Aric Stewart : usp10: Start implementing Chaining Context Substitution Format 3: Coverage-based Chaining Context Glyph Substitution.
Module: wine Branch: master Commit: 1b37809dba65745828d7895ad5fda9bc3fd1e403 URL: http://source.winehq.org/git/wine.git/?a=commit;h=1b37809dba65745828d7895ad5...
Author: Aric Stewart aric@codeweavers.com Date: Thu Jul 22 16:18:02 2010 -0500
usp10: Start implementing Chaining Context Substitution Format 3: Coverage-based Chaining Context Glyph Substitution.
---
dlls/usp10/shape.c | 133 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 133 insertions(+), 0 deletions(-)
diff --git a/dlls/usp10/shape.c b/dlls/usp10/shape.c index 0a4f5b9..0018ae5 100644 --- a/dlls/usp10/shape.c +++ b/dlls/usp10/shape.c @@ -185,6 +185,42 @@ typedef struct{ WORD Component[1]; }GSUB_Ligature;
+typedef struct{ + WORD SequenceIndex; + WORD LookupListIndex; + +}GSUB_SubstLookupRecord; + +typedef struct{ + WORD SubstFormat; /* = 1 */ + WORD Coverage; + WORD ChainSubRuleSetCount; + WORD ChainSubRuleSet[1]; +}GSUB_ChainContextSubstFormat1; + +typedef struct { + WORD SubstFormat; /* = 3 */ + WORD BacktrackGlyphCount; + WORD Coverage[1]; +}GSUB_ChainContextSubstFormat3_1; + +typedef struct{ + WORD InputGlyphCount; + WORD Coverage[1]; +}GSUB_ChainContextSubstFormat3_2; + +typedef struct{ + WORD LookaheadGlyphCount; + WORD Coverage[1]; +}GSUB_ChainContextSubstFormat3_3; + +typedef struct{ + WORD SubstCount; + GSUB_SubstLookupRecord SubstLookupRecord[1]; +}GSUB_ChainContextSubstFormat3_4; + +static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count); + /* the orders of joined_forms and contextual_features need to line up */ static const char* contextual_features[] = { @@ -429,6 +465,101 @@ static INT GSUB_apply_LigatureSubst(const GSUB_LookupTable *look, WORD *glyphs, return GSUB_E_NOGLYPH; }
+static INT GSUB_apply_ChainContextSubst(const GSUB_LookupList* lookup, const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count) +{ + int j; + BOOL done = FALSE; + + TRACE("Chaining Contextual Substitution Subtable\n"); + for (j = 0; j < GET_BE_WORD(look->SubTableCount) && !done; j++) + { + const GSUB_ChainContextSubstFormat1 *ccsf1; + int offset; + int dirLookahead = write_dir; + int dirBacktrack = -1 * write_dir; + + offset = GET_BE_WORD(look->SubTable[j]); + ccsf1 = (const GSUB_ChainContextSubstFormat1*)((const BYTE*)look+offset); + if (GET_BE_WORD(ccsf1->SubstFormat) == 1) + { + FIXME(" TODO: subtype 1 (Simple context glyph substitution)\n"); + return -1; + } + else if (GET_BE_WORD(ccsf1->SubstFormat) == 2) + { + FIXME(" TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n"); + return -1; + } + else if (GET_BE_WORD(ccsf1->SubstFormat) == 3) + { + int k; + int indexGlyphs; + const GSUB_ChainContextSubstFormat3_1 *ccsf3_1; + const GSUB_ChainContextSubstFormat3_2 *ccsf3_2; + const GSUB_ChainContextSubstFormat3_3 *ccsf3_3; + const GSUB_ChainContextSubstFormat3_4 *ccsf3_4; + int newIndex = glyph_index; + + ccsf3_1 = (const GSUB_ChainContextSubstFormat3_1 *)ccsf1; + + TRACE(" subtype 3 (Coverage-based Chaining Context Glyph Substitution)\n"); + + for (k = 0; k < GET_BE_WORD(ccsf3_1->BacktrackGlyphCount); k++) + { + offset = GET_BE_WORD(ccsf3_1->Coverage[k]); + if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirBacktrack * (k+1))]) == -1) + break; + } + if (k != GET_BE_WORD(ccsf3_1->BacktrackGlyphCount)) + return -1; + TRACE("Matched Backtrack\n"); + + ccsf3_2 = (const GSUB_ChainContextSubstFormat3_2 *)(((LPBYTE)ccsf1)+sizeof(GSUB_ChainContextSubstFormat3_1) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_1->BacktrackGlyphCount)-1))); + + indexGlyphs = GET_BE_WORD(ccsf3_2->InputGlyphCount); + for (k = 0; k < indexGlyphs; k++) + { + offset = GET_BE_WORD(ccsf3_2->Coverage[k]); + if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (write_dir * k)]) == -1) + break; + } + if (k != indexGlyphs) + return -1; + TRACE("Matched IndexGlyphs\n"); + + ccsf3_3 = (const GSUB_ChainContextSubstFormat3_3 *)(((LPBYTE)ccsf3_2)+sizeof(GSUB_ChainContextSubstFormat3_2) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_2->InputGlyphCount)-1))); + + for (k = 0; k < GET_BE_WORD(ccsf3_3->LookaheadGlyphCount); k++) + { + offset = GET_BE_WORD(ccsf3_3->Coverage[k]); + if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirLookahead * (indexGlyphs + k+1))]) == -1) + break; + } + if (k != GET_BE_WORD(ccsf3_3->LookaheadGlyphCount)) + return -1; + TRACE("Matched LookAhead\n"); + + ccsf3_4 = (const GSUB_ChainContextSubstFormat3_4 *)(((LPBYTE)ccsf3_3)+sizeof(GSUB_ChainContextSubstFormat3_3) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_3->LookaheadGlyphCount)-1))); + + for (k = 0; k < GET_BE_WORD(ccsf3_4->SubstCount); k++) + { + int lookupIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].LookupListIndex); + int SequenceIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].SequenceIndex) * write_dir; + + TRACE("SUBST: %i -> %i %i\n",k, 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"); + return -1; + } + } + return newIndex + 1; + } + } + return -1; +} + static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count) { int offset; @@ -443,6 +574,8 @@ static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WO return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count); case 4: return GSUB_apply_LigatureSubst(look, glyphs, glyph_index, write_dir, glyph_count); + case 6: + return GSUB_apply_ChainContextSubst(lookup, look, glyphs, glyph_index, write_dir, glyph_count); default: FIXME("We do not handle SubType %i\n",GET_BE_WORD(look->LookupType)); }
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Alexandre Julliard