ebiten/image_test.go
2014-12-24 23:17:58 +09:00

132 lines
2.9 KiB
Go

// Copyright 2014 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 (
. "."
"image"
"image/color"
_ "image/png"
"os"
"testing"
)
func openImage(path string) (*Image, image.Image, error) {
file, err := os.Open(path)
if err != nil {
return nil, nil, err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return nil, nil, err
}
eimg, err := NewImageFromImage(img, FilterNearest)
if err != nil {
return nil, nil, err
}
return eimg, img, nil
}
func diff(x, y uint8) uint8 {
if x <= y {
return y - x
}
return x - y
}
func TestPixels(t *testing.T) {
eimg, img, err := openImage("testdata/ebiten.png")
if err != nil {
t.Fatal(err)
return
}
if got := eimg.Bounds().Size(); got != img.Bounds().Size() {
t.Errorf("img size: got %d; want %d", got, img.Bounds().Size())
}
for j := 0; j < eimg.Bounds().Size().Y; j++ {
for i := 0; i < eimg.Bounds().Size().X; i++ {
got := eimg.At(i, j)
want := color.RGBAModel.Convert(img.At(i, j))
if got != want {
t.Errorf("img At(%d, %d): got %#v; want %#v", i, j, got, want)
}
}
}
}
func TestComposition(t *testing.T) {
img2Color := color.NRGBA{0x24, 0x3f, 0x6a, 0x88}
img3Color := color.NRGBA{0x85, 0xa3, 0x08, 0xd3}
img1, _, err := openImage("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
}
img2.Fill(img2Color)
img3.Fill(img3Color)
img_12_3, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
img2.DrawImage(img1, nil)
img3.DrawImage(img2, nil)
img_12_3.DrawImage(img3, nil)
img2.Fill(img2Color)
img3.Fill(img3Color)
img_1_23, err := NewImage(w, h, FilterNearest)
if err != nil {
t.Fatal(err)
return
}
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 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)
}
}
}
}
// TODO: Add more tests (e.g. DrawImage with color matrix)