Golang程序
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260行
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6.15 KB
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package draw
import (
"image"
"image/color"
"reflect"
"testing"
)
const (
dstw, dsth = 640, 480
srcw, srch = 400, 300
)
var palette = color.Palette{
color.Black,
color.White,
}
// bench benchmarks drawing src and mask images onto a dst image with the
// given op and the color models to create those images from.
// The created images' pixels are initialized to non-zero values.
func bench(b *testing.B, dcm, scm, mcm color.Model, op Op) {
b.StopTimer()
var dst Image
switch dcm {
case color.RGBAModel:
dst1 := image.NewRGBA(image.Rect(0, 0, dstw, dsth))
for y := 0; y < dsth; y++ {
for x := 0; x < dstw; x++ {
dst1.SetRGBA(x, y, color.RGBA{
uint8(5 * x % 0x100),
uint8(7 * y % 0x100),
uint8((7*x + 5*y) % 0x100),
0xff,
})
}
}
dst = dst1
case color.RGBA64Model:
dst1 := image.NewRGBA64(image.Rect(0, 0, dstw, dsth))
for y := 0; y < dsth; y++ {
for x := 0; x < dstw; x++ {
dst1.SetRGBA64(x, y, color.RGBA64{
uint16(53 * x % 0x10000),
uint16(59 * y % 0x10000),
uint16((59*x + 53*y) % 0x10000),
0xffff,
})
}
}
dst = dst1
default:
// The == operator isn't defined on a color.Palette (a slice), so we
// use reflection.
if reflect.DeepEqual(dcm, palette) {
dst1 := image.NewPaletted(image.Rect(0, 0, dstw, dsth), palette)
for y := 0; y < dsth; y++ {
for x := 0; x < dstw; x++ {
dst1.SetColorIndex(x, y, uint8(x^y)&1)
}
}
dst = dst1
} else {
b.Fatal("unknown destination color model", dcm)
}
}
var src image.Image
switch scm {
case nil:
src = &image.Uniform{C: color.RGBA{0x11, 0x22, 0x33, 0xff}}
case color.CMYKModel:
src1 := image.NewCMYK(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
src1.SetCMYK(x, y, color.CMYK{
uint8(13 * x % 0x100),
uint8(11 * y % 0x100),
uint8((11*x + 13*y) % 0x100),
uint8((31*x + 37*y) % 0x100),
})
}
}
src = src1
case color.GrayModel:
src1 := image.NewGray(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
src1.SetGray(x, y, color.Gray{
uint8((11*x + 13*y) % 0x100),
})
}
}
src = src1
case color.RGBAModel:
src1 := image.NewRGBA(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
src1.SetRGBA(x, y, color.RGBA{
uint8(13 * x % 0x80),
uint8(11 * y % 0x80),
uint8((11*x + 13*y) % 0x80),
0x7f,
})
}
}
src = src1
case color.RGBA64Model:
src1 := image.NewRGBA64(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
src1.SetRGBA64(x, y, color.RGBA64{
uint16(103 * x % 0x8000),
uint16(101 * y % 0x8000),
uint16((101*x + 103*y) % 0x8000),
0x7fff,
})
}
}
src = src1
case color.NRGBAModel:
src1 := image.NewNRGBA(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
src1.SetNRGBA(x, y, color.NRGBA{
uint8(13 * x % 0x100),
uint8(11 * y % 0x100),
uint8((11*x + 13*y) % 0x100),
0x7f,
})
}
}
src = src1
case color.YCbCrModel:
yy := make([]uint8, srcw*srch)
cb := make([]uint8, srcw*srch)
cr := make([]uint8, srcw*srch)
for i := range yy {
yy[i] = uint8(3 * i % 0x100)
cb[i] = uint8(5 * i % 0x100)
cr[i] = uint8(7 * i % 0x100)
}
src = &image.YCbCr{
Y: yy,
Cb: cb,
Cr: cr,
YStride: srcw,
CStride: srcw,
SubsampleRatio: image.YCbCrSubsampleRatio444,
Rect: image.Rect(0, 0, srcw, srch),
}
default:
b.Fatal("unknown source color model", scm)
}
var mask image.Image
switch mcm {
case nil:
// No-op.
case color.AlphaModel:
mask1 := image.NewAlpha(image.Rect(0, 0, srcw, srch))
for y := 0; y < srch; y++ {
for x := 0; x < srcw; x++ {
a := uint8((23*x + 29*y) % 0x100)
// Glyph masks are typically mostly zero,
// so we only set a quarter of mask1's pixels.
if a >= 0xc0 {
mask1.SetAlpha(x, y, color.Alpha{a})
}
}
}
mask = mask1
default:
b.Fatal("unknown mask color model", mcm)
}
b.StartTimer()
for i := 0; i < b.N; i++ {
// Scatter the destination rectangle to draw into.
x := 3 * i % (dstw - srcw)
y := 7 * i % (dsth - srch)
DrawMask(dst, dst.Bounds().Add(image.Pt(x, y)), src, image.ZP, mask, image.ZP, op)
}
}
// The BenchmarkFoo functions exercise a drawFoo fast-path function in draw.go.
func BenchmarkFillOver(b *testing.B) {
bench(b, color.RGBAModel, nil, nil, Over)
}
func BenchmarkFillSrc(b *testing.B) {
bench(b, color.RGBAModel, nil, nil, Src)
}
func BenchmarkCopyOver(b *testing.B) {
bench(b, color.RGBAModel, color.RGBAModel, nil, Over)
}
func BenchmarkCopySrc(b *testing.B) {
bench(b, color.RGBAModel, color.RGBAModel, nil, Src)
}
func BenchmarkNRGBAOver(b *testing.B) {
bench(b, color.RGBAModel, color.NRGBAModel, nil, Over)
}
func BenchmarkNRGBASrc(b *testing.B) {
bench(b, color.RGBAModel, color.NRGBAModel, nil, Src)
}
func BenchmarkYCbCr(b *testing.B) {
bench(b, color.RGBAModel, color.YCbCrModel, nil, Over)
}
func BenchmarkGray(b *testing.B) {
bench(b, color.RGBAModel, color.GrayModel, nil, Over)
}
func BenchmarkCMYK(b *testing.B) {
bench(b, color.RGBAModel, color.CMYKModel, nil, Over)
}
func BenchmarkGlyphOver(b *testing.B) {
bench(b, color.RGBAModel, nil, color.AlphaModel, Over)
}
func BenchmarkRGBA(b *testing.B) {
bench(b, color.RGBAModel, color.RGBA64Model, nil, Src)
}
func BenchmarkPaletted(b *testing.B) {
bench(b, palette, color.RGBAModel, nil, Src)
}
// The BenchmarkGenericFoo functions exercise the generic, slow-path code.
func BenchmarkGenericOver(b *testing.B) {
bench(b, color.RGBA64Model, color.RGBA64Model, nil, Over)
}
func BenchmarkGenericMaskOver(b *testing.B) {
bench(b, color.RGBA64Model, color.RGBA64Model, color.AlphaModel, Over)
}
func BenchmarkGenericSrc(b *testing.B) {
bench(b, color.RGBA64Model, color.RGBA64Model, nil, Src)
}
func BenchmarkGenericMaskSrc(b *testing.B) {
bench(b, color.RGBA64Model, color.RGBA64Model, color.AlphaModel, Src)
}