git clone https://git.lucas.co/go_mono.git
draw/stdlib_test.go (2.4K)
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
5 package draw
6
7 import (
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.
16 func 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 }