746 lines
23 KiB
Go
746 lines
23 KiB
Go
// Copyright 2010 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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package draw
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import (
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"image"
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"image/color"
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"image/png"
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"os"
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"testing"
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"testing/quick"
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)
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// slowestRGBA is a draw.Image like image.RGBA but it is a different type and
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// therefore does not trigger the draw.go fastest code paths.
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//
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// Unlike slowerRGBA, it does not implement the draw.RGBA64Image interface.
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type slowestRGBA struct {
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Pix []uint8
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Stride int
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Rect image.Rectangle
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}
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func (p *slowestRGBA) ColorModel() color.Model { return color.RGBAModel }
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func (p *slowestRGBA) Bounds() image.Rectangle { return p.Rect }
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func (p *slowestRGBA) At(x, y int) color.Color {
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return p.RGBA64At(x, y)
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}
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func (p *slowestRGBA) RGBA64At(x, y int) color.RGBA64 {
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if !(image.Point{x, y}.In(p.Rect)) {
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return color.RGBA64{}
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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r := uint16(s[0])
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g := uint16(s[1])
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b := uint16(s[2])
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a := uint16(s[3])
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return color.RGBA64{
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(r << 8) | r,
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(g << 8) | g,
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(b << 8) | b,
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(a << 8) | a,
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}
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}
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func (p *slowestRGBA) Set(x, y int, c color.Color) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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c1 := color.RGBAModel.Convert(c).(color.RGBA)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = c1.R
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s[1] = c1.G
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s[2] = c1.B
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s[3] = c1.A
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}
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func (p *slowestRGBA) PixOffset(x, y int) int {
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return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4
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}
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func convertToSlowestRGBA(m image.Image) *slowestRGBA {
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if rgba, ok := m.(*image.RGBA); ok {
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return &slowestRGBA{
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Pix: append([]byte(nil), rgba.Pix...),
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Stride: rgba.Stride,
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Rect: rgba.Rect,
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}
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}
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rgba := image.NewRGBA(m.Bounds())
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Draw(rgba, rgba.Bounds(), m, m.Bounds().Min, Src)
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return &slowestRGBA{
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Pix: rgba.Pix,
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Stride: rgba.Stride,
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Rect: rgba.Rect,
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}
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}
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func init() {
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var p any = (*slowestRGBA)(nil)
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if _, ok := p.(RGBA64Image); ok {
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panic("slowestRGBA should not be an RGBA64Image")
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}
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}
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// slowerRGBA is a draw.Image like image.RGBA but it is a different type and
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// therefore does not trigger the draw.go fastest code paths.
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//
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// Unlike slowestRGBA, it still implements the draw.RGBA64Image interface.
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type slowerRGBA struct {
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Pix []uint8
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Stride int
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Rect image.Rectangle
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}
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func (p *slowerRGBA) ColorModel() color.Model { return color.RGBAModel }
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func (p *slowerRGBA) Bounds() image.Rectangle { return p.Rect }
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func (p *slowerRGBA) At(x, y int) color.Color {
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return p.RGBA64At(x, y)
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}
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func (p *slowerRGBA) RGBA64At(x, y int) color.RGBA64 {
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if !(image.Point{x, y}.In(p.Rect)) {
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return color.RGBA64{}
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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r := uint16(s[0])
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g := uint16(s[1])
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b := uint16(s[2])
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a := uint16(s[3])
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return color.RGBA64{
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(r << 8) | r,
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(g << 8) | g,
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(b << 8) | b,
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(a << 8) | a,
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}
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}
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func (p *slowerRGBA) Set(x, y int, c color.Color) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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c1 := color.RGBAModel.Convert(c).(color.RGBA)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = c1.R
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s[1] = c1.G
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s[2] = c1.B
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s[3] = c1.A
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}
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func (p *slowerRGBA) SetRGBA64(x, y int, c color.RGBA64) {
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if !(image.Point{x, y}.In(p.Rect)) {
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return
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}
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i := p.PixOffset(x, y)
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s := p.Pix[i : i+4 : i+4] // Small cap improves performance, see https://golang.org/issue/27857
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s[0] = uint8(c.R >> 8)
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s[1] = uint8(c.G >> 8)
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s[2] = uint8(c.B >> 8)
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s[3] = uint8(c.A >> 8)
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}
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func (p *slowerRGBA) PixOffset(x, y int) int {
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return (y-p.Rect.Min.Y)*p.Stride + (x-p.Rect.Min.X)*4
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}
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func convertToSlowerRGBA(m image.Image) *slowerRGBA {
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if rgba, ok := m.(*image.RGBA); ok {
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return &slowerRGBA{
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Pix: append([]byte(nil), rgba.Pix...),
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Stride: rgba.Stride,
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Rect: rgba.Rect,
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}
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}
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rgba := image.NewRGBA(m.Bounds())
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Draw(rgba, rgba.Bounds(), m, m.Bounds().Min, Src)
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return &slowerRGBA{
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Pix: rgba.Pix,
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Stride: rgba.Stride,
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Rect: rgba.Rect,
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}
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}
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func init() {
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var p any = (*slowerRGBA)(nil)
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if _, ok := p.(RGBA64Image); !ok {
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panic("slowerRGBA should be an RGBA64Image")
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}
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}
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func eq(c0, c1 color.Color) bool {
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r0, g0, b0, a0 := c0.RGBA()
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r1, g1, b1, a1 := c1.RGBA()
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return r0 == r1 && g0 == g1 && b0 == b1 && a0 == a1
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}
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func fillBlue(alpha int) image.Image {
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return image.NewUniform(color.RGBA{0, 0, uint8(alpha), uint8(alpha)})
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}
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func fillAlpha(alpha int) image.Image {
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return image.NewUniform(color.Alpha{uint8(alpha)})
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}
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func vgradGreen(alpha int) image.Image {
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m := image.NewRGBA(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.RGBA{0, uint8(y * alpha / 15), 0, uint8(alpha)})
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}
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}
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return m
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}
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func vgradAlpha(alpha int) image.Image {
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m := image.NewAlpha(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.Alpha{uint8(y * alpha / 15)})
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}
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}
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return m
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}
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func vgradGreenNRGBA(alpha int) image.Image {
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m := image.NewNRGBA(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.RGBA{0, uint8(y * 0x11), 0, uint8(alpha)})
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}
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}
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return m
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}
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func vgradCr() image.Image {
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m := &image.YCbCr{
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Y: make([]byte, 16*16),
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Cb: make([]byte, 16*16),
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Cr: make([]byte, 16*16),
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YStride: 16,
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CStride: 16,
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SubsampleRatio: image.YCbCrSubsampleRatio444,
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Rect: image.Rect(0, 0, 16, 16),
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}
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Cr[y*m.CStride+x] = uint8(y * 0x11)
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}
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}
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return m
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}
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func vgradGray() image.Image {
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m := image.NewGray(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.Gray{uint8(y * 0x11)})
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}
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}
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return m
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}
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func vgradMagenta() image.Image {
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m := image.NewCMYK(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.CMYK{0, uint8(y * 0x11), 0, 0x3f})
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}
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}
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return m
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}
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func hgradRed(alpha int) Image {
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m := image.NewRGBA(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.RGBA{uint8(x * alpha / 15), 0, 0, uint8(alpha)})
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}
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}
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return m
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}
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func gradYellow(alpha int) Image {
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m := image.NewRGBA(image.Rect(0, 0, 16, 16))
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for y := 0; y < 16; y++ {
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for x := 0; x < 16; x++ {
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m.Set(x, y, color.RGBA{uint8(x * alpha / 15), uint8(y * alpha / 15), 0, uint8(alpha)})
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}
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}
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return m
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}
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type drawTest struct {
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desc string
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src image.Image
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mask image.Image
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op Op
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expected color.Color
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}
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var drawTests = []drawTest{
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// Uniform mask (0% opaque).
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{"nop", vgradGreen(255), fillAlpha(0), Over, color.RGBA{136, 0, 0, 255}},
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{"clear", vgradGreen(255), fillAlpha(0), Src, color.RGBA{0, 0, 0, 0}},
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// Uniform mask (100%, 75%, nil) and uniform source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 0, 90, 90}.
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{"fill", fillBlue(90), fillAlpha(255), Over, color.RGBA{88, 0, 90, 255}},
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{"fillSrc", fillBlue(90), fillAlpha(255), Src, color.RGBA{0, 0, 90, 90}},
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{"fillAlpha", fillBlue(90), fillAlpha(192), Over, color.RGBA{100, 0, 68, 255}},
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{"fillAlphaSrc", fillBlue(90), fillAlpha(192), Src, color.RGBA{0, 0, 68, 68}},
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{"fillNil", fillBlue(90), nil, Over, color.RGBA{88, 0, 90, 255}},
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{"fillNilSrc", fillBlue(90), nil, Src, color.RGBA{0, 0, 90, 90}},
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// Uniform mask (100%, 75%, nil) and variable source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 48, 0, 90}.
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{"copy", vgradGreen(90), fillAlpha(255), Over, color.RGBA{88, 48, 0, 255}},
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{"copySrc", vgradGreen(90), fillAlpha(255), Src, color.RGBA{0, 48, 0, 90}},
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{"copyAlpha", vgradGreen(90), fillAlpha(192), Over, color.RGBA{100, 36, 0, 255}},
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{"copyAlphaSrc", vgradGreen(90), fillAlpha(192), Src, color.RGBA{0, 36, 0, 68}},
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{"copyNil", vgradGreen(90), nil, Over, color.RGBA{88, 48, 0, 255}},
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{"copyNilSrc", vgradGreen(90), nil, Src, color.RGBA{0, 48, 0, 90}},
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// Uniform mask (100%, 75%, nil) and variable NRGBA source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 136, 0, 90} in NRGBA-space, which is {0, 48, 0, 90} in RGBA-space.
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// The result pixel is different than in the "copy*" test cases because of rounding errors.
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{"nrgba", vgradGreenNRGBA(90), fillAlpha(255), Over, color.RGBA{88, 46, 0, 255}},
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{"nrgbaSrc", vgradGreenNRGBA(90), fillAlpha(255), Src, color.RGBA{0, 46, 0, 90}},
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{"nrgbaAlpha", vgradGreenNRGBA(90), fillAlpha(192), Over, color.RGBA{100, 34, 0, 255}},
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{"nrgbaAlphaSrc", vgradGreenNRGBA(90), fillAlpha(192), Src, color.RGBA{0, 34, 0, 68}},
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{"nrgbaNil", vgradGreenNRGBA(90), nil, Over, color.RGBA{88, 46, 0, 255}},
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{"nrgbaNilSrc", vgradGreenNRGBA(90), nil, Src, color.RGBA{0, 46, 0, 90}},
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// Uniform mask (100%, 75%, nil) and variable YCbCr source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 0, 136} in YCbCr-space, which is {11, 38, 0, 255} in RGB-space.
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{"ycbcr", vgradCr(), fillAlpha(255), Over, color.RGBA{11, 38, 0, 255}},
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{"ycbcrSrc", vgradCr(), fillAlpha(255), Src, color.RGBA{11, 38, 0, 255}},
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{"ycbcrAlpha", vgradCr(), fillAlpha(192), Over, color.RGBA{42, 28, 0, 255}},
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{"ycbcrAlphaSrc", vgradCr(), fillAlpha(192), Src, color.RGBA{8, 28, 0, 192}},
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{"ycbcrNil", vgradCr(), nil, Over, color.RGBA{11, 38, 0, 255}},
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{"ycbcrNilSrc", vgradCr(), nil, Src, color.RGBA{11, 38, 0, 255}},
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// Uniform mask (100%, 75%, nil) and variable Gray source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {136} in Gray-space, which is {136, 136, 136, 255} in RGBA-space.
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{"gray", vgradGray(), fillAlpha(255), Over, color.RGBA{136, 136, 136, 255}},
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{"graySrc", vgradGray(), fillAlpha(255), Src, color.RGBA{136, 136, 136, 255}},
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{"grayAlpha", vgradGray(), fillAlpha(192), Over, color.RGBA{136, 102, 102, 255}},
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{"grayAlphaSrc", vgradGray(), fillAlpha(192), Src, color.RGBA{102, 102, 102, 192}},
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{"grayNil", vgradGray(), nil, Over, color.RGBA{136, 136, 136, 255}},
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{"grayNilSrc", vgradGray(), nil, Src, color.RGBA{136, 136, 136, 255}},
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// Same again, but with a slowerRGBA source.
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{"graySlower", convertToSlowerRGBA(vgradGray()), fillAlpha(255),
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Over, color.RGBA{136, 136, 136, 255}},
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{"graySrcSlower", convertToSlowerRGBA(vgradGray()), fillAlpha(255),
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Src, color.RGBA{136, 136, 136, 255}},
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{"grayAlphaSlower", convertToSlowerRGBA(vgradGray()), fillAlpha(192),
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Over, color.RGBA{136, 102, 102, 255}},
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{"grayAlphaSrcSlower", convertToSlowerRGBA(vgradGray()), fillAlpha(192),
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Src, color.RGBA{102, 102, 102, 192}},
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{"grayNilSlower", convertToSlowerRGBA(vgradGray()), nil,
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Over, color.RGBA{136, 136, 136, 255}},
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{"grayNilSrcSlower", convertToSlowerRGBA(vgradGray()), nil,
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Src, color.RGBA{136, 136, 136, 255}},
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// Same again, but with a slowestRGBA source.
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{"graySlowest", convertToSlowestRGBA(vgradGray()), fillAlpha(255),
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Over, color.RGBA{136, 136, 136, 255}},
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{"graySrcSlowest", convertToSlowestRGBA(vgradGray()), fillAlpha(255),
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Src, color.RGBA{136, 136, 136, 255}},
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{"grayAlphaSlowest", convertToSlowestRGBA(vgradGray()), fillAlpha(192),
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Over, color.RGBA{136, 102, 102, 255}},
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{"grayAlphaSrcSlowest", convertToSlowestRGBA(vgradGray()), fillAlpha(192),
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Src, color.RGBA{102, 102, 102, 192}},
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{"grayNilSlowest", convertToSlowestRGBA(vgradGray()), nil,
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Over, color.RGBA{136, 136, 136, 255}},
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{"grayNilSrcSlowest", convertToSlowestRGBA(vgradGray()), nil,
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Src, color.RGBA{136, 136, 136, 255}},
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// Uniform mask (100%, 75%, nil) and variable CMYK source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 136, 0, 63} in CMYK-space, which is {192, 89, 192} in RGB-space.
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{"cmyk", vgradMagenta(), fillAlpha(255), Over, color.RGBA{192, 89, 192, 255}},
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{"cmykSrc", vgradMagenta(), fillAlpha(255), Src, color.RGBA{192, 89, 192, 255}},
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{"cmykAlpha", vgradMagenta(), fillAlpha(192), Over, color.RGBA{178, 67, 145, 255}},
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{"cmykAlphaSrc", vgradMagenta(), fillAlpha(192), Src, color.RGBA{145, 67, 145, 192}},
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{"cmykNil", vgradMagenta(), nil, Over, color.RGBA{192, 89, 192, 255}},
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{"cmykNilSrc", vgradMagenta(), nil, Src, color.RGBA{192, 89, 192, 255}},
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// Variable mask and uniform source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is {0, 0, 255, 255}.
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// The mask pixel's alpha is 102, or 40%.
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{"generic", fillBlue(255), vgradAlpha(192), Over, color.RGBA{81, 0, 102, 255}},
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{"genericSrc", fillBlue(255), vgradAlpha(192), Src, color.RGBA{0, 0, 102, 102}},
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// Same again, but with a slowerRGBA mask.
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{"genericSlower", fillBlue(255), convertToSlowerRGBA(vgradAlpha(192)),
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Over, color.RGBA{81, 0, 102, 255}},
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{"genericSrcSlower", fillBlue(255), convertToSlowerRGBA(vgradAlpha(192)),
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Src, color.RGBA{0, 0, 102, 102}},
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// Same again, but with a slowestRGBA mask.
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{"genericSlowest", fillBlue(255), convertToSlowestRGBA(vgradAlpha(192)),
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Over, color.RGBA{81, 0, 102, 255}},
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{"genericSrcSlowest", fillBlue(255), convertToSlowestRGBA(vgradAlpha(192)),
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Src, color.RGBA{0, 0, 102, 102}},
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// Variable mask and variable source.
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// At (x, y) == (8, 8):
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// The destination pixel is {136, 0, 0, 255}.
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// The source pixel is:
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// - {0, 48, 0, 90}.
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// - {136} in Gray-space, which is {136, 136, 136, 255} in RGBA-space.
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|
// The mask pixel's alpha is 102, or 40%.
|
|
{"rgbaVariableMaskOver", vgradGreen(90), vgradAlpha(192), Over, color.RGBA{117, 19, 0, 255}},
|
|
{"grayVariableMaskOver", vgradGray(), vgradAlpha(192), Over, color.RGBA{136, 54, 54, 255}},
|
|
}
|
|
|
|
func makeGolden(dst image.Image, r image.Rectangle, src image.Image, sp image.Point, mask image.Image, mp image.Point, op Op) image.Image {
|
|
// Since golden is a newly allocated image, we don't have to check if the
|
|
// input source and mask images and the output golden image overlap.
|
|
b := dst.Bounds()
|
|
sb := src.Bounds()
|
|
mb := image.Rect(-1e9, -1e9, 1e9, 1e9)
|
|
if mask != nil {
|
|
mb = mask.Bounds()
|
|
}
|
|
golden := image.NewRGBA(image.Rect(0, 0, b.Max.X, b.Max.Y))
|
|
for y := r.Min.Y; y < r.Max.Y; y++ {
|
|
sy := y + sp.Y - r.Min.Y
|
|
my := y + mp.Y - r.Min.Y
|
|
for x := r.Min.X; x < r.Max.X; x++ {
|
|
if !(image.Pt(x, y).In(b)) {
|
|
continue
|
|
}
|
|
sx := x + sp.X - r.Min.X
|
|
if !(image.Pt(sx, sy).In(sb)) {
|
|
continue
|
|
}
|
|
mx := x + mp.X - r.Min.X
|
|
if !(image.Pt(mx, my).In(mb)) {
|
|
continue
|
|
}
|
|
|
|
const M = 1<<16 - 1
|
|
var dr, dg, db, da uint32
|
|
if op == Over {
|
|
dr, dg, db, da = dst.At(x, y).RGBA()
|
|
}
|
|
sr, sg, sb, sa := src.At(sx, sy).RGBA()
|
|
ma := uint32(M)
|
|
if mask != nil {
|
|
_, _, _, ma = mask.At(mx, my).RGBA()
|
|
}
|
|
a := M - (sa * ma / M)
|
|
golden.Set(x, y, color.RGBA64{
|
|
uint16((dr*a + sr*ma) / M),
|
|
uint16((dg*a + sg*ma) / M),
|
|
uint16((db*a + sb*ma) / M),
|
|
uint16((da*a + sa*ma) / M),
|
|
})
|
|
}
|
|
}
|
|
return golden.SubImage(b)
|
|
}
|
|
|
|
func TestDraw(t *testing.T) {
|
|
rr := []image.Rectangle{
|
|
image.Rect(0, 0, 0, 0),
|
|
image.Rect(0, 0, 16, 16),
|
|
image.Rect(3, 5, 12, 10),
|
|
image.Rect(0, 0, 9, 9),
|
|
image.Rect(8, 8, 16, 16),
|
|
image.Rect(8, 0, 9, 16),
|
|
image.Rect(0, 8, 16, 9),
|
|
image.Rect(8, 8, 9, 9),
|
|
image.Rect(8, 8, 8, 8),
|
|
}
|
|
for _, r := range rr {
|
|
loop:
|
|
for _, test := range drawTests {
|
|
for i := 0; i < 3; i++ {
|
|
dst := hgradRed(255).(*image.RGBA).SubImage(r).(Image)
|
|
// For i != 0, substitute a different-typed dst that will take
|
|
// us off the fastest code paths. We should still get the same
|
|
// result, in terms of final pixel RGBA values.
|
|
switch i {
|
|
case 1:
|
|
dst = convertToSlowerRGBA(dst)
|
|
case 2:
|
|
dst = convertToSlowestRGBA(dst)
|
|
}
|
|
|
|
// Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation.
|
|
golden := makeGolden(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
|
|
b := dst.Bounds()
|
|
if !b.Eq(golden.Bounds()) {
|
|
t.Errorf("draw %v %s on %T: bounds %v versus %v",
|
|
r, test.desc, dst, dst.Bounds(), golden.Bounds())
|
|
continue
|
|
}
|
|
// Draw the same combination onto the actual dst using the optimized DrawMask implementation.
|
|
DrawMask(dst, image.Rect(0, 0, 16, 16), test.src, image.ZP, test.mask, image.ZP, test.op)
|
|
if image.Pt(8, 8).In(r) {
|
|
// Check that the resultant pixel at (8, 8) matches what we expect
|
|
// (the expected value can be verified by hand).
|
|
if !eq(dst.At(8, 8), test.expected) {
|
|
t.Errorf("draw %v %s on %T: at (8, 8) %v versus %v",
|
|
r, test.desc, dst, dst.At(8, 8), test.expected)
|
|
continue
|
|
}
|
|
}
|
|
// Check that the resultant dst image matches the golden output.
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
if !eq(dst.At(x, y), golden.At(x, y)) {
|
|
t.Errorf("draw %v %s on %T: at (%d, %d), %v versus golden %v",
|
|
r, test.desc, dst, x, y, dst.At(x, y), golden.At(x, y))
|
|
continue loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestDrawOverlap(t *testing.T) {
|
|
for _, op := range []Op{Over, Src} {
|
|
for yoff := -2; yoff <= 2; yoff++ {
|
|
loop:
|
|
for xoff := -2; xoff <= 2; xoff++ {
|
|
m := gradYellow(127).(*image.RGBA)
|
|
dst := m.SubImage(image.Rect(5, 5, 10, 10)).(*image.RGBA)
|
|
src := m.SubImage(image.Rect(5+xoff, 5+yoff, 10+xoff, 10+yoff)).(*image.RGBA)
|
|
b := dst.Bounds()
|
|
// Draw the (src, mask, op) onto a copy of dst using a slow but obviously correct implementation.
|
|
golden := makeGolden(dst, b, src, src.Bounds().Min, nil, image.ZP, op)
|
|
if !b.Eq(golden.Bounds()) {
|
|
t.Errorf("drawOverlap xoff=%d,yoff=%d: bounds %v versus %v", xoff, yoff, dst.Bounds(), golden.Bounds())
|
|
continue
|
|
}
|
|
// Draw the same combination onto the actual dst using the optimized DrawMask implementation.
|
|
DrawMask(dst, b, src, src.Bounds().Min, nil, image.ZP, op)
|
|
// Check that the resultant dst image matches the golden output.
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
if !eq(dst.At(x, y), golden.At(x, y)) {
|
|
t.Errorf("drawOverlap xoff=%d,yoff=%d: at (%d, %d), %v versus golden %v", xoff, yoff, x, y, dst.At(x, y), golden.At(x, y))
|
|
continue loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// TestNonZeroSrcPt checks drawing with a non-zero src point parameter.
|
|
func TestNonZeroSrcPt(t *testing.T) {
|
|
a := image.NewRGBA(image.Rect(0, 0, 1, 1))
|
|
b := image.NewRGBA(image.Rect(0, 0, 2, 2))
|
|
b.Set(0, 0, color.RGBA{0, 0, 0, 5})
|
|
b.Set(1, 0, color.RGBA{0, 0, 5, 5})
|
|
b.Set(0, 1, color.RGBA{0, 5, 0, 5})
|
|
b.Set(1, 1, color.RGBA{5, 0, 0, 5})
|
|
Draw(a, image.Rect(0, 0, 1, 1), b, image.Pt(1, 1), Over)
|
|
if !eq(color.RGBA{5, 0, 0, 5}, a.At(0, 0)) {
|
|
t.Errorf("non-zero src pt: want %v got %v", color.RGBA{5, 0, 0, 5}, a.At(0, 0))
|
|
}
|
|
}
|
|
|
|
func TestFill(t *testing.T) {
|
|
rr := []image.Rectangle{
|
|
image.Rect(0, 0, 0, 0),
|
|
image.Rect(0, 0, 40, 30),
|
|
image.Rect(10, 0, 40, 30),
|
|
image.Rect(0, 20, 40, 30),
|
|
image.Rect(10, 20, 40, 30),
|
|
image.Rect(10, 20, 15, 25),
|
|
image.Rect(10, 0, 35, 30),
|
|
image.Rect(0, 15, 40, 16),
|
|
image.Rect(24, 24, 25, 25),
|
|
image.Rect(23, 23, 26, 26),
|
|
image.Rect(22, 22, 27, 27),
|
|
image.Rect(21, 21, 28, 28),
|
|
image.Rect(20, 20, 29, 29),
|
|
}
|
|
for _, r := range rr {
|
|
m := image.NewRGBA(image.Rect(0, 0, 40, 30)).SubImage(r).(*image.RGBA)
|
|
b := m.Bounds()
|
|
c := color.RGBA{11, 0, 0, 255}
|
|
src := &image.Uniform{C: c}
|
|
check := func(desc string) {
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
if !eq(c, m.At(x, y)) {
|
|
t.Errorf("%s fill: at (%d, %d), sub-image bounds=%v: want %v got %v", desc, x, y, r, c, m.At(x, y))
|
|
return
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Draw 1 pixel at a time.
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
DrawMask(m, image.Rect(x, y, x+1, y+1), src, image.ZP, nil, image.ZP, Src)
|
|
}
|
|
}
|
|
check("pixel")
|
|
// Draw 1 row at a time.
|
|
c = color.RGBA{0, 22, 0, 255}
|
|
src = &image.Uniform{C: c}
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
DrawMask(m, image.Rect(b.Min.X, y, b.Max.X, y+1), src, image.ZP, nil, image.ZP, Src)
|
|
}
|
|
check("row")
|
|
// Draw 1 column at a time.
|
|
c = color.RGBA{0, 0, 33, 255}
|
|
src = &image.Uniform{C: c}
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
DrawMask(m, image.Rect(x, b.Min.Y, x+1, b.Max.Y), src, image.ZP, nil, image.ZP, Src)
|
|
}
|
|
check("column")
|
|
// Draw the whole image at once.
|
|
c = color.RGBA{44, 55, 66, 77}
|
|
src = &image.Uniform{C: c}
|
|
DrawMask(m, b, src, image.ZP, nil, image.ZP, Src)
|
|
check("whole")
|
|
}
|
|
}
|
|
|
|
// TestFloydSteinbergCheckerboard tests that the result of Floyd-Steinberg
|
|
// error diffusion of a uniform 50% gray source image with a black-and-white
|
|
// palette is a checkerboard pattern.
|
|
func TestFloydSteinbergCheckerboard(t *testing.T) {
|
|
b := image.Rect(0, 0, 640, 480)
|
|
// We can't represent 50% exactly, but 0x7fff / 0xffff is close enough.
|
|
src := &image.Uniform{color.Gray16{0x7fff}}
|
|
dst := image.NewPaletted(b, color.Palette{color.Black, color.White})
|
|
FloydSteinberg.Draw(dst, b, src, image.Point{})
|
|
nErr := 0
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
got := dst.Pix[dst.PixOffset(x, y)]
|
|
want := uint8(x+y) % 2
|
|
if got != want {
|
|
t.Errorf("at (%d, %d): got %d, want %d", x, y, got, want)
|
|
if nErr++; nErr == 10 {
|
|
t.Fatal("there may be more errors")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// embeddedPaletted is an Image that behaves like an *image.Paletted but whose
|
|
// type is not *image.Paletted.
|
|
type embeddedPaletted struct {
|
|
*image.Paletted
|
|
}
|
|
|
|
// TestPaletted tests that the drawPaletted function behaves the same
|
|
// regardless of whether dst is an *image.Paletted.
|
|
func TestPaletted(t *testing.T) {
|
|
f, err := os.Open("../testdata/video-001.png")
|
|
if err != nil {
|
|
t.Fatalf("open: %v", err)
|
|
}
|
|
defer f.Close()
|
|
video001, err := png.Decode(f)
|
|
if err != nil {
|
|
t.Fatalf("decode: %v", err)
|
|
}
|
|
b := video001.Bounds()
|
|
|
|
cgaPalette := color.Palette{
|
|
color.RGBA{0x00, 0x00, 0x00, 0xff},
|
|
color.RGBA{0x55, 0xff, 0xff, 0xff},
|
|
color.RGBA{0xff, 0x55, 0xff, 0xff},
|
|
color.RGBA{0xff, 0xff, 0xff, 0xff},
|
|
}
|
|
drawers := map[string]Drawer{
|
|
"src": Src,
|
|
"floyd-steinberg": FloydSteinberg,
|
|
}
|
|
sources := map[string]image.Image{
|
|
"uniform": &image.Uniform{color.RGBA{0xff, 0x7f, 0xff, 0xff}},
|
|
"video001": video001,
|
|
}
|
|
|
|
for dName, d := range drawers {
|
|
loop:
|
|
for sName, src := range sources {
|
|
dst0 := image.NewPaletted(b, cgaPalette)
|
|
dst1 := image.NewPaletted(b, cgaPalette)
|
|
d.Draw(dst0, b, src, image.Point{})
|
|
d.Draw(embeddedPaletted{dst1}, b, src, image.Point{})
|
|
for y := b.Min.Y; y < b.Max.Y; y++ {
|
|
for x := b.Min.X; x < b.Max.X; x++ {
|
|
if !eq(dst0.At(x, y), dst1.At(x, y)) {
|
|
t.Errorf("%s / %s: at (%d, %d), %v versus %v",
|
|
dName, sName, x, y, dst0.At(x, y), dst1.At(x, y))
|
|
continue loop
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestSqDiff(t *testing.T) {
|
|
// This test is similar to the one from the image/color package, but
|
|
// sqDiff in this package accepts int32 instead of uint32, so test it
|
|
// for appropriate input.
|
|
|
|
// canonical sqDiff implementation
|
|
orig := func(x, y int32) uint32 {
|
|
var d uint32
|
|
if x > y {
|
|
d = uint32(x - y)
|
|
} else {
|
|
d = uint32(y - x)
|
|
}
|
|
return (d * d) >> 2
|
|
}
|
|
testCases := []int32{
|
|
0,
|
|
1,
|
|
2,
|
|
0x0fffd,
|
|
0x0fffe,
|
|
0x0ffff,
|
|
0x10000,
|
|
0x10001,
|
|
0x10002,
|
|
0x7ffffffd,
|
|
0x7ffffffe,
|
|
0x7fffffff,
|
|
-0x7ffffffd,
|
|
-0x7ffffffe,
|
|
-0x80000000,
|
|
}
|
|
for _, x := range testCases {
|
|
for _, y := range testCases {
|
|
if got, want := sqDiff(x, y), orig(x, y); got != want {
|
|
t.Fatalf("sqDiff(%#x, %#x): got %d, want %d", x, y, got, want)
|
|
}
|
|
}
|
|
}
|
|
if err := quick.CheckEqual(orig, sqDiff, &quick.Config{MaxCountScale: 10}); err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
}
|