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[morx] Implement InsertionChain

This commit is contained in:
Behdad Esfahbod 2018-09-17 19:29:34 +02:00
parent d8d1e7df00
commit 388ab91642
1 changed files with 36 additions and 57 deletions
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93
src/hb-aat-layout-morx-table.hh
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@ -608,80 +608,59 @@ struct InsertionSubtable
hb_buffer_t *buffer = driver->buffer;
unsigned int flags = entry->flags;
if (0)
c->sanitizer.check_range (nullptr, 0);
#if 0
if (flags & SetComponent)
if (entry->data.markedInsertIndex != 0xFFFF)
{
if (unlikely (match_length >= ARRAY_LENGTH (match_positions)))
return false;
unsigned int count = (entry->flags & MarkedInsertCount);
unsigned int start = entry->data.markedInsertIndex;
const GlyphID *glyphs = &insertionAction[start];
if (unlikely (!c->sanitizer.check_array (glyphs, count))) return false;
/* Never mark same index twice, in case DontAdvance was used... */
if (match_length && match_positions[match_length - 1] == buffer->out_len)
match_length--;
bool before = entry->flags & MarkedInsertBefore;
match_positions[match_length++] = buffer->out_len;
if (unlikely (!mark_set)) return false;
unsigned int end = buffer->out_len;
buffer->move_to (mark);
if (!before)
buffer->copy_glyph ();
/* TODO We ignore KashidaLike setting. */
for (unsigned int i = 0; i < count; i++)
buffer->output_glyph (glyphs[i]);
if (!before)
buffer->skip_glyph ();
buffer->move_to (end + count);
}
if (flags & PerformAction)
if (entry->data.currentInsertIndex != 0xFFFF)
{
unsigned int count = (entry->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;
unsigned int end = buffer->out_len;
unsigned int action_idx = entry->data.ligActionIndex;
unsigned int action;
unsigned int ligature_idx = 0;
do
{
if (unlikely (!match_length))
return false;
buffer->move_to (match_positions[--match_length]);
if (!before)
buffer->copy_glyph ();
/* TODO We ignore KashidaLike setting. */
for (unsigned int i = 0; i < count; i++)
buffer->output_glyph (glyphs[i]);
if (!before)
buffer->skip_glyph ();
const HBUINT32 &actionData = ligAction[action_idx];
if (unlikely (!actionData.sanitize (&c->sanitizer))) return false;
action = actionData;
uint32_t uoffset = action & LigActionOffset;
if (uoffset & 0x20000000)
uoffset += 0xC0000000;
int32_t offset = (int32_t) uoffset;
unsigned int component_idx = buffer->cur().codepoint + offset;
const HBUINT16 &componentData = component[component_idx];
if (unlikely (!componentData.sanitize (&c->sanitizer))) return false;
ligature_idx += componentData;
if (action & (LigActionStore | LigActionLast))
{
const GlyphID &ligatureData = ligature[ligature_idx];
if (unlikely (!ligatureData.sanitize (&c->sanitizer))) return false;
hb_codepoint_t lig = ligatureData;
match_positions[match_length++] = buffer->out_len;
buffer->replace_glyph (lig);
//ligature_idx = 0; // XXX Yes or no?
}
else
{
buffer->skip_glyph ();
end--;
}
/* TODO merge_clusters / unsafe_to_break */
action_idx++;
}
while (!(action & LigActionLast));
buffer->move_to (end);
}
#endif
if (flags & SetMark)
{
mark_set = true;
mark = buffer->idx;
mark = buffer->out_len;
}
return true;
}