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[GPOS] Fix indexing in MarkLigPos 

This was broken in 8708b9e081.

Fixes https://github.com/harfbuzz/harfbuzz/issues/4142
This commit is contained in:
Behdad Esfahbod 2023-03-01 13:32:44 -07:00
parent 01d34763f0
commit c67c0086ef
1 changed files with 7 additions and 7 deletions
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14
src/OT/Layout/GPOS/MarkLigPosFormat1.hh
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@ -126,15 +126,15 @@ struct MarkLigPosFormat1_2
return_trace (false);
}
j = (unsigned) c->last_base;
unsigned idx = (unsigned) c->last_base;
/* Checking that matched glyph is actually a ligature by GDEF is too strong; disabled */
//if (!_hb_glyph_info_is_ligature (&buffer->info[j])) { return_trace (false); }
//if (!_hb_glyph_info_is_ligature (&buffer->info[idx])) { return_trace (false); }
unsigned int lig_index = (this+ligatureCoverage).get_coverage (buffer->info[j].codepoint);
unsigned int lig_index = (this+ligatureCoverage).get_coverage (buffer->info[idx].codepoint);
if (lig_index == NOT_COVERED)
{
buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
buffer->unsafe_to_concat_from_outbuffer (idx, buffer->idx + 1);
return_trace (false);
}
@ -145,7 +145,7 @@ struct MarkLigPosFormat1_2
unsigned int comp_count = lig_attach.rows;
if (unlikely (!comp_count))
{
buffer->unsafe_to_concat_from_outbuffer (skippy_iter.idx, buffer->idx + 1);
buffer->unsafe_to_concat_from_outbuffer (idx, buffer->idx + 1);
return_trace (false);
}
@ -154,7 +154,7 @@ struct MarkLigPosFormat1_2
* can directly use the component index. If not, we attach the mark
* glyph to the last component of the ligature. */
unsigned int comp_index;
unsigned int lig_id = _hb_glyph_info_get_lig_id (&buffer->info[j]);
unsigned int lig_id = _hb_glyph_info_get_lig_id (&buffer->info[idx]);
unsigned int mark_id = _hb_glyph_info_get_lig_id (&buffer->cur());
unsigned int mark_comp = _hb_glyph_info_get_lig_comp (&buffer->cur());
if (lig_id && lig_id == mark_id && mark_comp > 0)
@ -162,7 +162,7 @@ struct MarkLigPosFormat1_2
else
comp_index = comp_count - 1;
return_trace ((this+markArray).apply (c, mark_index, comp_index, lig_attach, classCount, j));
return_trace ((this+markArray).apply (c, mark_index, comp_index, lig_attach, classCount, idx));
}
bool subset (hb_subset_context_t *c) const