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usp10: Add beginning support for GSUB Alternate Substitution Subtable.

This commit is contained in:
Aric Stewart 2010-08-03 11:16:49 -05:00 committed by Alexandre Julliard
parent 76dd207733
commit d4befda3c7
1 changed files with 46 additions and 0 deletions
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46
dlls/usp10/shape.c
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@ -219,6 +219,18 @@ typedef struct{
GSUB_SubstLookupRecord SubstLookupRecord[1];
}GSUB_ChainContextSubstFormat3_4;
typedef struct {
WORD SubstFormat; /* = 1 */
WORD Coverage;
WORD AlternateSetCount;
WORD AlternateSet[1];
} GSUB_AlternateSubstFormat1;
typedef struct{
WORD GlyphCount;
WORD Alternate[1];
} GSUB_AlternateSet;
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 */
@ -400,6 +412,38 @@ static INT GSUB_apply_SingleSubst(const GSUB_LookupTable *look, WORD *glyphs, IN
return GSUB_E_NOGLYPH;
}
static INT GSUB_apply_AlternateSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int j;
TRACE("Alternate Substitution Subtable\n");
for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
{
int offset;
const GSUB_AlternateSubstFormat1 *asf1;
INT index;
offset = GET_BE_WORD(look->SubTable[j]);
asf1 = (const GSUB_AlternateSubstFormat1*)((const BYTE*)look+offset);
offset = GET_BE_WORD(asf1->Coverage);
index = GSUB_is_glyph_covered((const BYTE*)asf1+offset, glyphs[glyph_index]);
if (index != -1)
{
const GSUB_AlternateSet *as;
offset = GET_BE_WORD(asf1->AlternateSet[index]);
as = (const GSUB_AlternateSet*)((const BYTE*)asf1+offset);
FIXME("%i alternates, picking index 0\n",GET_BE_WORD(as->GlyphCount));
TRACE(" Glyph 0x%x ->",glyphs[glyph_index]);
glyphs[glyph_index] = GET_BE_WORD(as->Alternate[0]);
TRACE(" 0x%x\n",glyphs[glyph_index]);
return glyph_index + 1;
}
}
return GSUB_E_NOGLYPH;
}
static INT GSUB_apply_LigatureSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int j;
@ -572,6 +616,8 @@ static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WO
{
case 1:
return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
case 3:
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 6: