io/profile: [API] delete package

It was a design mistake to make profiling data available to programs.
Rather, profiling should either be a user-configurable debug overlay,
reported through runtime/trace, or both.

This change drops the io/profile package because we're about to overhaul
event routing.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/window.go

@@ -21,7 +21,6 @@ import (
 	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
-	"gioui.org/io/profile"
 	"gioui.org/io/router"
 	"gioui.org/io/system"
 	"gioui.org/layout"
@@ -308,7 +307,7 @@ func (w *Window) frame(frame *op.Ops, viewport image.Point) error {
 	return w.gpu.Frame(frame, target, viewport)
 }
 
-func (w *Window) processFrame(d driver, frameStart time.Time) {
+func (w *Window) processFrame(d driver) {
 	for k := range w.semantic.ids {
 		delete(w.semantic.ids, k)
 	}
@@ -336,13 +335,6 @@ func (w *Window) processFrame(d driver, frameStart time.Time) {
 		w.imeState = newState
 		d.EditorStateChanged(oldState, newState)
 	}
-	if q.Profiling() && w.gpu != nil {
-		frameDur := time.Since(frameStart)
-		frameDur = frameDur.Truncate(100 * time.Microsecond)
-		quantum := 100 * time.Microsecond
-		timings := fmt.Sprintf("tot:%7s %s", frameDur.Round(quantum), w.gpu.Profile())
-		q.Queue(profile.Event{Timings: timings})
-	}
 	if t, ok := q.WakeupTime(); ok {
 		w.setNextFrame(t)
 	}
@@ -844,10 +836,6 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 			break
 		}
 		w.metric = e2.Metric
-		var frameStart time.Time
-		if w.queue.q.Profiling() {
-			frameStart = time.Now()
-		}
 		w.hasNextFrame = false
 		e2.Frame = w.update
 		e2.Queue = &w.queue
@@ -891,7 +879,7 @@ func (w *Window) processEvent(d driver, e event.Event) bool {
 			close(w.destroy)
 			break
 		}
-		w.processFrame(d, frameStart)
+		w.processFrame(d)
 		w.updateCursor(d)
 	case system.DestroyEvent:
 		w.destroyGPU()

gpu/compute.go

@@ -93,7 +93,6 @@ type compute struct {
 		}
 	}
 	timers struct {
-		profile string
 		t       *timers
 		compact *timer
 		render  *timer
@@ -176,7 +175,6 @@ type materialUniforms struct {
 
 type collector struct {
 	hasher     maphash.Hash
-	profile    bool
 	reader     ops.Reader
 	states     []f32.Affine2D
 	clear      bool
@@ -597,7 +595,7 @@ func (g *compute) frame(target RenderTarget) error {
 	defer g.ctx.EndFrame()
 
 	t := &g.timers
-	if g.collector.profile && t.t == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
+	if false && t.t == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
 		t.t = newTimers(g.ctx)
 		t.compact = t.t.newTimer()
 		t.render = t.t.newTimer()
@@ -631,13 +629,13 @@ func (g *compute) frame(target RenderTarget) error {
 		return err
 	}
 	t.compact.end()
-	if g.collector.profile && t.t.ready() {
+	if false && t.t.ready() {
 		com, ren, blit := t.compact.Elapsed, t.render.Elapsed, t.blit.Elapsed
 		ft := com + ren + blit
 		q := 100 * time.Microsecond
 		ft = ft.Round(q)
 		com, ren, blit = com.Round(q), ren.Round(q), blit.Round(q)
-		t.profile = fmt.Sprintf("ft:%7s com: %7s ren:%7s blit:%7s", ft, com, ren, blit)
+		// t.profile = fmt.Sprintf("ft:%7s com: %7s ren:%7s blit:%7s", ft, com, ren, blit)
 	}
 	return nil
 }
@@ -661,10 +659,6 @@ func (g *compute) dumpAtlases() {
 	}
 }
 
-func (g *compute) Profile() string {
-	return g.timers.profile
-}
-
 func (g *compute) compactAllocs() error {
 	const (
 		maxAllocAge = 3
@@ -1656,7 +1650,6 @@ func (e *encoder) line(start, end f32.Point) {
 
 func (c *collector) reset() {
 	c.prevFrame, c.frame = c.frame, c.prevFrame
-	c.profile = false
 	c.clipStates = c.clipStates[:0]
 	c.transStack = c.transStack[:0]
 	c.frame.reset()
@@ -1736,8 +1729,6 @@ func (c *collector) collect(root *op.Ops, viewport image.Point, texOps *[]textur
 	c.addClip(&state, fview, fview, nil, ops.Key{}, 0, 0, false)
 	for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
-		case ops.TypeProfile:
-			c.profile = true
 		case ops.TypeTransform:
 			dop, push := ops.DecodeTransform(encOp.Data)
 			if push {

gpu/gpu.go

@@ -44,10 +44,6 @@ type GPU interface {
 	Clear(color color.NRGBA)
 	// Frame draws the graphics operations from op into a viewport of target.
 	Frame(frame *op.Ops, target RenderTarget, viewport image.Point) error
-	// Profile returns the last available profiling information. Profiling
-	// information is requested when Frame sees an io/profile.Op, and the result
-	// is available through Profile at some later time.
-	Profile() string
 }
 
 type gpu struct {
@@ -73,7 +69,6 @@ type renderer struct {
 }
 
 type drawOps struct {
-	profile      bool
 	reader       ops.Reader
 	states       []f32.Affine2D
 	transStack   []f32.Affine2D
@@ -399,7 +394,7 @@ func (g *gpu) collect(viewport image.Point, frameOps *op.Ops) {
 	g.renderer.pather.viewport = viewport
 	g.drawOps.reset(viewport)
 	g.drawOps.collect(frameOps, viewport)
-	if g.drawOps.profile && g.timers == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
+	if false && g.timers == nil && g.ctx.Caps().Features.Has(driver.FeatureTimers) {
 		g.frameStart = time.Now()
 		g.timers = newTimers(g.ctx)
 		g.stencilTimer = g.timers.newTimer()
@@ -444,7 +439,7 @@ func (g *gpu) frame(target RenderTarget) error {
 	g.cache.frame()
 	g.drawOps.pathCache.frame()
 	g.cleanupTimer.end()
-	if g.drawOps.profile && g.timers.ready() {
+	if false && g.timers.ready() {
 		st, covt, cleant := g.stencilTimer.Elapsed, g.coverTimer.Elapsed, g.cleanupTimer.Elapsed
 		ft := st + covt + cleant
 		q := 100 * time.Microsecond
@@ -895,7 +890,6 @@ func (r *renderer) drawLayers(layers []opacityLayer, ops []imageOp) {
 }
 
 func (d *drawOps) reset(viewport image.Point) {
-	d.profile = false
 	d.viewport = viewport
 	d.imageOps = d.imageOps[:0]
 	d.pathOps = d.pathOps[:0]
@@ -989,8 +983,6 @@ func (d *drawOps) collectOps(r *ops.Reader, viewport f32.Rectangle) {
 loop:
 	for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
 		switch ops.OpType(encOp.Data[0]) {
-		case ops.TypeProfile:
-			d.profile = true
 		case ops.TypeTransform:
 			dop, push := ops.DecodeTransform(encOp.Data)
 			if push {

internal/ops/ops.go

@@ -76,7 +76,6 @@ const (
 	TypeAux
 	TypeClip
 	TypePopClip
-	TypeProfile
 	TypeCursor
 	TypePath
 	TypeStroke
@@ -162,7 +161,6 @@ const (
 	TypeAuxLen              = 1
 	TypeClipLen             = 1 + 4*4 + 1 + 1
 	TypePopClipLen          = 1
-	TypeProfileLen          = 1
 	TypeCursorLen           = 2
 	TypePathLen             = 8 + 1
 	TypeStrokeLen           = 1 + 4
@@ -446,7 +444,6 @@ var opProps = [0x100]opProp{
 	TypeAux:              {Size: TypeAuxLen, NumRefs: 0},
 	TypeClip:             {Size: TypeClipLen, NumRefs: 0},
 	TypePopClip:          {Size: TypePopClipLen, NumRefs: 0},
-	TypeProfile:          {Size: TypeProfileLen, NumRefs: 1},
 	TypeCursor:           {Size: TypeCursorLen, NumRefs: 0},
 	TypePath:             {Size: TypePathLen, NumRefs: 0},
 	TypeStroke:           {Size: TypeStrokeLen, NumRefs: 0},
@@ -531,8 +528,6 @@ func (t OpType) String() string {
 		return "Clip"
 	case TypePopClip:
 		return "PopClip"
-	case TypeProfile:
-		return "Profile"
 	case TypeCursor:
 		return "Cursor"
 	case TypePath:

io/profile/profile.go

@@ -1,31 +0,0 @@
-// SPDX-License-Identifier: Unlicense OR MIT
-
-// Package profiles provides access to rendering
-// profiles.
-package profile
-
-import (
-	"gioui.org/internal/ops"
-	"gioui.org/io/event"
-	"gioui.org/op"
-)
-
-// Op registers a handler for receiving
-// Events.
-type Op struct {
-	Tag event.Tag
-}
-
-// Event contains profile data from a single
-// rendered frame.
-type Event struct {
-	// Timings. Very likely to change.
-	Timings string
-}
-
-func (p Op) Add(o *op.Ops) {
-	data := ops.Write1(&o.Internal, ops.TypeProfileLen, p.Tag)
-	data[0] = byte(ops.TypeProfile)
-}
-
-func (p Event) ImplementsEvent() {}

io/router/router.go

@@ -25,7 +25,6 @@ import (
 	"gioui.org/io/event"
 	"gioui.org/io/key"
 	"gioui.org/io/pointer"
-	"gioui.org/io/profile"
 	"gioui.org/io/semantic"
 	"gioui.org/io/system"
 	"gioui.org/io/transfer"
@@ -54,10 +53,6 @@ type Router struct {
 	// InvalidateOp summary.
 	wakeup     bool
 	wakeupTime time.Time
-
-	// ProfileOp summary.
-	profHandlers map[event.Tag]struct{}
-	profile      profile.Event
 }
 
 // SemanticNode represents a node in the tree describing the components
@@ -103,10 +98,6 @@ type handlerEvents struct {
 // Events returns the available events for the handler key.
 func (q *Router) Events(k event.Tag) []event.Event {
 	events := q.handlers.Events(k)
-	if _, isprof := q.profHandlers[k]; isprof {
-		delete(q.profHandlers, k)
-		events = append(events, q.profile)
-	}
 	return events
 }
 
@@ -116,9 +107,6 @@ func (q *Router) Events(k event.Tag) []event.Event {
 func (q *Router) Frame(frame *op.Ops) {
 	q.handlers.Clear()
 	q.wakeup = false
-	for k := range q.profHandlers {
-		delete(q.profHandlers, k)
-	}
 	var ops *ops.Ops
 	if frame != nil {
 		ops = &frame.Internal
@@ -157,8 +145,6 @@ func (q *Router) QueueTopmost(events ...key.Event) bool {
 func (q *Router) Queue(events ...event.Event) bool {
 	for _, e := range events {
 		switch e := e.(type) {
-		case profile.Event:
-			q.profile = e
 		case pointer.Event:
 			q.pointer.queue.Push(e, &q.handlers)
 		case key.Event:
@@ -388,12 +374,6 @@ func (q *Router) collect() {
 				q.wakeup = true
 				q.wakeupTime = op.At
 			}
-		case ops.TypeProfile:
-			op := decodeProfileOp(encOp.Data, encOp.Refs)
-			if q.profHandlers == nil {
-				q.profHandlers = make(map[event.Tag]struct{})
-			}
-			q.profHandlers[op.Tag] = struct{}{}
 		case ops.TypeClipboardRead:
 			q.cqueue.ProcessReadClipboard(encOp.Refs)
 		case ops.TypeClipboardWrite:
@@ -556,12 +536,6 @@ func (q *Router) collect() {
 	}
 }
 
-// Profiling reports whether there was profile handlers in the
-// most recent Frame call.
-func (q *Router) Profiling() bool {
-	return len(q.profHandlers) > 0
-}
-
 // WakeupTime returns the most recent time for doing another frame,
 // as determined from the last call to Frame.
 func (q *Router) WakeupTime() (time.Time, bool) {
@@ -604,15 +578,6 @@ func (h *handlerEvents) Clear() {
 	}
 }
 
-func decodeProfileOp(d []byte, refs []interface{}) profile.Op {
-	if ops.OpType(d[0]) != ops.TypeProfile {
-		panic("invalid op")
-	}
-	return profile.Op{
-		Tag: refs[0].(event.Tag),
-	}
-}
-
 func decodeInvalidateOp(d []byte) op.InvalidateOp {
 	bo := binary.LittleEndian
 	if ops.OpType(d[0]) != ops.TypeInvalidate {