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[layout] Merge forward and backward iterators

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pull/90/head
Behdad Esfahbod 10 years ago
parent 1f038eec3c
commit 696266981d
3 changed files with 23 additions and 62 deletions
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  1. 12
      src/hb-ot-layout-gpos-table.hh
  2. 53
      src/hb-ot-layout-gsubgpos-private.hh
  3. 2
      src/hb-ot-shape-fallback.cc

12
src/hb-ot-layout-gpos-table.hh
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@ -684,7 +684,7 @@ struct PairPosFormat1
unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
hb_apply_context_t::skipping_forward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
return TRACE_RETURN ((this+pairSet[index]).apply (c, &valueFormat1, skippy_iter.idx));
@ -753,7 +753,7 @@ struct PairPosFormat2
unsigned int index = (this+coverage).get_coverage (buffer->cur().codepoint);
if (likely (index == NOT_COVERED)) return TRACE_RETURN (false);
hb_apply_context_t::skipping_forward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
unsigned int len1 = valueFormat1.get_len ();
@ -902,7 +902,7 @@ struct CursivePosFormat1
const EntryExitRecord &this_record = entryExitRecord[(this+coverage).get_coverage (buffer->cur().codepoint)];
if (!this_record.exitAnchor) return TRACE_RETURN (false);
hb_apply_context_t::skipping_forward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
if (!skippy_iter.next ()) return TRACE_RETURN (false);
const EntryExitRecord &next_record = entryExitRecord[(this+coverage).get_coverage (buffer->info[skippy_iter.idx].codepoint)];
@ -1045,7 +1045,7 @@ struct MarkBasePosFormat1
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a non-mark glyph */
hb_apply_context_t::skipping_backward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
do {
if (!skippy_iter.prev ()) return TRACE_RETURN (false);
@ -1149,7 +1149,7 @@ struct MarkLigPosFormat1
if (likely (mark_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a non-mark glyph */
hb_apply_context_t::skipping_backward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
skippy_iter.set_lookup_props (LookupFlag::IgnoreMarks);
if (!skippy_iter.prev ()) return TRACE_RETURN (false);
@ -1265,7 +1265,7 @@ struct MarkMarkPosFormat1
if (likely (mark1_index == NOT_COVERED)) return TRACE_RETURN (false);
/* now we search backwards for a suitable mark glyph until a non-mark glyph */
hb_apply_context_t::skipping_backward_iterator_t skippy_iter (c, buffer->idx, 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, 1);
skippy_iter.set_lookup_props (c->lookup_props & ~LookupFlag::IgnoreFlags);
if (!skippy_iter.prev ()) return TRACE_RETURN (false);

53
src/hb-ot-layout-gsubgpos-private.hh
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@ -390,9 +390,9 @@ struct hb_apply_context_t
const void *match_data;
};
struct skipping_forward_iterator_t
struct skipping_iterator_t
{
inline skipping_forward_iterator_t (hb_apply_context_t *c_,
inline skipping_iterator_t (hb_apply_context_t *c_,
unsigned int start_index_,
unsigned int num_items_,
bool context_match = false) :
@ -421,6 +421,7 @@ struct hb_apply_context_t
}
inline void reject (void) { num_items++; match_glyph_data--; }
inline bool next (void)
{
assert (num_items > 0);
@ -448,47 +449,6 @@ struct hb_apply_context_t
}
return false;
}
unsigned int idx;
protected:
hb_apply_context_t *c;
matcher_t matcher;
const USHORT *match_glyph_data;
unsigned int num_items;
unsigned int end;
};
struct skipping_backward_iterator_t
{
inline skipping_backward_iterator_t (hb_apply_context_t *c_,
unsigned int start_index_,
unsigned int num_items_,
bool context_match = false) :
idx (start_index_),
c (c_),
match_glyph_data (NULL),
num_items (num_items_)
{
matcher.set_lookup_props (c->lookup_props);
/* Ignore ZWNJ if we are matching GSUB context, or matching GPOS. */
matcher.set_ignore_zwnj (context_match || c->table_index == 1);
/* Ignore ZWJ if we are matching GSUB context, or matching GPOS, or if asked to. */
matcher.set_ignore_zwj (context_match || c->table_index == 1 || c->auto_zwj);
if (!context_match)
matcher.set_mask (c->lookup_mask);
matcher.set_syllable (start_index_ == c->buffer->idx ? c->buffer->cur().syllable () : 0);
}
inline void set_lookup_props (unsigned int lookup_props) { matcher.set_lookup_props (lookup_props); }
inline void set_match_func (matcher_t::match_func_t match_func,
const void *match_data,
const USHORT glyph_data[])
{
matcher.set_match_func (match_func, match_data);
match_glyph_data = glyph_data;
}
inline void reject (void) { num_items++; match_glyph_data--; }
inline bool prev (void)
{
assert (num_items > 0);
@ -524,6 +484,7 @@ struct hb_apply_context_t
const USHORT *match_glyph_data;
unsigned int num_items;
unsigned int end;
};
inline bool
@ -737,7 +698,7 @@ static inline bool match_input (hb_apply_context_t *c,
hb_buffer_t *buffer = c->buffer;
hb_apply_context_t::skipping_forward_iterator_t skippy_iter (c, buffer->idx, count - 1);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, buffer->idx, count - 1);
skippy_iter.set_match_func (match_func, match_data, input);
/*
@ -905,7 +866,7 @@ static inline bool match_backtrack (hb_apply_context_t *c,
{
TRACE_APPLY (NULL);
hb_apply_context_t::skipping_backward_iterator_t skippy_iter (c, c->buffer->backtrack_len (), count, true);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, c->buffer->backtrack_len (), count, true);
skippy_iter.set_match_func (match_func, match_data, backtrack);
for (unsigned int i = 0; i < count; i++)
@ -924,7 +885,7 @@ static inline bool match_lookahead (hb_apply_context_t *c,
{
TRACE_APPLY (NULL);
hb_apply_context_t::skipping_forward_iterator_t skippy_iter (c, c->buffer->idx + offset - 1, count, true);
hb_apply_context_t::skipping_iterator_t skippy_iter (c, c->buffer->idx + offset - 1, count, true);
skippy_iter.set_match_func (match_func, match_data, lookahead);
for (unsigned int i = 0; i < count; i++)

2
src/hb-ot-shape-fallback.cc
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@ -447,7 +447,7 @@ _hb_ot_shape_fallback_kern (const hb_ot_shape_plan_t *plan,
hb_glyph_position_t *pos = buffer->pos;
for (unsigned int idx = 0; idx < count;)
{
OT::hb_apply_context_t::skipping_forward_iterator_t skippy_iter (&c, idx, 1);
OT::hb_apply_context_t::skipping_iterator_t skippy_iter (&c, idx, 1);
if (!skippy_iter.next ())
{
idx++;

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