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[GSUB] ContextSubst format 1

This commit is contained in:
Behdad Esfahbod 2009-05-08 19:09:17 -04:00
parent f702295103
commit 25c6c9a3f6
1 changed files with 45 additions and 7 deletions
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52
src/hb-ot-layout-gsub-private.h
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@ -568,9 +568,6 @@ DEFINE_NULL (LigatureSubst, 2);
struct SubstLookupRecord {
/* TODO */
private:
USHORT sequenceIndex; /* Index into current glyph
* sequence--first glyph = 0 */
USHORT lookupListIndex; /* Lookup to apply to that
@ -584,7 +581,36 @@ struct SubRule {
private:
DEFINE_ARRAY_TYPE (GlyphID, input, (glyphCount ? glyphCount - 1 : 0));
/* XXX */
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
unsigned int i, j;
unsigned int property;
unsigned int count = glyphCount;
if (HB_UNLIKELY (buffer->in_pos + count > buffer->in_length ||
context_length < count))
return false; /* Not enough glyphs in input or context */
for (i = 1, j = buffer->in_pos + 1; i < count; i++, j++) {
while (!_hb_ot_layout_check_glyph_property (layout, IN_ITEM (j), lookup_flag, &property)) {
if (HB_UNLIKELY (j + count - i == buffer->in_length))
return false;
j++;
}
if (HB_LIKELY (IN_GLYPH(j) != (*this)[i - 1]))
return false;
}
/*
return Do_ContextSubst( gsub, sr[k].GlyphCount,
sr[k].SubstCount, sr[k].SubstLookupRecord,
buffer,
nesting_level );
*/
}
private:
USHORT glyphCount; /* Total number of glyphs in input
@ -600,11 +626,23 @@ DEFINE_NULL_ASSERT_SIZE (SubRule, 4);
struct SubRuleSet {
friend struct ChainSubstFormat1;
friend struct ContextSubstFormat1;
private:
DEFINE_OFFSET_ARRAY_TYPE (SubRule, subRule, subRuleCount);
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
unsigned int num_rules = get_len ();
for (unsigned int i = 0; i < num_rules; i++) {
const SubRule &rule = (*this)[i];
if (rule.substitute (SUBTABLE_SUBSTITUTE_ARGS))
return true;
}
return false;
}
private:
USHORT subRuleCount; /* Number of SubRule tables */
Offset subRule[]; /* Array of offsets to SubRule
@ -633,8 +671,8 @@ struct ContextSubstFormat1 {
unsigned int index = get_glyph_coverage (glyph_id);
//const SubRuleSet &lig_set = (*this)[index];
//return lig_set.substitute_ligature (SUBTABLE_SUBSTITUTE_ARGS, first_is_mark);
const SubRuleSet &rule_set = (*this)[index];
return rule_set.substitute (SUBTABLE_SUBSTITUTE_ARGS);
}
private: