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graphics: Add TestImageLinearGradation

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This commit is contained in:
Hajime Hoshi 2018-12-03 01:53:12 +01:00
parent f85a62c6a7
commit 968e137cc5
1 changed files with 28 additions and 1 deletions
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29
image_test.go
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@ -681,7 +681,34 @@ func BenchmarkDrawImage(b *testing.B) {
}
}
func TestImageLinear(t *testing.T) {
func TestImageLinearGradiation(t *testing.T) {
img0, _ := NewImage(2, 2, FilterNearest)
img0.ReplacePixels([]byte{
0xff, 0x00, 0x00, 0xff,
0x00, 0xff, 0x00, 0xff,
0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
})
const w, h = 32, 32
img1, _ := NewImage(w, h, FilterNearest)
op := &DrawImageOptions{}
op.GeoM.Scale(w, h)
op.GeoM.Translate(-w/4, -h/4)
op.Filter = 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 TestImageLinearEdges(t *testing.T) {
src, _ := NewImage(32, 32, FilterDefault)
dst, _ := NewImage(64, 64, FilterDefault)
src.Fill(color.RGBA{0, 0xff, 0, 0xff})