Text = their.Text[:beforeLen] + our.Text
+				our.Start = their.Start
+			}
+			if afterLen > 0 {
+				our.Text = our.Text + their.Text[len(their.Text)-afterLen:]
+				our.End = their.End
+			}
+			state.EditorState.Snippet = our
 			if newState != state.EditorState {
 				t.Errorf("IME state: %+v\neditor state: %+v", state.EditorState, newState)
 			}

app/internal/log/log.go

@@ -1,7 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-// Package points standard output, standard error and the standard
-// library package log to the platform logger.
-package log
-
-var appID = "gio"

app/internal/windows/windows.go

@@ -47,6 +47,13 @@ type WndClassEx struct {
 	HIconSm       syscall.Handle
 }
 
+type Margins struct {
+	CxLeftWidth    int32
+	CxRightWidth   int32
+	CyTopHeight    int32
+	CyBottomHeight int32
+}
+
 type Msg struct {
 	Hwnd     syscall.Handle
 	Message  uint32
@@ -69,6 +76,21 @@ type MinMaxInfo struct {
 	PtMaxTrackSize Point
 }
 
+type NCCalcSizeParams struct {
+	Rgrc  [3]Rect
+	LpPos *WindowPos
+}
+
+type WindowPos struct {
+	HWND            syscall.Handle
+	HWNDInsertAfter syscall.Handle
+	x               int32
+	y               int32
+	cx              int32
+	cy              int32
+	flags           uint32
+}
+
 type WindowPlacement struct {
 	length           uint32
 	flags            uint32
@@ -113,7 +135,16 @@ const (
 
 	HWND_TOPMOST = ^(uint32(1) - 1) // -1
 
-	HTCLIENT = 1
+	HTCAPTION     = 2
+	HTCLIENT      = 1
+	HTLEFT        = 10
+	HTRIGHT       = 11
+	HTTOP         = 12
+	HTTOPLEFT     = 13
+	HTTOPRIGHT    = 14
+	HTBOTTOM      = 15
+	HTBOTTOMLEFT  = 16
+	HTBOTTOMRIGHT = 17
 
 	IDC_APPSTARTING = 32650 // Standard arrow and small hourglass
 	IDC_ARROW       = 32512 // Standard arrow
@@ -146,13 +177,16 @@ const (
 
 	SCS_SETSTR = GCS_COMPREADSTR | GCS_COMPSTR
 
+	SM_CXSIZEFRAME = 32
+	SM_CYSIZEFRAME = 33
+
 	SW_SHOWDEFAULT   = 10
 	SW_SHOWMINIMIZED = 2
 	SW_SHOWMAXIMIZED = 3
 	SW_SHOWNORMAL    = 1
 	SW_SHOW          = 5
-	SWP_FRAMECHANGED = 0x0020
 
+	SWP_FRAMECHANGED  = 0x0020
 	SWP_NOMOVE        = 0x0002
 	SWP_NOOWNERZORDER = 0x0200
 	SWP_NOSIZE        = 0x0001
@@ -231,6 +265,10 @@ const (
 	WM_MOUSEMOVE            = 0x0200
 	WM_MOUSEWHEEL           = 0x020A
 	WM_MOUSEHWHEEL          = 0x020E
+	WM_NCACTIVATE           = 0x0086
+	WM_NCLBUTTONDBLCLK      = 0x00A3
+	WM_NCHITTEST            = 0x0084
+	WM_NCCALCSIZE           = 0x0083
 	WM_PAINT                = 0x000F
 	WM_QUIT                 = 0x0012
 	WM_SETCURSOR            = 0x0020
@@ -246,7 +284,7 @@ const (
 	WM_USER                 = 0x0400
 	WM_WINDOWPOSCHANGED     = 0x0047
 
-	WS_CLIPCHILDREN     = 0x00010000
+	WS_CLIPCHILDREN     = 0x02000000
 	WS_CLIPSIBLINGS     = 0x04000000
 	WS_MAXIMIZE         = 0x01000000
 	WS_ICONIC           = 0x20000000
@@ -309,6 +347,7 @@ var (
 	_DispatchMessage             = user32.NewProc("DispatchMessageW")
 	_EmptyClipboard              = user32.NewProc("EmptyClipboard")
 	_GetWindowRect               = user32.NewProc("GetWindowRect")
+	_GetClientRect               = user32.NewProc("GetClientRect")
 	_GetClipboardData            = user32.NewProc("GetClipboardData")
 	_GetDC                       = user32.NewProc("GetDC")
 	_GetDpiForWindow             = user32.NewProc("GetDpiForWindow")
@@ -316,6 +355,7 @@ var (
 	_GetMessage                  = user32.NewProc("GetMessageW")
 	_GetMessageTime              = user32.NewProc("GetMessageTime")
 	_GetMonitorInfo              = user32.NewProc("GetMonitorInfoW")
+	_GetSystemMetrics            = user32.NewProc("GetSystemMetrics")
 	_GetWindowLong               = user32.NewProc("GetWindowLongPtrW")
 	_GetWindowLong32             = user32.NewProc("GetWindowLongW")
 	_GetWindowPlacement          = user32.NewProc("GetWindowPlacement")
@@ -364,6 +404,9 @@ var (
 	_ImmReleaseContext       = imm32.NewProc("ImmReleaseContext")
 	_ImmSetCandidateWindow   = imm32.NewProc("ImmSetCandidateWindow")
 	_ImmSetCompositionWindow = imm32.NewProc("ImmSetCompositionWindow")
+
+	dwmapi                        = syscall.NewLazySystemDLL("dwmapi")
+	_DwmExtendFrameIntoClientArea = dwmapi.NewProc("DwmExtendFrameIntoClientArea")
 )
 
 func AdjustWindowRectEx(r *Rect, dwStyle uint32, bMenu int, dwExStyle uint32) {
@@ -415,6 +458,14 @@ func DispatchMessage(m *Msg) {
 	_DispatchMessage.Call(uintptr(unsafe.Pointer(m)))
 }
 
+func DwmExtendFrameIntoClientArea(hwnd syscall.Handle, margins Margins) error {
+	r, _, _ := _DwmExtendFrameIntoClientArea.Call(uintptr(hwnd), uintptr(unsafe.Pointer(&margins)))
+	if r != 0 {
+		return fmt.Errorf("DwmExtendFrameIntoClientArea: %#x", r)
+	}
+	return nil
+}
+
 func EmptyClipboard() error {
 	r, _, err := _EmptyClipboard.Call()
 	if r == 0 {
@@ -429,6 +480,12 @@ func GetWindowRect(hwnd syscall.Handle) Rect {
 	return r
 }
 
+func GetClientRect(hwnd syscall.Handle) Rect {
+	var r Rect
+	_GetClientRect.Call(uintptr(hwnd), uintptr(unsafe.Pointer(&r)))
+	return r
+}
+
 func GetClipboardData(format uint32) (syscall.Handle, error) {
 	r, _, err := _GetClipboardData.Call(uintptr(format))
 	if r == 0 {
@@ -499,6 +556,11 @@ func GetMessageTime() time.Duration {
 	return time.Duration(r) * time.Millisecond
 }
 
+func GetSystemMetrics(nIndex int) int {
+	r, _, _ := _GetSystemMetrics.Call(uintptr(nIndex))
+	return int(r)
+}
+
 // GetWindowDPI returns the effective DPI of the window.
 func GetWindowDPI(hwnd syscall.Handle) int {
 	// Check for GetDpiForWindow, introduced in Windows 10.

app/internal/xkb/xkb_unix.go

@@ -136,6 +136,10 @@ func (x *Context) LoadKeymap(format int, fd int, size int) error {
 
 func (x *Context) Modifiers() key.Modifiers {
 	var mods key.Modifiers
+	if x.state == nil {
+		return mods
+	}
+
 	if C.xkb_state_mod_name_is_active(x.state, (*C.char)(unsafe.Pointer(&_XKB_MOD_NAME_CTRL[0])), C.XKB_STATE_MODS_EFFECTIVE) == 1 {
 		mods |= key.ModCtrl
 	}
@@ -219,6 +223,9 @@ func (x *Context) charsForKeycode(keyCode C.xkb_keycode_t) []byte {
 }
 
 func (x *Context) IsRepeatKey(keyCode uint32) bool {
+	if x.state == nil {
+		return false
+	}
 	kc := C.xkb_keycode_t(keyCode)
 	return C.xkb_keymap_key_repeats(x.keyMap, kc) == 1
 }
@@ -231,14 +238,17 @@ func (x *Context) UpdateMask(depressed, latched, locked, depressedGroup, latched
 		C.xkb_layout_index_t(depressedGroup), C.xkb_layout_index_t(latchedGroup), C.xkb_layout_index_t(lockedGroup))
 }
 
-func convertKeysym(s C.xkb_keysym_t) (string, bool) {
+func convertKeysym(s C.xkb_keysym_t) (key.Name, bool) {
 	if 'a' <= s && s <= 'z' {
-		return string(rune(s - 'a' + 'A')), true
+		return key.Name(rune(s - 'a' + 'A')), true
+	}
+	if C.XKB_KEY_KP_0 <= s && s <= C.XKB_KEY_KP_9 {
+		return key.Name(rune(s - C.XKB_KEY_KP_0 + '0')), true
 	}
 	if ' ' < s && s <= '~' {
-		return string(rune(s)), true
+		return key.Name(rune(s)), true
 	}
-	var n string
+	var n key.Name
 	switch s {
 	case C.XKB_KEY_Escape:
 		n = key.NameEscape
@@ -248,8 +258,6 @@ func convertKeysym(s C.xkb_keysym_t) (string, bool) {
 		n = key.NameRightArrow
 	case C.XKB_KEY_Return:
 		n = key.NameReturn
-	case C.XKB_KEY_KP_Enter:
-		n = key.NameEnter
 	case C.XKB_KEY_Up:
 		n = key.NameUpArrow
 	case C.XKB_KEY_Down:
@@ -290,9 +298,9 @@ func convertKeysym(s C.xkb_keysym_t) (string, bool) {
 		n = key.NameF11
 	case C.XKB_KEY_F12:
 		n = key.NameF12
-	case C.XKB_KEY_Tab, C.XKB_KEY_KP_Tab, C.XKB_KEY_ISO_Left_Tab:
+	case C.XKB_KEY_Tab, C.XKB_KEY_ISO_Left_Tab:
 		n = key.NameTab
-	case 0x20, C.XKB_KEY_KP_Space:
+	case 0x20:
 		n = key.NameSpace
 	case C.XKB_KEY_Control_L, C.XKB_KEY_Control_R:
 		n = key.NameCtrl
@@ -302,6 +310,64 @@ func convertKeysym(s C.xkb_keysym_t) (string, bool) {
 		n = key.NameAlt
 	case C.XKB_KEY_Super_L, C.XKB_KEY_Super_R:
 		n = key.NameSuper
+
+	case C.XKB_KEY_KP_Space:
+		n = key.NameSpace
+	case C.XKB_KEY_KP_Tab:
+		n = key.NameTab
+	case C.XKB_KEY_KP_Enter:
+		n = key.NameEnter
+	case C.XKB_KEY_KP_F1:
+		n = key.NameF1
+	case C.XKB_KEY_KP_F2:
+		n = key.NameF2
+	case C.XKB_KEY_KP_F3:
+		n = key.NameF3
+	case C.XKB_KEY_KP_F4:
+		n = key.NameF4
+	case C.XKB_KEY_KP_Home:
+		n = key.NameHome
+	case C.XKB_KEY_KP_Left:
+		n = key.NameLeftArrow
+	case C.XKB_KEY_KP_Up:
+		n = key.NameUpArrow
+	case C.XKB_KEY_KP_Right:
+		n = key.NameRightArrow
+	case C.XKB_KEY_KP_Down:
+		n = key.NameDownArrow
+	case C.XKB_KEY_KP_Prior:
+		// not supported
+		return "", false
+	case C.XKB_KEY_KP_Next:
+		// not supported
+		return "", false
+	case C.XKB_KEY_KP_End:
+		n = key.NameEnd
+	case C.XKB_KEY_KP_Begin:
+		n = key.NameHome
+	case C.XKB_KEY_KP_Insert:
+		// not supported
+		return "", false
+	case C.XKB_KEY_KP_Delete:
+		n = key.NameDeleteForward
+	case C.XKB_KEY_KP_Multiply:
+		n = "*"
+	case C.XKB_KEY_KP_Add:
+		n = "+"
+	case C.XKB_KEY_KP_Separator:
+		// not supported
+		return "", false
+	case C.XKB_KEY_KP_Subtract:
+		n = "-"
+	case C.XKB_KEY_KP_Decimal:
+		// TODO(dh): does a German keyboard layout also translate the numpad key to XKB_KEY_KP_DECIMAL? Because in
+		// German, the decimal is a comma, not a period.
+		n = "."
+	case C.XKB_KEY_KP_Divide:
+		n = "/"
+	case C.XKB_KEY_KP_Equal:
+		n = "="
+
 	default:
 		return "", false
 	}

app/log_android.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package log
+package app
 
 /*
 #cgo LDFLAGS: -llog
@@ -22,7 +22,7 @@ import (
 // 1024 is the truncation limit from android/log.h, plus a \n.
 const logLineLimit = 1024
 
-var logTag = C.CString(appID)
+var logTag = C.CString(ID)
 
 func init() {
 	// Android's logcat already includes timestamps.

app/log_ios.go

@@ -3,7 +3,7 @@
 //go:build darwin && ios
 // +build darwin,ios
 
-package log
+package app
 
 /*
 #cgo CFLAGS: -Werror -fmodules -fobjc-arc -x objective-c

app/log_windows.go

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-package log
+package app
 
 import (
 	"log"

app/metal_darwin.go

@@ -12,10 +12,11 @@ import (
 )
 
 /*
-#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
+#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
+#cgo LDFLAGS: -framework QuartzCore -framework Metal
 
-@import Metal;
-@import QuartzCore.CAMetalLayer;
+#import <Metal/Metal.h>
+#import <QuartzCore/CAMetalLayer.h>
 
 #include <CoreFoundation/CoreFoundation.h>
 
@@ -59,8 +60,9 @@ static void presentDrawable(CFTypeRef queueRef, CFTypeRef drawableRef) {
 		id<MTLDrawable> drawable = (__bridge id<MTLDrawable>)drawableRef;
 		id<MTLCommandQueue> queue = (__bridge id<MTLCommandQueue>)queueRef;
 		id<MTLCommandBuffer> cmdBuffer = [queue commandBuffer];
-		[cmdBuffer presentDrawable:drawable];
 		[cmdBuffer commit];
+		[cmdBuffer waitUntilScheduled];
+		[drawable present];
 	}
 }
 

app/metal_ios.go

@@ -21,7 +21,10 @@ Class gio_layerClass(void) {
 static CFTypeRef getMetalLayer(CFTypeRef viewRef) {
 	@autoreleasepool {
 		UIView *view = (__bridge UIView *)viewRef;
-		return CFBridgingRetain(view.layer);
+		CAMetalLayer *l = (CAMetalLayer *)view.layer;
+		l.needsDisplayOnBoundsChange = YES;
+		l.presentsWithTransaction = YES;
+		return CFBridgingRetain(l);
 	}
 }
 

app/metal_macos.go

@@ -6,17 +6,19 @@
 package app
 
 /*
-#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
-
-@import AppKit;
-
-@import QuartzCore.CAMetalLayer;
+#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
 
+#import <AppKit/AppKit.h>
+#import <QuartzCore/CAMetalLayer.h>
 #include <CoreFoundation/CoreFoundation.h>
 
-CALayer *gio_layerFactory(void) {
+CALayer *gio_layerFactory(BOOL presentWithTrans) {
 	@autoreleasepool {
-		return [CAMetalLayer layer];
+		CAMetalLayer *l = [CAMetalLayer layer];
+		l.autoresizingMask = kCALayerHeightSizable|kCALayerWidthSizable;
+		l.needsDisplayOnBoundsChange = YES;
+		l.presentsWithTransaction = presentWithTrans;
+		return l;
 	}
 }
 

app/os.go

@@ -7,7 +7,9 @@ import (
 	"image"
 	"image/color"
 
+	"gioui.org/io/event"
 	"gioui.org/io/key"
+	"gioui.org/op"
 
 	"gioui.org/gpu"
 	"gioui.org/io/pointer"
@@ -41,10 +43,13 @@ type Config struct {
 	// CustomRenderer is true when the window content is rendered by the
 	// client.
 	CustomRenderer bool
-	// center is a flag used to center the window. Set by option.
-	center bool
 	// Decorated reports whether window decorations are provided automatically.
 	Decorated bool
+	// Focused reports whether has the keyboard focus.
+	Focused bool
+	// decoHeight is the height of the fallback decoration for platforms such
+	// as Wayland that may need fallback client-side decorations.
+	decoHeight unit.Dp
 }
 
 // ConfigEvent is sent whenever the configuration of a Window changes.
@@ -130,8 +135,30 @@ func (o Orientation) String() string {
 	return ""
 }
 
+// eventLoop implements the functionality required for drivers where
+// window event loops must run on a separate thread.
+type eventLoop struct {
+	win *callbacks
+	// wakeup is the callback to wake up the event loop.
+	wakeup func()
+	// driverFuncs is a channel of functions to run the next
+	// time the window loop waits for events.
+	driverFuncs chan func()
+	// invalidates is notified when an invalidate is requested by the client.
+	invalidates chan struct{}
+	// immediateInvalidates is an optimistic invalidates that doesn't require a wakeup.
+	immediateInvalidates chan struct{}
+	// events is where the platform backend delivers events bound for the
+	// user program.
+	events   chan event.Event
+	frames   chan *op.Ops
+	frameAck chan struct{}
+	// delivering avoids re-entrant event delivery.
+	delivering bool
+}
+
 type frameEvent struct {
-	system.FrameEvent
+	FrameEvent
 
 	Sync bool
 }
@@ -146,9 +173,13 @@ type context interface {
 	Unlock()
 }
 
-// Driver is the interface for the platform implementation
+// driver is the interface for the platform implementation
 // of a window.
 type driver interface {
+	// Event blocks until an event is available and returns it.
+	Event() event.Event
+	// Invalidate requests a FrameEvent.
+	Invalidate()
 	// SetAnimating sets the animation flag. When the window is animating,
 	// FrameEvents are delivered as fast as the display can handle them.
 	SetAnimating(anim bool)
@@ -159,27 +190,29 @@ type driver interface {
 	// ReadClipboard requests the clipboard content.
 	ReadClipboard()
 	// WriteClipboard requests a clipboard write.
-	WriteClipboard(s string)
+	WriteClipboard(mime string, s []byte)
 	// Configure the window.
 	Configure([]Option)
 	// SetCursor updates the current cursor to name.
 	SetCursor(cursor pointer.Cursor)
-	// Raise the window at the top.
-	Raise()
-	// Close the window.
-	Close()
 	// Wakeup wakes up the event loop and sends a WakeupEvent.
-	Wakeup()
+	// Wakeup()
 	// Perform actions on the window.
 	Perform(system.Action)
 	// EditorStateChanged notifies the driver that the editor state changed.
 	EditorStateChanged(old, new editorState)
+	// Run a function on the window thread.
+	Run(f func())
+	// Frame receives a frame.
+	Frame(frame *op.Ops)
+	// ProcessEvent processes an event.
+	ProcessEvent(e event.Event)
 }
 
 type windowRendezvous struct {
-	in   chan windowAndConfig
-	out  chan windowAndConfig
-	errs chan error
+	in      chan windowAndConfig
+	out     chan windowAndConfig
+	windows chan struct{}
 }
 
 type windowAndConfig struct {
@@ -189,32 +222,137 @@ type windowAndConfig struct {
 
 func newWindowRendezvous() *windowRendezvous {
 	wr := &windowRendezvous{
-		in:   make(chan windowAndConfig),
-		out:  make(chan windowAndConfig),
-		errs: make(chan error),
+		in:      make(chan windowAndConfig),
+		out:     make(chan windowAndConfig),
+		windows: make(chan struct{}),
 	}
 	go func() {
-		var main windowAndConfig
+		in := wr.in
+		var window windowAndConfig
 		var out chan windowAndConfig
 		for {
 			select {
-			case w := <-wr.in:
-				var err error
-				if main.window != nil {
-					err = errors.New("multiple windows are not supported")
-				}
-				wr.errs <- err
-				main = w
+			case w := <-in:
+				window = w
 				out = wr.out
-			case out <- main:
+			case out <- window:
 			}
 		}
 	}()
 	return wr
 }
 
-func (wakeupEvent) ImplementsEvent() {}
-func (ConfigEvent) ImplementsEvent() {}
+func newEventLoop(w *callbacks, wakeup func()) *eventLoop {
+	return &eventLoop{
+		win:                  w,
+		wakeup:               wakeup,
+		events:               make(chan event.Event),
+		invalidates:          make(chan struct{}, 1),
+		immediateInvalidates: make(chan struct{}),
+		frames:               make(chan *op.Ops),
+		frameAck:             make(chan struct{}),
+		driverFuncs:          make(chan func(), 1),
+	}
+}
+
+// Frame receives a frame and waits for its processing. It is called by
+// the client goroutine.
+func (e *eventLoop) Frame(frame *op.Ops) {
+	e.frames <- frame
+	<-e.frameAck
+}
+
+// Event returns the next available event. It is called by the client
+// goroutine.
+func (e *eventLoop) Event() event.Event {
+	for {
+		evt := <-e.events
+		// Receiving a flushEvent indicates to the platform backend that
+		// all previous events have been processed by the user program.
+		if _, ok := evt.(flushEvent); ok {
+			continue
+		}
+		return evt
+	}
+}
+
+// Invalidate requests invalidation of the window. It is called by the client
+// goroutine.
+func (e *eventLoop) Invalidate() {
+	select {
+	case e.immediateInvalidates <- struct{}{}:
+		// The event loop was waiting, no need for a wakeup.
+	case e.invalidates <- struct{}{}:
+		// The event loop is sleeping, wake it up.
+		e.wakeup()
+	default:
+		// A redraw is pending.
+	}
+}
+
+// Run f in the window loop thread. It is called by the client goroutine.
+func (e *eventLoop) Run(f func()) {
+	e.driverFuncs <- f
+	e.wakeup()
+}
+
+// FlushEvents delivers pending events to the client.
+func (e *eventLoop) FlushEvents() {
+	if e.delivering {
+		return
+	}
+	e.delivering = true
+	defer func() { e.delivering = false }()
+	for {
+		evt, ok := e.win.nextEvent()
+		if !ok {
+			break
+		}
+		e.deliverEvent(evt)
+	}
+}
+
+func (e *eventLoop) deliverEvent(evt event.Event) {
+	var frames <-chan *op.Ops
+	for {
+		select {
+		case f := <-e.driverFuncs:
+			f()
+		case frame := <-frames:
+			// The client called FrameEvent.Frame.
+			frames = nil
+			e.win.ProcessFrame(frame, e.frameAck)
+		case e.events <- evt:
+			switch evt.(type) {
+			case flushEvent, DestroyEvent:
+				// DestroyEvents are not flushed.
+				return
+			case FrameEvent:
+				frames = e.frames
+			}
+			evt = theFlushEvent
+		case <-e.invalidates:
+			e.win.Invalidate()
+		case <-e.immediateInvalidates:
+			e.win.Invalidate()
+		}
+	}
+}
+
+func (e *eventLoop) Wakeup() {
+	for {
+		select {
+		case f := <-e.driverFuncs:
+			f()
+		case <-e.invalidates:
+			e.win.Invalidate()
+		case <-e.immediateInvalidates:
+			e.win.Invalidate()
+		default:
+			return
+		}
+	}
+}
 
 func walkActions(actions system.Action, do func(system.Action)) {
 	for a := system.Action(1); actions != 0; a <<= 1 {
@@ -224,3 +362,6 @@ func walkActions(actions system.Action, do func(system.Action)) {
 		}
 	}
 }
+
+func (wakeupEvent) ImplementsEvent() {}
+func (ConfigEvent) ImplementsEvent() {}

app/os_android.go

@@ -123,51 +123,57 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	"io"
 	"math"
 	"os"
 	"path/filepath"
 	"runtime"
 	"runtime/cgo"
 	"runtime/debug"
+	"strings"
 	"sync"
 	"time"
 	"unicode/utf16"
 	"unsafe"
 
 	"gioui.org/internal/f32color"
+	"gioui.org/op"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
+	"gioui.org/io/event"
+	"gioui.org/io/input"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
-	"gioui.org/io/router"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
 type window struct {
 	callbacks *callbacks
+	loop      *eventLoop
 
 	view   C.jobject
 	handle cgo.Handle
 
 	dpi       int
 	fontScale float32
-	insets    system.Insets
+	insets    pixelInsets
 
-	stage     system.Stage
+	visible   bool
 	started   bool
 	animating bool
 
-	win    *C.ANativeWindow
-	config Config
+	win       *C.ANativeWindow
+	config    Config
+	inputHint key.InputHint
 
 	semantic struct {
-		hoverID router.SemanticID
-		rootID  router.SemanticID
-		focusID router.SemanticID
-		diffs   []router.SemanticID
+		hoverID input.SemanticID
+		rootID  input.SemanticID
+		focusID input.SemanticID
+		diffs   []input.SemanticID
 	}
 }
 
@@ -195,9 +201,13 @@ var gioView struct {
 	updateCaret        C.jmethodID
 }
 
-// ViewEvent is sent whenever the Window's underlying Android view
+type pixelInsets struct {
+	top, bottom, left, right int
+}
+
+// AndroidViewEvent is sent whenever the Window's underlying Android view
 // changes.
-type ViewEvent struct {
+type AndroidViewEvent struct {
 	// View is a JNI global reference to the android.view.View
 	// instance backing the Window. The reference is valid until
 	// the next ViewEvent is received.
@@ -310,7 +320,7 @@ const (
 )
 
 func (w *window) NewContext() (context, error) {
-	funcs := []func(w *window) (context, error){newAndroidVulkanContext, newAndroidGLESContext}
+	funcs := []func(w *window) (context, error){newAndroidGLESContext, newAndroidVulkanContext}
 	var firstErr error
 	for _, f := range funcs {
 		if f == nil {
@@ -334,20 +344,6 @@ func (w *window) NewContext() (context, error) {
 func dataDir() (string, error) {
 	dataDirOnce.Do(func() {
 		dataPath = <-dataDirChan
-		// Set XDG_CACHE_HOME to make os.UserCacheDir work.
-		if _, exists := os.LookupEnv("XDG_CACHE_HOME"); !exists {
-			cachePath := filepath.Join(dataPath, "cache")
-			os.Setenv("XDG_CACHE_HOME", cachePath)
-		}
-		// Set XDG_CONFIG_HOME to make os.UserConfigDir work.
-		if _, exists := os.LookupEnv("XDG_CONFIG_HOME"); !exists {
-			cfgPath := filepath.Join(dataPath, "config")
-			os.Setenv("XDG_CONFIG_HOME", cfgPath)
-		}
-		// Set HOME to make os.UserHomeDir work.
-		if _, exists := os.LookupEnv("HOME"); !exists {
-			os.Setenv("HOME", dataPath)
-		}
 	})
 	return dataPath, nil
 }
@@ -385,6 +381,22 @@ func Java_org_gioui_Gio_runGoMain(env *C.JNIEnv, class C.jclass, jdataDir C.jbyt
 	}
 	n := C.jni_GetArrayLength(env, jdataDir)
 	dataDir := C.GoStringN((*C.char)(unsafe.Pointer(dirBytes)), n)
+
+	// Set XDG_CACHE_HOME to make os.UserCacheDir work.
+	if _, exists := os.LookupEnv("XDG_CACHE_HOME"); !exists {
+		cachePath := filepath.Join(dataDir, "cache")
+		os.Setenv("XDG_CACHE_HOME", cachePath)
+	}
+	// Set XDG_CONFIG_HOME to make os.UserConfigDir work.
+	if _, exists := os.LookupEnv("XDG_CONFIG_HOME"); !exists {
+		cfgPath := filepath.Join(dataDir, "config")
+		os.Setenv("XDG_CONFIG_HOME", cfgPath)
+	}
+	// Set HOME to make os.UserHomeDir work.
+	if _, exists := os.LookupEnv("HOME"); !exists {
+		os.Setenv("HOME", dataDir)
+	}
+
 	dataDirChan <- dataDir
 	C.jni_ReleaseByteArrayElements(env, jdataDir, dirBytes)
 
@@ -479,24 +491,30 @@ func Java_org_gioui_GioView_onCreateView(env *C.JNIEnv, class C.jclass, view C.j
 	})
 	view = C.jni_NewGlobalRef(env, view)
 	wopts := <-mainWindow.out
+	var cnf Config
 	w, ok := windows[wopts.window]
 	if !ok {
 		w = &window{
 			callbacks: wopts.window,
 		}
+		w.loop = newEventLoop(w.callbacks, w.wakeup)
+		w.callbacks.SetDriver(w)
+		cnf.apply(unit.Metric{}, wopts.options)
 		windows[wopts.window] = w
+	} else {
+		cnf = w.config
 	}
+	mainWindow.windows <- struct{}{}
 	if w.view != 0 {
 		w.detach(env)
 	}
 	w.view = view
+	w.visible = false
 	w.handle = cgo.NewHandle(w)
-	w.callbacks.SetDriver(w)
 	w.loadConfig(env, class)
-	w.Configure(wopts.options)
-	w.SetInputHint(key.HintAny)
-	w.setStage(system.StagePaused)
-	w.callbacks.Event(ViewEvent{View: uintptr(view)})
+	w.setConfig(env, cnf)
+	w.SetInputHint(w.inputHint)
+	w.processEvent(AndroidViewEvent{View: uintptr(view)})
 	return C.jlong(w.handle)
 }
 
@@ -510,7 +528,7 @@ func Java_org_gioui_GioView_onDestroyView(env *C.JNIEnv, class C.jclass, handle
 func Java_org_gioui_GioView_onStopView(env *C.JNIEnv, class C.jclass, handle C.jlong) {
 	w := cgo.Handle(handle).Value().(*window)
 	w.started = false
-	w.setStage(system.StagePaused)
+	w.visible = false
 }
 
 //export Java_org_gioui_GioView_onStartView
@@ -526,7 +544,7 @@ func Java_org_gioui_GioView_onStartView(env *C.JNIEnv, class C.jclass, handle C.
 func Java_org_gioui_GioView_onSurfaceDestroyed(env *C.JNIEnv, class C.jclass, handle C.jlong) {
 	w := cgo.Handle(handle).Value().(*window)
 	w.win = nil
-	w.setStage(system.StagePaused)
+	w.visible = false
 }
 
 //export Java_org_gioui_GioView_onSurfaceChanged
@@ -548,9 +566,7 @@ func Java_org_gioui_GioView_onLowMemory(env *C.JNIEnv, class C.jclass) {
 func Java_org_gioui_GioView_onConfigurationChanged(env *C.JNIEnv, class C.jclass, view C.jlong) {
 	w := cgo.Handle(view).Value().(*window)
 	w.loadConfig(env, class)
-	if w.stage >= system.StageRunning {
-		w.draw(env, true)
-	}
+	w.draw(env, true)
 }
 
 //export Java_org_gioui_GioView_onFrameCallback
@@ -559,10 +575,7 @@ func Java_org_gioui_GioView_onFrameCallback(env *C.JNIEnv, class C.jclass, view
 	if !exist {
 		return
 	}
-	if w.stage < system.StageRunning {
-		return
-	}
-	if w.animating {
+	if w.visible && w.animating {
 		w.draw(env, false)
 		callVoidMethod(env, w.view, gioView.postFrameCallback)
 	}
@@ -571,9 +584,7 @@ func Java_org_gioui_GioView_onFrameCallback(env *C.JNIEnv, class C.jclass, view
 //export Java_org_gioui_GioView_onBack
 func Java_org_gioui_GioView_onBack(env *C.JNIEnv, class C.jclass, view C.jlong) C.jboolean {
 	w := cgo.Handle(view).Value().(*window)
-	ev := &system.CommandEvent{Type: system.CommandBack}
-	w.callbacks.Event(ev)
-	if ev.Cancel {
+	if w.processEvent(key.Event{Name: key.NameBack}) {
 		return C.JNI_TRUE
 	}
 	return C.JNI_FALSE
@@ -582,21 +593,20 @@ func Java_org_gioui_GioView_onBack(env *C.JNIEnv, class C.jclass, view C.jlong)
 //export Java_org_gioui_GioView_onFocusChange
 func Java_org_gioui_GioView_onFocusChange(env *C.JNIEnv, class C.jclass, view C.jlong, focus C.jboolean) {
 	w := cgo.Handle(view).Value().(*window)
-	w.callbacks.Event(key.FocusEvent{Focus: focus == C.JNI_TRUE})
+	w.config.Focused = focus == C.JNI_TRUE
+	w.processEvent(ConfigEvent{Config: w.config})
 }
 
 //export Java_org_gioui_GioView_onWindowInsets
 func Java_org_gioui_GioView_onWindowInsets(env *C.JNIEnv, class C.jclass, view C.jlong, top, right, bottom, left C.jint) {
 	w := cgo.Handle(view).Value().(*window)
-	w.insets = system.Insets{
-		Top:    unit.Px(float32(top)),
-		Bottom: unit.Px(float32(bottom)),
-		Left:   unit.Px(float32(left)),
-		Right:  unit.Px(float32(right)),
-	}
-	if w.stage >= system.StageRunning {
-		w.draw(env, true)
+	w.insets = pixelInsets{
+		top:    int(top),
+		bottom: int(bottom),
+		left:   int(left),
+		right:  int(right),
 	}
+	w.draw(env, true)
 }
 
 //export Java_org_gioui_GioView_initializeAccessibilityNodeInfo
@@ -657,7 +667,35 @@ func Java_org_gioui_GioView_onClearA11yFocus(env *C.JNIEnv, class C.jclass, view
 	}
 }
 
-func (w *window) initAccessibilityNodeInfo(env *C.JNIEnv, sem router.SemanticNode, off image.Point, info C.jobject) error {
+func (w *window) ProcessEvent(e event.Event) {
+	w.processEvent(e)
+}
+
+func (w *window) processEvent(e event.Event) bool {
+	if !w.callbacks.ProcessEvent(e) {
+		return false
+	}
+	w.loop.FlushEvents()
+	return true
+}
+
+func (w *window) Event() event.Event {
+	return w.loop.Event()
+}
+
+func (w *window) Invalidate() {
+	w.loop.Invalidate()
+}
+
+func (w *window) Run(f func()) {
+	w.loop.Run(f)
+}
+
+func (w *window) Frame(frame *op.Ops) {
+	w.loop.Frame(frame)
+}
+
+func (w *window) initAccessibilityNodeInfo(env *C.JNIEnv, sem input.SemanticNode, off image.Point, info C.jobject) error {
 	for _, ch := range sem.Children {
 		err := callVoidMethod(env, info, android.accessibilityNodeInfo.addChild, jvalue(w.view), jvalue(w.virtualIDFor(ch.ID)))
 		if err != nil {
@@ -700,7 +738,7 @@ func (w *window) initAccessibilityNodeInfo(env *C.JNIEnv, sem router.SemanticNod
 			panic(err)
 		}
 	}
-	if d.Gestures&router.ClickGesture != 0 {
+	if d.Gestures&input.ClickGesture != 0 {
 		addAction(ACTION_CLICK)
 	}
 	clsName := android.strings.androidViewView
@@ -745,25 +783,23 @@ func (w *window) initAccessibilityNodeInfo(env *C.JNIEnv, sem router.SemanticNod
 	return nil
 }
 
-func (w *window) virtualIDFor(id router.SemanticID) C.jint {
-	// TODO: Android virtual IDs are 32-bit Java integers, but childID is a int64.
+func (w *window) virtualIDFor(id input.SemanticID) C.jint {
 	if id == w.semantic.rootID {
 		return HOST_VIEW_ID
 	}
 	return C.jint(id)
 }
 
-func (w *window) semIDFor(virtID C.jint) router.SemanticID {
+func (w *window) semIDFor(virtID C.jint) input.SemanticID {
 	if virtID == HOST_VIEW_ID {
 		return w.semantic.rootID
 	}
-	return router.SemanticID(virtID)
+	return input.SemanticID(virtID)
 }
 
 func (w *window) detach(env *C.JNIEnv) {
 	callVoidMethod(env, w.view, gioView.unregister)
-	w.callbacks.Event(ViewEvent{})
-	w.callbacks.SetDriver(nil)
+	w.processEvent(AndroidViewEvent{})
 	w.handle.Delete()
 	C.jni_DeleteGlobalRef(env, w.view)
 	w.view = 0
@@ -774,18 +810,10 @@ func (w *window) setVisible(env *C.JNIEnv) {
 	if width == 0 || height == 0 {
 		return
 	}
-	w.setStage(system.StageRunning)
+	w.visible = true
 	w.draw(env, true)
 }
 
-func (w *window) setStage(stage system.Stage) {
-	if stage == w.stage {
-		return
-	}
-	w.stage = stage
-	w.callbacks.Event(system.StageEvent{stage})
-}
-
 func (w *window) setVisual(visID int) error {
 	if C.ANativeWindow_setBuffersGeometry(w.win, 0, 0, C.int32_t(visID)) != 0 {
 		return errors.New("ANativeWindow_setBuffersGeometry failed")
@@ -822,21 +850,31 @@ func (w *window) SetAnimating(anim bool) {
 }
 
 func (w *window) draw(env *C.JNIEnv, sync bool) {
+	if !w.visible {
+		return
+	}
 	size := image.Pt(int(C.ANativeWindow_getWidth(w.win)), int(C.ANativeWindow_getHeight(w.win)))
 	if size != w.config.Size {
 		w.config.Size = size
-		w.callbacks.Event(ConfigEvent{Config: w.config})
+		w.processEvent(ConfigEvent{Config: w.config})
 	}
 	if size.X == 0 || size.Y == 0 {
 		return
 	}
 	const inchPrDp = 1.0 / 160
 	ppdp := float32(w.dpi) * inchPrDp
-	w.callbacks.Event(frameEvent{
-		FrameEvent: system.FrameEvent{
+	dppp := unit.Dp(1.0 / ppdp)
+	insets := Insets{
+		Top:    unit.Dp(w.insets.top) * dppp,
+		Bottom: unit.Dp(w.insets.bottom) * dppp,
+		Left:   unit.Dp(w.insets.left) * dppp,
+		Right:  unit.Dp(w.insets.right) * dppp,
+	}
+	w.processEvent(frameEvent{
+		FrameEvent: FrameEvent{
 			Now:    time.Now(),
 			Size:   w.config.Size,
-			Insets: w.insets,
+			Insets: insets,
 			Metric: unit.Metric{
 				PxPerDp: ppdp,
 				PxPerSp: w.fontScale * ppdp,
@@ -867,8 +905,6 @@ func (w *window) draw(env *C.JNIEnv, sync bool) {
 	}
 }
 
-type keyMapper func(devId, keyCode C.int32_t) rune
-
 func runInJVM(jvm *C.JavaVM, f func(env *C.JNIEnv)) {
 	if jvm == nil {
 		panic("nil JVM")
@@ -889,8 +925,8 @@ func runInJVM(jvm *C.JavaVM, f func(env *C.JNIEnv)) {
 	f(env)
 }
 
-func convertKeyCode(code C.jint) (string, bool) {
-	var n string
+func convertKeyCode(code C.jint) (key.Name, bool) {
+	var n key.Name
 	switch code {
 	case C.AKEYCODE_FORWARD_DEL:
 		n = key.NameDeleteForward
@@ -908,6 +944,14 @@ func convertKeyCode(code C.jint) (string, bool) {
 		n = key.NameAlt
 	case C.AKEYCODE_META_LEFT, C.AKEYCODE_META_RIGHT:
 		n = key.NameSuper
+	case C.AKEYCODE_DPAD_UP:
+		n = key.NameUpArrow
+	case C.AKEYCODE_DPAD_DOWN:
+		n = key.NameDownArrow
+	case C.AKEYCODE_DPAD_LEFT:
+		n = key.NameLeftArrow
+	case C.AKEYCODE_DPAD_RIGHT:
+		n = key.NameRightArrow
 	default:
 		return "", false
 	}
@@ -917,26 +961,16 @@ func convertKeyCode(code C.jint) (string, bool) {
 //export Java_org_gioui_GioView_onKeyEvent
 func Java_org_gioui_GioView_onKeyEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, keyCode, r C.jint, pressed C.jboolean, t C.jlong) {
 	w := cgo.Handle(handle).Value().(*window)
-	if pressed == C.JNI_TRUE {
-		switch keyCode {
-		case C.AKEYCODE_DPAD_UP:
-			w.callbacks.MoveFocus(router.FocusUp)
-		case C.AKEYCODE_DPAD_DOWN:
-			w.callbacks.MoveFocus(router.FocusDown)
-		case C.AKEYCODE_DPAD_LEFT:
-			w.callbacks.MoveFocus(router.FocusLeft)
-		case C.AKEYCODE_DPAD_RIGHT:
-			w.callbacks.MoveFocus(router.FocusRight)
-		case C.AKEYCODE_DPAD_CENTER:
-			w.callbacks.ClickFocus()
-		}
+	if pressed == C.JNI_TRUE && keyCode == C.AKEYCODE_DPAD_CENTER {
+		w.callbacks.ClickFocus()
+		return
 	}
 	if n, ok := convertKeyCode(keyCode); ok {
 		state := key.Release
 		if pressed == C.JNI_TRUE {
 			state = key.Press
 		}
-		w.callbacks.Event(key.Event{Name: n, State: state})
+		w.processEvent(key.Event{Name: n, State: state})
 	}
 	if pressed == C.JNI_TRUE && r != 0 && r != '\n' { // Checking for "\n" to prevent duplication with key.NameEnter (gio#224).
 		w.callbacks.EditorInsert(string(rune(r)))
@@ -946,18 +980,18 @@ func Java_org_gioui_GioView_onKeyEvent(env *C.JNIEnv, class C.jclass, handle C.j
 //export Java_org_gioui_GioView_onTouchEvent
 func Java_org_gioui_GioView_onTouchEvent(env *C.JNIEnv, class C.jclass, handle C.jlong, action, pointerID, tool C.jint, x, y, scrollX, scrollY C.jfloat, jbtns C.jint, t C.jlong) {
 	w := cgo.Handle(handle).Value().(*window)
-	var typ pointer.Type
+	var kind pointer.Kind
 	switch action {
 	case C.AMOTION_EVENT_ACTION_DOWN, C.AMOTION_EVENT_ACTION_POINTER_DOWN:
-		typ = pointer.Press
+		kind = pointer.Press
 	case C.AMOTION_EVENT_ACTION_UP, C.AMOTION_EVENT_ACTION_POINTER_UP:
-		typ = pointer.Release
+		kind = pointer.Release
 	case C.AMOTION_EVENT_ACTION_CANCEL:
-		typ = pointer.Cancel
+		kind = pointer.Cancel
 	case C.AMOTION_EVENT_ACTION_MOVE:
-		typ = pointer.Move
+		kind = pointer.Move
 	case C.AMOTION_EVENT_ACTION_SCROLL:
-		typ = pointer.Scroll
+		kind = pointer.Scroll
 	default:
 		return
 	}
@@ -986,8 +1020,8 @@ func Java_org_gioui_GioView_onTouchEvent(env *C.JNIEnv, class C.jclass, handle C
 	default:
 		return
 	}
-	w.callbacks.Event(pointer.Event{
-		Type:      typ,
+	w.processEvent(pointer.Event{
+		Kind:      kind,
 		Source:    src,
 		Buttons:   btns,
 		PointerID: pointer.ID(pointerID),
@@ -1057,6 +1091,12 @@ func Java_org_gioui_GioView_imeSnippetStart(env *C.JNIEnv, class C.jclass, handl
 //export Java_org_gioui_GioView_imeSetSnippet
 func Java_org_gioui_GioView_imeSetSnippet(env *C.JNIEnv, class C.jclass, handle C.jlong, start, end C.jint) {
 	w := cgo.Handle(handle).Value().(*window)
+	if start < 0 {
+		start = 0
+	}
+	if end < start {
+		end = start
+	}
 	r := key.Range{Start: int(start), End: int(end)}
 	w.callbacks.SetEditorSnippet(r)
 }
@@ -1132,22 +1172,41 @@ func (w *window) ShowTextInput(show bool) {
 }
 
 func (w *window) SetInputHint(mode key.InputHint) {
+	w.inputHint = mode
+
 	// Constants defined at https://developer.android.com/reference/android/text/InputType.
 	const (
-		TYPE_NULL                            = 0
-		TYPE_CLASS_TEXT                      = 1
-		TYPE_CLASS_NUMBER                    = 2
-		TYPE_NUMBER_FLAG_DECIMAL             = 8192
-		TYPE_NUMBER_FLAG_SIGNED              = 4096
-		TYPE_TEXT_FLAG_NO_SUGGESTIONS        = 524288
-		TYPE_TEXT_VARIATION_VISIBLE_PASSWORD = 144
+		TYPE_NULL = 0
+
+		TYPE_CLASS_TEXT                   = 1
+		TYPE_TEXT_VARIATION_EMAIL_ADDRESS = 32
+		TYPE_TEXT_VARIATION_URI           = 16
+		TYPE_TEXT_VARIATION_PASSWORD      = 128
+		TYPE_TEXT_FLAG_CAP_SENTENCES      = 16384
+		TYPE_TEXT_FLAG_AUTO_CORRECT       = 32768
+
+		TYPE_CLASS_NUMBER        = 2
+		TYPE_NUMBER_FLAG_DECIMAL = 8192
+		TYPE_NUMBER_FLAG_SIGNED  = 4096
+
+		TYPE_CLASS_PHONE = 3
 	)
 
 	runInJVM(javaVM(), func(env *C.JNIEnv) {
 		var m jvalue
 		switch mode {
+		case key.HintText:
+			m = TYPE_CLASS_TEXT | TYPE_TEXT_FLAG_AUTO_CORRECT | TYPE_TEXT_FLAG_CAP_SENTENCES
 		case key.HintNumeric:
 			m = TYPE_CLASS_NUMBER | TYPE_NUMBER_FLAG_DECIMAL | TYPE_NUMBER_FLAG_SIGNED
+		case key.HintEmail:
+			m = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_EMAIL_ADDRESS
+		case key.HintURL:
+			m = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_URI
+		case key.HintTelephone:
+			m = TYPE_CLASS_PHONE
+		case key.HintPassword:
+			m = TYPE_CLASS_TEXT | TYPE_TEXT_VARIATION_PASSWORD
 		default:
 			m = TYPE_CLASS_TEXT
 		}
@@ -1261,14 +1320,14 @@ func findClass(env *C.JNIEnv, name string) C.jclass {
 func osMain() {
 }
 
-func newWindow(window *callbacks, options []Option) error {
+func newWindow(window *callbacks, options []Option) {
 	mainWindow.in <- windowAndConfig{window, options}
-	return <-mainWindow.errs
+	<-mainWindow.windows
 }
 
-func (w *window) WriteClipboard(s string) {
+func (w *window) WriteClipboard(mime string, s []byte) {
 	runInJVM(javaVM(), func(env *C.JNIEnv) {
-		jstr := javaString(env, s)
+		jstr := javaString(env, string(s))
 		callStaticVoidMethod(env, android.gioCls, android.mwriteClipboard,
 			jvalue(android.appCtx), jvalue(jstr))
 	})
@@ -1282,52 +1341,57 @@ func (w *window) ReadClipboard() {
 			return
 		}
 		content := goString(env, C.jstring(c))
-		w.callbacks.Event(clipboard.Event{Text: content})
+		w.processEvent(transfer.DataEvent{
+			Type: "application/text",
+			Open: func() io.ReadCloser {
+				return io.NopCloser(strings.NewReader(content))
+			},
+		})
 	})
 }
 
 func (w *window) Configure(options []Option) {
+	cnf := w.config
+	cnf.apply(unit.Metric{}, options)
 	runInJVM(javaVM(), func(env *C.JNIEnv) {
-		prev := w.config
-		cnf := w.config
-		cnf.apply(unit.Metric{}, options)
-		// Decorations are never disabled.
-		cnf.Decorated = true
-
-		if prev.Orientation != cnf.Orientation {
-			w.config.Orientation = cnf.Orientation
-			setOrientation(env, w.view, cnf.Orientation)
-		}
-		if prev.NavigationColor != cnf.NavigationColor {
-			w.config.NavigationColor = cnf.NavigationColor
-			setNavigationColor(env, w.view, cnf.NavigationColor)
-		}
-		if prev.StatusColor != cnf.StatusColor {
-			w.config.StatusColor = cnf.StatusColor
-			setStatusColor(env, w.view, cnf.StatusColor)
-		}
-		if prev.Mode != cnf.Mode {
-			switch cnf.Mode {
-			case Fullscreen:
-				callVoidMethod(env, w.view, gioView.setFullscreen, C.JNI_TRUE)
-				w.config.Mode = Fullscreen
-			case Windowed:
-				callVoidMethod(env, w.view, gioView.setFullscreen, C.JNI_FALSE)
-				w.config.Mode = Windowed
-			}
-		}
-		if cnf.Decorated != prev.Decorated {
-			w.config.Decorated = cnf.Decorated
-		}
-		if w.config != prev {
-			w.callbacks.Event(ConfigEvent{Config: w.config})
-		}
+		w.setConfig(env, cnf)
 	})
 }
 
-func (w *window) Perform(system.Action) {}
+func (w *window) setConfig(env *C.JNIEnv, cnf Config) {
+	prev := w.config
+	// Decorations are never disabled.
+	cnf.Decorated = true
 
-func (w *window) Raise() {}
+	if prev.Orientation != cnf.Orientation {
+		w.config.Orientation = cnf.Orientation
+		setOrientation(env, w.view, cnf.Orientation)
+	}
+	if prev.NavigationColor != cnf.NavigationColor {
+		w.config.NavigationColor = cnf.NavigationColor
+		setNavigationColor(env, w.view, cnf.NavigationColor)
+	}
+	if prev.StatusColor != cnf.StatusColor {
+		w.config.StatusColor = cnf.StatusColor
+		setStatusColor(env, w.view, cnf.StatusColor)
+	}
+	if prev.Mode != cnf.Mode {
+		switch cnf.Mode {
+		case Fullscreen:
+			callVoidMethod(env, w.view, gioView.setFullscreen, C.JNI_TRUE)
+			w.config.Mode = Fullscreen
+		case Windowed:
+			callVoidMethod(env, w.view, gioView.setFullscreen, C.JNI_FALSE)
+			w.config.Mode = Windowed
+		}
+	}
+	if cnf.Decorated != prev.Decorated {
+		w.config.Decorated = cnf.Decorated
+	}
+	w.processEvent(ConfigEvent{Config: w.config})
+}
+
+func (w *window) Perform(system.Action) {}
 
 func (w *window) SetCursor(cursor pointer.Cursor) {
 	runInJVM(javaVM(), func(env *C.JNIEnv) {
@@ -1335,9 +1399,10 @@ func (w *window) SetCursor(cursor pointer.Cursor) {
 	})
 }
 
-func (w *window) Wakeup() {
+func (w *window) wakeup() {
 	runOnMain(func(env *C.JNIEnv) {
-		w.callbacks.Event(wakeupEvent{})
+		w.loop.Wakeup()
+		w.loop.FlushEvents()
 	})
 }
 
@@ -1406,9 +1471,6 @@ func setNavigationColor(env *C.JNIEnv, view C.jobject, color color.NRGBA) {
 	)
 }
 
-// Close the window. Not implemented for Android.
-func (w *window) Close() {}
-
 // runOnMain runs a function on the Java main thread.
 func runOnMain(f func(env *C.JNIEnv)) {
 	go func() {
@@ -1431,4 +1493,8 @@ func Java_org_gioui_Gio_scheduleMainFuncs(env *C.JNIEnv, cls C.jclass) {
 	}
 }
 
-func (_ ViewEvent) ImplementsEvent() {}
+func (AndroidViewEvent) implementsViewEvent() {}
+func (AndroidViewEvent) ImplementsEvent()     {}
+func (a AndroidViewEvent) Valid() bool {
+	return a != (AndroidViewEvent{})
+}

app/os_darwin.go

@@ -6,7 +6,7 @@ package app
 #include <Foundation/Foundation.h>
 
 __attribute__ ((visibility ("hidden"))) void gio_wakeupMainThread(void);
-__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createDisplayLink(uintptr_t handle);
+__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createDisplayLink(void);
 __attribute__ ((visibility ("hidden"))) void gio_releaseDisplayLink(CFTypeRef dl);
 __attribute__ ((visibility ("hidden"))) int gio_startDisplayLink(CFTypeRef dl);
 __attribute__ ((visibility ("hidden"))) int gio_stopDisplayLink(CFTypeRef dl);
@@ -42,7 +42,7 @@ static CFTypeRef newNSString(unichar *chars, NSUInteger length) {
 import "C"
 import (
 	"errors"
-	"runtime/cgo"
+	"sync"
 	"sync/atomic"
 	"time"
 	"unicode/utf16"
@@ -70,11 +70,18 @@ type displayLink struct {
 	running uint32
 }
 
+// displayLinks maps CFTypeRefs to *displayLinks.
+var displayLinks sync.Map
+
 var mainFuncs = make(chan func(), 1)
 
+func isMainThread() bool {
+	return bool(C.isMainThread())
+}
+
 // runOnMain runs the function on the main thread.
 func runOnMain(f func()) {
-	if C.isMainThread() {
+	if isMainThread() {
 		f()
 		return
 	}
@@ -121,25 +128,25 @@ func stringToNSString(str string) C.CFTypeRef {
 	return C.newNSString(chars, C.NSUInteger(len(u16)))
 }
 
-func NewDisplayLink(callback func()) (*displayLink, error) {
+func newDisplayLink(callback func()) (*displayLink, error) {
 	d := &displayLink{
 		callback: callback,
 		done:     make(chan struct{}),
 		states:   make(chan bool),
 		dids:     make(chan uint64),
 	}
-	h := cgo.NewHandle(d)
-	dl := C.gio_createDisplayLink(C.uintptr_t(h))
+	dl := C.gio_createDisplayLink()
 	if dl == 0 {
 		return nil, errors.New("app: failed to create display link")
 	}
-	go d.run(dl, h)
+	go d.run(dl)
 	return d, nil
 }
 
-func (d *displayLink) run(dl C.CFTypeRef, h cgo.Handle) {
+func (d *displayLink) run(dl C.CFTypeRef) {
 	defer C.gio_releaseDisplayLink(dl)
-	defer h.Delete()
+	displayLinks.Store(dl, d)
+	defer displayLinks.Delete(dl)
 	var stopTimer *time.Timer
 	var tchan <-chan time.Time
 	started := false
@@ -200,10 +207,14 @@ func (d *displayLink) SetDisplayID(did uint64) {
 }
 
 //export gio_onFrameCallback
-func gio_onFrameCallback(dl C.CFTypeRef, handle C.uintptr_t) {
-	d := cgo.Handle(handle).Value().(*displayLink)
-	if atomic.LoadUint32(&d.running) != 0 {
-		d.callback()
+func gio_onFrameCallback(ref C.CFTypeRef) {
+	d, exists := displayLinks.Load(ref)
+	if !exists {
+		return
+	}
+	dl := d.(*displayLink)
+	if atomic.LoadUint32(&dl.running) != 0 {
+		dl.callback()
 	}
 }
 
@@ -253,8 +264,9 @@ func windowSetCursor(from, to pointer.Cursor) pointer.Cursor {
 	return to
 }
 
-func (w *window) Wakeup() {
+func (w *window) wakeup() {
 	runOnMain(func() {
-		w.w.Event(wakeupEvent{})
+		w.loop.Wakeup()
+		w.loop.FlushEvents()
 	})
 }

app/os_darwin.m

@@ -1,7 +1,6 @@
 // SPDX-License-Identifier: Unlicense OR MIT
 
-@import Dispatch;
-@import Foundation;
+#import <Foundation/Foundation.h>
 
 #include "_cgo_export.h"
 

app/os_ios.go

@@ -12,6 +12,9 @@ package app
 #include <UIKit/UIKit.h>
 #include <stdint.h>
 
+__attribute__ ((visibility ("hidden"))) int gio_applicationMain(int argc, char *argv[]);
+__attribute__ ((visibility ("hidden"))) void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle);
+
 struct drawParams {
 	CGFloat dpi, sdpi;
 	CGFloat width, height;
@@ -19,6 +22,7 @@ struct drawParams {
 };
 
 static void writeClipboard(unichar *chars, NSUInteger length) {
+#if !TARGET_OS_TV
 	@autoreleasepool {
 		NSString *s = [NSString string];
 		if (length > 0) {
@@ -27,13 +31,18 @@ static void writeClipboard(unichar *chars, NSUInteger length) {
 		UIPasteboard *p = UIPasteboard.generalPasteboard;
 		p.string = s;
 	}
+#endif
 }
 
 static CFTypeRef readClipboard(void) {
+#if !TARGET_OS_TV
 	@autoreleasepool {
 		UIPasteboard *p = UIPasteboard.generalPasteboard;
 		return (__bridge_retained CFTypeRef)p.string;
 	}
+#else
+	return nil;
+#endif
 }
 
 static void showTextInput(CFTypeRef viewRef) {
@@ -72,21 +81,27 @@ import "C"
 
 import (
 	"image"
+	"io"
+	"os"
 	"runtime"
+	"runtime/cgo"
 	"runtime/debug"
+	"strings"
 	"time"
 	"unicode/utf16"
 	"unsafe"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
+	"gioui.org/op"
 	"gioui.org/unit"
 )
 
-type ViewEvent struct {
+type UIKitViewEvent struct {
 	// ViewController is a CFTypeRef for the UIViewController backing a Window.
 	ViewController uintptr
 }
@@ -95,18 +110,17 @@ type window struct {
 	view        C.CFTypeRef
 	w           *callbacks
 	displayLink *displayLink
+	loop        *eventLoop
 
-	visible bool
-	cursor  pointer.Cursor
-	config  Config
+	hidden bool
+	cursor pointer.Cursor
+	config Config
 
 	pointerMap []C.CFTypeRef
 }
 
 var mainWindow = newWindowRendezvous()
 
-var views = make(map[C.CFTypeRef]*window)
-
 func init() {
 	// Darwin requires UI operations happen on the main thread only.
 	runtime.LockOSThread()
@@ -114,85 +128,99 @@ func init() {
 
 //export onCreate
 func onCreate(view, controller C.CFTypeRef) {
+	wopts := <-mainWindow.out
 	w := &window{
 		view: view,
+		w:    wopts.window,
 	}
-	dl, err := NewDisplayLink(func() {
+	w.loop = newEventLoop(w.w, w.wakeup)
+	w.w.SetDriver(w)
+	mainWindow.windows <- struct{}{}
+	dl, err := newDisplayLink(func() {
 		w.draw(false)
 	})
 	if err != nil {
-		panic(err)
+		w.w.ProcessEvent(DestroyEvent{Err: err})
+		return
 	}
 	w.displayLink = dl
-	wopts := <-mainWindow.out
-	w.w = wopts.window
-	w.w.SetDriver(w)
-	views[view] = w
+	C.gio_viewSetHandle(view, C.uintptr_t(cgo.NewHandle(w)))
 	w.Configure(wopts.options)
-	w.w.Event(system.StageEvent{Stage: system.StagePaused})
-	w.w.Event(ViewEvent{ViewController: uintptr(controller)})
+	w.ProcessEvent(UIKitViewEvent{ViewController: uintptr(controller)})
+}
+
+func viewFor(h C.uintptr_t) *window {
+	return cgo.Handle(h).Value().(*window)
 }
 
 //export gio_onDraw
-func gio_onDraw(view C.CFTypeRef) {
-	w := views[view]
+func gio_onDraw(h C.uintptr_t) {
+	w := viewFor(h)
 	w.draw(true)
 }
 
 func (w *window) draw(sync bool) {
+	if w.hidden {
+		return
+	}
 	params := C.viewDrawParams(w.view)
 	if params.width == 0 || params.height == 0 {
 		return
 	}
-	wasVisible := w.visible
-	w.visible = true
-	if !wasVisible {
-		w.w.Event(system.StageEvent{Stage: system.StageRunning})
-	}
 	const inchPrDp = 1.0 / 163
-	w.w.Event(frameEvent{
-		FrameEvent: system.FrameEvent{
+	m := unit.Metric{
+		PxPerDp: float32(params.dpi) * inchPrDp,
+		PxPerSp: float32(params.sdpi) * inchPrDp,
+	}
+	dppp := unit.Dp(1. / m.PxPerDp)
+	w.ProcessEvent(frameEvent{
+		FrameEvent: FrameEvent{
 			Now: time.Now(),
 			Size: image.Point{
 				X: int(params.width + .5),
 				Y: int(params.height + .5),
 			},
-			Insets: system.Insets{
-				Top:    unit.Px(float32(params.top)),
-				Bottom: unit.Px(float32(params.bottom)),
-				Left:   unit.Px(float32(params.left)),
-				Right:  unit.Px(float32(params.right)),
-			},
-			Metric: unit.Metric{
-				PxPerDp: float32(params.dpi) * inchPrDp,
-				PxPerSp: float32(params.sdpi) * inchPrDp,
+			Insets: Insets{
+				Top:    unit.Dp(params.top) * dppp,
+				Bottom: unit.Dp(params.bottom) * dppp,
+				Left:   unit.Dp(params.left) * dppp,
+				Right:  unit.Dp(params.right) * dppp,
 			},
+			Metric: m,
 		},
 		Sync: sync,
 	})
 }
 
 //export onStop
-func onStop(view C.CFTypeRef) {
-	w := views[view]
-	w.visible = false
-	w.w.Event(system.StageEvent{Stage: system.StagePaused})
+func onStop(h C.uintptr_t) {
+	w := viewFor(h)
+	w.hidden = true
+}
+
+//export onStart
+func onStart(h C.uintptr_t) {
+	w := viewFor(h)
+	w.hidden = false
+	w.draw(true)
 }
 
 //export onDestroy
-func onDestroy(view C.CFTypeRef) {
-	w := views[view]
-	delete(views, view)
-	w.w.Event(ViewEvent{})
-	w.w.Event(system.DestroyEvent{})
+func onDestroy(h C.uintptr_t) {
+	w := viewFor(h)
+	w.ProcessEvent(UIKitViewEvent{})
+	w.ProcessEvent(DestroyEvent{})
 	w.displayLink.Close()
+	w.displayLink = nil
+	cgo.Handle(h).Delete()
 	w.view = 0
 }
 
 //export onFocus
-func onFocus(view C.CFTypeRef, focus int) {
-	w := views[view]
-	w.w.Event(key.FocusEvent{Focus: focus != 0})
+func onFocus(h C.uintptr_t, focus int) {
+	w := viewFor(h)
+	w.config.Focused = focus != 0
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 //export onLowMemory
@@ -202,56 +230,56 @@ func onLowMemory() {
 }
 
 //export onUpArrow
-func onUpArrow(view C.CFTypeRef) {
-	views[view].onKeyCommand(key.NameUpArrow)
+func onUpArrow(h C.uintptr_t) {
+	viewFor(h).onKeyCommand(key.NameUpArrow)
 }
 
 //export onDownArrow
-func onDownArrow(view C.CFTypeRef) {
-	views[view].onKeyCommand(key.NameDownArrow)
+func onDownArrow(h C.uintptr_t) {
+	viewFor(h).onKeyCommand(key.NameDownArrow)
 }
 
 //export onLeftArrow
-func onLeftArrow(view C.CFTypeRef) {
-	views[view].onKeyCommand(key.NameLeftArrow)
+func onLeftArrow(h C.uintptr_t) {
+	viewFor(h).onKeyCommand(key.NameLeftArrow)
 }
 
 //export onRightArrow
-func onRightArrow(view C.CFTypeRef) {
-	views[view].onKeyCommand(key.NameRightArrow)
+func onRightArrow(h C.uintptr_t) {
+	viewFor(h).onKeyCommand(key.NameRightArrow)
 }
 
 //export onDeleteBackward
-func onDeleteBackward(view C.CFTypeRef) {
-	views[view].onKeyCommand(key.NameDeleteBackward)
+func onDeleteBackward(h C.uintptr_t) {
+	viewFor(h).onKeyCommand(key.NameDeleteBackward)
 }
 
 //export onText
-func onText(view, str C.CFTypeRef) {
-	w := views[view]
+func onText(h C.uintptr_t, str C.CFTypeRef) {
+	w := viewFor(h)
 	w.w.EditorInsert(nsstringToString(str))
 }
 
 //export onTouch
-func onTouch(last C.int, view, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.CGFloat, ti C.double) {
-	var typ pointer.Type
+func onTouch(h C.uintptr_t, last C.int, touchRef C.CFTypeRef, phase C.NSInteger, x, y C.CGFloat, ti C.double) {
+	var kind pointer.Kind
 	switch phase {
 	case C.UITouchPhaseBegan:
-		typ = pointer.Press
+		kind = pointer.Press
 	case C.UITouchPhaseMoved:
-		typ = pointer.Move
+		kind = pointer.Move
 	case C.UITouchPhaseEnded:
-		typ = pointer.Release
+		kind = pointer.Release
 	case C.UITouchPhaseCancelled:
-		typ = pointer.Cancel
+		kind = pointer.Cancel
 	default:
 		return
 	}
-	w := views[view]
+	w := viewFor(h)
 	t := time.Duration(float64(ti) * float64(time.Second))
 	p := f32.Point{X: float32(x), Y: float32(y)}
-	w.w.Event(pointer.Event{
-		Type:      typ,
+	w.ProcessEvent(pointer.Event{
+		Kind:      kind,
 		Source:    pointer.Touch,
 		PointerID: w.lookupTouch(last != 0, touchRef),
 		Position:  p,
@@ -263,11 +291,16 @@ func (w *window) ReadClipboard() {
 	cstr := C.readClipboard()
 	defer C.CFRelease(cstr)
 	content := nsstringToString(cstr)
-	w.w.Event(clipboard.Event{Text: content})
+	w.ProcessEvent(transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader(content))
+		},
+	})
 }
 
-func (w *window) WriteClipboard(s string) {
-	u16 := utf16.Encode([]rune(s))
+func (w *window) WriteClipboard(mime string, s []byte) {
+	u16 := utf16.Encode([]rune(string(s)))
 	var chars *C.unichar
 	if len(u16) > 0 {
 		chars = (*C.unichar)(unsafe.Pointer(&u16[0]))
@@ -276,25 +309,16 @@ func (w *window) WriteClipboard(s string) {
 }
 
 func (w *window) Configure([]Option) {
-	prev := w.config
 	// Decorations are never disabled.
 	w.config.Decorated = true
-	if w.config != prev {
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 func (w *window) EditorStateChanged(old, new editorState) {}
 
 func (w *window) Perform(system.Action) {}
 
-func (w *window) Raise() {}
-
 func (w *window) SetAnimating(anim bool) {
-	v := w.view
-	if v == 0 {
-		return
-	}
 	if anim {
 		w.displayLink.Start()
 	} else {
@@ -306,8 +330,8 @@ func (w *window) SetCursor(cursor pointer.Cursor) {
 	w.cursor = windowSetCursor(w.cursor, cursor)
 }
 
-func (w *window) onKeyCommand(name string) {
-	w.w.Event(key.Event{
+func (w *window) onKeyCommand(name key.Name) {
+	w.ProcessEvent(key.Event{
 		Name: name,
 	})
 }
@@ -346,20 +370,77 @@ func (w *window) ShowTextInput(show bool) {
 
 func (w *window) SetInputHint(_ key.InputHint) {}
 
-// Close the window. Not implemented for iOS.
-func (w *window) Close() {}
-
-func newWindow(win *callbacks, options []Option) error {
-	mainWindow.in <- windowAndConfig{win, options}
-	return <-mainWindow.errs
+func (w *window) ProcessEvent(e event.Event) {
+	w.w.ProcessEvent(e)
+	w.loop.FlushEvents()
 }
 
+func (w *window) Event() event.Event {
+	return w.loop.Event()
+}
+
+func (w *window) Invalidate() {
+	w.loop.Invalidate()
+}
+
+func (w *window) Run(f func()) {
+	w.loop.Run(f)
+}
+
+func (w *window) Frame(frame *op.Ops) {
+	w.loop.Frame(frame)
+}
+
+func newWindow(win *callbacks, options []Option) {
+	mainWindow.in <- windowAndConfig{win, options}
+	<-mainWindow.windows
+}
+
+var mainMode = mainModeUndefined
+
+const (
+	mainModeUndefined = iota
+	mainModeExe
+	mainModeLibrary
+)
+
 func osMain() {
+	if !isMainThread() {
+		panic("app.Main must be run on the main goroutine")
+	}
+	switch mainMode {
+	case mainModeUndefined:
+		mainMode = mainModeExe
+		var argv []*C.char
+		for _, arg := range os.Args {
+			a := C.CString(arg)
+			defer C.free(unsafe.Pointer(a))
+			argv = append(argv, a)
+		}
+		C.gio_applicationMain(C.int(len(argv)), unsafe.SliceData(argv))
+	case mainModeExe:
+		panic("app.Main may be called only once")
+	case mainModeLibrary:
+		// Do nothing, we're embedded as a library.
+	}
 }
 
 //export gio_runMain
 func gio_runMain() {
-	runMain()
+	if !isMainThread() {
+		panic("app.Main must be run on the main goroutine")
+	}
+	switch mainMode {
+	case mainModeUndefined:
+		mainMode = mainModeLibrary
+		runMain()
+	case mainModeExe:
+		// Do nothing, main has already been called.
+	}
 }
 
-func (_ ViewEvent) ImplementsEvent() {}
+func (UIKitViewEvent) implementsViewEvent() {}
+func (UIKitViewEvent) ImplementsEvent()     {}
+func (u UIKitViewEvent) Valid() bool {
+	return u != (UIKitViewEvent{})
+}

app/os_ios.m

@@ -11,6 +11,7 @@
 __attribute__ ((visibility ("hidden"))) Class gio_layerClass(void);
 
 @interface GioView: UIView <UIKeyInput>
+@property uintptr_t handle;
 @end
 
 @implementation GioViewController
@@ -25,12 +26,13 @@ CGFloat _keyboardHeight;
 	self.view.layoutMargins = UIEdgeInsetsMake(0, 0, 0, 0);
 	UIView *drawView = [[GioView alloc] initWithFrame:zeroFrame];
 	[self.view addSubview: drawView];
-#ifndef TARGET_OS_TV
+#if !TARGET_OS_TV
 	drawView.multipleTouchEnabled = YES;
 #endif
 	drawView.preservesSuperviewLayoutMargins = YES;
 	drawView.layoutMargins = UIEdgeInsetsMake(0, 0, 0, 0);
 	onCreate((__bridge CFTypeRef)drawView, (__bridge CFTypeRef)self);
+#if !TARGET_OS_TV
 	[[NSNotificationCenter defaultCenter] addObserver:self
 											 selector:@selector(keyboardWillChange:)
 												 name:UIKeyboardWillShowNotification
@@ -43,6 +45,7 @@ CGFloat _keyboardHeight;
 											 selector:@selector(keyboardWillHide:)
 												 name:UIKeyboardWillHideNotification
 											   object:nil];
+#endif
 	[[NSNotificationCenter defaultCenter] addObserver: self
 											 selector: @selector(applicationDidEnterBackground:)
 												 name: UIApplicationDidEnterBackgroundNotification
@@ -54,33 +57,33 @@ CGFloat _keyboardHeight;
 }
 
 - (void)applicationWillEnterForeground:(UIApplication *)application {
-	UIView *drawView = self.view.subviews[0];
-	if (drawView != nil) {
-		gio_onDraw((__bridge CFTypeRef)drawView);
+	GioView *view = (GioView *)self.view.subviews[0];
+	if (view != nil) {
+		onStart(view.handle);
 	}
 }
 
 - (void)applicationDidEnterBackground:(UIApplication *)application {
-	UIView *drawView = self.view.subviews[0];
-	if (drawView != nil) {
-		onStop((__bridge CFTypeRef)drawView);
+	GioView *view = (GioView *)self.view.subviews[0];
+	if (view != nil) {
+		onStop(view.handle);
 	}
 }
 
 - (void)viewDidDisappear:(BOOL)animated {
 	[super viewDidDisappear:animated];
-	CFTypeRef viewRef = (__bridge CFTypeRef)self.view.subviews[0];
-	onDestroy(viewRef);
+	GioView *view = (GioView *)self.view.subviews[0];
+	onDestroy(view.handle);
 }
 
 - (void)viewDidLayoutSubviews {
 	[super viewDidLayoutSubviews];
-	UIView *view = self.view.subviews[0];
+	GioView *view = (GioView *)self.view.subviews[0];
 	CGRect frame = self.view.bounds;
 	// Adjust view bounds to make room for the keyboard.
 	frame.size.height -= _keyboardHeight;
 	view.frame = frame;
-	gio_onDraw((__bridge CFTypeRef)view);
+	gio_onDraw(view.handle);
 }
 
 - (void)didReceiveMemoryWarning {
@@ -88,6 +91,7 @@ CGFloat _keyboardHeight;
 	[super didReceiveMemoryWarning];
 }
 
+#if !TARGET_OS_TV
 - (void)keyboardWillChange:(NSNotification *)note {
 	NSDictionary *userInfo = note.userInfo;
 	CGRect f = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
@@ -99,13 +103,13 @@ CGFloat _keyboardHeight;
 	_keyboardHeight = 0.0;
 	[self.view setNeedsLayout];
 }
+#endif
 @end
 
-static void handleTouches(int last, UIView *view, NSSet<UITouch *> *touches, UIEvent *event) {
+static void handleTouches(int last, GioView *view, NSSet<UITouch *> *touches, UIEvent *event) {
 	CGFloat scale = view.contentScaleFactor;
 	NSUInteger i = 0;
 	NSUInteger n = [touches count];
-	CFTypeRef viewRef = (__bridge CFTypeRef)view;
 	for (UITouch *touch in touches) {
 		CFTypeRef touchRef = (__bridge CFTypeRef)touch;
 		i++;
@@ -116,13 +120,16 @@ static void handleTouches(int last, UIView *view, NSSet<UITouch *> *touches, UIE
 			CGPoint loc = [coalescedTouch locationInView:view];
 			j++;
 			int lastTouch = last && i == n && j == m;
-			onTouch(lastTouch, viewRef, touchRef, touch.phase, loc.x*scale, loc.y*scale, [coalescedTouch timestamp]);
+			onTouch(view.handle, lastTouch, touchRef, touch.phase, loc.x*scale, loc.y*scale, [coalescedTouch timestamp]);
 		}
 	}
 }
 
 @implementation GioView
 NSArray<UIKeyCommand *> *_keyCommands;
++ (void)onFrameCallback:(CADisplayLink *)link {
+       gio_onFrameCallback((__bridge CFTypeRef)link);
+}
 + (Class)layerClass {
     return gio_layerClass();
 }
@@ -148,13 +155,13 @@ NSArray<UIKeyCommand *> *_keyCommands;
 
 - (void)onWindowDidBecomeKey:(NSNotification *)note {
 	if (self.isFirstResponder) {
-		onFocus((__bridge CFTypeRef)self, YES);
+		onFocus(self.handle, YES);
 	}
 }
 
 - (void)onWindowDidResignKey:(NSNotification *)note {
 	if (self.isFirstResponder) {
-		onFocus((__bridge CFTypeRef)self, NO);
+		onFocus(self.handle, NO);
 	}
 }
 
@@ -175,7 +182,7 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
 
 - (void)insertText:(NSString *)text {
-	onText((__bridge CFTypeRef)self, (__bridge CFTypeRef)text);
+	onText(self.handle, (__bridge CFTypeRef)text);
 }
 
 - (BOOL)canBecomeFirstResponder {
@@ -187,23 +194,23 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
 
 - (void)deleteBackward {
-	onDeleteBackward((__bridge CFTypeRef)self);
+	onDeleteBackward(self.handle);
 }
 
 - (void)onUpArrow {
-	onUpArrow((__bridge CFTypeRef)self);
+	onUpArrow(self.handle);
 }
 
 - (void)onDownArrow {
-	onDownArrow((__bridge CFTypeRef)self);
+	onDownArrow(self.handle);
 }
 
 - (void)onLeftArrow {
-	onLeftArrow((__bridge CFTypeRef)self);
+	onLeftArrow(self.handle);
 }
 
 - (void)onRightArrow {
-	onRightArrow((__bridge CFTypeRef)self);
+	onRightArrow(self.handle);
 }
 
 - (NSArray<UIKeyCommand *> *)keyCommands {
@@ -227,23 +234,8 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
 @end
 
-@interface DisplayLinkHandle : NSObject {
-}
-@property uintptr_t handle;
-@end
-
-@implementation DisplayLinkHandle {
-}
-
-- (void)onFrameCallback:(CADisplayLink *)link {
-	gio_onFrameCallback((__bridge CFTypeRef)link, _handle);
-}
-@end
-
-CFTypeRef gio_createDisplayLink(uintptr_t handle) {
-	DisplayLinkHandle *h = [DisplayLinkHandle alloc];
-	h.handle = handle;
-	CADisplayLink *dl = [CADisplayLink displayLinkWithTarget:h selector:@selector(onFrameCallback:)];
+CFTypeRef gio_createDisplayLink(void) {
+	CADisplayLink *dl = [CADisplayLink displayLinkWithTarget:[GioView class] selector:@selector(onFrameCallback:)];
 	dl.paused = YES;
 	NSRunLoop *runLoop = [NSRunLoop mainRunLoop];
 	[dl addToRunLoop:runLoop forMode:[runLoop currentMode]];
@@ -283,3 +275,28 @@ void gio_showCursor() {
 void gio_setCursor(NSUInteger curID) {
 	// Not supported.
 }
+
+void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle) {
+	GioView *v = (__bridge GioView *)viewRef;
+	v.handle = handle;
+}
+
+@interface _gioAppDelegate : UIResponder <UIApplicationDelegate>
+@property (strong, nonatomic) UIWindow *window;
+@end
+
+@implementation _gioAppDelegate
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
+	GioViewController *controller = [[GioViewController alloc] initWithNibName:nil bundle:nil];
+	self.window.rootViewController = controller;
+	[self.window makeKeyAndVisible];
+	return YES;
+}
+@end
+
+int gio_applicationMain(int argc, char *argv[]) {
+	@autoreleasepool {
+		return UIApplicationMain(argc, argv, nil, NSStringFromClass([_gioAppDelegate class]));
+	}
+}

app/os_js.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"image"
 	"image/color"
+	"io"
 	"strings"
 	"syscall/js"
 	"time"
@@ -13,16 +14,28 @@ import (
 	"unicode/utf8"
 
 	"gioui.org/internal/f32color"
+	"gioui.org/op"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 	"gioui.org/unit"
 )
 
-type ViewEvent struct{}
+type JSViewEvent struct {
+	Element js.Value
+}
+
+type contextStatus int
+
+const (
+	contextStatusOkay contextStatus = iota
+	contextStatusLost
+	contextStatusRestored
+)
 
 type window struct {
 	window                js.Value
@@ -43,9 +56,6 @@ type window struct {
 	composing             bool
 	requestFocus          bool
 
-	chanAnimation chan struct{}
-	chanRedraw    chan struct{}
-
 	config    Config
 	inset     f32.Point
 	scale     float32
@@ -54,9 +64,11 @@ type window struct {
 	// is pending.
 	animRequested bool
 	wakeups       chan struct{}
+
+	contextStatus contextStatus
 }
 
-func newWindow(win *callbacks, options []Option) error {
+func newWindow(win *callbacks, options []Option) {
 	doc := js.Global().Get("document")
 	cont := getContainer(doc)
 	cnv := createCanvas(doc)
@@ -71,7 +83,9 @@ func newWindow(win *callbacks, options []Option) error {
 		head:      doc.Get("head"),
 		clipboard: js.Global().Get("navigator").Get("clipboard"),
 		wakeups:   make(chan struct{}, 1),
+		w:         win,
 	}
+	w.w.SetDriver(w)
 	w.requestAnimationFrame = w.window.Get("requestAnimationFrame")
 	w.browserHistory = w.window.Get("history")
 	w.visualViewport = w.window.Get("visualViewport")
@@ -81,41 +95,28 @@ func newWindow(win *callbacks, options []Option) error {
 	if screen := w.window.Get("screen"); screen.Truthy() {
 		w.screenOrientation = screen.Get("orientation")
 	}
-	w.chanAnimation = make(chan struct{}, 1)
-	w.chanRedraw = make(chan struct{}, 1)
 	w.redraw = w.funcOf(func(this js.Value, args []js.Value) interface{} {
-		w.chanAnimation <- struct{}{}
+		w.draw(false)
 		return nil
 	})
 	w.clipboardCallback = w.funcOf(func(this js.Value, args []js.Value) interface{} {
 		content := args[0].String()
-		go win.Event(clipboard.Event{Text: content})
+		w.processEvent(transfer.DataEvent{
+			Type: "application/text",
+			Open: func() io.ReadCloser {
+				return io.NopCloser(strings.NewReader(content))
+			},
+		})
 		return nil
 	})
 	w.addEventListeners()
 	w.addHistory()
-	w.w = win
 
-	go func() {
-		defer w.cleanup()
-		w.w.SetDriver(w)
-		w.Configure(options)
-		w.blur()
-		w.w.Event(system.StageEvent{Stage: system.StageRunning})
-		w.resize()
-		w.draw(true)
-		for {
-			select {
-			case <-w.wakeups:
-				w.w.Event(wakeupEvent{})
-			case <-w.chanAnimation:
-				w.animCallback()
-			case <-w.chanRedraw:
-				w.draw(true)
-			}
-		}
-	}()
-	return nil
+	w.Configure(options)
+	w.blur()
+	w.processEvent(JSViewEvent{Element: cont})
+	w.resize()
+	w.draw(true)
 }
 
 func getContainer(doc js.Value) js.Value {
@@ -162,9 +163,25 @@ func (w *window) cleanup() {
 }
 
 func (w *window) addEventListeners() {
+	w.addEventListener(w.cnv, "webglcontextlost", func(this js.Value, args []js.Value) interface{} {
+		args[0].Call("preventDefault")
+		w.contextStatus = contextStatusLost
+		return nil
+	})
+	w.addEventListener(w.cnv, "webglcontextrestored", func(this js.Value, args []js.Value) interface{} {
+		args[0].Call("preventDefault")
+		w.contextStatus = contextStatusRestored
+
+		// Resize is required to force update the canvas content when restored.
+		w.cnv.Set("width", 0)
+		w.cnv.Set("height", 0)
+		w.resize()
+		w.draw(true)
+		return nil
+	})
 	w.addEventListener(w.visualViewport, "resize", func(this js.Value, args []js.Value) interface{} {
 		w.resize()
-		w.chanRedraw <- struct{}{}
+		w.draw(true)
 		return nil
 	})
 	w.addEventListener(w.window, "contextmenu", func(this js.Value, args []js.Value) interface{} {
@@ -172,25 +189,11 @@ func (w *window) addEventListeners() {
 		return nil
 	})
 	w.addEventListener(w.window, "popstate", func(this js.Value, args []js.Value) interface{} {
-		ev := &system.CommandEvent{Type: system.CommandBack}
-		w.w.Event(ev)
-		if ev.Cancel {
+		if w.processEvent(key.Event{Name: key.NameBack}) {
 			return w.browserHistory.Call("forward")
 		}
-
 		return w.browserHistory.Call("back")
 	})
-	w.addEventListener(w.document, "visibilitychange", func(this js.Value, args []js.Value) interface{} {
-		ev := system.StageEvent{}
-		switch w.document.Get("visibilityState").String() {
-		case "hidden", "prerender", "unloaded":
-			ev.Stage = system.StagePaused
-		default:
-			ev.Stage = system.StageRunning
-		}
-		w.w.Event(ev)
-		return nil
-	})
 	w.addEventListener(w.cnv, "mousemove", func(this js.Value, args []js.Value) interface{} {
 		w.pointerEvent(pointer.Move, 0, 0, args[0])
 		return nil
@@ -210,6 +213,10 @@ func (w *window) addEventListeners() {
 	w.addEventListener(w.cnv, "wheel", func(this js.Value, args []js.Value) interface{} {
 		e := args[0]
 		dx, dy := e.Get("deltaX").Float(), e.Get("deltaY").Float()
+		// horizontal scroll if shift is pressed.
+		if e.Get("shiftKey").Bool() {
+			dx, dy = dy, dx
+		}
 		mode := e.Get("deltaMode").Int()
 		switch mode {
 		case 0x01: // DOM_DELTA_LINE
@@ -244,18 +251,20 @@ func (w *window) addEventListeners() {
 			w.touches[i] = js.Null()
 		}
 		w.touches = w.touches[:0]
-		w.w.Event(pointer.Event{
-			Type:   pointer.Cancel,
+		w.processEvent(pointer.Event{
+			Kind:   pointer.Cancel,
 			Source: pointer.Touch,
 		})
 		return nil
 	})
 	w.addEventListener(w.tarea, "focus", func(this js.Value, args []js.Value) interface{} {
-		w.w.Event(key.FocusEvent{Focus: true})
+		w.config.Focused = true
+		w.processEvent(ConfigEvent{Config: w.config})
 		return nil
 	})
 	w.addEventListener(w.tarea, "blur", func(this js.Value, args []js.Value) interface{} {
-		w.w.Event(key.FocusEvent{Focus: false})
+		w.config.Focused = false
+		w.processEvent(ConfigEvent{Config: w.config})
 		w.blur()
 		return nil
 	})
@@ -328,6 +337,8 @@ func (w *window) keyboard(hint key.InputHint) {
 		m = "url"
 	case key.HintTelephone:
 		m = "tel"
+	case key.HintPassword:
+		m = "password"
 	default:
 		m = "text"
 	}
@@ -342,10 +353,50 @@ func (w *window) keyEvent(e js.Value, ks key.State) {
 			Modifiers: modifiersFor(e),
 			State:     ks,
 		}
-		w.w.Event(cmd)
+		w.processEvent(cmd)
 	}
 }
 
+func (w *window) ProcessEvent(e event.Event) {
+	w.processEvent(e)
+}
+
+func (w *window) processEvent(e event.Event) bool {
+	if !w.w.ProcessEvent(e) {
+		return false
+	}
+	select {
+	case w.wakeups <- struct{}{}:
+	default:
+	}
+	return true
+}
+
+func (w *window) Event() event.Event {
+	for {
+		evt, ok := w.w.nextEvent()
+		if ok {
+			if _, destroy := evt.(DestroyEvent); destroy {
+				w.cleanup()
+			}
+			return evt
+		}
+		<-w.wakeups
+	}
+}
+
+func (w *window) Invalidate() {
+	w.w.Invalidate()
+}
+
+func (w *window) Run(f func()) {
+	f()
+}
+
+func (w *window) Frame(frame *op.Ops) {
+	w.w.ProcessFrame(frame, nil)
+}
+
 // modifiersFor returns the modifier set for a DOM MouseEvent or
 // KeyEvent.
 func modifiersFor(e js.Value) key.Modifiers {
@@ -366,7 +417,7 @@ func modifiersFor(e js.Value) key.Modifiers {
 	return mods
 }
 
-func (w *window) touchEvent(typ pointer.Type, e js.Value) {
+func (w *window) touchEvent(kind pointer.Kind, e js.Value) {
 	e.Call("preventDefault")
 	t := time.Duration(e.Get("timeStamp").Int()) * time.Millisecond
 	changedTouches := e.Get("changedTouches")
@@ -393,8 +444,8 @@ func (w *window) touchEvent(typ pointer.Type, e js.Value) {
 			X: float32(x) * scale,
 			Y: float32(y) * scale,
 		}
-		w.w.Event(pointer.Event{
-			Type:      typ,
+		w.processEvent(pointer.Event{
+			Kind:      kind,
 			Source:    pointer.Touch,
 			Position:  pos,
 			PointerID: pid,
@@ -416,7 +467,7 @@ func (w *window) touchIDFor(touch js.Value) pointer.ID {
 	return pid
 }
 
-func (w *window) pointerEvent(typ pointer.Type, dx, dy float32, e js.Value) {
+func (w *window) pointerEvent(kind pointer.Kind, dx, dy float32, e js.Value) {
 	e.Call("preventDefault")
 	x, y := e.Get("clientX").Float(), e.Get("clientY").Float()
 	rect := w.cnv.Call("getBoundingClientRect")
@@ -443,8 +494,8 @@ func (w *window) pointerEvent(typ pointer.Type, dx, dy float32, e js.Value) {
 	if jbtns&4 != 0 {
 		btns |= pointer.ButtonTertiary
 	}
-	w.w.Event(pointer.Event{
-		Type:      typ,
+	w.processEvent(pointer.Event{
+		Kind:      kind,
 		Source:    pointer.Mouse,
 		Buttons:   btns,
 		Position:  pos,
@@ -470,17 +521,6 @@ func (w *window) funcOf(f func(this js.Value, args []js.Value) interface{}) js.F
 	return jsf
 }
 
-func (w *window) animCallback() {
-	anim := w.animating
-	w.animRequested = anim
-	if anim {
-		w.requestAnimationFrame.Invoke(w.redraw)
-	}
-	if anim {
-		w.draw(false)
-	}
-}
-
 func (w *window) EditorStateChanged(old, new editorState) {}
 
 func (w *window) SetAnimating(anim bool) {
@@ -501,14 +541,14 @@ func (w *window) ReadClipboard() {
 	w.clipboard.Call("readText", w.clipboard).Call("then", w.clipboardCallback)
 }
 
-func (w *window) WriteClipboard(s string) {
+func (w *window) WriteClipboard(mime string, s []byte) {
 	if w.clipboard.IsUndefined() {
 		return
 	}
 	if w.clipboard.Get("writeText").IsUndefined() {
 		return
 	}
-	w.clipboard.Call("writeText", s)
+	w.clipboard.Call("writeText", string(s))
 }
 
 func (w *window) Configure(options []Option) {
@@ -536,15 +576,11 @@ func (w *window) Configure(options []Option) {
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	if w.config != prev {
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
+	w.processEvent(ConfigEvent{Config: w.config})
 }
 
 func (w *window) Perform(system.Action) {}
 
-func (w *window) Raise() {}
-
 var webCursor = [...]string{
 	pointer.CursorDefault:                  "default",
 	pointer.CursorNone:                     "none",
@@ -579,32 +615,20 @@ func (w *window) SetCursor(cursor pointer.Cursor) {
 	style.Set("cursor", webCursor[cursor])
 }
 
-func (w *window) Wakeup() {
-	select {
-	case w.wakeups <- struct{}{}:
-	default:
-	}
-}
-
 func (w *window) ShowTextInput(show bool) {
 	// Run in a goroutine to avoid a deadlock if the
 	// focus change result in an event.
-	go func() {
-		if show {
-			w.focus()
-		} else {
-			w.blur()
-		}
-	}()
+	if show {
+		w.focus()
+	} else {
+		w.blur()
+	}
 }
 
 func (w *window) SetInputHint(mode key.InputHint) {
 	w.keyboard(mode)
 }
 
-// Close the window. Not implemented for js.
-func (w *window) Close() {}
-
 func (w *window) resize() {
 	w.scale = float32(w.window.Get("devicePixelRatio").Float())
 
@@ -615,7 +639,7 @@ func (w *window) resize() {
 	}
 	if size != w.config.Size {
 		w.config.Size = size
-		w.w.Event(ConfigEvent{Config: w.config})
+		w.processEvent(ConfigEvent{Config: w.config})
 	}
 
 	if vx, vy := w.visualViewport.Get("width"), w.visualViewport.Get("height"); !vx.IsUndefined() && !vy.IsUndefined() {
@@ -632,12 +656,23 @@ func (w *window) resize() {
 }
 
 func (w *window) draw(sync bool) {
+	if w.contextStatus == contextStatusLost {
+		return
+	}
+	anim := w.animating
+	w.animRequested = anim
+	if anim {
+		w.requestAnimationFrame.Invoke(w.redraw)
+	} else if !sync {
+		return
+	}
 	size, insets, metric := w.getConfig()
 	if metric == (unit.Metric{}) || size.X == 0 || size.Y == 0 {
 		return
 	}
-	w.w.Event(frameEvent{
-		FrameEvent: system.FrameEvent{
+
+	w.processEvent(frameEvent{
+		FrameEvent: FrameEvent{
 			Now:    time.Now(),
 			Size:   size,
 			Insets: insets,
@@ -647,11 +682,12 @@ func (w *window) draw(sync bool) {
 	})
 }
 
-func (w *window) getConfig() (image.Point, system.Insets, unit.Metric) {
+func (w *window) getConfig() (image.Point, Insets, unit.Metric) {
+	invscale := unit.Dp(1. / w.scale)
 	return image.Pt(w.config.Size.X, w.config.Size.Y),
-		system.Insets{
-			Bottom: unit.Px(w.inset.Y),
-			Right:  unit.Px(w.inset.X),
+		Insets{
+			Bottom: unit.Dp(w.inset.Y) * invscale,
+			Right:  unit.Dp(w.inset.X) * invscale,
 		}, unit.Metric{
 			PxPerDp: w.scale,
 			PxPerSp: w.scale,
@@ -709,8 +745,8 @@ func osMain() {
 	select {}
 }
 
-func translateKey(k string) (string, bool) {
-	var n string
+func translateKey(k string) (key.Name, bool) {
+	var n key.Name
 
 	switch k {
 	case "ArrowUp":
@@ -777,11 +813,15 @@ func translateKey(k string) (string, bool) {
 		r, s := utf8.DecodeRuneInString(k)
 		// If there is exactly one printable character, return that.
 		if s == len(k) && unicode.IsPrint(r) {
-			return strings.ToUpper(k), true
+			return key.Name(strings.ToUpper(k)), true
 		}
 		return "", false
 	}
 	return n, true
 }
 
-func (_ ViewEvent) ImplementsEvent() {}
+func (JSViewEvent) implementsViewEvent() {}
+func (JSViewEvent) ImplementsEvent()     {}
+func (j JSViewEvent) Valid() bool {
+	return !(j.Element.IsNull() || j.Element.IsUndefined())
+}

app/os_macos.m

@@ -2,11 +2,11 @@
 
 // +build darwin,!ios
 
-@import AppKit;
+#import <AppKit/AppKit.h>
 
 #include "_cgo_export.h"
 
-__attribute__ ((visibility ("hidden"))) CALayer *gio_layerFactory(void);
+__attribute__ ((visibility ("hidden"))) CALayer *gio_layerFactory(BOOL presentWithTrans);
 
 @interface GioAppDelegate : NSObject<NSApplicationDelegate>
 @end
@@ -14,45 +14,55 @@ __attribute__ ((visibility ("hidden"))) CALayer *gio_layerFactory(void);
 @interface GioWindowDelegate : NSObject<NSWindowDelegate>
 @end
 
+@interface GioView : NSView <CALayerDelegate,NSTextInputClient>
+@property uintptr_t handle;
+@property BOOL presentWithTrans;
+@end
+
 @implementation GioWindowDelegate
 - (void)windowWillMiniaturize:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onHide((__bridge CFTypeRef)window.contentView);
+  GioView *view = (GioView *)window.contentView;
+	gio_onHide(view.handle);
 }
 - (void)windowDidDeminiaturize:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onShow((__bridge CFTypeRef)window.contentView);
+  GioView *view = (GioView *)window.contentView;
+	gio_onShow(view.handle);
 }
 - (void)windowWillEnterFullScreen:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onFullscreen((__bridge CFTypeRef)window.contentView);
+  GioView *view = (GioView *)window.contentView;
+	gio_onFullscreen(view.handle);
 }
 - (void)windowWillExitFullScreen:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onWindowed((__bridge CFTypeRef)window.contentView);
+  GioView *view = (GioView *)window.contentView;
+	gio_onWindowed(view.handle);
 }
 - (void)windowDidChangeScreen:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
 	CGDirectDisplayID dispID = [[[window screen] deviceDescription][@"NSScreenNumber"] unsignedIntValue];
-	CFTypeRef view = (__bridge CFTypeRef)window.contentView;
-	gio_onChangeScreen(view, dispID);
+  GioView *view = (GioView *)window.contentView;
+	gio_onChangeScreen(view.handle, dispID);
 }
 - (void)windowDidBecomeKey:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onFocus((__bridge CFTypeRef)window.contentView, 1);
+	GioView *view = (GioView *)window.contentView;
+	if ([window firstResponder] == view) {
+		gio_onFocus(view.handle, 1);
+	}
 }
 - (void)windowDidResignKey:(NSNotification *)notification {
 	NSWindow *window = (NSWindow *)[notification object];
-	gio_onFocus((__bridge CFTypeRef)window.contentView, 0);
-}
-- (void)windowWillClose:(NSNotification *)notification {
-	NSWindow *window = (NSWindow *)[notification object];
-	window.delegate = nil;
-	gio_onClose((__bridge CFTypeRef)window.contentView);
+	GioView *view = (GioView *)window.contentView;
+	if ([window firstResponder] == view) {
+		gio_onFocus(view.handle, 0);
+	}
 }
 @end
 
-static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFloat dy) {
+static void handleMouse(GioView *view, NSEvent *event, int typ, CGFloat dx, CGFloat dy) {
 	NSPoint p = [view convertPoint:[event locationInWindow] fromView:nil];
 	if (!event.hasPreciseScrollingDeltas) {
 		// dx and dy are in rows and columns.
@@ -61,12 +71,9 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 	}
 	// Origin is in the lower left corner. Convert to upper left.
 	CGFloat height = view.bounds.size.height;
-	gio_onMouse((__bridge CFTypeRef)view, typ, [NSEvent pressedMouseButtons], p.x, height - p.y, dx, dy, [event timestamp], [event modifierFlags]);
+	gio_onMouse(view.handle, (__bridge CFTypeRef)event, typ, event.buttonNumber, p.x, height - p.y, dx, dy, [event timestamp], [event modifierFlags]);
 }
 
-@interface GioView : NSView <CALayerDelegate,NSTextInputClient>
-@end
-
 @implementation GioView
 - (void)setFrameSize:(NSSize)newSize {
 	[super setFrameSize:newSize];
@@ -75,41 +82,50 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 // drawRect is called when OpenGL is used, displayLayer otherwise.
 // Don't know why.
 - (void)drawRect:(NSRect)r {
-	gio_onDraw((__bridge CFTypeRef)self);
+	gio_onDraw(self.handle);
 }
 - (void)displayLayer:(CALayer *)layer {
 	layer.contentsScale = self.window.backingScaleFactor;
-	gio_onDraw((__bridge CFTypeRef)self);
+	gio_onDraw(self.handle);
 }
 - (CALayer *)makeBackingLayer {
-	CALayer *layer = gio_layerFactory();
+	CALayer *layer = gio_layerFactory(self.presentWithTrans);
 	layer.delegate = self;
 	return layer;
 }
+- (void)viewDidMoveToWindow {
+	gio_onAttached(self.handle, self.window != nil ? 1 : 0);
+}
 - (void)mouseDown:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_DOWN, 0, 0);
 }
 - (void)mouseUp:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_UP, 0, 0);
 }
-- (void)middleMouseDown:(NSEvent *)event {
-	handleMouse(self, event, MOUSE_DOWN, 0, 0);
-}
-- (void)middletMouseUp:(NSEvent *)event {
-	handleMouse(self, event, MOUSE_UP, 0, 0);
-}
 - (void)rightMouseDown:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_DOWN, 0, 0);
 }
 - (void)rightMouseUp:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_UP, 0, 0);
 }
+- (void)otherMouseDown:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_DOWN, 0, 0);
+}
+- (void)otherMouseUp:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_UP, 0, 0);
+}
 - (void)mouseMoved:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_MOVE, 0, 0);
 }
 - (void)mouseDragged:(NSEvent *)event {
 	handleMouse(self, event, MOUSE_MOVE, 0, 0);
 }
+- (void)rightMouseDragged:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_MOVE, 0, 0);
+}
+- (void)otherMouseDragged:(NSEvent *)event {
+	handleMouse(self, event, MOUSE_MOVE, 0, 0);
+}
 - (void)scrollWheel:(NSEvent *)event {
 	CGFloat dx = -event.scrollingDeltaX;
 	CGFloat dy = -event.scrollingDeltaY;
@@ -118,14 +134,14 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 - (void)keyDown:(NSEvent *)event {
 	[self interpretKeyEvents:[NSArray arrayWithObject:event]];
 	NSString *keys = [event charactersIgnoringModifiers];
-	gio_onKeys((__bridge CFTypeRef)self, (__bridge CFTypeRef)keys, [event timestamp], [event modifierFlags], true);
+	gio_onKeys(self.handle, (__bridge CFTypeRef)keys, [event timestamp], [event modifierFlags], true);
 }
 - (void)keyUp:(NSEvent *)event {
 	NSString *keys = [event charactersIgnoringModifiers];
-	gio_onKeys((__bridge CFTypeRef)self, (__bridge CFTypeRef)keys, [event timestamp], [event modifierFlags], false);
+	gio_onKeys(self.handle, (__bridge CFTypeRef)keys, [event timestamp], [event modifierFlags], false);
 }
 - (void)insertText:(id)string {
-	gio_onText((__bridge CFTypeRef)self, (__bridge CFTypeRef)string);
+	gio_onText(self.handle, (__bridge CFTypeRef)string);
 }
 - (void)doCommandBySelector:(SEL)sel {
 	// Don't pass commands up the responder chain.
@@ -133,17 +149,17 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 }
 
 - (BOOL)hasMarkedText {
-	int res = gio_hasMarkedText((__bridge CFTypeRef)self);
+	int res = gio_hasMarkedText(self.handle);
 	return res ? YES : NO;
 }
 - (NSRange)markedRange {
-	return gio_markedRange((__bridge CFTypeRef)self);
+	return gio_markedRange(self.handle);
 }
 - (NSRange)selectedRange {
-	return gio_selectedRange((__bridge CFTypeRef)self);
+	return gio_selectedRange(self.handle);
 }
 - (void)unmarkText {
-	gio_unmarkText((__bridge CFTypeRef)self);
+	gio_unmarkText(self.handle);
 }
 - (void)setMarkedText:(id)string
         selectedRange:(NSRange)selRange
@@ -155,14 +171,14 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 	} else {
 		str = string;
 	}
-	gio_setMarkedText((__bridge CFTypeRef)self, (__bridge CFTypeRef)str, selRange, replaceRange);
+	gio_setMarkedText(self.handle, (__bridge CFTypeRef)str, selRange, replaceRange);
 }
 - (NSArray<NSAttributedStringKey> *)validAttributesForMarkedText {
 	return nil;
 }
 - (NSAttributedString *)attributedSubstringForProposedRange:(NSRange)range
                                                 actualRange:(NSRangePointer)actualRange {
-	NSString *str = CFBridgingRelease(gio_substringForProposedRange((__bridge CFTypeRef)self, range, actualRange));
+	NSString *str = CFBridgingRelease(gio_substringForProposedRange(self.handle, range, actualRange));
 	return [[NSAttributedString alloc] initWithString:str attributes:nil];
 }
 - (void)insertText:(id)string
@@ -174,17 +190,34 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 	} else {
 		str = string;
 	}
-	gio_insertText((__bridge CFTypeRef)self, (__bridge CFTypeRef)str, replaceRange);
+	gio_insertText(self.handle, (__bridge CFTypeRef)str, replaceRange);
 }
 - (NSUInteger)characterIndexForPoint:(NSPoint)p {
-	return gio_characterIndexForPoint((__bridge CFTypeRef)self, p);
+	return gio_characterIndexForPoint(self.handle, p);
 }
 - (NSRect)firstRectForCharacterRange:(NSRange)rng
                          actualRange:(NSRangePointer)actual {
-    NSRect r = gio_firstRectForCharacterRange((__bridge CFTypeRef)self, rng, actual);
+    NSRect r = gio_firstRectForCharacterRange(self.handle, rng, actual);
     r = [self convertRect:r toView:nil];
     return [[self window] convertRectToScreen:r];
 }
+- (void)applicationWillUnhide:(NSNotification *)notification {
+	gio_onShow(self.handle);
+}
+- (void)applicationDidHide:(NSNotification *)notification {
+	gio_onHide(self.handle);
+}
+- (void)dealloc {
+	gio_onDestroy(self.handle);
+}
+- (BOOL) becomeFirstResponder {
+	gio_onFocus(self.handle, 1);
+	return [super becomeFirstResponder];
+ }
+- (BOOL) resignFirstResponder {
+	gio_onFocus(self.handle, 0);
+	return [super resignFirstResponder];
+}
 @end
 
 // Delegates are weakly referenced from their peers. Nothing
@@ -193,14 +226,14 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 static GioWindowDelegate *globalWindowDel;
 
 static CVReturn displayLinkCallback(CVDisplayLinkRef dl, const CVTimeStamp *inNow, const CVTimeStamp *inOutputTime, CVOptionFlags flagsIn, CVOptionFlags *flagsOut, void *handle) {
-	gio_onFrameCallback(dl, (uintptr_t)handle);
+	gio_onFrameCallback(dl);
 	return kCVReturnSuccess;
 }
 
-CFTypeRef gio_createDisplayLink(uintptr_t handle) {
+CFTypeRef gio_createDisplayLink(void) {
 	CVDisplayLinkRef dl;
 	CVDisplayLinkCreateWithActiveCGDisplays(&dl);
-	CVDisplayLinkSetOutputCallback(dl, displayLinkCallback, (void *)(handle));
+	CVDisplayLinkSetOutputCallback(dl, displayLinkCallback, nil);
 	return dl;
 }
 
@@ -234,7 +267,7 @@ void gio_showCursor() {
 
 // some cursors are not public, this tries to use a private cursor
 // and uses fallback when the use of private cursor fails.
-void gio_trySetPrivateCursor(SEL cursorName, NSCursor* fallback) {
+static void trySetPrivateCursor(SEL cursorName, NSCursor* fallback) {
 	if ([NSCursor respondsToSelector:cursorName]) {
 		id object = [NSCursor performSelector:cursorName];
 		if ([object isKindOfClass:[NSCursor class]]) {
@@ -266,7 +299,7 @@ void gio_setCursor(NSUInteger curID) {
 				break;
 			case 6: // pointer.CursorAllScroll
 				// For some reason, using _moveCursor fails on Monterey.
-				// gio_trySetPrivateCursor(@selector(_moveCursor), NSCursor.arrowCursor);
+				// trySetPrivateCursor(@selector(_moveCursor), NSCursor.arrowCursor);
 				[NSCursor.arrowCursor set];
 				break;
 			case 7: // pointer.CursorColResize
@@ -276,33 +309,31 @@ void gio_setCursor(NSUInteger curID) {
 				[NSCursor.resizeUpDownCursor set];
 				break;
 			case 9: // pointer.CursorGrab
-				// [NSCursor.openHandCursor set];
-				gio_trySetPrivateCursor(@selector(openHandCursor), NSCursor.arrowCursor);
+				[NSCursor.openHandCursor set];
 				break;
 			case 10: // pointer.CursorGrabbing
-				// [NSCursor.closedHandCursor set];
-				gio_trySetPrivateCursor(@selector(closedHandCursor), NSCursor.arrowCursor);
+				[NSCursor.closedHandCursor set];
 				break;
 			case 11: // pointer.CursorNotAllowed
 				[NSCursor.operationNotAllowedCursor set];
 				break;
 			case 12: // pointer.CursorWait
-				gio_trySetPrivateCursor(@selector(busyButClickableCursor), NSCursor.arrowCursor);
+				trySetPrivateCursor(@selector(busyButClickableCursor), NSCursor.arrowCursor);
 				break;
 			case 13: // pointer.CursorProgress
-				gio_trySetPrivateCursor(@selector(busyButClickableCursor), NSCursor.arrowCursor);
+				trySetPrivateCursor(@selector(busyButClickableCursor), NSCursor.arrowCursor);
 				break;
 			case 14: // pointer.CursorNorthWestResize
-				gio_trySetPrivateCursor(@selector(_windowResizeNorthWestCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeNorthWestCursor), NSCursor.resizeUpDownCursor);
 				break;
 			case 15: // pointer.CursorNorthEastResize
-				gio_trySetPrivateCursor(@selector(_windowResizeNorthEastCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeNorthEastCursor), NSCursor.resizeUpDownCursor);
 				break;
 			case 16: // pointer.CursorSouthWestResize
-				gio_trySetPrivateCursor(@selector(_windowResizeSouthWestCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeSouthWestCursor), NSCursor.resizeUpDownCursor);
 				break;
 			case 17: // pointer.CursorSouthEastResize
-				gio_trySetPrivateCursor(@selector(_windowResizeSouthEastCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeSouthEastCursor), NSCursor.resizeUpDownCursor);
 				break;
 			case 18: // pointer.CursorNorthSouthResize
 				[NSCursor.resizeUpDownCursor set];
@@ -323,10 +354,10 @@ void gio_setCursor(NSUInteger curID) {
 				[NSCursor.resizeDownCursor set];
 				break;
 			case 24: // pointer.CursorNorthEastSouthWestResize
-				gio_trySetPrivateCursor(@selector(_windowResizeNorthEastSouthWestCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeNorthEastSouthWestCursor), NSCursor.resizeUpDownCursor);
 				break;
 			case 25: // pointer.CursorNorthWestSouthEastResize
-				gio_trySetPrivateCursor(@selector(_windowResizeNorthWestSouthEastCursor), NSCursor.resizeUpDownCursor);
+				trySetPrivateCursor(@selector(_windowResizeNorthWestSouthEastCursor), NSCursor.resizeUpDownCursor);
 				break;
 			default:
 				[NSCursor.arrowCursor set];
@@ -357,34 +388,44 @@ CFTypeRef gio_createWindow(CFTypeRef viewRef, CGFloat width, CGFloat height, CGF
 		NSView *view = (__bridge NSView *)viewRef;
 		[window setContentView:view];
 		[window makeFirstResponder:view];
-		window.releasedWhenClosed = NO;
 		window.delegate = globalWindowDel;
 		return (__bridge_retained CFTypeRef)window;
 	}
 }
 
-CFTypeRef gio_createView(void) {
+CFTypeRef gio_createView(int presentWithTrans) {
 	@autoreleasepool {
 		NSRect frame = NSMakeRect(0, 0, 0, 0);
 		GioView* view = [[GioView alloc] initWithFrame:frame];
+		view.presentWithTrans = presentWithTrans ? YES : NO;
 		view.wantsLayer = YES;
 		view.layerContentsRedrawPolicy = NSViewLayerContentsRedrawDuringViewResize;
+
+		[[NSNotificationCenter defaultCenter] addObserver:view
+												 selector:@selector(applicationWillUnhide:)
+													 name:NSApplicationWillUnhideNotification
+												   object:nil];
+		[[NSNotificationCenter defaultCenter] addObserver:view
+												 selector:@selector(applicationDidHide:)
+													 name:NSApplicationDidHideNotification
+												   object:nil];
 		return CFBridgingRetain(view);
 	}
 }
 
+void gio_viewSetHandle(CFTypeRef viewRef, uintptr_t handle) {
+	@autoreleasepool {
+		GioView *v = (__bridge GioView *)viewRef;
+		v.handle = handle;
+	}
+}
+
 @implementation GioAppDelegate
 - (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
 	[NSApp setActivationPolicy:NSApplicationActivationPolicyRegular];
 	[NSApp activateIgnoringOtherApps:YES];
 	gio_onFinishLaunching();
 }
-- (void)applicationDidHide:(NSNotification *)aNotification {
-	gio_onAppHide();
-}
-- (void)applicationWillUnhide:(NSNotification *)notification {
-	gio_onAppShow();
-}
 @end
 
 void gio_main() {

app/os_unix.go

@@ -12,13 +12,6 @@ import (
 	"gioui.org/io/pointer"
 )
 
-// ViewEvent provides handles to the underlying window objects for the
-// current display protocol.
-type ViewEvent interface {
-	implementsViewEvent()
-	ImplementsEvent()
-}
-
 type X11ViewEvent struct {
 	// Display is a pointer to the X11 Display created by XOpenDisplay.
 	Display unsafe.Pointer
@@ -28,6 +21,9 @@ type X11ViewEvent struct {
 
 func (X11ViewEvent) implementsViewEvent() {}
 func (X11ViewEvent) ImplementsEvent()     {}
+func (x X11ViewEvent) Valid() bool {
+	return x != (X11ViewEvent{})
+}
 
 type WaylandViewEvent struct {
 	// Display is the *wl_display returned by wl_display_connect.
@@ -38,6 +34,9 @@ type WaylandViewEvent struct {
 
 func (WaylandViewEvent) implementsViewEvent() {}
 func (WaylandViewEvent) ImplementsEvent()     {}
+func (w WaylandViewEvent) Valid() bool {
+	return w != (WaylandViewEvent{})
+}
 
 func osMain() {
 	select {}
@@ -49,7 +48,7 @@ type windowDriver func(*callbacks, []Option) error
 // let each driver initialize these variables with their own version of createWindow.
 var wlDriver, x11Driver windowDriver
 
-func newWindow(window *callbacks, options []Option) error {
+func newWindow(window *callbacks, options []Option) {
 	var errFirst error
 	for _, d := range []windowDriver{wlDriver, x11Driver} {
 		if d == nil {
@@ -57,16 +56,16 @@ func newWindow(window *callbacks, options []Option) error {
 		}
 		err := d(window, options)
 		if err == nil {
-			return nil
+			return
 		}
 		if errFirst == nil {
 			errFirst = err
 		}
 	}
-	if errFirst != nil {
-		return errFirst
+	if errFirst == nil {
+		errFirst = errors.New("app: no window driver available")
 	}
-	return errors.New("app: no window driver available")
+	window.ProcessEvent(DestroyEvent{Err: errFirst})
 }
 
 // xCursor contains mapping from pointer.Cursor to XCursor.

app/os_windows.go

@@ -6,6 +6,7 @@ import (
 	"errors"
 	"fmt"
 	"image"
+	"io"
 	"runtime"
 	"sort"
 	"strings"
@@ -18,30 +19,26 @@ import (
 	syscall "golang.org/x/sys/windows"
 
 	"gioui.org/app/internal/windows"
+	"gioui.org/op"
 	"gioui.org/unit"
 	gowindows "golang.org/x/sys/windows"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
 )
 
-type ViewEvent struct {
+type Win32ViewEvent struct {
 	HWND uintptr
 }
 
-type winDeltas struct {
-	width  int32
-	height int32
-}
-
 type window struct {
 	hwnd        syscall.Handle
 	hdc         syscall.Handle
 	w           *callbacks
-	stage       system.Stage
 	pointerBtns pointer.Buttons
 
 	// cursorIn tracks whether the cursor was inside the window according
@@ -54,8 +51,9 @@ type window struct {
 
 	animating bool
 
-	deltas winDeltas
-	config Config
+	borderSize image.Point
+	config     Config
+	loop       *eventLoop
 }
 
 const _WM_WAKEUP = windows.WM_USER + iota
@@ -88,36 +86,38 @@ func osMain() {
 	select {}
 }
 
-func newWindow(window *callbacks, options []Option) error {
-	cerr := make(chan error)
+func newWindow(win *callbacks, options []Option) {
+	done := make(chan struct{})
 	go func() {
 		// GetMessage and PeekMessage can filter on a window HWND, but
 		// then thread-specific messages such as WM_QUIT are ignored.
 		// Instead lock the thread so window messages arrive through
 		// unfiltered GetMessage calls.
 		runtime.LockOSThread()
-		w, err := createNativeWindow()
+
+		w := &window{
+			w: win,
+		}
+		w.loop = newEventLoop(w.w, w.wakeup)
+		w.w.SetDriver(w)
+		err := w.init()
+		done <- struct{}{}
 		if err != nil {
-			cerr <- err
+			w.ProcessEvent(DestroyEvent{Err: err})
 			return
 		}
-		cerr <- nil
 		winMap.Store(w.hwnd, w)
 		defer winMap.Delete(w.hwnd)
-		w.w = window
-		w.w.SetDriver(w)
-		w.w.Event(ViewEvent{HWND: uintptr(w.hwnd)})
+		w.ProcessEvent(Win32ViewEvent{HWND: uintptr(w.hwnd)})
 		w.Configure(options)
 		windows.SetForegroundWindow(w.hwnd)
 		windows.SetFocus(w.hwnd)
 		// Since the window class for the cursor is null,
 		// set it here to show the cursor.
 		w.SetCursor(pointer.CursorDefault)
-		if err := w.loop(); err != nil {
-			panic(err)
-		}
+		w.runLoop()
 	}()
-	return <-cerr
+	<-done
 }
 
 // initResources initializes the resources global.
@@ -150,18 +150,20 @@ func initResources() error {
 	return nil
 }
 
-func createNativeWindow() (*window, error) {
+const dwExStyle = windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE
+
+func (w *window) init() error {
 	var resErr error
 	resources.once.Do(func() {
 		resErr = initResources()
 	})
 	if resErr != nil {
-		return nil, resErr
+		return resErr
 	}
-	dwStyle := uint32(windows.WS_OVERLAPPEDWINDOW)
-	dwExStyle := uint32(windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE)
+	const dwStyle = windows.WS_OVERLAPPEDWINDOW
 
-	hwnd, err := windows.CreateWindowEx(dwExStyle,
+	hwnd, err := windows.CreateWindowEx(
+		dwExStyle,
 		resources.class,
 		"",
 		dwStyle|windows.WS_CLIPSIBLINGS|windows.WS_CLIPCHILDREN,
@@ -172,55 +174,32 @@ func createNativeWindow() (*window, error) {
 		resources.handle,
 		0)
 	if err != nil {
-		return nil, err
-	}
-	w := &window{
-		hwnd: hwnd,
+		return err
 	}
 	w.hdc, err = windows.GetDC(hwnd)
 	if err != nil {
-		return nil, err
+		windows.DestroyWindow(hwnd)
+		return err
 	}
-	return w, nil
+	w.hwnd = hwnd
+	return nil
 }
 
 // update() handles changes done by the user, and updates the configuration.
 // It reads the window style and size/position and updates w.config.
 // If anything has changed it emits a ConfigEvent to notify the application.
 func (w *window) update() {
-	var triggerEvent bool
-	r := windows.GetWindowRect(w.hwnd)
-	size := image.Point{
-		X: int(r.Right - r.Left - w.deltas.width),
-		Y: int(r.Bottom - r.Top - w.deltas.height),
+	cr := windows.GetClientRect(w.hwnd)
+	w.config.Size = image.Point{
+		X: int(cr.Right - cr.Left),
+		Y: int(cr.Bottom - cr.Top),
 	}
 
-	// Check the window mode.
-	mode := w.config.Mode
-	p := windows.GetWindowPlacement(w.hwnd)
-	style := windows.GetWindowLong(w.hwnd, windows.GWL_STYLE)
-	if style&windows.WS_OVERLAPPEDWINDOW == 0 {
-		mode = Fullscreen
-		mi := windows.GetMonitorInfo(w.hwnd).Monitor
-		size = image.Point{X: int(mi.Right - mi.Left), Y: int(mi.Bottom - mi.Top)}
-	} else if p.IsMinimized() {
-		mode = Minimized
-	} else if p.IsMaximized() {
-		mode = Maximized
-	} else {
-		mode = Windowed
-	}
-	if size != w.config.Size {
-		w.config.Size = size
-		triggerEvent = true
-	}
-	if mode != w.config.Mode {
-		w.config.Mode = mode
-		triggerEvent = true
-	}
-	if triggerEvent {
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
+	w.borderSize = image.Pt(
+		windows.GetSystemMetrics(windows.SM_CXSIZEFRAME),
+		windows.GetSystemMetrics(windows.SM_CYSIZEFRAME),
+	)
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr {
@@ -261,7 +240,7 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 				e.State = key.Release
 			}
 
-			w.w.Event(e)
+			w.ProcessEvent(e)
 
 			if (wParam == windows.VK_F10) && (msg == windows.WM_SYSKEYDOWN || msg == windows.WM_SYSKEYUP) {
 				// Reserve F10 for ourselves, and don't let it open the system menu. Other Windows programs
@@ -282,30 +261,42 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 	case windows.WM_MBUTTONUP:
 		w.pointerButton(pointer.ButtonTertiary, false, lParam, getModifiers())
 	case windows.WM_CANCELMODE:
-		w.w.Event(pointer.Event{
-			Type: pointer.Cancel,
+		w.ProcessEvent(pointer.Event{
+			Kind: pointer.Cancel,
 		})
 	case windows.WM_SETFOCUS:
-		w.w.Event(key.FocusEvent{Focus: true})
+		w.config.Focused = true
+		w.ProcessEvent(ConfigEvent{Config: w.config})
 	case windows.WM_KILLFOCUS:
-		w.w.Event(key.FocusEvent{Focus: false})
+		w.config.Focused = false
+		w.ProcessEvent(ConfigEvent{Config: w.config})
+	case windows.WM_NCHITTEST:
+		if w.config.Decorated {
+			// Let the system handle it.
+			break
+		}
+		x, y := coordsFromlParam(lParam)
+		np := windows.Point{X: int32(x), Y: int32(y)}
+		windows.ScreenToClient(w.hwnd, &np)
+		return w.hitTest(int(np.X), int(np.Y))
 	case windows.WM_MOUSEMOVE:
 		x, y := coordsFromlParam(lParam)
 		p := f32.Point{X: float32(x), Y: float32(y)}
-		w.w.Event(pointer.Event{
-			Type:     pointer.Move,
-			Source:   pointer.Mouse,
-			Position: p,
-			Buttons:  w.pointerBtns,
-			Time:     windows.GetMessageTime(),
+		w.ProcessEvent(pointer.Event{
+			Kind:      pointer.Move,
+			Source:    pointer.Mouse,
+			Position:  p,
+			Buttons:   w.pointerBtns,
+			Time:      windows.GetMessageTime(),
+			Modifiers: getModifiers(),
 		})
 	case windows.WM_MOUSEWHEEL:
-		w.scrollEvent(wParam, lParam, false)
+		w.scrollEvent(wParam, lParam, false, getModifiers())
 	case windows.WM_MOUSEHWHEEL:
-		w.scrollEvent(wParam, lParam, true)
+		w.scrollEvent(wParam, lParam, true, getModifiers())
 	case windows.WM_DESTROY:
-		w.w.Event(ViewEvent{})
-		w.w.Event(system.DestroyEvent{})
+		w.ProcessEvent(Win32ViewEvent{})
+		w.ProcessEvent(DestroyEvent{})
 		if w.hdc != 0 {
 			windows.ReleaseDC(w.hdc)
 			w.hdc = 0
@@ -313,31 +304,70 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 		// The system destroys the HWND for us.
 		w.hwnd = 0
 		windows.PostQuitMessage(0)
+	case windows.WM_NCCALCSIZE:
+		if w.config.Decorated {
+			// Let Windows handle decorations.
+			break
+		}
+		// No client areas; we draw decorations ourselves.
+		if wParam != 1 {
+			return 0
+		}
+		// lParam contains an NCCALCSIZE_PARAMS for us to adjust.
+		place := windows.GetWindowPlacement(w.hwnd)
+		if !place.IsMaximized() {
+			// Nothing do adjust.
+			return 0
+		}
+		// Adjust window position to avoid the extra padding in maximized
+		// state. See https://devblogs.microsoft.com/oldnewthing/20150304-00/?p=44543.
+		// Note that trying to do the adjustment in WM_GETMINMAXINFO is ignored by Windows.
+		szp := (*windows.NCCalcSizeParams)(unsafe.Pointer(lParam))
+		mi := windows.GetMonitorInfo(w.hwnd)
+		szp.Rgrc[0] = mi.WorkArea
+		return 0
+	case windows.WM_NCLBUTTONDBLCLK:
+		if !w.config.Decorated {
+			// Override Windows behaviour when we
+			// draw decorations.
+			return 0
+		}
 	case windows.WM_PAINT:
 		w.draw(true)
 	case windows.WM_SIZE:
+		w.update()
 		switch wParam {
 		case windows.SIZE_MINIMIZED:
-			w.update()
-			w.setStage(system.StagePaused)
-		case windows.SIZE_MAXIMIZED, windows.SIZE_RESTORED:
-			w.update()
-			w.setStage(system.StageRunning)
+			w.config.Mode = Minimized
+		case windows.SIZE_MAXIMIZED:
+			w.config.Mode = Maximized
+		case windows.SIZE_RESTORED:
+			if w.config.Mode != Fullscreen {
+				w.config.Mode = Windowed
+			}
 		}
 	case windows.WM_GETMINMAXINFO:
-		mm := (*windows.MinMaxInfo)(unsafe.Pointer(uintptr(lParam)))
+		mm := (*windows.MinMaxInfo)(unsafe.Pointer(lParam))
+		var bw, bh int32
+		if w.config.Decorated {
+			r := windows.GetWindowRect(w.hwnd)
+			cr := windows.GetClientRect(w.hwnd)
+			bw = r.Right - r.Left - (cr.Right - cr.Left)
+			bh = r.Bottom - r.Top - (cr.Bottom - cr.Top)
+		}
 		if p := w.config.MinSize; p.X > 0 || p.Y > 0 {
 			mm.PtMinTrackSize = windows.Point{
-				X: int32(p.X) + w.deltas.width,
-				Y: int32(p.Y) + w.deltas.height,
+				X: int32(p.X) + bw,
+				Y: int32(p.Y) + bh,
 			}
 		}
 		if p := w.config.MaxSize; p.X > 0 || p.Y > 0 {
 			mm.PtMaxTrackSize = windows.Point{
-				X: int32(p.X) + w.deltas.width,
-				Y: int32(p.Y) + w.deltas.height,
+				X: int32(p.X) + bw,
+				Y: int32(p.Y) + bh,
 			}
 		}
+		return 0
 	case windows.WM_SETCURSOR:
 		w.cursorIn = (lParam & 0xffff) == windows.HTCLIENT
 		if w.cursorIn {
@@ -345,7 +375,8 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 			return windows.TRUE
 		}
 	case _WM_WAKEUP:
-		w.w.Event(wakeupEvent{})
+		w.loop.Wakeup()
+		w.loop.FlushEvents()
 	case windows.WM_IME_STARTCOMPOSITION:
 		imc := windows.ImmGetContext(w.hwnd)
 		if imc == 0 {
@@ -390,11 +421,12 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 			comp.Start = state.RunesIndex(state.UTF16Index(comp.Start) + start)
 		}
 		w.w.SetComposingRegion(comp)
+		pos := end
 		if lParam&windows.GCS_CURSORPOS != 0 {
 			rel := windows.ImmGetCompositionValue(imc, windows.GCS_CURSORPOS)
-			pos := state.RunesIndex(state.UTF16Index(rng.Start) + rel)
-			w.w.SetEditorSelection(key.Range{Start: pos, End: pos})
+			pos = state.RunesIndex(state.UTF16Index(rng.Start) + rel)
 		}
+		w.w.SetEditorSelection(key.Range{Start: pos, End: pos})
 		return windows.TRUE
 	case windows.WM_IME_ENDCOMPOSITION:
 		w.w.SetComposingRegion(key.Range{Start: -1, End: -1})
@@ -421,16 +453,62 @@ func getModifiers() key.Modifiers {
 	return kmods
 }
 
+// hitTest returns the non-client area hit by the point, needed to
+// process WM_NCHITTEST.
+func (w *window) hitTest(x, y int) uintptr {
+	if w.config.Mode == Fullscreen {
+		return windows.HTCLIENT
+	}
+	if w.config.Mode != Windowed {
+		// Only windowed mode should allow resizing.
+		return windows.HTCLIENT
+	}
+	// Check for resize handle before system actions; otherwise it can be impossible to
+	// resize a custom-decorations window when the system move area is flush with the
+	// edge of the window.
+	top := y <= w.borderSize.Y
+	bottom := y >= w.config.Size.Y-w.borderSize.Y
+	left := x <= w.borderSize.X
+	right := x >= w.config.Size.X-w.borderSize.X
+	switch {
+	case top && left:
+		return windows.HTTOPLEFT
+	case top && right:
+		return windows.HTTOPRIGHT
+	case bottom && left:
+		return windows.HTBOTTOMLEFT
+	case bottom && right:
+		return windows.HTBOTTOMRIGHT
+	case top:
+		return windows.HTTOP
+	case bottom:
+		return windows.HTBOTTOM
+	case left:
+		return windows.HTLEFT
+	case right:
+		return windows.HTRIGHT
+	}
+	p := f32.Pt(float32(x), float32(y))
+	if a, ok := w.w.ActionAt(p); ok && a == system.ActionMove {
+		return windows.HTCAPTION
+	}
+	return windows.HTCLIENT
+}
+
 func (w *window) pointerButton(btn pointer.Buttons, press bool, lParam uintptr, kmods key.Modifiers) {
-	var typ pointer.Type
+	if !w.config.Focused {
+		windows.SetFocus(w.hwnd)
+	}
+
+	var kind pointer.Kind
 	if press {
-		typ = pointer.Press
+		kind = pointer.Press
 		if w.pointerBtns == 0 {
 			windows.SetCapture(w.hwnd)
 		}
 		w.pointerBtns |= btn
 	} else {
-		typ = pointer.Release
+		kind = pointer.Release
 		w.pointerBtns &^= btn
 		if w.pointerBtns == 0 {
 			windows.ReleaseCapture()
@@ -438,8 +516,8 @@ func (w *window) pointerButton(btn pointer.Buttons, press bool, lParam uintptr,
 	}
 	x, y := coordsFromlParam(lParam)
 	p := f32.Point{X: float32(x), Y: float32(y)}
-	w.w.Event(pointer.Event{
-		Type:      typ,
+	w.ProcessEvent(pointer.Event{
+		Kind:      kind,
 		Source:    pointer.Mouse,
 		Position:  p,
 		Buttons:   w.pointerBtns,
@@ -454,7 +532,7 @@ func coordsFromlParam(lParam uintptr) (int, int) {
 	return x, y
 }
 
-func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool) {
+func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool, kmods key.Modifiers) {
 	x, y := coordsFromlParam(lParam)
 	// The WM_MOUSEWHEEL coordinates are in screen coordinates, in contrast
 	// to other mouse events.
@@ -466,20 +544,26 @@ func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool) {
 	if horizontal {
 		sp.X = dist
 	} else {
-		sp.Y = -dist
+		// support horizontal scroll (shift + mousewheel)
+		if kmods == key.ModShift {
+			sp.X = -dist
+		} else {
+			sp.Y = -dist
+		}
 	}
-	w.w.Event(pointer.Event{
-		Type:     pointer.Scroll,
-		Source:   pointer.Mouse,
-		Position: p,
-		Buttons:  w.pointerBtns,
-		Scroll:   sp,
-		Time:     windows.GetMessageTime(),
+	w.ProcessEvent(pointer.Event{
+		Kind:      pointer.Scroll,
+		Source:    pointer.Mouse,
+		Position:  p,
+		Buttons:   w.pointerBtns,
+		Scroll:    sp,
+		Modifiers: kmods,
+		Time:      windows.GetMessageTime(),
 	})
 }
 
 // Adapted from https://blogs.msdn.microsoft.com/oldnewthing/20060126-00/?p=32513/
-func (w *window) loop() error {
+func (w *window) runLoop() {
 	msg := new(windows.Msg)
 loop:
 	for {
@@ -490,7 +574,7 @@ loop:
 		}
 		switch ret := windows.GetMessage(msg, 0, 0, 0); ret {
 		case -1:
-			return errors.New("GetMessage failed")
+			panic(errors.New("GetMessage failed"))
 		case 0:
 			// WM_QUIT received.
 			break loop
@@ -498,7 +582,6 @@ loop:
 		windows.TranslateMessage(msg)
 		windows.DispatchMessage(msg)
 	}
-	return nil
 }
 
 func (w *window) EditorStateChanged(old, new editorState) {
@@ -516,16 +599,30 @@ func (w *window) SetAnimating(anim bool) {
 	w.animating = anim
 }
 
-func (w *window) Wakeup() {
-	if err := windows.PostMessage(w.hwnd, _WM_WAKEUP, 0, 0); err != nil {
-		panic(err)
-	}
+func (w *window) ProcessEvent(e event.Event) {
+	w.w.ProcessEvent(e)
+	w.loop.FlushEvents()
 }
 
-func (w *window) setStage(s system.Stage) {
-	if s != w.stage {
-		w.stage = s
-		w.w.Event(system.StageEvent{Stage: s})
+func (w *window) Event() event.Event {
+	return w.loop.Event()
+}
+
+func (w *window) Invalidate() {
+	w.loop.Invalidate()
+}
+
+func (w *window) Run(f func()) {
+	w.loop.Run(f)
+}
+
+func (w *window) Frame(frame *op.Ops) {
+	w.loop.Frame(frame)
+}
+
+func (w *window) wakeup() {
+	if err := windows.PostMessage(w.hwnd, _WM_WAKEUP, 0, 0); err != nil {
+		panic(err)
 	}
 }
 
@@ -535,8 +632,8 @@ func (w *window) draw(sync bool) {
 	}
 	dpi := windows.GetWindowDPI(w.hwnd)
 	cfg := configForDPI(dpi)
-	w.w.Event(frameEvent{
-		FrameEvent: system.FrameEvent{
+	w.ProcessEvent(frameEvent{
+		FrameEvent: FrameEvent{
 			Now:    time.Now(),
 			Size:   w.config.Size,
 			Metric: cfg,
@@ -582,87 +679,81 @@ func (w *window) readClipboard() error {
 	}
 	defer windows.GlobalUnlock(mem)
 	content := gowindows.UTF16PtrToString((*uint16)(unsafe.Pointer(ptr)))
-	w.w.Event(clipboard.Event{Text: content})
+	w.ProcessEvent(transfer.DataEvent{
+		Type: "application/text",
+		Open: func() io.ReadCloser {
+			return io.NopCloser(strings.NewReader(content))
+		},
+	})
 	return nil
 }
 
 func (w *window) Configure(options []Option) {
-	oldConfig := w.config
 	dpi := windows.GetSystemDPI()
 	metric := configForDPI(dpi)
 	w.config.apply(metric, options)
 	windows.SetWindowText(w.hwnd, w.config.Title)
-	// Decorations are never disabled.
-	w.config.Decorated = true
 
+	style := windows.GetWindowLong(w.hwnd, windows.GWL_STYLE)
+	var showMode int32
+	var x, y, width, height int32
+	swpStyle := uintptr(windows.SWP_NOZORDER | windows.SWP_FRAMECHANGED)
+	winStyle := uintptr(windows.WS_OVERLAPPEDWINDOW)
+	style &^= winStyle
 	switch w.config.Mode {
 	case Minimized:
-		windows.ShowWindow(w.hwnd, windows.SW_SHOWMINIMIZED)
+		style |= winStyle
+		swpStyle |= windows.SWP_NOMOVE | windows.SWP_NOSIZE
+		showMode = windows.SW_SHOWMINIMIZED
 
 	case Maximized:
-		// Set window style.
-		style := windows.GetWindowLong(w.hwnd, windows.GWL_STYLE) & (^uintptr(windows.WS_MAXIMIZE))
-		windows.SetWindowLong(w.hwnd, windows.GWL_STYLE, style|windows.WS_OVERLAPPEDWINDOW)
-		mi := windows.GetMonitorInfo(w.hwnd).Monitor
-		w.config.Size = image.Point{X: int(mi.Right - mi.Left), Y: int(mi.Bottom - mi.Top)}
-		windows.ShowWindow(w.hwnd, windows.SW_SHOWMAXIMIZED)
+		style |= winStyle
+		swpStyle |= windows.SWP_NOMOVE | windows.SWP_NOSIZE
+		showMode = windows.SW_SHOWMAXIMIZED
 
 	case Windowed:
-		windows.SetWindowText(w.hwnd, w.config.Title)
-		// Set window style.
-		style := windows.GetWindowLong(w.hwnd, windows.GWL_STYLE) & (^uintptr(windows.WS_MAXIMIZE))
-		windows.SetWindowLong(w.hwnd, windows.GWL_STYLE, style|windows.WS_OVERLAPPEDWINDOW)
-		// Get target for client areaa size.
-		width := int32(w.config.Size.X)
-		height := int32(w.config.Size.Y)
+		style |= winStyle
+		showMode = windows.SW_SHOWNORMAL
+		// Get target for client area size.
+		width = int32(w.config.Size.X)
+		height = int32(w.config.Size.Y)
 		// Get the current window size and position.
 		wr := windows.GetWindowRect(w.hwnd)
-		// Set desired window size.
-		wr.Right = wr.Left + width
-		wr.Bottom = wr.Top + height
-		// Convert from client size to window size.
-		r := wr
-		windows.AdjustWindowRectEx(&r, windows.WS_OVERLAPPEDWINDOW, 0, windows.WS_EX_APPWINDOW|windows.WS_EX_WINDOWEDGE)
-		// Calculate difference between client and full window sizes.
-		w.deltas.width = r.Right - wr.Right + wr.Left - r.Left
-		w.deltas.height = r.Bottom - wr.Bottom + wr.Top - r.Top
-		// Set new window size and position.
-		x := wr.Left
-		y := wr.Top
-		dx := r.Right - r.Left
-		dy := r.Bottom - r.Top
-		if w.config.center {
-			// Calculate center position on current monitor.
-			mi := windows.GetMonitorInfo(w.hwnd).Monitor
-			x = (mi.Right - mi.Left - dx) / 2
-			y = (mi.Bottom - mi.Top - dy) / 2
-			// Centering is done only once.
-			w.config.center = false
+		x = wr.Left
+		y = wr.Top
+		if w.config.Decorated {
+			// Compute client size and position. Note that the client size is
+			// equal to the window size when we are in control of decorations.
+			r := windows.Rect{
+				Right:  width,
+				Bottom: height,
+			}
+			windows.AdjustWindowRectEx(&r, uint32(style), 0, dwExStyle)
+			width = r.Right - r.Left
+			height = r.Bottom - r.Top
+		}
+		if !w.config.Decorated {
+			// Enable drop shadows when we draw decorations.
+			windows.DwmExtendFrameIntoClientArea(w.hwnd, windows.Margins{-1, -1, -1, -1})
 		}
-		windows.SetWindowPos(w.hwnd, 0, x, y, dx, dy, windows.SWP_NOOWNERZORDER|windows.SWP_FRAMECHANGED)
-		windows.ShowWindow(w.hwnd, windows.SW_SHOWNORMAL)
 
 	case Fullscreen:
-		style := windows.GetWindowLong(w.hwnd, windows.GWL_STYLE)
-		windows.SetWindowLong(w.hwnd, windows.GWL_STYLE, style&^windows.WS_OVERLAPPEDWINDOW)
+		swpStyle |= windows.SWP_NOMOVE | windows.SWP_NOSIZE
 		mi := windows.GetMonitorInfo(w.hwnd)
-		w.config.Size = image.Point{X: int(mi.Monitor.Right - mi.Monitor.Left), Y: int(mi.Monitor.Bottom - mi.Monitor.Top)}
-		windows.SetWindowPos(w.hwnd, 0,
-			mi.Monitor.Left, mi.Monitor.Top,
-			mi.Monitor.Right-mi.Monitor.Left,
-			mi.Monitor.Bottom-mi.Monitor.Top,
-			windows.SWP_NOOWNERZORDER|windows.SWP_FRAMECHANGED,
-		)
-		windows.ShowWindow(w.hwnd, windows.SW_SHOW)
-	}
-	// A config event is sent to the main event loop whenever the configuration is changed
-	if oldConfig != w.config {
-		w.w.Event(ConfigEvent{Config: w.config})
+		x, y = mi.Monitor.Left, mi.Monitor.Top
+		width = mi.Monitor.Right - mi.Monitor.Left
+		height = mi.Monitor.Bottom - mi.Monitor.Top
+		showMode = windows.SW_SHOWMAXIMIZED
 	}
+	windows.SetWindowLong(w.hwnd, windows.GWL_STYLE, style)
+	windows.SetWindowPos(w.hwnd, 0, x, y, width, height, swpStyle)
+	windows.ShowWindow(w.hwnd, showMode)
+
+	w.update()
 }
 
-func (w *window) WriteClipboard(s string) {
-	w.writeClipboard(s)
+func (w *window) WriteClipboard(mime string, s []byte) {
+	w.writeClipboard(string(s))
 }
 
 func (w *window) writeClipboard(s string) error {
@@ -761,23 +852,40 @@ func (w *window) HWND() (syscall.Handle, int, int) {
 	return w.hwnd, w.config.Size.X, w.config.Size.Y
 }
 
-func (w *window) Close() {
-	windows.PostMessage(w.hwnd, windows.WM_CLOSE, 0, 0)
+func (w *window) Perform(acts system.Action) {
+	walkActions(acts, func(a system.Action) {
+		switch a {
+		case system.ActionCenter:
+			if w.config.Mode != Windowed {
+				break
+			}
+			r := windows.GetWindowRect(w.hwnd)
+			dx := r.Right - r.Left
+			dy := r.Bottom - r.Top
+			// Calculate center position on current monitor.
+			mi := windows.GetMonitorInfo(w.hwnd).Monitor
+			x := (mi.Right - mi.Left - dx) / 2
+			y := (mi.Bottom - mi.Top - dy) / 2
+			windows.SetWindowPos(w.hwnd, 0, x, y, dx, dy, windows.SWP_NOZORDER|windows.SWP_FRAMECHANGED)
+		case system.ActionRaise:
+			w.raise()
+		case system.ActionClose:
+			windows.PostMessage(w.hwnd, windows.WM_CLOSE, 0, 0)
+		}
+	})
 }
 
-func (w *window) Perform(system.Action) {}
-
-func (w *window) Raise() {
+func (w *window) raise() {
 	windows.SetForegroundWindow(w.hwnd)
 	windows.SetWindowPos(w.hwnd, windows.HWND_TOPMOST, 0, 0, 0, 0,
 		windows.SWP_NOMOVE|windows.SWP_NOSIZE|windows.SWP_SHOWWINDOW)
 }
 
-func convertKeyCode(code uintptr) (string, bool) {
+func convertKeyCode(code uintptr) (key.Name, bool) {
 	if '0' <= code && code <= '9' || 'A' <= code && code <= 'Z' {
-		return string(rune(code)), true
+		return key.Name(rune(code)), true
 	}
-	var r string
+	var r key.Name
 
 	switch code {
 	case windows.VK_ESCAPE:
@@ -877,4 +985,8 @@ func configForDPI(dpi int) unit.Metric {
 	}
 }
 
-func (_ ViewEvent) ImplementsEvent() {}
+func (Win32ViewEvent) implementsViewEvent() {}
+func (Win32ViewEvent) ImplementsEvent()     {}
+func (w Win32ViewEvent) Valid() bool {
+	return w != (Win32ViewEvent{})
+}

app/os_x11.go

@@ -30,18 +30,20 @@ import (
 	"errors"
 	"fmt"
 	"image"
-	"os"
-	"path/filepath"
+	"io"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 	"unsafe"
 
 	"gioui.org/f32"
-	"gioui.org/io/clipboard"
+	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/io/system"
+	"gioui.org/io/transfer"
+	"gioui.org/op"
 	"gioui.org/unit"
 
 	syscall "golang.org/x/sys/unix"
@@ -93,12 +95,10 @@ type x11Window struct {
 		// _NET_WM_STATE_MAXIMIZED_VERT
 		wmStateMaximizedVert C.Atom
 	}
-	stage  system.Stage
 	metric unit.Metric
 	notify struct {
 		read, write int
 	}
-	dead bool
 
 	animating bool
 
@@ -111,6 +111,8 @@ type x11Window struct {
 	config Config
 
 	wakeups chan struct{}
+	handler x11EventHandler
+	buf     [100]byte
 }
 
 var (
@@ -153,8 +155,8 @@ func (w *x11Window) ReadClipboard() {
 	C.XConvertSelection(w.x, w.atoms.clipboard, w.atoms.utf8string, w.atoms.clipboardContent, w.xw, C.CurrentTime)
 }
 
-func (w *x11Window) WriteClipboard(s string) {
-	w.clipboard.content = []byte(s)
+func (w *x11Window) WriteClipboard(mime string, s []byte) {
+	w.clipboard.content = s
 	C.XSetSelectionOwner(w.x, w.atoms.clipboard, w.xw, C.CurrentTime)
 	C.XSetSelectionOwner(w.x, w.atoms.primary, w.xw, C.CurrentTime)
 }
@@ -172,7 +174,7 @@ func (w *x11Window) Configure(options []Option) {
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			w.Raise()
+			w.raise()
 			fallthrough
 		default:
 			w.config.Mode = Fullscreen
@@ -190,7 +192,7 @@ func (w *x11Window) Configure(options []Option) {
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			w.Raise()
+			w.raise()
 			fallthrough
 		default:
 			w.config.Mode = Maximized
@@ -205,7 +207,7 @@ func (w *x11Window) Configure(options []Option) {
 			C.XResizeWindow(w.x, w.xw, C.uint(cnf.Size.X), C.uint(cnf.Size.Y))
 		case Minimized:
 			w.config.Mode = Windowed
-			w.Raise()
+			w.raise()
 		case Maximized:
 			w.config.Mode = Windowed
 			w.sendWMStateEvent(_NET_WM_STATE_REMOVE, w.atoms.wmStateMaximizedHorz, w.atoms.wmStateMaximizedVert)
@@ -230,29 +232,11 @@ func (w *x11Window) Configure(options []Option) {
 		if shints.flags != 0 {
 			C.XSetWMNormalHints(w.x, w.xw, &shints)
 		}
-		if cnf.center {
-			screen := C.XDefaultScreen(w.x)
-			width := C.XDisplayWidth(w.x, screen)
-			height := C.XDisplayHeight(w.x, screen)
-
-			var attrs C.XWindowAttributes
-			C.XGetWindowAttributes(w.x, w.xw, &attrs)
-			width -= attrs.border_width
-			height -= attrs.border_width
-
-			sz := w.config.Size
-			x := (int(width) - sz.X) / 2
-			y := (int(height) - sz.Y) / 2
-
-			C.XMoveResizeWindow(w.x, w.xw, C.int(x), C.int(y), C.uint(sz.X), C.uint(sz.Y))
-		}
 	}
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	if w.config != prev {
-		w.w.Event(ConfigEvent{Config: w.config})
-	}
+	w.ProcessEvent(ConfigEvent{Config: w.config})
 }
 
 func (w *x11Window) setTitle(prev, cnf Config) {
@@ -273,9 +257,38 @@ func (w *x11Window) setTitle(prev, cnf Config) {
 	}
 }
 
-func (w *x11Window) Perform(system.Action) {}
+func (w *x11Window) Perform(acts system.Action) {
+	walkActions(acts, func(a system.Action) {
+		switch a {
+		case system.ActionCenter:
+			w.center()
+		case system.ActionRaise:
+			w.raise()
+		}
+	})
+	if acts&system.ActionClose != 0 {
+		w.close()
+	}
+}
 
-func (w *x11Window) Raise() {
+func (w *x11Window) center() {
+	screen := C.XDefaultScreen(w.x)
+	width := C.XDisplayWidth(w.x, screen)
+	height := C.XDisplayHeight(w.x, screen)
+
+	var attrs C.XWindowAttributes
+	C.XGetWindowAttributes(w.x, w.xw, &attrs)
+	width -= attrs.border_width
+	height -= attrs.border_width
+
+	sz := w.config.Size
+	x := (int(width) - sz.X) / 2
+	y := (int(height) - sz.Y) / 2
+
+	C.XMoveResizeWindow(w.x, w.xw, C.int(x), C.int(y), C.uint(sz.X), C.uint(sz.Y))
+}
+
+func (w *x11Window) raise() {
 	var xev C.XEvent
 	ev := (*C.XClientMessageEvent)(unsafe.Pointer(&xev))
 	*ev = C.XClientMessageEvent{
@@ -321,8 +334,8 @@ func (w *x11Window) SetInputHint(_ key.InputHint) {}
 
 func (w *x11Window) EditorStateChanged(old, new editorState) {}
 
-// Close the window.
-func (w *x11Window) Close() {
+// close the window.
+func (w *x11Window) close() {
 	var xev C.XEvent
 	ev := (*C.XClientMessageEvent)(unsafe.Pointer(&xev))
 	*ev = C.XClientMessageEvent{
@@ -366,7 +379,36 @@ func (w *x11Window) sendWMStateEvent(action C.long, atom1, atom2 C.ulong) {
 
 var x11OneByte = make([]byte, 1)
 
-func (w *x11Window) Wakeup() {
+func (w *x11Window) ProcessEvent(e event.Event) {
+	w.w.ProcessEvent(e)
+}
+
+func (w *x11Window) shutdown(err error) {
+	w.ProcessEvent(X11ViewEvent{})
+	w.ProcessEvent(DestroyEvent{Err: err})
+	w.destroy()
+}
+
+func (w *x11Window) Event() event.Event {
+	for {
+		evt, ok := w.w.nextEvent()
+		if !ok {
+			w.dispatch()
+			continue
+		}
+		return evt
+	}
+}
+
+func (w *x11Window) Run(f func()) {
+	f()
+}
+
+func (w *x11Window) Frame(frame *op.Ops) {
+	w.w.ProcessFrame(frame, nil)
+}
+
+func (w *x11Window) Invalidate() {
 	select {
 	case w.wakeups <- struct{}{}:
 	default:
@@ -384,16 +426,20 @@ func (w *x11Window) window() (C.Window, int, int) {
 	return w.xw, w.config.Size.X, w.config.Size.Y
 }
 
-func (w *x11Window) setStage(s system.Stage) {
-	if s == w.stage {
+func (w *x11Window) dispatch() {
+	if w.x == nil {
+		// Only Invalidate can wake us up.
+		<-w.wakeups
+		w.w.Invalidate()
 		return
 	}
-	w.stage = s
-	w.w.Event(system.StageEvent{Stage: s})
-}
 
-func (w *x11Window) loop() {
-	h := x11EventHandler{w: w, xev: new(C.XEvent), text: make([]byte, 4)}
+	select {
+	case <-w.wakeups:
+		w.w.Invalidate()
+	default:
+	}
+
 	xfd := C.XConnectionNumber(w.x)
 
 	// Poll for events and notifications.
@@ -403,62 +449,55 @@ func (w *x11Window) loop() {
 	}
 	xEvents := &pollfds[0].Revents
 	// Plenty of room for a backlog of notifications.
-	buf := make([]byte, 100)
 
-loop:
-	for !w.dead {
-		var syn, anim bool
-		// Check for pending draw events before checking animation or blocking.
-		// This fixes an issue on Xephyr where on startup XPending() > 0 but
-		// poll will still block. This also prevents no-op calls to poll.
-		if syn = h.handleEvents(); !syn {
-			anim = w.animating
-			if !anim {
-				// Clear poll events.
-				*xEvents = 0
-				// Wait for X event or gio notification.
-				if _, err := syscall.Poll(pollfds, -1); err != nil && err != syscall.EINTR {
-					panic(fmt.Errorf("x11 loop: poll failed: %w", err))
-				}
-				switch {
-				case *xEvents&syscall.POLLIN != 0:
-					syn = h.handleEvents()
-					if w.dead {
-						break loop
-					}
-				case *xEvents&(syscall.POLLERR|syscall.POLLHUP) != 0:
-					break loop
+	var syn, anim bool
+	// Check for pending draw events before checking animation or blocking.
+	// This fixes an issue on Xephyr where on startup XPending() > 0 but
+	// poll will still block. This also prevents no-op calls to poll.
+	syn = w.handler.handleEvents()
+	if w.x == nil {
+		// handleEvents received a close request and destroyed the window.
+		return
+	}
+	if !syn {
+		anim = w.animating
+		if !anim {
+			// Clear poll events.
+			*xEvents = 0
+			// Wait for X event or gio notification.
+			if _, err := syscall.Poll(pollfds, -1); err != nil && err != syscall.EINTR {
+				panic(fmt.Errorf("x11 loop: poll failed: %w", err))
+			}
+			switch {
+			case *xEvents&syscall.POLLIN != 0:
+				syn = w.handler.handleEvents()
+				if w.x == nil {
+					return
 				}
+			case *xEvents&(syscall.POLLERR|syscall.POLLHUP) != 0:
 			}
 		}
-		// Clear notifications.
-		for {
-			_, err := syscall.Read(w.notify.read, buf)
-			if err == syscall.EAGAIN {
-				break
-			}
-			if err != nil {
-				panic(fmt.Errorf("x11 loop: read from notify pipe failed: %w", err))
-			}
-		}
-		select {
-		case <-w.wakeups:
-			w.w.Event(wakeupEvent{})
-		default:
-		}
-
-		if (anim || syn) && w.config.Size.X != 0 && w.config.Size.Y != 0 {
-			w.w.Event(frameEvent{
-				FrameEvent: system.FrameEvent{
-					Now:    time.Now(),
-					Size:   w.config.Size,
-					Metric: w.metric,
-				},
-				Sync: syn,
-			})
-		}
 	}
-	w.w.Event(system.DestroyEvent{Err: nil})
+	// Clear notifications.
+	for {
+		_, err := syscall.Read(w.notify.read, w.buf[:])
+		if err == syscall.EAGAIN {
+			break
+		}
+		if err != nil {
+			panic(fmt.Errorf("x11 loop: read from notify pipe failed: %w", err))
+		}
+	}
+	if (anim || syn) && w.config.Size.X != 0 && w.config.Size.Y != 0 {
+		w.ProcessEvent(frameEvent{
+			FrameEvent: FrameEvent{
+				Now:    time.Now(),
+				Size:   w.config.Size,
+				Metric: w.metric,
+			},
+			Sync: syn,
+		})
+	}
 }
 
 func (w *x11Window) destroy() {
@@ -476,11 +515,11 @@ func (w *x11Window) destroy() {
 	}
 	C.XDestroyWindow(w.x, w.xw)
 	C.XCloseDisplay(w.x)
+	w.x = nil
 }
 
 // atom is a wrapper around XInternAtom. Callers should cache the result
 // in order to limit round-trips to the X server.
-//
 func (w *x11Window) atom(name string, onlyIfExists bool) C.Atom {
 	cname := C.CString(name)
 	defer C.free(unsafe.Pointer(cname))
@@ -494,7 +533,6 @@ func (w *x11Window) atom(name string, onlyIfExists bool) C.Atom {
 // x11EventHandler wraps static variables for the main event loop.
 // Its sole purpose is to prevent heap allocation and reduce clutter
 // in x11window.loop.
-//
 type x11EventHandler struct {
 	w    *x11Window
 	text []byte
@@ -502,7 +540,6 @@ type x11EventHandler struct {
 }
 
 // handleEvents returns true if the window needs to be redrawn.
-//
 func (h *x11EventHandler) handleEvents() bool {
 	w := h.w
 	xev := h.xev
@@ -536,13 +573,13 @@ func (h *x11EventHandler) handleEvents() bool {
 					// There's no support for IME yet.
 					w.w.EditorInsert(ee.Text)
 				} else {
-					w.w.Event(e)
+					w.ProcessEvent(e)
 				}
 			}
 		case C.ButtonPress, C.ButtonRelease:
 			bevt := (*C.XButtonEvent)(unsafe.Pointer(xev))
 			ev := pointer.Event{
-				Type:   pointer.Press,
+				Kind:   pointer.Press,
 				Source: pointer.Mouse,
 				Position: f32.Point{
 					X: float32(bevt.x),
@@ -552,7 +589,7 @@ func (h *x11EventHandler) handleEvents() bool {
 				Modifiers: w.xkb.Modifiers(),
 			}
 			if bevt._type == C.ButtonRelease {
-				ev.Type = pointer.Release
+				ev.Kind = pointer.Release
 			}
 			var btn pointer.Buttons
 			const scrollScale = 10
@@ -564,21 +601,29 @@ func (h *x11EventHandler) handleEvents() bool {
 			case C.Button3:
 				btn = pointer.ButtonSecondary
 			case C.Button4:
-				// scroll up
-				ev.Type = pointer.Scroll
-				ev.Scroll.Y = -scrollScale
+				ev.Kind = pointer.Scroll
+				// scroll up or left (if shift is pressed).
+				if ev.Modifiers == key.ModShift {
+					ev.Scroll.X = -scrollScale
+				} else {
+					ev.Scroll.Y = -scrollScale
+				}
 			case C.Button5:
-				// scroll down
-				ev.Type = pointer.Scroll
-				ev.Scroll.Y = +scrollScale
+				// scroll down or right (if shift is pressed).
+				ev.Kind = pointer.Scroll
+				if ev.Modifiers == key.ModShift {
+					ev.Scroll.X = +scrollScale
+				} else {
+					ev.Scroll.Y = +scrollScale
+				}
 			case 6:
 				// http://xahlee.info/linux/linux_x11_mouse_button_number.html
-				// scroll left
-				ev.Type = pointer.Scroll
+				// scroll left.
+				ev.Kind = pointer.Scroll
 				ev.Scroll.X = -scrollScale * 2
 			case 7:
 				// scroll right
-				ev.Type = pointer.Scroll
+				ev.Kind = pointer.Scroll
 				ev.Scroll.X = +scrollScale * 2
 			default:
 				continue
@@ -590,11 +635,11 @@ func (h *x11EventHandler) handleEvents() bool {
 				w.pointerBtns &^= btn
 			}
 			ev.Buttons = w.pointerBtns
-			w.w.Event(ev)
+			w.ProcessEvent(ev)
 		case C.MotionNotify:
 			mevt := (*C.XMotionEvent)(unsafe.Pointer(xev))
-			w.w.Event(pointer.Event{
-				Type:    pointer.Move,
+			w.ProcessEvent(pointer.Event{
+				Kind:    pointer.Move,
 				Source:  pointer.Mouse,
 				Buttons: w.pointerBtns,
 				Position: f32.Point{
@@ -608,14 +653,16 @@ func (h *x11EventHandler) handleEvents() bool {
 			// redraw only on the last expose event
 			redraw = (*C.XExposeEvent)(unsafe.Pointer(xev)).count == 0
 		case C.FocusIn:
-			w.w.Event(key.FocusEvent{Focus: true})
+			w.config.Focused = true
+			w.ProcessEvent(ConfigEvent{Config: w.config})
 		case C.FocusOut:
-			w.w.Event(key.FocusEvent{Focus: false})
+			w.config.Focused = false
+			w.ProcessEvent(ConfigEvent{Config: w.config})
 		case C.ConfigureNotify: // window configuration change
 			cevt := (*C.XConfigureEvent)(unsafe.Pointer(xev))
 			if sz := image.Pt(int(cevt.width), int(cevt.height)); sz != w.config.Size {
 				w.config.Size = sz
-				w.w.Event(ConfigEvent{Config: w.config})
+				w.ProcessEvent(ConfigEvent{Config: w.config})
 			}
 			// redraw will be done by a later expose event
 		case C.SelectionNotify:
@@ -637,7 +684,12 @@ func (h *x11EventHandler) handleEvents() bool {
 				break
 			}
 			str := C.GoStringN((*C.char)(unsafe.Pointer(text.value)), C.int(text.nitems))
-			w.w.Event(clipboard.Event{Text: str})
+			w.ProcessEvent(transfer.DataEvent{
+				Type: "application/text",
+				Open: func() io.ReadCloser {
+					return io.NopCloser(strings.NewReader(str))
+				},
+			})
 		case C.SelectionRequest:
 			cevt := (*C.XSelectionRequestEvent)(unsafe.Pointer(xev))
 			if (cevt.selection != w.atoms.clipboard && cevt.selection != w.atoms.primary) || cevt.property == C.None {
@@ -691,7 +743,7 @@ func (h *x11EventHandler) handleEvents() bool {
 			cevt := (*C.XClientMessageEvent)(unsafe.Pointer(xev))
 			switch *(*C.long)(unsafe.Pointer(&cevt.data)) {
 			case C.long(w.atoms.evDelWindow):
-				w.dead = true
+				w.shutdown(nil)
 				return false
 			}
 		}
@@ -773,8 +825,10 @@ func newX11Window(gioWin *callbacks, options []Option) error {
 		wakeups:      make(chan struct{}, 1),
 		config:       Config{Size: cnf.Size},
 	}
+	w.handler = x11EventHandler{w: w, xev: new(C.XEvent), text: make([]byte, 4)}
 	w.notify.read = pipe[0]
 	w.notify.write = pipe[1]
+	w.w.SetDriver(w)
 
 	if err := w.updateXkbKeymap(); err != nil {
 		w.destroy()
@@ -786,7 +840,7 @@ func newX11Window(gioWin *callbacks, options []Option) error {
 	hints.flags = C.InputHint
 	C.XSetWMHints(dpy, win, &hints)
 
-	name := C.CString(filepath.Base(os.Args[0]))
+	name := C.CString(ID)
 	defer C.free(unsafe.Pointer(name))
 	wmhints := C.XClassHint{name, name}
 	C.XSetClassHint(dpy, win, &wmhints)
@@ -810,18 +864,10 @@ func newX11Window(gioWin *callbacks, options []Option) error {
 	// extensions
 	C.XSetWMProtocols(dpy, win, &w.atoms.evDelWindow, 1)
 
-	go func() {
-		w.w.SetDriver(w)
-
-		// make the window visible on the screen
-		C.XMapWindow(dpy, win)
-		w.Configure(options)
-		w.w.Event(X11ViewEvent{Display: unsafe.Pointer(dpy), Window: uintptr(win)})
-		w.setStage(system.StageRunning)
-		w.loop()
-		w.w.Event(X11ViewEvent{})
-		w.destroy()
-	}()
+	// make the window visible on the screen
+	C.XMapWindow(dpy, win)
+	w.Configure(options)
+	w.ProcessEvent(X11ViewEvent{Display: unsafe.Pointer(dpy), Window: uintptr(win)})
 	return nil
 }
 

app/permission/bluetooth/main.go

@@ -4,15 +4,15 @@
 Package bluetooth implements permissions to access Bluetooth and Bluetooth
 Low Energy hardware, including the ability to discover and pair devices.
 
-Android
+# Android
 
 The following entries will be added to AndroidManifest.xml:
 
-    <uses-permission android:name="android.permission.BLUETOOTH"/>
-    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
-    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
-    <uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
-    <uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/>
+	<uses-permission android:name="android.permission.BLUETOOTH"/>
+	<uses-permission android:name="android.permission.BLUETOOTH_ADMIN"/>
+	<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
+	<uses-feature android:name="android.hardware.bluetooth" android:required="false"/>
+	<uses-feature android:name="android.hardware.bluetooth_le" android:required="false"/>
 
 Note that ACCESS_FINE_LOCATION is required on Android before the Bluetooth
 device may be used.

app/permission/camera/main.go

@@ -3,12 +3,12 @@
 /*
 Package camera implements permissions to access camera hardware.
 
-Android
+# Android
 
 The following entries will be added to AndroidManifest.xml:
 
-    <uses-permission android:name="android.permission.CAMERA"/>
-    <uses-feature android:name="android.hardware.camera" android:required="false"/>
+	<uses-permission android:name="android.permission.CAMERA"/>
+	<uses-feature android:name="android.hardware.camera" android:required="false"/>
 
 CAMERA is a "dangerous" permission. See documentation for package
 gioui.org/app/permission for more information.

app/permission/doc.go

@@ -34,7 +34,7 @@ program's source code:
 		_ "net"
 	)
 
-Android -- Dangerous Permissions
+# Android -- Dangerous Permissions
 
 Certain permissions on Android are marked with a protection level of
 "dangerous". This means that, in addition to including the relevant

app/permission/networkstate/main.go

@@ -3,11 +3,10 @@
 /*
 Package networkstate implements permissions to access network connectivity information.
 
-Android
+# Android
 
 The following entries will be added to AndroidManifest.xml:
 
-    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
-
+	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
 */
 package networkstate

app/permission/storage/main.go

@@ -4,12 +4,12 @@
 Package storage implements read and write storage permissions
 on mobile devices.
 
-Android
+# Android
 
 The following entries will be added to AndroidManifest.xml:
 
-    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
-    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
+	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
+	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
 
 READ_EXTERNAL_STORAGE and WRITE_EXTERNAL_STORAGE are "dangerous" permissions.
 See documentation for package gioui.org/app/permission for more information.

app/permission/wakelock/wakelock.go

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+/*
+Package wakelock implements permission to acquire locks that keep the system
+from suspending.
+
+# Android
+
+The following entries will be added to AndroidManifest.xml:
+
+	<uses-permission android:name="android.permission.WAKE_LOCK"/>
+*/
+package wakelock

app/system.go

@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package app
+
+// DestroyEvent is the last event sent through
+// a window event channel.
+type DestroyEvent struct {
+	// Err is nil for normal window closures. If a
+	// window is prematurely closed, Err is the cause.
+	Err error
+}
+
+func (DestroyEvent) ImplementsEvent() {}

cmd/go.mod

@@ -1,14 +0,0 @@
-module gioui.org/cmd
-
-go 1.13
-
-require (
-	gioui.org v0.0.0-20220328154813-a3f147541fd0
-	github.com/akavel/rsrc v0.10.1
-	github.com/chromedp/cdproto v0.0.0-20191114225735-6626966fbae4
-	github.com/chromedp/chromedp v0.5.2
-	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
-	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9
-	golang.org/x/text v0.3.6
-	golang.org/x/tools v0.1.0
-)

cmd/go.sum

@@ -1,475 +0,0 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3/go.mod h1:OYVuxibdk9OSLX8vAqydtRPP87PyTFcT9uH3MlEGBQA=
-gioui.org v0.0.0-20220328154813-a3f147541fd0 h1:n4FUiCT6P4a2wF6hwX4a5R8TpjAhu/d+3nhwZW16MAI=
-gioui.org v0.0.0-20220328154813-a3f147541fd0/go.mod h1:b8vBukexG6eYuXZa14asjLAWJ+JjbZ/ophEnS2FjYUg=
-gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
-gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJGFDjINIPi1jtO6pc=
-gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
-gioui.org/shader v1.0.6 h1:cvZmU+eODFR2545X+/8XucgZdTtEjR3QWW6W65b0q5Y=
-gioui.org/shader v1.0.6/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
-github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
-github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
-github.com/VividCortex/gohistogram v1.0.0/go.mod h1:Pf5mBqqDxYaXu3hDrrU+w6nw50o/4+TcAqDqk/vUH7g=
-github.com/afex/hystrix-go v0.0.0-20180502004556-fa1af6a1f4f5/go.mod h1:SkGFH1ia65gfNATL8TAiHDNxPzPdmEL5uirI2Uyuz6c=
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-github.com/akavel/rsrc v0.10.1/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
-github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
-github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/apache/thrift v0.12.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
-github.com/apache/thrift v0.13.0/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
-github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
-github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
-github.com/aryann/difflib v0.0.0-20170710044230-e206f873d14a/go.mod h1:DAHtR1m6lCRdSC2Tm3DSWRPvIPr6xNKyeHdqDQSQT+A=
-github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
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-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
-github.com/casbin/casbin/v2 v2.1.2/go.mod h1:YcPU1XXisHhLzuxH9coDNf2FbKpjGlbCg3n9yuLkIJQ=
-github.com/cenkalti/backoff v2.2.1+incompatible/go.mod h1:90ReRw6GdpyfrHakVjL/QHaoyV4aDUVVkXQJJJ3NXXM=
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-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd v0.0.0-20180511133405-39ca1b05acc7/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/pkg v0.0.0-20160727233714-3ac0863d7acf/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
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-google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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-google.golang.org/genproto v0.0.0-20190530194941-fb225487d101/go.mod h1:z3L6/3dTEVtUr6QSP8miRzeRqwQOioJ9I66odjN4I7s=
-google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
-google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
-google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.20.0/go.mod h1:chYK+tFQF0nDUGJgXMSgLCQk3phJEuONr2DCgLDdAQM=
-google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
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-google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
-google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
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-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
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-gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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-gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
-gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
-gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
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-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
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-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
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cmd/gogio/android_test.go

@@ -1,143 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"image"
-	"image/png"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-)
-
-type AndroidTestDriver struct {
-	driverBase
-
-	sdkDir  string
-	adbPath string
-}
-
-var rxAdbDevice = regexp.MustCompile(`(.*)\s+device$`)
-
-func (d *AndroidTestDriver) Start(path string) {
-	d.sdkDir = os.Getenv("ANDROID_SDK_ROOT")
-	if d.sdkDir == "" {
-		d.Skipf("Android SDK is required; set $ANDROID_SDK_ROOT")
-	}
-	d.adbPath = filepath.Join(d.sdkDir, "platform-tools", "adb")
-	if _, err := os.Stat(d.adbPath); os.IsNotExist(err) {
-		d.Skipf("adb not found")
-	}
-
-	devOut := bytes.TrimSpace(d.adb("devices"))
-	devices := rxAdbDevice.FindAllSubmatch(devOut, -1)
-	switch len(devices) {
-	case 0:
-		d.Skipf("no Android devices attached via adb; skipping")
-	case 1:
-	default:
-		d.Skipf("multiple Android devices attached via adb; skipping")
-	}
-
-	// If the device is attached but asleep, it's probably just charging.
-	// Don't use it; the screen needs to be on and unlocked for the test to
-	// work.
-	if !bytes.Contains(
-		d.adb("shell", "dumpsys", "power"),
-		[]byte(" mWakefulness=Awake"),
-	) {
-		d.Skipf("Android device isn't awake; skipping")
-	}
-
-	// First, build the app.
-	apk := filepath.Join(d.tempDir("gio-endtoend-android"), "e2e.apk")
-	d.gogio("-target=android", "-appid="+appid, "-o="+apk, path)
-
-	// Make sure the app isn't installed already, and try to uninstall it
-	// when we finish. Previous failed test runs might have left the app.
-	d.tryUninstall()
-	d.adb("install", apk)
-	d.Cleanup(d.tryUninstall)
-
-	// Force our e2e app to be fullscreen, so that the android system bar at
-	// the top doesn't mess with our screenshots.
-	// TODO(mvdan): is there a way to do this via gio, so that we don't need
-	// to set up a global Android setting via the shell?
-	d.adb("shell", "settings", "put", "global", "policy_control", "immersive.full="+appid)
-
-	// Make sure the app isn't already running.
-	d.adb("shell", "pm", "clear", appid)
-
-	// Start listening for log messages.
-	{
-		ctx, cancel := context.WithCancel(context.Background())
-		cmd := exec.CommandContext(ctx, d.adbPath,
-			"logcat",
-			"-s",       // suppress other logs
-			"-T1",      // don't show previous log messages
-			appid+":*", // show all logs from our gio app ID
-		)
-		output, err := cmd.StdoutPipe()
-		if err != nil {
-			d.Fatal(err)
-		}
-		cmd.Stderr = cmd.Stdout
-		d.output = output
-		if err := cmd.Start(); err != nil {
-			d.Fatal(err)
-		}
-		d.Cleanup(cancel)
-	}
-
-	// Start the app.
-	d.adb("shell", "monkey", "-p", appid, "1")
-
-	// Wait for the gio app to render.
-	d.waitForFrame()
-}
-
-func (d *AndroidTestDriver) Screenshot() image.Image {
-	out := d.adb("shell", "screencap", "-p")
-	img, err := png.Decode(bytes.NewReader(out))
-	if err != nil {
-		d.Fatal(err)
-	}
-	return img
-}
-
-func (d *AndroidTestDriver) tryUninstall() {
-	cmd := exec.Command(d.adbPath, "shell", "pm", "uninstall", appid)
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		if bytes.Contains(out, []byte("Unknown package")) {
-			// The package is not installed. Don't log anything.
-			return
-		}
-		d.Logf("could not uninstall: %v\n%s", err, out)
-	}
-}
-
-func (d *AndroidTestDriver) adb(args ...interface{}) []byte {
-	strs := []string{}
-	for _, arg := range args {
-		strs = append(strs, fmt.Sprint(arg))
-	}
-	cmd := exec.Command(d.adbPath, strs...)
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		d.Errorf("%s", out)
-		d.Fatal(err)
-	}
-	return out
-}
-
-func (d *AndroidTestDriver) Click(x, y int) {
-	d.adb("shell", "input", "tap", x, y)
-
-	// Wait for the gio app to render after this click.
-	d.waitForFrame()
-}

cmd/gogio/build_info.go

@@ -1,156 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-	"os"
-	"os/exec"
-	"path"
-	"path/filepath"
-	"runtime"
-	"strings"
-)
-
-type buildInfo struct {
-	appID    string
-	archs    []string
-	ldflags  string
-	minsdk   int
-	name     string
-	pkgDir   string
-	pkgPath  string
-	iconPath string
-	tags     string
-	target   string
-	version  int
-	key      string
-	password string
-}
-
-func newBuildInfo(pkgPath string) (*buildInfo, error) {
-	pkgMetadata, err := getPkgMetadata(pkgPath)
-	if err != nil {
-		return nil, err
-	}
-	appID := getAppID(pkgMetadata)
-	appIcon := filepath.Join(pkgMetadata.Dir, "appicon.png")
-	if *iconPath != "" {
-		appIcon = *iconPath
-	}
-	bi := &buildInfo{
-		appID:    appID,
-		archs:    getArchs(),
-		ldflags:  getLdFlags(appID),
-		minsdk:   *minsdk,
-		name:     getPkgName(pkgMetadata),
-		pkgDir:   pkgMetadata.Dir,
-		pkgPath:  pkgPath,
-		iconPath: appIcon,
-		tags:     *extraTags,
-		target:   *target,
-		version:  *version,
-		key:      *signKey,
-		password: *signPass,
-	}
-	return bi, nil
-}
-
-func getArchs() []string {
-	if *archNames != "" {
-		return strings.Split(*archNames, ",")
-	}
-	switch *target {
-	case "js":
-		return []string{"wasm"}
-	case "ios", "tvos":
-		// Only 64-bit support.
-		return []string{"arm64", "amd64"}
-	case "android":
-		return []string{"arm", "arm64", "386", "amd64"}
-	case "windows":
-		goarch := os.Getenv("GOARCH")
-		if goarch == "" {
-			goarch = runtime.GOARCH
-		}
-		return []string{goarch}
-	default:
-		// TODO: Add flag tests.
-		panic("The target value has already been validated, this will never execute.")
-	}
-}
-
-func getLdFlags(appID string) string {
-	var ldflags []string
-	if extra := *extraLdflags; extra != "" {
-		ldflags = append(ldflags, strings.Split(extra, " ")...)
-	}
-	// Pass appID along, to be used for logging on platforms like Android.
-	ldflags = append(ldflags, fmt.Sprintf("-X gioui.org/app/internal/log.appID=%s", appID))
-	// Pass along all remaining arguments to the app.
-	if appArgs := flag.Args()[1:]; len(appArgs) > 0 {
-		ldflags = append(ldflags, fmt.Sprintf("-X gioui.org/app.extraArgs=%s", strings.Join(appArgs, "|")))
-	}
-	if m := *linkMode; m != "" {
-		ldflags = append(ldflags, "-linkmode="+m)
-	}
-	return strings.Join(ldflags, " ")
-}
-
-type packageMetadata struct {
-	PkgPath string
-	Dir     string
-}
-
-func getPkgMetadata(pkgPath string) (*packageMetadata, error) {
-	pkgImportPath, err := runCmd(exec.Command("go", "list", "-f", "{{.ImportPath}}", pkgPath))
-	if err != nil {
-		return nil, err
-	}
-	pkgDir, err := runCmd(exec.Command("go", "list", "-f", "{{.Dir}}", pkgPath))
-	if err != nil {
-		return nil, err
-	}
-	return &packageMetadata{
-		PkgPath: pkgImportPath,
-		Dir:     pkgDir,
-	}, nil
-}
-
-func getAppID(pkgMetadata *packageMetadata) string {
-	if *appID != "" {
-		return *appID
-	}
-	elems := strings.Split(pkgMetadata.PkgPath, "/")
-	domain := strings.Split(elems[0], ".")
-	name := ""
-	if len(elems) > 1 {
-		name = "." + elems[len(elems)-1]
-	}
-	if len(elems) < 2 && len(domain) < 2 {
-		name = "." + domain[0]
-		domain[0] = "localhost"
-	} else {
-		for i := 0; i < len(domain)/2; i++ {
-			opp := len(domain) - 1 - i
-			domain[i], domain[opp] = domain[opp], domain[i]
-		}
-	}
-
-	pkgDomain := strings.Join(domain, ".")
-	appid := []rune(pkgDomain + name)
-
-	// a Java-language-style package name may contain upper- and lower-case
-	// letters and underscores with individual parts separated by '.'.
-	// https://developer.android.com/guide/topics/manifest/manifest-element
-	for i, c := range appid {
-		if !('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' ||
-			c == '_' || c == '.') {
-			appid[i] = '_'
-		}
-	}
-	return string(appid)
-}
-
-func getPkgName(pkgMetadata *packageMetadata) string {
-	return path.Base(pkgMetadata.PkgPath)
-}

cmd/gogio/build_info_test.go

@@ -1,32 +0,0 @@
-package main
-
-import "testing"
-
-type expval struct {
-	in, out string
-}
-
-func TestAppID(t *testing.T) {
-	t.Parallel()
-
-	tests := []expval{
-		{"example", "localhost.example"},
-		{"example.com", "com.example"},
-		{"www.example.com", "com.example.www"},
-		{"examplecom/app", "examplecom.app"},
-		{"example.com/app", "com.example.app"},
-		{"www.example.com/app", "com.example.www.app"},
-		{"www.en.example.com/app", "com.example.en.www.app"},
-		{"example.com/dir/app", "com.example.app"},
-		{"example.com/dir.ext/app", "com.example.app"},
-		{"example.com/dir/app.ext", "com.example.app.ext"},
-		{"example-com.net/dir/app", "net.example_com.app"},
-	}
-
-	for i, test := range tests {
-		got := getAppID(&packageMetadata{PkgPath: test.in})
-		if exp := test.out; got != exp {
-			t.Errorf("(%d): expected '%s', got '%s'", i, exp, got)
-		}
-	}
-}

cmd/gogio/doc.go

@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-/*
-The gogio tool builds and packages Gio programs for Android, iOS/tvOS
-and WebAssembly.
-
-Run gogio with no arguments for instructions, or see the examples at
-https://gioui.org.
-*/
-package main

cmd/gogio/e2e_test.go

@@ -1,331 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"bufio"
-	"errors"
-	"flag"
-	"fmt"
-	"image"
-	"image/color"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"strings"
-	"testing"
-	"time"
-)
-
-var raceEnabled = false
-
-var headless = flag.Bool("headless", true, "run end-to-end tests in headless mode")
-
-const appid = "localhost.gogio.endtoend"
-
-// TestDriver is implemented by each of the platforms we can run end-to-end
-// tests on. None of its methods return any errors, as the errors are directly
-// reported to testing.T via methods like Fatal.
-type TestDriver interface {
-	initBase(t *testing.T, width, height int)
-
-	// Start opens the Gio app found at path. The driver should attempt to
-	// run the app with the base driver's width and height, and the
-	// platform's background should be white.
-	//
-	// When the function returns, the gio app must be ready to use on the
-	// platform, with its initial frame fully drawn.
-	Start(path string)
-
-	// Screenshot takes a screenshot of the Gio app on the platform.
-	Screenshot() image.Image
-
-	// Click performs a pointer click at the specified coordinates,
-	// including both press and release. It returns when the next frame is
-	// fully drawn.
-	Click(x, y int)
-}
-
-type driverBase struct {
-	*testing.T
-
-	width, height int
-
-	output      io.Reader
-	frameNotifs chan bool
-}
-
-func (d *driverBase) initBase(t *testing.T, width, height int) {
-	d.T = t
-	d.width, d.height = width, height
-}
-
-func TestEndToEnd(t *testing.T) {
-	if testing.Short() {
-		t.Skipf("end-to-end tests tend to be slow")
-	}
-
-	t.Parallel()
-
-	const (
-		testdataWithGoImportPkgPath = "gioui.org/cmd/gogio/testdata"
-		testdataWithRelativePkgPath = "testdata/testdata.go"
-	)
-	// Keep this list local, to not reuse TestDriver objects.
-	subtests := []struct {
-		name    string
-		driver  TestDriver
-		pkgPath string
-	}{
-		{"X11 using go import path", &X11TestDriver{}, testdataWithGoImportPkgPath},
-		{"X11", &X11TestDriver{}, testdataWithRelativePkgPath},
-		// Doesn't work on the builders.
-		//{"Wayland", &WaylandTestDriver{}, testdataWithRelativePkgPath},
-		{"JS", &JSTestDriver{}, testdataWithRelativePkgPath},
-		{"Android", &AndroidTestDriver{}, testdataWithRelativePkgPath},
-		{"Windows", &WineTestDriver{}, testdataWithRelativePkgPath},
-	}
-
-	for _, subtest := range subtests {
-		t.Run(subtest.name, func(t *testing.T) {
-			subtest := subtest // copy the changing loop variable
-			t.Parallel()
-			runEndToEndTest(t, subtest.driver, subtest.pkgPath)
-		})
-	}
-}
-
-func runEndToEndTest(t *testing.T, driver TestDriver, pkgPath string) {
-	size := image.Point{X: 800, Y: 600}
-	driver.initBase(t, size.X, size.Y)
-
-	t.Log("starting driver and gio app")
-	driver.Start(pkgPath)
-
-	beef := color.NRGBA{R: 0xde, G: 0xad, B: 0xbe, A: 0xff}
-	white := color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
-	black := color.NRGBA{R: 0x00, G: 0x00, B: 0x00, A: 0xff}
-	gray := color.NRGBA{R: 0xbb, G: 0xbb, B: 0xbb, A: 0xff}
-	red := color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}
-
-	// These are the four colors at the beginning.
-	t.Log("taking initial screenshot")
-	withRetries(t, 4*time.Second, func() error {
-		img := driver.Screenshot()
-		size = img.Bounds().Size() // override the default size
-		return checkImageCorners(img, beef, white, black, gray)
-	})
-
-	// TODO(mvdan): implement this properly in the Wayland driver; swaymsg
-	// almost works to automate clicks, but the button presses end up in the
-	// wrong coordinates.
-	if _, ok := driver.(*WaylandTestDriver); ok {
-		return
-	}
-
-	// Click the first and last sections to turn them red.
-	t.Log("clicking twice and taking another screenshot")
-	driver.Click(1*(size.X/4), 1*(size.Y/4))
-	driver.Click(3*(size.X/4), 3*(size.Y/4))
-	withRetries(t, 4*time.Second, func() error {
-		img := driver.Screenshot()
-		return checkImageCorners(img, red, white, black, red)
-	})
-}
-
-// withRetries keeps retrying fn until it succeeds, or until the timeout is hit.
-// It uses a rudimentary kind of backoff, which starts with 100ms delays. As
-// such, timeout should generally be in the order of seconds.
-func withRetries(t *testing.T, timeout time.Duration, fn func() error) {
-	t.Helper()
-
-	timeoutTimer := time.NewTimer(timeout)
-	defer timeoutTimer.Stop()
-	backoff := 100 * time.Millisecond
-
-	tries := 0
-	var lastErr error
-	for {
-		if lastErr = fn(); lastErr == nil {
-			return
-		}
-		tries++
-		t.Logf("retrying after %s", backoff)
-
-		// Use a timer instead of a sleep, so that the timeout can stop
-		// the backoff early. Don't reuse this timer, since we're not in
-		// a hot loop, and we don't want tricky code.
-		backoffTimer := time.NewTimer(backoff)
-		defer backoffTimer.Stop()
-
-		select {
-		case <-timeoutTimer.C:
-			t.Errorf("last error: %v", lastErr)
-			t.Fatalf("hit timeout of %s after %d tries", timeout, tries)
-		case <-backoffTimer.C:
-		}
-
-		// Keep doubling it until a maximum. With the start at 100ms,
-		// we'll do: 100ms, 200ms, 400ms, 800ms, 1.6s, and 2s forever.
-		backoff *= 2
-		if max := 2 * time.Second; backoff > max {
-			backoff = max
-		}
-	}
-}
-
-type colorMismatch struct {
-	x, y            int
-	wantRGB, gotRGB [3]uint32
-}
-
-func (m colorMismatch) String() string {
-	return fmt.Sprintf("%3d,%-3d got 0x%04x%04x%04x, want 0x%04x%04x%04x",
-		m.x, m.y,
-		m.gotRGB[0], m.gotRGB[1], m.gotRGB[2],
-		m.wantRGB[0], m.wantRGB[1], m.wantRGB[2],
-	)
-}
-
-func checkImageCorners(img image.Image, topLeft, topRight, botLeft, botRight color.Color) error {
-	// The colors are split in four rectangular sections. Check the corners
-	// of each of the sections. We check the corners left to right, top to
-	// bottom, like when reading left-to-right text.
-
-	size := img.Bounds().Size()
-	var mismatches []colorMismatch
-
-	checkColor := func(x, y int, want color.Color) {
-		r, g, b, _ := want.RGBA()
-		got := img.At(x, y)
-		r_, g_, b_, _ := got.RGBA()
-		if r_ != r || g_ != g || b_ != b {
-			mismatches = append(mismatches, colorMismatch{
-				x:       x,
-				y:       y,
-				wantRGB: [3]uint32{r, g, b},
-				gotRGB:  [3]uint32{r_, g_, b_},
-			})
-		}
-	}
-
-	{
-		minX, minY := 5, 5
-		maxX, maxY := (size.X/2)-5, (size.Y/2)-5
-		checkColor(minX, minY, topLeft)
-		checkColor(maxX, minY, topLeft)
-		checkColor(minX, maxY, topLeft)
-		checkColor(maxX, maxY, topLeft)
-	}
-	{
-		minX, minY := (size.X/2)+5, 5
-		maxX, maxY := size.X-5, (size.Y/2)-5
-		checkColor(minX, minY, topRight)
-		checkColor(maxX, minY, topRight)
-		checkColor(minX, maxY, topRight)
-		checkColor(maxX, maxY, topRight)
-	}
-	{
-		minX, minY := 5, (size.Y/2)+5
-		maxX, maxY := (size.X/2)-5, size.Y-5
-		checkColor(minX, minY, botLeft)
-		checkColor(maxX, minY, botLeft)
-		checkColor(minX, maxY, botLeft)
-		checkColor(maxX, maxY, botLeft)
-	}
-	{
-		minX, minY := (size.X/2)+5, (size.Y/2)+5
-		maxX, maxY := size.X-5, size.Y-5
-		checkColor(minX, minY, botRight)
-		checkColor(maxX, minY, botRight)
-		checkColor(minX, maxY, botRight)
-		checkColor(maxX, maxY, botRight)
-	}
-	if n := len(mismatches); n > 0 {
-		b := new(strings.Builder)
-		fmt.Fprintf(b, "encountered %d color mismatches:\n", n)
-		for _, m := range mismatches {
-			fmt.Fprintf(b, "%s\n", m)
-		}
-		return errors.New(b.String())
-	}
-	return nil
-}
-
-func (d *driverBase) waitForFrame() {
-	d.Helper()
-
-	if d.frameNotifs == nil {
-		// Start the goroutine that reads output lines and notifies of
-		// new frames via frameNotifs. The test doesn't wait for this
-		// goroutine to finish; it will naturally end when the output
-		// reader reaches an error like EOF.
-		d.frameNotifs = make(chan bool, 1)
-		if d.output == nil {
-			d.Fatal("need an output reader to be notified of frames")
-		}
-		go func() {
-			scanner := bufio.NewScanner(d.output)
-			for scanner.Scan() {
-				line := scanner.Text()
-				d.Log(line)
-				if strings.Contains(line, "gio frame ready") {
-					d.frameNotifs <- true
-				}
-			}
-			// Since we're only interested in the output while the
-			// app runs, and we don't know when it finishes here,
-			// ignore "already closed" pipe errors.
-			if err := scanner.Err(); err != nil && !errors.Is(err, os.ErrClosed) {
-				d.Errorf("reading app output: %v", err)
-			}
-		}()
-	}
-
-	// Unfortunately, there isn't a way to select on a test failing, since
-	// testing.T doesn't have anything like a context or a "done" channel.
-	//
-	// We can't let selects block forever, since the default -test.timeout
-	// is ten minutes - far too long for tests that take seconds.
-	//
-	// For now, a static short timeout is better than nothing. 5s is plenty
-	// for our simple test app to render on any device.
-	select {
-	case <-d.frameNotifs:
-	case <-time.After(5 * time.Second):
-		d.Fatalf("timed out waiting for a frame to be ready")
-	}
-}
-
-func (d *driverBase) needPrograms(names ...string) {
-	d.Helper()
-	for _, name := range names {
-		if _, err := exec.LookPath(name); err != nil {
-			d.Skipf("%s needed to run", name)
-		}
-	}
-}
-
-func (d *driverBase) tempDir(name string) string {
-	d.Helper()
-	dir, err := ioutil.TempDir("", name)
-	if err != nil {
-		d.Fatal(err)
-	}
-	d.Cleanup(func() { os.RemoveAll(dir) })
-	return dir
-}
-
-func (d *driverBase) gogio(args ...string) {
-	d.Helper()
-	prog, err := os.Executable()
-	if err != nil {
-		d.Fatal(err)
-	}
-	cmd := exec.Command(prog, args...)
-	cmd.Env = append(os.Environ(), "RUN_GOGIO=1")
-	if out, err := cmd.CombinedOutput(); err != nil {
-		d.Fatalf("gogio error: %s:\n%s", err, out)
-	}
-}

cmd/gogio/help.go

@@ -1,69 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main
-
-const mainUsage = `The gogio command builds and packages Gio (gioui.org) programs.
-
-Usage:
-
-	gogio -target <target> [flags] <package> [run arguments]
-
-The gogio tool builds and packages Gio programs for platforms where additional
-metadata or support files are required.
-
-The package argument specifies an import path or a single Go source file to
-package. Any run arguments are appended to os.Args at runtime.
-
-Compiled Java class files from jar files in the package directory are
-included in Android builds.
-
-The mandatory -target flag selects the target platform: ios or android for the
-mobile platforms, tvos for Apple's tvOS, js for WebAssembly/WebGL.
-
-The -arch flag specifies a comma separated list of GOARCHs to include. The
-default is all supported architectures.
-
-The -o flag specifies an output file or directory, depending on the target.
-
-The -buildmode flag selects the build mode. Two build modes are available, exe
-and archive. Buildmode exe outputs an .ipa file for iOS or tvOS, an .apk file
-for Android or a directory with the WebAssembly module and support files for
-a browser.
-
-The -ldflags and -tags flags pass extra linker flags and tags to the go tool.
-
-As a special case for iOS or tvOS, specifying a path that ends with ".app"
-will output an app directory suitable for a simulator.
-
-The other buildmode is archive, which will output an .aar library for Android
-or a .framework for iOS and tvOS.
-
-The -icon flag specifies a path to a PNG image to use as app icon on iOS and Android.
-If left unspecified, the appicon.png file from the main package is used
-(if it exists).
-
-The -appid flag specifies the package name for Android or the bundle id for
-iOS and tvOS. A bundle id must be provisioned through Xcode before the gogio
-tool can use it.
-
-The -version flag specifies the integer version code for Android and the last
-component of the 1.0.X version for iOS and tvOS.
-
-For Android builds the -minsdk flag specify the minimum SDK level. For example,
-use -minsdk 22 to target Android 5.1 (Lollipop) and later.
-
-For Windows builds the -minsdk flag specify the minimum OS version. For example,
-use -mindk 10 to target Windows 10 and later, -minsdk 6 for Windows Vista and later.
-
-For iOS builds the -minsdk flag specify the minimum iOS version. For example, 
-use -mindk 15 to target iOS 15.0 and later.
-
-The -work flag prints the path to the working directory and suppress
-its deletion.
-
-The -x flag will print all the external commands executed by the gogio tool.
-
-The -signkey flag specifies the path of the keystore, used for signing Android apk/aab files.
-
-The -signpass flag specifies the password of the keystore, ignored if -signkey is not provided.
-`

cmd/gogio/iosbuild.go

@@ -1,589 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main
-
-import (
-	"archive/zip"
-	"crypto/sha1"
-	"encoding/hex"
-	"errors"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"time"
-
-	"golang.org/x/sync/errgroup"
-)
-
-const (
-	minIOSVersion = 10
-	// Metal is available from iOS 8 on devices, yet from version 13 on the
-	// simulator.
-	minSimulatorVersion = 13
-)
-
-func buildIOS(tmpDir, target string, bi *buildInfo) error {
-	appName := bi.name
-	switch *buildMode {
-	case "archive":
-		framework := *destPath
-		if framework == "" {
-			framework = fmt.Sprintf("%s.framework", strings.Title(appName))
-		}
-		return archiveIOS(tmpDir, target, framework, bi)
-	case "exe":
-		out := *destPath
-		if out == "" {
-			out = appName + ".ipa"
-		}
-		forDevice := strings.HasSuffix(out, ".ipa")
-		// Filter out unsupported architectures.
-		for i := len(bi.archs) - 1; i >= 0; i-- {
-			switch bi.archs[i] {
-			case "arm", "arm64":
-				if forDevice {
-					continue
-				}
-			case "386", "amd64":
-				if !forDevice {
-					continue
-				}
-			}
-
-			bi.archs = append(bi.archs[:i], bi.archs[i+1:]...)
-		}
-		tmpFramework := filepath.Join(tmpDir, "Gio.framework")
-		if err := archiveIOS(tmpDir, target, tmpFramework, bi); err != nil {
-			return err
-		}
-		if !forDevice && !strings.HasSuffix(out, ".app") {
-			return fmt.Errorf("the specified output directory %q does not end in .app or .ipa", out)
-		}
-		if !forDevice {
-			return exeIOS(tmpDir, target, out, bi)
-		}
-		payload := filepath.Join(tmpDir, "Payload")
-		appDir := filepath.Join(payload, appName+".app")
-		if err := os.MkdirAll(appDir, 0755); err != nil {
-			return err
-		}
-		if err := exeIOS(tmpDir, target, appDir, bi); err != nil {
-			return err
-		}
-		if err := signIOS(bi, tmpDir, appDir); err != nil {
-			return err
-		}
-		return zipDir(out, tmpDir, "Payload")
-	default:
-		panic("unreachable")
-	}
-}
-
-func signIOS(bi *buildInfo, tmpDir, app string) error {
-	home, err := os.UserHomeDir()
-	if err != nil {
-		return err
-	}
-	provPattern := filepath.Join(home, "Library", "MobileDevice", "Provisioning Profiles", "*.mobileprovision")
-	provisions, err := filepath.Glob(provPattern)
-	if err != nil {
-		return err
-	}
-	provInfo := filepath.Join(tmpDir, "provision.plist")
-	var avail []string
-	for _, prov := range provisions {
-		// Decode the provision file to a plist.
-		_, err := runCmd(exec.Command("security", "cms", "-D", "-i", prov, "-o", provInfo))
-		if err != nil {
-			return err
-		}
-		expUnix, err := runCmd(exec.Command("/usr/libexec/PlistBuddy", "-c", "Print:ExpirationDate", provInfo))
-		if err != nil {
-			return err
-		}
-		exp, err := time.Parse(time.UnixDate, expUnix)
-		if err != nil {
-			return fmt.Errorf("sign: failed to parse expiration date from %q: %v", prov, err)
-		}
-		if exp.Before(time.Now()) {
-			continue
-		}
-		appIDPrefix, err := runCmd(exec.Command("/usr/libexec/PlistBuddy", "-c", "Print:ApplicationIdentifierPrefix:0", provInfo))
-		if err != nil {
-			return err
-		}
-		provAppID, err := runCmd(exec.Command("/usr/libexec/PlistBuddy", "-c", "Print:Entitlements:application-identifier", provInfo))
-		if err != nil {
-			return err
-		}
-		expAppID := fmt.Sprintf("%s.%s", appIDPrefix, bi.appID)
-		avail = append(avail, provAppID)
-		if expAppID != provAppID {
-			continue
-		}
-		// Copy provisioning file.
-		embedded := filepath.Join(app, "embedded.mobileprovision")
-		if err := copyFile(embedded, prov); err != nil {
-			return err
-		}
-		certDER, err := runCmdRaw(exec.Command("/usr/libexec/PlistBuddy", "-c", "Print:DeveloperCertificates:0", provInfo))
-		if err != nil {
-			return err
-		}
-		// Omit trailing newline.
-		certDER = certDER[:len(certDER)-1]
-		entitlements, err := runCmd(exec.Command("/usr/libexec/PlistBuddy", "-x", "-c", "Print:Entitlements", provInfo))
-		if err != nil {
-			return err
-		}
-		entFile := filepath.Join(tmpDir, "entitlements.plist")
-		if err := ioutil.WriteFile(entFile, []byte(entitlements), 0660); err != nil {
-			return err
-		}
-		identity := sha1.Sum(certDER)
-		idHex := hex.EncodeToString(identity[:])
-		_, err = runCmd(exec.Command("codesign", "-s", idHex, "-v", "--entitlements", entFile, app))
-		return err
-	}
-	return fmt.Errorf("sign: no valid provisioning profile found for bundle id %q among %v", bi.appID, avail)
-}
-
-func exeIOS(tmpDir, target, app string, bi *buildInfo) error {
-	if bi.appID == "" {
-		return errors.New("app id is empty; use -appid to set it")
-	}
-	if err := os.RemoveAll(app); err != nil {
-		return err
-	}
-	if err := os.Mkdir(app, 0755); err != nil {
-		return err
-	}
-	mainm := filepath.Join(tmpDir, "main.m")
-	const mainmSrc = `@import UIKit;
-@import Gio;
-
-@interface GioAppDelegate : UIResponder <UIApplicationDelegate>
-@property (strong, nonatomic) UIWindow *window;
-@end
-
-@implementation GioAppDelegate
-- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
-	self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
-	GioViewController *controller = [[GioViewController alloc] initWithNibName:nil bundle:nil];
-	self.window.rootViewController = controller;
-	[self.window makeKeyAndVisible];
-	return YES;
-}
-@end
-
-int main(int argc, char * argv[]) {
-	@autoreleasepool {
-		return UIApplicationMain(argc, argv, nil, NSStringFromClass([GioAppDelegate class]));
-	}
-}`
-	if err := ioutil.WriteFile(mainm, []byte(mainmSrc), 0660); err != nil {
-		return err
-	}
-	appName := strings.Title(bi.name)
-	exe := filepath.Join(app, appName)
-	lipo := exec.Command("xcrun", "lipo", "-o", exe, "-create")
-	var builds errgroup.Group
-	for _, a := range bi.archs {
-		clang, cflags, err := iosCompilerFor(target, a, bi.minsdk)
-		if err != nil {
-			return err
-		}
-		exeSlice := filepath.Join(tmpDir, "app-"+a)
-		lipo.Args = append(lipo.Args, exeSlice)
-		compile := exec.Command(clang, cflags...)
-		compile.Args = append(compile.Args,
-			"-Werror",
-			"-fmodules",
-			"-fobjc-arc",
-			"-x", "objective-c",
-			"-F", tmpDir,
-			"-o", exeSlice,
-			mainm,
-		)
-		builds.Go(func() error {
-			_, err := runCmd(compile)
-			return err
-		})
-	}
-	if err := builds.Wait(); err != nil {
-		return err
-	}
-	if _, err := runCmd(lipo); err != nil {
-		return err
-	}
-	infoPlist := buildInfoPlist(bi)
-	plistFile := filepath.Join(app, "Info.plist")
-	if err := ioutil.WriteFile(plistFile, []byte(infoPlist), 0660); err != nil {
-		return err
-	}
-	if _, err := os.Stat(bi.iconPath); err == nil {
-		assetPlist, err := iosIcons(bi, tmpDir, app, bi.iconPath)
-		if err != nil {
-			return err
-		}
-		// Merge assets plist with Info.plist
-		cmd := exec.Command(
-			"/usr/libexec/PlistBuddy",
-			"-c", "Merge "+assetPlist,
-			plistFile,
-		)
-		if _, err := runCmd(cmd); err != nil {
-			return err
-		}
-	}
-	if _, err := runCmd(exec.Command("plutil", "-convert", "binary1", plistFile)); err != nil {
-		return err
-	}
-	return nil
-}
-
-// iosIcons builds an asset catalog and compile it with the Xcode command actool.
-// iosIcons returns the asset plist file to be merged into Info.plist.
-func iosIcons(bi *buildInfo, tmpDir, appDir, icon string) (string, error) {
-	assets := filepath.Join(tmpDir, "Assets.xcassets")
-	if err := os.Mkdir(assets, 0700); err != nil {
-		return "", err
-	}
-	appIcon := filepath.Join(assets, "AppIcon.appiconset")
-	err := buildIcons(appIcon, icon, []iconVariant{
-		{path: "ios_2x.png", size: 120},
-		{path: "ios_3x.png", size: 180},
-		// The App Store icon is not allowed to contain
-		// transparent pixels.
-		{path: "ios_store.png", size: 1024, fill: true},
-	})
-	if err != nil {
-		return "", err
-	}
-	contentJson := `{
-	"images" : [
-		{
-			"size" : "60x60",
-			"idiom" : "iphone",
-			"filename" : "ios_2x.png",
-			"scale" : "2x"
-		},
-		{
-			"size" : "60x60",
-			"idiom" : "iphone",
-			"filename" : "ios_3x.png",
-			"scale" : "3x"
-		},
-		{
-			"size" : "1024x1024",
-			"idiom" : "ios-marketing",
-			"filename" : "ios_store.png",
-			"scale" : "1x"
-		}
-	]
-}`
-	contentFile := filepath.Join(appIcon, "Contents.json")
-	if err := ioutil.WriteFile(contentFile, []byte(contentJson), 0600); err != nil {
-		return "", err
-	}
-	assetPlist := filepath.Join(tmpDir, "assets.plist")
-
-	minsdk := bi.minsdk
-	if minsdk == 0 {
-		minsdk = minIOSVersion
-	}
-	compile := exec.Command(
-		"actool",
-		"--compile", appDir,
-		"--platform", iosPlatformFor(bi.target),
-		"--minimum-deployment-target", strconv.Itoa(minsdk),
-		"--app-icon", "AppIcon",
-		"--output-partial-info-plist", assetPlist,
-		assets)
-	_, err = runCmd(compile)
-	return assetPlist, err
-}
-
-func buildInfoPlist(bi *buildInfo) string {
-	appName := strings.Title(bi.name)
-	platform := iosPlatformFor(bi.target)
-	var supportPlatform string
-	switch bi.target {
-	case "ios":
-		supportPlatform = "iPhoneOS"
-	case "tvos":
-		supportPlatform = "AppleTVOS"
-	}
-	return fmt.Sprintf(`<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>en</string>
-	<key>CFBundleExecutable</key>
-	<string>%s</string>
-	<key>CFBundleIdentifier</key>
-	<string>%s</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>%s</string>
-	<key>CFBundlePackageType</key>
-	<string>APPL</string>
-	<key>CFBundleShortVersionString</key>
-	<string>1.0.%d</string>
-	<key>CFBundleVersion</key>
-	<string>%d</string>
-	<key>UILaunchStoryboardName</key>
-	<string>LaunchScreen</string>
-	<key>UIRequiredDeviceCapabilities</key>
-	<array><string>arm64</string></array>
-	<key>DTPlatformName</key>
-	<string>%s</string>
-	<key>DTPlatformVersion</key>
-	<string>12.4</string>
-	<key>MinimumOSVersion</key>
-	<string>%d</string>
-	<key>UIDeviceFamily</key>
-	<array>
-		<integer>1</integer>
-		<integer>2</integer>
-	</array>
-	<key>CFBundleSupportedPlatforms</key>
-	<array>
-		<string>%s</string>
-	</array>
-	<key>UISupportedInterfaceOrientations</key>
-	<array>
-		<string>UIInterfaceOrientationPortrait</string>
-		<string>UIInterfaceOrientationLandscapeLeft</string>
-		<string>UIInterfaceOrientationLandscapeRight</string>
-	</array>
-	<key>DTCompiler</key>
-	<string>com.apple.compilers.llvm.clang.1_0</string>
-	<key>DTPlatformBuild</key>
-	<string>16G73</string>
-	<key>DTSDKBuild</key>
-	<string>16G73</string>
-	<key>DTSDKName</key>
-	<string>%s12.4</string>
-	<key>DTXcode</key>
-	<string>1030</string>
-	<key>DTXcodeBuild</key>
-	<string>10G8</string>
-</dict>
-</plist>`, appName, bi.appID, appName, bi.version, bi.version, platform, minIOSVersion, supportPlatform, platform)
-}
-
-func iosPlatformFor(target string) string {
-	switch target {
-	case "ios":
-		return "iphoneos"
-	case "tvos":
-		return "appletvos"
-	default:
-		panic("invalid platform " + target)
-	}
-}
-
-func archiveIOS(tmpDir, target, frameworkRoot string, bi *buildInfo) error {
-	framework := filepath.Base(frameworkRoot)
-	const suf = ".framework"
-	if !strings.HasSuffix(framework, suf) {
-		return fmt.Errorf("the specified output %q does not end in '.framework'", frameworkRoot)
-	}
-	framework = framework[:len(framework)-len(suf)]
-	if err := os.RemoveAll(frameworkRoot); err != nil {
-		return err
-	}
-	frameworkDir := filepath.Join(frameworkRoot, "Versions", "A")
-	for _, dir := range []string{"Headers", "Modules"} {
-		p := filepath.Join(frameworkDir, dir)
-		if err := os.MkdirAll(p, 0755); err != nil {
-			return err
-		}
-	}
-	symlinks := [][2]string{
-		{"Versions/Current/Headers", "Headers"},
-		{"Versions/Current/Modules", "Modules"},
-		{"Versions/Current/" + framework, framework},
-		{"A", filepath.Join("Versions", "Current")},
-	}
-	for _, l := range symlinks {
-		if err := os.Symlink(l[0], filepath.Join(frameworkRoot, l[1])); err != nil && !os.IsExist(err) {
-			return err
-		}
-	}
-	exe := filepath.Join(frameworkDir, framework)
-	lipo := exec.Command("xcrun", "lipo", "-o", exe, "-create")
-	var builds errgroup.Group
-	tags := bi.tags
-	goos := "ios"
-	supportsIOS, err := supportsGOOS("ios")
-	if err != nil {
-		return err
-	}
-	if !supportsIOS {
-		// Go 1.15 and earlier target iOS with GOOS=darwin, tags=ios.
-		goos = "darwin"
-		tags = "ios " + tags
-	}
-	for _, a := range bi.archs {
-		clang, cflags, err := iosCompilerFor(target, a, bi.minsdk)
-		if err != nil {
-			return err
-		}
-		lib := filepath.Join(tmpDir, "gio-"+a)
-		cmd := exec.Command(
-			"go",
-			"build",
-			"-ldflags=-s -w "+bi.ldflags,
-			"-buildmode=c-archive",
-			"-o", lib,
-			"-tags", tags,
-			bi.pkgPath,
-		)
-		lipo.Args = append(lipo.Args, lib)
-		cflagsLine := strings.Join(cflags, " ")
-		cmd.Env = append(
-			os.Environ(),
-			"GOOS="+goos,
-			"GOARCH="+a,
-			"CGO_ENABLED=1",
-			"CC="+clang,
-			"CGO_CFLAGS="+cflagsLine,
-			"CGO_LDFLAGS="+cflagsLine,
-		)
-		builds.Go(func() error {
-			_, err := runCmd(cmd)
-			return err
-		})
-	}
-	if err := builds.Wait(); err != nil {
-		return err
-	}
-	if _, err := runCmd(lipo); err != nil {
-		return err
-	}
-	appDir, err := runCmd(exec.Command("go", "list", "-f", "{{.Dir}}", "gioui.org/app/"))
-	if err != nil {
-		return err
-	}
-	headerDst := filepath.Join(frameworkDir, "Headers", framework+".h")
-	headerSrc := filepath.Join(appDir, "framework_ios.h")
-	if err := copyFile(headerDst, headerSrc); err != nil {
-		return err
-	}
-	module := fmt.Sprintf(`framework module "%s" {
-    header "%[1]s.h"
-
-    export *
-}`, framework)
-	moduleFile := filepath.Join(frameworkDir, "Modules", "module.modulemap")
-	return ioutil.WriteFile(moduleFile, []byte(module), 0644)
-}
-
-func supportsGOOS(wantGoos string) (bool, error) {
-	geese, err := runCmd(exec.Command("go", "tool", "dist", "list"))
-	if err != nil {
-		return false, err
-	}
-	for _, pair := range strings.Split(geese, "\n") {
-		s := strings.SplitN(pair, "/", 2)
-		if len(s) != 2 {
-			return false, fmt.Errorf("go tool dist list: invalid GOOS/GOARCH pair: %s", pair)
-		}
-		goos := s[0]
-		if goos == wantGoos {
-			return true, nil
-		}
-	}
-	return false, nil
-}
-
-func iosCompilerFor(target, arch string, minsdk int) (string, []string, error) {
-	var (
-		platformSDK string
-		platformOS  string
-	)
-	switch target {
-	case "ios":
-		platformOS = "ios"
-		platformSDK = "iphone"
-	case "tvos":
-		platformOS = "tvos"
-		platformSDK = "appletv"
-	}
-	switch arch {
-	case "arm", "arm64":
-		platformSDK += "os"
-		if minsdk == 0 {
-			minsdk = minIOSVersion
-		}
-	case "386", "amd64":
-		platformOS += "-simulator"
-		platformSDK += "simulator"
-		if minsdk == 0 {
-			minsdk = minSimulatorVersion
-		}
-	default:
-		return "", nil, fmt.Errorf("unsupported -arch: %s", arch)
-	}
-	sdkPath, err := runCmd(exec.Command("xcrun", "--sdk", platformSDK, "--show-sdk-path"))
-	if err != nil {
-		return "", nil, err
-	}
-	clang, err := runCmd(exec.Command("xcrun", "--sdk", platformSDK, "--find", "clang"))
-	if err != nil {
-		return "", nil, err
-	}
-	cflags := []string{
-		"-fembed-bitcode",
-		"-arch", allArchs[arch].iosArch,
-		"-isysroot", sdkPath,
-		"-m" + platformOS + "-version-min=" + strconv.Itoa(minsdk),
-	}
-	return clang, cflags, nil
-}
-
-func zipDir(dst, base, dir string) (err error) {
-	f, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if cerr := f.Close(); err == nil {
-			err = cerr
-		}
-	}()
-	zipf := zip.NewWriter(f)
-	err = filepath.Walk(filepath.Join(base, dir), func(path string, f os.FileInfo, err error) error {
-		if err != nil {
-			return err
-		}
-		if f.IsDir() {
-			return nil
-		}
-		rel := filepath.ToSlash(path[len(base)+1:])
-		entry, err := zipf.Create(rel)
-		if err != nil {
-			return err
-		}
-		src, err := os.Open(path)
-		if err != nil {
-			return err
-		}
-		defer src.Close()
-		_, err = io.Copy(entry, src)
-		return err
-	})
-	if err != nil {
-		return err
-	}
-	return zipf.Close()
-}

cmd/gogio/js_test.go

@@ -1,123 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"bytes"
-	"context"
-	"errors"
-	"image"
-	"image/png"
-	"io"
-	"net/http"
-	"net/http/httptest"
-	"os/exec"
-
-	"github.com/chromedp/cdproto/runtime"
-	"github.com/chromedp/chromedp"
-
-	_ "gioui.org/unit" // the build tool adds it to go.mod, so keep it there
-)
-
-type JSTestDriver struct {
-	driverBase
-
-	// ctx is the chromedp context.
-	ctx context.Context
-}
-
-func (d *JSTestDriver) Start(path string) {
-	if raceEnabled {
-		d.Skipf("js/wasm doesn't support -race; skipping")
-	}
-
-	// First, build the app.
-	dir := d.tempDir("gio-endtoend-js")
-	d.gogio("-target=js", "-o="+dir, path)
-
-	// Second, start Chrome.
-	opts := append(chromedp.DefaultExecAllocatorOptions[:],
-		chromedp.Flag("headless", *headless),
-	)
-
-	actx, cancel := chromedp.NewExecAllocator(context.Background(), opts...)
-	d.Cleanup(cancel)
-
-	ctx, cancel := chromedp.NewContext(actx,
-		// Send all logf/errf calls to t.Logf
-		chromedp.WithLogf(d.Logf),
-	)
-	d.Cleanup(cancel)
-	d.ctx = ctx
-
-	if err := chromedp.Run(ctx); err != nil {
-		if errors.Is(err, exec.ErrNotFound) {
-			d.Skipf("test requires Chrome to be installed: %v", err)
-			return
-		}
-		d.Fatal(err)
-	}
-	pr, pw := io.Pipe()
-	d.Cleanup(func() { pw.Close() })
-	d.output = pr
-	chromedp.ListenTarget(ctx, func(ev interface{}) {
-		switch ev := ev.(type) {
-		case *runtime.EventConsoleAPICalled:
-			switch ev.Type {
-			case "log", "info", "warning", "error":
-				var b bytes.Buffer
-				b.WriteString("console.")
-				b.WriteString(string(ev.Type))
-				b.WriteString("(")
-				for i, arg := range ev.Args {
-					if i > 0 {
-						b.WriteString(", ")
-					}
-					b.Write(arg.Value)
-				}
-				b.WriteString(")\n")
-				pw.Write(b.Bytes())
-			}
-		}
-	})
-
-	// Third, serve the app folder, set the browser tab dimensions, and
-	// navigate to the folder.
-	ts := httptest.NewServer(http.FileServer(http.Dir(dir)))
-	d.Cleanup(ts.Close)
-
-	if err := chromedp.Run(ctx,
-		chromedp.EmulateViewport(int64(d.width), int64(d.height)),
-		chromedp.Navigate(ts.URL),
-	); err != nil {
-		d.Fatal(err)
-	}
-
-	// Wait for the gio app to render.
-	d.waitForFrame()
-}
-
-func (d *JSTestDriver) Screenshot() image.Image {
-	var buf []byte
-	if err := chromedp.Run(d.ctx,
-		chromedp.CaptureScreenshot(&buf),
-	); err != nil {
-		d.Fatal(err)
-	}
-	img, err := png.Decode(bytes.NewReader(buf))
-	if err != nil {
-		d.Fatal(err)
-	}
-	return img
-}
-
-func (d *JSTestDriver) Click(x, y int) {
-	if err := chromedp.Run(d.ctx,
-		chromedp.MouseClickXY(float64(x), float64(y)),
-	); err != nil {
-		d.Fatal(err)
-	}
-
-	// Wait for the gio app to render after this click.
-	d.waitForFrame()
-}

cmd/gogio/jsbuild.go

@@ -1,201 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strings"
-	"text/template"
-
-	"golang.org/x/tools/go/packages"
-)
-
-func buildJS(bi *buildInfo) error {
-	out := *destPath
-	if out == "" {
-		out = bi.name
-	}
-	if err := os.MkdirAll(out, 0700); err != nil {
-		return err
-	}
-	cmd := exec.Command(
-		"go",
-		"build",
-		"-ldflags="+bi.ldflags,
-		"-tags="+bi.tags,
-		"-o", filepath.Join(out, "main.wasm"),
-		bi.pkgPath,
-	)
-	cmd.Env = append(
-		os.Environ(),
-		"GOOS=js",
-		"GOARCH=wasm",
-	)
-	_, err := runCmd(cmd)
-	if err != nil {
-		return err
-	}
-
-	var faviconPath string
-	if _, err := os.Stat(bi.iconPath); err == nil {
-		// Copy icon to the output folder
-		icon, err := ioutil.ReadFile(bi.iconPath)
-		if err != nil {
-			return err
-		}
-		if err := ioutil.WriteFile(filepath.Join(out, filepath.Base(bi.iconPath)), icon, 0600); err != nil {
-			return err
-		}
-		faviconPath = filepath.Base(bi.iconPath)
-	}
-
-	indexTemplate, err := template.New("").Parse(jsIndex)
-	if err != nil {
-		return err
-	}
-
-	var b bytes.Buffer
-	if err := indexTemplate.Execute(&b, struct {
-		Name string
-		Icon string
-	}{
-		Name: bi.name,
-		Icon: faviconPath,
-	}); err != nil {
-		return err
-	}
-
-	if err := ioutil.WriteFile(filepath.Join(out, "index.html"), b.Bytes(), 0600); err != nil {
-		return err
-	}
-
-	goroot, err := runCmd(exec.Command("go", "env", "GOROOT"))
-	if err != nil {
-		return err
-	}
-	wasmJS := filepath.Join(goroot, "misc", "wasm", "wasm_exec.js")
-	if _, err := os.Stat(wasmJS); err != nil {
-		return fmt.Errorf("failed to find $GOROOT/misc/wasm/wasm_exec.js driver: %v", err)
-	}
-	pkgs, err := packages.Load(&packages.Config{
-		Mode: packages.NeedName | packages.NeedFiles | packages.NeedImports | packages.NeedDeps,
-		Env:  append(os.Environ(), "GOOS=js", "GOARCH=wasm"),
-	}, bi.pkgPath)
-	if err != nil {
-		return err
-	}
-	extraJS, err := findPackagesJS(pkgs[0], make(map[string]bool))
-	if err != nil {
-		return err
-	}
-
-	return mergeJSFiles(filepath.Join(out, "wasm.js"), append([]string{wasmJS}, extraJS...)...)
-}
-
-func findPackagesJS(p *packages.Package, visited map[string]bool) (extraJS []string, err error) {
-	if len(p.GoFiles) == 0 {
-		return nil, nil
-	}
-	js, err := filepath.Glob(filepath.Join(filepath.Dir(p.GoFiles[0]), "*_js.js"))
-	if err != nil {
-		return nil, err
-	}
-	extraJS = append(extraJS, js...)
-	for _, imp := range p.Imports {
-		if !visited[imp.ID] {
-			extra, err := findPackagesJS(imp, visited)
-			if err != nil {
-				return nil, err
-			}
-			extraJS = append(extraJS, extra...)
-			visited[imp.ID] = true
-		}
-	}
-	return extraJS, nil
-}
-
-// mergeJSFiles will merge all files into a single `wasm.js`. It will prepend the jsSetGo
-// and append the jsStartGo.
-func mergeJSFiles(dst string, files ...string) (err error) {
-	w, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if cerr := w.Close(); err != nil {
-			err = cerr
-		}
-	}()
-	_, err = io.Copy(w, strings.NewReader(jsSetGo))
-	if err != nil {
-		return err
-	}
-	for i := range files {
-		r, err := os.Open(files[i])
-		if err != nil {
-			return err
-		}
-		_, err = io.Copy(w, r)
-		r.Close()
-		if err != nil {
-			return err
-		}
-	}
-	_, err = io.Copy(w, strings.NewReader(jsStartGo))
-	return err
-}
-
-const (
-	jsIndex = `<!doctype html>
-<html>
-	<head>
-		<meta charset="utf-8">
-		<meta name="viewport" content="width=device-width, user-scalable=no">
-		<meta name="mobile-web-app-capable" content="yes">
-		{{ if .Icon }}<link rel="icon" href="{{.Icon}}" type="image/x-icon" />{{ end }}
-		{{ if .Name }}<title>{{.Name}}</title>{{ end }}
-		<script src="wasm.js"></script>
-		<style>
-			body,pre { margin:0;padding:0; }
-		</style>
-	</head>
-	<body>
-	</body>
-</html>`
-	// jsSetGo sets the `window.go` variable.
-	jsSetGo = `(() => {
-    window.go = {argv: [], env: {}, importObject: {go: {}}};
-	const argv = new URLSearchParams(location.search).get("argv");
-	if (argv) {
-		window.go["argv"] = argv.split(" ");
-	}
-})();`
-	// jsStartGo initializes the main.wasm.
-	jsStartGo = `(() => {
-	defaultGo = new Go();
-	Object.assign(defaultGo["argv"], defaultGo["argv"].concat(go["argv"]));
-	Object.assign(defaultGo["env"], go["env"]);
-	for (let key in go["importObject"]) {
-		if (typeof defaultGo["importObject"][key] === "undefined") {
-			defaultGo["importObject"][key] = {};
-		}
-		Object.assign(defaultGo["importObject"][key], go["importObject"][key]);
-	}
-	window.go = defaultGo;
-    if (!WebAssembly.instantiateStreaming) { // polyfill
-        WebAssembly.instantiateStreaming = async (resp, importObject) => {
-            const source = await (await resp).arrayBuffer();
-            return await WebAssembly.instantiate(source, importObject);
-        };
-    }
-    WebAssembly.instantiateStreaming(fetch("main.wasm"), go.importObject).then((result) => {
-        go.run(result.instance);
-    });
-})();`
-)

cmd/gogio/main.go

@@ -1,224 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main
-
-import (
-	"bytes"
-	"errors"
-	"flag"
-	"fmt"
-	"image"
-	"image/color"
-	"image/png"
-	"io"
-	"io/ioutil"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"strings"
-
-	"golang.org/x/image/draw"
-	"golang.org/x/sync/errgroup"
-)
-
-var (
-	target        = flag.String("target", "", "specify target (ios, tvos, android, js).\n")
-	archNames     = flag.String("arch", "", "specify architecture(s) to include (arm, arm64, amd64).")
-	minsdk        = flag.Int("minsdk", 0, "specify the minimum supported operating system level")
-	buildMode     = flag.String("buildmode", "exe", "specify buildmode (archive, exe)")
-	destPath      = flag.String("o", "", "output file or directory.\nFor -target ios or tvos, use the .app suffix to target simulators.")
-	appID         = flag.String("appid", "", "app identifier (for -buildmode=exe)")
-	version       = flag.Int("version", 1, "app version (for -buildmode=exe)")
-	printCommands = flag.Bool("x", false, "print the commands")
-	keepWorkdir   = flag.Bool("work", false, "print the name of the temporary work directory and do not delete it when exiting.")
-	linkMode      = flag.String("linkmode", "", "set the -linkmode flag of the go tool")
-	extraLdflags  = flag.String("ldflags", "", "extra flags to the Go linker")
-	extraTags     = flag.String("tags", "", "extra tags to the Go tool")
-	iconPath      = flag.String("icon", "", "specify an icon for iOS and Android")
-	signKey       = flag.String("signkey", "", "specify the path of the keystore to be used to sign Android apk files.")
-	signPass      = flag.String("signpass", "", "specify the password to decrypt the signkey.")
-)
-
-func main() {
-	flag.Usage = func() {
-		fmt.Fprint(os.Stderr, mainUsage)
-	}
-	flag.Parse()
-	if err := flagValidate(); err != nil {
-		fmt.Fprintf(os.Stderr, "gogio: %v\n", err)
-		os.Exit(1)
-	}
-	buildInfo, err := newBuildInfo(flag.Arg(0))
-	if err != nil {
-		fmt.Fprintf(os.Stderr, "gogio: %v\n", err)
-		os.Exit(1)
-	}
-	if err := build(buildInfo); err != nil {
-		fmt.Fprintf(os.Stderr, "gogio: %v\n", err)
-		os.Exit(1)
-	}
-	os.Exit(0)
-}
-
-func flagValidate() error {
-	pkgPathArg := flag.Arg(0)
-	if pkgPathArg == "" {
-		return errors.New("specify a package")
-	}
-	if *target == "" {
-		return errors.New("please specify -target")
-	}
-	switch *target {
-	case "ios", "tvos", "android", "js", "windows":
-	default:
-		return fmt.Errorf("invalid -target %s", *target)
-	}
-	switch *buildMode {
-	case "archive", "exe":
-	default:
-		return fmt.Errorf("invalid -buildmode %s", *buildMode)
-	}
-	return nil
-}
-
-func build(bi *buildInfo) error {
-	tmpDir, err := ioutil.TempDir("", "gogio-")
-	if err != nil {
-		return err
-	}
-	if *keepWorkdir {
-		fmt.Fprintf(os.Stderr, "WORKDIR=%s\n", tmpDir)
-	} else {
-		defer os.RemoveAll(tmpDir)
-	}
-	switch *target {
-	case "js":
-		return buildJS(bi)
-	case "ios", "tvos":
-		return buildIOS(tmpDir, *target, bi)
-	case "android":
-		return buildAndroid(tmpDir, bi)
-	case "windows":
-		return buildWindows(tmpDir, bi)
-	default:
-		panic("unreachable")
-	}
-}
-
-func runCmdRaw(cmd *exec.Cmd) ([]byte, error) {
-	if *printCommands {
-		fmt.Printf("%s\n", strings.Join(cmd.Args, " "))
-	}
-	out, err := cmd.Output()
-	if err == nil {
-		return out, nil
-	}
-	if err, ok := err.(*exec.ExitError); ok {
-		return nil, fmt.Errorf("%s failed: %s%s", strings.Join(cmd.Args, " "), out, err.Stderr)
-	}
-	return nil, err
-}
-
-func runCmd(cmd *exec.Cmd) (string, error) {
-	out, err := runCmdRaw(cmd)
-	return string(bytes.TrimSpace(out)), err
-}
-
-func copyFile(dst, src string) (err error) {
-	r, err := os.Open(src)
-	if err != nil {
-		return err
-	}
-	defer r.Close()
-	w, err := os.Create(dst)
-	if err != nil {
-		return err
-	}
-	defer func() {
-		if cerr := w.Close(); err == nil {
-			err = cerr
-		}
-	}()
-	_, err = io.Copy(w, r)
-	return err
-}
-
-type arch struct {
-	iosArch   string
-	jniArch   string
-	clangArch string
-}
-
-var allArchs = map[string]arch{
-	"arm": {
-		iosArch:   "armv7",
-		jniArch:   "armeabi-v7a",
-		clangArch: "armv7a-linux-androideabi",
-	},
-	"arm64": {
-		iosArch:   "arm64",
-		jniArch:   "arm64-v8a",
-		clangArch: "aarch64-linux-android",
-	},
-	"386": {
-		iosArch:   "i386",
-		jniArch:   "x86",
-		clangArch: "i686-linux-android",
-	},
-	"amd64": {
-		iosArch:   "x86_64",
-		jniArch:   "x86_64",
-		clangArch: "x86_64-linux-android",
-	},
-}
-
-type iconVariant struct {
-	path string
-	size int
-	fill bool
-}
-
-func buildIcons(baseDir, icon string, variants []iconVariant) error {
-	f, err := os.Open(icon)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-	img, _, err := image.Decode(f)
-	if err != nil {
-		return err
-	}
-	var resizes errgroup.Group
-	for _, v := range variants {
-		v := v
-		resizes.Go(func() (err error) {
-			path := filepath.Join(baseDir, v.path)
-			if err := os.MkdirAll(filepath.Dir(path), 0700); err != nil {
-				return err
-			}
-			f, err := os.Create(path)
-			if err != nil {
-				return err
-			}
-			defer func() {
-				if cerr := f.Close(); err == nil {
-					err = cerr
-				}
-			}()
-			return png.Encode(f, resizeIcon(v, img))
-		})
-	}
-	return resizes.Wait()
-}
-
-func resizeIcon(v iconVariant, img image.Image) *image.NRGBA {
-	scaled := image.NewNRGBA(image.Rectangle{Max: image.Point{X: v.size, Y: v.size}})
-	op := draw.Src
-	if v.fill {
-		op = draw.Over
-		draw.Draw(scaled, scaled.Bounds(), &image.Uniform{color.White}, image.Point{}, draw.Src)
-	}
-	draw.CatmullRom.Scale(scaled, scaled.Bounds(), img, img.Bounds(), op, nil)
-
-	return scaled
-}

cmd/gogio/main_test.go

@@ -1,17 +0,0 @@
-package main
-
-import (
-	"os"
-	"testing"
-)
-
-func TestMain(m *testing.M) {
-	if os.Getenv("RUN_GOGIO") != "" {
-		// Allow the end-to-end tests to call the gogio tool without
-		// having to build it from scratch, nor having to refactor the
-		// main function to avoid using global variables.
-		main()
-		os.Exit(0) // main already exits, but just in case.
-	}
-	os.Exit(m.Run())
-}

cmd/gogio/permission.go

@@ -1,33 +0,0 @@
-package main
-
-var AndroidPermissions = map[string][]string{
-	"network": {
-		"android.permission.INTERNET",
-	},
-	"networkstate": {
-		"android.permission.ACCESS_NETWORK_STATE",
-	},
-	"bluetooth": {
-		"android.permission.BLUETOOTH",
-		"android.permission.BLUETOOTH_ADMIN",
-		"android.permission.ACCESS_FINE_LOCATION",
-	},
-	"camera": {
-		"android.permission.CAMERA",
-	},
-	"storage": {
-		"android.permission.READ_EXTERNAL_STORAGE",
-		"android.permission.WRITE_EXTERNAL_STORAGE",
-	},
-}
-
-var AndroidFeatures = map[string][]string{
-	"default": {`glEsVersion="0x00020000"`, `name="android.hardware.type.pc"`},
-	"bluetooth": {
-		`name="android.hardware.bluetooth"`,
-		`name="android.hardware.bluetooth_le"`,
-	},
-	"camera": {
-		`name="android.hardware.camera"`,
-	},
-}

cmd/gogio/race_test.go

@@ -1,8 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-//go:build race
-// +build race
-
-package main_test
-
-func init() { raceEnabled = true }

cmd/gogio/testdata/testdata.go

@@ -1,142 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-// A simple app used for gogio's end-to-end tests.
-package main
-
-import (
-	"fmt"
-	"image"
-	"image/color"
-	"log"
-
-	"gioui.org/app"
-	"gioui.org/io/pointer"
-	"gioui.org/io/system"
-	"gioui.org/layout"
-	"gioui.org/op"
-	"gioui.org/op/clip"
-	"gioui.org/op/paint"
-)
-
-func main() {
-	go func() {
-		w := app.NewWindow()
-		if err := loop(w); err != nil {
-			log.Fatal(err)
-		}
-	}()
-	app.Main()
-}
-
-type notifyFrame int
-
-const (
-	notifyNone notifyFrame = iota
-	notifyInvalidate
-	notifyPrint
-)
-
-// notify keeps track of whether we want to print to stdout to notify the user
-// when a frame is ready. Initially we want to notify about the first frame.
-var notify = notifyInvalidate
-
-type (
-	C = layout.Context
-	D = layout.Dimensions
-)
-
-func loop(w *app.Window) error {
-	topLeft := quarterWidget{
-		color: color.NRGBA{R: 0xde, G: 0xad, B: 0xbe, A: 0xff},
-	}
-	topRight := quarterWidget{
-		color: color.NRGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff},
-	}
-	botLeft := quarterWidget{
-		color: color.NRGBA{R: 0x00, G: 0x00, B: 0x00, A: 0xff},
-	}
-	botRight := quarterWidget{
-		color: color.NRGBA{R: 0x00, G: 0x00, B: 0x00, A: 0x80},
-	}
-
-	var ops op.Ops
-	for {
-		e := <-w.Events()
-		switch e := e.(type) {
-		case system.DestroyEvent:
-			return e.Err
-		case system.FrameEvent:
-			gtx := layout.NewContext(&ops, e)
-			// Clear background to white, even on embedded platforms such as webassembly.
-			paint.Fill(gtx.Ops, color.NRGBA{A: 0xff, R: 0xff, G: 0xff, B: 0xff})
-			layout.Flex{Axis: layout.Vertical}.Layout(gtx,
-				layout.Flexed(1, func(gtx C) D {
-					return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
-						// r1c1
-						layout.Flexed(1, func(gtx C) D { return topLeft.Layout(gtx) }),
-						// r1c2
-						layout.Flexed(1, func(gtx C) D { return topRight.Layout(gtx) }),
-					)
-				}),
-				layout.Flexed(1, func(gtx C) D {
-					return layout.Flex{Axis: layout.Horizontal}.Layout(gtx,
-						// r2c1
-						layout.Flexed(1, func(gtx C) D { return botLeft.Layout(gtx) }),
-						// r2c2
-						layout.Flexed(1, func(gtx C) D { return botRight.Layout(gtx) }),
-					)
-				}),
-			)
-
-			e.Frame(gtx.Ops)
-
-			switch notify {
-			case notifyInvalidate:
-				notify = notifyPrint
-				w.Invalidate()
-			case notifyPrint:
-				notify = notifyNone
-				fmt.Println("gio frame ready")
-			}
-		}
-	}
-}
-
-// quarterWidget paints a quarter of the screen with one color. When clicked, it
-// turns red, going back to its normal color when clicked again.
-type quarterWidget struct {
-	color color.NRGBA
-
-	clicked bool
-}
-
-var red = color.NRGBA{R: 0xff, G: 0x00, B: 0x00, A: 0xff}
-
-func (w *quarterWidget) Layout(gtx layout.Context) layout.Dimensions {
-	var color color.NRGBA
-	if w.clicked {
-		color = red
-	} else {
-		color = w.color
-	}
-
-	r := image.Rectangle{Max: gtx.Constraints.Max}
-	paint.FillShape(gtx.Ops, color, clip.Rect(r).Op())
-
-	defer clip.Rect(image.Rectangle{
-		Max: image.Pt(gtx.Constraints.Max.X, gtx.Constraints.Max.Y),
-	}).Push(gtx.Ops).Pop()
-	pointer.InputOp{
-		Tag:   w,
-		Types: pointer.Press,
-	}.Add(gtx.Ops)
-
-	for _, e := range gtx.Events(w) {
-		if e, ok := e.(pointer.Event); ok && e.Type == pointer.Press {
-			w.clicked = !w.clicked
-			// notify when we're done updating the frame.
-			notify = notifyInvalidate
-		}
-	}
-	return layout.Dimensions{Size: gtx.Constraints.Max}
-}

cmd/gogio/wayland_test.go

@@ -1,196 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"bufio"
-	"bytes"
-	"context"
-	"fmt"
-	"image"
-	"image/png"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"regexp"
-	"strings"
-	"sync"
-	"text/template"
-	"time"
-)
-
-type WaylandTestDriver struct {
-	driverBase
-
-	runtimeDir string
-	socket     string
-	display    string
-}
-
-// No bars or anything fancy. Just a white background with our dimensions.
-var tmplSwayConfig = template.Must(template.New("").Parse(`
-output * bg #FFFFFF solid_color
-output * mode {{.Width}}x{{.Height}}
-default_border none
-`))
-
-var rxSwayReady = regexp.MustCompile(`Running compositor on wayland display '(.*)'`)
-
-func (d *WaylandTestDriver) Start(path string) {
-	// We want os.Environ, so that it can e.g. find $DISPLAY to run within
-	// X11. wlroots env vars are documented at:
-	// https://github.com/swaywm/wlroots/blob/master/docs/env_vars.md
-	env := os.Environ()
-	if *headless {
-		env = append(env, "WLR_BACKENDS=headless")
-	}
-
-	d.needPrograms(
-		"sway",    // to run a wayland compositor
-		"grim",    // to take screenshots
-		"swaymsg", // to send input
-	)
-
-	// First, build the app.
-	dir := d.tempDir("gio-endtoend-wayland")
-	bin := filepath.Join(dir, "red")
-	flags := []string{"build", "-tags", "nox11", "-o=" + bin}
-	if raceEnabled {
-		flags = append(flags, "-race")
-	}
-	flags = append(flags, path)
-	cmd := exec.Command("go", flags...)
-	if out, err := cmd.CombinedOutput(); err != nil {
-		d.Fatalf("could not build app: %s:\n%s", err, out)
-	}
-
-	conf := filepath.Join(dir, "config")
-	f, err := os.Create(conf)
-	if err != nil {
-		d.Fatal(err)
-	}
-	defer f.Close()
-	if err := tmplSwayConfig.Execute(f, struct{ Width, Height int }{
-		d.width, d.height,
-	}); err != nil {
-		d.Fatal(err)
-	}
-
-	d.socket = filepath.Join(dir, "socket")
-	env = append(env, "SWAYSOCK="+d.socket)
-	d.runtimeDir = dir
-	env = append(env, "XDG_RUNTIME_DIR="+d.runtimeDir)
-
-	var wg sync.WaitGroup
-	d.Cleanup(wg.Wait)
-
-	// First, start sway.
-	{
-		ctx, cancel := context.WithCancel(context.Background())
-		cmd := exec.CommandContext(ctx, "sway", "--config", conf, "--verbose")
-		cmd.Env = env
-		stderr, err := cmd.StderrPipe()
-		if err != nil {
-			d.Fatal(err)
-		}
-		if err := cmd.Start(); err != nil {
-			d.Fatal(err)
-		}
-		d.Cleanup(cancel)
-		d.Cleanup(func() {
-			// Give it a chance to exit gracefully, cleaning up
-			// after itself. After 10ms, the deferred cancel above
-			// will signal an os.Kill.
-			cmd.Process.Signal(os.Interrupt)
-			time.Sleep(10 * time.Millisecond)
-		})
-
-		// Wait for sway to be ready. We probably don't need a deadline
-		// here.
-		br := bufio.NewReader(stderr)
-		for {
-			line, err := br.ReadString('\n')
-			if err != nil {
-				d.Fatal(err)
-			}
-			if m := rxSwayReady.FindStringSubmatch(line); m != nil {
-				d.display = m[1]
-				break
-			}
-		}
-
-		wg.Add(1)
-		go func() {
-			if err := cmd.Wait(); err != nil && ctx.Err() == nil && !strings.Contains(err.Error(), "interrupt") {
-				// Don't print all stderr, since we use --verbose.
-				// TODO(mvdan): if it's useful, probably filter
-				// errors and show them.
-				d.Error(err)
-			}
-			wg.Done()
-		}()
-	}
-
-	// Then, start our program on the sway compositor above.
-	{
-		ctx, cancel := context.WithCancel(context.Background())
-		cmd := exec.CommandContext(ctx, bin)
-		cmd.Env = []string{"XDG_RUNTIME_DIR=" + d.runtimeDir, "WAYLAND_DISPLAY=" + d.display}
-		output, err := cmd.StdoutPipe()
-		if err != nil {
-			d.Fatal(err)
-		}
-		cmd.Stderr = cmd.Stdout
-		d.output = output
-		if err := cmd.Start(); err != nil {
-			d.Fatal(err)
-		}
-		d.Cleanup(cancel)
-		wg.Add(1)
-		go func() {
-			if err := cmd.Wait(); err != nil && ctx.Err() == nil {
-				d.Error(err)
-			}
-			wg.Done()
-		}()
-	}
-
-	// Wait for the gio app to render.
-	d.waitForFrame()
-}
-
-func (d *WaylandTestDriver) Screenshot() image.Image {
-	cmd := exec.Command("grim", "/dev/stdout")
-	cmd.Env = []string{"XDG_RUNTIME_DIR=" + d.runtimeDir, "WAYLAND_DISPLAY=" + d.display}
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		d.Errorf("%s", out)
-		d.Fatal(err)
-	}
-	img, err := png.Decode(bytes.NewReader(out))
-	if err != nil {
-		d.Fatal(err)
-	}
-	return img
-}
-
-func (d *WaylandTestDriver) swaymsg(args ...interface{}) {
-	strs := []string{"--socket", d.socket}
-	for _, arg := range args {
-		strs = append(strs, fmt.Sprint(arg))
-	}
-	cmd := exec.Command("swaymsg", strs...)
-	if out, err := cmd.CombinedOutput(); err != nil {
-		d.Errorf("%s", out)
-		d.Fatal(err)
-	}
-}
-
-func (d *WaylandTestDriver) Click(x, y int) {
-	d.swaymsg("seat", "-", "cursor", "set", x, y)
-	d.swaymsg("seat", "-", "cursor", "press", "button1")
-	d.swaymsg("seat", "-", "cursor", "release", "button1")
-
-	// Wait for the gio app to render after this click.
-	d.waitForFrame()
-}

cmd/gogio/windows_test.go

@@ -1,152 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"context"
-	"image"
-	"io"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"runtime"
-	"sync"
-	"time"
-
-	"golang.org/x/image/draw"
-)
-
-// Wine is tightly coupled with X11 at the moment, and we can reuse the same
-// methods to automate screenshots and clicks. The main difference is how we
-// build and run the app.
-
-// The only quirk is that it seems impossible for the Wine window to take the
-// entirety of the X server's dimensions, even if we try to resize it to take
-// the entire display. It seems to want to leave some vertical space empty,
-// presumably for window decorations or the "start" bar on Windows. To work
-// around that, make the X server 50x50px bigger, and crop the screenshots back
-// to the original size.
-
-type WineTestDriver struct {
-	X11TestDriver
-}
-
-func (d *WineTestDriver) Start(path string) {
-	d.needPrograms("wine")
-
-	// First, build the app.
-	bin := filepath.Join(d.tempDir("gio-endtoend-windows"), "red.exe")
-	flags := []string{"build", "-o=" + bin}
-	if raceEnabled {
-		if runtime.GOOS != "windows" {
-			// cross-compilation disables CGo, which breaks -race.
-			d.Skipf("can't cross-compile -race for Windows; skipping")
-		}
-		flags = append(flags, "-race")
-	}
-	flags = append(flags, path)
-	cmd := exec.Command("go", flags...)
-	cmd.Env = os.Environ()
-	cmd.Env = append(cmd.Env, "GOOS=windows")
-	if out, err := cmd.CombinedOutput(); err != nil {
-		d.Fatalf("could not build app: %s:\n%s", err, out)
-	}
-
-	var wg sync.WaitGroup
-	d.Cleanup(wg.Wait)
-
-	// Add 50x50px to the display dimensions, as discussed earlier.
-	d.startServer(&wg, d.width+50, d.height+50)
-
-	// Then, start our program via Wine on the X server above.
-	{
-		cacheDir, err := os.UserCacheDir()
-		if err != nil {
-			d.Fatal(err)
-		}
-		// Use a wine directory separate from the default ~/.wine, so
-		// that the user's winecfg doesn't affect our test. This will
-		// default to ~/.cache/gio-e2e-wine. We use the user's cache,
-		// to reuse a previously set up wineprefix.
-		wineprefix := filepath.Join(cacheDir, "gio-e2e-wine")
-
-		// First, ensure that wineprefix is up to date with wineboot.
-		// Wait for this separately from the first frame, as setting up
-		// a new prefix might take 5s on its own.
-		env := []string{
-			"DISPLAY=" + d.display,
-			"WINEDEBUG=fixme-all", // hide "fixme" noise
-			"WINEPREFIX=" + wineprefix,
-
-			// Disable wine-gecko (Explorer) and wine-mono (.NET).
-			// Otherwise, if not installed, wineboot will get stuck
-			// with a prompt to install them on the virtual X
-			// display. Moreover, Gio doesn't need either, and wine
-			// is faster without them.
-			"WINEDLLOVERRIDES=mscoree,mshtml=",
-		}
-		{
-			start := time.Now()
-			cmd := exec.Command("wine", "wineboot", "-i")
-			cmd.Env = env
-			// Use a combined output pipe instead of CombinedOutput,
-			// so that we only wait for the child process to exit,
-			// and we don't need to wait for all of wine's
-			// grandchildren to exit and stop writing. This is
-			// relevant as wine leaves "wineserver" lingering for
-			// three seconds by default, to be reused later.
-			stdout, err := cmd.StdoutPipe()
-			if err != nil {
-				d.Fatal(err)
-			}
-			cmd.Stderr = cmd.Stdout
-			if err := cmd.Run(); err != nil {
-				io.Copy(os.Stderr, stdout)
-				d.Fatal(err)
-			}
-			d.Logf("set up WINEPREFIX in %s", time.Since(start))
-		}
-
-		ctx, cancel := context.WithCancel(context.Background())
-		cmd := exec.CommandContext(ctx, "wine", bin)
-		cmd.Env = env
-		output, err := cmd.StdoutPipe()
-		if err != nil {
-			d.Fatal(err)
-		}
-		cmd.Stderr = cmd.Stdout
-		d.output = output
-		if err := cmd.Start(); err != nil {
-			d.Fatal(err)
-		}
-		d.Cleanup(cancel)
-		wg.Add(1)
-		go func() {
-			if err := cmd.Wait(); err != nil && ctx.Err() == nil {
-				d.Error(err)
-			}
-			wg.Done()
-		}()
-	}
-	// Wait for the gio app to render.
-	d.waitForFrame()
-
-	// xdotool seems to fail at actually moving the window if we use it
-	// immediately after Gio is ready. Why?
-	// We can't tell if the windowmove operation worked until we take a
-	// screenshot, because the getwindowgeometry op reports the 0x0
-	// coordinates even if the window wasn't moved properly.
-	// A sleep of ~20ms seems to be enough on an idle laptop. Use 20x that.
-	// TODO(mvdan): revisit this, when you have a spare three hours.
-	time.Sleep(400 * time.Millisecond)
-	id := d.xdotool("search", "--sync", "--onlyvisible", "--name", "Gio")
-	d.xdotool("windowmove", "--sync", id, 0, 0)
-}
-
-func (d *WineTestDriver) Screenshot() image.Image {
-	img := d.X11TestDriver.Screenshot()
-	// Crop the screenshot back to the original dimensions.
-	cropped := image.NewRGBA(image.Rect(0, 0, d.width, d.height))
-	draw.Draw(cropped, cropped.Bounds(), img, image.Point{}, draw.Src)
-	return cropped
-}

cmd/gogio/windowsbuild.go

@@ -1,416 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"image/png"
-	"io"
-	"math"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"reflect"
-	"strconv"
-	"strings"
-	"text/template"
-
-	"github.com/akavel/rsrc/binutil"
-	"github.com/akavel/rsrc/coff"
-	"golang.org/x/text/encoding/unicode"
-)
-
-func buildWindows(tmpDir string, bi *buildInfo) error {
-	builder := &windowsBuilder{TempDir: tmpDir}
-	builder.DestDir = *destPath
-	if builder.DestDir == "" {
-		builder.DestDir = bi.pkgPath
-	}
-
-	name := bi.name
-	if *destPath != "" {
-		if filepath.Ext(*destPath) != ".exe" {
-			return fmt.Errorf("invalid output name %q, it must end with `.exe`", *destPath)
-		}
-		name = filepath.Base(*destPath)
-	}
-	name = strings.TrimSuffix(name, ".exe")
-	sdk := bi.minsdk
-	if sdk > 10 {
-		return fmt.Errorf("invalid minsdk (%d) it's higher than Windows 10", sdk)
-	}
-	version := strconv.Itoa(bi.version)
-	if bi.version > math.MaxUint16 {
-		return fmt.Errorf("version (%d) is larger than the maximum (%d)", bi.version, math.MaxUint16)
-	}
-
-	for _, arch := range bi.archs {
-		builder.Coff = coff.NewRSRC()
-		builder.Coff.Arch(arch)
-
-		if err := builder.embedIcon(bi.iconPath); err != nil {
-			return err
-		}
-
-		if err := builder.embedManifest(windowsManifest{
-			Version:        "1.0.0." + version,
-			WindowsVersion: sdk,
-			Name:           name,
-		}); err != nil {
-			return fmt.Errorf("can't create manifest: %v", err)
-		}
-
-		if err := builder.embedInfo(windowsResources{
-			Version:      [2]uint32{uint32(1) << 16, uint32(bi.version)},
-			VersionHuman: "1.0.0." + version,
-			Name:         name,
-			Language:     0x0400, // Process Default Language: https://docs.microsoft.com/en-us/previous-versions/ms957130(v=msdn.10)
-		}); err != nil {
-			return fmt.Errorf("can't create info: %v", err)
-		}
-
-		if err := builder.buildResource(bi, name, arch); err != nil {
-			return fmt.Errorf("can't build the resources: %v", err)
-		}
-
-		if err := builder.buildProgram(bi, name, arch); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-type (
-	windowsResources struct {
-		Version      [2]uint32
-		VersionHuman string
-		Language     uint16
-		Name         string
-	}
-	windowsManifest struct {
-		Version        string
-		WindowsVersion int
-		Name           string
-	}
-	windowsBuilder struct {
-		TempDir string
-		DestDir string
-		Coff    *coff.Coff
-	}
-)
-
-const (
-	// https://docs.microsoft.com/en-us/windows/win32/menurc/resource-types
-	windowsResourceIcon      = 3
-	windowsResourceIconGroup = windowsResourceIcon + 11
-	windowsResourceManifest  = 24
-	windowsResourceVersion   = 16
-)
-
-type bufferCoff struct {
-	bytes.Buffer
-}
-
-func (b *bufferCoff) Size() int64 {
-	return int64(b.Len())
-}
-
-func (b *windowsBuilder) embedIcon(path string) (err error) {
-	iconFile, err := os.Open(path)
-	if err != nil {
-		if errors.Is(err, os.ErrNotExist) {
-			return nil
-		}
-		return fmt.Errorf("can't read the icon located at %s: %v", path, err)
-	}
-	defer iconFile.Close()
-
-	iconImage, err := png.Decode(iconFile)
-	if err != nil {
-		return fmt.Errorf("can't decode the PNG file (%s): %v", path, err)
-	}
-
-	sizes := []int{16, 32, 48, 64, 128, 256}
-	var iconHeader bufferCoff
-
-	// GRPICONDIR structure.
-	if err := binary.Write(&iconHeader, binary.LittleEndian, [3]uint16{0, 1, uint16(len(sizes))}); err != nil {
-		return err
-	}
-
-	for _, size := range sizes {
-		var iconBuffer bufferCoff
-
-		if err := png.Encode(&iconBuffer, resizeIcon(iconVariant{size: size, fill: false}, iconImage)); err != nil {
-			return fmt.Errorf("can't encode image: %v", err)
-		}
-
-		b.Coff.AddResource(windowsResourceIcon, uint16(size), &iconBuffer)
-
-		if err := binary.Write(&iconHeader, binary.LittleEndian, struct {
-			Size     [2]uint8
-			Color    [2]uint8
-			Planes   uint16
-			BitCount uint16
-			Length   uint32
-			Id       uint16
-		}{
-			Size:     [2]uint8{uint8(size % 256), uint8(size % 256)}, // "0" means 256px.
-			Planes:   1,
-			BitCount: 32,
-			Length:   uint32(iconBuffer.Len()),
-			Id:       uint16(size),
-		}); err != nil {
-			return err
-		}
-	}
-
-	b.Coff.AddResource(windowsResourceIconGroup, 1, &iconHeader)
-
-	return nil
-}
-
-func (b *windowsBuilder) buildResource(buildInfo *buildInfo, name string, arch string) error {
-	out, err := os.Create(filepath.Join(buildInfo.pkgPath, name+"_windows_"+arch+".syso"))
-	if err != nil {
-		return err
-	}
-	defer out.Close()
-	b.Coff.Freeze()
-
-	// See https://github.com/akavel/rsrc/internal/write.go#L13.
-	w := binutil.Writer{W: out}
-	binutil.Walk(b.Coff, func(v reflect.Value, path string) error {
-		if binutil.Plain(v.Kind()) {
-			w.WriteLE(v.Interface())
-			return nil
-		}
-		vv, ok := v.Interface().(binutil.SizedReader)
-		if ok {
-			w.WriteFromSized(vv)
-			return binutil.WALK_SKIP
-		}
-		return nil
-	})
-
-	if w.Err != nil {
-		return fmt.Errorf("error writing output file: %s", w.Err)
-	}
-
-	return nil
-}
-
-func (b *windowsBuilder) buildProgram(buildInfo *buildInfo, name string, arch string) error {
-	dest := b.DestDir
-	if len(buildInfo.archs) > 1 {
-		dest = filepath.Join(filepath.Dir(b.DestDir), name+"_"+arch+".exe")
-	}
-
-	cmd := exec.Command(
-		"go",
-		"build",
-		"-ldflags=-H=windowsgui "+buildInfo.ldflags,
-		"-tags="+buildInfo.tags,
-		"-o", dest,
-		buildInfo.pkgPath,
-	)
-	cmd.Env = append(
-		os.Environ(),
-		"GOOS=windows",
-		"GOARCH="+arch,
-	)
-	_, err := runCmd(cmd)
-	return err
-}
-
-func (b *windowsBuilder) embedManifest(v windowsManifest) error {
-	t, err := template.New("manifest").Parse(`<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
-    <assemblyIdentity type="win32" name="{{.Name}}" version="{{.Version}}" />
-    <description>{{.Name}}</description>
-    <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
-        <application>
-            {{if (le .WindowsVersion 10)}}<supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
-{{end}}
-            {{if (le .WindowsVersion 9)}}<supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
-{{end}}
-            {{if (le .WindowsVersion 8)}}<supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
-{{end}}
-            {{if (le .WindowsVersion 7)}}<supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
-{{end}}
-            {{if (le .WindowsVersion 6)}}<supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
-{{end}}
-        </application>
-    </compatibility>
-    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
-        <security>
-            <requestedPrivileges>
-                <requestedExecutionLevel level="asInvoker" uiAccess="false" />
-            </requestedPrivileges>
-        </security>
-    </trustInfo>
-	<asmv3:application>
-		<asmv3:windowsSettings>
-			<dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true</dpiAware>
-		</asmv3:windowsSettings>
-	</asmv3:application>
-</assembly>`)
-	if err != nil {
-		return err
-	}
-
-	var manifest bufferCoff
-	if err := t.Execute(&manifest, v); err != nil {
-		return err
-	}
-
-	b.Coff.AddResource(windowsResourceManifest, 1, &manifest)
-
-	return nil
-}
-
-func (b *windowsBuilder) embedInfo(v windowsResources) error {
-	page := uint16(1)
-
-	// https://docs.microsoft.com/pt-br/windows/win32/menurc/vs-versioninfo
-	t := newValue(valueBinary, "VS_VERSION_INFO", []io.WriterTo{
-		// https://docs.microsoft.com/pt-br/windows/win32/api/VerRsrc/ns-verrsrc-vs_fixedfileinfo
-		windowsInfoValueFixed{
-			Signature:      0xFEEF04BD,
-			StructVersion:  0x00010000,
-			FileVersion:    v.Version,
-			ProductVersion: v.Version,
-			FileFlagMask:   0x3F,
-			FileFlags:      0,
-			FileOS:         0x40004,
-			FileType:       0x1,
-			FileSubType:    0,
-		},
-		// https://docs.microsoft.com/pt-br/windows/win32/menurc/stringfileinfo
-		newValue(valueText, "StringFileInfo", []io.WriterTo{
-			// https://docs.microsoft.com/pt-br/windows/win32/menurc/stringtable
-			newValue(valueText, fmt.Sprintf("%04X%04X", v.Language, page), []io.WriterTo{
-				// https://docs.microsoft.com/pt-br/windows/win32/menurc/string-str
-				newValue(valueText, "ProductVersion", v.VersionHuman),
-				newValue(valueText, "FileVersion", v.VersionHuman),
-				newValue(valueText, "FileDescription", v.Name),
-				newValue(valueText, "ProductName", v.Name),
-				// TODO include more data: gogio must have some way to provide such information (like Company Name, Copyright...)
-			}),
-		}),
-		// https://docs.microsoft.com/pt-br/windows/win32/menurc/varfileinfo
-		newValue(valueBinary, "VarFileInfo", []io.WriterTo{
-			// https://docs.microsoft.com/pt-br/windows/win32/menurc/var-str
-			newValue(valueBinary, "Translation", uint32(page)<<16|uint32(v.Language)),
-		}),
-	})
-
-	// For some reason the ValueLength of the VS_VERSIONINFO must be the byte-length of `windowsInfoValueFixed`:
-	t.ValueLength = 52
-
-	var verrsrc bufferCoff
-	if _, err := t.WriteTo(&verrsrc); err != nil {
-		return err
-	}
-
-	b.Coff.AddResource(windowsResourceVersion, 1, &verrsrc)
-
-	return nil
-}
-
-type windowsInfoValueFixed struct {
-	Signature      uint32
-	StructVersion  uint32
-	FileVersion    [2]uint32
-	ProductVersion [2]uint32
-	FileFlagMask   uint32
-	FileFlags      uint32
-	FileOS         uint32
-	FileType       uint32
-	FileSubType    uint32
-	FileDate       [2]uint32
-}
-
-func (v windowsInfoValueFixed) WriteTo(w io.Writer) (_ int64, err error) {
-	return 0, binary.Write(w, binary.LittleEndian, v)
-}
-
-type windowsInfoValue struct {
-	Length      uint16
-	ValueLength uint16
-	Type        uint16
-	Key         []byte
-	Value       []byte
-}
-
-func (v windowsInfoValue) WriteTo(w io.Writer) (_ int64, err error) {
-	// binary.Write doesn't support []byte inside struct.
-	if err = binary.Write(w, binary.LittleEndian, [3]uint16{v.Length, v.ValueLength, v.Type}); err != nil {
-		return 0, err
-	}
-	if _, err = w.Write(v.Key); err != nil {
-		return 0, err
-	}
-	if _, err = w.Write(v.Value); err != nil {
-		return 0, err
-	}
-	return 0, nil
-}
-
-const (
-	valueBinary uint16 = 0
-	valueText   uint16 = 1
-)
-
-func newValue(valueType uint16, key string, input interface{}) windowsInfoValue {
-	v := windowsInfoValue{
-		Type:   valueType,
-		Length: 6,
-	}
-
-	padding := func(in []byte) []byte {
-		if l := uint16(len(in)) + v.Length; l%4 != 0 {
-			return append(in, make([]byte, 4-l%4)...)
-		}
-		return in
-	}
-
-	v.Key = padding(utf16Encode(key))
-	v.Length += uint16(len(v.Key))
-
-	switch in := input.(type) {
-	case string:
-		v.Value = padding(utf16Encode(in))
-		v.ValueLength = uint16(len(v.Value) / 2)
-	case []io.WriterTo:
-		var buff bytes.Buffer
-		for k := range in {
-			if _, err := in[k].WriteTo(&buff); err != nil {
-				panic(err)
-			}
-		}
-		v.Value = buff.Bytes()
-	default:
-		var buff bytes.Buffer
-		if err := binary.Write(&buff, binary.LittleEndian, in); err != nil {
-			panic(err)
-		}
-		v.ValueLength = uint16(buff.Len())
-		v.Value = buff.Bytes()
-	}
-
-	v.Length += uint16(len(v.Value))
-
-	return v
-}
-
-// utf16Encode encodes the string to UTF16 with null-termination.
-func utf16Encode(s string) []byte {
-	b, err := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM).NewEncoder().Bytes([]byte(s))
-	if err != nil {
-		panic(err)
-	}
-	return append(b, 0x00, 0x00) // null-termination.
-}

cmd/gogio/x11_test.go

@@ -1,170 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package main_test
-
-import (
-	"bytes"
-	"context"
-	"fmt"
-	"image"
-	"image/png"
-	"io"
-	"math/rand"
-	"os"
-	"os/exec"
-	"path/filepath"
-	"sync"
-	"time"
-)
-
-type X11TestDriver struct {
-	driverBase
-
-	display string
-}
-
-func (d *X11TestDriver) Start(path string) {
-	// First, build the app.
-	bin := filepath.Join(d.tempDir("gio-endtoend-x11"), "red")
-	flags := []string{"build", "-tags", "nowayland", "-o=" + bin}
-	if raceEnabled {
-		flags = append(flags, "-race")
-	}
-	flags = append(flags, path)
-	cmd := exec.Command("go", flags...)
-	if out, err := cmd.CombinedOutput(); err != nil {
-		d.Fatalf("could not build app: %s:\n%s", err, out)
-	}
-
-	var wg sync.WaitGroup
-	d.Cleanup(wg.Wait)
-
-	d.startServer(&wg, d.width, d.height)
-
-	// Then, start our program on the X server above.
-	{
-		ctx, cancel := context.WithCancel(context.Background())
-		cmd := exec.CommandContext(ctx, bin)
-		cmd.Env = []string{"DISPLAY=" + d.display}
-		output, err := cmd.StdoutPipe()
-		if err != nil {
-			d.Fatal(err)
-		}
-		cmd.Stderr = cmd.Stdout
-		d.output = output
-		if err := cmd.Start(); err != nil {
-			d.Fatal(err)
-		}
-		d.Cleanup(cancel)
-		wg.Add(1)
-		go func() {
-			if err := cmd.Wait(); err != nil && ctx.Err() == nil {
-				d.Error(err)
-			}
-			wg.Done()
-		}()
-	}
-
-	// Wait for the gio app to render.
-	d.waitForFrame()
-}
-
-func (d *X11TestDriver) startServer(wg *sync.WaitGroup, width, height int) {
-	// Pick a random display number between 1 and 100,000. Most machines
-	// will only be using :0, so there's only a 0.001% chance of two
-	// concurrent test runs to run into a conflict.
-	rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
-	d.display = fmt.Sprintf(":%d", rnd.Intn(100000)+1)
-
-	var xprog string
-	xflags := []string{
-		"-wr", // we want a white background; the default is black
-	}
-	if *headless {
-		xprog = "Xvfb" // virtual X server
-		xflags = append(xflags, "-screen", "0", fmt.Sprintf("%dx%dx24", width, height))
-	} else {
-		xprog = "Xephyr" // nested X server as a window
-		xflags = append(xflags, "-screen", fmt.Sprintf("%dx%d", width, height))
-	}
-	xflags = append(xflags, d.display)
-
-	d.needPrograms(
-		xprog,     // to run the X server
-		"scrot",   // to take screenshots
-		"xdotool", // to send input
-	)
-	ctx, cancel := context.WithCancel(context.Background())
-	cmd := exec.CommandContext(ctx, xprog, xflags...)
-	combined := &bytes.Buffer{}
-	cmd.Stdout = combined
-	cmd.Stderr = combined
-	if err := cmd.Start(); err != nil {
-		d.Fatal(err)
-	}
-	d.Cleanup(cancel)
-	d.Cleanup(func() {
-		// Give it a chance to exit gracefully, cleaning up
-		// after itself. After 10ms, the deferred cancel above
-		// will signal an os.Kill.
-		cmd.Process.Signal(os.Interrupt)
-		time.Sleep(10 * time.Millisecond)
-	})
-
-	// Wait for the X server to be ready. The socket path isn't
-	// terribly portable, but that's okay for now.
-	withRetries(d.T, time.Second, func() error {
-		socket := fmt.Sprintf("/tmp/.X11-unix/X%s", d.display[1:])
-		_, err := os.Stat(socket)
-		return err
-	})
-
-	wg.Add(1)
-	go func() {
-		if err := cmd.Wait(); err != nil && ctx.Err() == nil {
-			// Print all output and error.
-			io.Copy(os.Stdout, combined)
-			d.Error(err)
-		}
-		wg.Done()
-	}()
-}
-
-func (d *X11TestDriver) Screenshot() image.Image {
-	cmd := exec.Command("scrot", "--silent", "--overwrite", "/dev/stdout")
-	cmd.Env = []string{"DISPLAY=" + d.display}
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		d.Errorf("%s", out)
-		d.Fatal(err)
-	}
-	img, err := png.Decode(bytes.NewReader(out))
-	if err != nil {
-		d.Fatal(err)
-	}
-	return img
-}
-
-func (d *X11TestDriver) xdotool(args ...interface{}) string {
-	d.Helper()
-	strs := make([]string, len(args))
-	for i, arg := range args {
-		strs[i] = fmt.Sprint(arg)
-	}
-	cmd := exec.Command("xdotool", strs...)
-	cmd.Env = []string{"DISPLAY=" + d.display}
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		d.Errorf("%s", out)
-		d.Fatal(err)
-	}
-	return string(bytes.TrimSpace(out))
-}
-
-func (d *X11TestDriver) Click(x, y int) {
-	d.xdotool("mousemove", "--sync", x, y)
-	d.xdotool("click", "1")
-
-	// Wait for the gio app to render after this click.
-	d.waitForFrame()
-}

f32/affine.go

@@ -3,11 +3,11 @@
 package f32
 
 import (
-	"fmt"
 	"math"
+	"strconv"
 )
 
-// Affine2D represents an affine 2D transformation. The zero value if Affine2D
+// Affine2D represents an affine 2D transformation. The zero value of Affine2D
 // represents the identity transform.
 type Affine2D struct {
 	// in order to make the zero value of Affine2D represent the identity
@@ -112,6 +112,15 @@ func (a Affine2D) Elems() (sx, hx, ox, hy, sy, oy float32) {
 	return a.a + 1, a.b, a.c, a.d, a.e + 1, a.f
 }
 
+// Split a transform into two parts, one which is pure offset and the
+// other representing the scaling, shearing and rotation part.
+func (a *Affine2D) Split() (srs Affine2D, offset Point) {
+	return Affine2D{
+		a: a.a, b: a.b, c: 0,
+		d: a.d, e: a.e, f: 0,
+	}, Point{X: a.c, Y: a.f}
+}
+
 func (a Affine2D) scale(factor Point) Affine2D {
 	return Affine2D{
 		(a.a+1)*factor.X - 1, a.b * factor.X, a.c * factor.X,
@@ -139,5 +148,25 @@ func (a Affine2D) shear(radiansX, radiansY float32) Affine2D {
 
 func (a Affine2D) String() string {
 	sx, hx, ox, hy, sy, oy := a.Elems()
-	return fmt.Sprintf("[[%f %f %f] [%f %f %f]]", sx, hx, ox, hy, sy, oy)
+
+	// precision 6, one period, negative sign and space per number
+	const prec = 6
+	const charsPerFloat = prec + 2 + 1
+	s := make([]byte, 0, 6*charsPerFloat+6)
+
+	s = append(s, '[', '[')
+	s = strconv.AppendFloat(s, float64(sx), 'g', prec, 32)
+	s = append(s, ' ')
+	s = strconv.AppendFloat(s, float64(hx), 'g', prec, 32)
+	s = append(s, ' ')
+	s = strconv.AppendFloat(s, float64(ox), 'g', prec, 32)
+	s = append(s, ']', ' ', '[')
+	s = strconv.AppendFloat(s, float64(hy), 'g', prec, 32)
+	s = append(s, ' ')
+	s = strconv.AppendFloat(s, float64(sy), 'g', prec, 32)
+	s = append(s, ' ')
+	s = strconv.AppendFloat(s, float64(oy), 'g', prec, 32)
+	s = append(s, ']', ']')
+
+	return string(s)
 }

f32/affine_test.go

@@ -37,6 +37,29 @@ func TestTransformOffset(t *testing.T) {
 	}
 }
 
+func TestString(t *testing.T) {
+	tests := []struct {
+		in  Affine2D
+		exp string
+	}{
+		{
+			in:  NewAffine2D(9, 11, 13, 17, 19, 23),
+			exp: "[[9 11 13] [17 19 23]]",
+		}, {
+			in:  NewAffine2D(29, 31, 37, 43, 47, 53),
+			exp: "[[29 31 37] [43 47 53]]",
+		}, {
+			in:  NewAffine2D(29.142342, 31.4123412, 37.53152, 43.51324213, 47.123412, 53.14312342),
+			exp: "[[29.1423 31.4123 37.5315] [43.5132 47.1234 53.1431]]",
+		},
+	}
+	for _, test := range tests {
+		if test.in.String() != test.exp {
+			t.Errorf("string mismatch: have %q, want %q", test.in.String(), test.exp)
+		}
+	}
+}
+
 func TestTransformScale(t *testing.T) {
 	p := Point{X: 1, Y: 2}
 	s := Point{X: -1, Y: 2}

f32/f32.go

@@ -2,7 +2,7 @@
 
 /*
 Package f32 is a float32 implementation of package image's
-Point and Rectangle.
+Point and affine transformations.
 
 The coordinate space has the origin in the top left
 corner with the axes extending right and down.
@@ -26,30 +26,6 @@ func (p Point) String() string {
 		"," + strconv.FormatFloat(float64(p.Y), 'f', -1, 32) + ")"
 }
 
-// A Rectangle contains the points (X, Y) where Min.X <= X < Max.X,
-// Min.Y <= Y < Max.Y.
-type Rectangle struct {
-	Min, Max Point
-}
-
-// String return a string representation of r.
-func (r Rectangle) String() string {
-	return r.Min.String() + "-" + r.Max.String()
-}
-
-// Rect is a shorthand for Rectangle{Point{x0, y0}, Point{x1, y1}}.
-// The returned Rectangle has x0 and y0 swapped if necessary so that
-// it's correctly formed.
-func Rect(x0, y0, x1, y1 float32) Rectangle {
-	if x0 > x1 {
-		x0, x1 = x1, x0
-	}
-	if y0 > y1 {
-		y0, y1 = y1, y0
-	}
-	return Rectangle{Point{x0, y0}, Point{x1, y1}}
-}
-
 // Pt is shorthand for Point{X: x, Y: y}.
 func Pt(x, y float32) Point {
 	return Point{X: x, Y: y}
@@ -75,122 +51,10 @@ func (p Point) Div(s float32) Point {
 	return Point{X: p.X / s, Y: p.Y / s}
 }
 
-// In reports whether p is in r.
-func (p Point) In(r Rectangle) bool {
-	return r.Min.X <= p.X && p.X < r.Max.X &&
-		r.Min.Y <= p.Y && p.Y < r.Max.Y
-}
-
-// Size returns r's width and height.
-func (r Rectangle) Size() Point {
-	return Point{X: r.Dx(), Y: r.Dy()}
-}
-
-// Dx returns r's width.
-func (r Rectangle) Dx() float32 {
-	return r.Max.X - r.Min.X
-}
-
-// Dy returns r's Height.
-func (r Rectangle) Dy() float32 {
-	return r.Max.Y - r.Min.Y
-}
-
-// Intersect returns the intersection of r and s.
-func (r Rectangle) Intersect(s Rectangle) Rectangle {
-	if r.Min.X < s.Min.X {
-		r.Min.X = s.Min.X
-	}
-	if r.Min.Y < s.Min.Y {
-		r.Min.Y = s.Min.Y
-	}
-	if r.Max.X > s.Max.X {
-		r.Max.X = s.Max.X
-	}
-	if r.Max.Y > s.Max.Y {
-		r.Max.Y = s.Max.Y
-	}
-	if r.Empty() {
-		return Rectangle{}
-	}
-	return r
-}
-
-// Union returns the union of r and s.
-func (r Rectangle) Union(s Rectangle) Rectangle {
-	if r.Empty() {
-		return s
-	}
-	if s.Empty() {
-		return r
-	}
-	if r.Min.X > s.Min.X {
-		r.Min.X = s.Min.X
-	}
-	if r.Min.Y > s.Min.Y {
-		r.Min.Y = s.Min.Y
-	}
-	if r.Max.X < s.Max.X {
-		r.Max.X = s.Max.X
-	}
-	if r.Max.Y < s.Max.Y {
-		r.Max.Y = s.Max.Y
-	}
-	return r
-}
-
-// Canon returns the canonical version of r, where Min is to
-// the upper left of Max.
-func (r Rectangle) Canon() Rectangle {
-	if r.Max.X < r.Min.X {
-		r.Min.X, r.Max.X = r.Max.X, r.Min.X
-	}
-	if r.Max.Y < r.Min.Y {
-		r.Min.Y, r.Max.Y = r.Max.Y, r.Min.Y
-	}
-	return r
-}
-
-// Empty reports whether r represents the empty area.
-func (r Rectangle) Empty() bool {
-	return r.Min.X >= r.Max.X || r.Min.Y >= r.Max.Y
-}
-
-// Add offsets r with the vector p.
-func (r Rectangle) Add(p Point) Rectangle {
-	return Rectangle{
-		Point{r.Min.X + p.X, r.Min.Y + p.Y},
-		Point{r.Max.X + p.X, r.Max.Y + p.Y},
+// Round returns the integer point closest to p.
+func (p Point) Round() image.Point {
+	return image.Point{
+		X: int(math.Round(float64(p.X))),
+		Y: int(math.Round(float64(p.Y))),
 	}
 }
-
-// Sub offsets r with the vector -p.
-func (r Rectangle) Sub(p Point) Rectangle {
-	return Rectangle{
-		Point{r.Min.X - p.X, r.Min.Y - p.Y},
-		Point{r.Max.X - p.X, r.Max.Y - p.Y},
-	}
-}
-
-// Round returns the smallest integer rectangle that
-// contains r.
-func (r Rectangle) Round() image.Rectangle {
-	return image.Rectangle{
-		Min: image.Point{
-			X: int(floor(r.Min.X)),
-			Y: int(floor(r.Min.Y)),
-		},
-		Max: image.Point{
-			X: int(ceil(r.Max.X)),
-			Y: int(ceil(r.Max.Y)),
-		},
-	}
-}
-
-func ceil(v float32) int {
-	return int(math.Ceil(float64(v)))
-}
-
-func floor(v float32) int {
-	return int(math.Floor(float64(v)))
-}

flake.lock

@@ -3,17 +3,17 @@
     "android": {
       "inputs": {
         "devshell": "devshell",
-        "flake-utils": "flake-utils_2",
+        "flake-utils": "flake-utils",
         "nixpkgs": [
           "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1648412532,
-        "narHash": "sha256-zh0rLcppJ5i2Bh8oBWjBhDvgOrMhDGdXINbp3bhrs0U=",
+        "lastModified": 1701721028,
+        "narHash": "sha256-2z4YrdHPLoMZNWR1MPOjNZMqPg057i1eZXaYI6RTahQ=",
         "owner": "tadfisher",
         "repo": "android-nixpkgs",
-        "rev": "b1318b23926260685dbb09dd127f38c917fc7441",
+        "rev": "c923f9ec0f4dd0d7dc725dc5b73fbf03658e50dd",
         "type": "github"
       },
       "original": {
@@ -24,15 +24,18 @@
     },
     "devshell": {
       "inputs": {
-        "flake-utils": "flake-utils",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": [
+          "android",
+          "nixpkgs"
+        ],
+        "systems": "systems"
       },
       "locked": {
-        "lastModified": 1647857022,
-        "narHash": "sha256-Aw70NWLOIwKhT60MHDGjgWis3DP3faCzr6ap9CSayek=",
+        "lastModified": 1701697687,
+        "narHash": "sha256-dLLE5wQBVv+pIb4bWmKFSw2DvLVyuEk0F7ng6hpZPSU=",
         "owner": "numtide",
         "repo": "devshell",
-        "rev": "0a5ff74dacb9ea22614f64e61aeb3ca0bf0e7311",
+        "rev": "c3bd77911391eb1638af6ce773de86da57ee6df5",
         "type": "github"
       },
       "original": {
@@ -42,27 +45,15 @@
       }
     },
     "flake-utils": {
-      "locked": {
-        "lastModified": 1642700792,
-        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
-        "type": "github"
+      "inputs": {
+        "systems": "systems_2"
       },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
-    "flake-utils_2": {
       "locked": {
-        "lastModified": 1648297722,
-        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "lastModified": 1701680307,
+        "narHash": "sha256-kAuep2h5ajznlPMD9rnQyffWG8EM/C73lejGofXvdM8=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
+        "rev": "4022d587cbbfd70fe950c1e2083a02621806a725",
         "type": "github"
       },
       "original": {
@@ -73,31 +64,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1643381941,
-        "narHash": "sha256-pHTwvnN4tTsEKkWlXQ8JMY423epos8wUOhthpwJjtpc=",
+        "lastModified": 1701282334,
+        "narHash": "sha256-MxCVrXY6v4QmfTwIysjjaX0XUhqBbxTWWB4HXtDYsdk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5efc8ca954272c4376ac929f4c5ffefcc20551d5",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_2": {
-      "locked": {
-        "lastModified": 1648469949,
-        "narHash": "sha256-ExCG9k36QNs0bNsi2NwnfL4w/kjb661rW43pf03ok/Y=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "a63a39e23873d5d72753ff12bb418cb7e470790c",
+        "rev": "057f9aecfb71c4437d2b27d3323df7f93c010b7e",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
+        "ref": "23.11",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -105,7 +81,37 @@
     "root": {
       "inputs": {
         "android": "android",
-        "nixpkgs": "nixpkgs_2"
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
       }
     }
   },

flake.nix

@@ -3,7 +3,7 @@
   description = "Gio build environment";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs";
+    nixpkgs.url = "github:NixOS/nixpkgs/23.11";
     android.url = "github:tadfisher/android-nixpkgs";
     android.inputs.nixpkgs.follows = "nixpkgs";
   };
@@ -33,10 +33,10 @@
             default = with pkgs; mkShell
               ({
                 ANDROID_SDK_ROOT = "${android-sdk}/share/android-sdk";
-                JAVA_HOME = jdk8.home;
+                JAVA_HOME = jdk17.home;
                 packages = [
                   android-sdk
-                  jdk8
+                  jdk17
                   clang
                 ] ++ (if stdenv.isLinux then [
                   vulkan-headers
@@ -46,7 +46,13 @@
                   xorg.libXcursor
                   xorg.libXfixes
                   libGL
-                  pkgconfig
+                  pkg-config
+                ] else if stdenv.isDarwin then [
+                  darwin.apple_sdk_11_0.frameworks.Foundation
+                  darwin.apple_sdk_11_0.frameworks.Metal
+                  darwin.apple_sdk_11_0.frameworks.QuartzCore
+                  darwin.apple_sdk_11_0.frameworks.AppKit
+                  darwin.apple_sdk_11_0.MacOSX-SDK
                 ] else [ ]);
               } // (if stdenv.isLinux then {
                 LD_LIBRARY_PATH = "${vulkan-loader}/lib";

font/font.go

@@ -0,0 +1,126 @@
+/*
+Package font provides type describing font faces attributes.
+*/
+package font
+
+import (
+	"github.com/go-text/typesetting/font"
+)
+
+// A FontFace is a Font and a matching Face.
+type FontFace struct {
+	Font Font
+	Face Face
+}
+
+// Style is the font style.
+type Style int
+
+// Weight is a font weight, in CSS units subtracted 400 so the zero value
+// is normal text weight.
+type Weight int
+
+// Font specify a particular typeface variant, style and weight.
+type Font struct {
+	// Typeface specifies the name(s) of the the font faces to try. See [Typeface]
+	// for details.
+	Typeface Typeface
+	// Style specifies the kind of text style.
+	Style Style
+	// Weight is the text weight.
+	Weight Weight
+}
+
+// Face is an opaque handle to a typeface. The concrete implementation depends
+// upon the kind of font and shaper in use.
+type Face interface {
+	Face() font.Face
+}
+
+// Typeface identifies a list of font families to attempt to use for displaying
+// a string. The syntax is a comma-delimited list of family names. In order to
+// allow for the remote possibility of needing to express a font family name
+// containing a comma, name entries may be quoted using either single or double
+// quotes. Within quotes, a literal quotation mark can be expressed by escaping
+// it with `\`. A literal backslash may be expressed by escaping it with another
+// `\`.
+//
+// Here's an example Typeface:
+//
+//	Times New Roman, Georgia, serif
+//
+// This is equivalent to the above:
+//
+//	"Times New Roman", 'Georgia', serif
+//
+// Here are some valid uses of escape sequences:
+//
+//	"Contains a literal \" doublequote", 'Literal \' Singlequote', "\\ Literal backslash", '\\ another'
+//
+// This syntax has the happy side effect that most CSS "font-family" rules are
+// valid Typefaces (without the trailing semicolon).
+//
+// Generic CSS font families are supported, and are automatically expanded to lists
+// of known font families with a matching style. The supported generic families are:
+//
+//   - fantasy
+//   - math
+//   - emoji
+//   - serif
+//   - sans-serif
+//   - cursive
+//   - monospace
+type Typeface string
+
+const (
+	Regular Style = iota
+	Italic
+)
+
+const (
+	Thin       Weight = -300
+	ExtraLight Weight = -200
+	Light      Weight = -100
+	Normal     Weight = 0
+	Medium     Weight = 100
+	SemiBold   Weight = 200
+	Bold       Weight = 300
+	ExtraBold  Weight = 400
+	Black      Weight = 500
+)
+
+func (s Style) String() string {
+	switch s {
+	case Regular:
+		return "Regular"
+	case Italic:
+		return "Italic"
+	default:
+		panic("invalid Style")
+	}
+}
+
+func (w Weight) String() string {
+	switch w {
+	case Thin:
+		return "Thin"
+	case ExtraLight:
+		return "ExtraLight"
+	case Light:
+		return "Light"
+	case Normal:
+		return "Normal"
+	case Medium:
+		return "Medium"
+	case SemiBold:
+		return "SemiBold"
+	case Bold:
+		return "Bold"
+	case ExtraBold:
+		return "ExtraBold"
+	case Black:
+		return "Black"
+	default:
+		panic("invalid Weight")
+	}
+}

font/gofont/gofont.go

@@ -24,29 +24,49 @@ import (
 	"golang.org/x/image/font/gofont/gosmallcaps"
 	"golang.org/x/image/font/gofont/gosmallcapsitalic"
 
+	"gioui.org/font"
 	"gioui.org/font/opentype"
-	"gioui.org/text"
 )
 
 var (
+	regOnce    sync.Once
+	reg        []font.FontFace
 	once       sync.Once
-	collection []text.FontFace
+	collection []font.FontFace
 )
 
-func Collection() []text.FontFace {
+func loadRegular() {
+	regOnce.Do(func() {
+		faces, err := opentype.ParseCollection(goregular.TTF)
+		if err != nil {
+			panic(fmt.Errorf("failed to parse font: %v", err))
+		}
+		reg = faces
+		collection = append(collection, reg[0])
+	})
+}
+
+// Regular returns a collection of only the Go regular font face.
+func Regular() []font.FontFace {
+	loadRegular()
+	return reg
+}
+
+// Regular returns a collection of all available Go font faces.
+func Collection() []font.FontFace {
+	loadRegular()
 	once.Do(func() {
-		register(text.Font{}, goregular.TTF)
-		register(text.Font{Style: text.Italic}, goitalic.TTF)
-		register(text.Font{Weight: text.Bold}, gobold.TTF)
-		register(text.Font{Style: text.Italic, Weight: text.Bold}, gobolditalic.TTF)
-		register(text.Font{Weight: text.Medium}, gomedium.TTF)
-		register(text.Font{Weight: text.Medium, Style: text.Italic}, gomediumitalic.TTF)
-		register(text.Font{Variant: "Mono"}, gomono.TTF)
-		register(text.Font{Variant: "Mono", Weight: text.Bold}, gomonobold.TTF)
-		register(text.Font{Variant: "Mono", Weight: text.Bold, Style: text.Italic}, gomonobolditalic.TTF)
-		register(text.Font{Variant: "Mono", Style: text.Italic}, gomonoitalic.TTF)
-		register(text.Font{Variant: "Smallcaps"}, gosmallcaps.TTF)
-		register(text.Font{Variant: "Smallcaps", Style: text.Italic}, gosmallcapsitalic.TTF)
+		register(goitalic.TTF)
+		register(gobold.TTF)
+		register(gobolditalic.TTF)
+		register(gomedium.TTF)
+		register(gomediumitalic.TTF)
+		register(gomono.TTF)
+		register(gomonobold.TTF)
+		register(gomonobolditalic.TTF)
+		register(gomonoitalic.TTF)
+		register(gosmallcaps.TTF)
+		register(gosmallcapsitalic.TTF)
 		// Ensure that any outside appends will not reuse the backing store.
 		n := len(collection)
 		collection = collection[:n:n]
@@ -54,11 +74,10 @@ func Collection() []text.FontFace {
 	return collection
 }
 
-func register(fnt text.Font, ttf []byte) {
-	face, err := opentype.Parse(ttf)
+func register(ttf []byte) {
+	faces, err := opentype.ParseCollection(ttf)
 	if err != nil {
 		panic(fmt.Errorf("failed to parse font: %v", err))
 	}
-	fnt.Typeface = "Go"
-	collection = append(collection, text.FontFace{Font: fnt, Face: face})
+	collection = append(collection, faces[0])
 }

font/opentype/internal/shaping.go

@@ -1,530 +0,0 @@
-package internal
-
-import (
-	"io"
-
-	"gioui.org/io/system"
-	"gioui.org/text"
-	"github.com/benoitkugler/textlayout/language"
-	"github.com/gioui/uax/segment"
-	"github.com/gioui/uax/uax14"
-	"github.com/go-text/typesetting/di"
-	"github.com/go-text/typesetting/font"
-	"github.com/go-text/typesetting/shaping"
-	"golang.org/x/image/math/fixed"
-)
-
-// computeGlyphClusters populates the Clusters field of a Layout.
-// The order of the clusters is visual, meaning
-// that the first cluster is the leftmost cluster displayed even when
-// the cluster is part of RTL text.
-func computeGlyphClusters(l *text.Layout) {
-	clusters := make([]text.GlyphCluster, 0, len(l.Glyphs)+1)
-	if len(l.Glyphs) < 1 {
-		if l.Runes.Count > 0 {
-			// Empty line corresponding to a newline character.
-			clusters = append(clusters, text.GlyphCluster{
-				Runes: text.Range{
-					Count:  1,
-					Offset: l.Runes.Offset,
-				},
-			})
-		}
-		l.Clusters = clusters
-		return
-	}
-	rtl := l.Direction == system.RTL
-
-	// Check for trailing whitespace characters and synthesize
-	// GlyphClusters to represent them.
-	lastGlyph := l.Glyphs[len(l.Glyphs)-1]
-	if rtl {
-		lastGlyph = l.Glyphs[0]
-	}
-	trailingNewline := lastGlyph.ClusterIndex+lastGlyph.RuneCount < l.Runes.Count+l.Runes.Offset
-	newlineCluster := text.GlyphCluster{
-		Runes: text.Range{
-			Count:  1,
-			Offset: l.Runes.Count + l.Runes.Offset - 1,
-		},
-		Glyphs: text.Range{
-			Offset: len(l.Glyphs),
-		},
-	}
-
-	var (
-		i               int = 0
-		inc             int = 1
-		runesProcessed  int = 0
-		glyphsProcessed int = 0
-	)
-
-	if rtl {
-		i = len(l.Glyphs) - 1
-		inc = -inc
-		glyphsProcessed = len(l.Glyphs) - 1
-		newlineCluster.Glyphs.Offset = 0
-	}
-	// Construct clusters from the line's glyphs.
-	for ; i < len(l.Glyphs) && i >= 0; i += inc {
-		g := l.Glyphs[i]
-		xAdv := g.XAdvance * fixed.Int26_6(inc)
-		for k := 0; k < g.GlyphCount-1 && k < len(l.Glyphs); k++ {
-			i += inc
-			xAdv += l.Glyphs[i].XAdvance * fixed.Int26_6(inc)
-		}
-
-		startRune := runesProcessed
-		runeIncrement := g.RuneCount
-		startGlyph := glyphsProcessed
-		glyphIncrement := g.GlyphCount * inc
-		if rtl {
-			startGlyph = glyphsProcessed + glyphIncrement + 1
-		}
-		clusters = append(clusters, text.GlyphCluster{
-			Advance: xAdv,
-			Runes: text.Range{
-				Count:  g.RuneCount,
-				Offset: startRune + l.Runes.Offset,
-			},
-			Glyphs: text.Range{
-				Count:  g.GlyphCount,
-				Offset: startGlyph,
-			},
-		})
-		runesProcessed += runeIncrement
-		glyphsProcessed += glyphIncrement
-	}
-	// Insert synthetic clusters at the right edge of the line.
-	if trailingNewline {
-		clusters = append(clusters, newlineCluster)
-	}
-	l.Clusters = clusters
-	return
-}
-
-// langConfig describes the language and writing system of a body of text.
-type langConfig struct {
-	// Language the text is written in.
-	language.Language
-	// Writing system used to represent the text.
-	language.Script
-	// Direction of the text, usually driven by the writing system.
-	di.Direction
-}
-
-// mapRunesToClusterIndices returns a slice. Each index within that slice corresponds
-// to an index within the runes input slice. The value stored at that index is the
-// index of the glyph at the start of the corresponding glyph cluster shaped by
-// harfbuzz.
-func mapRunesToClusterIndices(runes []rune, glyphs []shaping.Glyph) []int {
-	mapping := make([]int, len(runes))
-	glyphCursor := 0
-	if len(runes) == 0 {
-		return nil
-	}
-	// If the final cluster values are lower than the starting ones,
-	// the text is RTL.
-	rtl := len(glyphs) > 0 && glyphs[len(glyphs)-1].ClusterIndex < glyphs[0].ClusterIndex
-	if rtl {
-		glyphCursor = len(glyphs) - 1
-	}
-	for i := range runes {
-		for glyphCursor >= 0 && glyphCursor < len(glyphs) &&
-			((rtl && glyphs[glyphCursor].ClusterIndex <= i) ||
-				(!rtl && glyphs[glyphCursor].ClusterIndex < i)) {
-			if rtl {
-				glyphCursor--
-			} else {
-				glyphCursor++
-			}
-		}
-		if rtl {
-			glyphCursor++
-		} else if (glyphCursor >= 0 && glyphCursor < len(glyphs) &&
-			glyphs[glyphCursor].ClusterIndex > i) ||
-			(glyphCursor == len(glyphs) && len(glyphs) > 1) {
-			glyphCursor--
-			targetClusterIndex := glyphs[glyphCursor].ClusterIndex
-			for glyphCursor-1 >= 0 && glyphs[glyphCursor-1].ClusterIndex == targetClusterIndex {
-				glyphCursor--
-			}
-		}
-		if glyphCursor < 0 {
-			glyphCursor = 0
-		} else if glyphCursor >= len(glyphs) {
-			glyphCursor = len(glyphs) - 1
-		}
-		mapping[i] = glyphCursor
-	}
-	return mapping
-}
-
-// inclusiveGlyphRange returns the inclusive range of runes and glyphs matching
-// the provided start and breakAfter rune positions.
-// runeToGlyph must be a valid mapping from the rune representation to the
-// glyph reprsentation produced by mapRunesToClusterIndices.
-// numGlyphs is the number of glyphs in the output representing the runes
-// under consideration.
-func inclusiveGlyphRange(start, breakAfter int, runeToGlyph []int, numGlyphs int) (glyphStart, glyphEnd int) {
-	rtl := runeToGlyph[len(runeToGlyph)-1] < runeToGlyph[0]
-	runeStart := start
-	runeEnd := breakAfter
-	if rtl {
-		glyphStart = runeToGlyph[runeEnd]
-		if runeStart-1 >= 0 {
-			glyphEnd = runeToGlyph[runeStart-1] - 1
-		} else {
-			glyphEnd = numGlyphs - 1
-		}
-	} else {
-		glyphStart = runeToGlyph[runeStart]
-		if runeEnd+1 < len(runeToGlyph) {
-			glyphEnd = runeToGlyph[runeEnd+1] - 1
-		} else {
-			glyphEnd = numGlyphs - 1
-		}
-	}
-	return
-}
-
-// breakOption represets a location within the rune slice at which
-// it may be safe to break a line of text.
-type breakOption struct {
-	// breakAtRune is the index at which it is safe to break.
-	breakAtRune int
-	// penalty is the cost of breaking at this index. Negative
-	// penalties mean that the break is beneficial, and a penalty
-	// of uax14.PenaltyForMustBreak means a required break.
-	penalty int
-}
-
-// getBreakOptions returns a slice of line break candidates for the
-// text in the provided slice.
-func getBreakOptions(text []rune) []breakOption {
-	// Collect options for breaking the lines in a slice.
-	var options []breakOption
-	const adjust = -1
-	breaker := uax14.NewLineWrap()
-	segmenter := segment.NewSegmenter(breaker)
-	segmenter.InitFromSlice(text)
-	runeOffset := 0
-	brokeAtEnd := false
-	for segmenter.Next() {
-		penalty, _ := segmenter.Penalties()
-		// Determine the indices of the breaking runes in the runes
-		// slice. Would be nice if the API provided this.
-		currentSegment := segmenter.Runes()
-		runeOffset += len(currentSegment)
-
-		// Collect all break options.
-		options = append(options, breakOption{
-			penalty:     penalty,
-			breakAtRune: runeOffset + adjust,
-		})
-		if options[len(options)-1].breakAtRune == len(text)-1 {
-			brokeAtEnd = true
-		}
-	}
-	if len(text) > 0 && !brokeAtEnd {
-		options = append(options, breakOption{
-			penalty:     uax14.PenaltyForMustBreak,
-			breakAtRune: len(text) - 1,
-		})
-	}
-	return options
-}
-
-type Shaper func(shaping.Input) (shaping.Output, error)
-
-// paragraph shapes a single paragraph of text, breaking it into multiple lines
-// to fit within the provided maxWidth.
-func paragraph(shaper Shaper, face font.Face, ppem fixed.Int26_6, maxWidth int, lc langConfig, paragraph []rune) ([]output, error) {
-	// TODO: handle splitting bidi text here
-
-	// Shape the text.
-	input := toInput(face, ppem, lc, paragraph)
-	out, err := shaper(input)
-	if err != nil {
-		return nil, err
-	}
-	// Get a mapping from input runes to output glyphs.
-	runeToGlyph := mapRunesToClusterIndices(paragraph, out.Glyphs)
-
-	// Fetch line break candidates.
-	breaks := getBreakOptions(paragraph)
-
-	return lineWrap(out, input.Direction, paragraph, runeToGlyph, breaks, maxWidth), nil
-}
-
-// shouldKeepSegmentOnLine decides whether the segment of text from the current
-// end of the line to the provided breakOption should be kept on the current
-// line. It should be called successively with each available breakOption,
-// and the line should be broken (without keeping the current segment)
-// whenever it returns false.
-//
-// The parameters require some explanation:
-// out - the shaping.Output that is being line-broken.
-// runeToGlyph - a mapping where accessing the slice at the index of a rune
-//     int out will yield the index of the first glyph corresponding to that rune.
-// lineStartRune - the index of the first rune in the line.
-// b - the line break candidate under consideration.
-// curLineWidth - the amount of space total in the current line.
-// curLineUsed - the amount of space in the current line that is already used.
-// nextLineWidth - the amount of space available on the next line.
-//
-// This function returns both a valid shaping.Output broken at b and a boolean
-// indicating whether the returned output should be used.
-func shouldKeepSegmentOnLine(out shaping.Output, runeToGlyph []int, lineStartRune int, b breakOption, curLineWidth, curLineUsed, nextLineWidth int) (candidateLine shaping.Output, keep bool) {
-	// Convert the break target to an inclusive index.
-	glyphStart, glyphEnd := inclusiveGlyphRange(lineStartRune, b.breakAtRune, runeToGlyph, len(out.Glyphs))
-
-	// Construct a line out of the inclusive glyph range.
-	candidateLine = out
-	candidateLine.Glyphs = candidateLine.Glyphs[glyphStart : glyphEnd+1]
-	candidateLine.RecomputeAdvance()
-	candidateAdvance := candidateLine.Advance.Ceil()
-	if candidateAdvance > curLineWidth && candidateAdvance-curLineUsed <= nextLineWidth {
-		// If it fits on the next line, put it there.
-		return candidateLine, false
-	}
-
-	return candidateLine, true
-}
-
-// lineWrap wraps the shaped glyphs of a paragraph to a particular max width.
-func lineWrap(out shaping.Output, dir di.Direction, paragraph []rune, runeToGlyph []int, breaks []breakOption, maxWidth int) []output {
-	var outputs []output
-	if len(breaks) == 0 {
-		// Pass empty lines through as empty.
-		outputs = append(outputs, output{
-			Shaped: out,
-			RuneRange: text.Range{
-				Count: len(paragraph),
-			},
-		})
-		return outputs
-	}
-
-	for i := 0; i < len(breaks); i++ {
-		b := breaks[i]
-		if b.breakAtRune+1 < len(runeToGlyph) {
-			// Check if this break is valid.
-			gIdx := runeToGlyph[b.breakAtRune]
-			g2Idx := runeToGlyph[b.breakAtRune+1]
-			cIdx := out.Glyphs[gIdx].ClusterIndex
-			c2Idx := out.Glyphs[g2Idx].ClusterIndex
-			if cIdx == c2Idx {
-				// This break is within a harfbuzz cluster, and is
-				// therefore invalid.
-				copy(breaks[i:], breaks[i+1:])
-				breaks = breaks[:len(breaks)-1]
-				i--
-			}
-		}
-	}
-
-	start := 0
-	runesProcessed := 0
-	for i := 0; i < len(breaks); i++ {
-		b := breaks[i]
-		// Always keep the first segment on a line.
-		good, _ := shouldKeepSegmentOnLine(out, runeToGlyph, start, b, maxWidth, 0, maxWidth)
-		end := b.breakAtRune
-	innerLoop:
-		for k := i + 1; k < len(breaks); k++ {
-			bb := breaks[k]
-			candidate, ok := shouldKeepSegmentOnLine(out, runeToGlyph, start, bb, maxWidth, good.Advance.Ceil(), maxWidth)
-			if ok {
-				// Use this new, longer segment.
-				good = candidate
-				end = bb.breakAtRune
-				i++
-			} else {
-				break innerLoop
-			}
-		}
-		numRunes := end - start + 1
-		outputs = append(outputs, output{
-			Shaped: good,
-			RuneRange: text.Range{
-				Count:  numRunes,
-				Offset: runesProcessed,
-			},
-		})
-		runesProcessed += numRunes
-		start = end + 1
-	}
-	return outputs
-}
-
-// output is a run of shaped text with metadata about its position
-// within a text document.
-type output struct {
-	Shaped    shaping.Output
-	RuneRange text.Range
-}
-
-func toSystemDirection(d di.Direction) system.TextDirection {
-	switch d {
-	case di.DirectionLTR:
-		return system.LTR
-	case di.DirectionRTL:
-		return system.RTL
-	}
-	return system.LTR
-}
-
-// toGioGlyphs converts text shaper glyphs into the minimal representation
-// that Gio needs.
-func toGioGlyphs(in []shaping.Glyph) []text.Glyph {
-	out := make([]text.Glyph, 0, len(in))
-	for _, g := range in {
-		out = append(out, text.Glyph{
-			ID:           g.GlyphID,
-			ClusterIndex: g.ClusterIndex,
-			RuneCount:    g.RuneCount,
-			GlyphCount:   g.GlyphCount,
-			XAdvance:     g.XAdvance,
-			YAdvance:     g.YAdvance,
-			XOffset:      g.XOffset,
-			YOffset:      g.YOffset,
-		})
-	}
-	return out
-}
-
-// ToLine converts the output into a text.Line
-func (o output) ToLine() text.Line {
-	advances := make([]fixed.Int26_6, 0, len(o.Shaped.Glyphs))
-	for _, glyph := range o.Shaped.Glyphs {
-		advances = append(advances, glyph.XAdvance)
-	}
-	layout := text.Layout{
-		Glyphs:    toGioGlyphs(o.Shaped.Glyphs),
-		Runes:     o.RuneRange,
-		Direction: toSystemDirection(o.Shaped.Direction),
-	}
-	return text.Line{
-		Layout: layout,
-		Bounds: fixed.Rectangle26_6{
-			Min: fixed.Point26_6{
-				Y: -o.Shaped.LineBounds.Ascent,
-			},
-			Max: fixed.Point26_6{
-				X: o.Shaped.Advance,
-				Y: -o.Shaped.LineBounds.Ascent + o.Shaped.LineBounds.LineHeight(),
-			},
-		},
-		Width:   o.Shaped.Advance,
-		Ascent:  o.Shaped.LineBounds.Ascent,
-		Descent: -o.Shaped.LineBounds.Descent + o.Shaped.LineBounds.Gap,
-	}
-}
-
-func mapDirection(d system.TextDirection) di.Direction {
-	switch d {
-	case system.LTR:
-		return di.DirectionLTR
-	case system.RTL:
-		return di.DirectionRTL
-	}
-	return di.DirectionLTR
-}
-
-// Document shapes text using the given font, ppem, maximum line width, language,
-// and sequence of runes. It returns a slice of lines corresponding to the txt,
-// broken to fit within maxWidth and on paragraph boundaries.
-func Document(shaper Shaper, face font.Face, ppem fixed.Int26_6, maxWidth int, lc system.Locale, txt io.RuneReader) []text.Line {
-	var (
-		outputs       []text.Line
-		startByte     int
-		startRune     int
-		paragraphText []rune
-		done          bool
-		langs         = make(map[language.Script]int)
-	)
-	for !done {
-		var (
-			bytes int
-			runes int
-		)
-		newlineAdjust := 0
-	paragraphLoop:
-		for r, sz, re := txt.ReadRune(); !done; r, sz, re = txt.ReadRune() {
-			if re != nil {
-				done = true
-				continue
-			}
-			paragraphText = append(paragraphText, r)
-			script := language.LookupScript(r)
-			if _, ok := langs[script]; ok {
-				langs[script]++
-			} else {
-				langs[script] = 1
-			}
-			bytes += sz
-			runes++
-			if r == '\n' {
-				newlineAdjust = 1
-				break paragraphLoop
-			}
-		}
-		var (
-			primary      language.Script
-			primaryTotal int
-		)
-		for script, total := range langs {
-			if total > primaryTotal {
-				primary = script
-				primaryTotal = total
-			}
-		}
-		if lc.Language == "" {
-			lc.Language = "EN"
-		}
-		lcfg := langConfig{
-			Language:  language.NewLanguage(lc.Language),
-			Script:    primary,
-			Direction: mapDirection(lc.Direction),
-		}
-		lines, _ := paragraph(shaper, face, ppem, maxWidth, lcfg, paragraphText[:len(paragraphText)-newlineAdjust])
-		for i := range lines {
-			// Update the offsets of each paragraph to be correct within the
-			// whole document.
-			lines[i].RuneRange.Offset += startRune
-			// Update the cluster values to be rune indices within the entire
-			// document.
-			for k := range lines[i].Shaped.Glyphs {
-				lines[i].Shaped.Glyphs[k].ClusterIndex += startRune
-			}
-			outputs = append(outputs, lines[i].ToLine())
-		}
-		// If there was a trailing newline update the byte counts to include
-		// it on the last line of the paragraph.
-		if newlineAdjust > 0 {
-			outputs[len(outputs)-1].Layout.Runes.Count += newlineAdjust
-		}
-		paragraphText = paragraphText[:0]
-		startByte += bytes
-		startRune += runes
-	}
-	for i := range outputs {
-		computeGlyphClusters(&outputs[i].Layout)
-	}
-	return outputs
-}
-
-// toInput converts its parameters into a shaping.Input.
-func toInput(face font.Face, ppem fixed.Int26_6, lc langConfig, runes []rune) shaping.Input {
-	var input shaping.Input
-	input.Direction = lc.Direction
-	input.Text = runes
-	input.Size = ppem
-	input.Face = face
-	input.Language = lc.Language
-	input.Script = lc.Script
-	input.RunStart = 0
-	input.RunEnd = len(runes)
-	return input
-}

font/opentype/opentype.go

@@ -2,137 +2,191 @@
 
 // Package opentype implements text layout and shaping for OpenType
 // files.
+//
+// NOTE: the OpenType specification allows for fonts to include bitmap images
+// in a variety of formats. In the interest of small binary sizes, the opentype
+// package only automatically imports the PNG image decoder. If you have a font
+// with glyphs in JPEG or TIFF formats, register those decoders with the image
+// package in order to ensure those glyphs are visible in text.
 package opentype
 
 import (
 	"bytes"
 	"fmt"
-	"image"
-	"io"
+	_ "image/png"
 
-	"github.com/benoitkugler/textlayout/fonts"
-	"github.com/benoitkugler/textlayout/fonts/truetype"
-	"github.com/benoitkugler/textlayout/harfbuzz"
-	"github.com/go-text/typesetting/shaping"
-	"golang.org/x/image/font"
-	"golang.org/x/image/math/fixed"
-
-	"gioui.org/f32"
-	"gioui.org/font/opentype/internal"
-	"gioui.org/io/system"
-	"gioui.org/op"
-	"gioui.org/op/clip"
-	"gioui.org/text"
+	giofont "gioui.org/font"
+	"github.com/go-text/typesetting/font"
+	fontapi "github.com/go-text/typesetting/opentype/api/font"
+	"github.com/go-text/typesetting/opentype/api/metadata"
+	"github.com/go-text/typesetting/opentype/loader"
 )
 
-// Font implements the text.Shaper interface using a rich text
-// shaping engine.
-type Font struct {
-	font *truetype.Font
+// Face is a thread-safe representation of a loaded font. For efficiency, applications
+// should construct a face for any given font file once, reusing it across different
+// text shapers.
+type Face struct {
+	face font.Font
+	font giofont.Font
 }
 
-// Parse constructs a Font from source bytes.
-func Parse(src []byte) (*Font, error) {
-	face, err := truetype.Parse(bytes.NewReader(src))
+// Parse constructs a Face from source bytes.
+func Parse(src []byte) (Face, error) {
+	ld, err := loader.NewLoader(bytes.NewReader(src))
 	if err != nil {
-		return nil, fmt.Errorf("failed parsing truetype font: %w", err)
+		return Face{}, err
 	}
-	return &Font{
-		font: face,
+	font, md, err := parseLoader(ld)
+	if err != nil {
+		return Face{}, fmt.Errorf("failed parsing truetype font: %w", err)
+	}
+	return Face{
+		face: font,
+		font: md,
 	}, nil
 }
 
-func (f *Font) Layout(ppem fixed.Int26_6, maxWidth int, lc system.Locale, txt io.RuneReader) ([]text.Line, error) {
-	return internal.Document(shaping.Shape, f.font, ppem, maxWidth, lc, txt), nil
-}
-
-func (f *Font) Shape(ppem fixed.Int26_6, str text.Layout) clip.PathSpec {
-	return textPath(ppem, f, str)
-}
-
-func (f *Font) Metrics(ppem fixed.Int26_6) font.Metrics {
-	metrics := font.Metrics{}
-	font := harfbuzz.NewFont(f.font)
-	font.XScale = int32(ppem.Ceil()) << 6
-	font.YScale = font.XScale
-	// Use any horizontal direction.
-	fontExtents := font.ExtentsForDirection(harfbuzz.LeftToRight)
-	ascender := fixed.I(int(fontExtents.Ascender * 64))
-	descender := fixed.I(int(fontExtents.Descender * 64))
-	gap := fixed.I(int(fontExtents.LineGap * 64))
-	metrics.Height = ascender + descender + gap
-	metrics.Ascent = ascender
-	metrics.Descent = descender
-	// These three are not readily available.
-	// TODO(whereswaldon): figure out how to get these values.
-	metrics.XHeight = ascender
-	metrics.CapHeight = ascender
-	metrics.CaretSlope = image.Pt(0, 1)
-
-	return metrics
-}
-
-func textPath(ppem fixed.Int26_6, font *Font, str text.Layout) clip.PathSpec {
-	var lastPos f32.Point
-	var builder clip.Path
-	ops := new(op.Ops)
-	var x fixed.Int26_6
-	builder.Begin(ops)
-	rune := 0
-	ppemInt := ppem.Round()
-	ppem16 := uint16(ppemInt)
-	scaleFactor := float32(ppemInt) / float32(font.font.Upem())
-	for _, g := range str.Glyphs {
-		advance := g.XAdvance
-		outline, ok := font.font.GlyphData(g.ID, ppem16, ppem16).(fonts.GlyphOutline)
-		if !ok {
-			continue
-		}
-		// Move to glyph position.
-		pos := f32.Point{
-			X: float32(x)/64 - float32(g.XOffset)/64,
-			Y: -float32(g.YOffset) / 64,
-		}
-		builder.Move(pos.Sub(lastPos))
-		lastPos = pos
-		var lastArg f32.Point
-
-		// Convert sfnt.Segments to relative segments.
-		for _, fseg := range outline.Segments {
-			nargs := 1
-			switch fseg.Op {
-			case fonts.SegmentOpQuadTo:
-				nargs = 2
-			case fonts.SegmentOpCubeTo:
-				nargs = 3
-			}
-			var args [3]f32.Point
-			for i := 0; i < nargs; i++ {
-				a := f32.Point{
-					X: fseg.Args[i].X * scaleFactor,
-					Y: -fseg.Args[i].Y * scaleFactor,
-				}
-				args[i] = a.Sub(lastArg)
-				if i == nargs-1 {
-					lastArg = a
-				}
-			}
-			switch fseg.Op {
-			case fonts.SegmentOpMoveTo:
-				builder.Move(args[0])
-			case fonts.SegmentOpLineTo:
-				builder.Line(args[0])
-			case fonts.SegmentOpQuadTo:
-				builder.Quad(args[0], args[1])
-			case fonts.SegmentOpCubeTo:
-				builder.Cube(args[0], args[1], args[2])
-			default:
-				panic("unsupported segment op")
-			}
-		}
-		lastPos = lastPos.Add(lastArg)
-		x += advance
-		rune++
+// ParseCollection parse an Opentype font file, with support for collections.
+// Single font files are supported, returning a slice with length 1.
+// The returned fonts are automatically wrapped in a text.FontFace with
+// inferred font metadata.
+// BUG(whereswaldon): the only Variant that can be detected automatically is
+// "Mono".
+func ParseCollection(src []byte) ([]giofont.FontFace, error) {
+	lds, err := loader.NewLoaders(bytes.NewReader(src))
+	if err != nil {
+		return nil, err
+	}
+	out := make([]giofont.FontFace, len(lds))
+	for i, ld := range lds {
+		face, md, err := parseLoader(ld)
+		if err != nil {
+			return nil, fmt.Errorf("reading font %d of collection: %s", i, err)
+		}
+		ff := Face{
+			face: face,
+			font: md,
+		}
+		out[i] = giofont.FontFace{
+			Face: ff,
+			Font: ff.Font(),
+		}
+	}
+
+	return out, nil
+}
+
+func DescriptionToFont(md metadata.Description) giofont.Font {
+	return giofont.Font{
+		Typeface: giofont.Typeface(md.Family),
+		Style:    gioStyle(md.Aspect.Style),
+		Weight:   gioWeight(md.Aspect.Weight),
+	}
+}
+
+func FontToDescription(font giofont.Font) metadata.Description {
+	return metadata.Description{
+		Family: string(font.Typeface),
+		Aspect: metadata.Aspect{
+			Style:  mdStyle(font.Style),
+			Weight: mdWeight(font.Weight),
+		},
+	}
+}
+
+// parseLoader parses the contents of the loader into a face and its metadata.
+func parseLoader(ld *loader.Loader) (font.Font, giofont.Font, error) {
+	ft, err := fontapi.NewFont(ld)
+	if err != nil {
+		return nil, giofont.Font{}, err
+	}
+	data := DescriptionToFont(metadata.Metadata(ld))
+	return ft, data, nil
+}
+
+// Face returns a thread-unsafe wrapper for this Face suitable for use by a single shaper.
+// Face many be invoked any number of times and is safe so long as each return value is
+// only used by one goroutine.
+func (f Face) Face() font.Face {
+	return &fontapi.Face{Font: f.face}
+}
+
+// FontFace returns a text.Font with populated font metadata for the
+// font.
+// BUG(whereswaldon): the only Variant that can be detected automatically is
+// "Mono".
+func (f Face) Font() giofont.Font {
+	return f.font
+}
+
+func gioStyle(s metadata.Style) giofont.Style {
+	switch s {
+	case metadata.StyleItalic:
+		return giofont.Italic
+	case metadata.StyleNormal:
+		fallthrough
+	default:
+		return giofont.Regular
+	}
+}
+
+func mdStyle(g giofont.Style) metadata.Style {
+	switch g {
+	case giofont.Italic:
+		return metadata.StyleItalic
+	case giofont.Regular:
+		fallthrough
+	default:
+		return metadata.StyleNormal
+	}
+}
+
+func gioWeight(w metadata.Weight) giofont.Weight {
+	switch w {
+	case metadata.WeightThin:
+		return giofont.Thin
+	case metadata.WeightExtraLight:
+		return giofont.ExtraLight
+	case metadata.WeightLight:
+		return giofont.Light
+	case metadata.WeightNormal:
+		return giofont.Normal
+	case metadata.WeightMedium:
+		return giofont.Medium
+	case metadata.WeightSemibold:
+		return giofont.SemiBold
+	case metadata.WeightBold:
+		return giofont.Bold
+	case metadata.WeightExtraBold:
+		return giofont.ExtraBold
+	case metadata.WeightBlack:
+		return giofont.Black
+	default:
+		return giofont.Normal
+	}
+}
+
+func mdWeight(g giofont.Weight) metadata.Weight {
+	switch g {
+	case giofont.Thin:
+		return metadata.WeightThin
+	case giofont.ExtraLight:
+		return metadata.WeightExtraLight
+	case giofont.Light:
+		return metadata.WeightLight
+	case giofont.Normal:
+		return metadata.WeightNormal
+	case giofont.Medium:
+		return metadata.WeightMedium
+	case giofont.SemiBold:
+		return metadata.WeightSemibold
+	case giofont.Bold:
+		return metadata.WeightBold
+	case giofont.ExtraBold:
+		return metadata.WeightExtraBold
+	case giofont.Black:
+		return metadata.WeightBlack
+	default:
+		return metadata.WeightNormal
 	}
-	return builder.End()
 }

font/opentype/opentype_test.go

@@ -1,151 +0,0 @@
-package opentype
-
-import (
-	"bytes"
-	"compress/gzip"
-	"encoding/binary"
-	"fmt"
-	"io/ioutil"
-	"os"
-	"strings"
-	"testing"
-
-	"golang.org/x/image/font/gofont/goregular"
-	"golang.org/x/image/math/fixed"
-
-	"gioui.org/internal/ops"
-	"gioui.org/io/system"
-	"gioui.org/op"
-	"gioui.org/op/clip"
-	"gioui.org/text"
-)
-
-var english = system.Locale{
-	Language:  "EN",
-	Direction: system.LTR,
-}
-
-func TestEmptyString(t *testing.T) {
-	face, err := Parse(goregular.TTF)
-	if err != nil {
-		t.Fatal(err)
-	}
-
-	ppem := fixed.I(200)
-
-	lines, err := face.Layout(ppem, 2000, english, strings.NewReader(""))
-	if err != nil {
-		t.Fatal(err)
-	}
-	if len(lines) == 0 {
-		t.Fatalf("Layout returned no lines for empty string; expected 1")
-	}
-	l := lines[0]
-	exp := fixed.Rectangle26_6{
-		Min: fixed.Point26_6{
-			Y: fixed.Int26_6(-12094),
-		},
-		Max: fixed.Point26_6{
-			Y: fixed.Int26_6(2700),
-		},
-	}
-	if got := l.Bounds; got != exp {
-		t.Errorf("got bounds %+v for empty string; expected %+v", got, exp)
-	}
-}
-
-func decompressFontFile(name string) (*Font, []byte, error) {
-	f, err := os.Open(name)
-	if err != nil {
-		return nil, nil, fmt.Errorf("could not open file for reading: %s: %v", name, err)
-	}
-	defer f.Close()
-	gz, err := gzip.NewReader(f)
-	if err != nil {
-		return nil, nil, fmt.Errorf("font file contains invalid gzip data: %v", err)
-	}
-	src, err := ioutil.ReadAll(gz)
-	if err != nil {
-		return nil, nil, fmt.Errorf("failed to decompress font file: %v", err)
-	}
-	fnt, err := Parse(src)
-	if err != nil {
-		return nil, nil, fmt.Errorf("file did not contain a valid font: %v", err)
-	}
-	return fnt, src, nil
-}
-
-// mergeFonts produces a trivial OpenType Collection (OTC) file for two source fonts.
-// It makes many assumptions and is not meant for general use.
-// For file format details, see https://docs.microsoft.com/en-us/typography/opentype/spec/otff
-// For a robust tool to generate these files, see https://pypi.org/project/afdko/
-func mergeFonts(ttf1, ttf2 []byte) []byte {
-	// Locations to place the two embedded fonts. All of the offsets to the fonts' internal tables will need to be
-	// shifted from the start of the file by the appropriate amount, and then everything will work as expected.
-	offset1 := uint32(20) // Length of OpenType collection headers
-	offset2 := offset1 + uint32(len(ttf1))
-
-	var buf bytes.Buffer
-	_, _ = buf.Write([]byte("ttcf\x00\x01\x00\x00\x00\x00\x00\x02"))
-	_ = binary.Write(&buf, binary.BigEndian, offset1)
-	_ = binary.Write(&buf, binary.BigEndian, offset2)
-
-	// Inline function to copy a font into the collection verbatim, except for adding an offset to all of the font's
-	// table positions.
-	copyOffsetTTF := func(ttf []byte, offset uint32) {
-		_, _ = buf.Write(ttf[:12])
-		numTables := binary.BigEndian.Uint16(ttf[4:6])
-		for i := uint16(0); i < numTables; i++ {
-			p := 12 + 16*i
-			_, _ = buf.Write(ttf[p : p+8])
-			tblLoc := binary.BigEndian.Uint32(ttf[p+8:p+12]) + offset
-			_ = binary.Write(&buf, binary.BigEndian, tblLoc)
-			_, _ = buf.Write(ttf[p+12 : p+16])
-		}
-		_, _ = buf.Write(ttf[12+16*numTables:])
-	}
-	copyOffsetTTF(ttf1, offset1)
-	copyOffsetTTF(ttf2, offset2)
-
-	return buf.Bytes()
-}
-
-// shapeRune uses a given Face to shape exactly one rune at a fixed size, then returns the resulting shape data.
-func shapeRune(f text.Face, r rune) (clip.PathSpec, error) {
-	ppem := fixed.I(200)
-	lines, err := f.Layout(ppem, 2000, english, strings.NewReader(string(r)))
-	if err != nil {
-		return clip.PathSpec{}, err
-	}
-	if len(lines) != 1 {
-		return clip.PathSpec{}, fmt.Errorf("unexpected rendering for \"U+%08X\": got %d lines (expected: 1)", r, len(lines))
-	}
-	return f.Shape(ppem, lines[0].Layout), nil
-}
-
-// areShapesEqual returns true iff both given text shapes are produced with identical operations.
-func areShapesEqual(shape1, shape2 clip.PathSpec) bool {
-	var ops1, ops2 op.Ops
-	clip.Outline{Path: shape1}.Op().Push(&ops1).Pop()
-	clip.Outline{Path: shape2}.Op().Push(&ops2).Pop()
-	var r1, r2 ops.Reader
-	r1.Reset(&ops1.Internal)
-	r2.Reset(&ops2.Internal)
-	for {
-		encOp1, ok1 := r1.Decode()
-		encOp2, ok2 := r2.Decode()
-		if ok1 != ok2 {
-			return false
-		}
-		if !ok1 {
-			break
-		}
-		if len(encOp1.Refs) > 0 || len(encOp2.Refs) > 0 {
-			panic("unexpected ops with refs in font shaping test")
-		}
-		if !bytes.Equal(encOp1.Data, encOp2.Data) {
-			return false
-		}
-	}
-	return true
-}

gesture/gesture.go

@@ -18,6 +18,7 @@ import (
 	"gioui.org/f32"
 	"gioui.org/internal/fling"
 	"gioui.org/io/event"
+	"gioui.org/io/input"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
 	"gioui.org/op"
@@ -37,20 +38,24 @@ type Hover struct {
 
 // Add the gesture to detect hovering over the current pointer area.
 func (h *Hover) Add(ops *op.Ops) {
-	pointer.InputOp{
-		Tag:   h,
-		Types: pointer.Enter | pointer.Leave,
-	}.Add(ops)
+	event.Op(ops, h)
 }
 
-// Hovered returns whether a pointer is inside the area.
-func (h *Hover) Hovered(q event.Queue) bool {
-	for _, ev := range q.Events(h) {
+// Update state and report whether a pointer is inside the area.
+func (h *Hover) Update(q input.Source) bool {
+	for {
+		ev, ok := q.Event(pointer.Filter{
+			Target: h,
+			Kinds:  pointer.Enter | pointer.Leave | pointer.Cancel,
+		})
+		if !ok {
+			break
+		}
 		e, ok := ev.(pointer.Event)
 		if !ok {
 			continue
 		}
-		switch e.Type {
+		switch e.Kind {
 		case pointer.Leave, pointer.Cancel:
 			if h.entered && h.pid == e.PointerID {
 				h.entered = false
@@ -87,11 +92,11 @@ type Click struct {
 }
 
 // ClickEvent represent a click action, either a
-// TypePress for the beginning of a click or a
-// TypeClick for a completed click.
+// KindPress for the beginning of a click or a
+// KindClick for a completed click.
 type ClickEvent struct {
-	Type      ClickType
-	Position  f32.Point
+	Kind      ClickKind
+	Position  image.Point
 	Source    pointer.Source
 	Modifiers key.Modifiers
 	// NumClicks records successive clicks occurring
@@ -99,7 +104,7 @@ type ClickEvent struct {
 	NumClicks int
 }
 
-type ClickType uint8
+type ClickKind uint8
 
 // Drag detects drag gestures in the form of pointer.Drag events.
 type Drag struct {
@@ -107,7 +112,6 @@ type Drag struct {
 	pressed  bool
 	pid      pointer.ID
 	start    f32.Point
-	grab     bool
 }
 
 // Scroll detects scroll gestures and reduces them to
@@ -115,11 +119,9 @@ type Drag struct {
 // movements as well as drag and fling touch gestures.
 type Scroll struct {
 	dragging  bool
-	axis      Axis
 	estimator fling.Extrapolation
 	flinger   fling.Animation
 	pid       pointer.ID
-	grab      bool
 	last      int
 	// Leftover scroll.
 	scroll float32
@@ -136,15 +138,15 @@ const (
 )
 
 const (
-	// TypePress is reported for the first pointer
+	// KindPress is reported for the first pointer
 	// press.
-	TypePress ClickType = iota
-	// TypeClick is reported when a click action
+	KindPress ClickKind = iota
+	// KindClick is reported when a click action
 	// is complete.
-	TypeClick
-	// TypeCancel is reported when the gesture is
+	KindClick
+	// KindCancel is reported when the gesture is
 	// cancelled.
-	TypeCancel
+	KindCancel
 )
 
 const (
@@ -157,14 +159,11 @@ const (
 	StateFlinging
 )
 
-var touchSlop = unit.Dp(3)
+const touchSlop = unit.Dp(3)
 
 // Add the handler to the operation list to receive click events.
 func (c *Click) Add(ops *op.Ops) {
-	pointer.InputOp{
-		Tag:   c,
-		Types: pointer.Press | pointer.Release | pointer.Enter | pointer.Leave,
-	}.Add(ops)
+	event.Op(ops, c)
 }
 
 // Hovered returns whether a pointer is inside the area.
@@ -177,30 +176,36 @@ func (c *Click) Pressed() bool {
 	return c.pressed
 }
 
-// Events returns the next click events, if any.
-func (c *Click) Events(q event.Queue) []ClickEvent {
-	var events []ClickEvent
-	for _, evt := range q.Events(c) {
+// Update state and return the next click events, if any.
+func (c *Click) Update(q input.Source) (ClickEvent, bool) {
+	for {
+		evt, ok := q.Event(pointer.Filter{
+			Target: c,
+			Kinds:  pointer.Press | pointer.Release | pointer.Enter | pointer.Leave | pointer.Cancel,
+		})
+		if !ok {
+			break
+		}
 		e, ok := evt.(pointer.Event)
 		if !ok {
 			continue
 		}
-		switch e.Type {
+		switch e.Kind {
 		case pointer.Release:
 			if !c.pressed || c.pid != e.PointerID {
 				break
 			}
 			c.pressed = false
 			if !c.entered || c.hovered {
-				if e.Time-c.clickedAt < doubleClickDuration {
-					c.clicks++
-				} else {
-					c.clicks = 1
-				}
-				c.clickedAt = e.Time
-				events = append(events, ClickEvent{Type: TypeClick, Position: e.Position, Source: e.Source, Modifiers: e.Modifiers, NumClicks: c.clicks})
+				return ClickEvent{
+					Kind:      KindClick,
+					Position:  e.Position.Round(),
+					Source:    e.Source,
+					Modifiers: e.Modifiers,
+					NumClicks: c.clicks,
+				}, true
 			} else {
-				events = append(events, ClickEvent{Type: TypeCancel})
+				return ClickEvent{Kind: KindCancel}, true
 			}
 		case pointer.Cancel:
 			wasPressed := c.pressed
@@ -208,7 +213,7 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 			c.hovered = false
 			c.entered = false
 			if wasPressed {
-				events = append(events, ClickEvent{Type: TypeCancel})
+				return ClickEvent{Kind: KindCancel}, true
 			}
 		case pointer.Press:
 			if c.pressed {
@@ -224,7 +229,13 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 				break
 			}
 			c.pressed = true
-			events = append(events, ClickEvent{Type: TypePress, Position: e.Position, Source: e.Source, Modifiers: e.Modifiers})
+			if e.Time-c.clickedAt < doubleClickDuration {
+				c.clicks++
+			} else {
+				c.clicks = 1
+			}
+			c.clickedAt = e.Time
+			return ClickEvent{Kind: KindPress, Position: e.Position.Round(), Source: e.Source, Modifiers: e.Modifiers, NumClicks: c.clicks}, true
 		case pointer.Leave:
 			if !c.pressed {
 				c.pid = e.PointerID
@@ -242,25 +253,16 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 			}
 		}
 	}
-	return events
+	return ClickEvent{}, false
 }
 
 func (ClickEvent) ImplementsEvent() {}
 
 // Add the handler to the operation list to receive scroll events.
 // The bounds variable refers to the scrolling boundaries
-// as defined in io/pointer.InputOp.
-func (s *Scroll) Add(ops *op.Ops, bounds image.Rectangle) {
-	oph := pointer.InputOp{
-		Tag:          s,
-		Grab:         s.grab,
-		Types:        pointer.Press | pointer.Drag | pointer.Release | pointer.Scroll,
-		ScrollBounds: bounds,
-	}
-	oph.Add(ops)
-	if s.flinger.Active() {
-		op.InvalidateOp{}.Add(ops)
-	}
+// as defined in [pointer.Filter].
+func (s *Scroll) Add(ops *op.Ops) {
+	event.Op(ops, s)
 }
 
 // Stop any remaining fling movement.
@@ -268,20 +270,25 @@ func (s *Scroll) Stop() {
 	s.flinger = fling.Animation{}
 }
 
-// Scroll detects the scrolling distance from the available events and
-// ongoing fling gestures.
-func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis) int {
-	if s.axis != axis {
-		s.axis = axis
-		return 0
-	}
+// Update state and report the scroll distance along axis.
+func (s *Scroll) Update(cfg unit.Metric, q input.Source, t time.Time, axis Axis, scrollx, scrolly pointer.ScrollRange) int {
 	total := 0
-	for _, evt := range q.Events(s) {
+	f := pointer.Filter{
+		Target:  s,
+		Kinds:   pointer.Press | pointer.Drag | pointer.Release | pointer.Scroll | pointer.Cancel,
+		ScrollX: scrollx,
+		ScrollY: scrolly,
+	}
+	for {
+		evt, ok := q.Event(f)
+		if !ok {
+			break
+		}
 		e, ok := evt.(pointer.Event)
 		if !ok {
 			continue
 		}
-		switch e.Type {
+		switch e.Kind {
 		case pointer.Press:
 			if s.dragging {
 				break
@@ -293,7 +300,7 @@ func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis)
 			}
 			s.Stop()
 			s.estimator = fling.Extrapolation{}
-			v := s.val(e.Position)
+			v := s.val(axis, e.Position)
 			s.last = int(math.Round(float64(v)))
 			s.estimator.Sample(e.Time, v)
 			s.dragging = true
@@ -303,15 +310,14 @@ func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis)
 				break
 			}
 			fling := s.estimator.Estimate()
-			if slop, d := float32(cfg.Px(touchSlop)), fling.Distance; d < -slop || d > slop {
+			if slop, d := float32(cfg.Dp(touchSlop)), fling.Distance; d < -slop || d > slop {
 				s.flinger.Start(cfg, t, fling.Velocity)
 			}
 			fallthrough
 		case pointer.Cancel:
 			s.dragging = false
-			s.grab = false
 		case pointer.Scroll:
-			switch s.axis {
+			switch axis {
 			case Horizontal:
 				s.scroll += e.Scroll.X
 			case Vertical:
@@ -324,14 +330,14 @@ func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis)
 			if !s.dragging || s.pid != e.PointerID {
 				continue
 			}
-			val := s.val(e.Position)
+			val := s.val(axis, e.Position)
 			s.estimator.Sample(e.Time, val)
 			v := int(math.Round(float64(val)))
 			dist := s.last - v
 			if e.Priority < pointer.Grabbed {
-				slop := cfg.Px(touchSlop)
+				slop := cfg.Dp(touchSlop)
 				if dist := dist; dist >= slop || -slop >= dist {
-					s.grab = true
+					q.Execute(pointer.GrabCmd{Tag: s, ID: e.PointerID})
 				}
 			} else {
 				s.last = v
@@ -340,11 +346,14 @@ func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis)
 		}
 	}
 	total += s.flinger.Tick(t)
+	if s.flinger.Active() {
+		q.Execute(op.InvalidateCmd{})
+	}
 	return total
 }
 
-func (s *Scroll) val(p f32.Point) float32 {
-	if s.axis == Horizontal {
+func (s *Scroll) val(axis Axis, p f32.Point) float32 {
+	if axis == Horizontal {
 		return p.X
 	} else {
 		return p.Y
@@ -365,23 +374,25 @@ func (s *Scroll) State() ScrollState {
 
 // Add the handler to the operation list to receive drag events.
 func (d *Drag) Add(ops *op.Ops) {
-	pointer.InputOp{
-		Tag:   d,
-		Grab:  d.grab,
-		Types: pointer.Press | pointer.Drag | pointer.Release,
-	}.Add(ops)
+	event.Op(ops, d)
 }
 
-// Events returns the next drag events, if any.
-func (d *Drag) Events(cfg unit.Metric, q event.Queue, axis Axis) []pointer.Event {
-	var events []pointer.Event
-	for _, e := range q.Events(d) {
-		e, ok := e.(pointer.Event)
+// Update state and return the next drag event, if any.
+func (d *Drag) Update(cfg unit.Metric, q input.Source, axis Axis) (pointer.Event, bool) {
+	for {
+		ev, ok := q.Event(pointer.Filter{
+			Target: d,
+			Kinds:  pointer.Press | pointer.Drag | pointer.Release | pointer.Cancel,
+		})
+		if !ok {
+			break
+		}
+		e, ok := ev.(pointer.Event)
 		if !ok {
 			continue
 		}
 
-		switch e.Type {
+		switch e.Kind {
 		case pointer.Press:
 			if !(e.Buttons == pointer.ButtonPrimary || e.Source == pointer.Touch) {
 				continue
@@ -407,9 +418,9 @@ func (d *Drag) Events(cfg unit.Metric, q event.Queue, axis Axis) []pointer.Event
 			}
 			if e.Priority < pointer.Grabbed {
 				diff := e.Position.Sub(d.start)
-				slop := cfg.Px(touchSlop)
+				slop := cfg.Dp(touchSlop)
 				if diff.X*diff.X+diff.Y*diff.Y > float32(slop*slop) {
-					d.grab = true
+					q.Execute(pointer.GrabCmd{Tag: d, ID: e.PointerID})
 				}
 			}
 		case pointer.Release, pointer.Cancel:
@@ -418,13 +429,12 @@ func (d *Drag) Events(cfg unit.Metric, q event.Queue, axis Axis) []pointer.Event
 				continue
 			}
 			d.dragging = false
-			d.grab = false
 		}
 
-		events = append(events, e)
+		return e, true
 	}
 
-	return events
+	return pointer.Event{}, false
 }
 
 // Dragging reports whether it is currently in use.
@@ -444,16 +454,16 @@ func (a Axis) String() string {
 	}
 }
 
-func (ct ClickType) String() string {
+func (ct ClickKind) String() string {
 	switch ct {
-	case TypePress:
-		return "TypePress"
-	case TypeClick:
-		return "TypeClick"
-	case TypeCancel:
-		return "TypeCancel"
+	case KindPress:
+		return "KindPress"
+	case KindClick:
+		return "KindClick"
+	case KindCancel:
+		return "KindCancel"
 	default:
-		panic("invalid ClickType")
+		panic("invalid ClickKind")
 	}
 }
 

gesture/gesture_test.go

@@ -9,8 +9,8 @@ import (
 
 	"gioui.org/f32"
 	"gioui.org/io/event"
+	"gioui.org/io/input"
 	"gioui.org/io/pointer"
-	"gioui.org/io/router"
 	"gioui.org/op"
 	"gioui.org/op/clip"
 )
@@ -22,20 +22,21 @@ func TestHover(t *testing.T) {
 	stack := clip.Rect(rect).Push(ops)
 	h.Add(ops)
 	stack.Pop()
-	r := new(router.Router)
+	r := new(input.Router)
+	h.Update(r.Source())
 	r.Frame(ops)
 
 	r.Queue(
-		pointer.Event{Type: pointer.Move, Position: f32.Pt(30, 30)},
+		pointer.Event{Kind: pointer.Move, Position: f32.Pt(30, 30)},
 	)
-	if !h.Hovered(r) {
+	if !h.Update(r.Source()) {
 		t.Fatal("expected hovered")
 	}
 
 	r.Queue(
-		pointer.Event{Type: pointer.Move, Position: f32.Pt(50, 50)},
+		pointer.Event{Kind: pointer.Move, Position: f32.Pt(50, 50)},
 	)
-	if h.Hovered(r) {
+	if h.Update(r.Source()) {
 		t.Fatal("expected not hovered")
 	}
 }
@@ -71,12 +72,21 @@ func TestMouseClicks(t *testing.T) {
 			var ops op.Ops
 			click.Add(&ops)
 
-			var r router.Router
+			var r input.Router
+			click.Update(r.Source())
 			r.Frame(&ops)
 			r.Queue(tc.events...)
 
-			events := click.Events(&r)
-			clicks := filterMouseClicks(events)
+			var clicks []ClickEvent
+			for {
+				ev, ok := click.Update(r.Source())
+				if !ok {
+					break
+				}
+				if ev.Kind == KindClick {
+					clicks = append(clicks, ev)
+				}
+			}
 			if got, want := len(clicks), len(tc.clicks); got != want {
 				t.Fatalf("got %d mouse clicks, expected %d", got, want)
 			}
@@ -92,26 +102,17 @@ func TestMouseClicks(t *testing.T) {
 
 func mouseClickEvents(times ...time.Duration) []event.Event {
 	press := pointer.Event{
-		Type:    pointer.Press,
+		Kind:    pointer.Press,
 		Source:  pointer.Mouse,
 		Buttons: pointer.ButtonPrimary,
 	}
 	events := make([]event.Event, 0, 2*len(times))
 	for _, t := range times {
+		press := press
+		press.Time = t
 		release := press
-		release.Type = pointer.Release
-		release.Time = t
+		release.Kind = pointer.Release
 		events = append(events, press, release)
 	}
 	return events
 }
-
-func filterMouseClicks(events []ClickEvent) []ClickEvent {
-	var clicks []ClickEvent
-	for _, ev := range events {
-		if ev.Type == TypeClick {
-			clicks = append(clicks, ev)
-		}
-	}
-	return clicks
-}

go.mod

@@ -1,20 +1,16 @@
 module gioui.org
 
-go 1.17
+go 1.21
 
 require (
-	golang.org/x/exp v0.0.0-20210722180016-6781d3edade3
-	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
-	golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c
-)
-
-require (
-	eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3
+	eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d
 	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2
-	gioui.org/shader v1.0.6
-	github.com/benoitkugler/textlayout v0.0.10
-	github.com/gioui/uax v0.2.1-0.20220325163150-e3d987515a12
-	github.com/go-text/typesetting v0.0.0-20220112121102-58fe93c84506
+	gioui.org/shader v1.0.8
+	github.com/go-text/typesetting v0.1.1
+	golang.org/x/exp v0.0.0-20221012211006-4de253d81b95
+	golang.org/x/exp/shiny v0.0.0-20220827204233-334a2380cb91
+	golang.org/x/image v0.5.0
+	golang.org/x/sys v0.5.0
 )
 
-require golang.org/x/text v0.3.6 // indirect
+require golang.org/x/text v0.9.0

go.sum

@@ -1,453 +1,45 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-dmitri.shuralyov.com/gpu/mtl v0.0.0-20201218220906-28db891af037/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
-eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3 h1:djFprmHZgrSepsHAIRMp5UJn3PzsoTg9drI+BDmif5Q=
-eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3/go.mod h1:OYVuxibdk9OSLX8vAqydtRPP87PyTFcT9uH3MlEGBQA=
+eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d h1:ARo7NCVvN2NdhLlJE9xAbKweuI9L6UgfTbYb0YwPacY=
+eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d/go.mod h1:OYVuxibdk9OSLX8vAqydtRPP87PyTFcT9uH3MlEGBQA=
 gioui.org/cpu v0.0.0-20210808092351-bfe733dd3334/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2 h1:AGDDxsJE1RpcXTAxPG2B4jrwVUJGFDjINIPi1jtO6pc=
 gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2/go.mod h1:A8M0Cn5o+vY5LTMlnRoK3O5kG+rH0kWfJjeKd9QpBmQ=
-gioui.org/shader v1.0.6 h1:cvZmU+eODFR2545X+/8XucgZdTtEjR3QWW6W65b0q5Y=
-gioui.org/shader v1.0.6/go.mod h1:mWdiME581d/kV7/iEhLmUgUK5iZ09XR5XpduXzbePVM=
-github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/Knetic/govaluate v3.0.1-0.20171022003610-9aa49832a739+incompatible/go.mod h1:r7JcOSlj0wfOMncg0iLm8Leh48TZaKVeNIfJntJ2wa0=
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-github.com/aws/aws-lambda-go v1.13.3/go.mod h1:4UKl9IzQMoD+QF79YdCuzCwp8VbmG4VAQwij/eHl5CU=
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-honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.1.3/go.mod h1:NgwopIslSNH47DimFoV78dnkksY2EFtX0ajyb3K/las=
-sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
-sourcegraph.com/sourcegraph/appdash v0.0.0-20190731080439-ebfcffb1b5c0/go.mod h1:hI742Nqp5OhwiqlzhgfbWU4mW4yO10fP+LoT9WOswdU=

gpu/caches.go

@@ -5,12 +5,21 @@ package gpu
 import (
 	"fmt"
 
-	"gioui.org/f32"
+	"gioui.org/internal/f32"
 )
 
-type resourceCache struct {
-	res    map[interface{}]resource
-	newRes map[interface{}]resource
+type textureCacheKey struct {
+	filter byte
+	handle any
+}
+
+type textureCache struct {
+	res map[textureCacheKey]resourceCacheValue
+}
+
+type resourceCacheValue struct {
+	used     bool
+	resource resource
 }
 
 // opCache is like a resourceCache but using concrete types and a
@@ -33,48 +42,50 @@ type opCacheValue struct {
 	keep bool
 }
 
-func newResourceCache() *resourceCache {
-	return &resourceCache{
-		res:    make(map[interface{}]resource),
-		newRes: make(map[interface{}]resource),
+func newTextureCache() *textureCache {
+	return &textureCache{
+		res: make(map[textureCacheKey]resourceCacheValue),
 	}
 }
 
-func (r *resourceCache) get(key interface{}) (resource, bool) {
+func (r *textureCache) get(key textureCacheKey) (resource, bool) {
 	v, exists := r.res[key]
-	if exists {
-		r.newRes[key] = v
+	if !exists {
+		return nil, false
 	}
-	return v, exists
+	if !v.used {
+		v.used = true
+		r.res[key] = v
+	}
+	return v.resource, exists
 }
 
-func (r *resourceCache) put(key interface{}, val resource) {
-	if _, exists := r.newRes[key]; exists {
-		panic(fmt.Errorf("key exists, %p", key))
+func (r *textureCache) put(key textureCacheKey, val resource) {
+	v, exists := r.res[key]
+	if exists && v.used {
+		panic(fmt.Errorf("key exists, %v", key))
 	}
-	r.res[key] = val
-	r.newRes[key] = val
+	v.used = true
+	v.resource = val
+	r.res[key] = v
 }
 
-func (r *resourceCache) frame() {
+func (r *textureCache) frame() {
 	for k, v := range r.res {
-		if _, exists := r.newRes[k]; !exists {
+		if v.used {
+			v.used = false
+			r.res[k] = v
+		} else {
 			delete(r.res, k)
-			v.release()
+			v.resource.release()
 		}
 	}
-	for k, v := range r.newRes {
-		delete(r.newRes, k)
-		r.res[k] = v
-	}
 }
 
-func (r *resourceCache) release() {
-	r.frame()
+func (r *textureCache) release() {
 	for _, v := range r.res {
-		v.release()
+		v.resource.release()
 	}
-	r.newRes = nil
 	r.res = nil
 }
 

gpu/clip.go

@@ -1,7 +1,10 @@
 package gpu
 
 import (
-	"gioui.org/f32"
+	"encoding/binary"
+	"math"
+
+	"gioui.org/internal/f32"
 	"gioui.org/internal/stroke"
 )
 
@@ -9,19 +12,48 @@ type quadSplitter struct {
 	bounds  f32.Rectangle
 	contour uint32
 	d       *drawOps
+
+	// scratch space used by calls to stroke.SplitCubic
+	scratch []stroke.QuadSegment
 }
 
 func encodeQuadTo(data []byte, meta uint32, from, ctrl, to f32.Point) {
-	// NW.
-	encodeVertex(data, meta, -1, 1, from, ctrl, to)
-	// NE.
-	encodeVertex(data[vertStride:], meta, 1, 1, from, ctrl, to)
-	// SW.
-	encodeVertex(data[vertStride*2:], meta, -1, -1, from, ctrl, to)
-	// SE.
-	encodeVertex(data[vertStride*3:], meta, 1, -1, from, ctrl, to)
+	// inlined code:
+	//   encodeVertex(data, meta, -1, 1, from, ctrl, to)
+	//   encodeVertex(data[vertStride:], meta, 1, 1, from, ctrl, to)
+	//   encodeVertex(data[vertStride*2:], meta, -1, -1, from, ctrl, to)
+	//   encodeVertex(data[vertStride*3:], meta, 1, -1, from, ctrl, to)
+	// this code needs to stay in sync with `vertex.encode`.
+
+	bo := binary.LittleEndian
+	data = data[:vertStride*4]
+
+	// encode the main template
+	bo.PutUint32(data[4:8], meta)
+	bo.PutUint32(data[8:12], math.Float32bits(from.X))
+	bo.PutUint32(data[12:16], math.Float32bits(from.Y))
+	bo.PutUint32(data[16:20], math.Float32bits(ctrl.X))
+	bo.PutUint32(data[20:24], math.Float32bits(ctrl.Y))
+	bo.PutUint32(data[24:28], math.Float32bits(to.X))
+	bo.PutUint32(data[28:32], math.Float32bits(to.Y))
+
+	copy(data[vertStride*1:vertStride*2], data[vertStride*0:vertStride*1])
+	copy(data[vertStride*2:vertStride*3], data[vertStride*0:vertStride*1])
+	copy(data[vertStride*3:vertStride*4], data[vertStride*0:vertStride*1])
+
+	bo.PutUint32(data[vertStride*0:vertStride*0+4], math.Float32bits(nwCorner))
+	bo.PutUint32(data[vertStride*1:vertStride*1+4], math.Float32bits(neCorner))
+	bo.PutUint32(data[vertStride*2:vertStride*2+4], math.Float32bits(swCorner))
+	bo.PutUint32(data[vertStride*3:vertStride*3+4], math.Float32bits(seCorner))
 }
 
+const (
+	nwCorner = 1*0.25 + 0*0.5
+	neCorner = 1*0.25 + 1*0.5
+	swCorner = 0*0.25 + 0*0.5
+	seCorner = 0*0.25 + 1*0.5
+)
+
 func encodeVertex(data []byte, meta uint32, cornerx, cornery int16, from, ctrl, to f32.Point) {
 	var corner float32
 	if cornerx == 1 {

gpu/clip_test.go

@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+package gpu
+
+import (
+	"testing"
+
+	"gioui.org/internal/f32"
+)
+
+func BenchmarkEncodeQuadTo(b *testing.B) {
+	var data [vertStride * 4]byte
+	for i := 0; i < b.N; i++ {
+		v := float32(i)
+		encodeQuadTo(data[:], 123,
+			f32.Point{X: v, Y: v},
+			f32.Point{X: v, Y: v},
+			f32.Point{X: v, Y: v},
+		)
+	}
+}

gpu/compute.go

@@ -12,18 +12,18 @@ import (
 	"image/color"
 	"image/draw"
 	"image/png"
-	"io/ioutil"
 	"math"
 	"math/bits"
+	"os"
 	"runtime"
 	"sort"
 	"time"
 	"unsafe"
 
 	"gioui.org/cpu"
-	"gioui.org/f32"
 	"gioui.org/gpu/internal/driver"
 	"gioui.org/internal/byteslice"
+	"gioui.org/internal/f32"
 	"gioui.org/internal/f32color"
 	"gioui.org/internal/ops"
 	"gioui.org/internal/scene"
@@ -93,7 +93,6 @@ type compute struct {
 		}
 	}
 	timers struct {
-		profile string
 		t       *timers
 		compact *timer
 		render  *timer
@@ -176,7 +175,6 @@ type materialUniforms struct {
 
 type collector struct {
 	hasher     maphash.Hash
-	profile    bool
 	reader     ops.Reader
 	states     []f32.Affine2D
 	clear      bool
@@ -265,7 +263,6 @@ type clipState struct {
 	path      []byte
 	pathKey   ops.Key
 	intersect f32.Rectangle
-	push      bool
 
 	clipKey
 }
@@ -308,11 +305,6 @@ type encoder struct {
 	ntrans   int
 }
 
-type encodeState struct {
-	trans f32.Affine2D
-	clip  f32.Rectangle
-}
-
 // sizedBuffer holds a GPU buffer, or its equivalent CPU memory.
 type sizedBuffer struct {
 	size   int
@@ -410,12 +402,6 @@ func newCompute(ctx driver.Device) (*compute, error) {
 		conf:          new(config),
 		memHeader:     new(memoryHeader),
 	}
-	null, err := ctx.NewTexture(driver.TextureFormatRGBA8, 1, 1, driver.FilterNearest, driver.FilterNearest, driver.BufferBindingShaderStorageRead)
-	if err != nil {
-		g.Release()
-		return nil, err
-	}
-	g.output.nullMaterials = null
 	shaders := []struct {
 		prog *computeProgram
 		src  shader.Sources
@@ -437,6 +423,13 @@ func newCompute(ctx driver.Device) (*compute, error) {
 	}
 	if g.useCPU {
 		g.dispatcher = newDispatcher(runtime.NumCPU())
+	} else {
+		null, err := ctx.NewTexture(driver.TextureFormatRGBA8, 1, 1, driver.FilterNearest, driver.FilterNearest, driver.BufferBindingShaderStorageRead)
+		if err != nil {
+			g.Release()
+			return nil, err
+		}
+		g.output.nullMaterials = null
 	}
 
 	copyVert, copyFrag, err := newShaders(ctx, gio.Shader_copy_vert, gio.Shader_copy_frag)
@@ -602,7 +595,7 @@ func (g *compute) frame(target RenderTarget) error {
 	defer g.ctx.EndFrame()
 
 	t := &g.timers
-	if g.collector.profile && t.t == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
+	if false && t.t == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
 		t.t = newTimers(g.ctx)
 		t.compact = t.t.newTimer()
 		t.render = t.t.newTimer()
@@ -636,13 +629,13 @@ func (g *compute) frame(target RenderTarget) error {
 		return err
 	}
 	t.compact.end()
-	if g.collector.profile && t.t.ready() {
+	if false && t.t.ready() {
 		com, ren, blit := t.compact.Elapsed, t.render.Elapsed, t.blit.Elapsed
 		ft := com + ren + blit
 		q := 100 * time.Microsecond
 		ft = ft.Round(q)
 		com, ren, blit = com.Round(q), ren.Round(q), blit.Round(q)
-		t.profile = fmt.Sprintf("ft:%7s com: %7s ren:%7s blit:%7s", ft, com, ren, blit)
+		// t.profile = fmt.Sprintf("ft:%7s com: %7s ren:%7s blit:%7s", ft, com, ren, blit)
 	}
 	return nil
 }
@@ -660,16 +653,12 @@ func (g *compute) dumpAtlases() {
 		if err := png.Encode(&buf, nrgba); err != nil {
 			panic(err)
 		}
-		if err := ioutil.WriteFile(fmt.Sprintf("dump-%d.png", i), buf.Bytes(), 0600); err != nil {
+		if err := os.WriteFile(fmt.Sprintf("dump-%d.png", i), buf.Bytes(), 0600); err != nil {
 			panic(err)
 		}
 	}
 }
 
-func (g *compute) Profile() string {
-	return g.timers.profile
-}
-
 func (g *compute) compactAllocs() error {
 	const (
 		maxAllocAge = 3
@@ -855,7 +844,7 @@ func (g *compute) blitLayers(d driver.LoadDesc, fbo driver.Texture, viewport ima
 	for _, l := range layers {
 		placef := layout.FPt(l.alloc.rect.Min)
 		sizef := layout.FPt(l.rect.Size())
-		r := layout.FRect(l.rect)
+		r := f32.FRect(l.rect)
 		quad := [4]layerVertex{
 			{posX: float32(r.Min.X), posY: float32(r.Min.Y), u: placef.X, v: placef.Y},
 			{posX: float32(r.Max.X), posY: float32(r.Min.Y), u: placef.X + sizef.X, v: placef.Y},
@@ -1612,13 +1601,6 @@ func (e *encoder) numElements() int {
 	return len(e.scene)
 }
 
-func (e *encoder) append(e2 encoder) {
-	e.scene = append(e.scene, e2.scene...)
-	e.npath += e2.npath
-	e.npathseg += e2.npathseg
-	e.ntrans += e2.ntrans
-}
-
 func (e *encoder) transform(m f32.Affine2D) {
 	e.scene = append(e.scene, scene.Transform(m))
 	e.ntrans++
@@ -1666,14 +1648,8 @@ func (e *encoder) line(start, end f32.Point) {
 	e.npathseg++
 }
 
-func (e *encoder) quad(start, ctrl, end f32.Point) {
-	e.scene = append(e.scene, scene.Quad(start, ctrl, end))
-	e.npathseg++
-}
-
 func (c *collector) reset() {
 	c.prevFrame, c.frame = c.frame, c.prevFrame
-	c.profile = false
 	c.clipStates = c.clipStates[:0]
 	c.transStack = c.transStack[:0]
 	c.frame.reset()
@@ -1753,8 +1729,6 @@ func (c *collector) collect(root *op.Ops, viewport image.Point, texOps *[]textur
 	c.addClip(&state, fview, fview, nil, ops.Key{}, 0, 0, false)
 	for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
-		case ops.TypeProfile:
-			c.profile = true
 		case ops.TypeTransform:
 			dop, push := ops.DecodeTransform(encOp.Data)
 			if push {
@@ -1782,7 +1756,7 @@ func (c *collector) collect(root *op.Ops, viewport image.Point, texOps *[]textur
 		case ops.TypeClip:
 			var op ops.ClipOp
 			op.Decode(encOp.Data)
-			bounds := layout.FRect(op.Bounds)
+			bounds := f32.FRect(op.Bounds)
 			c.addClip(&state, fview, bounds, pathData.data, pathData.key, pathData.hash, strWidth, true)
 			pathData.data = nil
 			strWidth = 0

gpu/gpu.go

@@ -18,9 +18,9 @@ import (
 	"time"
 	"unsafe"
 
-	"gioui.org/f32"
 	"gioui.org/gpu/internal/driver"
 	"gioui.org/internal/byteslice"
+	"gioui.org/internal/f32"
 	"gioui.org/internal/f32color"
 	"gioui.org/internal/ops"
 	"gioui.org/internal/scene"
@@ -44,14 +44,10 @@ type GPU interface {
 	Clear(color color.NRGBA)
 	// Frame draws the graphics operations from op into a viewport of target.
 	Frame(frame *op.Ops, target RenderTarget, viewport image.Point) error
-	// Profile returns the last available profiling information. Profiling
-	// information is requested when Frame sees an io/profile.Op, and the result
-	// is available through Profile at some later time.
-	Profile() string
 }
 
 type gpu struct {
-	cache *resourceCache
+	cache *textureCache
 
 	profile                                string
 	timers                                 *timers
@@ -68,22 +64,39 @@ type renderer struct {
 	pather        *pather
 	packer        packer
 	intersections packer
+	layers        packer
+	layerFBOs     fboSet
 }
 
 type drawOps struct {
-	profile     bool
-	reader      ops.Reader
-	states      []f32.Affine2D
-	transStack  []f32.Affine2D
-	vertCache   []byte
-	viewport    image.Point
-	clear       bool
-	clearColor  f32color.RGBA
-	imageOps    []imageOp
-	pathOps     []*pathOp
-	pathOpCache []pathOp
-	qs          quadSplitter
-	pathCache   *opCache
+	reader       ops.Reader
+	states       []f32.Affine2D
+	transStack   []f32.Affine2D
+	layers       []opacityLayer
+	opacityStack []int
+	vertCache    []byte
+	viewport     image.Point
+	clear        bool
+	clearColor   f32color.RGBA
+	imageOps     []imageOp
+	pathOps      []*pathOp
+	pathOpCache  []pathOp
+	qs           quadSplitter
+	pathCache    *opCache
+}
+
+type opacityLayer struct {
+	opacity float32
+	parent  int
+	// depth of the opacity stack. Layers of equal depth are
+	// independent and may be packed into one atlas.
+	depth int
+	// opStart and opEnd denote the range of drawOps.imageOps
+	// that belong to the layer.
+	opStart, opEnd int
+	// clip of the layer operations.
+	clip  image.Rectangle
+	place placement
 }
 
 type drawState struct {
@@ -127,7 +140,12 @@ type imageOp struct {
 	clip     image.Rectangle
 	material material
 	clipType clipType
-	place    placement
+	// place is either a placement in the path fbos or intersection fbos,
+	// depending on clipType.
+	place placement
+	// layerOps is the number of operations this
+	// operation replaces.
+	layerOps int
 }
 
 func decodeStrokeOp(data []byte) float32 {
@@ -154,17 +172,25 @@ type material struct {
 	// For materialTypeColor.
 	color f32color.RGBA
 	// For materialTypeLinearGradient.
-	color1 f32color.RGBA
-	color2 f32color.RGBA
+	color1  f32color.RGBA
+	color2  f32color.RGBA
+	opacity float32
 	// For materialTypeTexture.
 	data    imageOpData
+	tex     driver.Texture
 	uvTrans f32.Affine2D
 }
 
+const (
+	filterLinear  = 0
+	filterNearest = 1
+)
+
 // imageOpData is the shadow of paint.ImageOp.
 type imageOpData struct {
 	src    *image.RGBA
 	handle interface{}
+	filter byte
 }
 
 type linearGradientOpData struct {
@@ -182,10 +208,12 @@ func decodeImageOp(data []byte, refs []interface{}) imageOpData {
 	return imageOpData{
 		src:    refs[0].(*image.RGBA),
 		handle: handle,
+		filter: data[1],
 	}
 }
 
 func decodeColorOp(data []byte) color.NRGBA {
+	data = data[:ops.TypeColorLen]
 	return color.NRGBA{
 		R: data[1],
 		G: data[2],
@@ -195,6 +223,7 @@ func decodeColorOp(data []byte) color.NRGBA {
 }
 
 func decodeLinearGradientOp(data []byte) linearGradientOpData {
+	data = data[:ops.TypeLinearGradientLen]
 	bo := binary.LittleEndian
 	return linearGradientOpData{
 		stop1: f32.Point{
@@ -220,8 +249,6 @@ func decodeLinearGradientOp(data []byte) linearGradientOpData {
 	}
 }
 
-type clipType uint8
-
 type resource interface {
 	release()
 }
@@ -234,7 +261,7 @@ type texture struct {
 type blitter struct {
 	ctx                    driver.Device
 	viewport               image.Point
-	pipelines              [3]*pipeline
+	pipelines              [2][3]*pipeline
 	colUniforms            *blitColUniforms
 	texUniforms            *blitTexUniforms
 	linearGradientUniforms *blitLinearGradientUniforms
@@ -271,6 +298,9 @@ type blitUniforms struct {
 	transform     [4]float32
 	uvTransformR1 [4]float32
 	uvTransformR2 [4]float32
+	opacity       float32
+	fbo           float32
+	_             [2]float32
 }
 
 type colorUniforms struct {
@@ -282,7 +312,7 @@ type gradientUniforms struct {
 	color2 f32color.RGBA
 }
 
-type materialType uint8
+type clipType uint8
 
 const (
 	clipTypeNone clipType = iota
@@ -290,6 +320,8 @@ const (
 	clipTypeIntersection
 )
 
+type materialType uint8
+
 const (
 	materialColor materialType = iota
 	materialLinearGradient
@@ -322,7 +354,7 @@ func NewWithDevice(d driver.Device) (GPU, error) {
 
 func newGPU(ctx driver.Device) (*gpu, error) {
 	g := &gpu{
-		cache: newResourceCache(),
+		cache: newTextureCache(),
 	}
 	g.drawOps.pathCache = newOpCache()
 	if err := g.init(ctx); err != nil {
@@ -362,7 +394,7 @@ func (g *gpu) collect(viewport image.Point, frameOps *op.Ops) {
 	g.renderer.pather.viewport = viewport
 	g.drawOps.reset(viewport)
 	g.drawOps.collect(frameOps, viewport)
-	if g.drawOps.profile && g.timers == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
+	if false && g.timers == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
 		g.frameStart = time.Now()
 		g.timers = newTimers(g.ctx)
 		g.stencilTimer = g.timers.newTimer()
@@ -388,7 +420,9 @@ func (g *gpu) frame(target RenderTarget) error {
 	g.stencilTimer.end()
 	g.coverTimer.begin()
 	g.renderer.uploadImages(g.cache, g.drawOps.imageOps)
-	g.renderer.prepareDrawOps(g.cache, g.drawOps.imageOps)
+	g.renderer.prepareDrawOps(g.drawOps.imageOps)
+	g.drawOps.layers = g.renderer.packLayers(g.drawOps.layers)
+	g.renderer.drawLayers(g.drawOps.layers, g.drawOps.imageOps)
 	d := driver.LoadDesc{
 		ClearColor: g.drawOps.clearColor,
 	}
@@ -398,14 +432,14 @@ func (g *gpu) frame(target RenderTarget) error {
 	}
 	g.ctx.BeginRenderPass(defFBO, d)
 	g.ctx.Viewport(0, 0, viewport.X, viewport.Y)
-	g.renderer.drawOps(g.cache, g.drawOps.imageOps)
+	g.renderer.drawOps(false, image.Point{}, g.renderer.blitter.viewport, g.drawOps.imageOps)
 	g.coverTimer.end()
 	g.ctx.EndRenderPass()
 	g.cleanupTimer.begin()
 	g.cache.frame()
 	g.drawOps.pathCache.frame()
 	g.cleanupTimer.end()
-	if g.drawOps.profile && g.timers.ready() {
+	if false && g.timers.ready() {
 		st, covt, cleant := g.stencilTimer.Elapsed, g.coverTimer.Elapsed, g.cleanupTimer.Elapsed
 		ft := st + covt + cleant
 		q := 100 * time.Microsecond
@@ -421,20 +455,38 @@ func (g *gpu) Profile() string {
 	return g.profile
 }
 
-func (r *renderer) texHandle(cache *resourceCache, data imageOpData) driver.Texture {
+func (r *renderer) texHandle(cache *textureCache, data imageOpData) driver.Texture {
+	key := textureCacheKey{
+		filter: data.filter,
+		handle: data.handle,
+	}
+
 	var tex *texture
-	t, exists := cache.get(data.handle)
+	t, exists := cache.get(key)
 	if !exists {
 		t = &texture{
 			src: data.src,
 		}
-		cache.put(data.handle, t)
+		cache.put(key, t)
 	}
 	tex = t.(*texture)
 	if tex.tex != nil {
 		return tex.tex
 	}
-	handle, err := r.ctx.NewTexture(driver.TextureFormatSRGBA, data.src.Bounds().Dx(), data.src.Bounds().Dy(), driver.FilterLinear, driver.FilterLinear, driver.BufferBindingTexture)
+
+	var minFilter, magFilter driver.TextureFilter
+	switch data.filter {
+	case filterLinear:
+		minFilter, magFilter = driver.FilterLinearMipmapLinear, driver.FilterLinear
+	case filterNearest:
+		minFilter, magFilter = driver.FilterNearest, driver.FilterNearest
+	}
+
+	handle, err := r.ctx.NewTexture(driver.TextureFormatSRGBA,
+		data.src.Bounds().Dx(), data.src.Bounds().Dy(),
+		minFilter, magFilter,
+		driver.BufferBindingTexture,
+	)
 	if err != nil {
 		panic(err)
 	}
@@ -462,15 +514,18 @@ func newRenderer(ctx driver.Device) *renderer {
 	if cap := 8192; maxDim > cap {
 		maxDim = cap
 	}
+	d := image.Pt(maxDim, maxDim)
 
-	r.packer.maxDims = image.Pt(maxDim, maxDim)
-	r.intersections.maxDims = image.Pt(maxDim, maxDim)
+	r.packer.maxDims = d
+	r.intersections.maxDims = d
+	r.layers.maxDims = d
 	return r
 }
 
 func (r *renderer) release() {
 	r.pather.release()
 	r.blitter.release()
+	r.layerFBOs.delete(r.ctx, 0)
 }
 
 func newBlitter(ctx driver.Device) *blitter {
@@ -505,12 +560,24 @@ func newBlitter(ctx driver.Device) *blitter {
 func (b *blitter) release() {
 	b.quadVerts.Release()
 	for _, p := range b.pipelines {
-		p.Release()
+		for _, p := range p {
+			p.Release()
+		}
 	}
 }
 
-func createColorPrograms(b driver.Device, vsSrc shader.Sources, fsSrc [3]shader.Sources, uniforms [3]interface{}) ([3]*pipeline, error) {
-	var pipelines [3]*pipeline
+func createColorPrograms(b driver.Device, vsSrc shader.Sources, fsSrc [3]shader.Sources, uniforms [3]interface{}) (pipelines [2][3]*pipeline, err error) {
+	defer func() {
+		if err != nil {
+			for _, p := range pipelines {
+				for _, p := range p {
+					if p != nil {
+						p.Release()
+					}
+				}
+			}
+		}
+	}()
 	blend := driver.BlendDesc{
 		Enable:    true,
 		SrcFactor: driver.BlendFactorOne,
@@ -528,86 +595,76 @@ func createColorPrograms(b driver.Device, vsSrc shader.Sources, fsSrc [3]shader.
 		return pipelines, err
 	}
 	defer vsh.Release()
-	{
-		fsh, err := b.NewFragmentShader(fsSrc[materialTexture])
-		if err != nil {
-			return pipelines, err
+	for i, format := range []driver.TextureFormat{driver.TextureFormatOutput, driver.TextureFormatSRGBA} {
+		{
+			fsh, err := b.NewFragmentShader(fsSrc[materialTexture])
+			if err != nil {
+				return pipelines, err
+			}
+			defer fsh.Release()
+			pipe, err := b.NewPipeline(driver.PipelineDesc{
+				VertexShader:   vsh,
+				FragmentShader: fsh,
+				BlendDesc:      blend,
+				VertexLayout:   layout,
+				PixelFormat:    format,
+				Topology:       driver.TopologyTriangleStrip,
+			})
+			if err != nil {
+				return pipelines, err
+			}
+			var vertBuffer *uniformBuffer
+			if u := uniforms[materialTexture]; u != nil {
+				vertBuffer = newUniformBuffer(b, u)
+			}
+			pipelines[i][materialTexture] = &pipeline{pipe, vertBuffer}
 		}
-		defer fsh.Release()
-		pipe, err := b.NewPipeline(driver.PipelineDesc{
-			VertexShader:   vsh,
-			FragmentShader: fsh,
-			BlendDesc:      blend,
-			VertexLayout:   layout,
-			PixelFormat:    driver.TextureFormatOutput,
-			Topology:       driver.TopologyTriangleStrip,
-		})
-		if err != nil {
-			return pipelines, err
+		{
+			var vertBuffer *uniformBuffer
+			fsh, err := b.NewFragmentShader(fsSrc[materialColor])
+			if err != nil {
+				return pipelines, err
+			}
+			defer fsh.Release()
+			pipe, err := b.NewPipeline(driver.PipelineDesc{
+				VertexShader:   vsh,
+				FragmentShader: fsh,
+				BlendDesc:      blend,
+				VertexLayout:   layout,
+				PixelFormat:    format,
+				Topology:       driver.TopologyTriangleStrip,
+			})
+			if err != nil {
+				return pipelines, err
+			}
+			if u := uniforms[materialColor]; u != nil {
+				vertBuffer = newUniformBuffer(b, u)
+			}
+			pipelines[i][materialColor] = &pipeline{pipe, vertBuffer}
 		}
-		var vertBuffer *uniformBuffer
-		if u := uniforms[materialTexture]; u != nil {
-			vertBuffer = newUniformBuffer(b, u)
+		{
+			var vertBuffer *uniformBuffer
+			fsh, err := b.NewFragmentShader(fsSrc[materialLinearGradient])
+			if err != nil {
+				return pipelines, err
+			}
+			defer fsh.Release()
+			pipe, err := b.NewPipeline(driver.PipelineDesc{
+				VertexShader:   vsh,
+				FragmentShader: fsh,
+				BlendDesc:      blend,
+				VertexLayout:   layout,
+				PixelFormat:    format,
+				Topology:       driver.TopologyTriangleStrip,
+			})
+			if err != nil {
+				return pipelines, err
+			}
+			if u := uniforms[materialLinearGradient]; u != nil {
+				vertBuffer = newUniformBuffer(b, u)
+			}
+			pipelines[i][materialLinearGradient] = &pipeline{pipe, vertBuffer}
 		}
-		pipelines[materialTexture] = &pipeline{pipe, vertBuffer}
-	}
-	{
-		var vertBuffer *uniformBuffer
-		fsh, err := b.NewFragmentShader(fsSrc[materialColor])
-		if err != nil {
-			pipelines[materialTexture].Release()
-			return pipelines, err
-		}
-		defer fsh.Release()
-		pipe, err := b.NewPipeline(driver.PipelineDesc{
-			VertexShader:   vsh,
-			FragmentShader: fsh,
-			BlendDesc:      blend,
-			VertexLayout:   layout,
-			PixelFormat:    driver.TextureFormatOutput,
-			Topology:       driver.TopologyTriangleStrip,
-		})
-		if err != nil {
-			pipelines[materialTexture].Release()
-			return pipelines, err
-		}
-		if u := uniforms[materialColor]; u != nil {
-			vertBuffer = newUniformBuffer(b, u)
-		}
-		pipelines[materialColor] = &pipeline{pipe, vertBuffer}
-	}
-	{
-		var vertBuffer *uniformBuffer
-		fsh, err := b.NewFragmentShader(fsSrc[materialLinearGradient])
-		if err != nil {
-			pipelines[materialTexture].Release()
-			pipelines[materialColor].Release()
-			return pipelines, err
-		}
-		defer fsh.Release()
-		pipe, err := b.NewPipeline(driver.PipelineDesc{
-			VertexShader:   vsh,
-			FragmentShader: fsh,
-			BlendDesc:      blend,
-			VertexLayout:   layout,
-			PixelFormat:    driver.TextureFormatOutput,
-			Topology:       driver.TopologyTriangleStrip,
-		})
-		if err != nil {
-			pipelines[materialTexture].Release()
-			pipelines[materialColor].Release()
-			return pipelines, err
-		}
-		if u := uniforms[materialLinearGradient]; u != nil {
-			vertBuffer = newUniformBuffer(b, u)
-		}
-		pipelines[materialLinearGradient] = &pipeline{pipe, vertBuffer}
-	}
-	if err != nil {
-		for _, p := range pipelines {
-			p.Release()
-		}
-		return pipelines, err
 	}
 	return pipelines, nil
 }
@@ -695,8 +752,8 @@ func (r *renderer) intersectPath(p *pathOp, clip image.Rectangle) {
 	}
 	fbo := r.pather.stenciler.cover(p.place.Idx)
 	r.ctx.BindTexture(0, fbo.tex)
-	coverScale, coverOff := texSpaceTransform(layout.FRect(uv), fbo.size)
-	subScale, subOff := texSpaceTransform(layout.FRect(sub), p.clip.Size())
+	coverScale, coverOff := texSpaceTransform(f32.FRect(uv), fbo.size)
+	subScale, subOff := texSpaceTransform(f32.FRect(sub), p.clip.Size())
 	r.pather.stenciler.ipipeline.uniforms.vert.uvTransform = [4]float32{coverScale.X, coverScale.Y, coverOff.X, coverOff.Y}
 	r.pather.stenciler.ipipeline.uniforms.vert.subUVTransform = [4]float32{subScale.X, subScale.Y, subOff.X, subOff.Y}
 	r.pather.stenciler.ipipeline.pipeline.UploadUniforms(r.ctx)
@@ -745,8 +802,7 @@ func (r *renderer) packStencils(pops *[]*pathOp) {
 			ops = ops[:len(ops)-1]
 			continue
 		}
-		sz := image.Point{X: p.clip.Dx(), Y: p.clip.Dy()}
-		place, ok := r.packer.add(sz)
+		place, ok := r.packer.add(p.clip.Size())
 		if !ok {
 			// The clip area is at most the entire screen. Hopefully no
 			// screen is larger than GL_MAX_TEXTURE_SIZE.
@@ -758,14 +814,92 @@ func (r *renderer) packStencils(pops *[]*pathOp) {
 	*pops = ops
 }
 
+func (r *renderer) packLayers(layers []opacityLayer) []opacityLayer {
+	// Make every layer bounds contain nested layers; cull empty layers.
+	for i := len(layers) - 1; i >= 0; i-- {
+		l := layers[i]
+		if l.parent != -1 {
+			b := layers[l.parent].clip
+			layers[l.parent].clip = b.Union(l.clip)
+		}
+		if l.clip.Empty() {
+			layers = append(layers[:i], layers[i+1:]...)
+		}
+	}
+	// Pack layers.
+	r.layers.clear()
+	depth := 0
+	for i := range layers {
+		l := &layers[i]
+		// Only layers of the same depth may be packed together.
+		if l.depth != depth {
+			r.layers.newPage()
+		}
+		place, ok := r.layers.add(l.clip.Size())
+		if !ok {
+			// The layer area is at most the entire screen. Hopefully no
+			// screen is larger than GL_MAX_TEXTURE_SIZE.
+			panic(fmt.Errorf("layer size %v is larger than maximum texture size %v", l.clip.Size(), r.layers.maxDims))
+		}
+		l.place = place
+	}
+	return layers
+}
+
+func (r *renderer) drawLayers(layers []opacityLayer, ops []imageOp) {
+	if len(r.layers.sizes) == 0 {
+		return
+	}
+	fbo := -1
+	r.layerFBOs.resize(r.ctx, driver.TextureFormatSRGBA, r.layers.sizes)
+	for i := len(layers) - 1; i >= 0; i-- {
+		l := layers[i]
+		if fbo != l.place.Idx {
+			if fbo != -1 {
+				r.ctx.EndRenderPass()
+				r.ctx.PrepareTexture(r.layerFBOs.fbos[fbo].tex)
+			}
+			fbo = l.place.Idx
+			f := r.layerFBOs.fbos[fbo]
+			r.ctx.BeginRenderPass(f.tex, driver.LoadDesc{Action: driver.LoadActionClear})
+		}
+		v := image.Rectangle{
+			Min: l.place.Pos,
+			Max: l.place.Pos.Add(l.clip.Size()),
+		}
+		r.ctx.Viewport(v.Min.X, v.Min.Y, v.Dx(), v.Dy())
+		f := r.layerFBOs.fbos[fbo]
+		r.drawOps(true, l.clip.Min.Mul(-1), l.clip.Size(), ops[l.opStart:l.opEnd])
+		sr := f32.FRect(v)
+		uvScale, uvOffset := texSpaceTransform(sr, f.size)
+		uvTrans := f32.Affine2D{}.Scale(f32.Point{}, uvScale).Offset(uvOffset)
+		// Replace layer ops with one textured op.
+		ops[l.opStart] = imageOp{
+			clip: l.clip,
+			material: material{
+				material: materialTexture,
+				tex:      f.tex,
+				uvTrans:  uvTrans,
+				opacity:  l.opacity,
+			},
+			layerOps: l.opEnd - l.opStart - 1,
+		}
+	}
+	if fbo != -1 {
+		r.ctx.EndRenderPass()
+		r.ctx.PrepareTexture(r.layerFBOs.fbos[fbo].tex)
+	}
+}
+
 func (d *drawOps) reset(viewport image.Point) {
-	d.profile = false
 	d.viewport = viewport
 	d.imageOps = d.imageOps[:0]
 	d.pathOps = d.pathOps[:0]
 	d.pathOpCache = d.pathOpCache[:0]
 	d.vertCache = d.vertCache[:0]
 	d.transStack = d.transStack[:0]
+	d.layers = d.layers[:0]
+	d.opacityStack = d.opacityStack[:0]
 }
 
 func (d *drawOps) collect(root *op.Ops, viewport image.Point) {
@@ -798,7 +932,7 @@ func (d *drawOps) newPathOp() *pathOp {
 	return &d.pathOpCache[len(d.pathOpCache)-1]
 }
 
-func (d *drawOps) addClipPath(state *drawState, aux []byte, auxKey opKey, bounds f32.Rectangle, off f32.Point, push bool) {
+func (d *drawOps) addClipPath(state *drawState, aux []byte, auxKey opKey, bounds f32.Rectangle, off f32.Point) {
 	npath := d.newPathOp()
 	*npath = pathOp{
 		parent:    state.cpath,
@@ -821,15 +955,6 @@ func (d *drawOps) addClipPath(state *drawState, aux []byte, auxKey opKey, bounds
 	state.cpath = npath
 }
 
-// split a transform into two parts, one which is pure offset and the
-// other representing the scaling, shearing and rotation part
-func splitTransform(t f32.Affine2D) (srs f32.Affine2D, offset f32.Point) {
-	sx, hx, ox, hy, sy, oy := t.Elems()
-	offset = f32.Point{X: ox, Y: oy}
-	srs = f32.NewAffine2D(sx, hx, 0, hy, sy, 0)
-	return
-}
-
 func (d *drawOps) save(id int, state f32.Affine2D) {
 	if extra := id - len(d.states) + 1; extra > 0 {
 		d.states = append(d.states, make([]f32.Affine2D, extra)...)
@@ -860,8 +985,6 @@ func (d *drawOps) collectOps(r *ops.Reader, viewport f32.Rectangle) {
 loop:
 	for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
-		case ops.TypeProfile:
-			d.profile = true
 		case ops.TypeTransform:
 			dop, push := ops.DecodeTransform(encOp.Data)
 			if push {
@@ -873,6 +996,27 @@ loop:
 			state.t = d.transStack[n-1]
 			d.transStack = d.transStack[:n-1]
 
+		case ops.TypePushOpacity:
+			opacity := ops.DecodeOpacity(encOp.Data)
+			parent := -1
+			depth := len(d.opacityStack)
+			if depth > 0 {
+				parent = d.opacityStack[depth-1]
+			}
+			lidx := len(d.layers)
+			d.layers = append(d.layers, opacityLayer{
+				opacity: opacity,
+				parent:  parent,
+				depth:   depth,
+				opStart: len(d.imageOps),
+			})
+			d.opacityStack = append(d.opacityStack, lidx)
+		case ops.TypePopOpacity:
+			n := len(d.opacityStack)
+			idx := d.opacityStack[n-1]
+			d.layers[idx].opEnd = len(d.imageOps)
+			d.opacityStack = d.opacityStack[:n-1]
+
 		case ops.TypeStroke:
 			quads.key.strokeWidth = decodeStrokeOp(encOp.Data)
 
@@ -888,8 +1032,8 @@ loop:
 			var op ops.ClipOp
 			op.Decode(encOp.Data)
 			quads.key.outline = op.Outline
-			bounds := layout.FRect(op.Bounds)
-			trans, off := splitTransform(state.t)
+			bounds := f32.FRect(op.Bounds)
+			trans, off := state.t.Split()
 			if len(quads.aux) > 0 {
 				// There is a clipping path, build the gpu data and update the
 				// cache key such that it will be equal only if the transform is the
@@ -913,7 +1057,7 @@ loop:
 				quads.aux, bounds, _ = d.boundsForTransformedRect(bounds, trans)
 				quads.key = opKey{Key: encOp.Key}
 			}
-			d.addClipPath(&state, quads.aux, quads.key, bounds, off, true)
+			d.addClipPath(&state, quads.aux, quads.key, bounds, off)
 			quads = quadsOp{}
 		case ops.TypePopClip:
 			state.cpath = state.cpath.parent
@@ -935,7 +1079,7 @@ loop:
 			// Transform (if needed) the painting rectangle and if so generate a clip path,
 			// for those cases also compute a partialTrans that maps texture coordinates between
 			// the new bounding rectangle and the transformed original paint rectangle.
-			t, off := splitTransform(state.t)
+			t, off := state.t.Split()
 			// Fill the clip area, unless the material is a (bounded) image.
 			// TODO: Find a tighter bound.
 			inf := float32(1e6)
@@ -958,14 +1102,14 @@ loop:
 				// this transformed rectangle.
 				k := opKey{Key: encOp.Key}
 				k.SetTransform(t) // TODO: This call has no effect.
-				d.addClipPath(&state, clipData, k, bnd, off, false)
+				d.addClipPath(&state, clipData, k, bnd, off)
 			}
 
 			bounds := cl.Round()
 			mat := state.materialFor(bnd, off, partialTrans, bounds)
 
 			rect := state.cpath == nil || state.cpath.rect
-			if bounds.Min == (image.Point{}) && bounds.Max == d.viewport && rect && mat.opaque && (mat.material == materialColor) {
+			if bounds.Min == (image.Point{}) && bounds.Max == d.viewport && rect && mat.opaque && (mat.material == materialColor) && len(d.opacityStack) == 0 {
 				// The image is a uniform opaque color and takes up the whole screen.
 				// Scrap images up to and including this image and set clear color.
 				d.imageOps = d.imageOps[:0]
@@ -978,6 +1122,15 @@ loop:
 				clip:     bounds,
 				material: mat,
 			}
+			if n := len(d.opacityStack); n > 0 {
+				idx := d.opacityStack[n-1]
+				lb := d.layers[idx].clip
+				if lb.Empty() {
+					d.layers[idx].clip = img.clip
+				} else {
+					d.layers[idx].clip = lb.Union(img.clip)
+				}
+			}
 
 			d.imageOps = append(d.imageOps, img)
 			if clipData != nil {
@@ -1007,7 +1160,9 @@ func expandPathOp(p *pathOp, clip image.Rectangle) {
 }
 
 func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32.Affine2D, clip image.Rectangle) material {
-	var m material
+	m := material{
+		opacity: 1.,
+	}
 	switch d.matType {
 	case materialColor:
 		m.material = materialColor
@@ -1046,24 +1201,25 @@ func (d *drawState) materialFor(rect f32.Rectangle, off f32.Point, partTrans f32
 	return m
 }
 
-func (r *renderer) uploadImages(cache *resourceCache, ops []imageOp) {
-	for _, img := range ops {
+func (r *renderer) uploadImages(cache *textureCache, ops []imageOp) {
+	for i := range ops {
+		img := &ops[i]
 		m := img.material
 		if m.material == materialTexture {
-			r.texHandle(cache, m.data)
+			img.material.tex = r.texHandle(cache, m.data)
 		}
 	}
 }
 
-func (r *renderer) prepareDrawOps(cache *resourceCache, ops []imageOp) {
+func (r *renderer) prepareDrawOps(ops []imageOp) {
 	for _, img := range ops {
 		m := img.material
 		switch m.material {
 		case materialTexture:
-			r.ctx.PrepareTexture(r.texHandle(cache, m.data))
+			r.ctx.PrepareTexture(m.tex)
 		}
 
-		var fbo stencilFBO
+		var fbo FBO
 		switch img.clipType {
 		case clipTypeNone:
 			continue
@@ -1076,24 +1232,30 @@ func (r *renderer) prepareDrawOps(cache *resourceCache, ops []imageOp) {
 	}
 }
 
-func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
+func (r *renderer) drawOps(isFBO bool, opOff, viewport image.Point, ops []imageOp) {
 	var coverTex driver.Texture
-	for _, img := range ops {
+	for i := 0; i < len(ops); i++ {
+		img := ops[i]
+		i += img.layerOps
 		m := img.material
 		switch m.material {
 		case materialTexture:
-			r.ctx.BindTexture(0, r.texHandle(cache, m.data))
+			r.ctx.BindTexture(0, m.tex)
 		}
-		drc := img.clip
+		drc := img.clip.Add(opOff)
 
-		scale, off := clipSpaceTransform(drc, r.blitter.viewport)
-		var fbo stencilFBO
+		scale, off := clipSpaceTransform(drc, viewport)
+		var fbo FBO
+		fboIdx := 0
+		if isFBO {
+			fboIdx = 1
+		}
 		switch img.clipType {
 		case clipTypeNone:
-			p := r.blitter.pipelines[m.material]
+			p := r.blitter.pipelines[fboIdx][m.material]
 			r.ctx.BindPipeline(p.pipeline)
 			r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
-			r.blitter.blit(m.material, m.color, m.color1, m.color2, scale, off, m.uvTrans)
+			r.blitter.blit(m.material, isFBO, m.color, m.color1, m.color2, scale, off, m.opacity, m.uvTrans)
 			continue
 		case clipTypePath:
 			fbo = r.pather.stenciler.cover(img.place.Idx)
@@ -1108,16 +1270,20 @@ func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
 			Min: img.place.Pos,
 			Max: img.place.Pos.Add(drc.Size()),
 		}
-		coverScale, coverOff := texSpaceTransform(layout.FRect(uv), fbo.size)
-		p := r.pather.coverer.pipelines[m.material]
+		coverScale, coverOff := texSpaceTransform(f32.FRect(uv), fbo.size)
+		p := r.pather.coverer.pipelines[fboIdx][m.material]
 		r.ctx.BindPipeline(p.pipeline)
 		r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
-		r.pather.cover(m.material, m.color, m.color1, m.color2, scale, off, m.uvTrans, coverScale, coverOff)
+		r.pather.cover(m.material, isFBO, m.color, m.color1, m.color2, scale, off, m.uvTrans, coverScale, coverOff)
 	}
 }
 
-func (b *blitter) blit(mat materialType, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, uvTrans f32.Affine2D) {
-	p := b.pipelines[mat]
+func (b *blitter) blit(mat materialType, fbo bool, col f32color.RGBA, col1, col2 f32color.RGBA, scale, off f32.Point, opacity float32, uvTrans f32.Affine2D) {
+	fboIdx := 0
+	if fbo {
+		fboIdx = 1
+	}
+	p := b.pipelines[fboIdx][mat]
 	b.ctx.BindPipeline(p.pipeline)
 	var uniforms *blitUniforms
 	switch mat {
@@ -1126,18 +1292,23 @@ func (b *blitter) blit(mat materialType, col f32color.RGBA, col1, col2 f32color.
 		uniforms = &b.colUniforms.blitUniforms
 	case materialTexture:
 		t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
-		b.texUniforms.blitUniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
-		b.texUniforms.blitUniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
 		uniforms = &b.texUniforms.blitUniforms
+		uniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
+		uniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
 	case materialLinearGradient:
 		b.linearGradientUniforms.color1 = col1
 		b.linearGradientUniforms.color2 = col2
 
 		t1, t2, t3, t4, t5, t6 := uvTrans.Elems()
-		b.linearGradientUniforms.blitUniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
-		b.linearGradientUniforms.blitUniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
 		uniforms = &b.linearGradientUniforms.blitUniforms
+		uniforms.uvTransformR1 = [4]float32{t1, t2, t3, 0}
+		uniforms.uvTransformR2 = [4]float32{t4, t5, t6, 0}
 	}
+	uniforms.fbo = 0
+	if fbo {
+		uniforms.fbo = 1
+	}
+	uniforms.opacity = opacity
 	uniforms.transform = [4]float32{scale.X, scale.Y, off.X, off.Y}
 	p.UploadUniforms(b.ctx)
 	b.ctx.DrawArrays(0, 4)
@@ -1334,7 +1505,9 @@ func decodeToOutlineQuads(qs *quadSplitter, tr f32.Affine2D, pathData []byte) {
 			q = q.Transform(tr)
 			qs.splitAndEncode(q)
 		case scene.OpCubic:
-			for _, q := range stroke.SplitCubic(scene.DecodeCubic(cmd)) {
+			from, ctrl0, ctrl1, to := scene.DecodeCubic(cmd)
+			qs.scratch = stroke.SplitCubic(from, ctrl0, ctrl1, to, qs.scratch[:0])
+			for _, q := range qs.scratch {
 				q = q.Transform(tr)
 				qs.splitAndEncode(q)
 			}

gpu/headless/driver_test.go

@@ -8,7 +8,7 @@ import (
 	"image"
 	"image/color"
 	"image/png"
-	"io/ioutil"
+	"os"
 	"runtime"
 	"testing"
 
@@ -122,7 +122,7 @@ func TestFramebuffers(t *testing.T) {
 	sz := image.Point{X: 800, Y: 600}
 	var (
 		col1 = color.NRGBA{R: 0xac, G: 0xbd, B: 0xef, A: 0xde}
-		col2 = color.NRGBA{R: 0xfe, G: 0xba, B: 0xbe, A: 0xca}
+		col2 = color.NRGBA{R: 0xfe, G: 0xbb, B: 0xbe, A: 0xca}
 	)
 	fbo1 := newFBO(t, b, sz)
 	fbo2 := newFBO(t, b, sz)
@@ -202,5 +202,5 @@ func saveImage(file string, img image.Image) error {
 	if err := png.Encode(&buf, img); err != nil {
 		return err
 	}
-	return ioutil.WriteFile(file, buf.Bytes(), 0666)
+	return os.WriteFile(file, buf.Bytes(), 0666)
 }

gpu/headless/headless.go

@@ -80,7 +80,7 @@ func NewWindow(width, height int) (*Window, error) {
 		)
 		if err != nil {
 			dev.Release()
-			return nil
+			return err
 		}
 		// Note that the gpu takes ownership of dev.
 		gp, err := gpu.NewWithDevice(dev)

gpu/headless/headless_darwin.go

@@ -10,10 +10,10 @@ import (
 )
 
 /*
-#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fmodules -fobjc-arc -x objective-c
-#cgo LDFLAGS: -framework CoreGraphics
+#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fobjc-arc -x objective-c
+#cgo LDFLAGS: -framework CoreGraphics -framework Metal -framework Foundation
 
-@import Metal;
+#import <Metal/Metal.h>
 
 static CFTypeRef createDevice(void) {
 	@autoreleasepool {

gpu/headless/headless_egl.go

@@ -10,7 +10,7 @@ import (
 )
 
 func init() {
-	newContextFallback = func() (context, error) {
+	newContextPrimary = func() (context, error) {
 		return egl.NewContext(egl.EGL_DEFAULT_DISPLAY)
 	}
 }

gpu/headless/headless_test.go

@@ -7,7 +7,6 @@ import (
 	"image/color"
 	"testing"
 
-	"gioui.org/f32"
 	"gioui.org/internal/f32color"
 	"gioui.org/op"
 	"gioui.org/op/clip"
@@ -50,20 +49,14 @@ func TestClipping(t *testing.T) {
 	var ops op.Ops
 	paint.ColorOp{Color: col}.Add(&ops)
 	clip.RRect{
-		Rect: f32.Rectangle{
-			Min: f32.Point{X: 50, Y: 50},
-			Max: f32.Point{X: 250, Y: 250},
-		},
-		SE: 75,
+		Rect: image.Rect(50, 50, 250, 250),
+		SE:   75,
 	}.Push(&ops)
 	paint.PaintOp{}.Add(&ops)
 	paint.ColorOp{Color: col2}.Add(&ops)
 	clip.RRect{
-		Rect: f32.Rectangle{
-			Min: f32.Point{X: 100, Y: 100},
-			Max: f32.Point{X: 350, Y: 350},
-		},
-		NW: 75,
+		Rect: image.Rect(100, 100, 350, 350),
+		NW:   75,
 	}.Push(&ops)
 	paint.PaintOp{}.Add(&ops)
 	if err := w.Frame(&ops); err != nil {

gpu/headless/headless_vulkan.go

@@ -21,7 +21,7 @@ type vkContext struct {
 }
 
 func init() {
-	newContextPrimary = newVulkanContext
+	newContextFallback = newVulkanContext
 }
 
 func newVulkanContext() (context, error) {

gpu/internal/d3d11/d3d11_windows.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"image"
 	"math"
+	"math/bits"
 	"unsafe"
 
 	"golang.org/x/sys/windows"
@@ -58,6 +59,7 @@ type Texture struct {
 
 	width   int
 	height  int
+	mipmap  bool
 	foreign bool
 }
 
@@ -219,17 +221,33 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
 	default:
 		return nil, fmt.Errorf("unsupported texture format %d", format)
 	}
+	bindFlags := convBufferBinding(bindings)
+	miscFlags := uint32(0)
+	mipmap := minFilter == driver.FilterLinearMipmapLinear
+	nmipmaps := 1
+	if mipmap {
+		// Flags required by ID3D11DeviceContext::GenerateMips.
+		bindFlags |= d3d11.BIND_SHADER_RESOURCE | d3d11.BIND_RENDER_TARGET
+		miscFlags |= d3d11.RESOURCE_MISC_GENERATE_MIPS
+		dim := width
+		if height > dim {
+			dim = height
+		}
+		log2 := 32 - bits.LeadingZeros32(uint32(dim)) - 1
+		nmipmaps = log2 + 1
+	}
 	tex, err := b.dev.CreateTexture2D(&d3d11.TEXTURE2D_DESC{
 		Width:     uint32(width),
 		Height:    uint32(height),
-		MipLevels: 1,
+		MipLevels: uint32(nmipmaps),
 		ArraySize: 1,
 		Format:    d3dfmt,
 		SampleDesc: d3d11.DXGI_SAMPLE_DESC{
 			Count:   1,
 			Quality: 0,
 		},
-		BindFlags: convBufferBinding(bindings),
+		BindFlags: bindFlags,
+		MiscFlags: miscFlags,
 	})
 	if err != nil {
 		return nil, err
@@ -247,6 +265,8 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
 			filter = d3d11.FILTER_MIN_MAG_MIP_POINT
 		case minFilter == driver.FilterLinear && magFilter == driver.FilterLinear:
 			filter = d3d11.FILTER_MIN_MAG_LINEAR_MIP_POINT
+		case minFilter == driver.FilterLinearMipmapLinear && magFilter == driver.FilterLinear:
+			filter = d3d11.FILTER_MIN_MAG_MIP_LINEAR
 		default:
 			d3d11.IUnknownRelease(unsafe.Pointer(tex), tex.Vtbl.Release)
 			return nil, fmt.Errorf("unsupported texture filter combination %d, %d", minFilter, magFilter)
@@ -325,7 +345,7 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
 			return nil, err
 		}
 	}
-	return &Texture{backend: b, format: d3dfmt, tex: tex, sampler: sampler, resView: resView, uaView: uaView, renderTarget: fbo, bindings: bindings, width: width, height: height}, nil
+	return &Texture{backend: b, format: d3dfmt, tex: tex, sampler: sampler, resView: resView, uaView: uaView, renderTarget: fbo, bindings: bindings, width: width, height: height, mipmap: mipmap}, nil
 }
 
 func (b *Backend) newInputLayout(vertexShader shader.Sources, layout []driver.InputDesc) (*d3d11.InputLayout, error) {
@@ -609,6 +629,9 @@ func (t *Texture) Upload(offset, size image.Point, pixels []byte, stride int) {
 	}
 	res := (*d3d11.Resource)(unsafe.Pointer(t.tex))
 	t.backend.ctx.UpdateSubresource(res, dst, uint32(stride), uint32(len(pixels)), pixels)
+	if t.mipmap {
+		t.backend.ctx.GenerateMips(t.resView)
+	}
 }
 
 func (t *Texture) Release() {