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// 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 image
import (
"image/color"
"image/color/palette"
"testing"
)
type image interface {
Image
Opaque() bool
Set(int, int, color.Color)
SubImage(Rectangle) Image
}
func cmp(cm color.Model, c0, c1 color.Color) bool {
r0, g0, b0, a0 := cm.Convert(c0).RGBA()
r1, g1, b1, a1 := cm.Convert(c1).RGBA()
return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
}
var testImages = []struct {
name string
image func() image
}{
{"rgba", func() image { return NewRGBA(Rect(0, 0, 10, 10)) }},
{"rgba64", func() image { return NewRGBA64(Rect(0, 0, 10, 10)) }},
{"nrgba", func() image { return NewNRGBA(Rect(0, 0, 10, 10)) }},
{"nrgba64", func() image { return NewNRGBA64(Rect(0, 0, 10, 10)) }},
{"alpha", func() image { return NewAlpha(Rect(0, 0, 10, 10)) }},
{"alpha16", func() image { return NewAlpha16(Rect(0, 0, 10, 10)) }},
{"gray", func() image { return NewGray(Rect(0, 0, 10, 10)) }},
{"gray16", func() image { return NewGray16(Rect(0, 0, 10, 10)) }},
{"paletted", func() image {
return NewPaletted(Rect(0, 0, 10, 10), color.Palette{
Transparent,
Opaque,
})
}},
}
func TestImage(t *testing.T) {
for _, tc := range testImages {
m := tc.image()
if !Rect(0, 0, 10, 10).Eq(m.Bounds()) {
t.Errorf("%T: want bounds %v, got %v", m, Rect(0, 0, 10, 10), m.Bounds())
continue
}
if !cmp(m.ColorModel(), Transparent, m.At(6, 3)) {
t.Errorf("%T: at (6, 3), want a zero color, got %v", m, m.At(6, 3))
continue
}
m.Set(6, 3, Opaque)
if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) {
t.Errorf("%T: at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
continue
}
if !m.SubImage(Rect(6, 3, 7, 4)).(image).Opaque() {
t.Errorf("%T: at (6, 3) was not opaque", m)
continue
}
m = m.SubImage(Rect(3, 2, 9, 8)).(image)
if !Rect(3, 2, 9, 8).Eq(m.Bounds()) {
t.Errorf("%T: sub-image want bounds %v, got %v", m, Rect(3, 2, 9, 8), m.Bounds())
continue
}
if !cmp(m.ColorModel(), Opaque, m.At(6, 3)) {
t.Errorf("%T: sub-image at (6, 3), want a non-zero color, got %v", m, m.At(6, 3))
continue
}
if !cmp(m.ColorModel(), Transparent, m.At(3, 3)) {
t.Errorf("%T: sub-image at (3, 3), want a zero color, got %v", m, m.At(3, 3))
continue
}
m.Set(3, 3, Opaque)
if !cmp(m.ColorModel(), Opaque, m.At(3, 3)) {
t.Errorf("%T: sub-image at (3, 3), want a non-zero color, got %v", m, m.At(3, 3))
continue
}
// Test that taking an empty sub-image starting at a corner does not panic.
m.SubImage(Rect(0, 0, 0, 0))
m.SubImage(Rect(10, 0, 10, 0))
m.SubImage(Rect(0, 10, 0, 10))
m.SubImage(Rect(10, 10, 10, 10))
}
}
func TestNewXxxBadRectangle(t *testing.T) {
// call calls f(r) and reports whether it ran without panicking.
call := func(f func(Rectangle), r Rectangle) (ok bool) {
defer func() {
if recover() != nil {
ok = false
}
}()
f(r)
return true
}
testCases := []struct {
name string
f func(Rectangle)
}{
{"RGBA", func(r Rectangle) { NewRGBA(r) }},
{"RGBA64", func(r Rectangle) { NewRGBA64(r) }},
{"NRGBA", func(r Rectangle) { NewNRGBA(r) }},
{"NRGBA64", func(r Rectangle) { NewNRGBA64(r) }},
{"Alpha", func(r Rectangle) { NewAlpha(r) }},
{"Alpha16", func(r Rectangle) { NewAlpha16(r) }},
{"Gray", func(r Rectangle) { NewGray(r) }},
{"Gray16", func(r Rectangle) { NewGray16(r) }},
{"CMYK", func(r Rectangle) { NewCMYK(r) }},
{"Paletted", func(r Rectangle) { NewPaletted(r, color.Palette{color.Black, color.White}) }},
{"YCbCr", func(r Rectangle) { NewYCbCr(r, YCbCrSubsampleRatio422) }},
{"NYCbCrA", func(r Rectangle) { NewNYCbCrA(r, YCbCrSubsampleRatio444) }},
}
for _, tc := range testCases {
// Calling NewXxx(r) should fail (panic, since NewXxx doesn't return an
// error) unless r's width and height are both non-negative.
for _, negDx := range []bool{false, true} {
for _, negDy := range []bool{false, true} {
r := Rectangle{
Min: Point{15, 28},
Max: Point{16, 29},
}
if negDx {
r.Max.X = 14
}
if negDy {
r.Max.Y = 27
}
got := call(tc.f, r)
want := !negDx && !negDy
if got != want {
t.Errorf("New%s: negDx=%t, negDy=%t: got %t, want %t",
tc.name, negDx, negDy, got, want)
}
}
}
// Passing a Rectangle whose width and height is MaxInt should also fail
// (panic), due to overflow.
{
zeroAsUint := uint(0)
maxUint := zeroAsUint - 1
maxInt := int(maxUint / 2)
got := call(tc.f, Rectangle{
Min: Point{0, 0},
Max: Point{maxInt, maxInt},
})
if got {
t.Errorf("New%s: overflow: got ok, want !ok", tc.name)
}
}
}
}
func Test16BitsPerColorChannel(t *testing.T) {
testColorModel := []color.Model{
color.RGBA64Model,
color.NRGBA64Model,
color.Alpha16Model,
color.Gray16Model,
}
for _, cm := range testColorModel {
c := cm.Convert(color.RGBA64{0x1234, 0x1234, 0x1234, 0x1234}) // Premultiplied alpha.
r, _, _, _ := c.RGBA()
if r != 0x1234 {
t.Errorf("%T: want red value 0x%04x got 0x%04x", c, 0x1234, r)
continue
}
}
testImage := []image{
NewRGBA64(Rect(0, 0, 10, 10)),
NewNRGBA64(Rect(0, 0, 10, 10)),
NewAlpha16(Rect(0, 0, 10, 10)),
NewGray16(Rect(0, 0, 10, 10)),
}
for _, m := range testImage {
m.Set(1, 2, color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}) // Non-premultiplied alpha.
r, _, _, _ := m.At(1, 2).RGBA()
if r != 0x1357 {
t.Errorf("%T: want red value 0x%04x got 0x%04x", m, 0x1357, r)
continue
}
}
}
func TestRGBA64Image(t *testing.T) {
// memset sets every element of s to v.
memset := func(s []byte, v byte) {
for i := range s {
s[i] = v
}
}
r := Rect(0, 0, 3, 2)
testCases := []Image{
NewAlpha(r),
NewAlpha16(r),
NewCMYK(r),
NewGray(r),
NewGray16(r),
NewNRGBA(r),
NewNRGBA64(r),
NewNYCbCrA(r, YCbCrSubsampleRatio444),
NewPaletted(r, palette.Plan9),
NewRGBA(r),
NewRGBA64(r),
NewUniform(color.RGBA64{}),
NewYCbCr(r, YCbCrSubsampleRatio444),
r,
}
for _, tc := range testCases {
switch tc := tc.(type) {
// Most of the concrete image types in the testCases implement the
// draw.RGBA64Image interface: they have a SetRGBA64 method. We use an
// interface literal here, instead of importing "image/draw", to avoid
// an import cycle.
//
// The YCbCr and NYCbCrA types are special-cased. Chroma subsampling
// means that setting one pixel can modify neighboring pixels. They
// don't have Set or SetRGBA64 methods because that side effect could
// be surprising. Here, we just memset the channel buffers instead.
//
// The Uniform and Rectangle types are also special-cased, as they
// don't have a Set or SetRGBA64 method.
case interface {
SetRGBA64(x, y int, c color.RGBA64)
}:
tc.SetRGBA64(1, 1, color.RGBA64{0x7FFF, 0x3FFF, 0x0000, 0x7FFF})
case *NYCbCrA:
memset(tc.YCbCr.Y, 0x77)
memset(tc.YCbCr.Cb, 0x88)
memset(tc.YCbCr.Cr, 0x99)
memset(tc.A, 0xAA)
case *Uniform:
tc.C = color.RGBA64{0x7FFF, 0x3FFF, 0x0000, 0x7FFF}
case *YCbCr:
memset(tc.Y, 0x77)
memset(tc.Cb, 0x88)
memset(tc.Cr, 0x99)
case Rectangle:
// No-op. Rectangle pixels' colors are immutable. They're always
// color.Opaque.
default:
t.Errorf("could not initialize pixels for %T", tc)
continue
}
// Check that RGBA64At(x, y) is equivalent to At(x, y).RGBA().
rgba64Image, ok := tc.(RGBA64Image)
if !ok {
t.Errorf("%T is not an RGBA64Image", tc)
continue
}
got := rgba64Image.RGBA64At(1, 1)
wantR, wantG, wantB, wantA := tc.At(1, 1).RGBA()
if (uint32(got.R) != wantR) || (uint32(got.G) != wantG) ||
(uint32(got.B) != wantB) || (uint32(got.A) != wantA) {
t.Errorf("%T:\ngot (0x%04X, 0x%04X, 0x%04X, 0x%04X)\n"+
"want (0x%04X, 0x%04X, 0x%04X, 0x%04X)", tc,
got.R, got.G, got.B, got.A,
wantR, wantG, wantB, wantA)
continue
}
}
}
func BenchmarkAt(b *testing.B) {
for _, tc := range testImages {
b.Run(tc.name, func(b *testing.B) {
m := tc.image()
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.At(4, 5)
}
})
}
}
func BenchmarkSet(b *testing.B) {
c := color.Gray{0xff}
for _, tc := range testImages {
b.Run(tc.name, func(b *testing.B) {
m := tc.image()
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.Set(4, 5, c)
}
})
}
}
func BenchmarkRGBAAt(b *testing.B) {
m := NewRGBA(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.RGBAAt(4, 5)
}
}
func BenchmarkRGBASetRGBA(b *testing.B) {
m := NewRGBA(Rect(0, 0, 10, 10))
c := color.RGBA{0xff, 0xff, 0xff, 0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetRGBA(4, 5, c)
}
}
func BenchmarkRGBA64At(b *testing.B) {
m := NewRGBA64(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.RGBA64At(4, 5)
}
}
func BenchmarkRGBA64SetRGBA64(b *testing.B) {
m := NewRGBA64(Rect(0, 0, 10, 10))
c := color.RGBA64{0xffff, 0xffff, 0xffff, 0x1357}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetRGBA64(4, 5, c)
}
}
func BenchmarkNRGBAAt(b *testing.B) {
m := NewNRGBA(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.NRGBAAt(4, 5)
}
}
func BenchmarkNRGBASetNRGBA(b *testing.B) {
m := NewNRGBA(Rect(0, 0, 10, 10))
c := color.NRGBA{0xff, 0xff, 0xff, 0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetNRGBA(4, 5, c)
}
}
func BenchmarkNRGBA64At(b *testing.B) {
m := NewNRGBA64(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.NRGBA64At(4, 5)
}
}
func BenchmarkNRGBA64SetNRGBA64(b *testing.B) {
m := NewNRGBA64(Rect(0, 0, 10, 10))
c := color.NRGBA64{0xffff, 0xffff, 0xffff, 0x1357}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetNRGBA64(4, 5, c)
}
}
func BenchmarkAlphaAt(b *testing.B) {
m := NewAlpha(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.AlphaAt(4, 5)
}
}
func BenchmarkAlphaSetAlpha(b *testing.B) {
m := NewAlpha(Rect(0, 0, 10, 10))
c := color.Alpha{0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetAlpha(4, 5, c)
}
}
func BenchmarkAlpha16At(b *testing.B) {
m := NewAlpha16(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.Alpha16At(4, 5)
}
}
func BenchmarkAlphaSetAlpha16(b *testing.B) {
m := NewAlpha16(Rect(0, 0, 10, 10))
c := color.Alpha16{0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetAlpha16(4, 5, c)
}
}
func BenchmarkGrayAt(b *testing.B) {
m := NewGray(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.GrayAt(4, 5)
}
}
func BenchmarkGraySetGray(b *testing.B) {
m := NewGray(Rect(0, 0, 10, 10))
c := color.Gray{0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetGray(4, 5, c)
}
}
func BenchmarkGray16At(b *testing.B) {
m := NewGray16(Rect(0, 0, 10, 10))
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.Gray16At(4, 5)
}
}
func BenchmarkGraySetGray16(b *testing.B) {
m := NewGray16(Rect(0, 0, 10, 10))
c := color.Gray16{0x13}
b.ResetTimer()
for i := 0; i < b.N; i++ {
m.SetGray16(4, 5, c)
}
}