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op/clip,gpu,internal/scene: encode cubic bézier curves natively

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The compute renderer supports cubic curves, so encode them as such.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2021-03-11 18:34:45 +01:00
parent f1ae923a89
commit 9e79cee447
4 changed files with 130 additions and 70 deletions
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internal/scene/scene.go
+29
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@@ -56,6 +56,24 @@ func Line(start, end f32.Point, stroke bool, flags uint32) Command {
}
}
func Cubic(start, ctrl0, ctrl1, end f32.Point, stroke bool) Command {
tag := uint32(OpFillCubic)
if stroke {
tag = uint32(OpStrokeCubic)
}
return Command{
0: tag,
1: math.Float32bits(start.X),
2: math.Float32bits(start.Y),
3: math.Float32bits(ctrl0.X),
4: math.Float32bits(ctrl0.Y),
5: math.Float32bits(ctrl1.X),
6: math.Float32bits(ctrl1.Y),
7: math.Float32bits(end.X),
8: math.Float32bits(end.Y),
}
}
func Quad(start, ctrl, end f32.Point, stroke bool) Command {
tag := uint32(OpFillQuad)
if stroke {
@@ -151,3 +169,14 @@ func DecodeQuad(cmd Command) (from, ctrl, to f32.Point) {
to = f32.Pt(math.Float32frombits(cmd[5]), math.Float32frombits(cmd[6]))
return
}
func DecodeCubic(cmd Command) (from, ctrl0, ctrl1, to f32.Point) {
if cmd[0] != uint32(OpFillCubic) {
panic("invalid command")
}
from = f32.Pt(math.Float32frombits(cmd[1]), math.Float32frombits(cmd[2]))
ctrl0 = f32.Pt(math.Float32frombits(cmd[3]), math.Float32frombits(cmd[4]))
ctrl1 = f32.Pt(math.Float32frombits(cmd[5]), math.Float32frombits(cmd[6]))
to = f32.Pt(math.Float32frombits(cmd[7]), math.Float32frombits(cmd[8]))
return
}