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"
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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
}
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func diff(x, y uint8) uint8 {
if x <= y {
return y - x
}
return x - y
}
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 1 < diff(c1.R, c2.R) || 1 < diff(c1.G, c2.G) || 1 < diff(c1.B, c2.B) || 1 < diff(c1.A, c2.A) {
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) {
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)
}
}
}
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}
func TestImageDispose(t *testing.T) {
img, err := NewImage(16, 16, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
if err := img.Dispose(); err != nil {
t.Errorf("img.Dipose() returns error: %v", err)
}
}
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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, err := NewImage(img0Width, img0Height, FilterNearest)
if err != nil {
t.Fatal(err)
}
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
}
}
}
if err := img0.ReplacePixels(pixels); err != nil {
t.Fatal(err)
}
img1, err := NewImage(img1Width, img1Height, FilterNearest)
if err != nil {
t.Fatal(err)
}
red := color.RGBA{0xff, 0, 0, 0xff}
transparent := color.RGBA{0, 0, 0, 0}
for a := 0; a < 360; a += 5 {
if err := img1.Clear(); err != nil {
t.Fatal(err)
}
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)
if err := img1.DrawImage(img0, op); err != nil {
t.Fatal(err)
}
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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// 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++ {
src.Fill(color.RGBA{uint8(i), uint8(i), uint8(i), 0xff})
op := &DrawImageOptions{}
op.GeoM.Translate(float64(i), 0)
dst.DrawImage(src, op)
}
for i := 0; i < width; i++ {
got := color.RGBAModel.Convert(dst.At(i, 0))
want := color.RGBA{uint8(i), uint8(i), uint8(i), 0xff}
if got != want {
t.Errorf("src 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)
}
}