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ebiten: add TestImageColorMScale

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This commit is contained in:
Hajime Hoshi 2022-10-31 14:35:26 +09:00
parent b966190b34
commit 3eff8bcfa3
1 changed files with 25 additions and 0 deletions
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25
image_test.go
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@ -3941,3 +3941,28 @@ func TestImageAntiAliasAndBlend(t *testing.T) {
}
}
}
func TestImageColorMScale(t *testing.T) {
const w, h = 16, 16
dst0 := ebiten.NewImage(w, h)
dst1 := ebiten.NewImage(w, h)
src := ebiten.NewImage(w, h)
src.Fill(color.RGBA{0x24, 0x3f, 0x6a, 0x88})
// As the ColorM is a diagonal matrix, a built-in shader for a color matrix is NOT used.
op := &ebiten.DrawImageOptions{}
op.ColorM.Scale(0.3, 0.4, 0.5, 0.6)
dst0.DrawImage(src, op)
// As the ColorM is not a diagonal matrix, a built-in shader for a color matrix is used.
op = &ebiten.DrawImageOptions{}
op.ColorM.Scale(0.3, 0.4, 0.5, 0.6)
op.ColorM.Translate(0, 0, 0, 1e-4)
dst1.DrawImage(src, op)
got := dst0.At(0, 0)
want := dst1.At(0, 0)
if got != want {
t.Errorf("got: %v, want: %v", got, want)
}
}