wip

Signed-off-by: Elias Naur <mail@eliasnaur.com>
2026-07-01 07:35:40 +00:00 · 2022-04-06 13:22:45 +02:00
235 changed files with 12098 additions and 12931 deletions
@@ -24,7 +24,7 @@ environment:
 tasks:
 - install_go: |
     mkdir -p /home/build/sdk
-     curl -s https://dl.google.com/go/go1.19.11.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl -s https://dl.google.com/go/go1.17.7.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
 - prepare_toolchain: |
     mkdir -p $APPLE_TOOLCHAIN_ROOT
     cd $APPLE_TOOLCHAIN_ROOT
@@ -62,3 +62,13 @@ tasks:
 - test_ios: |
     cd gio
     CC=$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:$PATH
+     gogio -target ios -o app.app gioui.org/example/kitchen
@@ -16,7 +16,10 @@ environment:
 tasks:
 - install_go: |
     mkdir -p /home/build/sdk
-     curl https://dl.google.com/go/go1.19.11.freebsd-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl https://dl.google.com/go/go1.17.7.freebsd-amd64.tar.gz | tar -C /home/build/sdk -xzf -
 - test_gio: |
     cd gio
     go test ./...
+ - test_cmd: |
+     cd gio/cmd
+     go test ./...
@@ -3,7 +3,6 @@ image: debian/testing
 packages:
 - curl
 - pkg-config
- - gcc-multilib
 - libwayland-dev
 - libx11-dev
 - libx11-xcb-dev
@@ -25,11 +24,12 @@ packages:
 - scrot
 - sway
 - grim
+ - wine
 - unzip
 sources:
 - https://git.sr.ht/~eliasnaur/gio
 environment:
- PKG_CONFIG_PATH: /usr/lib/x86_64-linux-gnu/pkgconfig/:/usr/lib/i386-linux-gnu/pkgconfig/
+ GOFLAGS: -mod=readonly
 PATH: /home/build/sdk/go/bin:/usr/bin:/home/build/go/bin:/home/build/android/tools/bin
 ANDROID_SDK_ROOT: /home/build/android
 android_sdk_tools_zip: sdk-tools-linux-3859397.zip
@@ -40,7 +40,7 @@ secrets:
 tasks:
 - install_go: |
     mkdir -p /home/build/sdk
-     curl -s https://dl.google.com/go/go1.19.11.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
+     curl -s https://dl.google.com/go/go1.17.7.linux-amd64.tar.gz | tar -C /home/build/sdk -xzf -
 - check_gofmt: |
     cd gio
     test -z "$(gofmt -s -l .)"
@@ -54,17 +54,9 @@ 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: |
@@ -72,6 +64,10 @@ tasks:
     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
@@ -91,3 +87,15 @@ tasks:
     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"
@@ -10,9 +10,12 @@ environment:
 tasks:
 - install_go: |
     mkdir -p /home/build/sdk
-     curl https://dl.google.com/go/go1.19.11.src.tar.gz | tar -C /home/build/sdk -xzf -
+     curl https://dl.google.com/go/go1.17.7.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 ./...
@@ -0,0 +1,2 @@
+.gradle
+**/android/build
@@ -24,12 +24,3 @@ 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.
@@ -5,30 +5,16 @@ 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);

-            layer = new FrameLayout(this);
-            view = new GioView(this);
+		this.view = new GioView(this);

-            view.setLayoutParams(new FrameLayout.LayoutParams(
-                FrameLayout.LayoutParams.MATCH_PARENT,
-                FrameLayout.LayoutParams.MATCH_PARENT
-            ));
-            view.setFocusable(true);
-            view.setFocusableInTouchMode(true);
-
-            layer.addView(view);
-            setContentView(layer);
+		setContentView(view);
 	}

 	@Override public void onDestroy() {
@@ -26,7 +26,6 @@ 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;
@@ -106,8 +105,6 @@ 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);
@@ -258,59 +255,6 @@ 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);
@@ -611,11 +555,7 @@ public final class GioView extends SurfaceView implements Choreographer.FrameCal
 		@Override public int getCursorCapsMode(int reqModes) {
 			Snippet snip = getSnippet();
 			int selStart = imeSelectionStart(nhandle);
-			int off = imeToUTF16(nhandle, selStart - snip.offset);
-			if (off < 0 || off > snip.snippet.length()) {
-				return 0;
-			}
-			return TextUtils.getCapsMode(snip.snippet, off, reqModes);
+			return TextUtils.getCapsMode(snip.snippet, imeToUTF16(nhandle, selStart), reqModes);
 		}

 		@Override public ExtractedText getExtractedText(ExtractedTextRequest request, int flags) {
@@ -4,7 +4,6 @@ package app

 import (
 	"os"
-	"path/filepath"
 	"strings"
 )

@@ -15,29 +14,11 @@ import (
 // Set with the go linker flag -X.
 var extraArgs string

-// 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 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. Default value of ID is filepath.Base(os.Args[0]).
-var ID = ""
-
 func init() {
 	if extraArgs != "" {
 		args := strings.Split(extraArgs, "|")
 		os.Args = append(os.Args, args...)
 	}
-	if ID == "" {
-		ID = filepath.Base(os.Args[0])
-	}
 }

 // DataDir returns a path to use for application-specific
@@ -20,7 +20,7 @@ type d3d11Context struct {
 	width, height int
 }

-const debugDirectX = false
+const debug = 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 debugDirectX {
+			if debug {
 				flags |= d3d11.CREATE_DEVICE_DEBUG
 			}
 			dev, ctx, _, err := d3d11.CreateDevice(
@@ -122,7 +122,7 @@ func (c *d3d11Context) Release() {
 		d3d11.IUnknownRelease(unsafe.Pointer(c.dev), c.dev.Vtbl.Release)
 	}
 	*c = d3d11Context{}
-	if debugDirectX {
+	if debug {
 		d3d11.ReportLiveObjects()
 	}
 }
@@ -6,7 +6,7 @@ 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
@@ -34,7 +34,7 @@ For example:
 A program must keep receiving events from the event channel until
 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.
@@ -56,13 +56,14 @@ For example, to display a blank but otherwise functional window:
 		app.Main()
 	}

-# Event queue
+
+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
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: Unlicense OR MIT

-//go:build !noopengl
-
 package app

 /*
@@ -1,9 +1,8 @@
 // SPDX-License-Identifier: Unlicense OR MIT

-//go:build ((linux && !android) || freebsd) && !nowayland && !noopengl
+//go:build ((linux && !android) || freebsd) && !nowayland
 // +build linux,!android freebsd
 // +build !nowayland
-// +build !noopengl

 package app

@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: Unlicense OR MIT

-//go:build !noopengl
-
 package app

 import (
@@ -1,9 +1,8 @@
 // SPDX-License-Identifier: Unlicense OR MIT

-//go:build ((linux && !android) || freebsd || openbsd) && !nox11 && !noopengl
+//go:build ((linux && !android) || freebsd || openbsd) && !nox11
 // +build linux,!android freebsd openbsd
 // +build !nox11
-// +build !noopengl

 package app

@@ -13,7 +13,6 @@ import (
 type glContext struct {
 	ctx js.Value
 	cnv js.Value
-	w   *window
 }

 func newContext(w *window) (*glContext, error) {
@@ -33,15 +32,11 @@ 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
 }

@@ -53,6 +48,9 @@ func (c *glContext) Release() {
 }

 func (c *glContext) Present() error {
+	if c.ctx.Call("isContextLost").Bool() {
+		return errors.New("context lost")
+	}
 	return nil
 }

@@ -63,15 +61,7 @@ func (c *glContext) Lock() error {
 func (c *glContext) Unlock() {}

 func (c *glContext) Refresh() error {
-	switch c.w.contextStatus {
-	case contextStatusLost:
-		return errOutOfDate
-	case contextStatusRestored:
-		c.w.contextStatus = contextStatusOkay
-		return gpu.ErrDeviceLost
-	default:
-		return nil
-	}
+	return nil
 }

 func (w *window) NewContext() (context, error) {
@@ -16,9 +16,6 @@ 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>
@@ -2,7 +2,8 @@

 // +build darwin,!ios,nometal

-#import <AppKit/AppKit.h>
+@import AppKit;
+
 #include <CoreFoundation/CoreFoundation.h>
 #include <OpenGL/OpenGL.h>
 #include "_cgo_export.h"
@@ -9,7 +9,6 @@ import (
 	"testing"
 	"unicode/utf8"

-	"gioui.org/font"
 	"gioui.org/font/gofont"
 	"gioui.org/io/key"
 	"gioui.org/io/router"
@@ -29,14 +28,14 @@ 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.NewShaper(text.WithCollection(gofont.Collection()))
+		cache := text.NewCache(gofont.Collection())
 		e := new(widget.Editor)
 		e.Focus()

 		var r router.Router
 		gtx := layout.Context{Ops: new(op.Ops), Queue: &r}
 		// Layout once to register focus.
-		e.Layout(gtx, cache, font.Font{}, unit.Sp(10), op.CallOp{}, op.CallOp{})
+		e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
 		r.Frame(gtx.Ops)

 		var state editorState
@@ -104,32 +103,11 @@ func FuzzIME(f *testing.F) {
 				}
 			}
 			cmds = cmds[cmdLen:]
-			e.Layout(gtx, cache, font.Font{}, unit.Sp(10), op.CallOp{}, op.CallOp{})
+			e.Layout(gtx, cache, text.Font{}, unit.Px(10), nil)
 			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)
 			}
@@ -47,13 +47,6 @@ 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
@@ -120,16 +113,7 @@ const (

 	HWND_TOPMOST = ^(uint32(1) - 1) // -1

-	HTCAPTION     = 2
-	HTCLIENT      = 1
-	HTLEFT        = 10
-	HTRIGHT       = 11
-	HTTOP         = 12
-	HTTOPLEFT     = 13
-	HTTOPRIGHT    = 14
-	HTBOTTOM      = 15
-	HTBOTTOMLEFT  = 16
-	HTBOTTOMRIGHT = 17
+	HTCLIENT = 1

 	IDC_APPSTARTING = 32650 // Standard arrow and small hourglass
 	IDC_ARROW       = 32512 // Standard arrow
@@ -162,16 +146,13 @@ 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
@@ -250,9 +231,6 @@ const (
 	WM_MOUSEMOVE            = 0x0200
 	WM_MOUSEWHEEL           = 0x020A
 	WM_MOUSEHWHEEL          = 0x020E
-	WM_NCACTIVATE           = 0x0086
-	WM_NCHITTEST            = 0x0084
-	WM_NCCALCSIZE           = 0x0083
 	WM_PAINT                = 0x000F
 	WM_QUIT                 = 0x0012
 	WM_SETCURSOR            = 0x0020
@@ -268,7 +246,7 @@ const (
 	WM_USER                 = 0x0400
 	WM_WINDOWPOSCHANGED     = 0x0047

-	WS_CLIPCHILDREN     = 0x02000000
+	WS_CLIPCHILDREN     = 0x00010000
 	WS_CLIPSIBLINGS     = 0x04000000
 	WS_MAXIMIZE         = 0x01000000
 	WS_ICONIC           = 0x20000000
@@ -338,7 +316,6 @@ 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")
@@ -387,9 +364,6 @@ 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) {
@@ -441,14 +415,6 @@ 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 {
@@ -533,11 +499,6 @@ 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.
@@ -136,10 +136,6 @@ 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
 	}
@@ -223,9 +219,6 @@ 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
 }
@@ -12,11 +12,10 @@ import (
 )

 /*
-#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
-#cgo LDFLAGS: -framework QuartzCore -framework Metal
+#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc

-#import <Metal/Metal.h>
-#import <QuartzCore/CAMetalLayer.h>
+@import Metal;
+@import QuartzCore.CAMetalLayer;

 #include <CoreFoundation/CoreFoundation.h>

@@ -6,10 +6,12 @@
 package app

 /*
-#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
+#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
+
+@import AppKit;
+
+@import QuartzCore.CAMetalLayer;

-#import <AppKit/AppKit.h>
-#import <QuartzCore/CAMetalLayer.h>
 #include <CoreFoundation/CoreFoundation.h>

 CALayer *gio_layerFactory(void) {
@@ -41,11 +41,10 @@ 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
-	// 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.
@@ -165,6 +164,10 @@ type driver interface {
 	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()
 	// Perform actions on the window.
@@ -154,7 +154,7 @@ type window struct {

 	dpi       int
 	fontScale float32
-	insets    pixelInsets
+	insets    system.Insets

 	stage     system.Stage
 	started   bool
@@ -195,10 +195,6 @@ var gioView struct {
 	updateCaret        C.jmethodID
 }

-type pixelInsets struct {
-	top, bottom, left, right int
-}
-
 // ViewEvent is sent whenever the Window's underlying Android view
 // changes.
 type ViewEvent struct {
@@ -314,7 +310,7 @@ const (
 )

 func (w *window) NewContext() (context, error) {
-	funcs := []func(w *window) (context, error){newAndroidGLESContext, newAndroidVulkanContext}
+	funcs := []func(w *window) (context, error){newAndroidVulkanContext, newAndroidGLESContext}
 	var firstErr error
 	for _, f := range funcs {
 		if f == nil {
@@ -338,6 +334,20 @@ 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
 }
@@ -375,22 +385,6 @@ 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)

@@ -554,7 +548,7 @@ 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.StageInactive {
+	if w.stage >= system.StageRunning {
 		w.draw(env, true)
 	}
 }
@@ -565,7 +559,7 @@ func Java_org_gioui_GioView_onFrameCallback(env *C.JNIEnv, class C.jclass, view
 	if !exist {
 		return
 	}
-	if w.stage < system.StageInactive {
+	if w.stage < system.StageRunning {
 		return
 	}
 	if w.animating {
@@ -577,7 +571,9 @@ 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)
-	if w.callbacks.Event(key.Event{Name: key.NameBack}) {
+	ev := &system.CommandEvent{Type: system.CommandBack}
+	w.callbacks.Event(ev)
+	if ev.Cancel {
 		return C.JNI_TRUE
 	}
 	return C.JNI_FALSE
@@ -592,13 +588,13 @@ func Java_org_gioui_GioView_onFocusChange(env *C.JNIEnv, class C.jclass, view C.
 //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 = pixelInsets{
-		top:    int(top),
-		bottom: int(bottom),
-		left:   int(left),
-		right:  int(right),
+	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.StageInactive {
+	if w.stage >= system.StageRunning {
 		w.draw(env, true)
 	}
 }
@@ -836,18 +832,11 @@ func (w *window) draw(env *C.JNIEnv, sync bool) {
 	}
 	const inchPrDp = 1.0 / 160
 	ppdp := float32(w.dpi) * inchPrDp
-	dppp := unit.Dp(1.0 / ppdp)
-	insets := system.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.callbacks.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
 			Now:    time.Now(),
 			Size:   w.config.Size,
-			Insets: insets,
+			Insets: w.insets,
 			Metric: unit.Metric{
 				PxPerDp: ppdp,
 				PxPerSp: w.fontScale * ppdp,
@@ -878,6 +867,8 @@ 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")
@@ -917,14 +908,6 @@ 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
 	}
@@ -934,9 +917,19 @@ 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 && keyCode == C.AKEYCODE_DPAD_CENTER {
-		w.callbacks.ClickFocus()
-		return
+	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 n, ok := convertKeyCode(keyCode); ok {
 		state := key.Release
@@ -1064,12 +1057,6 @@ 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)
 }
@@ -1147,37 +1134,20 @@ func (w *window) ShowTextInput(show bool) {
 func (w *window) SetInputHint(mode key.InputHint) {
 	// Constants defined at https://developer.android.com/reference/android/text/InputType.
 	const (
-		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
+		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
 	)

 	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
 		}
@@ -1349,12 +1319,16 @@ func (w *window) Configure(options []Option) {
 		if cnf.Decorated != prev.Decorated {
 			w.config.Decorated = cnf.Decorated
 		}
-		w.callbacks.Event(ConfigEvent{Config: w.config})
+		if w.config != prev {
+			w.callbacks.Event(ConfigEvent{Config: w.config})
+		}
 	})
 }

 func (w *window) Perform(system.Action) {}

+func (w *window) Raise() {}
+
 func (w *window) SetCursor(cursor pointer.Cursor) {
 	runInJVM(javaVM(), func(env *C.JNIEnv) {
 		setCursor(env, w.view, cursor)
@@ -1432,6 +1406,9 @@ 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() {
@@ -6,7 +6,7 @@ package app
 #include <Foundation/Foundation.h>

 __attribute__ ((visibility ("hidden"))) void gio_wakeupMainThread(void);
-__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createDisplayLink(void);
+__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createDisplayLink(uintptr_t handle);
 __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"
-	"sync"
+	"runtime/cgo"
 	"sync/atomic"
 	"time"
 	"unicode/utf16"
@@ -70,9 +70,6 @@ type displayLink struct {
 	running uint32
 }

-// displayLinks maps CFTypeRefs to *displayLinks.
-var displayLinks sync.Map
-
 var mainFuncs = make(chan func(), 1)

 // runOnMain runs the function on the main thread.
@@ -131,18 +128,18 @@ func NewDisplayLink(callback func()) (*displayLink, error) {
 		states:   make(chan bool),
 		dids:     make(chan uint64),
 	}
-	dl := C.gio_createDisplayLink()
+	h := cgo.NewHandle(d)
+	dl := C.gio_createDisplayLink(C.uintptr_t(h))
 	if dl == 0 {
 		return nil, errors.New("app: failed to create display link")
 	}
-	go d.run(dl)
+	go d.run(dl, h)
 	return d, nil
 }

-func (d *displayLink) run(dl C.CFTypeRef) {
+func (d *displayLink) run(dl C.CFTypeRef, h cgo.Handle) {
 	defer C.gio_releaseDisplayLink(dl)
-	displayLinks.Store(dl, d)
-	defer displayLinks.Delete(dl)
+	defer h.Delete()
 	var stopTimer *time.Timer
 	var tchan <-chan time.Time
 	started := false
@@ -203,14 +200,10 @@ func (d *displayLink) SetDisplayID(did uint64) {
 }

 //export gio_onFrameCallback
-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()
+func gio_onFrameCallback(dl C.CFTypeRef, handle C.uintptr_t) {
+	d := cgo.Handle(handle).Value().(*displayLink)
+	if atomic.LoadUint32(&d.running) != 0 {
+		d.callback()
 	}
 }

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: Unlicense OR MIT

-#import <Foundation/Foundation.h>
+@import Dispatch;
+@import Foundation;

 #include "_cgo_export.h"

@@ -150,11 +150,6 @@ func (w *window) draw(sync bool) {
 		w.w.Event(system.StageEvent{Stage: system.StageRunning})
 	}
 	const inchPrDp = 1.0 / 163
-	m := unit.Metric{
-		PxPerDp: float32(params.dpi) * inchPrDp,
-		PxPerSp: float32(params.sdpi) * inchPrDp,
-	}
-	dppp := unit.Dp(1. / m.PxPerDp)
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
 			Now: time.Now(),
@@ -163,12 +158,15 @@ func (w *window) draw(sync bool) {
 				Y: int(params.height + .5),
 			},
 			Insets: system.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,
+				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,
 			},
-			Metric: m,
 		},
 		Sync: sync,
 	})
@@ -278,15 +276,20 @@ func (w *window) WriteClipboard(s string) {
 }

 func (w *window) Configure([]Option) {
+	prev := w.config
 	// Decorations are never disabled.
 	w.config.Decorated = true
-	w.w.Event(ConfigEvent{Config: w.config})
+	if w.config != prev {
+		w.w.Event(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 {
@@ -343,6 +346,9 @@ 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
@@ -123,9 +123,6 @@ static void handleTouches(int last, UIView *view, NSSet<UITouch *> *touches, UIE

@implementation GioView
 NSArray<UIKeyCommand *> *_keyCommands;
-+ (void)onFrameCallback:(CADisplayLink *)link {
-       gio_onFrameCallback((__bridge CFTypeRef)link);
-}
 + (Class)layerClass {
    return gio_layerClass();
 }
@@ -230,8 +227,23 @@ NSArray<UIKeyCommand *> *_keyCommands;
 }
@end

-CFTypeRef gio_createDisplayLink(void) {
-	CADisplayLink *dl = [CADisplayLink displayLinkWithTarget:[GioView class] selector:@selector(onFrameCallback:)];
+@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:)];
 	dl.paused = YES;
 	NSRunLoop *runLoop = [NSRunLoop mainRunLoop];
 	[dl addToRunLoop:runLoop forMode:[runLoop currentMode]];
@@ -22,17 +22,7 @@ import (
 	"gioui.org/unit"
 )

-type ViewEvent struct {
-	Element js.Value
-}
-
-type contextStatus int
-
-const (
-	contextStatusOkay contextStatus = iota
-	contextStatusLost
-	contextStatusRestored
-)
+type ViewEvent struct{}

 type window struct {
 	window                js.Value
@@ -64,8 +54,6 @@ type window struct {
 	// is pending.
 	animRequested bool
 	wakeups       chan struct{}
-
-	contextStatus contextStatus
 }

 func newWindow(win *callbacks, options []Option) error {
@@ -113,7 +101,6 @@ func newWindow(win *callbacks, options []Option) error {
 		w.w.SetDriver(w)
 		w.Configure(options)
 		w.blur()
-		w.w.Event(ViewEvent{Element: cont})
 		w.w.Event(system.StageEvent{Stage: system.StageRunning})
 		w.resize()
 		w.draw(true)
@@ -175,25 +162,9 @@ 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.requestRedraw()
-		return nil
-	})
 	w.addEventListener(w.visualViewport, "resize", func(this js.Value, args []js.Value) interface{} {
 		w.resize()
-		w.requestRedraw()
+		w.chanRedraw <- struct{}{}
 		return nil
 	})
 	w.addEventListener(w.window, "contextmenu", func(this js.Value, args []js.Value) interface{} {
@@ -201,9 +172,12 @@ func (w *window) addEventListeners() {
 		return nil
 	})
 	w.addEventListener(w.window, "popstate", func(this js.Value, args []js.Value) interface{} {
-		if w.w.Event(key.Event{Name: key.NameBack}) {
+		ev := &system.CommandEvent{Type: system.CommandBack}
+		w.w.Event(ev)
+		if ev.Cancel {
 			return w.browserHistory.Call("forward")
 		}
+
 		return w.browserHistory.Call("back")
 	})
 	w.addEventListener(w.document, "visibilitychange", func(this js.Value, args []js.Value) interface{} {
@@ -236,10 +210,6 @@ 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
@@ -358,8 +328,6 @@ func (w *window) keyboard(hint key.InputHint) {
 		m = "url"
 	case key.HintTelephone:
 		m = "tel"
-	case key.HintPassword:
-		m = "password"
 	default:
 		m = "text"
 	}
@@ -568,11 +536,15 @@ func (w *window) Configure(options []Option) {
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
 	}
-	w.w.Event(ConfigEvent{Config: w.config})
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }

 func (w *window) Perform(system.Action) {}

+func (w *window) Raise() {}
+
 var webCursor = [...]string{
 	pointer.CursorDefault:                  "default",
 	pointer.CursorNone:                     "none",
@@ -630,6 +602,9 @@ 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())

@@ -657,14 +632,10 @@ func (w *window) resize() {
 }

 func (w *window) draw(sync bool) {
-	if w.contextStatus == contextStatusLost {
-		return
-	}
 	size, insets, metric := w.getConfig()
 	if metric == (unit.Metric{}) || size.X == 0 || size.Y == 0 {
 		return
 	}
-
 	w.w.Event(frameEvent{
 		FrameEvent: system.FrameEvent{
 			Now:    time.Now(),
@@ -677,11 +648,10 @@ func (w *window) draw(sync bool) {
 }

 func (w *window) getConfig() (image.Point, system.Insets, unit.Metric) {
-	invscale := unit.Dp(1. / w.scale)
 	return image.Pt(w.config.Size.X, w.config.Size.Y),
 		system.Insets{
-			Bottom: unit.Dp(w.inset.Y) * invscale,
-			Right:  unit.Dp(w.inset.X) * invscale,
+			Bottom: unit.Px(w.inset.Y),
+			Right:  unit.Px(w.inset.X),
 		}, unit.Metric{
 			PxPerDp: w.scale,
 			PxPerSp: w.scale,
@@ -735,13 +705,6 @@ func (w *window) navigationColor(c color.NRGBA) {
 	theme.Set("content", fmt.Sprintf("#%06X", []uint8{rgba.R, rgba.G, rgba.B}))
 }

-func (w *window) requestRedraw() {
-	select {
-	case w.chanRedraw <- struct{}{}:
-	default:
-	}
-}
-
 func osMain() {
 	select {}
 }
@@ -13,7 +13,7 @@ import (
 	"unicode"
 	"unicode/utf8"

-	"gioui.org/internal/f32"
+	"gioui.org/f32"
 	"gioui.org/io/clipboard"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
@@ -24,8 +24,7 @@ import (
 )

 /*
-#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fobjc-arc -x objective-c
-#cgo LDFLAGS: -framework AppKit -framework QuartzCore
+#cgo CFLAGS: -DGL_SILENCE_DEPRECATION -Werror -Wno-deprecated-declarations -fmodules -fobjc-arc -x objective-c

 #include <AppKit/AppKit.h>

@@ -99,31 +98,6 @@ static NSWindowStyleMask getWindowStyleMask(CFTypeRef windowRef) {
 	return [window styleMask];
 }

-static void setWindowStyleMask(CFTypeRef windowRef, NSWindowStyleMask mask) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	window.styleMask = mask;
-}
-
-static void setWindowTitleVisibility(CFTypeRef windowRef, NSWindowTitleVisibility state) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	window.titleVisibility = state;
-}
-
-static void setWindowTitlebarAppearsTransparent(CFTypeRef windowRef, int transparent) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	window.titlebarAppearsTransparent = (BOOL)transparent;
-}
-
-static void setWindowStandardButtonHidden(CFTypeRef windowRef, NSWindowButton btn, int hide) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	[window standardWindowButton:btn].hidden = (BOOL)hide;
-}
-
-static void performWindowDragWithEvent(CFTypeRef windowRef, CFTypeRef evt) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	[window performWindowDragWithEvent:(__bridge NSEvent*)evt];
-}
-
 static void closeWindow(CFTypeRef windowRef) {
 	NSWindow* window = (__bridge NSWindow *)windowRef;
 	[window performClose:nil];
@@ -171,26 +145,11 @@ static void setTitle(CFTypeRef windowRef, CFTypeRef titleRef) {
 	window.title = (__bridge NSString *)titleRef;
 }

-static int isWindowZoomed(CFTypeRef windowRef) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	return window.zoomed ? 1 : 0;
-}
-
-static void zoomWindow(CFTypeRef windowRef) {
-	NSWindow *window = (__bridge NSWindow *)windowRef;
-	[window zoom:nil];
-}
-
 static CFTypeRef layerForView(CFTypeRef viewRef) {
 	NSView *view = (__bridge NSView *)viewRef;
 	return (__bridge CFTypeRef)view.layer;
 }

-static CFTypeRef windowForView(CFTypeRef viewRef) {
-	NSView *view = (__bridge NSView *)viewRef;
-	return (__bridge CFTypeRef)view.window;
-}
-
 static void raiseWindow(CFTypeRef windowRef) {
 	NSWindow* window = (__bridge NSWindow *)windowRef;
 	[window makeKeyAndOrderFront:nil];
@@ -242,14 +201,14 @@ type ViewEvent struct {

 type window struct {
 	view        C.CFTypeRef
+	window      C.CFTypeRef
 	w           *callbacks
 	stage       system.Stage
 	displayLink *displayLink
 	// redraw is a single entry channel for making sure only one
 	// display link redraw request is in flight.
-	redraw      chan struct{}
-	cursor      pointer.Cursor
-	pointerBtns pointer.Buttons
+	redraw chan struct{}
+	cursor pointer.Cursor

 	scale  float32
 	config Config
@@ -309,13 +268,12 @@ func (w *window) WriteClipboard(s string) {
 }

 func (w *window) updateWindowMode() {
-	style := int(C.getWindowStyleMask(C.windowForView(w.view)))
-	if style&C.NSWindowStyleMaskFullScreen != 0 {
+	style := int(C.getWindowStyleMask(w.window))
+	if style&C.NSWindowStyleMaskFullScreen > 0 {
 		w.config.Mode = Fullscreen
 	} else {
 		w.config.Mode = Windowed
 	}
-	w.config.Decorated = style&C.NSWindowStyleMaskFullSizeContentView == 0
 }

 func (w *window) Configure(options []Option) {
@@ -325,89 +283,81 @@ func (w *window) Configure(options []Option) {
 	w.updateWindowMode()
 	cnf := w.config
 	cnf.apply(cfg, options)
-	window := C.windowForView(w.view)
+	// Decorations are never disabled.
+	cnf.Decorated = true

 	switch cnf.Mode {
 	case Fullscreen:
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			C.unhideWindow(window)
+			C.unhideWindow(w.window)
 			fallthrough
 		default:
 			w.config.Mode = Fullscreen
-			C.toggleFullScreen(window)
+			C.toggleFullScreen(w.window)
 		}
 	case Minimized:
 		switch prev.Mode {
 		case Minimized, Fullscreen:
 		default:
 			w.config.Mode = Minimized
-			C.hideWindow(window)
+			C.hideWindow(w.window)
 		}
 	case Maximized:
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			C.unhideWindow(window)
+			C.unhideWindow(w.window)
 			fallthrough
 		default:
 			w.config.Mode = Maximized
+			r := C.getScreenFrame(w.window) // the screen size of the window
+			C.setScreenFrame(w.window, C.CGFloat(0), C.CGFloat(0), r.size.width, r.size.height)
+			w.config.Size = image.Pt(int(r.size.width), int(r.size.height))
 			w.setTitle(prev, cnf)
-			if C.isWindowZoomed(window) == 0 {
-				C.zoomWindow(window)
-			}
 		}
 	case Windowed:
 		switch prev.Mode {
 		case Fullscreen:
-			C.toggleFullScreen(window)
+			w.config.Mode = Windowed
+			C.toggleFullScreen(w.window)
 		case Minimized:
-			C.unhideWindow(window)
+			w.config.Mode = Windowed
+			C.unhideWindow(w.window)
 		case Maximized:
-		}
-		w.config.Mode = Windowed
-		if C.isWindowZoomed(window) != 0 {
-			C.zoomWindow(window)
+			w.config.Mode = Windowed
 		}
 		w.setTitle(prev, cnf)
 		if prev.Size != cnf.Size {
 			w.config.Size = cnf.Size
 			cnf.Size = cnf.Size.Div(int(screenScale))
-			C.setSize(window, C.CGFloat(cnf.Size.X), C.CGFloat(cnf.Size.Y))
+			C.setSize(w.window, C.CGFloat(cnf.Size.X), C.CGFloat(cnf.Size.Y))
 		}
 		if prev.MinSize != cnf.MinSize {
 			w.config.MinSize = cnf.MinSize
 			cnf.MinSize = cnf.MinSize.Div(int(screenScale))
-			C.setMinSize(window, C.CGFloat(cnf.MinSize.X), C.CGFloat(cnf.MinSize.Y))
+			C.setMinSize(w.window, C.CGFloat(cnf.MinSize.X), C.CGFloat(cnf.MinSize.Y))
 		}
 		if prev.MaxSize != cnf.MaxSize {
 			w.config.MaxSize = cnf.MaxSize
 			cnf.MaxSize = cnf.MaxSize.Div(int(screenScale))
-			C.setMaxSize(window, C.CGFloat(cnf.MaxSize.X), C.CGFloat(cnf.MaxSize.Y))
+			C.setMaxSize(w.window, C.CGFloat(cnf.MaxSize.X), C.CGFloat(cnf.MaxSize.Y))
+		}
+		if cnf.center {
+			r := C.getScreenFrame(w.window) // the screen size of the window
+			sz := w.config.Size
+			x := (int(r.size.width) - sz.X) / 2
+			y := (int(r.size.height) - sz.Y) / 2
+			C.setScreenFrame(w.window, C.CGFloat(x), C.CGFloat(y), C.CGFloat(sz.X), C.CGFloat(sz.Y))
 		}
 	}
 	if cnf.Decorated != prev.Decorated {
 		w.config.Decorated = cnf.Decorated
-		mask := C.getWindowStyleMask(window)
-		style := C.NSWindowStyleMask(C.NSWindowStyleMaskTitled | C.NSWindowStyleMaskResizable | C.NSWindowStyleMaskMiniaturizable | C.NSWindowStyleMaskClosable)
-		style = C.NSWindowStyleMaskFullSizeContentView
-		mask &^= style
-		barTrans := C.int(C.NO)
-		titleVis := C.NSWindowTitleVisibility(C.NSWindowTitleVisible)
-		if !cnf.Decorated {
-			mask |= style
-			barTrans = C.YES
-			titleVis = C.NSWindowTitleHidden
-		}
-		C.setWindowTitlebarAppearsTransparent(window, barTrans)
-		C.setWindowTitleVisibility(window, titleVis)
-		C.setWindowStyleMask(window, mask)
-		C.setWindowStandardButtonHidden(window, C.NSWindowCloseButton, barTrans)
-		C.setWindowStandardButtonHidden(window, C.NSWindowMiniaturizeButton, barTrans)
-		C.setWindowStandardButtonHidden(window, C.NSWindowZoomButton, barTrans)
 	}
-	w.w.Event(ConfigEvent{Config: w.config})
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }

 func (w *window) setTitle(prev, cnf Config) {
@@ -415,29 +365,11 @@ func (w *window) setTitle(prev, cnf Config) {
 		w.config.Title = cnf.Title
 		title := stringToNSString(cnf.Title)
 		defer C.CFRelease(title)
-		C.setTitle(C.windowForView(w.view), title)
+		C.setTitle(w.window, title)
 	}
 }

-func (w *window) Perform(acts system.Action) {
-	window := C.windowForView(w.view)
-	walkActions(acts, func(a system.Action) {
-		switch a {
-		case system.ActionCenter:
-			r := C.getScreenFrame(window) // the screen size of the window
-			screenScale := float32(C.getScreenBackingScale())
-			sz := w.config.Size.Div(int(screenScale))
-			x := (int(r.size.width) - sz.X) / 2
-			y := (int(r.size.height) - sz.Y) / 2
-			C.setScreenFrame(window, C.CGFloat(x), C.CGFloat(y), C.CGFloat(sz.X), C.CGFloat(sz.Y))
-		case system.ActionRaise:
-			C.raiseWindow(window)
-		}
-	})
-	if acts&system.ActionClose != 0 {
-		C.closeWindow(window)
-	}
-}
+func (w *window) Perform(system.Action) {}

 func (w *window) SetCursor(cursor pointer.Cursor) {
 	w.cursor = windowSetCursor(w.cursor, cursor)
@@ -465,6 +397,10 @@ func (w *window) SetAnimating(anim bool) {
 	}
 }

+func (w *window) Raise() {
+	C.raiseWindow(w.window)
+}
+
 func (w *window) runOnMain(f func()) {
 	runOnMain(func() {
 		// Make sure the view is still valid. The window might've been closed
@@ -475,6 +411,10 @@ func (w *window) runOnMain(f func()) {
 	})
 }

+func (w *window) Close() {
+	C.closeWindow(w.window)
+}
+
 func (w *window) setStage(stage system.Stage) {
 	if stage == w.stage {
 		return
@@ -511,50 +451,40 @@ func gio_onText(view, cstr C.CFTypeRef) {
 }

 //export gio_onMouse
-func gio_onMouse(view, evt C.CFTypeRef, cdir C.int, cbtn C.NSInteger, x, y, dx, dy C.CGFloat, ti C.double, mods C.NSUInteger) {
-	w := mustView(view)
-	t := time.Duration(float64(ti)*float64(time.Second) + .5)
-	xf, yf := float32(x)*w.scale, float32(y)*w.scale
-	dxf, dyf := float32(dx)*w.scale, float32(dy)*w.scale
-	pos := f32.Point{X: xf, Y: yf}
-	var btn pointer.Buttons
-	switch cbtn {
-	case 0:
-		btn = pointer.ButtonPrimary
-	case 1:
-		btn = pointer.ButtonSecondary
-	case 2:
-		btn = pointer.ButtonTertiary
-	}
+func gio_onMouse(view C.CFTypeRef, cdir C.int, cbtns C.NSUInteger, x, y, dx, dy C.CGFloat, ti C.double, mods C.NSUInteger) {
 	var typ pointer.Type
 	switch cdir {
 	case C.MOUSE_MOVE:
 		typ = pointer.Move
 	case C.MOUSE_UP:
 		typ = pointer.Release
-		w.pointerBtns &^= btn
 	case C.MOUSE_DOWN:
 		typ = pointer.Press
-		w.pointerBtns |= btn
-		act, ok := w.w.ActionAt(pos)
-		if ok && w.config.Mode != Fullscreen {
-			switch act {
-			case system.ActionMove:
-				C.performWindowDragWithEvent(C.windowForView(w.view), evt)
-				return
-			}
-		}
 	case C.MOUSE_SCROLL:
 		typ = pointer.Scroll
 	default:
 		panic("invalid direction")
 	}
+	var btns pointer.Buttons
+	if cbtns&(1<<0) != 0 {
+		btns |= pointer.ButtonPrimary
+	}
+	if cbtns&(1<<1) != 0 {
+		btns |= pointer.ButtonSecondary
+	}
+	if cbtns&(1<<2) != 0 {
+		btns |= pointer.ButtonTertiary
+	}
+	t := time.Duration(float64(ti)*float64(time.Second) + .5)
+	w := mustView(view)
+	xf, yf := float32(x)*w.scale, float32(y)*w.scale
+	dxf, dyf := float32(dx)*w.scale, float32(dy)*w.scale
 	w.w.Event(pointer.Event{
 		Type:      typ,
 		Source:    pointer.Mouse,
 		Time:      t,
-		Buttons:   w.pointerBtns,
-		Position:  pos,
+		Buttons:   btns,
+		Position:  f32.Point{X: xf, Y: yf},
 		Scroll:    f32.Point{X: dxf, Y: dyf},
 		Modifiers: convertMods(mods),
 	})
@@ -570,13 +500,6 @@ func gio_onDraw(view C.CFTypeRef) {
 func gio_onFocus(view C.CFTypeRef, focus C.int) {
 	w := mustView(view)
 	w.w.Event(key.FocusEvent{Focus: focus == 1})
-	if w.stage >= system.StageInactive {
-		if focus == 0 {
-			w.setStage(system.StageInactive)
-		} else {
-			w.setStage(system.StageRunning)
-		}
-	}
 	w.SetCursor(w.cursor)
 }

@@ -713,11 +636,7 @@ func gio_insertText(view, cstr C.CFTypeRef, crng C.NSRange) {
 	str := nsstringToString(cstr)
 	w.w.EditorReplace(rng, str)
 	w.w.SetComposingRegion(key.Range{Start: -1, End: -1})
-	start := rng.Start
-	if rng.End < start {
-		start = rng.End
-	}
-	pos := start + utf8.RuneCountInString(str)
+	pos := rng.Start + utf8.RuneCountInString(str)
 	w.w.SetEditorSelection(key.Range{Start: pos, End: pos})
 }

@@ -791,12 +710,14 @@ func configFor(scale float32) unit.Metric {
 func gio_onClose(view C.CFTypeRef) {
 	w := mustView(view)
 	w.w.Event(ViewEvent{})
+	deleteView(view)
 	w.w.Event(system.DestroyEvent{})
 	w.displayLink.Close()
-	w.displayLink = nil
-	deleteView(view)
 	C.CFRelease(w.view)
+	C.CFRelease(w.window)
 	w.view = 0
+	w.window = 0
+	w.displayLink = nil
 }

 //export gio_onHide
@@ -855,18 +776,16 @@ func newWindow(win *callbacks, options []Option) error {
 		}
 		errch <- nil
 		w.w = win
-		window := C.gio_createWindow(w.view, 0, 0, 0, 0, 0, 0)
-		w.updateWindowMode()
+		w.window = C.gio_createWindow(w.view, 0, 0, 0, 0, 0, 0)
 		win.SetDriver(w)
 		w.Configure(options)
 		if nextTopLeft.x == 0 && nextTopLeft.y == 0 {
 			// cascadeTopLeftFromPoint treats (0, 0) as a no-op,
 			// and just returns the offset we need for the first window.
-			nextTopLeft = C.cascadeTopLeftFromPoint(window, nextTopLeft)
+			nextTopLeft = C.cascadeTopLeftFromPoint(w.window, nextTopLeft)
 		}
-		nextTopLeft = C.cascadeTopLeftFromPoint(window, nextTopLeft)
-		// makeKeyAndOrderFront assumes ownership of our window reference.
-		C.makeKeyAndOrderFront(window)
+		nextTopLeft = C.cascadeTopLeftFromPoint(w.window, nextTopLeft)
+		C.makeKeyAndOrderFront(w.window)
 		layer := C.layerForView(w.view)
 		w.w.Event(ViewEvent{View: uintptr(w.view), Layer: uintptr(layer)})
 	})
@@ -2,7 +2,7 @@

 // +build darwin,!ios

-#import <AppKit/AppKit.h>
+@import AppKit;

 #include "_cgo_export.h"

@@ -45,6 +45,11 @@ __attribute__ ((visibility ("hidden"))) CALayer *gio_layerFactory(void);
 	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);
+}
@end

 static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFloat dy) {
@@ -56,7 +61,7 @@ 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, (__bridge CFTypeRef)event, typ, event.buttonNumber, p.x, height - p.y, dx, dy, [event timestamp], [event modifierFlags]);
+	gio_onMouse((__bridge CFTypeRef)view, typ, [NSEvent pressedMouseButtons], p.x, height - p.y, dx, dy, [event timestamp], [event modifierFlags]);
 }

@interface GioView : NSView <CALayerDelegate,NSTextInputClient>
@@ -81,41 +86,30 @@ static void handleMouse(NSView *view, NSEvent *event, int typ, CGFloat dx, CGFlo
 	layer.delegate = self;
 	return layer;
 }
- (void)viewDidMoveToWindow {
-	if (self.window == nil) {
-		gio_onClose((__bridge CFTypeRef)self);
-	}
-}
 - (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;
@@ -199,14 +193,14 @@ 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);
+	gio_onFrameCallback(dl, (uintptr_t)handle);
 	return kCVReturnSuccess;
 }

-CFTypeRef gio_createDisplayLink(void) {
+CFTypeRef gio_createDisplayLink(uintptr_t handle) {
 	CVDisplayLinkRef dl;
 	CVDisplayLinkCreateWithActiveCGDisplays(&dl);
-	CVDisplayLinkSetOutputCallback(dl, displayLinkCallback, nil);
+	CVDisplayLinkSetOutputCallback(dl, displayLinkCallback, (void *)(handle));
 	return dl;
 }

@@ -363,6 +357,7 @@ 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;
 	}
@@ -12,6 +12,7 @@ import (
 	"fmt"
 	"image"
 	"io"
+	"io/ioutil"
 	"math"
 	"os"
 	"os/exec"
@@ -94,10 +95,7 @@ type wlDisplay struct {

 	// Notification pipe fds.
 	notify struct {
-		read int
-
-		mu    sync.Mutex
-		write int
+		read, write int
 	}

 	repeat repeatState
@@ -170,23 +168,7 @@ type window struct {
 	cursor struct {
 		theme  *C.struct_wl_cursor_theme
 		cursor *C.struct_wl_cursor
-		// system is the active cursor for system gestures
-		// such as border resizes and window moves. It
-		// is nil if the pointer is not in a system gesture
-		// area.
-		system  *C.struct_wl_cursor
-		surf    *C.struct_wl_surface
-		cursors struct {
-			pointer         *C.struct_wl_cursor
-			resizeNorth     *C.struct_wl_cursor
-			resizeSouth     *C.struct_wl_cursor
-			resizeWest      *C.struct_wl_cursor
-			resizeEast      *C.struct_wl_cursor
-			resizeNorthWest *C.struct_wl_cursor
-			resizeNorthEast *C.struct_wl_cursor
-			resizeSouthWest *C.struct_wl_cursor
-			resizeSouthEast *C.struct_wl_cursor
-		}
+		surf   *C.struct_wl_surface
 	}

 	fling struct {
@@ -376,28 +358,14 @@ func (d *wlDisplay) createNativeWindow(options []Option) (*window, error) {
 		w.destroy()
 		return nil, errors.New("wayland: xdg_surface_get_toplevel failed")
 	}
-
-	id := C.CString(ID)
-	defer C.free(unsafe.Pointer(id))
-	C.xdg_toplevel_set_app_id(w.topLvl, id)
-
-	cursorTheme := C.CString(os.Getenv("XCURSOR_THEME"))
-	defer C.free(unsafe.Pointer(cursorTheme))
-	cursorSize := 32
-	if envSize, ok := os.LookupEnv("XCURSOR_SIZE"); ok && envSize != "" {
-		size, err := strconv.Atoi(envSize)
-		if err == nil {
-			cursorSize = size
-		}
-	}
-
-	w.cursor.theme = C.wl_cursor_theme_load(cursorTheme, C.int(cursorSize*w.scale), d.shm)
+	w.cursor.theme = C.wl_cursor_theme_load(nil, 32, d.shm)
 	if w.cursor.theme == nil {
 		w.destroy()
 		return nil, errors.New("wayland: wl_cursor_theme_load failed")
 	}
-	w.loadCursors()
-	w.cursor.cursor = w.cursor.cursors.pointer
+	cname := C.CString("left_ptr")
+	defer C.free(unsafe.Pointer(cname))
+	w.cursor.cursor = C.wl_cursor_theme_get_cursor(w.cursor.theme, cname)
 	if w.cursor.cursor == nil {
 		w.destroy()
 		return nil, errors.New("wayland: wl_cursor_theme_get_cursor failed")
@@ -407,7 +375,6 @@ func (d *wlDisplay) createNativeWindow(options []Option) (*window, error) {
 		w.destroy()
 		return nil, errors.New("wayland: wl_compositor_create_surface failed")
 	}
-	C.wl_surface_set_buffer_scale(w.cursor.surf, C.int32_t(w.scale))
 	C.xdg_wm_base_add_listener(d.wm, &C.gio_xdg_wm_base_listener, unsafe.Pointer(w.surf))
 	C.wl_surface_add_listener(w.surf, &C.gio_surface_listener, unsafe.Pointer(w.surf))
 	C.xdg_surface_add_listener(w.wmSurf, &C.gio_xdg_surface_listener, unsafe.Pointer(w.surf))
@@ -421,33 +388,6 @@ func (d *wlDisplay) createNativeWindow(options []Option) (*window, error) {
 	return w, nil
 }

-func (w *window) loadCursors() {
-	w.cursor.cursors.pointer = w.loadCursor(pointer.CursorDefault)
-	w.cursor.cursors.resizeNorth = w.loadCursor(pointer.CursorNorthResize)
-	w.cursor.cursors.resizeSouth = w.loadCursor(pointer.CursorSouthResize)
-	w.cursor.cursors.resizeWest = w.loadCursor(pointer.CursorWestResize)
-	w.cursor.cursors.resizeEast = w.loadCursor(pointer.CursorEastResize)
-	w.cursor.cursors.resizeSouthWest = w.loadCursor(pointer.CursorSouthWestResize)
-	w.cursor.cursors.resizeSouthEast = w.loadCursor(pointer.CursorSouthEastResize)
-	w.cursor.cursors.resizeNorthWest = w.loadCursor(pointer.CursorNorthWestResize)
-	w.cursor.cursors.resizeNorthEast = w.loadCursor(pointer.CursorNorthEastResize)
-}
-
-func (w *window) loadCursor(name pointer.Cursor) *C.struct_wl_cursor {
-	if name == pointer.CursorNone {
-		return nil
-	}
-	xcursor := xCursor[name]
-	cname := C.CString(xcursor)
-	defer C.free(unsafe.Pointer(cname))
-	c := C.wl_cursor_theme_get_cursor(w.cursor.theme, cname)
-	if c == nil {
-		// Fall back to default cursor.
-		c = w.cursor.cursors.pointer
-	}
-	return c
-}
-
 func callbackDelete(k unsafe.Pointer) {
 	callbackMap.Delete(k)
 }
@@ -583,12 +523,6 @@ func gio_onToplevelDecorationConfigure(data unsafe.Pointer, deco *C.struct_zxdg_
 		w.config.Decorated = true
 	}
 	if decorated != w.config.Decorated {
-		w.setWindowConstraints()
-		if w.config.Decorated {
-			w.size.Y -= int(w.config.decoHeight)
-		} else {
-			w.size.Y += int(w.config.decoHeight)
-		}
 		w.w.Event(ConfigEvent{Config: w.config})
 		w.redraw = true
 	}
@@ -626,7 +560,7 @@ func gio_onOutputDone(data unsafe.Pointer, output *C.struct_wl_output) {
 	d := callbackLoad(data).(*wlDisplay)
 	conf := d.outputConfig[output]
 	for _, w := range conf.windows {
-		w.updateOutputs()
+		w.redraw = true
 	}
 }

@@ -694,7 +628,15 @@ func gio_onRegistryGlobal(data unsafe.Pointer, reg *C.struct_wl_registry, name C
 		}
 		callbackStore(unsafe.Pointer(s), d.seat)
 		C.wl_seat_add_listener(s, &C.gio_seat_listener, unsafe.Pointer(s))
-		d.bindDataDevice()
+		if d.dataDeviceManager == nil {
+			break
+		}
+		d.seat.dataDev = C.wl_data_device_manager_get_data_device(d.dataDeviceManager, s)
+		if d.seat.dataDev == nil {
+			break
+		}
+		callbackStore(unsafe.Pointer(d.seat.dataDev), d.seat)
+		C.wl_data_device_add_listener(d.seat.dataDev, &C.gio_data_device_listener, unsafe.Pointer(d.seat.dataDev))
 	case "wl_shm":
 		d.shm = (*C.struct_wl_shm)(C.wl_registry_bind(reg, name, &C.wl_shm_interface, 1))
 	case "xdg_wm_base":
@@ -706,7 +648,6 @@ func gio_onRegistryGlobal(data unsafe.Pointer, reg *C.struct_wl_registry, name C
 		d.imm = (*C.struct_zwp_text_input_manager_v3)(C.wl_registry_bind(reg, name, &C.zwp_text_input_manager_v3_interface, 1))*/
 	case "wl_data_device_manager":
 		d.dataDeviceManager = (*C.struct_wl_data_device_manager)(C.wl_registry_bind(reg, name, &C.wl_data_device_manager_interface, 3))
-		d.bindDataDevice()
 	}
 }

@@ -906,20 +847,6 @@ func gio_onPointerButton(data unsafe.Pointer, p *C.struct_wl_pointer, serial, t,
 	default:
 		return
 	}
-	if state == 1 && btn == pointer.ButtonPrimary {
-		if _, edge := w.systemGesture(); edge != 0 {
-			w.resize(serial, edge)
-			return
-		}
-		act, ok := w.w.ActionAt(w.lastPos)
-		if ok && w.config.Mode == Windowed {
-			switch act {
-			case system.ActionMove:
-				w.move(serial)
-				return
-			}
-		}
-	}
 	var typ pointer.Type
 	switch state {
 	case 0:
@@ -956,12 +883,7 @@ func gio_onPointerAxis(data unsafe.Pointer, p *C.struct_wl_pointer, t, axis C.ui
 	case C.WL_POINTER_AXIS_HORIZONTAL_SCROLL:
 		w.scroll.dist.X += v
 	case C.WL_POINTER_AXIS_VERTICAL_SCROLL:
-		// horizontal scroll if shift + mousewheel(up/down) pressed.
-		if w.disp.xkb.Modifiers() == key.ModShift {
-			w.scroll.dist.X += v
-		} else {
-			w.scroll.dist.Y += v
-		}
+		w.scroll.dist.Y += v
 	}
 }

@@ -1011,12 +933,7 @@ func gio_onPointerAxisDiscrete(data unsafe.Pointer, p *C.struct_wl_pointer, axis
 	case C.WL_POINTER_AXIS_HORIZONTAL_SCROLL:
 		w.scroll.steps.X += int(discrete)
 	case C.WL_POINTER_AXIS_VERTICAL_SCROLL:
-		// horizontal scroll if shift + mousewheel(up/down) pressed.
-		if w.disp.xkb.Modifiers() == key.ModShift {
-			w.scroll.steps.X += int(discrete)
-		} else {
-			w.scroll.steps.Y += int(discrete)
-		}
+		w.scroll.steps.Y += int(discrete)
 	}
 }

@@ -1030,7 +947,7 @@ func (w *window) ReadClipboard() {
 	// Don't let slow clipboard transfers block event loop.
 	go func() {
 		defer r.Close()
-		data, _ := io.ReadAll(r)
+		data, _ := ioutil.ReadAll(r)
 		w.clipReads <- clipboard.Event{Text: string(data)}
 		w.Wakeup()
 	}()
@@ -1045,7 +962,6 @@ func (w *window) Configure(options []Option) {
 	prev := w.config
 	cnf := w.config
 	cnf.apply(cfg, options)
-	w.config.decoHeight = cnf.decoHeight

 	switch cnf.Mode {
 	case Fullscreen:
@@ -1088,36 +1004,25 @@ func (w *window) Configure(options []Option) {
 		w.setTitle(prev, cnf)
 		if prev.Size != cnf.Size {
 			w.config.Size = cnf.Size
-			w.config.Size.Y += int(w.decoHeight()) * w.scale
-			w.size = w.config.Size.Div(w.scale)
+			w.size = cnf.Size.Div(w.scale)
+		}
+		if prev.MinSize != cnf.MinSize {
+			w.config.MinSize = cnf.MinSize
+			C.xdg_toplevel_set_min_size(w.topLvl, C.int32_t(cnf.MinSize.X), C.int32_t(cnf.MinSize.Y))
+		}
+		if prev.MaxSize != cnf.MaxSize {
+			w.config.MaxSize = cnf.MaxSize
+			C.xdg_toplevel_set_max_size(w.topLvl, C.int32_t(cnf.MaxSize.X), C.int32_t(cnf.MaxSize.Y))
 		}
-		w.config.MinSize = cnf.MinSize
-		w.config.MaxSize = cnf.MaxSize
-		w.setWindowConstraints()
 	}
-	w.w.Event(ConfigEvent{Config: w.config})
-	w.redraw = true
-}
-
-func (w *window) setWindowConstraints() {
-	decoHeight := w.decoHeight()
-	if scaled := w.config.MinSize.Div(w.scale); scaled != (image.Point{}) {
-		C.xdg_toplevel_set_min_size(w.topLvl, C.int32_t(scaled.X), C.int32_t(scaled.Y+decoHeight))
+	if cnf.Decorated != prev.Decorated {
+		w.config.Decorated = cnf.Decorated
 	}
-	if scaled := w.config.MaxSize.Div(w.scale); scaled != (image.Point{}) {
-		C.xdg_toplevel_set_max_size(w.topLvl, C.int32_t(scaled.X), C.int32_t(scaled.Y+decoHeight))
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
 	}
 }

-// decoHeight returns the adjustment for client-side decorations, if applicable.
-// The unit is in surface-local coordinates.
-func (w *window) decoHeight() int {
-	if !w.config.Decorated {
-		return int(w.config.decoHeight)
-	}
-	return 0
-}
-
 func (w *window) setTitle(prev, cnf Config) {
 	if prev.Title != cnf.Title {
 		w.config.Title = cnf.Title
@@ -1128,62 +1033,88 @@ func (w *window) setTitle(prev, cnf Config) {
 }

 func (w *window) Perform(actions system.Action) {
-	// NB. there is no way for a minimized window to be unminimized.
-	// https://wayland.app/protocols/xdg-shell#xdg_toplevel:request:set_minimized
 	walkActions(actions, func(action system.Action) {
 		switch action {
-		case system.ActionClose:
-			w.dead = true
+		case system.ActionMove:
+			w.move()
+		default:
+			w.resize(action)
 		}
 	})
 }

-func (w *window) move(serial C.uint32_t) {
-	s := w.seat
-	if !w.inCompositor && s != nil {
+func (w *window) move() {
+	if !w.inCompositor && w.seat != nil {
 		w.inCompositor = true
-		C.xdg_toplevel_move(w.topLvl, s.seat, serial)
+		s := w.seat
+		C.xdg_toplevel_move(w.topLvl, s.seat, s.serial)
 	}
 }

-func (w *window) resize(serial, edge C.uint32_t) {
-	s := w.seat
-	if w.inCompositor || s == nil {
+func (w *window) resize(a system.Action) {
+	if w.inCompositor || w.seat == nil {
+		return
+	}
+	var edge int
+	switch a {
+	case system.ActionResizeNorth:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_TOP
+	case system.ActionResizeSouth:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM
+	case system.ActionResizeEast:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_LEFT
+	case system.ActionResizeWest:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_RIGHT
+	case system.ActionResizeNorthWest:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT
+	case system.ActionResizeNorthEast:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT
+	case system.ActionResizeSouthEast:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT
+	case system.ActionResizeSouthWest:
+		edge = C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT
+	default:
 		return
 	}
 	w.inCompositor = true
-	C.xdg_toplevel_resize(w.topLvl, s.seat, serial, edge)
+	s := w.seat
+	C.xdg_toplevel_resize(w.topLvl, s.seat, s.serial, C.uint32_t(edge))
+}
+
+func (w *window) Raise() {
+	// NB. there is no way for a minimized window to be unminimized.
+	// https://wayland.app/protocols/xdg-shell#xdg_toplevel:request:set_minimized
 }

 func (w *window) SetCursor(cursor pointer.Cursor) {
-	w.cursor.cursor = w.loadCursor(cursor)
-	w.updateCursor()
-}
-
-func (w *window) updateCursor() {
 	ptr := w.disp.seat.pointer
 	if ptr == nil {
 		return
 	}
+	if cursor == pointer.CursorNone {
+		C.wl_pointer_set_cursor(ptr, w.serial, nil, 0, 0)
+		return
+	}
+
+	xcursor := xCursor[cursor]
+	cname := C.CString(xcursor)
+	defer C.free(unsafe.Pointer(cname))
+	c := C.wl_cursor_theme_get_cursor(w.cursor.theme, cname)
+	if c == nil {
+		return
+	}
+	w.cursor.cursor = c
 	w.setCursor(ptr, w.serial)
 }

 func (w *window) setCursor(pointer *C.struct_wl_pointer, serial C.uint32_t) {
-	c := w.cursor.system
-	if c == nil {
-		c = w.cursor.cursor
-	}
-	if c == nil {
-		C.wl_pointer_set_cursor(pointer, w.serial, nil, 0, 0)
-		return
-	}
 	// Get images[0].
-	img := *c.images
+	img := *w.cursor.cursor.images
 	buf := C.wl_cursor_image_get_buffer(img)
 	if buf == nil {
 		return
 	}
-	C.wl_pointer_set_cursor(pointer, serial, w.cursor.surf, C.int32_t(img.hotspot_x/C.uint(w.scale)), C.int32_t(img.hotspot_y/C.uint(w.scale)))
+	C.wl_pointer_set_cursor(pointer, serial, w.cursor.surf, C.int32_t(img.hotspot_x), C.int32_t(img.hotspot_y))
 	C.wl_surface_attach(w.cursor.surf, buf, 0, 0)
 	C.wl_surface_damage(w.cursor.surf, 0, 0, C.int32_t(img.width), C.int32_t(img.height))
 	C.wl_surface_commit(w.cursor.surf)
@@ -1375,19 +1306,6 @@ func (w *window) loop() error {
 	return nil
 }

-// bindDataDevice initializes the dataDev field if and only if both
-// the seat and dataDeviceManager fields are initialized.
-func (d *wlDisplay) bindDataDevice() {
-	if d.seat != nil && d.dataDeviceManager != nil {
-		d.seat.dataDev = C.wl_data_device_manager_get_data_device(d.dataDeviceManager, d.seat.seat)
-		if d.seat.dataDev == nil {
-			return
-		}
-		callbackStore(unsafe.Pointer(d.seat.dataDev), d.seat)
-		C.wl_data_device_add_listener(d.seat.dataDev, &C.gio_data_device_listener, unsafe.Pointer(d.seat.dataDev))
-	}
-}
-
 func (d *wlDisplay) dispatch(p *poller) error {
 	dispfd := C.wl_display_get_fd(d.disp)
 	// Poll for events and notifications.
@@ -1445,11 +1363,6 @@ func (w *window) SetAnimating(anim bool) {
 // Wakeup wakes up the event loop through the notification pipe.
 func (d *wlDisplay) wakeup() {
 	oneByte := make([]byte, 1)
-	d.notify.mu.Lock()
-	defer d.notify.mu.Unlock()
-	if d.notify.write == 0 {
-		return
-	}
 	if _, err := syscall.Write(d.notify.write, oneByte); err != nil && err != syscall.EAGAIN {
 		panic(fmt.Errorf("failed to write to pipe: %v", err))
 	}
@@ -1611,48 +1524,6 @@ func (w *window) onPointerMotion(x, y C.wl_fixed_t, t C.uint32_t) {
 		Time:      time.Duration(t) * time.Millisecond,
 		Modifiers: w.disp.xkb.Modifiers(),
 	})
-	c, _ := w.systemGesture()
-	if c != w.cursor.system {
-		w.cursor.system = c
-		w.updateCursor()
-	}
-}
-
-// updateCursor updates the system gesture cursor according to the pointer
-// position.
-func (w *window) systemGesture() (*C.struct_wl_cursor, C.uint32_t) {
-	if w.config.Mode != Windowed || w.config.Decorated {
-		return nil, 0
-	}
-	border := w.w.w.metric.Dp(3)
-	x, y, size := int(w.lastPos.X), int(w.lastPos.Y), w.config.Size
-	north := y <= border
-	south := y >= size.Y-border
-	west := x <= border
-	east := x >= size.X-border
-
-	switch {
-	default:
-		fallthrough
-	case !north && !south && !west && !east:
-		return nil, 0
-	case north && west:
-		return w.cursor.cursors.resizeNorthWest, C.XDG_TOPLEVEL_RESIZE_EDGE_TOP_LEFT
-	case north && east:
-		return w.cursor.cursors.resizeNorthEast, C.XDG_TOPLEVEL_RESIZE_EDGE_TOP_RIGHT
-	case south && west:
-		return w.cursor.cursors.resizeSouthWest, C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_LEFT
-	case south && east:
-		return w.cursor.cursors.resizeSouthEast, C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM_RIGHT
-	case north:
-		return w.cursor.cursors.resizeNorth, C.XDG_TOPLEVEL_RESIZE_EDGE_TOP
-	case south:
-		return w.cursor.cursors.resizeSouth, C.XDG_TOPLEVEL_RESIZE_EDGE_BOTTOM
-	case west:
-		return w.cursor.cursors.resizeWest, C.XDG_TOPLEVEL_RESIZE_EDGE_LEFT
-	case east:
-		return w.cursor.cursors.resizeEast, C.XDG_TOPLEVEL_RESIZE_EDGE_RIGHT
-	}
 }

 func (w *window) updateOpaqueRegion() {
@@ -1678,7 +1549,6 @@ func (w *window) updateOutputs() {
 	if found && scale != w.scale {
 		w.scale = scale
 		C.wl_surface_set_buffer_scale(w.surf, C.int32_t(w.scale))
-		w.redraw = true
 	}
 	if !found {
 		w.setStage(system.StagePaused)
@@ -1752,16 +1622,21 @@ func (w *window) SetInputHint(_ key.InputHint) {}

 func (w *window) EditorStateChanged(old, new editorState) {}

+// Close the window.
+func (w *window) Close() {
+	w.dead = true
+}
+
 func (w *window) NewContext() (context, error) {
 	var firstErr error
-	if f := newWaylandEGLContext; f != nil {
+	if f := newWaylandVulkanContext; f != nil {
 		c, err := f(w)
 		if err == nil {
 			return c, nil
 		}
 		firstErr = err
 	}
-	if f := newWaylandVulkanContext; f != nil {
+	if f := newWaylandEGLContext; f != nil {
 		c, err := f(w)
 		if err == nil {
 			return c, nil
@@ -1828,12 +1703,10 @@ func newWLDisplay() (*wlDisplay, error) {
 }

 func (d *wlDisplay) destroy() {
-	d.notify.mu.Lock()
 	if d.notify.write != 0 {
 		syscall.Close(d.notify.write)
 		d.notify.write = 0
 	}
-	d.notify.mu.Unlock()
 	if d.notify.read != 0 {
 		syscall.Close(d.notify.read)
 		d.notify.read = 0
@@ -53,11 +53,9 @@ type window struct {
 	placement *windows.WindowPlacement

 	animating bool
-	focused   bool

-	deltas     winDeltas
-	borderSize image.Point
-	config     Config
+	deltas winDeltas
+	config Config
 }

 const _WM_WAKEUP = windows.WM_USER + iota
@@ -152,8 +150,6 @@ func initResources() error {
 	return nil
 }

-const dwExStyle = windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE
-
 func createNativeWindow() (*window, error) {
 	var resErr error
 	resources.once.Do(func() {
@@ -162,10 +158,10 @@ func createNativeWindow() (*window, error) {
 	if resErr != nil {
 		return nil, resErr
 	}
-	const dwStyle = windows.WS_OVERLAPPEDWINDOW
+	dwStyle := uint32(windows.WS_OVERLAPPEDWINDOW)
+	dwExStyle := uint32(windows.WS_EX_APPWINDOW | windows.WS_EX_WINDOWEDGE)

-	hwnd, err := windows.CreateWindowEx(
-		dwExStyle,
+	hwnd, err := windows.CreateWindowEx(dwExStyle,
 		resources.class,
 		"",
 		dwStyle|windows.WS_CLIPSIBLINGS|windows.WS_CLIPCHILDREN,
@@ -192,6 +188,7 @@ func createNativeWindow() (*window, error) {
 // 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),
@@ -199,20 +196,31 @@ func (w *window) update() {
 	}

 	// 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 {
-		size = image.Point{
-			X: int(r.Right - r.Left),
-			Y: int(r.Bottom - r.Top),
-		}
+		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.config.Size = size
-
-	w.borderSize = image.Pt(
-		windows.GetSystemMetrics(windows.SM_CXSIZEFRAME),
-		windows.GetSystemMetrics(windows.SM_CYSIZEFRAME),
-	)
-	w.w.Event(ConfigEvent{Config: w.config})
 }

 func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr {
@@ -278,43 +286,23 @@ func windowProc(hwnd syscall.Handle, msg uint32, wParam, lParam uintptr) uintptr
 			Type: pointer.Cancel,
 		})
 	case windows.WM_SETFOCUS:
-		w.focused = true
 		w.w.Event(key.FocusEvent{Focus: true})
 	case windows.WM_KILLFOCUS:
-		w.focused = false
 		w.w.Event(key.FocusEvent{Focus: false})
-	case windows.WM_NCACTIVATE:
-		if w.stage >= system.StageInactive {
-			if wParam == windows.TRUE {
-				w.setStage(system.StageRunning)
-			} else {
-				w.setStage(system.StageInactive)
-			}
-		}
-	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(),
-			Modifiers: getModifiers(),
+			Type:     pointer.Move,
+			Source:   pointer.Mouse,
+			Position: p,
+			Buttons:  w.pointerBtns,
+			Time:     windows.GetMessageTime(),
 		})
 	case windows.WM_MOUSEWHEEL:
-		w.scrollEvent(wParam, lParam, false, getModifiers())
+		w.scrollEvent(wParam, lParam, false)
 	case windows.WM_MOUSEHWHEEL:
-		w.scrollEvent(wParam, lParam, true, getModifiers())
+		w.scrollEvent(wParam, lParam, true)
 	case windows.WM_DESTROY:
 		w.w.Event(ViewEvent{})
 		w.w.Event(system.DestroyEvent{})
@@ -325,26 +313,15 @@ 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 {
-			// No client areas; we draw decorations ourselves.
-			return 0
-		}
 	case windows.WM_PAINT:
 		w.draw(true)
 	case windows.WM_SIZE:
-		w.update()
 		switch wParam {
 		case windows.SIZE_MINIMIZED:
-			w.config.Mode = Minimized
+			w.update()
 			w.setStage(system.StagePaused)
-		case windows.SIZE_MAXIMIZED:
-			w.config.Mode = Maximized
-			w.setStage(system.StageRunning)
-		case windows.SIZE_RESTORED:
-			if w.config.Mode != Fullscreen {
-				w.config.Mode = Windowed
-			}
+		case windows.SIZE_MAXIMIZED, windows.SIZE_RESTORED:
+			w.update()
 			w.setStage(system.StageRunning)
 		}
 	case windows.WM_GETMINMAXINFO:
@@ -413,12 +390,11 @@ 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)
+			pos := state.RunesIndex(state.UTF16Index(rng.Start) + rel)
+			w.w.SetEditorSelection(key.Range{Start: pos, End: pos})
 		}
-		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})
@@ -445,53 +421,7 @@ 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) {
-	if !w.focused {
-		windows.SetFocus(w.hwnd)
-	}
-
 	var typ pointer.Type
 	if press {
 		typ = pointer.Press
@@ -524,7 +454,7 @@ func coordsFromlParam(lParam uintptr) (int, int) {
 	return x, y
 }

-func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool, kmods key.Modifiers) {
+func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool) {
 	x, y := coordsFromlParam(lParam)
 	// The WM_MOUSEWHEEL coordinates are in screen coordinates, in contrast
 	// to other mouse events.
@@ -536,21 +466,15 @@ func (w *window) scrollEvent(wParam, lParam uintptr, horizontal bool, kmods key.
 	if horizontal {
 		sp.X = dist
 	} else {
-		// support horizontal scroll (shift + mousewheel)
-		if kmods == key.ModShift {
-			sp.X = -dist
-		} else {
-			sp.Y = -dist
-		}
+		sp.Y = -dist
 	}
 	w.w.Event(pointer.Event{
-		Type:      pointer.Scroll,
-		Source:    pointer.Mouse,
-		Position:  p,
-		Buttons:   w.pointerBtns,
-		Scroll:    sp,
-		Modifiers: kmods,
-		Time:      windows.GetMessageTime(),
+		Type:     pointer.Scroll,
+		Source:   pointer.Mouse,
+		Position: p,
+		Buttons:  w.pointerBtns,
+		Scroll:   sp,
+		Time:     windows.GetMessageTime(),
 	})
 }

@@ -663,71 +587,78 @@ func (w *window) readClipboard() error {
 }

 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:
-		style |= winStyle
-		swpStyle |= windows.SWP_NOMOVE | windows.SWP_NOSIZE
-		showMode = windows.SW_SHOWMINIMIZED
+		windows.ShowWindow(w.hwnd, windows.SW_SHOWMINIMIZED)

 	case Maximized:
-		style |= winStyle
-		swpStyle |= windows.SWP_NOMOVE | windows.SWP_NOSIZE
-		showMode = windows.SW_SHOWMAXIMIZED
+		// 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)

 	case Windowed:
 		windows.SetWindowText(w.hwnd, w.config.Title)
-		style |= winStyle
-		showMode = windows.SW_SHOWNORMAL
+		// 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)
+		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
-		// Compute client size and position. Note that the client size is
-		// equal to the window size when we are in control of decorations.
+		// Convert from client size to window size.
 		r := wr
-		if w.config.Decorated {
-			windows.AdjustWindowRectEx(&r, uint32(style), 0, dwExStyle)
-		}
+		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
-		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})
+		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
 		}
+		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)
 		mi := windows.GetMonitorInfo(w.hwnd)
-		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_SHOW
+		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})
 	}
-	windows.SetWindowLong(w.hwnd, windows.GWL_STYLE, style)
-	windows.SetWindowPos(w.hwnd, 0, x, y, width, height, swpStyle)
-	windows.ShowWindow(w.hwnd, showMode)
-
-	w.w.Event(ConfigEvent{Config: w.config})
 }

 func (w *window) WriteClipboard(s string) {
@@ -830,30 +761,13 @@ func (w *window) HWND() (syscall.Handle, int, int) {
 	return w.hwnd, w.config.Size.X, w.config.Size.Y
 }

-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) Close() {
+	windows.PostMessage(w.hwnd, windows.WM_CLOSE, 0, 0)
 }

-func (w *window) raise() {
+func (w *window) Perform(system.Action) {}
+
+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)
@@ -30,6 +30,8 @@ import (
 	"errors"
 	"fmt"
 	"image"
+	"os"
+	"path/filepath"
 	"strconv"
 	"sync"
 	"time"
@@ -170,7 +172,7 @@ func (w *x11Window) Configure(options []Option) {
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			w.raise()
+			w.Raise()
 			fallthrough
 		default:
 			w.config.Mode = Fullscreen
@@ -188,7 +190,7 @@ func (w *x11Window) Configure(options []Option) {
 		switch prev.Mode {
 		case Fullscreen:
 		case Minimized:
-			w.raise()
+			w.Raise()
 			fallthrough
 		default:
 			w.config.Mode = Maximized
@@ -203,7 +205,7 @@ 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)
@@ -228,11 +230,29 @@ 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
 	}
-	w.w.Event(ConfigEvent{Config: w.config})
+	if w.config != prev {
+		w.w.Event(ConfigEvent{Config: w.config})
+	}
 }

 func (w *x11Window) setTitle(prev, cnf Config) {
@@ -253,38 +273,9 @@ func (w *x11Window) setTitle(prev, cnf Config) {
 	}
 }

-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) Perform(system.Action) {}

-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() {
+func (w *x11Window) Raise() {
 	var xev C.XEvent
 	ev := (*C.XClientMessageEvent)(unsafe.Pointer(&xev))
 	*ev = C.XClientMessageEvent{
@@ -330,8 +321,8 @@ 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{
@@ -467,6 +458,7 @@ loop:
 			})
 		}
 	}
+	w.w.Event(system.DestroyEvent{Err: nil})
 }

 func (w *x11Window) destroy() {
@@ -488,6 +480,7 @@ func (w *x11Window) destroy() {

 // 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))
@@ -501,6 +494,7 @@ 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
@@ -508,6 +502,7 @@ type x11EventHandler struct {
 }

 // handleEvents returns true if the window needs to be redrawn.
+//
 func (h *x11EventHandler) handleEvents() bool {
 	w := h.w
 	xev := h.xev
@@ -569,24 +564,16 @@ func (h *x11EventHandler) handleEvents() bool {
 			case C.Button3:
 				btn = pointer.ButtonSecondary
 			case C.Button4:
+				// scroll up
 				ev.Type = pointer.Scroll
-				// scroll up or left (if shift is pressed).
-				if ev.Modifiers == key.ModShift {
-					ev.Scroll.X = -scrollScale
-				} else {
-					ev.Scroll.Y = -scrollScale
-				}
+				ev.Scroll.Y = -scrollScale
 			case C.Button5:
-				// scroll down or right (if shift is pressed).
+				// scroll down
 				ev.Type = pointer.Scroll
-				if ev.Modifiers == key.ModShift {
-					ev.Scroll.X = +scrollScale
-				} else {
-					ev.Scroll.Y = +scrollScale
-				}
+				ev.Scroll.Y = +scrollScale
 			case 6:
 				// http://xahlee.info/linux/linux_x11_mouse_button_number.html
-				// scroll left.
+				// scroll left
 				ev.Type = pointer.Scroll
 				ev.Scroll.X = -scrollScale * 2
 			case 7:
@@ -799,7 +786,7 @@ func newX11Window(gioWin *callbacks, options []Option) error {
 	hints.flags = C.InputHint
 	C.XSetWMHints(dpy, win, &hints)

-	name := C.CString(ID)
+	name := C.CString(filepath.Base(os.Args[0]))
 	defer C.free(unsafe.Pointer(name))
 	wmhints := C.XClassHint{name, name}
 	C.XSetClassHint(dpy, win, &wmhints)
@@ -833,7 +820,6 @@ func newX11Window(gioWin *callbacks, options []Option) error {
 		w.setStage(system.StageRunning)
 		w.loop()
 		w.w.Event(X11ViewEvent{})
-		w.w.Event(system.DestroyEvent{Err: nil})
 		w.destroy()
 	}()
 	return nil
@@ -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.
@@ -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.
@@ -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
@@ -3,10 +3,11 @@
 /*
 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
@@ -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.
@@ -1,13 +0,0 @@
-// 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
@@ -16,7 +16,6 @@ import (
 	"gioui.org/f32"
 	"gioui.org/font/gofont"
 	"gioui.org/gpu"
-	"gioui.org/internal/debug"
 	"gioui.org/internal/ops"
 	"gioui.org/io/event"
 	"gioui.org/io/key"
@@ -26,7 +25,7 @@ import (
 	"gioui.org/io/system"
 	"gioui.org/layout"
 	"gioui.org/op"
-	"gioui.org/text"
+	"gioui.org/op/clip"
 	"gioui.org/unit"
 	"gioui.org/widget"
 	"gioui.org/widget/material"
@@ -56,20 +55,19 @@ type Window struct {
 	immediateRedraws chan struct{}
 	// scheduledRedraws is sent the most recent delayed redraw time.
 	scheduledRedraws chan time.Time
-	// options are the options waiting to be applied.
-	options chan []Option
-	// actions are the actions waiting to be performed.
-	actions chan system.Action

 	out      chan event.Event
 	frames   chan *op.Ops
 	frameAck chan struct{}
-	destroy  chan struct{}
+	closing  bool
+	// dead is closed when the window is destroyed.
+	dead chan struct{}

 	stage        system.Stage
 	animating    bool
 	hasNextFrame bool
 	nextFrame    time.Time
+	delayedDraw  *time.Timer
 	// viewport is the latest frame size with insets applied.
 	viewport image.Rectangle
 	// metric is the metric from the most recent frame.
@@ -79,16 +77,10 @@ type Window struct {
 	cursor      pointer.Cursor
 	decorations struct {
 		op.Ops
-		// enabled tracks the Decorated option as
-		// given to the Option method. It may differ
-		// from Config.Decorated depending on platform
-		// capability.
-		enabled bool
 		Config
-		height        unit.Dp
-		currentHeight int
 		*material.Theme
 		*widget.Decorations
+		size image.Point // decorations size
 	}

 	callbacks callbacks
@@ -127,6 +119,9 @@ type queue struct {
 	q router.Router
 }

+// Pre-allocate the ack event to avoid garbage.
+var ackEvent event.Event
+
 // NewWindow creates a new window for a set of window
 // options. The options are hints; the platform is free to
 // ignore or adjust them.
@@ -138,26 +133,9 @@ type queue struct {
 // Calling NewWindow more than once is not supported on
 // iOS, Android, WebAssembly.
 func NewWindow(options ...Option) *Window {
-	debug.Parse()
-	// Measure decoration height.
-	deco := new(widget.Decorations)
-	theme := material.NewTheme()
-	theme.Shaper = text.NewShaper(text.NoSystemFonts(), text.WithCollection(gofont.Regular()))
-	decoStyle := material.Decorations(theme, deco, 0, "")
-	gtx := layout.Context{
-		Ops: new(op.Ops),
-		// Measure in Dp.
-		Metric: unit.Metric{},
-	}
-	// Allow plenty of space.
-	gtx.Constraints.Max.Y = 200
-	dims := decoStyle.Layout(gtx)
-	decoHeight := unit.Dp(dims.Size.Y)
 	defaultOptions := []Option{
-		Size(800, 600),
+		Size(unit.Dp(800), unit.Dp(600)),
 		Title("Gio"),
-		Decorated(true),
-		decoHeightOpt(decoHeight),
 	}
 	options = append(defaultOptions, options...)
 	var cnf Config
@@ -165,7 +143,7 @@ func NewWindow(options ...Option) *Window {

 	w := &Window{
 		out:              make(chan event.Event),
-		immediateRedraws: make(chan struct{}),
+		immediateRedraws: make(chan struct{}, 0),
 		redraws:          make(chan struct{}, 1),
 		scheduledRedraws: make(chan time.Time, 1),
 		frames:           make(chan *op.Ops),
@@ -173,15 +151,9 @@ func NewWindow(options ...Option) *Window {
 		driverFuncs:      make(chan func(d driver), 1),
 		wakeups:          make(chan struct{}, 1),
 		wakeupFuncs:      make(chan func()),
-		destroy:          make(chan struct{}),
-		options:          make(chan []Option, 1),
-		actions:          make(chan system.Action, 1),
+		dead:             make(chan struct{}),
 		nocontext:        cnf.CustomRenderer,
 	}
-	w.decorations.Theme = theme
-	w.decorations.Decorations = deco
-	w.decorations.enabled = cnf.Decorated
-	w.decorations.height = decoHeight
 	w.imeState.compose = key.Range{Start: -1, End: -1}
 	w.semantic.ids = make(map[router.SemanticID]router.SemanticNode)
 	w.callbacks.w = w
@@ -189,12 +161,6 @@ func NewWindow(options ...Option) *Window {
 	return w
 }

-func decoHeightOpt(h unit.Dp) Option {
-	return func(m unit.Metric, c *Config) {
-		c.decoHeight = h
-	}
-}
-
 // Events returns the channel where events are delivered.
 func (w *Window) Events() <-chan event.Event {
 	return w.out
@@ -208,16 +174,7 @@ func (w *Window) update(frame *op.Ops) {
 	<-w.frameAck
 }

-func (w *Window) validateAndProcess(d driver, size image.Point, sync bool, frame *op.Ops, sigChan chan<- struct{}) error {
-	signal := func() {
-		if sigChan != nil {
-			// We're done with frame, let the client continue.
-			sigChan <- struct{}{}
-			// Signal at most once.
-			sigChan = nil
-		}
-	}
-	defer signal()
+func (w *Window) validateAndProcess(d driver, size image.Point, sync bool, frame *op.Ops) error {
 	for {
 		if w.gpu == nil && !w.nocontext {
 			var err error
@@ -243,24 +200,21 @@ func (w *Window) validateAndProcess(d driver, size image.Point, sync bool, frame
 				return err
 			}
 		}
-		if w.ctx != nil {
+		if w.gpu == nil && !w.nocontext {
 			if err := w.ctx.Lock(); err != nil {
 				w.destroyGPU()
 				return err
 			}
-		}
-		if w.gpu == nil && !w.nocontext {
 			gpu, err := gpu.New(w.ctx.API())
+			w.ctx.Unlock()
 			if err != nil {
-				w.ctx.Unlock()
 				w.destroyGPU()
 				return err
 			}
 			w.gpu = gpu
 		}
 		if w.gpu != nil {
-			if err := w.frame(frame, size); err != nil {
-				w.ctx.Unlock()
+			if err := w.render(frame, size); err != nil {
 				if errors.Is(err, errOutOfDate) {
 					// GPU surface needs refreshing.
 					sync = true
@@ -274,19 +228,15 @@ func (w *Window) validateAndProcess(d driver, size image.Point, sync bool, frame
 			}
 		}
 		w.queue.q.Frame(frame)
-		// Let the client continue as soon as possible, in particular before
-		// a potentially blocking Present.
-		signal()
-		var err error
-		if w.gpu != nil {
-			err = w.ctx.Present()
-			w.ctx.Unlock()
-		}
-		return err
+		return nil
 	}
 }

-func (w *Window) frame(frame *op.Ops, viewport image.Point) error {
+func (w *Window) render(frame *op.Ops, viewport image.Point) error {
+	if err := w.ctx.Lock(); err != nil {
+		return err
+	}
+	defer w.ctx.Unlock()
 	if runtime.GOOS == "js" {
 		// Use transparent black when Gio is embedded, to allow mixing of Gio and
 		// foreign content below.
@@ -298,7 +248,10 @@ func (w *Window) frame(frame *op.Ops, viewport image.Point) error {
 	if err != nil {
 		return err
 	}
-	return w.gpu.Frame(frame, target, viewport)
+	if err := w.gpu.Frame(frame, target, viewport); err != nil {
+		return err
+	}
+	return w.ctx.Present()
 }

 func (w *Window) processFrame(d driver, frameStart time.Time) {
@@ -365,18 +318,18 @@ func (w *Window) Invalidate() {

 // Option applies the options to the window.
 func (w *Window) Option(opts ...Option) {
-	if len(opts) == 0 {
-		return
-	}
-	for {
-		select {
-		case old := <-w.options:
-			opts = append(old, opts...)
-		case w.options <- opts:
-			w.wakeup()
-			return
-		}
-	}
+	w.driverDefer(func(d driver) {
+		d.Configure(opts)
+	})
+}
+
+// ReadClipboard initiates a read of the clipboard in the form
+// of a clipboard.Event. Multiple reads may be coalesced
+// to a single event.
+func (w *Window) ReadClipboard() {
+	w.driverDefer(func(d driver) {
+		d.ReadClipboard()
+	})
 }

 // WriteClipboard writes a string to the clipboard.
@@ -402,7 +355,7 @@ func (w *Window) Run(f func()) {
 	})
 	select {
 	case <-done:
-	case <-w.destroy:
+	case <-w.dead:
 	}
 }

@@ -412,13 +365,13 @@ func (w *Window) driverDefer(f func(d driver)) {
 	select {
 	case w.driverFuncs <- f:
 		w.wakeup()
-	case <-w.destroy:
+	case <-w.dead:
 	}
 }

 func (w *Window) updateAnimation(d driver) {
 	animate := false
-	if w.stage >= system.StageInactive && w.hasNextFrame {
+	if w.stage >= system.StageRunning && w.hasNextFrame {
 		if dt := time.Until(w.nextFrame); dt <= 0 {
 			animate = true
 		} else {
@@ -459,52 +412,29 @@ func (c *callbacks) SetDriver(d driver) {
 	c.w.wakeupFuncs <- wakeup
 }

-func (c *callbacks) Event(e event.Event) bool {
+func (c *callbacks) Event(e event.Event) {
 	if c.d == nil {
 		panic("event while no driver active")
 	}
 	c.waitEvents = append(c.waitEvents, e)
 	if c.busy {
-		return true
+		return
 	}
 	c.busy = true
-	var handled bool
+	defer func() {
+		c.busy = false
+	}()
 	for len(c.waitEvents) > 0 {
 		e := c.waitEvents[0]
 		copy(c.waitEvents, c.waitEvents[1:])
 		c.waitEvents = c.waitEvents[:len(c.waitEvents)-1]
-		handled = c.w.processEvent(c.d, e)
-	}
-	c.busy = false
-	select {
-	case <-c.w.destroy:
-		return handled
-	default:
+		c.w.processEvent(c.d, e)
 	}
 	c.w.updateState(c.d)
-	if _, ok := e.(wakeupEvent); ok {
-		select {
-		case opts := <-c.w.options:
-			cnf := Config{Decorated: c.w.decorations.enabled}
-			for _, opt := range opts {
-				opt(c.w.metric, &cnf)
-			}
-			c.w.decorations.enabled = cnf.Decorated
-			decoHeight := c.w.decorations.height
-			if !c.w.decorations.enabled {
-				decoHeight = 0
-			}
-			opts = append(opts, decoHeightOpt(decoHeight))
-			c.d.Configure(opts)
-		default:
-		}
-		select {
-		case acts := <-c.w.actions:
-			c.d.Perform(acts)
-		default:
-		}
+	if c.w.closing {
+		c.w.closing = false
+		c.d.Close()
 	}
-	return handled
 }

 // SemanticRoot returns the ID of the semantic root.
@@ -572,6 +502,10 @@ func (c *callbacks) SetEditorSnippet(r key.Range) {
 	c.Event(key.SnippetEvent(r))
 }

+func (c *callbacks) MoveFocus(dir router.FocusDirection) {
+	c.w.moveFocus(dir, c.d)
+}
+
 func (w *Window) moveFocus(dir router.FocusDirection, d driver) {
 	if w.queue.q.MoveFocus(dir) {
 		w.queue.q.RevealFocus(w.viewport)
@@ -589,10 +523,12 @@ func (w *Window) moveFocus(dir router.FocusDirection, d driver) {
 		default:
 			return
 		}
-		const scrollABit = unit.Dp(50)
-		dist := v.Mul(int(w.metric.Dp(scrollABit)))
+		const scrollABit = 50
+		dist := v.Mul(w.metric.Px(unit.Dp(scrollABit)))
 		w.queue.q.ScrollFocus(dist)
 	}
+	w.setNextFrame(time.Time{})
+	w.updateAnimation(d)
 }

 func (c *callbacks) ClickFocus() {
@@ -601,10 +537,6 @@ func (c *callbacks) ClickFocus() {
 	c.w.updateAnimation(c.d)
 }

-func (c *callbacks) ActionAt(p f32.Point) (system.Action, bool) {
-	return c.w.queue.q.ActionAt(p)
-}
-
 func (e *editorState) Replace(r key.Range, text string) {
 	if r.Start > r.End {
 		r.Start, r.End = r.End, r.Start
@@ -713,7 +645,7 @@ func (w *Window) waitAck(d driver) {
 		select {
 		case f := <-w.driverFuncs:
 			f(d)
-		case w.out <- event.Event(nil):
+		case w.out <- ackEvent:
 			// A dummy event went through, so we know the application has processed the previous event.
 			return
 		case <-w.immediateRedraws:
@@ -738,19 +670,20 @@ func (w *Window) destroyGPU() {
 }

 // waitFrame waits for the client to either call FrameEvent.Frame
-// or to continue event handling.
-func (w *Window) waitFrame(d driver) *op.Ops {
+// or to continue event handling. It returns whether the client
+// called Frame or not.
+func (w *Window) waitFrame(d driver) (*op.Ops, bool) {
 	for {
 		select {
 		case f := <-w.driverFuncs:
 			f(d)
 		case frame := <-w.frames:
 			// The client called FrameEvent.Frame.
-			return frame
-		case w.out <- event.Event(nil):
+			return frame, true
+		case w.out <- ackEvent:
 			// The client ignored FrameEvent and continued processing
 			// events.
-			return nil
+			return nil, false
 		case <-w.immediateRedraws:
 			// Invalidate was called during frame processing.
 			w.setNextFrame(time.Time{})
@@ -808,15 +741,15 @@ func (w *Window) updateState(d driver) {
 	}
 }

-func (w *Window) processEvent(d driver, e event.Event) bool {
+func (w *Window) processEvent(d driver, e event.Event) {
 	select {
-	case <-w.destroy:
-		return false
+	case <-w.dead:
+		return
 	default:
 	}
 	switch e2 := e.(type) {
 	case system.StageEvent:
-		if e2.Stage < system.StageInactive {
+		if e2.Stage < system.StageRunning {
 			if w.gpu != nil {
 				w.ctx.Lock()
 				w.gpu.Release()
@@ -832,7 +765,7 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 		if e2.Size == (image.Point{}) {
 			panic(errors.New("internal error: zero-sized Draw"))
 		}
-		if w.stage < system.StageInactive {
+		if w.stage < system.StageRunning {
 			// No drawing if not visible.
 			break
 		}
@@ -850,12 +783,12 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 		wrapper.Reset()
 		viewport := image.Rectangle{
 			Min: image.Point{
-				X: e2.Metric.Dp(e2.Insets.Left),
-				Y: e2.Metric.Dp(e2.Insets.Top),
+				X: e2.Metric.Px(e2.Insets.Left),
+				Y: e2.Metric.Px(e2.Insets.Top),
 			},
 			Max: image.Point{
-				X: e2.Size.X - e2.Metric.Dp(e2.Insets.Right),
-				Y: e2.Size.Y - e2.Metric.Dp(e2.Insets.Bottom),
+				X: e2.Size.X - e2.Metric.Px(e2.Insets.Right),
+				Y: e2.Size.Y - e2.Metric.Px(e2.Insets.Bottom),
 			},
 		}
 		// Scroll to focus if viewport is shrinking in any dimension.
@@ -863,86 +796,70 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 			w.queue.q.RevealFocus(viewport)
 		}
 		w.viewport = viewport
-		viewSize := e2.Size
-		m := op.Record(wrapper)
-		size, offset := w.decorate(d, e2.FrameEvent, wrapper)
-		e2.FrameEvent.Size = size
-		deco := m.Stop()
+		size := e2.Size // save the initial window size as the decorations will change it.
+		e2.FrameEvent.Size = w.decorate(d, e2.FrameEvent, wrapper)
 		w.out <- e2.FrameEvent
-		frame := w.waitFrame(d)
-		var signal chan<- struct{}
-		if frame != nil {
-			signal = w.frameAck
-			off := op.Offset(offset).Push(wrapper)
-			ops.AddCall(&wrapper.Internal, &frame.Internal, ops.PC{}, ops.PCFor(&frame.Internal))
-			off.Pop()
+		frame, gotFrame := w.waitFrame(d)
+		cl := clip.Rect(image.Rectangle{Max: e2.FrameEvent.Size}).Push(wrapper)
+		ops.AddCall(&wrapper.Internal, &frame.Internal, ops.PC{}, ops.PCFor(&frame.Internal))
+		cl.Pop()
+		err := w.validateAndProcess(d, size, e2.Sync, wrapper)
+		if gotFrame {
+			// We're done with frame, let the client continue.
+			w.frameAck <- struct{}{}
 		}
-		deco.Add(wrapper)
-		if err := w.validateAndProcess(d, viewSize, e2.Sync, wrapper, signal); err != nil {
+		if err != nil {
 			w.destroyGPU()
 			w.out <- system.DestroyEvent{Err: err}
+			close(w.dead)
 			close(w.out)
-			close(w.destroy)
 			break
 		}
 		w.processFrame(d, frameStart)
 		w.updateCursor(d)
+	case *system.CommandEvent:
+		w.out <- e
+		w.waitAck(d)
 	case system.DestroyEvent:
 		w.destroyGPU()
 		w.out <- e2
+		close(w.dead)
 		close(w.out)
-		close(w.destroy)
 	case ViewEvent:
 		w.out <- e2
 		w.waitAck(d)
+	case wakeupEvent:
 	case ConfigEvent:
 		w.decorations.Config = e2.Config
-		e2.Config = w.effectiveConfig()
+		if !w.fallbackDecorate() {
+			// Decorations are no longer applied.
+			w.decorations.Decorations = nil
+			w.decorations.size = image.Point{}
+		}
+		e2.Config.Size = e2.Config.Size.Sub(w.decorations.size)
 		w.out <- e2
 	case event.Event:
-		handled := w.queue.q.Queue(e2)
-		if e, ok := e.(key.Event); ok && !handled {
-			if e.State == key.Press {
-				handled = true
-				isMobile := runtime.GOOS == "ios" || runtime.GOOS == "android"
-				switch {
-				case e.Name == key.NameTab && e.Modifiers == 0:
-					w.moveFocus(router.FocusForward, d)
-				case e.Name == key.NameTab && e.Modifiers == key.ModShift:
-					w.moveFocus(router.FocusBackward, d)
-				case e.Name == key.NameUpArrow && e.Modifiers == 0 && isMobile:
-					w.moveFocus(router.FocusUp, d)
-				case e.Name == key.NameDownArrow && e.Modifiers == 0 && isMobile:
-					w.moveFocus(router.FocusDown, d)
-				case e.Name == key.NameLeftArrow && e.Modifiers == 0 && isMobile:
-					w.moveFocus(router.FocusLeft, d)
-				case e.Name == key.NameRightArrow && e.Modifiers == 0 && isMobile:
-					w.moveFocus(router.FocusRight, d)
-				default:
-					handled = false
-				}
+		// Convert tab or shift+tab presses to focus moves.
+		if e, ok := e.(key.Event); ok && e.State == key.Press && e.Name == key.NameTab && e.Modifiers&^key.ModShift == 0 {
+			dir := router.FocusForward
+			if e.Modifiers.Contain(key.ModShift) {
+				dir = router.FocusBackward
 			}
-			// As a special case, the top-most input handler receives all unhandled
-			// events.
-			if !handled {
-				handled = w.queue.q.QueueTopmost(e)
-			}
-		}
-		w.updateCursor(d)
-		if handled {
+			w.moveFocus(dir, d)
+		} else if w.queue.q.Queue(e2) {
 			w.setNextFrame(time.Time{})
 			w.updateAnimation(d)
 		}
-		return handled
+		w.updateCursor(d)
+		w.out <- e
 	}
-	return true
 }

 func (w *Window) run(options []Option) {
 	if err := newWindow(&w.callbacks, options); err != nil {
 		w.out <- system.DestroyEvent{Err: err}
+		close(w.dead)
 		close(w.out)
-		close(w.destroy)
 		return
 	}
 	var wakeup func()
@@ -964,7 +881,7 @@ func (w *Window) run(options []Option) {
 				timer.Stop()
 			}
 			timer = time.NewTimer(time.Until(t))
-		case <-w.destroy:
+		case <-w.dead:
 			return
 		case <-timeC:
 			select {
@@ -988,18 +905,31 @@ func (w *Window) updateCursor(d driver) {

 func (w *Window) fallbackDecorate() bool {
 	cnf := w.decorations.Config
-	return w.decorations.enabled && !cnf.Decorated && cnf.Mode != Fullscreen && !w.nocontext
+	return !cnf.Decorated && cnf.Mode != Fullscreen && !w.nocontext
 }

 // decorate the window if enabled and returns the corresponding Insets.
-func (w *Window) decorate(d driver, e system.FrameEvent, o *op.Ops) (size, offset image.Point) {
+func (w *Window) decorate(d driver, e system.FrameEvent, o *op.Ops) image.Point {
 	if !w.fallbackDecorate() {
-		return e.Size, image.Pt(0, 0)
+		return e.Size
+	}
+	theme := w.decorations.Theme
+	if theme == nil {
+		theme = material.NewTheme(gofont.Collection())
+		w.decorations.Theme = theme
 	}
 	deco := w.decorations.Decorations
+	if deco == nil {
+		deco = new(widget.Decorations)
+		w.decorations.Decorations = deco
+	}
 	allActions := system.ActionMinimize | system.ActionMaximize | system.ActionUnmaximize |
-		system.ActionClose | system.ActionMove
-	style := material.Decorations(w.decorations.Theme, deco, allActions, w.decorations.Config.Title)
+		system.ActionClose | system.ActionMove |
+		system.ActionResizeNorth | system.ActionResizeSouth |
+		system.ActionResizeWest | system.ActionResizeEast |
+		system.ActionResizeNorthWest | system.ActionResizeSouthWest |
+		system.ActionResizeNorthEast | system.ActionResizeSouthEast
+	style := material.Decorations(theme, deco, allActions, w.decorations.Config.Title)
 	// Update the decorations based on the current window mode.
 	var actions system.Action
 	switch m := w.decorations.Config.Mode; m {
@@ -1022,53 +952,54 @@ func (w *Window) decorate(d driver, e system.FrameEvent, o *op.Ops) (size, offse
 		Metric:      e.Metric,
 		Constraints: layout.Exact(e.Size),
 	}
-	style.Layout(gtx)
+	dims := style.Layout(gtx)
 	// Update the window based on the actions on the decorations.
 	w.Perform(deco.Actions())
 	// Offset to place the frame content below the decorations.
-	decoHeight := gtx.Dp(w.decorations.Config.decoHeight)
-	if w.decorations.currentHeight != decoHeight {
-		w.decorations.currentHeight = decoHeight
-		w.out <- ConfigEvent{Config: w.effectiveConfig()}
+	size := image.Point{Y: dims.Size.Y}
+	op.Offset(f32.Point{Y: float32(size.Y)}).Add(o)
+	appSize := e.Size.Sub(size)
+	if w.decorations.size != size {
+		w.decorations.size = size
+		cnf := w.decorations.Config
+		cnf.Size = appSize
+		w.out <- ConfigEvent{Config: cnf}
 	}
-	e.Size.Y -= w.decorations.currentHeight
-	return e.Size, image.Pt(0, decoHeight)
-}
-
-func (w *Window) effectiveConfig() Config {
-	cnf := w.decorations.Config
-	cnf.Size.Y -= w.decorations.currentHeight
-	cnf.Decorated = w.decorations.enabled || cnf.Decorated
-	return cnf
+	return appSize
 }

 // Perform the actions on the window.
 func (w *Window) Perform(actions system.Action) {
-	walkActions(actions, func(action system.Action) {
-		switch action {
-		case system.ActionMinimize:
-			w.Option(Minimized.Option())
-		case system.ActionMaximize:
-			w.Option(Maximized.Option())
-		case system.ActionUnmaximize:
-			w.Option(Windowed.Option())
-		default:
-			return
+	w.driverDefer(func(d driver) {
+		var options []Option
+		walkActions(actions, func(action system.Action) {
+			switch action {
+			case system.ActionMinimize:
+				options = append(options, Minimized.Option())
+			case system.ActionMaximize:
+				options = append(options, Maximized.Option())
+			case system.ActionUnmaximize:
+				options = append(options, Windowed.Option())
+			case system.ActionRaise:
+				d.Raise()
+			case system.ActionCenter:
+				options = append(options,
+					func(m unit.Metric, cnf *Config) {
+						// Set the flag so the driver can later do the actual centering.
+						cnf.center = true
+					})
+			case system.ActionClose:
+				w.closing = true
+			default:
+				return
+			}
+			actions &^= action
+		})
+		if len(options) > 0 {
+			d.Configure(options)
 		}
-		actions &^= action
+		d.Perform(actions)
 	})
-	if actions == 0 {
-		return
-	}
-	for {
-		select {
-		case old := <-w.actions:
-			actions |= old
-		case w.actions <- actions:
-			w.wakeup()
-			return
-		}
-	}
 }

 func (q *queue) Events(k event.Tag) []event.Event {
@@ -1083,50 +1014,50 @@ func Title(t string) Option {
 }

 // Size sets the size of the window. The mode will be changed to Windowed.
-func Size(w, h unit.Dp) Option {
-	if w <= 0 {
+func Size(w, h unit.Value) Option {
+	if w.V <= 0 {
 		panic("width must be larger than or equal to 0")
 	}
-	if h <= 0 {
+	if h.V <= 0 {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(m unit.Metric, cnf *Config) {
 		cnf.Mode = Windowed
 		cnf.Size = image.Point{
-			X: m.Dp(w),
-			Y: m.Dp(h),
+			X: m.Px(w),
+			Y: m.Px(h),
 		}
 	}
 }

 // MaxSize sets the maximum size of the window.
-func MaxSize(w, h unit.Dp) Option {
-	if w <= 0 {
+func MaxSize(w, h unit.Value) Option {
+	if w.V <= 0 {
 		panic("width must be larger than or equal to 0")
 	}
-	if h <= 0 {
+	if h.V <= 0 {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(m unit.Metric, cnf *Config) {
 		cnf.MaxSize = image.Point{
-			X: m.Dp(w),
-			Y: m.Dp(h),
+			X: m.Px(w),
+			Y: m.Px(h),
 		}
 	}
 }

 // MinSize sets the minimum size of the window.
-func MinSize(w, h unit.Dp) Option {
-	if w <= 0 {
+func MinSize(w, h unit.Value) Option {
+	if w.V <= 0 {
 		panic("width must be larger than or equal to 0")
 	}
-	if h <= 0 {
+	if h.V <= 0 {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(m unit.Metric, cnf *Config) {
 		cnf.MinSize = image.Point{
-			X: m.Dp(w),
-			Y: m.Dp(h),
+			X: m.Px(w),
+			Y: m.Px(h),
 		}
 	}
 }
@@ -0,0 +1,14 @@
+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
+)
@@ -0,0 +1,475 @@
+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=
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@@ -0,0 +1,143 @@
+// 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()
+}
@@ -0,0 +1,156 @@
+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)
+}
@@ -0,0 +1,32 @@
+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)
+		}
+	}
+}
@@ -0,0 +1,10 @@
+// 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
@@ -0,0 +1,331 @@
+// 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)
+	}
+}
@@ -0,0 +1,69 @@
+// 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.
+`
@@ -0,0 +1,589 @@
+// 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()
+}
@@ -0,0 +1,123 @@
+// 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()
+}
@@ -0,0 +1,201 @@
+// 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);
+    });
+})();`
+)
@@ -0,0 +1,224 @@
+// 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
+}
@@ -0,0 +1,17 @@
+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())
+}
@@ -0,0 +1,33 @@
+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"`,
+	},
+}
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+//go:build race
+// +build race
+
+package main_test
+
+func init() { raceEnabled = true }
@@ -0,0 +1,142 @@
+// 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}
+}
@@ -0,0 +1,196 @@
+// 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()
+}
@@ -0,0 +1,152 @@
+// 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
+}
@@ -0,0 +1,416 @@
+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.
+}
@@ -0,0 +1,170 @@
+// 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()
+}
@@ -3,11 +3,11 @@
 package f32

 import (
+	"fmt"
 	"math"
-	"strconv"
 )

-// Affine2D represents an affine 2D transformation. The zero value of Affine2D
+// Affine2D represents an affine 2D transformation. The zero value if Affine2D
 // represents the identity transform.
 type Affine2D struct {
 	// in order to make the zero value of Affine2D represent the identity
@@ -112,15 +112,6 @@ 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,
@@ -148,25 +139,5 @@ func (a Affine2D) shear(radiansX, radiansY float32) Affine2D {

 func (a Affine2D) String() string {
 	sx, hx, ox, hy, sy, oy := a.Elems()
-
-	// 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)
+	return fmt.Sprintf("[[%f %f %f] [%f %f %f]]", sx, hx, ox, hy, sy, oy)
 }
@@ -37,29 +37,6 @@ 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}
@@ -2,7 +2,7 @@

 /*
 Package f32 is a float32 implementation of package image's
-Point and affine transformations.
+Point and Rectangle.

 The coordinate space has the origin in the top left
 corner with the axes extending right and down.
@@ -26,6 +26,30 @@ 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}
@@ -51,10 +75,122 @@ func (p Point) Div(s float32) Point {
 	return Point{X: p.X / s, Y: p.Y / s}
 }

-// 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))),
+// 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},
 	}
 }
+
+// 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)))
+}
@@ -3,17 +3,17 @@
    "android": {
      "inputs": {
        "devshell": "devshell",
-        "flake-utils": "flake-utils",
+        "flake-utils": "flake-utils_2",
        "nixpkgs": [
          "nixpkgs"
        ]
      },
      "locked": {
-        "lastModified": 1659298920,
-        "narHash": "sha256-LgRMge8BZUG15EN43iDJOlnEMX1dvRprB7SaoNqgibU=",
+        "lastModified": 1648412532,
+        "narHash": "sha256-zh0rLcppJ5i2Bh8oBWjBhDvgOrMhDGdXINbp3bhrs0U=",
        "owner": "tadfisher",
        "repo": "android-nixpkgs",
-        "rev": "d4f20a3cd4ce961bb23b48447457f6810d69ae5e",
+        "rev": "b1318b23926260685dbb09dd127f38c917fc7441",
        "type": "github"
      },
      "original": {
@@ -24,21 +24,15 @@
    },
    "devshell": {
      "inputs": {
-        "flake-utils": [
-          "android",
-          "nixpkgs"
-        ],
-        "nixpkgs": [
-          "android",
-          "nixpkgs"
-        ]
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
      },
      "locked": {
-        "lastModified": 1658746384,
-        "narHash": "sha256-CCJcoMOcXyZFrV1ag4XMTpAPjLWb4Anbv+ktXFI1ry0=",
+        "lastModified": 1647857022,
+        "narHash": "sha256-Aw70NWLOIwKhT60MHDGjgWis3DP3faCzr6ap9CSayek=",
        "owner": "numtide",
        "repo": "devshell",
-        "rev": "0ffc7937bb5e8141af03d462b468bd071eb18e1b",
+        "rev": "0a5ff74dacb9ea22614f64e61aeb3ca0bf0e7311",
        "type": "github"
      },
      "original": {
@@ -49,11 +43,26 @@
    },
    "flake-utils": {
      "locked": {
-        "lastModified": 1656928814,
-        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "lastModified": 1642700792,
+        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
        "owner": "numtide",
        "repo": "flake-utils",
-        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1648297722,
+        "narHash": "sha256-W+qlPsiZd8F3XkzXOzAoR+mpFqzm3ekQkJNa+PIh1BQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "0f8662f1319ad6abf89b3380dd2722369fc51ade",
        "type": "github"
      },
      "original": {
@@ -64,11 +73,27 @@
    },
    "nixpkgs": {
      "locked": {
-        "lastModified": 1659305579,
-        "narHash": "sha256-SFeQTmh7hc9Y2fSkooHaoS8mDfPa04sfmUCtQ8MA6Pg=",
+        "lastModified": 1643381941,
+        "narHash": "sha256-pHTwvnN4tTsEKkWlXQ8JMY423epos8wUOhthpwJjtpc=",
        "owner": "NixOS",
        "repo": "nixpkgs",
-        "rev": "5857574d45925585baffde730369414319228a84",
+        "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",
        "type": "github"
      },
      "original": {
@@ -80,7 +105,7 @@
    "root": {
      "inputs": {
        "android": "android",
-        "nixpkgs": "nixpkgs"
+        "nixpkgs": "nixpkgs_2"
      }
    }
  },
@@ -47,12 +47,6 @@
                  xorg.libXfixes
                  libGL
                  pkgconfig
-                ] 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";
@@ -1,126 +0,0 @@
-/*
-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")
-	}
-}
@@ -24,49 +24,29 @@ 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 []font.FontFace
+	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()
+func Collection() []text.FontFace {
 	once.Do(func() {
-		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)
+		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)
 		// Ensure that any outside appends will not reuse the backing store.
 		n := len(collection)
 		collection = collection[:n:n]
@@ -74,10 +54,11 @@ func Collection() []font.FontFace {
 	return collection
 }

-func register(ttf []byte) {
-	faces, err := opentype.ParseCollection(ttf)
+func register(fnt text.Font, ttf []byte) {
+	face, err := opentype.Parse(ttf)
 	if err != nil {
 		panic(fmt.Errorf("failed to parse font: %v", err))
 	}
-	collection = append(collection, faces[0])
+	fnt.Typeface = "Go"
+	collection = append(collection, text.FontFace{Font: fnt, Face: face})
 }
@@ -0,0 +1,530 @@
+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
+}
@@ -2,191 +2,137 @@

 // 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/png"
+	"image"
+	"io"

-	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"
+	"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"
 )

-// 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
+// Font implements the text.Shaper interface using a rich text
+// shaping engine.
+type Font struct {
+	font *truetype.Font
 }

-// Parse constructs a Face from source bytes.
-func Parse(src []byte) (Face, error) {
-	ld, err := loader.NewLoader(bytes.NewReader(src))
+// Parse constructs a Font from source bytes.
+func Parse(src []byte) (*Font, error) {
+	face, err := truetype.Parse(bytes.NewReader(src))
 	if err != nil {
-		return Face{}, err
+		return nil, fmt.Errorf("failed parsing truetype font: %w", err)
 	}
-	font, md, err := parseLoader(ld)
-	if err != nil {
-		return Face{}, fmt.Errorf("failed parsing truetype font: %w", err)
-	}
-	return Face{
-		face: font,
-		font: md,
+	return &Font{
+		font: face,
 	}, nil
 }

-// 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)
+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
 		}
-		ff := Face{
-			face: face,
-			font: md,
+		// Move to glyph position.
+		pos := f32.Point{
+			X: float32(x)/64 - float32(g.XOffset)/64,
+			Y: -float32(g.YOffset) / 64,
 		}
-		out[i] = giofont.FontFace{
-			Face: ff,
-			Font: ff.Font(),
+		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++
 	}
-
-	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()
 }
@@ -0,0 +1,151 @@
+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
+}
@@ -91,7 +91,7 @@ type Click struct {
 // TypeClick for a completed click.
 type ClickEvent struct {
 	Type      ClickType
-	Position  image.Point
+	Position  f32.Point
 	Source    pointer.Source
 	Modifiers key.Modifiers
 	// NumClicks records successive clicks occurring
@@ -157,7 +157,7 @@ const (
 	StateFlinging
 )

-const touchSlop = unit.Dp(3)
+var touchSlop = unit.Dp(3)

 // Add the handler to the operation list to receive click events.
 func (c *Click) Add(ops *op.Ops) {
@@ -192,7 +192,13 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 			}
 			c.pressed = false
 			if !c.entered || c.hovered {
-				events = append(events, ClickEvent{Type: TypeClick, Position: e.Position.Round(), Source: e.Source, Modifiers: e.Modifiers, NumClicks: c.clicks})
+				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})
 			} else {
 				events = append(events, ClickEvent{Type: TypeCancel})
 			}
@@ -218,13 +224,7 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 				break
 			}
 			c.pressed = true
-			if e.Time-c.clickedAt < doubleClickDuration {
-				c.clicks++
-			} else {
-				c.clicks = 1
-			}
-			c.clickedAt = e.Time
-			events = append(events, ClickEvent{Type: TypePress, Position: e.Position.Round(), Source: e.Source, Modifiers: e.Modifiers, NumClicks: c.clicks})
+			events = append(events, ClickEvent{Type: TypePress, Position: e.Position, Source: e.Source, Modifiers: e.Modifiers})
 		case pointer.Leave:
 			if !c.pressed {
 				c.pid = e.PointerID
@@ -303,7 +303,7 @@ 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.Dp(touchSlop)), fling.Distance; d < -slop || d > slop {
+			if slop, d := float32(cfg.Px(touchSlop)), fling.Distance; d < -slop || d > slop {
 				s.flinger.Start(cfg, t, fling.Velocity)
 			}
 			fallthrough
@@ -329,7 +329,7 @@ func (s *Scroll) Scroll(cfg unit.Metric, q event.Queue, t time.Time, axis Axis)
 			v := int(math.Round(float64(val)))
 			dist := s.last - v
 			if e.Priority < pointer.Grabbed {
-				slop := cfg.Dp(touchSlop)
+				slop := cfg.Px(touchSlop)
 				if dist := dist; dist >= slop || -slop >= dist {
 					s.grab = true
 				}
@@ -407,7 +407,7 @@ 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.Dp(touchSlop)
+				slop := cfg.Px(touchSlop)
 				if diff.X*diff.X+diff.Y*diff.Y > float32(slop*slop) {
 					d.grab = true
 				}
@@ -98,10 +98,9 @@ func mouseClickEvents(times ...time.Duration) []event.Event {
 	}
 	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
 		events = append(events, press, release)
 	}
 	return events
@@ -1,16 +1,20 @@
 module gioui.org

-go 1.19
+go 1.17

 require (
-	eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d
-	gioui.org/cpu v0.0.0-20210817075930-8d6a761490d2
-	gioui.org/shader v1.0.6
-	github.com/go-text/typesetting v0.0.0-20230803102845-24e03d8b5372
-	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 v0.0.0-20220825204002-c680a09ffe64
+	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 golang.org/x/text v0.7.0
+require (
+	eliasnaur.com/font v0.0.0-20220124212145-832bb8fc08c3
+	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
+)
+
+require golang.org/x/text v0.3.6 // indirect
@@ -1,43 +1,453 @@
-eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d h1:ARo7NCVvN2NdhLlJE9xAbKweuI9L6UgfTbYb0YwPacY=
-eliasnaur.com/font v0.0.0-20230308162249-dd43949cb42d/go.mod h1:OYVuxibdk9OSLX8vAqydtRPP87PyTFcT9uH3MlEGBQA=
+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=
 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/go-text/typesetting v0.0.0-20230803102845-24e03d8b5372 h1:FQivqchis6bE2/9uF70M2gmmLpe82esEm2QadL0TEJo=
-github.com/go-text/typesetting v0.0.0-20230803102845-24e03d8b5372/go.mod h1:evDBbvNR/KaVFZ2ZlDSOWWXIUKq0wCOEtzLxRM8SG3k=
-github.com/go-text/typesetting-utils v0.0.0-20230616150549-2a7df14b6a22 h1:LBQTFxP2MfsyEDqSKmUBZaDuDHN1vpqDyOZjcqS7MYI=
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+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
+gopkg.in/gcfg.v1 v1.2.3/go.mod h1:yesOnuUOFQAhST5vPY4nbZsb/huCgGGXlipJsBn0b3o=
+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=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+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=
@@ -5,16 +5,12 @@ package gpu
 import (
 	"fmt"

-	"gioui.org/internal/f32"
+	"gioui.org/f32"
 )

 type resourceCache struct {
-	res map[interface{}]resourceCacheValue
-}
-
-type resourceCacheValue struct {
-	used     bool
-	resource resource
+	res    map[interface{}]resource
+	newRes map[interface{}]resource
 }

 // opCache is like a resourceCache but using concrete types and a
@@ -39,48 +35,46 @@ type opCacheValue struct {

 func newResourceCache() *resourceCache {
 	return &resourceCache{
-		res: make(map[interface{}]resourceCacheValue),
+		res:    make(map[interface{}]resource),
+		newRes: make(map[interface{}]resource),
 	}
 }

 func (r *resourceCache) get(key interface{}) (resource, bool) {
 	v, exists := r.res[key]
-	if !exists {
-		return nil, false
+	if exists {
+		r.newRes[key] = v
 	}
-	if !v.used {
-		v.used = true
-		r.res[key] = v
-	}
-	return v.resource, exists
+	return v, exists
 }

 func (r *resourceCache) put(key interface{}, val resource) {
-	v, exists := r.res[key]
-	if exists && v.used {
+	if _, exists := r.newRes[key]; exists {
 		panic(fmt.Errorf("key exists, %p", key))
 	}
-	v.used = true
-	v.resource = val
-	r.res[key] = v
+	r.res[key] = val
+	r.newRes[key] = val
 }

 func (r *resourceCache) frame() {
 	for k, v := range r.res {
-		if v.used {
-			v.used = false
-			r.res[k] = v
-		} else {
+		if _, exists := r.newRes[k]; !exists {
 			delete(r.res, k)
-			v.resource.release()
+			v.release()
 		}
 	}
+	for k, v := range r.newRes {
+		delete(r.newRes, k)
+		r.res[k] = v
+	}
 }

 func (r *resourceCache) release() {
+	r.frame()
 	for _, v := range r.res {
-		v.resource.release()
+		v.release()
 	}
+	r.newRes = nil
 	r.res = nil
 }

@@ -1,24 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-package gpu
-
-import "testing"
-
-func BenchmarkResourceCache(b *testing.B) {
-	offset := 0
-	const N = 100
-
-	cache := newResourceCache()
-	for i := 0; i < b.N; i++ {
-		// half are the same and half updated
-		for k := 0; k < N; k++ {
-			cache.put(offset+k, nullResource{})
-		}
-		cache.frame()
-		offset += N / 2
-	}
-}
-
-type nullResource struct{}
-
-func (nullResource) release() {}
@@ -1,10 +1,7 @@
 package gpu

 import (
-	"encoding/binary"
-	"math"
-
-	"gioui.org/internal/f32"
+	"gioui.org/f32"
 	"gioui.org/internal/stroke"
 )

@@ -12,48 +9,19 @@ 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) {
-	// 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))
+	// 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)
 }

-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 {
@@ -1,21 +0,0 @@
-// 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},
-		)
-	}
-}
@@ -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"
@@ -265,6 +265,7 @@ type clipState struct {
 	path      []byte
 	pathKey   ops.Key
 	intersect f32.Rectangle
+	push      bool

 	clipKey
 }
@@ -307,6 +308,11 @@ 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
@@ -404,6 +410,12 @@ 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
@@ -425,13 +437,6 @@ 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)
@@ -655,7 +660,7 @@ func (g *compute) dumpAtlases() {
 		if err := png.Encode(&buf, nrgba); err != nil {
 			panic(err)
 		}
-		if err := os.WriteFile(fmt.Sprintf("dump-%d.png", i), buf.Bytes(), 0600); err != nil {
+		if err := ioutil.WriteFile(fmt.Sprintf("dump-%d.png", i), buf.Bytes(), 0600); err != nil {
 			panic(err)
 		}
 	}
@@ -850,7 +855,7 @@ 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 := f32.FRect(l.rect)
+		r := layout.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},
@@ -1607,6 +1612,13 @@ 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++
@@ -1654,6 +1666,11 @@ 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
@@ -1765,7 +1782,7 @@ func (c *collector) collect(root *op.Ops, viewport image.Point, texOps *[]textur
 		case ops.TypeClip:
 			var op ops.ClipOp
 			op.Decode(encOp.Data)
-			bounds := f32.FRect(op.Bounds)
+			bounds := layout.FRect(op.Bounds)
 			c.addClip(&state, fview, bounds, pathData.data, pathData.key, pathData.hash, strWidth, true)
 			pathData.data = nil
 			strWidth = 0
@@ -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"
@@ -186,7 +186,6 @@ func decodeImageOp(data []byte, refs []interface{}) imageOpData {
 }

 func decodeColorOp(data []byte) color.NRGBA {
-	data = data[:ops.TypeColorLen]
 	return color.NRGBA{
 		R: data[1],
 		G: data[2],
@@ -196,7 +195,6 @@ func decodeColorOp(data []byte) color.NRGBA {
 }

 func decodeLinearGradientOp(data []byte) linearGradientOpData {
-	data = data[:ops.TypeLinearGradientLen]
 	bo := binary.LittleEndian
 	return linearGradientOpData{
 		stop1: f32.Point{
@@ -436,7 +434,7 @@ func (r *renderer) texHandle(cache *resourceCache, data imageOpData) driver.Text
 	if tex.tex != nil {
 		return tex.tex
 	}
-	handle, err := r.ctx.NewTexture(driver.TextureFormatSRGBA, data.src.Bounds().Dx(), data.src.Bounds().Dy(), driver.FilterLinearMipmapLinear, driver.FilterLinear, driver.BufferBindingTexture)
+	handle, err := r.ctx.NewTexture(driver.TextureFormatSRGBA, data.src.Bounds().Dx(), data.src.Bounds().Dy(), driver.FilterLinear, driver.FilterLinear, driver.BufferBindingTexture)
 	if err != nil {
 		panic(err)
 	}
@@ -697,8 +695,8 @@ 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(f32.FRect(uv), fbo.size)
-	subScale, subOff := texSpaceTransform(f32.FRect(sub), p.clip.Size())
+	coverScale, coverOff := texSpaceTransform(layout.FRect(uv), fbo.size)
+	subScale, subOff := texSpaceTransform(layout.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)
@@ -823,6 +821,15 @@ 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)...)
@@ -881,8 +888,8 @@ loop:
 			var op ops.ClipOp
 			op.Decode(encOp.Data)
 			quads.key.outline = op.Outline
-			bounds := f32.FRect(op.Bounds)
-			trans, off := state.t.Split()
+			bounds := layout.FRect(op.Bounds)
+			trans, off := splitTransform(state.t)
 			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
@@ -928,7 +935,7 @@ 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 := state.t.Split()
+			t, off := splitTransform(state.t)
 			// Fill the clip area, unless the material is a (bounded) image.
 			// TODO: Find a tighter bound.
 			inf := float32(1e6)
@@ -1101,7 +1108,7 @@ func (r *renderer) drawOps(cache *resourceCache, ops []imageOp) {
 			Min: img.place.Pos,
 			Max: img.place.Pos.Add(drc.Size()),
 		}
-		coverScale, coverOff := texSpaceTransform(f32.FRect(uv), fbo.size)
+		coverScale, coverOff := texSpaceTransform(layout.FRect(uv), fbo.size)
 		p := r.pather.coverer.pipelines[m.material]
 		r.ctx.BindPipeline(p.pipeline)
 		r.ctx.BindVertexBuffer(r.blitter.quadVerts, 0)
@@ -1327,9 +1334,7 @@ func decodeToOutlineQuads(qs *quadSplitter, tr f32.Affine2D, pathData []byte) {
 			q = q.Transform(tr)
 			qs.splitAndEncode(q)
 		case scene.OpCubic:
-			from, ctrl0, ctrl1, to := scene.DecodeCubic(cmd)
-			qs.scratch = stroke.SplitCubic(from, ctrl0, ctrl1, to, qs.scratch[:0])
-			for _, q := range qs.scratch {
+			for _, q := range stroke.SplitCubic(scene.DecodeCubic(cmd)) {
 				q = q.Transform(tr)
 				qs.splitAndEncode(q)
 			}
@@ -8,7 +8,7 @@ import (
 	"image"
 	"image/color"
 	"image/png"
-	"os"
+	"io/ioutil"
 	"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: 0xbb, B: 0xbe, A: 0xca}
+		col2 = color.NRGBA{R: 0xfe, G: 0xba, 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 os.WriteFile(file, buf.Bytes(), 0666)
+	return ioutil.WriteFile(file, buf.Bytes(), 0666)
 }
@@ -80,7 +80,7 @@ func NewWindow(width, height int) (*Window, error) {
 		)
 		if err != nil {
 			dev.Release()
-			return err
+			return nil
 		}
 		// Note that the gpu takes ownership of dev.
 		gp, err := gpu.NewWithDevice(dev)
@@ -10,10 +10,10 @@ import (
 )

 /*
-#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fobjc-arc -x objective-c
-#cgo LDFLAGS: -framework CoreGraphics -framework Metal -framework Foundation
+#cgo CFLAGS: -Werror -Wno-deprecated-declarations -fmodules -fobjc-arc -x objective-c
+#cgo LDFLAGS: -framework CoreGraphics

-#import <Metal/Metal.h>
+@import Metal;

 static CFTypeRef createDevice(void) {
 	@autoreleasepool {
@@ -10,7 +10,7 @@ import (
 )

 func init() {
-	newContextPrimary = func() (context, error) {
+	newContextFallback = func() (context, error) {
 		return egl.NewContext(egl.EGL_DEFAULT_DISPLAY)
 	}
 }
@@ -7,6 +7,7 @@ import (
 	"image/color"
 	"testing"

+	"gioui.org/f32"
 	"gioui.org/internal/f32color"
 	"gioui.org/op"
 	"gioui.org/op/clip"
@@ -49,14 +50,20 @@ func TestClipping(t *testing.T) {
 	var ops op.Ops
 	paint.ColorOp{Color: col}.Add(&ops)
 	clip.RRect{
-		Rect: image.Rect(50, 50, 250, 250),
-		SE:   75,
+		Rect: f32.Rectangle{
+			Min: f32.Point{X: 50, Y: 50},
+			Max: f32.Point{X: 250, Y: 250},
+		},
+		SE: 75,
 	}.Push(&ops)
 	paint.PaintOp{}.Add(&ops)
 	paint.ColorOp{Color: col2}.Add(&ops)
 	clip.RRect{
-		Rect: image.Rect(100, 100, 350, 350),
-		NW:   75,
+		Rect: f32.Rectangle{
+			Min: f32.Point{X: 100, Y: 100},
+			Max: f32.Point{X: 350, Y: 350},
+		},
+		NW: 75,
 	}.Push(&ops)
 	paint.PaintOp{}.Add(&ops)
 	if err := w.Frame(&ops); err != nil {
@@ -21,7 +21,7 @@ type vkContext struct {
 }

 func init() {
-	newContextFallback = newVulkanContext
+	newContextPrimary = newVulkanContext
 }

 func newVulkanContext() (context, error) {
@@ -7,7 +7,6 @@ import (
 	"fmt"
 	"image"
 	"math"
-	"math/bits"
 	"unsafe"

 	"golang.org/x/sys/windows"
@@ -59,7 +58,6 @@ type Texture struct {

 	width   int
 	height  int
-	mipmap  bool
 	foreign bool
 }

@@ -221,33 +219,17 @@ 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: uint32(nmipmaps),
+		MipLevels: 1,
 		ArraySize: 1,
 		Format:    d3dfmt,
 		SampleDesc: d3d11.DXGI_SAMPLE_DESC{
 			Count:   1,
 			Quality: 0,
 		},
-		BindFlags: bindFlags,
-		MiscFlags: miscFlags,
+		BindFlags: convBufferBinding(bindings),
 	})
 	if err != nil {
 		return nil, err
@@ -265,8 +247,6 @@ 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)
@@ -345,7 +325,7 @@ 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, mipmap: mipmap}, nil
+	return &Texture{backend: b, format: d3dfmt, tex: tex, sampler: sampler, resView: resView, uaView: uaView, renderTarget: fbo, bindings: bindings, width: width, height: height}, nil
 }

 func (b *Backend) newInputLayout(vertexShader shader.Sources, layout []driver.InputDesc) (*d3d11.InputLayout, error) {
@@ -629,9 +609,6 @@ 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() {
@@ -166,7 +166,6 @@ const (
 const (
 	FilterNearest TextureFilter = iota
 	FilterLinear
-	FilterLinearMipmapLinear
 )

 const (
@@ -13,8 +13,10 @@ import (
 )

 /*
-#cgo CFLAGS: -Werror -xobjective-c -fobjc-arc
-#cgo LDFLAGS: -framework CoreGraphics -framework Metal -framework Foundation
+#cgo CFLAGS: -Werror -xobjective-c -fmodules -fobjc-arc
+#cgo LDFLAGS: -framework CoreGraphics
+
+@import Metal;

 #include <CoreFoundation/CoreFoundation.h>
 #include <Metal/Metal.h>
@@ -239,14 +241,6 @@ static void blitEncCopyBufferToTexture(CFTypeRef blitEncRef, CFTypeRef bufRef, C
 	}
 }

-static void blitEncGenerateMipmapsForTexture(CFTypeRef blitEncRef, CFTypeRef texRef) {
-	@autoreleasepool {
-		id<MTLBlitCommandEncoder> enc = (__bridge id<MTLBlitCommandEncoder>)blitEncRef;
-		id<MTLTexture> tex = (__bridge id<MTLTexture>)texRef;
-		[enc generateMipmapsForTexture: tex];
-	}
-}
-
 static void blitEncCopyTextureToBuffer(CFTypeRef blitEncRef, CFTypeRef texRef, CFTypeRef bufRef, NSUInteger offset, NSUInteger stride, NSUInteger length, MTLSize dims, MTLOrigin orig) {
 	@autoreleasepool {
 		id<MTLBlitCommandEncoder> enc = (__bridge id<MTLBlitCommandEncoder>)blitEncRef;
@@ -277,26 +271,25 @@ static void blitEncCopyBufferToBuffer(CFTypeRef blitEncRef, CFTypeRef srcRef, CF
 	}
 }

-static CFTypeRef newTexture(CFTypeRef devRef, NSUInteger width, NSUInteger height, MTLPixelFormat format, MTLTextureUsage usage, int mipmapped) {
+static CFTypeRef newTexture(CFTypeRef devRef, NSUInteger width, NSUInteger height, MTLPixelFormat format, MTLTextureUsage usage) {
 	@autoreleasepool {
 		id<MTLDevice> dev = (__bridge id<MTLDevice>)devRef;
 		MTLTextureDescriptor *mtlDesc = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat: format
 																						   width: width
 																						  height: height
-																				   	   mipmapped: mipmapped ? YES : NO];
+																				   	   mipmapped: NO];
 		mtlDesc.usage = usage;
 		mtlDesc.storageMode =  MTLStorageModePrivate;
 		return CFBridgingRetain([dev newTextureWithDescriptor:mtlDesc]);
 	}
 }

-static CFTypeRef newSampler(CFTypeRef devRef, MTLSamplerMinMagFilter minFilter, MTLSamplerMinMagFilter magFilter, MTLSamplerMipFilter mipFilter) {
+static CFTypeRef newSampler(CFTypeRef devRef, MTLSamplerMinMagFilter minFilter, MTLSamplerMinMagFilter magFilter) {
 	@autoreleasepool {
 		id<MTLDevice> dev = (__bridge id<MTLDevice>)devRef;
 		MTLSamplerDescriptor *desc = [MTLSamplerDescriptor new];
 		desc.minFilter = minFilter;
 		desc.magFilter = magFilter;
-		desc.mipFilter = mipFilter;
 		return CFBridgingRetain([dev newSamplerStateWithDescriptor:desc]);
 	}
 }
@@ -414,7 +407,6 @@ type Texture struct {
 	sampler C.CFTypeRef
 	width   int
 	height  int
-	mipmap  bool
 	foreign bool
 }

@@ -591,33 +583,26 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
 	if bindings&driver.BufferBindingShaderStorageWrite != 0 {
 		usage |= C.MTLTextureUsageShaderWrite
 	}
-	min, mip := samplerFilterFor(minFilter)
-	max, _ := samplerFilterFor(magFilter)
-	mipmap := mip != C.MTLSamplerMipFilterNotMipmapped
-	mipmapped := C.int(0)
-	if mipmap {
-		mipmapped = 1
-	}
-	tex := C.newTexture(b.dev, C.NSUInteger(width), C.NSUInteger(height), mformat, usage, mipmapped)
+	tex := C.newTexture(b.dev, C.NSUInteger(width), C.NSUInteger(height), mformat, usage)
 	if tex == 0 {
 		return nil, errors.New("metal: [MTLDevice newTextureWithDescriptor:] failed")
 	}
-	s := C.newSampler(b.dev, min, max, mip)
+	min := samplerFilterFor(minFilter)
+	max := samplerFilterFor(magFilter)
+	s := C.newSampler(b.dev, min, max)
 	if s == 0 {
 		C.CFRelease(tex)
 		return nil, errors.New("metal: [MTLDevice newSamplerStateWithDescriptor:] failed")
 	}
-	return &Texture{backend: b, texture: tex, sampler: s, width: width, height: height, mipmap: mipmap}, nil
+	return &Texture{backend: b, texture: tex, sampler: s, width: width, height: height}, nil
 }

-func samplerFilterFor(f driver.TextureFilter) (C.MTLSamplerMinMagFilter, C.MTLSamplerMipFilter) {
+func samplerFilterFor(f driver.TextureFilter) C.MTLSamplerMinMagFilter {
 	switch f {
 	case driver.FilterNearest:
-		return C.MTLSamplerMinMagFilterNearest, C.MTLSamplerMipFilterNotMipmapped
+		return C.MTLSamplerMinMagFilterNearest
 	case driver.FilterLinear:
-		return C.MTLSamplerMinMagFilterLinear, C.MTLSamplerMipFilterNotMipmapped
-	case driver.FilterLinearMipmapLinear:
-		return C.MTLSamplerMinMagFilterLinear, C.MTLSamplerMipFilterLinear
+		return C.MTLSamplerMinMagFilterLinear
 	default:
 		panic("invalid texture filter")
 	}
@@ -917,9 +902,6 @@ func (t *Texture) Upload(offset, size image.Point, pixels []byte, stride int) {
 		depth:  1,
 	}
 	C.blitEncCopyBufferToTexture(enc, buf, t.texture, C.NSUInteger(off), C.NSUInteger(dstStride), C.NSUInteger(len(store)), msize, orig)
-	if t.mipmap {
-		C.blitEncGenerateMipmapsForTexture(enc, t.texture)
-	}
 }

 func (t *Texture) Release() {
@@ -6,7 +6,6 @@ import (
 	"errors"
 	"fmt"
 	"image"
-	"math/bits"
 	"runtime"
 	"strings"
 	"time"
@@ -50,6 +49,7 @@ type Backend struct {
 type glState struct {
 	drawFBO     gl.Framebuffer
 	readFBO     gl.Framebuffer
+	renderBuf   gl.Renderbuffer
 	vertAttribs [5]struct {
 		obj        gl.Buffer
 		enabled    bool
@@ -106,7 +106,6 @@ type texture struct {
 	triple   textureTriple
 	width    int
 	height   int
-	mipmap   bool
 	bindings driver.BufferBinding
 	foreign  bool
 }
@@ -155,6 +154,11 @@ type uniformLocation struct {
 	size    int
 }

+type inputLayout struct {
+	inputs []shader.InputLocation
+	layout []driver.InputDesc
+}
+
 // textureTriple holds the type settings for
 // a TexImage2D call.
 type textureTriple struct {
@@ -245,17 +249,13 @@ func (b *Backend) BeginFrame(target driver.RenderTarget, clear bool, viewport im
 	b.glstate.bindFramebuffer(b.funcs, gl.FRAMEBUFFER, renderFBO)
 	if b.gles {
 		// If the output framebuffer is not in the sRGB colorspace already, emulate it.
-		fbSRGB := false
-		if !b.gles || b.glver[0] > 2 {
-			var fbEncoding int
-			if !renderFBO.Valid() {
-				fbEncoding = b.funcs.GetFramebufferAttachmentParameteri(gl.FRAMEBUFFER, gl.BACK, gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING)
-			} else {
-				fbEncoding = b.funcs.GetFramebufferAttachmentParameteri(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING)
-			}
-			fbSRGB = fbEncoding != gl.LINEAR
+		var fbEncoding int
+		if !renderFBO.Valid() {
+			fbEncoding = b.funcs.GetFramebufferAttachmentParameteri(gl.FRAMEBUFFER, gl.BACK, gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING)
+		} else {
+			fbEncoding = b.funcs.GetFramebufferAttachmentParameteri(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING)
 		}
-		if !fbSRGB && viewport != (image.Point{}) {
+		if fbEncoding == gl.LINEAR && viewport != (image.Point{}) {
 			if b.sRGBFBO == nil {
 				sfbo, err := NewSRGBFBO(b.funcs, &b.glstate)
 				if err != nil {
@@ -307,16 +307,14 @@ func (b *Backend) EndFrame() {

 func (b *Backend) queryState() glState {
 	s := glState{
-		prog:       gl.Program(b.funcs.GetBinding(gl.CURRENT_PROGRAM)),
-		arrayBuf:   gl.Buffer(b.funcs.GetBinding(gl.ARRAY_BUFFER_BINDING)),
-		elemBuf:    gl.Buffer(b.funcs.GetBinding(gl.ELEMENT_ARRAY_BUFFER_BINDING)),
-		drawFBO:    gl.Framebuffer(b.funcs.GetBinding(gl.FRAMEBUFFER_BINDING)),
-		clearColor: b.funcs.GetFloat4(gl.COLOR_CLEAR_VALUE),
-		viewport:   b.funcs.GetInteger4(gl.VIEWPORT),
-	}
-	if !b.gles || b.glver[0] > 2 {
-		s.unpack_row_length = b.funcs.GetInteger(gl.UNPACK_ROW_LENGTH)
-		s.pack_row_length = b.funcs.GetInteger(gl.PACK_ROW_LENGTH)
+		prog:              gl.Program(b.funcs.GetBinding(gl.CURRENT_PROGRAM)),
+		arrayBuf:          gl.Buffer(b.funcs.GetBinding(gl.ARRAY_BUFFER_BINDING)),
+		elemBuf:           gl.Buffer(b.funcs.GetBinding(gl.ELEMENT_ARRAY_BUFFER_BINDING)),
+		drawFBO:           gl.Framebuffer(b.funcs.GetBinding(gl.FRAMEBUFFER_BINDING)),
+		clearColor:        b.funcs.GetFloat4(gl.COLOR_CLEAR_VALUE),
+		viewport:          b.funcs.GetInteger4(gl.VIEWPORT),
+		unpack_row_length: b.funcs.GetInteger(gl.UNPACK_ROW_LENGTH),
+		pack_row_length:   b.funcs.GetInteger(gl.PACK_ROW_LENGTH),
 	}
 	s.blend.enable = b.funcs.IsEnabled(gl.BLEND)
 	s.blend.srcRGB = gl.Enum(b.funcs.GetInteger(gl.BLEND_SRC_RGB))
@@ -428,6 +426,13 @@ func (s *glState) activeTexture(f *gl.Functions, unit gl.Enum) {
 	}
 }

+func (s *glState) bindRenderbuffer(f *gl.Functions, target gl.Enum, r gl.Renderbuffer) {
+	if !r.Equal(s.renderBuf) {
+		f.BindRenderbuffer(gl.RENDERBUFFER, r)
+		s.renderBuf = r
+	}
+}
+
 func (s *glState) bindTexture(f *gl.Functions, unit int, t gl.Texture) {
 	s.activeTexture(f, gl.TEXTURE0+gl.Enum(unit))
 	if !t.Equal(s.texUnits.binds[unit]) {
@@ -443,6 +448,13 @@ func (s *glState) bindVertexArray(f *gl.Functions, a gl.VertexArray) {
 	}
 }

+func (s *glState) deleteRenderbuffer(f *gl.Functions, r gl.Renderbuffer) {
+	f.DeleteRenderbuffer(r)
+	if r.Equal(s.renderBuf) {
+		s.renderBuf = gl.Renderbuffer{}
+	}
+}
+
 func (s *glState) deleteFramebuffer(f *gl.Functions, fbo gl.Framebuffer) {
 	f.DeleteFramebuffer(fbo)
 	if fbo.Equal(s.drawFBO) {
@@ -703,29 +715,13 @@ func (b *Backend) NewTexture(format driver.TextureFormat, width, height int, min
 		return nil, errors.New("unsupported texture format")
 	}
 	b.BindTexture(0, tex)
-	min, mipmap := toTexFilter(minFilter)
-	mag, _ := toTexFilter(magFilter)
-	if b.gles && b.glver[0] < 3 {
-		// OpenGL ES 2 only supports mipmaps for power-of-two textures.
-		mipmap = false
-	}
-	tex.mipmap = mipmap
-	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, mag)
-	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, min)
+	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, toTexFilter(magFilter))
+	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, toTexFilter(minFilter))
 	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
 	b.funcs.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
-	if mipmap {
-		nmipmaps := 1
-		if mipmap {
-			dim := width
-			if height > dim {
-				dim = height
-			}
-			log2 := 32 - bits.LeadingZeros32(uint32(dim)) - 1
-			nmipmaps = log2 + 1
-		}
+	if b.gles && b.glver[0] >= 3 {
 		// Immutable textures are required for BindImageTexture, and can't hurt otherwise.
-		b.funcs.TexStorage2D(gl.TEXTURE_2D, nmipmaps, tex.triple.internalFormat, width, height)
+		b.funcs.TexStorage2D(gl.TEXTURE_2D, 1, tex.triple.internalFormat, width, height)
 	} else {
 		b.funcs.TexImage2D(gl.TEXTURE_2D, 0, tex.triple.internalFormat, width, height, tex.triple.format, tex.triple.typ)
 	}
@@ -1160,25 +1156,17 @@ func (b *Backend) CopyTexture(dst driver.Texture, dstOrigin image.Point, src dri
 func (t *texture) ReadPixels(src image.Rectangle, pixels []byte, stride int) error {
 	glErr(t.backend.funcs)
 	t.backend.glstate.bindFramebuffer(t.backend.funcs, gl.FRAMEBUFFER, t.ensureFBO())
-	w, h := src.Dx(), src.Dy()
-	if len(pixels) < w*h*4 {
+	if len(pixels) < src.Dx()*src.Dy()*4 {
 		return errors.New("unexpected RGBA size")
 	}
-	// OpenGL ES 2 doesn't support PACK_ROW_LENGTH != 0. Avoid it if possible.
+	w, h := src.Dx(), src.Dy()
+	// WebGL 1 doesn't support PACK_ROW_LENGTH != 0. Avoid it if possible.
 	rowLen := 0
 	if n := stride / 4; n != w {
 		rowLen = n
 	}
-	if rowLen == 0 || t.backend.glver[0] > 2 {
-		t.backend.glstate.pixelStorei(t.backend.funcs, gl.PACK_ROW_LENGTH, rowLen)
-		t.backend.funcs.ReadPixels(src.Min.X, src.Min.Y, w, h, gl.RGBA, gl.UNSIGNED_BYTE, pixels)
-	} else {
-		tmp := make([]byte, w*h*4)
-		t.backend.funcs.ReadPixels(src.Min.X, src.Min.Y, w, h, gl.RGBA, gl.UNSIGNED_BYTE, tmp)
-		for y := 0; y < h; y++ {
-			copy(pixels[y*stride:], tmp[y*w*4:])
-		}
-	}
+	t.backend.glstate.pixelStorei(t.backend.funcs, gl.PACK_ROW_LENGTH, rowLen)
+	t.backend.funcs.ReadPixels(src.Min.X, src.Min.Y, w, h, gl.RGBA, gl.UNSIGNED_BYTE, pixels)
 	return glErr(t.backend.funcs)
 }

@@ -1219,14 +1207,12 @@ func (p *pipeline) Release() {
 	*p = pipeline{}
 }

-func toTexFilter(f driver.TextureFilter) (int, bool) {
+func toTexFilter(f driver.TextureFilter) int {
 	switch f {
 	case driver.FilterNearest:
-		return gl.NEAREST, false
+		return gl.NEAREST
 	case driver.FilterLinear:
-		return gl.LINEAR, false
-	case driver.FilterLinearMipmapLinear:
-		return gl.LINEAR_MIPMAP_LINEAR, true
+		return gl.LINEAR
 	default:
 		panic("unsupported texture filter")
 	}
@@ -1260,9 +1246,6 @@ func (t *texture) Upload(offset, size image.Point, pixels []byte, stride int) {
 	}
 	t.backend.glstate.pixelStorei(t.backend.funcs, gl.UNPACK_ROW_LENGTH, rowLen)
 	t.backend.funcs.TexSubImage2D(gl.TEXTURE_2D, 0, offset.X, offset.Y, size.X, size.Y, t.triple.format, t.triple.typ, pixels)
-	if t.mipmap {
-		t.backend.funcs.GenerateMipmap(gl.TEXTURE_2D)
-	}
 }

 func (t *timer) Begin() {
@@ -15,7 +15,6 @@ import (
 	"gioui.org/op"
 	"gioui.org/op/clip"
 	"gioui.org/op/paint"
-	"gioui.org/text"
 	"gioui.org/widget/material"
 )

@@ -34,8 +33,7 @@ func setupBenchmark(b *testing.B) (layout.Context, *headless.Window, *material.T
 		Ops:         ops,
 		Constraints: layout.Exact(sz),
 	}
-	th := material.NewTheme()
-	th.Shaper = text.NewShaper(text.WithCollection(gofont.Collection()))
+	th := material.NewTheme(gofont.Collection())
 	return gtx, w, th
 }

@@ -88,7 +86,7 @@ func BenchmarkDrawUI(b *testing.B) {
 		resetOps(gtx)

 		off := float32(math.Mod(float64(i)/10, 10))
-		t := op.Affine(f32.Affine2D{}.Offset(f32.Pt(off, off))).Push(gtx.Ops)
+		t := op.Offset(f32.Pt(off, off)).Push(gtx.Ops)

 		drawCore(gtx, th)

@@ -159,13 +157,13 @@ func Benchmark1000CirclesInstanced(b *testing.B) {
 func draw1000Circles(gtx layout.Context) {
 	ops := gtx.Ops
 	for x := 0; x < 100; x++ {
-		op.Offset(image.Pt(x*10, 0)).Add(ops)
+		op.Offset(f32.Pt(float32(x*10), 0)).Add(ops)
 		for y := 0; y < 10; y++ {
 			paint.FillShape(ops,
 				color.NRGBA{R: 100 + uint8(x), G: 100 + uint8(y), B: 100, A: 120},
-				clip.RRect{Rect: image.Rect(0, 0, 10, 10), NE: 5, SE: 5, SW: 5, NW: 5}.Op(ops),
+				clip.RRect{Rect: f32.Rect(0, 0, 10, 10), NE: 5, SE: 5, SW: 5, NW: 5}.Op(ops),
 			)
-			op.Offset(image.Pt(0, 100)).Add(ops)
+			op.Offset(f32.Pt(0, float32(100))).Add(ops)
 		}
 	}
 }
@@ -174,17 +172,17 @@ func draw1000CirclesInstanced(gtx layout.Context) {
 	ops := gtx.Ops

 	r := op.Record(ops)
-	cl := clip.RRect{Rect: image.Rect(0, 0, 10, 10), NE: 5, SE: 5, SW: 5, NW: 5}.Push(ops)
+	cl := clip.RRect{Rect: f32.Rect(0, 0, 10, 10), NE: 5, SE: 5, SW: 5, NW: 5}.Push(ops)
 	paint.PaintOp{}.Add(ops)
 	cl.Pop()
 	c := r.Stop()

 	for x := 0; x < 100; x++ {
-		op.Offset(image.Pt(x*10, 0)).Add(ops)
+		op.Offset(f32.Pt(float32(x*10), 0)).Add(ops)
 		for y := 0; y < 10; y++ {
 			paint.ColorOp{Color: color.NRGBA{R: 100 + uint8(x), G: 100 + uint8(y), B: 100, A: 120}}.Add(ops)
 			c.Add(ops)
-			op.Offset(image.Pt(0, 100)).Add(ops)
+			op.Offset(f32.Pt(0, float32(100))).Add(ops)
 		}
 	}
 }
@@ -205,13 +203,13 @@ func drawIndividualShapes(gtx layout.Context, th *material.Theme) chan op.CallOp
 		ops := &op1
 		c := op.Record(ops)
 		for x := 0; x < 9; x++ {
-			op.Offset(image.Pt(x*50, 0)).Add(ops)
+			op.Offset(f32.Pt(float32(x*50), 0)).Add(ops)
 			for y := 0; y < 9; y++ {
 				paint.FillShape(ops,
 					color.NRGBA{R: 100 + uint8(x), G: 100 + uint8(y), B: 100, A: 120},
-					clip.RRect{Rect: image.Rect(0, 0, 25, 25), NE: 10, SE: 10, SW: 10, NW: 10}.Op(ops),
+					clip.RRect{Rect: f32.Rect(0, 0, 25, 25), NE: 10, SE: 10, SW: 10, NW: 10}.Op(ops),
 				)
-				op.Offset(image.Pt(0, 50)).Add(ops)
+				op.Offset(f32.Pt(0, float32(50))).Add(ops)
 			}
 		}
 		c1 <- c.Stop()
@@ -226,7 +224,7 @@ func drawShapeInstances(gtx layout.Context, th *material.Theme) chan op.CallOp {
 		co := op.Record(ops)

 		r := op.Record(ops)
-		cl := clip.RRect{Rect: image.Rect(0, 0, 25, 25), NE: 10, SE: 10, SW: 10, NW: 10}.Push(ops)
+		cl := clip.RRect{Rect: f32.Rect(0, 0, 25, 25), NE: 10, SE: 10, SW: 10, NW: 10}.Push(ops)
 		paint.PaintOp{}.Add(ops)
 		cl.Pop()
 		c := r.Stop()
@@ -235,7 +233,7 @@ func drawShapeInstances(gtx layout.Context, th *material.Theme) chan op.CallOp {
 		rad := float32(0)
 		for x := 0; x < 20; x++ {
 			for y := 0; y < 20; y++ {
-				t := op.Offset(image.Pt(x*50+25, y*50+25)).Push(ops)
+				t := op.Offset(f32.Pt(float32(x*50+25), float32(y*50+25))).Push(ops)
 				c.Add(ops)
 				t.Pop()
 				rad += math.Pi * 2 / 400
@@ -255,7 +253,7 @@ func drawText(gtx layout.Context, th *material.Theme) chan op.CallOp {
 		txt := material.H6(th, "")
 		for x := 0; x < 40; x++ {
 			txt.Text = textRows[x]
-			t := op.Offset(image.Pt(0, 24*x)).Push(ops)
+			t := op.Offset(f32.Pt(float32(0), float32(24*x))).Push(ops)
 			gtx.Ops = ops
 			txt.Layout(gtx)
 			t.Pop()
@@ -29,7 +29,7 @@ func TestPaintRect(t *testing.T) {

 func TestPaintClippedRect(t *testing.T) {
 	run(t, func(o *op.Ops) {
-		defer clip.RRect{Rect: image.Rect(25, 25, 60, 60)}.Push(o).Pop()
+		defer clip.RRect{Rect: f32.Rect(25, 25, 60, 60)}.Push(o).Pop()
 		paint.FillShape(o, red, clip.Rect(image.Rect(0, 0, 50, 50)).Op())
 	}, func(r result) {
 		r.expect(0, 0, transparent)
@@ -42,8 +42,8 @@ func TestPaintClippedRect(t *testing.T) {

 func TestPaintClippedCircle(t *testing.T) {
 	run(t, func(o *op.Ops) {
-		const r = 10
-		defer clip.RRect{Rect: image.Rect(20, 20, 40, 40), SE: r, SW: r, NW: r, NE: r}.Push(o).Pop()
+		r := float32(10)
+		defer clip.RRect{Rect: f32.Rect(20, 20, 40, 40), SE: r, SW: r, NW: r, NE: r}.Push(o).Pop()
 		defer clip.Rect(image.Rect(0, 0, 30, 50)).Push(o).Pop()
 		paint.Fill(o, red)
 	}, func(r result) {
@@ -124,13 +124,13 @@ func TestPaintTexture(t *testing.T) {
 func TestTexturedStrokeClipped(t *testing.T) {
 	run(t, func(o *op.Ops) {
 		smallSquares.Add(o)
-		defer op.Offset(image.Pt(50, 50)).Push(o).Pop()
+		defer op.Offset(f32.Pt(50, 50)).Push(o).Pop()
 		defer clip.Stroke{
-			Path:  clip.RRect{Rect: image.Rect(0, 0, 30, 30)}.Path(o),
+			Path:  clip.RRect{Rect: f32.Rect(0, 0, 30, 30)}.Path(o),
 			Width: 10,
 		}.Op().Push(o).Pop()
-		defer clip.RRect{Rect: image.Rect(-30, -30, 60, 60)}.Push(o).Pop()
-		defer op.Offset(image.Pt(-10, -10)).Push(o).Pop()
+		defer clip.RRect{Rect: f32.Rect(-30, -30, 60, 60)}.Push(o).Pop()
+		defer op.Offset(f32.Pt(-10, -10)).Push(o).Pop()
 		paint.PaintOp{}.Add(o)
 	}, func(r result) {
 	})
@@ -139,12 +139,12 @@ func TestTexturedStrokeClipped(t *testing.T) {
 func TestTexturedStroke(t *testing.T) {
 	run(t, func(o *op.Ops) {
 		smallSquares.Add(o)
-		defer op.Offset(image.Pt(50, 50)).Push(o).Pop()
+		defer op.Offset(f32.Pt(50, 50)).Push(o).Pop()
 		defer clip.Stroke{
-			Path:  clip.RRect{Rect: image.Rect(0, 0, 30, 30)}.Path(o),
+			Path:  clip.RRect{Rect: f32.Rect(0, 0, 30, 30)}.Path(o),
 			Width: 10,
 		}.Op().Push(o).Pop()
-		defer op.Offset(image.Pt(-10, -10)).Push(o).Pop()
+		defer op.Offset(f32.Pt(-10, -10)).Push(o).Pop()
 		paint.PaintOp{}.Add(o)
 	}, func(r result) {
 	})
@@ -153,7 +153,7 @@ func TestTexturedStroke(t *testing.T) {
 func TestPaintClippedTexture(t *testing.T) {
 	run(t, func(o *op.Ops) {
 		squares.Add(o)
-		defer clip.RRect{Rect: image.Rect(0, 0, 40, 40)}.Push(o).Pop()
+		defer clip.RRect{Rect: f32.Rect(0, 0, 40, 40)}.Push(o).Pop()
 		defer scale(80.0/512, 80.0/512).Push(o).Pop()
 		paint.PaintOp{}.Add(o)
 	}, func(r result) {
@@ -163,8 +163,6 @@ func TestPaintClippedTexture(t *testing.T) {
 }

 func TestStrokedPathZeroWidth(t *testing.T) {
-	t.Skip("test broken, see issue 479")
-
 	run(t, func(o *op.Ops) {
 		{
 			p := new(clip.Path)
--- a/Show More
+++ b/Show More