1// Copyright 2015 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5package draw 6 7import ( 8 "bytes" 9 "image" 10 "image/color" 11 "testing" 12) 13 14// TestFastPaths tests that the fast path implementations produce identical 15// results to the generic implementation. 16func TestFastPaths(t *testing.T) { 17 drs := []image.Rectangle{ 18 image.Rect(0, 0, 10, 10), // The dst bounds. 19 image.Rect(3, 4, 8, 6), // A strict subset of the dst bounds. 20 image.Rect(-3, -5, 2, 4), // Partial out-of-bounds #0. 21 image.Rect(4, -2, 6, 12), // Partial out-of-bounds #1. 22 image.Rect(12, 14, 23, 45), // Complete out-of-bounds. 23 image.Rect(5, 5, 5, 5), // Empty. 24 } 25 srs := []image.Rectangle{ 26 image.Rect(0, 0, 12, 9), // The src bounds. 27 image.Rect(2, 2, 10, 8), // A strict subset of the src bounds. 28 image.Rect(10, 5, 20, 20), // Partial out-of-bounds #0. 29 image.Rect(-40, 0, 40, 8), // Partial out-of-bounds #1. 30 image.Rect(-8, -8, -4, -4), // Complete out-of-bounds. 31 image.Rect(5, 5, 5, 5), // Empty. 32 } 33 srcfs := []func(image.Rectangle) (image.Image, error){ 34 srcGray, 35 srcNRGBA, 36 srcRGBA, 37 srcUnif, 38 srcYCbCr, 39 } 40 var srcs []image.Image 41 for _, srcf := range srcfs { 42 src, err := srcf(srs[0]) 43 if err != nil { 44 t.Fatal(err) 45 } 46 srcs = append(srcs, src) 47 } 48 qs := []Interpolator{ 49 NearestNeighbor, 50 ApproxBiLinear, 51 CatmullRom, 52 } 53 ops := []Op{ 54 Over, 55 Src, 56 } 57 blue := image.NewUniform(color.RGBA{0x11, 0x22, 0x44, 0x7f}) 58 59 for _, dr := range drs { 60 for _, src := range srcs { 61 for _, sr := range srs { 62 for _, transform := range []bool{false, true} { 63 for _, q := range qs { 64 for _, op := range ops { 65 dst0 := image.NewRGBA(drs[0]) 66 dst1 := image.NewRGBA(drs[0]) 67 Draw(dst0, dst0.Bounds(), blue, image.Point{}, Src) 68 Draw(dstWrapper{dst1}, dst1.Bounds(), srcWrapper{blue}, image.Point{}, Src) 69 70 if transform { 71 m := transformMatrix(3.75, 2, 1) 72 q.Transform(dst0, m, src, sr, op, nil) 73 q.Transform(dstWrapper{dst1}, m, srcWrapper{src}, sr, op, nil) 74 } else { 75 q.Scale(dst0, dr, src, sr, op, nil) 76 q.Scale(dstWrapper{dst1}, dr, srcWrapper{src}, sr, op, nil) 77 } 78 79 if !bytes.Equal(dst0.Pix, dst1.Pix) { 80 t.Errorf("pix differ for dr=%v, src=%T, sr=%v, transform=%t, q=%T", 81 dr, src, sr, transform, q) 82 } 83 } 84 } 85 } 86 } 87 } 88 } 89} 90