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Source file src/image/draw/bench_test.go

Documentation: image/draw

  // 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, 0x44}}
  	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)
  }
  

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