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backdrop: repair unsound optimization

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Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur 2020-12-24 11:41:19 +01:00
parent 8b62022749
commit ef4ec772ad
2 changed files with 4 additions and 1 deletions
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5
piet-gpu/shader/backdrop.comp
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@ -54,7 +54,10 @@ void main() {
Path path = Path_read(path_ref); Path path = Path_read(path_ref);
sh_row_width[th_ix] = path.bbox.z - path.bbox.x; sh_row_width[th_ix] = path.bbox.z - path.bbox.x;
row_count = path.bbox.w - path.bbox.y; row_count = path.bbox.w - path.bbox.y;
if (row_count == 1) { // Paths that don't cross tile top edges don't have backdrops.
// Don't apply the optimization to paths that may cross the y = 0
// top edge, but clipped to 1 row.
if (row_count == 1 && path.bbox.y > 0) {
// Note: this can probably be expanded to width = 2 as // Note: this can probably be expanded to width = 2 as
// long as it doesn't cross the left edge. // long as it doesn't cross the left edge.
row_count = 0; row_count = 0;

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piet-gpu/shader/backdrop.spv
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