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Position-independent font shaper caching

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Use relative cluster positioning to allow identical texts runs in
different row positions to share the same cache entry.
This commit is contained in:
Jesse Miller
2025-09-06 11:26:23 -06:00
parent e4c3a56242
commit ecf3e2ad7d
2 changed files with 12 additions and 4 deletions
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6
src/renderer/generic.zig
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@@ -2530,7 +2530,7 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
// Advance our index until we reach or pass
// our current x position in the shaper cells.
while (shaper_cells.?[shaper_cells_i].x < x) {
while (shaper_cells.?[shaper_cells_i].x + run.offset < x) {
shaper_cells_i += 1;
}
}
@@ -2769,13 +2769,13 @@ pub fn Renderer(comptime GraphicsAPI: type) type {
// If we encounter a shaper cell to the left of the current
// cell then we have some problems. This logic relies on x
// position monotonically increasing.
assert(cells[shaper_cells_i].x >= x);
assert(cells[shaper_cells_i].x + run.offset >= x);
// NOTE: An assumption is made here that a single cell will never
// be present in more than one shaper run. If that assumption is
// violated, this logic breaks.
while (shaper_cells_i < cells.len and cells[shaper_cells_i].x == x) : ({
while (shaper_cells_i < cells.len and cells[shaper_cells_i].x + run.offset == x) : ({
shaper_cells_i += 1;
}) {
self.addGlyph(