97 lines
2.7 KiB
Go
97 lines
2.7 KiB
Go
// Copyright 2015 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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// +build go1.9
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package draw
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// This file contains tests that depend on the exact behavior of the
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// image/color package in the standard library. The color conversion formula
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// from YCbCr to RGBA changed between Go 1.4 and Go 1.5, and between Go 1.8 and
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// Go 1.9, so this file's tests are only enabled for Go 1.9 and above.
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import (
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"bytes"
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"image"
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"image/color"
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"testing"
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)
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// TestFastPaths tests that the fast path implementations produce identical
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// results to the generic implementation.
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func TestFastPaths(t *testing.T) {
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drs := []image.Rectangle{
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image.Rect(0, 0, 10, 10), // The dst bounds.
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image.Rect(3, 4, 8, 6), // A strict subset of the dst bounds.
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image.Rect(-3, -5, 2, 4), // Partial out-of-bounds #0.
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image.Rect(4, -2, 6, 12), // Partial out-of-bounds #1.
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image.Rect(12, 14, 23, 45), // Complete out-of-bounds.
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image.Rect(5, 5, 5, 5), // Empty.
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}
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srs := []image.Rectangle{
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image.Rect(0, 0, 12, 9), // The src bounds.
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image.Rect(2, 2, 10, 8), // A strict subset of the src bounds.
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image.Rect(10, 5, 20, 20), // Partial out-of-bounds #0.
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image.Rect(-40, 0, 40, 8), // Partial out-of-bounds #1.
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image.Rect(-8, -8, -4, -4), // Complete out-of-bounds.
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image.Rect(5, 5, 5, 5), // Empty.
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}
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srcfs := []func(image.Rectangle) (image.Image, error){
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srcGray,
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srcNRGBA,
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srcRGBA,
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srcUnif,
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srcYCbCr,
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}
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var srcs []image.Image
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for _, srcf := range srcfs {
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src, err := srcf(srs[0])
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if err != nil {
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t.Fatal(err)
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}
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srcs = append(srcs, src)
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}
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qs := []Interpolator{
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NearestNeighbor,
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ApproxBiLinear,
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CatmullRom,
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}
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ops := []Op{
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Over,
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Src,
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}
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blue := image.NewUniform(color.RGBA{0x11, 0x22, 0x44, 0x7f})
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for _, dr := range drs {
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for _, src := range srcs {
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for _, sr := range srs {
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for _, transform := range []bool{false, true} {
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for _, q := range qs {
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for _, op := range ops {
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dst0 := image.NewRGBA(drs[0])
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dst1 := image.NewRGBA(drs[0])
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Draw(dst0, dst0.Bounds(), blue, image.Point{}, Src)
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Draw(dstWrapper{dst1}, dst1.Bounds(), srcWrapper{blue}, image.Point{}, Src)
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if transform {
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m := transformMatrix(3.75, 2, 1)
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q.Transform(dst0, m, src, sr, op, nil)
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q.Transform(dstWrapper{dst1}, m, srcWrapper{src}, sr, op, nil)
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} else {
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q.Scale(dst0, dr, src, sr, op, nil)
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q.Scale(dstWrapper{dst1}, dr, srcWrapper{src}, sr, op, nil)
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}
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if !bytes.Equal(dst0.Pix, dst1.Pix) {
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t.Errorf("pix differ for dr=%v, src=%T, sr=%v, transform=%t, q=%T",
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dr, src, sr, transform, q)
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}
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}
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}
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}
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}
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}
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}
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}
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