21 lines
950 B
Diff
21 lines
950 B
Diff
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diff -urN harfbuzz-1.7.5.old/src/hb-ot-layout-gsubgpos-private.hh harfbuzz-1.7.5/src/hb-ot-layout-gsubgpos-private.hh
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--- harfbuzz-1.7.5.old/src/hb-ot-layout-gsubgpos-private.hh 2018-01-27 07:43:07.000000000 +0530
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+++ harfbuzz-1.7.5/src/hb-ot-layout-gsubgpos-private.hh 2023-09-25 12:18:00.277228938 +0530
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@@ -368,7 +368,15 @@
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inline bool prev (void)
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{
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assert (num_items > 0);
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- while (idx >= num_items)
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+ unsigned stop = num_items - 1;
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+
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+ /* When looking back, limit how far we search; this function is mostly
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+ * used for looking back for base glyphs when attaching marks. If we
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+ * don't limit, we can get O(n^2) behavior where n is the number of
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+ * consecutive marks. */
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+ stop = (unsigned) ((int) stop >= (int) idx - HB_MAX_CONTEXT_LENGTH ? stop : (int) idx - HB_MAX_CONTEXT_LENGTH);
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+
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+ while (idx > stop)
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{
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idx--;
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const hb_glyph_info_t &info = c->buffer->out_info[idx];
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