Aric Stewart : usp10: Implement GSUB Context Substitution types 1 and 2.
Module: wine Branch: master Commit: 5e6b2c0ed6c57fa98d1d6003bf234bebe049a34a URL: http://source.winehq.org/git/wine.git/?a=commit;h=5e6b2c0ed6c57fa98d1d6003bf... Author: Aric Stewart <aric(a)codeweavers.com> Date: Wed Jan 25 07:14:52 2017 -0600 usp10: Implement GSUB Context Substitution types 1 and 2. Used by the font Noto Nastaliq Urdu. Signed-off-by: Aric Stewart <aric(a)codeweavers.com> Signed-off-by: Alexandre Julliard <julliard(a)winehq.org> --- dlls/usp10/opentype.c | 192 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 192 insertions(+) diff --git a/dlls/usp10/opentype.c b/dlls/usp10/opentype.c index d7afbe1..29ec503 100644 --- a/dlls/usp10/opentype.c +++ b/dlls/usp10/opentype.c @@ -238,6 +238,51 @@ typedef struct{ }GSUB_SubstLookupRecord; typedef struct{ + WORD SubstFormat; + WORD Coverage; + WORD SubRuleSetCount; + WORD SubRuleSet[1]; +}GSUB_ContextSubstFormat1; + +typedef struct{ + WORD SubRuleCount; + WORD SubRule[1]; +}GSUB_SubRuleSet; + +typedef struct { + WORD GlyphCount; + WORD SubstCount; + WORD Input[1]; +}GSUB_SubRule_1; + +typedef struct { + GSUB_SubstLookupRecord SubstLookupRecord[1]; +}GSUB_SubRule_2; + +typedef struct { + WORD SubstFormat; + WORD Coverage; + WORD ClassDef; + WORD SubClassSetCnt; + WORD SubClassSet[1]; +}GSUB_ContextSubstFormat2; + +typedef struct { + WORD SubClassRuleCnt; + WORD SubClassRule[1]; +}GSUB_SubClassSet; + +typedef struct { + WORD GlyphCount; + WORD SubstCount; + WORD Class[1]; +}GSUB_SubClassRule_1; + +typedef struct { + GSUB_SubstLookupRecord SubstLookupRecord[1]; +}GSUB_SubClassRule_2; + +typedef struct{ WORD SubstFormat; /* = 1 */ WORD Coverage; WORD ChainSubRuleSetCount; @@ -940,6 +985,151 @@ static INT GSUB_apply_LigatureSubst(const OT_LookupTable *look, WORD *glyphs, IN return GSUB_E_NOGLYPH; } +static INT GSUB_apply_ContextSubst(const OT_LookupList* lookup, const OT_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count) +{ + int j; + TRACE("Context Substitution Subtable\n"); + for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++) + { + const GSUB_ContextSubstFormat1 *csf1; + + csf1 = (const GSUB_ContextSubstFormat1*)GSUB_get_subtable(look, j); + if (GET_BE_WORD(csf1->SubstFormat) == 1) + { + int offset, index; + TRACE("Context Substitution Subtable: Class 1\n"); + offset = GET_BE_WORD(csf1->Coverage); + index = GSUB_is_glyph_covered((const BYTE*)csf1+offset, glyphs[glyph_index]); + TRACE(" Coverage index %i\n",index); + if (index != -1) + { + int k, count; + const GSUB_SubRuleSet *srs; + offset = GET_BE_WORD(csf1->SubRuleSet[index]); + srs = (const GSUB_SubRuleSet*)((const BYTE*)csf1+offset); + count = GET_BE_WORD(srs->SubRuleCount); + TRACE(" SubRuleSet has %i members\n",count); + for (k = 0; k < count; k++) + { + const GSUB_SubRule_1 *sr; + const GSUB_SubRule_2 *sr_2; + int g_count, l; + int newIndex = glyph_index; + + offset = GET_BE_WORD(srs->SubRule[k]); + sr = (const GSUB_SubRule_1*)((const BYTE*)srs+offset); + g_count = GET_BE_WORD(sr->GlyphCount); + TRACE(" SubRule has %i glyphs\n",g_count); + for (l = 0; l < g_count-1; l++) + if (glyphs[glyph_index + (write_dir * (l+1))] != GET_BE_WORD(sr->Input[l])) break; + + if (l < g_count-1) + { + TRACE(" Rule does not match\n"); + continue; + } + + TRACE(" Rule matches\n"); + sr_2 = (const GSUB_SubRule_2*)((const BYTE*)sr+ + FIELD_OFFSET(GSUB_SubRule_1, Input[g_count-1])); + + for (l = 0; l < GET_BE_WORD(sr->SubstCount); l++) + { + int lookupIndex = GET_BE_WORD(sr_2->SubstLookupRecord[l].LookupListIndex); + int SequenceIndex = GET_BE_WORD(sr_2->SubstLookupRecord[l].SequenceIndex) * write_dir; + + TRACE(" SUBST: %i -> %i %i\n",l, SequenceIndex, lookupIndex); + newIndex = GSUB_apply_lookup(lookup, lookupIndex, glyphs, glyph_index + SequenceIndex, write_dir, glyph_count); + if (newIndex == -1) + { + ERR(" Chain failed to generate a glyph\n"); + continue; + } + } + return newIndex; + } + } + } + else if (GET_BE_WORD(csf1->SubstFormat) == 2) + { + const GSUB_ContextSubstFormat2 *csf2; + const void *glyph_class_table; + int offset, index; + + csf2 = (const GSUB_ContextSubstFormat2*)csf1; + TRACE("Context Substitution Subtable: Class 2\n"); + offset = GET_BE_WORD(csf2->Coverage); + index = GSUB_is_glyph_covered((const BYTE*)csf2+offset, glyphs[glyph_index]); + TRACE(" Coverage index %i\n",index); + if (index != -1) + { + int k, count, class; + const GSUB_SubClassSet *scs; + + offset = GET_BE_WORD(csf2->ClassDef); + glyph_class_table = (const BYTE *)csf2 + offset; + + class = OT_get_glyph_class(glyph_class_table,glyphs[glyph_index]); + + offset = GET_BE_WORD(csf2->SubClassSet[class]); + if (offset == 0) + { + TRACE(" No class rule table for class %i\n",class); + continue; + } + scs = (const GSUB_SubClassSet*)((const BYTE*)csf2+offset); + count = GET_BE_WORD(scs->SubClassRuleCnt); + TRACE(" SubClassSet has %i members\n",count); + for (k = 0; k < count; k++) + { + const GSUB_SubClassRule_1 *sr; + const GSUB_SubClassRule_2 *sr_2; + int g_count, l; + int newIndex = glyph_index; + + offset = GET_BE_WORD(scs->SubClassRule[k]); + sr = (const GSUB_SubClassRule_1*)((const BYTE*)scs+offset); + g_count = GET_BE_WORD(sr->GlyphCount); + TRACE(" SubClassRule has %i glyphs classes\n",g_count); + for (l = 0; l < g_count-1; l++) + { + int g_class = OT_get_glyph_class(glyph_class_table, glyphs[glyph_index + (write_dir * (l+1))]); + if (g_class != GET_BE_WORD(sr->Class[l])) break; + } + + if (l < g_count-1) + { + TRACE(" Rule does not match\n"); + continue; + } + + TRACE(" Rule matches\n"); + sr_2 = (const GSUB_SubClassRule_2*)((const BYTE*)sr+ + FIELD_OFFSET(GSUB_SubClassRule_1, Class[g_count-1])); + + for (l = 0; l < GET_BE_WORD(sr->SubstCount); l++) + { + int lookupIndex = GET_BE_WORD(sr_2->SubstLookupRecord[l].LookupListIndex); + int SequenceIndex = GET_BE_WORD(sr_2->SubstLookupRecord[l].SequenceIndex) * write_dir; + + TRACE(" SUBST: %i -> %i %i\n",l, SequenceIndex, lookupIndex); + newIndex = GSUB_apply_lookup(lookup, lookupIndex, glyphs, glyph_index + SequenceIndex, write_dir, glyph_count); + if (newIndex == -1) + { + ERR(" Chain failed to generate a glyph\n"); + continue; + } + } + return newIndex; + } + } + } + else + FIXME("Unhandled Context Substitution Format %i\n", GET_BE_WORD(csf1->SubstFormat)); + } + return GSUB_E_NOGLYPH; +} + static INT GSUB_apply_ChainContextSubst(const OT_LookupList* lookup, const OT_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count) { int j; @@ -1084,6 +1274,8 @@ static INT GSUB_apply_lookup(const OT_LookupList* lookup, INT lookup_index, WORD return GSUB_apply_AlternateSubst(look, glyphs, glyph_index, write_dir, glyph_count); case 4: return GSUB_apply_LigatureSubst(look, glyphs, glyph_index, write_dir, glyph_count); + case 5: + return GSUB_apply_ContextSubst(lookup, look, glyphs, glyph_index, write_dir, glyph_count); case 6: return GSUB_apply_ChainContextSubst(lookup, look, glyphs, glyph_index, write_dir, glyph_count); case 7:
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Alexandre Julliard