[HB] Start ChainContext and ReverseChainSingleSubst lookups
This commit is contained in:
Behdad Esfahbod
parent
433f4aea74
commit
ca5290f499
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@ -461,6 +461,7 @@ ASSERT_SIZE (LigatureSubst, 2);
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static inline bool substitute_lookup (LOOKUP_ARGS_DEF, unsigned int lookup_index);
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struct ContextSubst : Context {
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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@ -470,184 +471,11 @@ struct ContextSubst : Context {
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ASSERT_SIZE (ContextSubst, 2);
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struct ChainSubRule {
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/* TODO */
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private:
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USHORT backtrackGlyphCount; /* Total number of glyphs in the
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* backtrack sequence (number of
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* glyphs to be matched before the
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* first glyph) */
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GlyphID backtrack[]; /* Array of backtracking GlyphID's
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* (to be matched before the input
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* sequence) */
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USHORT inputGlyphCount; /* Total number of glyphs in the input
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* sequence (includes the first glyph) */
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GlyphID input[]; /* Array of input GlyphIDs (start with
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* second glyph) */
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USHORT lookaheadGlyphCount; /* Total number of glyphs in the look
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* ahead sequence (number of glyphs to
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* be matched after the input sequence) */
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GlyphID lookAhead[]; /* Array of lookahead GlyphID's (to be
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* matched after the input sequence) */
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USHORT substCount; /* Number of LookupRecords */
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LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
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* design order) */
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};
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ASSERT_SIZE (ChainSubRule, 8);
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struct ChainSubRuleSet {
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/* TODO */
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private:
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USHORT chainSubRuleCount; /* Number of ChainSubRule tables */
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Offset chainSubRule[]; /* Array of offsets to ChainSubRule
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* tables--from beginning of
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* ChainSubRuleSet table--ordered
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* by preference */
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};
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ASSERT_SIZE (ChainSubRuleSet, 2);
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struct ChainContextSubstFormat1 {
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/* TODO */
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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return false;
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}
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private:
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USHORT format; /* Format identifier--format = 1 */
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Offset coverage; /* Offset to Coverage table--from
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* beginning of Substitution table */
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USHORT chainSubRuleSetCount; /* Number of ChainSubRuleSet
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* tables--must equal GlyphCount in
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* Coverage table */
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Offset chainSubRuleSet[]; /* Array of offsets to ChainSubRuleSet
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* tables--from beginning of
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* Substitution table--ordered by
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* Coverage Index */
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};
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ASSERT_SIZE (ChainContextSubstFormat1, 6);
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struct ChainSubClassRule {
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/* TODO */
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private:
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USHORT backtrackGlyphCount; /* Total number of glyphs in the
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* backtrack sequence (number of
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* glyphs to be matched before the
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* first glyph) */
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USHORT backtrack[]; /* Array of backtracking classes (to be
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* matched before the input sequence) */
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USHORT inputGlyphCount; /* Total number of classes in the input
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* sequence (includes the first class) */
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USHORT input[]; /* Array of input classes(start with
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* second class; to be matched with
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* the input glyph sequence) */
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USHORT lookaheadGlyphCount; /* Total number of classes in the
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* look ahead sequence (number of
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* classes to be matched after the
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* input sequence) */
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USHORT lookAhead[]; /* Array of lookahead classes (to be
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* matched after the input sequence) */
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USHORT substCount; /* Number of LookupRecords */
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LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
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* design order) */
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};
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ASSERT_SIZE (ChainSubClassRule, 8);
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struct ChainSubClassSet {
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/* TODO */
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private:
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USHORT chainSubClassRuleCnt; /* Number of ChainSubClassRule tables */
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Offset chainSubClassRule[]; /* Array of offsets
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* to ChainSubClassRule
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* tables--from beginning of
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* ChainSubClassSet--ordered by
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* preference */
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};
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ASSERT_SIZE (ChainSubClassSet, 2);
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struct ChainContextSubstFormat2 {
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/* TODO */
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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return false;
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}
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private:
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USHORT format; /* Format identifier--format = 2 */
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Offset coverage; /* Offset to Coverage table--from
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* beginning of Substitution table */
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Offset backtrackClassDef; /* Offset to glyph ClassDef table
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* containing backtrack sequence
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* data--from beginning of Substitution
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* table */
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Offset inputClassDef; /* Offset to glyph ClassDef
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* table containing input sequence
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* data--from beginning of Substitution
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* table */
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Offset lookaheadClassDef; /* Offset to glyph ClassDef table
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* containing lookahead sequence
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* data--from beginning of Substitution
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* table */
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USHORT chainSubClassSetCnt; /* Number of ChainSubClassSet tables */
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Offset chainSubClassSet[]; /* Array of offsets to ChainSubClassSet
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* tables--from beginning of
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* Substitution table--ordered by input
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* class--may be NULL */
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};
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ASSERT_SIZE (ChainContextSubstFormat2, 12);
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struct ChainContextSubstFormat3 {
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/* TODO */
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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return false;
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}
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private:
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USHORT format; /* Format identifier--format = 3 */
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USHORT backtrackGlyphCount; /* Number of glyphs in the backtracking
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* sequence */
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Offset backtrackCoverage[]; /* Array of offsets to coverage tables
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* in backtracking sequence, in glyph
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* sequence order */
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USHORT inputGlyphCount; /* Number of glyphs in input sequence */
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Offset inputCoverage[]; /* Array of offsets to coverage
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* tables in input sequence, in glyph
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* sequence order */
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USHORT lookaheadGlyphCount; /* Number of glyphs in lookahead
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* sequence */
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Offset lookaheadCoverage[]; /* Array of offsets to coverage tables
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* in lookahead sequence, in glyph
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* sequence order */
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USHORT substCount; /* Number of LookupRecords */
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LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
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* design order */
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};
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ASSERT_SIZE (ChainContextSubstFormat3, 10);
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struct ChainContextSubst {
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friend struct SubstLookupSubTable;
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private:
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struct ChainContextSubst : ChainContext {
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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switch (u.format) {
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case 1: return u.format1->substitute (LOOKUP_ARGS);
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case 2: return u.format2->substitute (LOOKUP_ARGS);
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case 3: return u.format3->substitute (LOOKUP_ARGS);
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default:return false;
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}
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return this->apply (LOOKUP_ARGS, substitute_lookup);
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}
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private:
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union {
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USHORT format; /* Format identifier */
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ChainContextSubstFormat1 format1[];
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ChainContextSubstFormat2 format2[];
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ChainContextSubstFormat3 format3[];
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} u;
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};
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ASSERT_SIZE (ChainContextSubst, 2);
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@ -703,9 +531,11 @@ struct ExtensionSubst {
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ASSERT_SIZE (ExtensionSubst, 2);
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struct ReverseChainSingleSubstFormat1 {
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/* TODO */
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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return false;
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}
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private:
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USHORT format; /* Format identifier--format = 1 */
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@ -723,24 +553,47 @@ struct ReverseChainSingleSubstFormat1 {
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* sequence order */
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USHORT glyphCount; /* Number of GlyphIDs in the Substitute
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* array */
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GlyphID substitute[]; /* Array of substitute
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GlyphID substituteGlyphs[]; /* Array of substitute
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* GlyphIDs--ordered by Coverage Index */
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};
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ASSERT_SIZE (ReverseChainSingleSubstFormat1, 10);
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struct ReverseChainSingleSubst {
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friend struct SubstLookupSubTable;
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private:
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inline bool substitute (LOOKUP_ARGS_DEF) const {
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switch (u.format) {
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case 1: return u.format1->substitute (LOOKUP_ARGS);
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default:return false;
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}
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}
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private:
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union {
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USHORT format; /* Format identifier */
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ReverseChainSingleSubstFormat1 format1[];
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} u;
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};
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ASSERT_SIZE (ReverseChainSingleSubst, 2);
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/*
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* SubstLookup
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*/
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enum {
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GSUB_Single = 1,
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GSUB_Multiple = 2,
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GSUB_Alternate = 3,
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GSUB_Ligature = 4,
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GSUB_Context = 5,
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GSUB_ChainingContext = 6,
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GSUB_Extension = 7,
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GSUB_ReverseChainingContextSingle = 8,
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GSUB_Single = 1,
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GSUB_Multiple = 2,
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GSUB_Alternate = 3,
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GSUB_Ligature = 4,
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GSUB_Context = 5,
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GSUB_ChainContext = 6,
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GSUB_Extension = 7,
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GSUB_ReverseChainSingle = 8,
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};
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struct SubstLookupSubTable {
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@ -751,37 +604,29 @@ struct SubstLookupSubTable {
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unsigned int lookup_type) const {
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switch (lookup_type) {
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case GSUB_Single: return u.single->substitute (LOOKUP_ARGS);
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case GSUB_Multiple: return u.multiple->substitute (LOOKUP_ARGS);
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case GSUB_Alternate: return u.alternate->substitute (LOOKUP_ARGS);
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case GSUB_Ligature: return u.ligature->substitute (LOOKUP_ARGS);
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case GSUB_Context: return u.context->substitute (LOOKUP_ARGS);
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/*
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case GSUB_ChainingContext: return u.chainingContext->substitute (LOOKUP_ARGS);
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*/
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case GSUB_Extension: return u.extension->substitute (LOOKUP_ARGS);
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/*
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case GSUB_ReverseChainingContextSingle: return u.reverseChainingContextSingle->substitute (LOOKUP_ARGS);
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*/
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case GSUB_Single: return u.single->substitute (LOOKUP_ARGS);
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case GSUB_Multiple: return u.multiple->substitute (LOOKUP_ARGS);
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case GSUB_Alternate: return u.alternate->substitute (LOOKUP_ARGS);
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case GSUB_Ligature: return u.ligature->substitute (LOOKUP_ARGS);
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case GSUB_Context: return u.context->substitute (LOOKUP_ARGS);
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case GSUB_ChainContext: return u.chainingContext->substitute (LOOKUP_ARGS);
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case GSUB_Extension: return u.extension->substitute (LOOKUP_ARGS);
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case GSUB_ReverseChainSingle: return u.reverseChainContextSingle->substitute (LOOKUP_ARGS);
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default:return false;
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}
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}
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private:
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union {
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USHORT format;
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SingleSubst single[];
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MultipleSubst multiple[];
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AlternateSubst alternate[];
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LigatureSubst ligature[];
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ContextSubst context[];
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/*
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ChainingContextSubst chainingContext[];
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*/
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ExtensionSubst extension[];
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/*
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ReverseChainingContextSingleSubst reverseChainingContextSingle[];
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*/
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USHORT format;
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SingleSubst single[];
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MultipleSubst multiple[];
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AlternateSubst alternate[];
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LigatureSubst ligature[];
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ContextSubst context[];
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ChainContextSubst chainingContext[];
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ExtensionSubst extension[];
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ReverseChainSingleSubst reverseChainContextSingle[];
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} u;
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};
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ASSERT_SIZE (SubstLookupSubTable, 2);
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@ -810,8 +655,8 @@ struct SubstLookup : Lookup {
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inline bool is_reverse (void) const {
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switch (get_effective_type ()) {
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case GSUB_ReverseChainingContextSingle: return true;
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default: return false;
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case GSUB_ReverseChainSingle: return true;
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default: return false;
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}
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}
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@ -47,7 +47,7 @@
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property
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/* Context lookups */
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/* Contextual lookups */
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typedef bool (*match_func_t) (hb_codepoint_t glyph_id, const USHORT &value, char *data);
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typedef bool (*apply_lookup_func_t) (LOOKUP_ARGS_DEF, unsigned int lookup_index);
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@ -197,7 +197,6 @@ struct ContextFormat1 {
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friend struct Context;
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private:
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inline bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
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unsigned int index = (this+coverage) (IN_CURGLYPH ());
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@ -231,7 +230,6 @@ struct ContextFormat2 {
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friend struct Context;
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private:
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inline bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
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unsigned int index = (this+coverage) (IN_CURGLYPH ());
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@ -333,6 +331,216 @@ struct Context {
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};
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ASSERT_SIZE (Context, 2);
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/* Chaining Contextual lookups */
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struct ChainSubRule {
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/* TODO */
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private:
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USHORT backtrackGlyphCount; /* Total number of glyphs in the
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* backtrack sequence (number of
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* glyphs to be matched before the
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* first glyph) */
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GlyphID backtrack[]; /* Array of backtracking GlyphID's
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* (to be matched before the input
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* sequence) */
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USHORT inputGlyphCount; /* Total number of glyphs in the input
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* sequence (includes the first glyph) */
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GlyphID input[]; /* Array of input GlyphIDs (start with
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* second glyph) */
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USHORT lookaheadGlyphCount; /* Total number of glyphs in the look
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* ahead sequence (number of glyphs to
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* be matched after the input sequence) */
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GlyphID lookAhead[]; /* Array of lookahead GlyphID's (to be
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* matched after the input sequence) */
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USHORT substCount; /* Number of LookupRecords */
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LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
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* design order) */
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};
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ASSERT_SIZE (ChainSubRule, 8);
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struct ChainSubRuleSet {
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/* TODO */
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private:
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USHORT chainSubRuleCount; /* Number of ChainSubRule tables */
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Offset chainSubRule[]; /* Array of offsets to ChainSubRule
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* tables--from beginning of
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* ChainSubRuleSet table--ordered
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* by preference */
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};
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ASSERT_SIZE (ChainSubRuleSet, 2);
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struct ChainContextFormat1 {
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friend struct ChainContext;
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private:
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inline bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
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/* TODO */
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// unsigned int index = (this+coverage) (IN_CURGLYPH ());
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// const RuleSet &rule_set = this+ruleSet[index];
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// struct ContextLookupContext context = {
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// glyph_match, NULL,
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// apply_func
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// };
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// return rule_set.apply (LOOKUP_ARGS, context);
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}
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private:
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USHORT format; /* Format identifier--format = 1 */
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Offset coverage; /* Offset to Coverage table--from
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* beginning of table */
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USHORT chainSubRuleSetCount; /* Number of ChainSubRuleSet
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* tables--must equal GlyphCount in
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* Coverage table */
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Offset chainSubRuleSet[]; /* Array of offsets to ChainSubRuleSet
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* tables--from beginning of
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* table--ordered by Coverage Index */
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};
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ASSERT_SIZE (ChainContextFormat1, 6);
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struct ChainSubClassRule {
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/* TODO */
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private:
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USHORT backtrackGlyphCount; /* Total number of glyphs in the
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* backtrack sequence (number of
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* glyphs to be matched before the
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* first glyph) */
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USHORT backtrack[]; /* Array of backtracking classes (to be
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* matched before the input sequence) */
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USHORT inputGlyphCount; /* Total number of classes in the input
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* sequence (includes the first class) */
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USHORT input[]; /* Array of input classes(start with
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* second class; to be matched with
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* the input glyph sequence) */
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USHORT lookaheadGlyphCount; /* Total number of classes in the
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* look ahead sequence (number of
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* classes to be matched after the
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* input sequence) */
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USHORT lookAhead[]; /* Array of lookahead classes (to be
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* matched after the input sequence) */
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USHORT substCount; /* Number of LookupRecords */
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LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
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* design order) */
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};
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ASSERT_SIZE (ChainSubClassRule, 8);
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struct ChainSubClassSet {
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/* TODO */
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private:
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USHORT chainSubClassRuleCnt; /* Number of ChainSubClassRule tables */
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Offset chainSubClassRule[]; /* Array of offsets
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* to ChainSubClassRule
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* tables--from beginning of
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* ChainSubClassSet--ordered by
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* preference */
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};
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ASSERT_SIZE (ChainSubClassSet, 2);
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struct ChainContextFormat2 {
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friend struct ChainContext;
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private:
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inline bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
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// unsigned int index = (this+coverage) (IN_CURGLYPH ());
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// const RuleSet &rule_set = this+ruleSet[index];
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/* LONGTERMTODO: Old code fetches glyph classes at most once and caches
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* them across subrule lookups. Not sure it's worth it.
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*/
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// struct ContextLookupContext context = {
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// class_match, (char *) &(this+classDef),
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// apply_func
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// };
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// return rule_set.apply (LOOKUP_ARGS, context);
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}
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private:
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USHORT format; /* Format identifier--format = 2 */
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Offset coverage; /* Offset to Coverage table--from
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* beginning of table */
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Offset backtrackClassDef; /* Offset to glyph ClassDef table
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* containing backtrack sequence
|
||||
* data--from beginning of table */
|
||||
Offset inputClassDef; /* Offset to glyph ClassDef
|
||||
* table containing input sequence
|
||||
* data--from beginning of table */
|
||||
Offset lookaheadClassDef; /* Offset to glyph ClassDef table
|
||||
* containing lookahead sequence
|
||||
* data--from beginning of table */
|
||||
USHORT chainSubClassSetCnt; /* Number of ChainSubClassSet tables */
|
||||
Offset chainSubClassSet[]; /* Array of offsets to ChainSubClassSet
|
||||
* tables--from beginning of
|
||||
* table--ordered by input
|
||||
* class--may be NULL */
|
||||
};
|
||||
ASSERT_SIZE (ChainContextFormat2, 12);
|
||||
|
||||
struct ChainContextFormat3 {
|
||||
|
||||
friend struct ChainContext;
|
||||
|
||||
private:
|
||||
inline bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
|
||||
|
||||
// if ((*this)[0].get_coverage (IN_CURGLYPH () == NOT_COVERED))
|
||||
// return false;
|
||||
|
||||
// return apply_coverage (LOOKUP_ARGS, apply_func);
|
||||
}
|
||||
|
||||
private:
|
||||
USHORT format; /* Format identifier--format = 3 */
|
||||
USHORT backtrackGlyphCount; /* Number of glyphs in the backtracking
|
||||
* sequence */
|
||||
Offset backtrackCoverage[]; /* Array of offsets to coverage tables
|
||||
* in backtracking sequence, in glyph
|
||||
* sequence order */
|
||||
USHORT inputGlyphCount; /* Number of glyphs in input sequence */
|
||||
Offset inputCoverage[]; /* Array of offsets to coverage
|
||||
* tables in input sequence, in glyph
|
||||
* sequence order */
|
||||
USHORT lookaheadGlyphCount; /* Number of glyphs in lookahead
|
||||
* sequence */
|
||||
Offset lookaheadCoverage[]; /* Array of offsets to coverage tables
|
||||
* in lookahead sequence, in glyph
|
||||
* sequence order */
|
||||
USHORT substCount; /* Number of LookupRecords */
|
||||
LookupRecord substLookupRecord[]; /* Array of LookupRecords--in
|
||||
* design order */
|
||||
};
|
||||
ASSERT_SIZE (ChainContextFormat3, 10);
|
||||
|
||||
struct ChainContext {
|
||||
|
||||
protected:
|
||||
bool apply (LOOKUP_ARGS_DEF, apply_lookup_func_t apply_func) const {
|
||||
switch (u.format) {
|
||||
case 1: return u.format1->apply (LOOKUP_ARGS, apply_func);
|
||||
case 2: return u.format2->apply (LOOKUP_ARGS, apply_func);
|
||||
case 3: return u.format3->apply (LOOKUP_ARGS, apply_func);
|
||||
default:return false;
|
||||
}
|
||||
}
|
||||
|
||||
private:
|
||||
union {
|
||||
USHORT format; /* Format identifier */
|
||||
ChainContextFormat1 format1[];
|
||||
ChainContextFormat2 format2[];
|
||||
ChainContextFormat3 format3[];
|
||||
} u;
|
||||
};
|
||||
ASSERT_SIZE (ChainContext, 2);
|
||||
|
||||
|
||||
/*
|
||||
* GSUB/GPOS Common
|
||||
*/
|
||||
|
|
|
|||
Loading…
Reference in New Issue