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[coretext] Attach marks to base clusters 

Fixes https://githu.com/behdad/harfbuzz/issues/49
to the extent that it can be fixed.
This commit is contained in:
Behdad Esfahbod 2014-08-11 15:29:18 -04:00
parent 3c41ccb535
commit 624a299b82
1 changed files with 16 additions and 0 deletions
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16
src/hb-coretext.cc
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@ -428,6 +428,22 @@ _hb_coretext_shape (hb_shape_plan_t *shape_plan,
hb_coretext_shaper_face_data_t *face_data = HB_SHAPER_DATA_GET (face);
hb_coretext_shaper_font_data_t *font_data = HB_SHAPER_DATA_GET (font);
/* Attach marks to their bases, to match the 'ot' shaper.
* Adapted from hb-ot-shape:hb_form_clusters().
* Note that this only makes us be closer to the 'ot' shaper,
* but by no means the same. For example, if there's
* B1 M1 B2 M2, and B1-B2 form a ligature, M2's cluster will
* continue pointing to B2 even though B2 was merged into B1's
* cluster... */
{
hb_unicode_funcs_t *unicode = buffer->unicode;
unsigned int count = buffer->len;
hb_glyph_info_t *info = buffer->info;
for (unsigned int i = 1; i < count; i++)
if (HB_UNICODE_GENERAL_CATEGORY_IS_MARK (unicode->general_category (info[i].codepoint)))
buffer->merge_clusters (i - 1, i + 1);
}
hb_auto_array_t<feature_record_t> feature_records;
hb_auto_array_t<range_record_t> range_records;