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[morx] Improve buffer position in Insertion w DontAdvance and wo 

Just speculation. Needs tests to determine which is correct behavior.
This commit is contained in:
Behdad Esfahbod 2018-09-19 16:02:56 -04:00
parent 388ab91642
commit 041a08de3d
1 changed files with 18 additions and 5 deletions
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23
src/hb-aat-layout-morx-table.hh
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@ -610,12 +610,12 @@ struct InsertionSubtable
if (entry->data.markedInsertIndex != 0xFFFF)
{
unsigned int count = (entry->flags & MarkedInsertCount);
unsigned int count = (flags & MarkedInsertCount);
unsigned int start = entry->data.markedInsertIndex;
const GlyphID *glyphs = &insertionAction[start];
if (unlikely (!c->sanitizer.check_array (glyphs, count))) return false;
bool before = entry->flags & MarkedInsertBefore;
bool before = flags & MarkedInsertBefore;
if (unlikely (!mark_set)) return false;
@ -635,12 +635,12 @@ struct InsertionSubtable
if (entry->data.currentInsertIndex != 0xFFFF)
{
unsigned int count = (entry->flags & CurrentInsertCount) >> 5;
unsigned int count = (flags & CurrentInsertCount) >> 5;
unsigned int start = entry->data.currentInsertIndex;
const GlyphID *glyphs = &insertionAction[start];
if (unlikely (!c->sanitizer.check_array (glyphs, count))) return false;
bool before = entry->flags & CurrentInsertBefore;
bool before = flags & CurrentInsertBefore;
unsigned int end = buffer->out_len;
@ -652,7 +652,20 @@ struct InsertionSubtable
if (!before)
buffer->skip_glyph ();
buffer->move_to (end);
/* Humm. Not sure where to move to. There's this wording under
* DontAdvance flag:
*
* "If set, don't update the glyph index before going to the new state.
* This does not mean that the glyph pointed to is the same one as
* before. If you've made insertions immediately downstream of the
* current glyph, the next glyph processed would in fact be the first
* one inserted."
*
* This suggests that if DontAdvance is NOT set, we should move to
* end+count. If it *was*, then move to end, such that newly inserted
* glyphs are now visible.
*/
buffer->move_to ((flags & DontAdvance) ? end : end + count);
}
if (flags & SetMark)