usp10: Start implementing Chaining Context Substitution Format 3: Coverage-based Chaining Context Glyph Substitution.
This commit is contained in:
Aric Stewart
Alexandre Julliard
parent
0e7a5bf76c
commit
1b37809dba
@ -185,6 +185,42 @@ typedef struct{
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WORD Component[1];
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WORD Component[1];
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}GSUB_Ligature;
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}GSUB_Ligature;
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typedef struct{
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WORD SequenceIndex;
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WORD LookupListIndex;
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}GSUB_SubstLookupRecord;
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typedef struct{
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WORD SubstFormat; /* = 1 */
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WORD Coverage;
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WORD ChainSubRuleSetCount;
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WORD ChainSubRuleSet[1];
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}GSUB_ChainContextSubstFormat1;
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typedef struct {
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WORD SubstFormat; /* = 3 */
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WORD BacktrackGlyphCount;
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WORD Coverage[1];
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}GSUB_ChainContextSubstFormat3_1;
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typedef struct{
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WORD InputGlyphCount;
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WORD Coverage[1];
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}GSUB_ChainContextSubstFormat3_2;
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typedef struct{
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WORD LookaheadGlyphCount;
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WORD Coverage[1];
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}GSUB_ChainContextSubstFormat3_3;
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typedef struct{
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WORD SubstCount;
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GSUB_SubstLookupRecord SubstLookupRecord[1];
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}GSUB_ChainContextSubstFormat3_4;
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static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count);
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/* the orders of joined_forms and contextual_features need to line up */
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/* the orders of joined_forms and contextual_features need to line up */
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static const char* contextual_features[] =
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static const char* contextual_features[] =
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{
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{
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@ -429,6 +465,101 @@ static INT GSUB_apply_LigatureSubst(const GSUB_LookupTable *look, WORD *glyphs,
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return GSUB_E_NOGLYPH;
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return GSUB_E_NOGLYPH;
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}
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}
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static INT GSUB_apply_ChainContextSubst(const GSUB_LookupList* lookup, const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
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{
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int j;
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BOOL done = FALSE;
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TRACE("Chaining Contextual Substitution Subtable\n");
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for (j = 0; j < GET_BE_WORD(look->SubTableCount) && !done; j++)
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{
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const GSUB_ChainContextSubstFormat1 *ccsf1;
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int offset;
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int dirLookahead = write_dir;
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int dirBacktrack = -1 * write_dir;
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offset = GET_BE_WORD(look->SubTable[j]);
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ccsf1 = (const GSUB_ChainContextSubstFormat1*)((const BYTE*)look+offset);
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if (GET_BE_WORD(ccsf1->SubstFormat) == 1)
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{
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FIXME(" TODO: subtype 1 (Simple context glyph substitution)\n");
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return -1;
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}
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else if (GET_BE_WORD(ccsf1->SubstFormat) == 2)
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{
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FIXME(" TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n");
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return -1;
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}
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else if (GET_BE_WORD(ccsf1->SubstFormat) == 3)
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{
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int k;
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int indexGlyphs;
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const GSUB_ChainContextSubstFormat3_1 *ccsf3_1;
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const GSUB_ChainContextSubstFormat3_2 *ccsf3_2;
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const GSUB_ChainContextSubstFormat3_3 *ccsf3_3;
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const GSUB_ChainContextSubstFormat3_4 *ccsf3_4;
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int newIndex = glyph_index;
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ccsf3_1 = (const GSUB_ChainContextSubstFormat3_1 *)ccsf1;
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TRACE(" subtype 3 (Coverage-based Chaining Context Glyph Substitution)\n");
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for (k = 0; k < GET_BE_WORD(ccsf3_1->BacktrackGlyphCount); k++)
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{
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offset = GET_BE_WORD(ccsf3_1->Coverage[k]);
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if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirBacktrack * (k+1))]) == -1)
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break;
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}
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if (k != GET_BE_WORD(ccsf3_1->BacktrackGlyphCount))
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return -1;
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TRACE("Matched Backtrack\n");
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ccsf3_2 = (const GSUB_ChainContextSubstFormat3_2 *)(((LPBYTE)ccsf1)+sizeof(GSUB_ChainContextSubstFormat3_1) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_1->BacktrackGlyphCount)-1)));
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indexGlyphs = GET_BE_WORD(ccsf3_2->InputGlyphCount);
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for (k = 0; k < indexGlyphs; k++)
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{
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offset = GET_BE_WORD(ccsf3_2->Coverage[k]);
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if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (write_dir * k)]) == -1)
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break;
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}
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if (k != indexGlyphs)
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return -1;
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TRACE("Matched IndexGlyphs\n");
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ccsf3_3 = (const GSUB_ChainContextSubstFormat3_3 *)(((LPBYTE)ccsf3_2)+sizeof(GSUB_ChainContextSubstFormat3_2) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_2->InputGlyphCount)-1)));
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for (k = 0; k < GET_BE_WORD(ccsf3_3->LookaheadGlyphCount); k++)
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{
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offset = GET_BE_WORD(ccsf3_3->Coverage[k]);
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if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirLookahead * (indexGlyphs + k+1))]) == -1)
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break;
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}
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if (k != GET_BE_WORD(ccsf3_3->LookaheadGlyphCount))
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return -1;
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TRACE("Matched LookAhead\n");
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ccsf3_4 = (const GSUB_ChainContextSubstFormat3_4 *)(((LPBYTE)ccsf3_3)+sizeof(GSUB_ChainContextSubstFormat3_3) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_3->LookaheadGlyphCount)-1)));
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for (k = 0; k < GET_BE_WORD(ccsf3_4->SubstCount); k++)
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{
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int lookupIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].LookupListIndex);
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int SequenceIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].SequenceIndex) * write_dir;
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TRACE("SUBST: %i -> %i %i\n",k, SequenceIndex, lookupIndex);
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newIndex = GSUB_apply_lookup(lookup, lookupIndex, glyphs, glyph_index + SequenceIndex, write_dir, glyph_count);
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if (newIndex == -1)
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{
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ERR("Chain failed to generate a glyph\n");
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return -1;
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}
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}
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return newIndex + 1;
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}
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}
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return -1;
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}
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static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
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static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
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{
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{
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int offset;
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int offset;
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@ -443,6 +574,8 @@ static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WO
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return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
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return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
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case 4:
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case 4:
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return GSUB_apply_LigatureSubst(look, glyphs, glyph_index, write_dir, glyph_count);
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return GSUB_apply_LigatureSubst(look, glyphs, glyph_index, write_dir, glyph_count);
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case 6:
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return GSUB_apply_ChainContextSubst(lookup, look, glyphs, glyph_index, write_dir, glyph_count);
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default:
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default:
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FIXME("We do not handle SubType %i\n",GET_BE_WORD(look->LookupType));
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FIXME("We do not handle SubType %i\n",GET_BE_WORD(look->LookupType));
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}
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}
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