21 lines
872 B
Diff
21 lines
872 B
Diff
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diff -urN harfbuzz-2.7.4.old/src/hb-ot-layout-gsubgpos.hh harfbuzz-2.7.4/src/hb-ot-layout-gsubgpos.hh
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--- harfbuzz-2.7.4.old/src/hb-ot-layout-gsubgpos.hh 2020-12-27 05:31:18.000000000 +0530
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+++ harfbuzz-2.7.4/src/hb-ot-layout-gsubgpos.hh 2023-09-09 18:11:07.014324408 +0530
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@@ -468,7 +468,15 @@
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bool prev ()
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{
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assert (num_items > 0);
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- while (idx > num_items - 1)
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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) hb_max ((int) 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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