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[layout] Limit how far we skip when looking back 

See comments.
This commit is contained in:
Behdad Esfahbod 2023-02-01 20:00:43 -07:00
parent d18fd3f7eb
commit 85be877925
1 changed files with 7 additions and 0 deletions
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7
src/hb-ot-layout-gsubgpos.hh
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@ -578,6 +578,13 @@ struct hb_ot_apply_context_t :
unsigned stop = num_items - 1; unsigned stop = num_items - 1;
if (c->buffer->flags & HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT) if (c->buffer->flags & HB_BUFFER_FLAG_PRODUCE_UNSAFE_TO_CONCAT)
stop = 1 - 1; stop = 1 - 1;
/* When looking back, limit how far we search; this function is mostly
* used for looking back for base glyphs when attaching marks. If we
* don't limit, we can get O(n^2) behavior where n is the number of
* consecutive marks. */
stop = (unsigned) hb_max ((int) stop, (int) idx - HB_MAX_CONTEXT_LENGTH);
while (idx > stop) while (idx > stop)
{ {
idx--; idx--;