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graphicsdriver/metal: Implement CompositeModeMultiply

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Updates #410
This commit is contained in:
Hajime Hoshi 2020-07-18 21:51:52 +09:00
parent 3010476e9d
commit 6ccb614b08
2 changed files with 30 additions and 0 deletions
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28
image_test.go
View File

@ -2199,3 +2199,31 @@ func TestImageReplacePixelsAndModifyPixels(t *testing.T) {
}
}
}
func TestImageCompositeModeMultiply(t *testing.T) {
const w, h = 16, 16
dst, _ := NewImage(w, h, FilterDefault)
src, _ := NewImage(w, h, FilterDefault)
dst.Fill(color.RGBA{0x01, 0x02, 0x03, 0x04})
src.Fill(color.RGBA{0x05, 0x06, 0x07, 0x08})
op := &DrawImageOptions{}
op.CompositeMode = CompositeModeMultiply
dst.DrawImage(src, op)
for j := 0; j < h; j++ {
for i := 0; i < w; i++ {
got := dst.At(i, j).(color.RGBA)
want := color.RGBA{
R: byte(math.Floor((0x01 / 255.0) * (0x05 / 255.0) * 255)),
G: byte(math.Floor((0x02 / 255.0) * (0x06 / 255.0) * 255)),
B: byte(math.Floor((0x03 / 255.0) * (0x07 / 255.0) * 255)),
A: byte(math.Floor((0x04 / 255.0) * (0x08 / 255.0) * 255)),
}
if got != want {
t.Errorf("dst.At(%d, %d): got: %v, want: %v", i, j, got, want)
}
}
}
}

2
internal/graphicsdriver/metal/graphics.go
View File

@ -571,6 +571,8 @@ func (g *Graphics) Reset() error {
return mtl.BlendFactorOneMinusSourceAlpha
case driver.OneMinusDstAlpha:
return mtl.BlendFactorOneMinusDestinationAlpha
case driver.DstColor:
return mtl.BlendFactorDestinationColor
default:
panic(fmt.Sprintf("metal: invalid operation: %d", c))
}