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op/paint: add opacity operation

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The new paint.PushOpacity allows for adjusting the opacity of a group
of drawing operations.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2023-09-07 14:44:56 -05:00
parent ae43d18ced
commit ae3bd2a1e1
8 changed files with 270 additions and 53 deletions
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gpu/internal/rendertest/render_test.go
+16
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@@ -413,6 +413,22 @@ func TestGapsInPath(t *testing.T) {
})
}
func TestOpacity(t *testing.T) {
run(t, func(ops *op.Ops) {
opc1 := paint.PushOpacity(ops, .3)
// Fill screen to exercize the glClear optimization.
paint.FillShape(ops, color.NRGBA{R: 255, A: 255}, clip.Rect{Max: image.Pt(1024, 1024)}.Op())
opc2 := paint.PushOpacity(ops, .6)
paint.FillShape(ops, color.NRGBA{G: 255, A: 255}, clip.Rect{Min: image.Pt(20, 10), Max: image.Pt(64, 128)}.Op())
opc2.Pop()
opc1.Pop()
opc3 := paint.PushOpacity(ops, .6)
paint.FillShape(ops, color.NRGBA{G: 255, A: 255}, clip.Rect{Min: image.Pt(50+20, 10), Max: image.Pt(50+64, 128)}.Op())
opc3.Pop()
}, func(r result) {
})
}
// lerp calculates linear interpolation with color b and p.
func lerp(a, b f32color.RGBA, p float32) f32color.RGBA {
return f32color.RGBA{