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[GSUB] Further adjustments to mark-attachment vs ligation interaction

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The d1d69ec52e change broke Kannada badly,
since it was ligating consonants, pushing matra out, and then ligating
with the matra.  Adjust for that.  See comments.
This commit is contained in:
Behdad Esfahbod 2012-07-30 01:46:34 -04:00
parent 0aef425e25
commit a973b5ce86
2 changed files with 9 additions and 3 deletions
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11
src/hb-ot-layout-gsub-table.hh
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@ -522,7 +522,11 @@ struct Ligature
* - Ligatures cannot be formed across glyphs attached to different components * - Ligatures cannot be formed across glyphs attached to different components
* of previous ligatures. Eg. the sequence is LAM,SHADDA,LAM,FATHA,HEH, and * of previous ligatures. Eg. the sequence is LAM,SHADDA,LAM,FATHA,HEH, and
* LAM,LAM,HEH form a ligature, leaving SHADDA,FATHA next to eachother. * LAM,LAM,HEH form a ligature, leaving SHADDA,FATHA next to eachother.
* However, it would be wrong to ligate that SHADDA,FATHA sequence. * However, it would be wrong to ligate that SHADDA,FATHA sequence.o
* There is an exception to this: If a ligature tries ligating with marks that
* belong to it itself, go ahead, assuming that the font designer knows what
* they are doing (otherwise it can break Indic stuff when a matra wants to
* ligate with a conjunct...)
*/ */
bool is_mark_ligature = !!(c->property & HB_OT_LAYOUT_GLYPH_CLASS_MARK); bool is_mark_ligature = !!(c->property & HB_OT_LAYOUT_GLYPH_CLASS_MARK);
@ -543,6 +547,7 @@ struct Ligature
unsigned int this_lig_id = get_lig_id (c->buffer->info[skippy_iter.idx]); unsigned int this_lig_id = get_lig_id (c->buffer->info[skippy_iter.idx]);
unsigned int this_lig_comp = get_lig_comp (c->buffer->info[skippy_iter.idx]); unsigned int this_lig_comp = get_lig_comp (c->buffer->info[skippy_iter.idx]);
if (first_lig_id && first_lig_comp) { if (first_lig_id && first_lig_comp) {
/* If first component was attached to a previous ligature component, /* If first component was attached to a previous ligature component,
* all subsequent components should be attached to the same ligature * all subsequent components should be attached to the same ligature
@ -552,8 +557,8 @@ struct Ligature
} else { } else {
/* If first component was NOT attached to a previous ligature component, /* If first component was NOT attached to a previous ligature component,
* all subsequent components should also NOT be attached to any ligature * all subsequent components should also NOT be attached to any ligature
* component, otherwise we shouldn't ligate them. */ * component, unless they are attached to the first component itself! */
if (this_lig_id && this_lig_comp) if (this_lig_id && this_lig_comp && (this_lig_id != first_lig_id))
return TRACE_RETURN (false); return TRACE_RETURN (false);
} }

1
test/shaping/texts/in-tree/shaper-indic/indic/script-kannada/misc/misc.txt
View File

@ -16,3 +16,4 @@
ಕೈ ಕೈ
ಕೋ ಕೋ
ಕ್ಷ ಕ್ಷ
ಕ್ಷಿ