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[GSUB] Towards Context subtitutes

This commit is contained in:
Behdad Esfahbod 2009-05-06 00:12:29 -04:00
parent c9c6a78aec
commit cdb317bc4e
1 changed files with 111 additions and 32 deletions
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143
src/hb-ot-layout-gsub-private.h
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@ -578,8 +578,64 @@ struct SubstLookupRecord {
};
DEFINE_NULL_ASSERT_SIZE (SubstLookupRecord, 4);
struct SubRule {
friend struct SubRuleSet;
private:
DEFINE_ARRAY_TYPE (GlyphID, input, (glyphCount ? glyphCount - 1 : 0));
/* XXX */
private:
USHORT glyphCount; /* Total number of glyphs in input
* glyph sequence--includes the first
* glyph */
USHORT substCount; /* Number of SubstLookupRecords */
GlyphID input[]; /* Array of input GlyphIDs--start with
* second glyph */
SubstLookupRecord substLookupRecord[];/* Array of SubstLookupRecords--in
* design order */
};
DEFINE_NULL_ASSERT_SIZE (SubRule, 4);
struct SubRuleSet {
friend struct ChainSubstFormat1;
private:
DEFINE_OFFSET_ARRAY_TYPE (SubRule, subRule, subRuleCount);
private:
USHORT subRuleCount; /* Number of SubRule tables */
Offset subRule[]; /* Array of offsets to SubRule
* tables--from beginning of SubRuleSet
* table--ordered by preference */
};
DEFINE_NULL_ASSERT_SIZE (SubRuleSet, 2);
struct ContextSubstFormat1 {
/* TODO */
friend struct ContextSubst;
private:
/* SubRuleSet tables, in Coverage Index order */
DEFINE_OFFSET_ARRAY_TYPE (SubRuleSet, subRuleSet, subRuleSetCount);
DEFINE_GET_ACCESSOR (Coverage, coverage, coverage);
DEFINE_GET_GLYPH_COVERAGE (glyph_coverage);
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
unsigned int property;
if (!_hb_ot_layout_check_glyph_property (layout, IN_CURITEM (), lookup_flag, &property))
return false;
hb_codepoint_t glyph_id = IN_CURGLYPH ();
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);
}
private:
USHORT substFormat; /* Format identifier--format = 1 */
@ -594,34 +650,15 @@ struct ContextSubstFormat1 {
};
ASSERT_SIZE (ContextSubstFormat1, 6);
struct SubRuleSet {
/* TODO */
private:
USHORT subRuleCount; /* Number of SubRule tables */
Offset subRule[]; /* Array of offsets to SubRule
* tables--from beginning of SubRuleSet
* table--ordered by preference */
};
DEFINE_NULL_ASSERT_SIZE (SubRuleSet, 2);
struct SubRule {
/* TODO */
private:
USHORT glyphCount; /* Total number of glyphs in input
* glyph sequence--includes the first
* glyph */
USHORT substCount; /* Number of SubstLookupRecords */
GlyphID input[]; /* Array of input GlyphIDs--start with
* second glyph */
SubstLookupRecord substLookupRecord[];/* Array of SubstLookupRecords--in
* design order */
};
DEFINE_NULL_ASSERT_SIZE (SubRule, 4);
struct ContextSubstFormat2 {
/* TODO */
friend struct ContextSubst;
private:
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
return false;
}
private:
USHORT substFormat; /* Format identifier--format = 2 */
@ -665,7 +702,14 @@ struct SubClassRule {
DEFINE_NULL_ASSERT_SIZE (SubClassRule, 4);
struct ContextSubstFormat3 {
/* TODO */
friend struct ContextSubst;
private:
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
return false;
}
private:
USHORT substFormat; /* Format identifier--format = 3 */
@ -681,6 +725,41 @@ struct ContextSubstFormat3 {
};
ASSERT_SIZE (ContextSubstFormat3, 6);
struct ContextSubst {
friend struct SubstLookupSubTable;
private:
unsigned int get_size (void) const {
switch (u.substFormat) {
case 1: return sizeof (u.format1);
case 2: return sizeof (u.format2);
case 3: return sizeof (u.format3);
default:return sizeof (u.substFormat);
}
}
inline bool substitute (SUBTABLE_SUBSTITUTE_ARGS_DEF) const {
switch (u.substFormat) {
case 1: return u.format1.substitute (SUBTABLE_SUBSTITUTE_ARGS);
case 2: return u.format2.substitute (SUBTABLE_SUBSTITUTE_ARGS);
case 3: return u.format3.substitute (SUBTABLE_SUBSTITUTE_ARGS);
default:return false;
}
}
private:
union {
USHORT substFormat; /* Format identifier */
ContextSubstFormat1 format1;
ContextSubstFormat2 format2;
ContextSubstFormat3 format3;
} u;
};
DEFINE_NULL (ContextSubst, 2);
struct ChainContextSubstFormat1 {
/* TODO */
@ -935,8 +1014,8 @@ struct SubstLookupSubTable {
case GSUB_Multiple: return u.multiple.get_size ();
case GSUB_Alternate: return u.alternate.get_size ();
case GSUB_Ligature: return u.ligature.get_size ();
/*
case GSUB_Context:
/*
case GSUB_ChainingContext:
*/
case GSUB_Extension: return u.extension.get_size ();
@ -954,8 +1033,8 @@ struct SubstLookupSubTable {
case GSUB_Multiple: return u.multiple.substitute (SUBTABLE_SUBSTITUTE_ARGS);
case GSUB_Alternate: return u.alternate.substitute (SUBTABLE_SUBSTITUTE_ARGS);
case GSUB_Ligature: return u.ligature.substitute (SUBTABLE_SUBSTITUTE_ARGS);
/*
case GSUB_Context: return u.context.substitute (SUBTABLE_SUBSTITUTE_ARGS);
/*
case GSUB_ChainingContext: return u.chainingContext.substitute (SUBTABLE_SUBSTITUTE_ARGS);
*/
case GSUB_Extension: return u.extension.substitute (SUBTABLE_SUBSTITUTE_ARGS);
@ -973,8 +1052,8 @@ struct SubstLookupSubTable {
MultipleSubst multiple;
AlternateSubst alternate;
LigatureSubst ligature;
/*
ContextSubst context;
/*
ChainingContextSubst chainingContext;
*/
ExtensionSubst extension;