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image_test.go
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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 (
"bytes"
"fmt"
"image"
"image/color"
"image/draw"
_ "image/png"
"math"
"math/rand"
"runtime"
"testing"
"time"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
"github.com/hajimehoshi/ebiten/v2/internal/graphics"
t "github.com/hajimehoshi/ebiten/v2/internal/testing"
"github.com/hajimehoshi/ebiten/v2/internal/ui"
)
// maxImageSize is a maximum image size that should work in almost every environment.
const maxImageSize = 4096 - 2
func init() {
rand.Seed(time.Now().UnixNano())
}
func skipTooSlowTests(t *testing.T) bool {
if testing.Short() {
t.Skip("skipping test in short mode")
return true
}
if runtime.GOOS == "js" {
t.Skip("too slow or fragile on Wasm")
return true
}
return false
}
func TestMain(m *testing.M) {
ui.SetPanicOnErrorOnReadingPixelsForTesting(true)
t.MainWithRunLoop(m)
}
func openEbitenImage() (*ebiten.Image, image.Image, error) {
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
if err != nil {
return nil, nil, err
}
eimg := ebiten.NewImageFromImage(img)
return eimg, img, nil
}
func abs(x int) int {
if x < 0 {
return -x
}
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
}
func TestImagePixels(t *testing.T) {
img0, img, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
if got := img0.Bounds().Size(); got != img.Bounds().Size() {
t.Fatalf("img size: got %d; want %d", got, img.Bounds().Size())
}
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
// Check out of range part
w2, h2 := graphics.InternalImageSize(w), graphics.InternalImageSize(h)
for j := -100; j < h2+100; j++ {
for i := -100; i < w2+100; i++ {
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)
}
}
}
pix := make([]byte, 4*w*h)
img0.ReadPixels(pix)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
idx := 4 * (j*w + i)
got := color.RGBA{R: pix[idx], G: pix[idx+1], B: pix[idx+2], A: pix[idx+3]}
want := color.RGBAModel.Convert(img.At(i, j))
if got != want {
t.Errorf("(%d, %d): got %v; want %v", i, j, got, want)
}
}
}
}
func TestImageComposition(t *testing.T) {
img2Color := color.NRGBA{R: 0x24, G: 0x3f, B: 0x6a, A: 0x88}
img3Color := color.NRGBA{R: 0x85, G: 0xa3, B: 0x08, A: 0xd3}
// TODO: Rename this to img0
img1, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := img1.Bounds().Dx(), img1.Bounds().Dy()
img2 := ebiten.NewImage(w, h)
img3 := ebiten.NewImage(w, h)
img2.Fill(img2Color)
img3.Fill(img3Color)
img_12_3 := ebiten.NewImage(w, h)
img2.DrawImage(img1, nil)
img3.DrawImage(img2, nil)
img_12_3.DrawImage(img3, nil)
img2.Fill(img2Color)
img3.Fill(img3Color)
img_1_23 := ebiten.NewImage(w, h)
img3.DrawImage(img2, nil)
img3.DrawImage(img1, nil)
img_1_23.DrawImage(img3, nil)
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) {
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) {
// Note that mutex usages: without defer, unlocking is not called when panicking.
defer func() {
if r := recover(); r == nil {
t.Errorf("DrawImage must panic but not")
}
}()
img, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
img.DrawImage(img, nil)
}
func TestImageScale(t *testing.T) {
for _, scale := range []int{2, 3, 4} {
img0, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
img1 := ebiten.NewImage(w*scale, h*scale)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(float64(scale), float64(scale))
img1.DrawImage(img0, op)
for j := 0; j < h*scale; j++ {
for i := 0; i < w*scale; i++ {
c0 := img0.At(i/scale, j/scale).(color.RGBA)
c1 := img1.At(i, j).(color.RGBA)
if c0 != c1 {
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)
}
}
}
}
}
func TestImage90DegreeRotate(t *testing.T) {
img0, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
img1 := ebiten.NewImage(h, w)
op := &ebiten.DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 2)
op.GeoM.Translate(float64(h), 0)
img1.DrawImage(img0, op)
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)
}
}
}
}
func TestImageDotByDotInversion(t *testing.T) {
img0, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
img1 := ebiten.NewImage(w, h)
op := &ebiten.DrawImageOptions{}
op.GeoM.Rotate(math.Pi)
op.GeoM.Translate(float64(w), float64(h))
img1.DrawImage(img0, op)
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 TestImageWritePixels(t *testing.T) {
// Create a dummy image so that the shared texture is used and origImg's position is shifted.
dummyImg := ebiten.NewImageFromImage(image.NewRGBA(image.Rect(0, 0, 16, 16)))
defer dummyImg.Dispose()
_, origImg, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
// Convert to *image.RGBA just in case.
img := image.NewRGBA(origImg.Bounds())
draw.Draw(img, img.Bounds(), origImg, image.ZP, draw.Src)
size := img.Bounds().Size()
img0 := ebiten.NewImage(size.X, size.Y)
img0.WritePixels(img.Pix)
for j := 0; j < img0.Bounds().Dy(); j++ {
for i := 0; i < img0.Bounds().Dx(); 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)
for i := range p {
p[i] = 0x80
}
img0.WritePixels(p)
// Even if p is changed after calling ReplacePixel, img0 uses the original values.
for i := range p {
p[i] = 0
}
for j := 0; j < img0.Bounds().Dy(); j++ {
for i := 0; i < img0.Bounds().Dx(); i++ {
got := img0.At(i, j)
want := color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80}
if got != want {
t.Errorf("img0 At(%d, %d): got %v; want %v", i, j, got, want)
}
}
}
}
func TestImageWritePixelsNil(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Errorf("WritePixels(nil) must panic")
}
}()
img := ebiten.NewImage(16, 16)
img.Fill(color.White)
img.WritePixels(nil)
}
func TestImageDispose(t *testing.T) {
img := ebiten.NewImage(16, 16)
img.Fill(color.White)
img.Dispose()
// 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)
}
}
func min(a, b int) int {
if a < b {
return a
}
return b
}
func TestImageBlendLighter(t *testing.T) {
img0, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
img1 := ebiten.NewImage(w, h)
img1.Fill(color.RGBA{R: 0x01, G: 0x02, B: 0x03, A: 0x04})
op := &ebiten.DrawImageOptions{}
op.Blend = ebiten.BlendLighter
img1.DrawImage(img0, op)
for j := 0; j < img1.Bounds().Dy(); j++ {
for i := 0; i < img1.Bounds().Dx(); 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()
if err != nil {
t.Fatal(err)
return
}
_ = ebiten.NewImageFromImage(img)
}
func TestNewImageFromSubImage(t *testing.T) {
_, img, err := openEbitenImage()
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 := ebiten.NewImageFromImage(subImg)
sw, sh := subImg.Bounds().Dx(), subImg.Bounds().Dy()
w2, h2 := eimg.Bounds().Dx(), eimg.Bounds().Dy()
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 := ebiten.NewImage(w, h)
clr := &mutableRGBA{0x80, 0x80, 0x80, 0x80}
img.Fill(clr)
clr.r = 0
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := img.At(i, j)
want := color.RGBA{R: 0x80, G: 0x80, B: 0x80, A: 0x80}
if got != want {
t.Errorf("img At(%d, %d): got %v; want %v", i, j, got, want)
}
}
}
}
// Issue #740
func TestImageClear(t *testing.T) {
const w, h = 128, 256
img := ebiten.NewImage(w, h)
img.Fill(color.White)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := img.At(i, j)
want := color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
if got != want {
t.Errorf("img At(%d, %d): got %v; want %v", i, j, got, want)
}
}
}
img.Clear()
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := img.At(i, j)
want := color.RGBA{}
if got != want {
t.Errorf("img At(%d, %d): got %v; want %v", i, j, got, want)
}
}
}
}
// Issue #317, #558, #724
func TestImageEdge(t *testing.T) {
// TODO: This test is not so meaningful after #1218. Do we remove this?
if skipTooSlowTests(t) {
return
}
const (
img0Width = 10
img0Height = 10
img0InnerWidth = 10
img0InnerHeight = 10
img1Width = 32
img1Height = 32
)
img0 := ebiten.NewImage(img0Width, img0Height)
pixels := make([]uint8, 4*img0Width*img0Height)
for j := 0; j < img0Height; j++ {
for i := 0; i < img0Width; i++ {
idx := 4 * (i + j*img0Width)
pixels[idx] = 0xff
pixels[idx+1] = 0
pixels[idx+2] = 0
pixels[idx+3] = 0xff
}
}
img0.WritePixels(pixels)
img1 := ebiten.NewImage(img1Width, img1Height)
red := color.RGBA{R: 0xff, A: 0xff}
transparent := color.RGBA{}
angles := []float64{}
for a := 0; a < 1440; a++ {
angles = append(angles, float64(a)/1440*2*math.Pi)
}
for a := 0; a < 4096; a += 3 {
// a++ should be fine, but it takes long to test.
angles = append(angles, float64(a)/4096*2*math.Pi)
}
for _, s := range []float64{1, 0.5, 0.25} {
for _, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} {
for _, a := range angles {
for _, testDrawTriangles := range []bool{false, true} {
img1.Clear()
w, h := img0.Bounds().Dx(), img0.Bounds().Dy()
b := img0.Bounds()
var geo ebiten.GeoM
geo.Translate(-float64(w)/2, -float64(h)/2)
geo.Scale(s, s)
geo.Rotate(a)
geo.Translate(img1Width/2, img1Height/2)
if !testDrawTriangles {
op := &ebiten.DrawImageOptions{}
op.GeoM = geo
op.Filter = f
img1.DrawImage(img0, op)
} else {
op := &ebiten.DrawTrianglesOptions{}
dx0, dy0 := geo.Apply(0, 0)
dx1, dy1 := geo.Apply(float64(w), 0)
dx2, dy2 := geo.Apply(0, float64(h))
dx3, dy3 := geo.Apply(float64(w), float64(h))
vs := []ebiten.Vertex{
{
DstX: float32(dx0),
DstY: float32(dy0),
SrcX: float32(b.Min.X),
SrcY: float32(b.Min.Y),
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: float32(dx1),
DstY: float32(dy1),
SrcX: float32(b.Max.X),
SrcY: float32(b.Min.Y),
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: float32(dx2),
DstY: float32(dy2),
SrcX: float32(b.Min.X),
SrcY: float32(b.Max.Y),
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
{
DstX: float32(dx3),
DstY: float32(dy3),
SrcX: float32(b.Max.X),
SrcY: float32(b.Max.Y),
ColorR: 1,
ColorG: 1,
ColorB: 1,
ColorA: 1,
},
}
is := graphics.QuadIndices()
op.Filter = f
img1.DrawTriangles(vs, is, img0, op)
}
allTransparent := true
for j := 0; j < img1Height; j++ {
for i := 0; i < img1Width; i++ {
c := img1.At(i, j)
if c == transparent {
continue
}
allTransparent = false
switch f {
case ebiten.FilterNearest:
if c == red {
continue
}
case ebiten.FilterLinear:
if _, g, b, _ := c.RGBA(); g == 0 && b == 0 {
continue
}
}
t.Fatalf("img1.At(%d, %d) (filter: %d, scale: %f, angle: %f, draw-triangles?: %t) want: red or transparent, got: %v", i, j, f, s, a, testDrawTriangles, c)
}
}
if allTransparent {
t.Fatalf("img1 (filter: %d, scale: %f, angle: %f, draw-triangles?: %t) is transparent but should not", f, s, a, testDrawTriangles)
}
}
}
}
}
}
// Issue #419
func TestImageTooManyFill(t *testing.T) {
const width = 1024
indexToColor := func(index int) uint8 {
return uint8((17*index + 0x40) % 256)
}
src := ebiten.NewImage(1, 1)
dst := ebiten.NewImage(width, 1)
for i := 0; i < width; i++ {
c := indexToColor(i)
src.Fill(color.RGBA{R: c, G: c, B: c, A: 0xff})
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(i), 0)
dst.DrawImage(src, op)
}
for i := 0; i < width; i++ {
c := indexToColor(i)
got := dst.At(i, 0).(color.RGBA)
want := color.RGBA{R: c, G: c, B: c, A: 0xff}
if !sameColors(got, want, 1) {
t.Errorf("dst.At(%d, %d): got %v, want: %v", i, 0, got, want)
}
}
}
func BenchmarkDrawImage(b *testing.B) {
img0 := ebiten.NewImage(16, 16)
img1 := ebiten.NewImage(16, 16)
op := &ebiten.DrawImageOptions{}
for i := 0; i < b.N; i++ {
img0.DrawImage(img1, op)
}
}
func TestImageLinearGraduation(t *testing.T) {
img0 := ebiten.NewImage(2, 2)
img0.WritePixels([]byte{
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
})
const w, h = 32, 32
img1 := ebiten.NewImage(w, h)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(w, h)
op.GeoM.Translate(-w/4, -h/4)
op.Filter = ebiten.FilterLinear
img1.DrawImage(img0, op)
for j := 1; j < h-1; j++ {
for i := 1; i < w-1; i++ {
c := img1.At(i, j).(color.RGBA)
if c.R == 0 || c.R == 0xff {
t.Errorf("img1.At(%d, %d).R must be in between 0x01 and 0xfe but %v", i, j, c)
}
}
}
}
func TestImageOutside(t *testing.T) {
src := ebiten.NewImage(5, 10) // internal texture size is 8x16.
dst := ebiten.NewImage(4, 4)
src.Fill(color.RGBA{R: 0xff, A: 0xff})
cases := []struct {
X, Y, Width, Height int
}{
{-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
}
for _, c := range cases {
dst.Clear()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(0, 0)
dst.DrawImage(src.SubImage(image.Rectangle{
Min: image.Pt(c.X, c.Y),
Max: image.Pt(c.X+c.Width, c.Y+c.Height),
}).(*ebiten.Image), op)
for j := 0; j < 4; j++ {
for i := 0; i < 4; i++ {
got := dst.At(i, j).(color.RGBA)
want := color.RGBA{}
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)
}
}
}
}
}
func TestImageOutsideUpperLeft(t *testing.T) {
src := ebiten.NewImage(4, 4)
dst1 := ebiten.NewImage(16, 16)
dst2 := ebiten.NewImage(16, 16)
src.Fill(color.RGBA{R: 0xff, A: 0xff})
op := &ebiten.DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 4)
dst1.DrawImage(src.SubImage(image.Rect(-4, -4, 8, 8)).(*ebiten.Image), op)
op = &ebiten.DrawImageOptions{}
op.GeoM.Rotate(math.Pi / 4)
dst2.DrawImage(src, op)
for j := 0; j < 16; j++ {
for i := 0; i < 16; i++ {
got := dst1.At(i, j).(color.RGBA)
want := 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)
}
}
}
}
func TestImageSize(t *testing.T) {
const (
w = 17
h = 31
)
img := ebiten.NewImage(w, h)
gotW, gotH := img.Bounds().Dx(), img.Bounds().Dy()
if gotW != w {
t.Errorf("got: %d, want: %d", gotW, w)
}
if gotH != h {
t.Errorf("got: %d, want: %d", gotH, h)
}
}
func TestImageSize1(t *testing.T) {
src := ebiten.NewImage(1, 1)
dst := ebiten.NewImage(1, 1)
src.Fill(color.White)
dst.DrawImage(src, nil)
got := src.At(0, 0).(color.RGBA)
want := color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
if !sameColors(got, want, 1) {
t.Errorf("got: %v, want: %v", got, want)
}
}
// TODO: Enable this test again. This test fails after #1217 is fixed.
func Skip_TestImageSize4096(t *testing.T) {
src := ebiten.NewImage(4096, 4096)
dst := ebiten.NewImage(4096, 4096)
pix := make([]byte, 4096*4096*4)
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
}
src.WritePixels(pix)
dst.DrawImage(src, nil)
for i := 4095; i < 4096; i++ {
j := 4095
got := dst.At(i, j).(color.RGBA)
want := color.RGBA{R: uint8(i + j), G: uint8((i + j) >> 8), B: uint8((i + j) >> 16), A: 0xff}
if got != want {
t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
for j := 4095; j < 4096; j++ {
i := 4095
got := dst.At(i, j).(color.RGBA)
want := color.RGBA{R: uint8(i + j), G: uint8((i + j) >> 8), B: uint8((i + j) >> 16), A: 0xff}
if got != want {
t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
func TestImageCopy(t *testing.T) {
defer func() {
if r := recover(); r == nil {
t.Errorf("copying image and using it must panic")
}
}()
img0 := ebiten.NewImage(256, 256)
img1 := *img0
img1.Fill(color.Transparent)
}
// Issue #611, #907
func TestImageStretch(t *testing.T) {
if skipTooSlowTests(t) {
return
}
const w = 16
dst := ebiten.NewImage(w, maxImageSize)
loop:
for h := 1; h <= 32; h++ {
src := ebiten.NewImage(w+2, h+2)
pix := make([]byte, 4*(w+2)*(h+2))
for i := 0; i < (w+2)*(h+2); i++ {
pix[4*i] = 0xff
pix[4*i+3] = 0xff
}
src.WritePixels(pix)
dh := dst.Bounds().Dy()
for i := 0; i < dh; {
dst.Clear()
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(1, float64(i)/float64(h))
dst.DrawImage(src.SubImage(image.Rect(1, 1, w+1, h+1)).(*ebiten.Image), op)
for j := -1; j <= 1; j++ {
if i+j < 0 {
continue
}
got := dst.At(0, i+j).(color.RGBA)
want := color.RGBA{}
if j < 0 {
want = color.RGBA{R: 0xff, A: 0xff}
}
if got != want {
t.Errorf("At(%d, %d) (height=%d, scale=%d/%d): got: %v, want: %v", 0, i+j, h, i, h, got, want)
continue loop
}
}
switch i % 32 {
case 31, 0:
i++
case 1:
i += 32 - 2
default:
panic("not reached")
}
}
}
}
func TestImageSprites(t *testing.T) {
const (
width = 512
height = 512
)
src := ebiten.NewImage(4, 4)
src.Fill(color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff})
dst := ebiten.NewImage(width, height)
for j := 0; j < height/4; j++ {
for i := 0; i < width/4; i++ {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(i*4), float64(j*4))
dst.DrawImage(src, op)
}
}
for j := 0; j < height/4; j++ {
for i := 0; i < width/4; i++ {
got := dst.At(i*4, j*4).(color.RGBA)
want := color.RGBA{R: 0xff, G: 0xff, B: 0xff, A: 0xff}
if !sameColors(got, want, 1) {
t.Errorf("dst.At(%d, %d): got %v, want: %v", i*4, j*4, got, want)
}
}
}
}
// Disabled: it does not make sense to expect deterministic mipmap results (#909).
func Disabled_TestImageMipmap(t *testing.T) {
src, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := src.Bounds().Dx(), src.Bounds().Dy()
l1 := ebiten.NewImage(w/2, h/2)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = ebiten.FilterLinear
l1.DrawImage(src, op)
l1w, l1h := l1.Bounds().Dx(), l1.Bounds().Dy()
l2 := ebiten.NewImage(l1w/2, l1h/2)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = ebiten.FilterLinear
l2.DrawImage(l1, op)
gotDst := ebiten.NewImage(w, h)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(1/5.0, 1/5.0)
op.Filter = ebiten.FilterLinear
gotDst.DrawImage(src, op)
wantDst := ebiten.NewImage(w, h)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(4.0/5.0, 4.0/5.0)
op.Filter = ebiten.FilterLinear
wantDst.DrawImage(l2, op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := gotDst.At(i, j).(color.RGBA)
want := wantDst.At(i, j).(color.RGBA)
if !sameColors(got, want, 1) {
t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
}
// Disabled: it does not make sense to expect deterministic mipmap results (#909).
func Disabled_TestImageMipmapNegativeDet(t *testing.T) {
src, _, err := openEbitenImage()
if err != nil {
t.Fatal(err)
return
}
w, h := src.Bounds().Dx(), src.Bounds().Dy()
l1 := ebiten.NewImage(w/2, h/2)
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = ebiten.FilterLinear
l1.DrawImage(src, op)
l1w, l1h := l1.Bounds().Dx(), l1.Bounds().Dy()
l2 := ebiten.NewImage(l1w/2, l1h/2)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(1/2.0, 1/2.0)
op.Filter = ebiten.FilterLinear
l2.DrawImage(l1, op)
gotDst := ebiten.NewImage(w, h)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(-1/5.0, -1/5.0)
op.GeoM.Translate(float64(w), float64(h))
op.Filter = ebiten.FilterLinear
gotDst.DrawImage(src, op)
wantDst := ebiten.NewImage(w, h)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(-4.0/5.0, -4.0/5.0)
op.GeoM.Translate(float64(w), float64(h))
op.Filter = ebiten.FilterLinear
wantDst.DrawImage(l2, op)
allZero := true
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := gotDst.At(i, j).(color.RGBA)
want := wantDst.At(i, j).(color.RGBA)
if !sameColors(got, want, 1) {
t.Errorf("At(%d, %d): got: %v, want: %v", i, j, got, want)
}
if got.A > 0 {
allZero = false
}
}
}
if allZero {
t.Errorf("the image must include non-zero values but not")
}
}
// Issue #710
func TestImageMipmapColor(t *testing.T) {
img0 := ebiten.NewImage(256, 256)
img1 := ebiten.NewImage(128, 128)
img1.Fill(color.White)
for i := 0; i < 8; i++ {
img0.Clear()