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op/clip, gpu: split complex curves in package gpu instead

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This is a first step towards supporting affine drawing transforms.
The rendering algorithm relies on quadratic curves that do not cross
x = 0 more than once, thus curves must be split after any rotation/shear
transforms. Move this logic and the generation of vertices to package gpu.
Also close all curves and draw zero-width edges as preparation for
transform since the will no longer implicitly be vertical with no
effect.

This commit will severely affect performance since vertexes are now
transformed also for cached items, using cpu resources.

Signed-off-by: Viktor <viktor.ogeman@gmail.com>
This commit is contained in:
Viktor
2020-06-20 23:29:48 +02:00
committed by Elias Naur
parent ef70b9252e
commit 5b277757cf
6 changed files with 240 additions and 173 deletions
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internal/ops/ops.go
+27
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@@ -11,6 +11,33 @@ import (
"gioui.org/op"
)
const QuadSize = 4 * 2 * 3
type Quad struct {
From, Ctrl, To f32.Point
}
func EncodeQuad(d []byte, q Quad) {
bo := binary.LittleEndian
bo.PutUint32(d[0:], math.Float32bits(q.From.X))
bo.PutUint32(d[4:], math.Float32bits(q.From.Y))
bo.PutUint32(d[8:], math.Float32bits(q.Ctrl.X))
bo.PutUint32(d[12:], math.Float32bits(q.Ctrl.Y))
bo.PutUint32(d[16:], math.Float32bits(q.To.X))
bo.PutUint32(d[20:], math.Float32bits(q.To.Y))
}
func DecodeQuad(d []byte) (q Quad) {
bo := binary.LittleEndian
q.From.X = math.Float32frombits(bo.Uint32(d[0:]))
q.From.Y = math.Float32frombits(bo.Uint32(d[4:]))
q.Ctrl.X = math.Float32frombits(bo.Uint32(d[8:]))
q.Ctrl.Y = math.Float32frombits(bo.Uint32(d[12:]))
q.To.X = math.Float32frombits(bo.Uint32(d[16:]))
q.To.Y = math.Float32frombits(bo.Uint32(d[20:]))
return
}
func DecodeTransformOp(d []byte) op.TransformOp {
bo := binary.LittleEndian
if opconst.OpType(d[0]) != opconst.TypeTransform {