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gpu/clip: fix vertex corner positions

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Fixes the 1px overlap of curve quads. Without this patch the rendered quads
were skewed vertically and were 2 pixels shorter in height. The NorthWest
pixels were moved to the SouthWest instead of NorthWest and the SouthEast
pixels were moved to the NorthEast instead of SouthEast.

References: https://todo.sr.ht/~eliasnaur/gio/339
Signed-off-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Walter Werner SCHNEIDER
2025-07-29 15:33:18 +03:00
committed by Elias Naur
parent f45039734f
commit 4c0e526c0b
1 changed files with 6 additions and 6 deletions
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gpu/clip.go
+6 -6
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@@ -19,10 +19,10 @@ type quadSplitter struct {
func encodeQuadTo(data []byte, meta uint32, from, ctrl, to f32.Point) {
// inlined code:
// encodeVertex(data, meta, -1, 1, from, ctrl, to)
// encodeVertex(data, meta, 1, -1, from, ctrl, to)
// encodeVertex(data[vertStride:], meta, 1, 1, from, ctrl, to)
// encodeVertex(data[vertStride*2:], meta, -1, -1, from, ctrl, to)
// encodeVertex(data[vertStride*3:], meta, 1, -1, from, ctrl, to)
// encodeVertex(data[vertStride*3:], meta, -1, 1, from, ctrl, to)
// this code needs to stay in sync with `vertex.encode`.
bo := binary.LittleEndian
@@ -48,10 +48,10 @@ func encodeQuadTo(data []byte, meta uint32, from, ctrl, to f32.Point) {
}
const (
nwCorner = 1*0.25 + 0*0.5
neCorner = 1*0.25 + 1*0.5
swCorner = 0*0.25 + 0*0.5
seCorner = 0*0.25 + 1*0.5
nwCorner = 1*0.5 + 0*0.25
neCorner = 1*0.5 + 1*0.25
swCorner = 0*0.5 + 0*0.25
seCorner = 0*0.5 + 1*0.25
)
func encodeVertex(data []byte, meta uint32, cornerx, cornery int16, from, ctrl, to f32.Point) {