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ebiten: add TestImageColorMAndScale

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This commit is contained in:
Hajime Hoshi 2022-10-02 00:48:05 +09:00
parent fb6dffaf12
commit f6c4b29a3d
1 changed files with 66 additions and 0 deletions
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66
image_test.go
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@ -3433,3 +3433,69 @@ func TestImageTooManyConstantBuffersInDirectX(t *testing.T) {
t.Errorf("got: %v, want: %v", got, want)
}
}
func TestImageColorMAndScale(t *testing.T) {
const w, h = 16, 16
dst := ebiten.NewImage(w, h)
src := ebiten.NewImage(w, h)
src.Fill(color.RGBA{0x80, 0x80, 0x80, 0x80})
vs := []ebiten.Vertex{
{
SrcX: 0,
SrcY: 0,
DstX: 0,
DstY: 0,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: w,
SrcY: 0,
DstX: w,
DstY: 0,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: 0,
SrcY: h,
DstX: 0,
DstY: h,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
{
SrcX: w,
SrcY: h,
DstX: w,
DstY: h,
ColorR: 0.5,
ColorG: 0.25,
ColorB: 0.5,
ColorA: 0.75,
},
}
is := []uint16{0, 1, 2, 1, 2, 3}
op := &ebiten.DrawTrianglesOptions{}
op.ColorM.Translate(0.25, 0.25, 0.25, 0)
dst.DrawTriangles(vs, is, src, op)
got := dst.At(0, 0).(color.RGBA)
alphaBeforeScale := 0.5
want := color.RGBA{
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.25 * 0.75)),
byte(math.Floor(0xff * (0.5/alphaBeforeScale + 0.25) * alphaBeforeScale * 0.5 * 0.75)),
byte(math.Floor(0xff * alphaBeforeScale * 0.75)),
}
if !sameColors(got, want, 2) {
t.Errorf("got: %v, want: %v", got, want)
}
}