e5bb9c1e6f
Embedding is more trouble than it's worth. For example, the image/draw package will pick the slow code paths for an embedded *image.RGBA. Change-Id: I64bd20a80814b838850950c05dd8257e5901aef7 Reviewed-on: https://go-review.googlesource.com/12567 Reviewed-by: David Crawshaw <crawshaw@golang.org>
199 lines
3.2 KiB
Go
199 lines
3.2 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package debug provides GL-based debugging tools for apps.
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package debug // import "golang.org/x/mobile/exp/app/debug"
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import (
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"image"
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"image/color"
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"image/draw"
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"sync"
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"time"
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"golang.org/x/mobile/event/config"
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"golang.org/x/mobile/exp/gl/glutil"
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"golang.org/x/mobile/geom"
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)
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var lastDraw = time.Now()
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var fps struct {
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mu sync.Mutex
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c config.Event
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m *glutil.Image
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}
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// DrawFPS draws the per second framerate in the bottom-left of the screen.
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func DrawFPS(c config.Event) {
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const imgW, imgH = 7*(fontWidth+1) + 1, fontHeight + 2
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fps.mu.Lock()
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if fps.c != c || fps.m == nil {
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fps.c = c
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fps.m = glutil.NewImage(imgW, imgH)
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}
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fps.mu.Unlock()
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display := [7]byte{
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4: 'F',
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5: 'P',
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6: 'S',
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}
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now := time.Now()
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f := 0
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if dur := now.Sub(lastDraw); dur > 0 {
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f = int(time.Second / dur)
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}
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display[2] = '0' + byte((f/1e0)%10)
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display[1] = '0' + byte((f/1e1)%10)
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display[0] = '0' + byte((f/1e2)%10)
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draw.Draw(fps.m.RGBA, fps.m.RGBA.Bounds(), image.White, image.Point{}, draw.Src)
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for i, c := range display {
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glyph := glyphs[c]
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if len(glyph) != fontWidth*fontHeight {
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continue
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}
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for y := 0; y < fontHeight; y++ {
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for x := 0; x < fontWidth; x++ {
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if glyph[fontWidth*y+x] == ' ' {
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continue
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}
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fps.m.RGBA.SetRGBA((fontWidth+1)*i+x+1, y+1, color.RGBA{A: 0xff})
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}
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}
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}
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fps.m.Upload()
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fps.m.Draw(
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c,
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geom.Point{0, c.Height - imgH},
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geom.Point{imgW, c.Height - imgH},
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geom.Point{0, c.Height},
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fps.m.RGBA.Bounds(),
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)
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lastDraw = now
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}
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const (
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fontWidth = 5
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fontHeight = 7
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)
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// glyphs comes from the 6x10 fixed font from the plan9port:
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// https://github.com/9fans/plan9port/tree/master/font/fixed
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//
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// 6x10 becomes 5x7 because each glyph has a 1-pixel margin plus space for
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// descenders.
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//
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// Its README file says that those fonts were converted from XFree86, and are
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// in the public domain.
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var glyphs = [256]string{
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'0': "" +
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" X " +
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" X X " +
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"X X" +
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"X X" +
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"X X" +
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" X X " +
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" X ",
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'1': "" +
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" X " +
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" XX " +
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"X X " +
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" X " +
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" X " +
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" X " +
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"XXXXX",
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'2': "" +
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" XXX " +
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"X X" +
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" X" +
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" XX " +
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" X " +
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"X " +
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"XXXXX",
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'3': "" +
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"XXXXX" +
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" X" +
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" X " +
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" XX " +
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" X" +
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"X X" +
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" XXX ",
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'4': "" +
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" X " +
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" XX " +
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" X X " +
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"X X " +
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"XXXXX" +
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" X " +
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" X ",
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'5': "" +
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"XXXXX" +
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"X " +
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"X XX " +
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"XX X" +
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" X" +
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"X X" +
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" XXX ",
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'6': "" +
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" XX " +
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" X " +
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"X " +
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"X XX " +
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"XX X" +
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"X X" +
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" XXX ",
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'7': "" +
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"XXXXX" +
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" X" +
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" X " +
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" X " +
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" X " +
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" X " +
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" X ",
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'8': "" +
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" XXX " +
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"X X" +
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"X X" +
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" XXX " +
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"X X" +
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"X X" +
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" XXX ",
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'9': "" +
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" XXX " +
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"X X" +
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"X XX" +
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" XX X" +
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" X" +
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" X " +
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" XX ",
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'F': "" +
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"XXXXX" +
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"X " +
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"X " +
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"XXXX " +
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"X " +
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"X " +
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"X ",
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'P': "" +
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"XXXX " +
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"X X" +
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"X X" +
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"XXXX " +
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"X " +
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"X " +
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"X ",
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'S': "" +
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" XXX " +
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"X X" +
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"X " +
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" XXX " +
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" X" +
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"X X" +
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" XXX ",
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}
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