ebiten/image_test.go

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// Copyright 2016 Hajime Hoshi
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ebiten_test
import (
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"errors"
"image"
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"image/color"
"image/draw"
_ "image/png"
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"math"
"os"
"testing"
. "github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
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emath "github.com/hajimehoshi/ebiten/internal/math"
)
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func TestMain(m *testing.M) {
code := 0
// Run an Ebiten process so that (*Image).At is available.
regularTermination := errors.New("regular termination")
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f := func(screen *Image) error {
code = m.Run()
return regularTermination
}
if err := Run(f, 320, 240, 1, "Test"); err != nil && err != regularTermination {
panic(err)
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}
os.Exit(code)
}
var ebitenImageBin = ""
func openImage(path string) (image.Image, error) {
file, err := readFile(path)
if err != nil {
return nil, err
}
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
return img, nil
}
func openEbitenImage(path string) (*Image, image.Image, error) {
img, err := openImage(path)
if err != nil {
return nil, nil, err
}
eimg, err := NewImageFromImage(img, FilterNearest)
if err != nil {
return nil, nil, err
}
return eimg, img, nil
}
func abs(x int) int {
if x < 0 {
return -x
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}
return x
}
// sameColors compares c1 and c2 and returns a boolean value indicating
// if the two colors are (almost) same.
//
// Pixels read from GPU might include errors (#492), and
// sameColors considers such errors as delta.
func sameColors(c1, c2 color.RGBA, delta int) bool {
return abs(int(c1.R)-int(c2.R)) <= delta &&
abs(int(c1.G)-int(c2.G)) <= delta &&
abs(int(c1.B)-int(c2.B)) <= delta &&
abs(int(c1.A)-int(c2.A)) <= delta
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}
func TestImagePixels(t *testing.T) {
img0, img, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
if got := img0.Bounds().Size(); got != img.Bounds().Size() {
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t.Fatalf("img size: got %d; want %d", got, img.Bounds().Size())
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}
w, h := img0.Bounds().Size().X, img0.Bounds().Size().Y
// Check out of range part
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w2, h2 := emath.NextPowerOf2Int(w), emath.NextPowerOf2Int(h)
for j := -100; j < h2+100; j++ {
for i := -100; i < w2+100; i++ {
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got := img0.At(i, j)
want := color.RGBAModel.Convert(img.At(i, j))
if got != want {
t.Errorf("img0 At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
func TestImageComposition(t *testing.T) {
img2Color := color.NRGBA{0x24, 0x3f, 0x6a, 0x88}
img3Color := color.NRGBA{0x85, 0xa3, 0x08, 0xd3}
// TODO: Rename this to img0
img1, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img1.Bounds().Size().X, img1.Bounds().Size().Y
img2, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
img3, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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if err := img2.Fill(img2Color); err != nil {
t.Fatal(err)
return
}
if err := img3.Fill(img3Color); err != nil {
t.Fatal(err)
return
}
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img_12_3, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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if err := img2.DrawImage(img1, nil); err != nil {
t.Fatal(err)
return
}
if err := img3.DrawImage(img2, nil); err != nil {
t.Fatal(err)
return
}
if err := img_12_3.DrawImage(img3, nil); err != nil {
t.Fatal(err)
return
}
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if err := img2.Fill(img2Color); err != nil {
t.Fatal(err)
return
}
if err := img3.Fill(img3Color); err != nil {
t.Fatal(err)
return
}
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img_1_23, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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if err := img3.DrawImage(img2, nil); err != nil {
t.Fatal(err)
return
}
if err := img3.DrawImage(img1, nil); err != nil {
t.Fatal(err)
return
}
if err := img_1_23.DrawImage(img3, nil); err != nil {
t.Fatal(err)
return
}
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for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
c1 := img_12_3.At(i, j).(color.RGBA)
c2 := img_1_23.At(i, j).(color.RGBA)
if !sameColors(c1, c2, 1) {
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t.Errorf("img_12_3.At(%d, %d) = %#v; img_1_23.At(%[1]d, %[2]d) = %#[4]v", i, j, c1, c2)
}
if c1.A == 0 {
t.Fatalf("img_12_3.At(%d, %d).A = 0; nothing is rendered?", i, j)
}
if c2.A == 0 {
t.Fatalf("img_1_23.At(%d, %d).A = 0; nothing is rendered?", i, j)
}
}
}
}
func TestImageSelf(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Errorf("DrawImage must panic but not")
}
}()
img, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
img.DrawImage(img, nil)
}
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func TestImageScale(t *testing.T) {
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for _, scale := range []int{2, 3, 4} {
img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Size()
img1, err := NewImage(w*scale, h*scale, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
op := &DrawImageOptions{}
op.GeoM.Scale(float64(scale), float64(scale))
if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
return
}
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for j := 0; j < h*scale; j++ {
for i := 0; i < w*scale; i++ {
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c0 := img0.At(i/scale, j/scale).(color.RGBA)
c1 := img1.At(i, j).(color.RGBA)
if c0 != c1 {
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t.Fatalf("img0.At(%[1]d, %[2]d) should equal to img1.At(%[3]d, %[4]d) (with scale %[5]d) but not: %[6]v vs %[7]v", i/2, j/2, i, j, scale, c0, c1)
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}
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}
}
}
}
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func TestImage90DegreeRotate(t *testing.T) {
img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Size()
img1, err := NewImage(h, w, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
op := &DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 2)
op.GeoM.Translate(float64(h), 0)
if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
return
}
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
c0 := img0.At(i, j).(color.RGBA)
c1 := img1.At(h-j-1, i).(color.RGBA)
if c0 != c1 {
t.Errorf("img0.At(%[1]d, %[2]d) should equal to img1.At(%[3]d, %[4]d) but not: %[5]v vs %[6]v", i, j, h-j-1, i, c0, c1)
}
}
}
}
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func TestImageDotByDotInversion(t *testing.T) {
img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Size()
img1, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
op := &DrawImageOptions{}
op.GeoM.Rotate(math.Pi)
op.GeoM.Translate(float64(w), float64(h))
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if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
return
}
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for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
c0 := img0.At(i, j).(color.RGBA)
c1 := img1.At(w-i-1, h-j-1).(color.RGBA)
if c0 != c1 {
t.Errorf("img0.At(%[1]d, %[2]d) should equal to img1.At(%[3]d, %[4]d) but not: %[5]v vs %[6]v", i, j, w-i-1, h-j-1, c0, c1)
}
}
}
}
func TestReplacePixels(t *testing.T) {
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// Create a dummy image so that the shared texture is used and origImg's position is shfited.
dummyImg, _ := NewImageFromImage(image.NewRGBA(image.Rect(0, 0, 16, 16)), FilterDefault)
defer dummyImg.Dispose()
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origImg, err := openImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
// Convert to RGBA
img := image.NewRGBA(origImg.Bounds())
draw.Draw(img, img.Bounds(), origImg, image.ZP, draw.Src)
size := img.Bounds().Size()
img0, err := NewImage(size.X, size.Y, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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if err := img0.ReplacePixels(img.Pix); err != nil {
t.Fatal(err)
return
}
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for j := 0; j < img0.Bounds().Size().Y; j++ {
for i := 0; i < img0.Bounds().Size().X; i++ {
got := img0.At(i, j)
want := img.At(i, j)
if got != want {
t.Errorf("img0 At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
p := make([]uint8, 4*size.X*size.Y)
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for i := range p {
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p[i] = 0x80
}
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if err := img0.ReplacePixels(p); err != nil {
t.Fatal(err)
return
}
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// Even if p is changed after calling ReplacePixel, img0 uses the original values.
for i := range p {
p[i] = 0
}
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for j := 0; j < img0.Bounds().Size().Y; j++ {
for i := 0; i < img0.Bounds().Size().X; i++ {
got := img0.At(i, j)
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want := color.RGBA{0x80, 0x80, 0x80, 0x80}
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if got != want {
t.Errorf("img0 At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
func TestImageDispose(t *testing.T) {
img, err := NewImage(16, 16, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
img.Fill(color.White)
if err := img.Dispose(); err != nil {
t.Errorf("img.Dipose() returns error: %v", err)
}
// The color is transparent (color.RGBA{}).
// Note that the value's type must be color.RGBA.
got := img.At(0, 0)
want := color.RGBA{}
if got != want {
t.Errorf("img.At(0, 0) got: %v, want: %v", got, want)
}
}
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func min(a, b int) int {
if a < b {
return a
}
return b
}
func TestImageCompositeModeLighter(t *testing.T) {
img0, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Size()
img1, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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if err := img1.Fill(color.RGBA{0x01, 0x02, 0x03, 0x04}); err != nil {
t.Fatal(err)
return
}
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op := &DrawImageOptions{}
op.CompositeMode = CompositeModeLighter
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if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
return
}
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for j := 0; j < img1.Bounds().Size().Y; j++ {
for i := 0; i < img1.Bounds().Size().X; i++ {
got := img1.At(i, j).(color.RGBA)
want := img0.At(i, j).(color.RGBA)
want.R = uint8(min(0xff, int(want.R)+1))
want.G = uint8(min(0xff, int(want.G)+2))
want.B = uint8(min(0xff, int(want.B)+3))
want.A = uint8(min(0xff, int(want.A)+4))
if got != want {
t.Errorf("img1 At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
func TestNewImageFromEbitenImage(t *testing.T) {
img, _, err := openEbitenImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
if _, err := NewImageFromImage(img, FilterNearest); err != nil {
t.Errorf("NewImageFromImage returns error: %v", err)
}
}
func TestNewImageFromSubImage(t *testing.T) {
img, err := openImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
subImg := img.(*image.NRGBA).SubImage(image.Rect(1, 1, w-1, h-1))
eimg, err := NewImageFromImage(subImg, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
sw, sh := subImg.Bounds().Dx(), subImg.Bounds().Dy()
w2, h2 := eimg.Size()
if w2 != sw {
t.Errorf("eimg Width: got %#v; want %#v", w2, sw)
}
if h2 != sh {
t.Errorf("eimg Width: got %#v; want %#v", h2, sh)
}
for j := 0; j < h2; j++ {
for i := 0; i < w2; i++ {
got := eimg.At(i, j)
want := color.RGBAModel.Convert(img.At(i+1, j+1))
if got != want {
t.Errorf("img0 At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
type mutableRGBA struct {
r, g, b, a uint8
}
func (c *mutableRGBA) RGBA() (r, g, b, a uint32) {
return uint32(c.r) * 0x101, uint32(c.g) * 0x101, uint32(c.b) * 0x101, uint32(c.a) * 0x101
}
func TestImageFill(t *testing.T) {
w, h := 10, 10
img, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
clr := &mutableRGBA{0x80, 0x80, 0x80, 0x80}
if err := img.Fill(clr); err != nil {
t.Fatal(err)
return
}
clr.r = 0
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := img.At(i, j)
want := color.RGBA{0x80, 0x80, 0x80, 0x80}
if got != want {
t.Errorf("img At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
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// Issue #317
func TestImageEdge(t *testing.T) {
const (
img0Width = 16
img0Height = 16
img1Width = 32
img1Height = 32
)
img0, _ := NewImage(img0Width, img0Height, FilterNearest)
pixels := make([]uint8, 4*img0Width*img0Height)
for j := 0; j < img0Height; j++ {
for i := 0; i < img0Width; i++ {
idx := 4 * (i + j*img0Width)
switch {
case j < img0Height/2:
pixels[idx] = 0xff
pixels[idx+1] = 0
pixels[idx+2] = 0
pixels[idx+3] = 0xff
default:
pixels[idx] = 0
pixels[idx+1] = 0xff
pixels[idx+2] = 0
pixels[idx+3] = 0xff
}
}
}
img0.ReplacePixels(pixels)
img1, _ := NewImage(img1Width, img1Height, FilterNearest)
red := color.RGBA{0xff, 0, 0, 0xff}
transparent := color.RGBA{0, 0, 0, 0}
for a := 0; a < 360; a += 5 {
img1.Clear()
op := &DrawImageOptions{}
w, h := img0.Size()
r := image.Rect(0, 0, w, h/2)
op.SourceRect = &r
op.GeoM.Translate(-float64(img0Width)/2, -float64(img0Height)/2)
op.GeoM.Rotate(float64(a) * math.Pi / 180)
op.GeoM.Translate(img1Width/2, img1Height/2)
img1.DrawImage(img0, op)
for j := 0; j < img1Height; j++ {
for i := 0; i < img1Width; i++ {
c := img1.At(i, j)
if c == red {
continue
}
if c == transparent {
continue
}
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t.Errorf("img1.At(%d, %d) (angle: %d) want: red or transparent, got: %v", i, j, a, c)
}
}
}
}
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func indexToColor(index int) uint8 {
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return uint8((17*index + 0x40) % 256)
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}
// Issue #419
func TestImageTooManyFill(t *testing.T) {
const width = 1024
src, _ := NewImage(1, 1, FilterNearest)
dst, _ := NewImage(width, 1, FilterNearest)
for i := 0; i < width; i++ {
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c := indexToColor(i)
src.Fill(color.RGBA{c, c, c, 0xff})
op := &DrawImageOptions{}
op.GeoM.Translate(float64(i), 0)
dst.DrawImage(src, op)
}
for i := 0; i < width; i++ {
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c := indexToColor(i)
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got := color.RGBAModel.Convert(dst.At(i, 0)).(color.RGBA)
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want := color.RGBA{c, c, c, 0xff}
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if !sameColors(got, want, 1) {
t.Errorf("dst.At(%d, %d): got %#v, want: %#v", i, 0, got, want)
}
}
}
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func BenchmarkDrawImage(b *testing.B) {
img0, _ := NewImage(16, 16, FilterNearest)
img1, _ := NewImage(16, 16, FilterNearest)
op := &DrawImageOptions{}
for i := 0; i < b.N; i++ {
img0.DrawImage(img1, op)
}
}
func TestImageLinear(t *testing.T) {
src, _ := NewImage(32, 32, FilterLinear)
dst, _ := NewImage(64, 64, FilterNearest)
src.Fill(color.RGBA{0, 0xff, 0, 0xff})
ebitenutil.DrawRect(src, 8, 8, 16, 16, color.RGBA{0xff, 0, 0, 0xff})
op := &DrawImageOptions{}
op.GeoM.Translate(8, 8)
op.GeoM.Scale(2, 2)
r := image.Rect(8, 8, 24, 24)
op.SourceRect = &r
dst.DrawImage(src, op)
for j := 0; j < 64; j++ {
for i := 0; i < 64; i++ {
c := color.RGBAModel.Convert(dst.At(i, j)).(color.RGBA)
got := c.G
want := uint8(0)
if abs(int(c.G)-int(want)) > 1 {
t.Errorf("dst At(%d, %d).G: got %#v, want: %#v", i, j, got, want)
}
}
}
}
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func TestImageOutside(t *testing.T) {
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src, _ := NewImage(5, 10, FilterNearest) // internal texture size is 8x16.
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dst, _ := NewImage(4, 4, FilterNearest)
src.Fill(color.RGBA{0xff, 0, 0, 0xff})
cases := []struct {
X, Y, Width, Height int
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}{
{-4, -4, 4, 4},
{5, 0, 4, 4},
{0, 10, 4, 4},
{5, 10, 4, 4},
{8, 0, 4, 4},
{0, 16, 4, 4},
{8, 16, 4, 4},
{8, -4, 4, 4},
{-4, 16, 4, 4},
{5, 10, 0, 0},
{5, 10, -2, -2}, // non-well-formed rectangle
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}
for _, c := range cases {
dst.Clear()
op := &DrawImageOptions{}
op.GeoM.Translate(0, 0)
op.SourceRect = &image.Rectangle{
Min: image.Pt(c.X, c.Y),
Max: image.Pt(c.X+c.Width, c.Y+c.Height),
}
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dst.DrawImage(src, op)
for j := 0; j < 4; j++ {
for i := 0; i < 4; i++ {
got := color.RGBAModel.Convert(dst.At(i, j)).(color.RGBA)
want := color.RGBA{0, 0, 0, 0}
if got != want {
t.Errorf("src(x: %d, y: %d, w: %d, h: %d), dst At(%d, %d): got %#v, want: %#v", c.X, c.Y, c.Width, c.Height, i, j, got, want)
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}
}
}
}
}
func TestImageOutsideUpperLeft(t *testing.T) {
src, _ := NewImage(4, 4, FilterNearest)
dst1, _ := NewImage(16, 16, FilterNearest)
dst2, _ := NewImage(16, 16, FilterNearest)
src.Fill(color.RGBA{0xff, 0, 0, 0xff})
op := &DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 4)
r := image.Rect(-4, -4, 8, 8)
op.SourceRect = &r
dst1.DrawImage(src, op)
op = &DrawImageOptions{}
op.GeoM.Translate(4, 4)
op.GeoM.Rotate(math.Pi / 4)
dst2.DrawImage(src, op)
for j := 0; j < 16; j++ {
for i := 0; i < 16; i++ {
got := color.RGBAModel.Convert(dst1.At(i, j)).(color.RGBA)
want := color.RGBAModel.Convert(dst2.At(i, j)).(color.RGBA)
if got != want {
t.Errorf("got: dst1.At(%d, %d): %#v, want: dst2.At(%d, %d): %#v", i, j, got, i, j, want)
}
}
}
}
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func TestImageSize(t *testing.T) {
const (
w = 17
h = 31
)
img, _ := NewImage(w, h, FilterDefault)
gotW, gotH := img.Size()
if gotW != w {
t.Errorf("got: %d, want: %d", gotW, w)
}
if gotH != h {
t.Errorf("got: %d, want: %d", gotH, h)
}
}
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func TestImageSize1(t *testing.T) {
src, _ := NewImage(1, 1, FilterNearest)
dst, _ := NewImage(1, 1, FilterNearest)
src.Fill(color.White)
dst.DrawImage(src, nil)
got := color.RGBAModel.Convert(src.At(0, 0)).(color.RGBA)
want := color.RGBAModel.Convert(color.White).(color.RGBA)
if !sameColors(got, want, 1) {
t.Errorf("got: %#v, want: %#v", got, want)
}
}
func TestImageSize4096(t *testing.T) {
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src, _ := NewImage(4096, 4096, FilterNearest)
dst, _ := NewImage(4096, 4096, FilterNearest)
pix := make([]byte, 4096*4096*4)
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for i := 0; i < 4096; i++ {
j := 4095
idx := 4 * (i + j*4096)
pix[idx] = uint8(i + j)
pix[idx+1] = uint8((i + j) >> 8)
pix[idx+2] = uint8((i + j) >> 16)
pix[idx+3] = 0xff
}
for j := 0; j < 4096; j++ {
i := 4095
idx := 4 * (i + j*4096)
pix[idx] = uint8(i + j)
pix[idx+1] = uint8((i + j) >> 8)
pix[idx+2] = uint8((i + j) >> 16)
pix[idx+3] = 0xff
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}
src.ReplacePixels(pix)
dst.DrawImage(src, nil)
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for i := 4095; i < 4096; i++ {
j := 4095
got := color.RGBAModel.Convert(dst.At(i, j)).(color.RGBA)
want := color.RGBA{uint8(i + j), uint8((i + j) >> 8), uint8((i + j) >> 16), 0xff}
if got != want {
t.Errorf("At(%d, %d): got: %#v, want: %#v", i, j, got, want)
}
}
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for j := 4095; j < 4096; j++ {
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i := 4095
got := color.RGBAModel.Convert(dst.At(i, j)).(color.RGBA)
want := color.RGBA{uint8(i + j), uint8((i + j) >> 8), uint8((i + j) >> 16), 0xff}
if got != want {
t.Errorf("At(%d, %d): got: %#v, want: %#v", i, j, got, want)
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}
}
}
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func TestImageCopy(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Errorf("copying image and using it should panic")
}
}()
img0, _ := NewImage(256, 256, FilterDefault)
img1 := *img0
img1.Fill(color.Transparent)
}