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/*
* Opentype font interfaces for the Uniscribe Script Processor (usp10.dll)
*
* Copyright 2012 CodeWeavers, Aric Stewart
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
*/
#include <stdarg.h>
#include <stdlib.h>
#include "windef.h"
#include "winbase.h"
#include "wingdi.h"
#include "winuser.h"
#include "winnls.h"
#include "usp10.h"
#include "winternl.h"
#include "usp10_internal.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(uniscribe);
#ifdef WORDS_BIGENDIAN
#define GET_BE_WORD(x) (x)
#define GET_BE_DWORD(x) (x)
#else
#define GET_BE_WORD(x) RtlUshortByteSwap(x)
#define GET_BE_DWORD(x) RtlUlongByteSwap(x)
#endif
/* These are all structures needed for the cmap format 12 table */
#define CMAP_TAG MS_MAKE_TAG('c', 'm', 'a', 'p')
typedef struct {
WORD platformID;
WORD encodingID;
DWORD offset;
} CMAP_EncodingRecord;
typedef struct {
WORD version;
WORD numTables;
CMAP_EncodingRecord tables[1];
} CMAP_Header;
typedef struct {
DWORD startCharCode;
DWORD endCharCode;
DWORD startGlyphID;
} CMAP_SegmentedCoverage_group;
typedef struct {
WORD format;
WORD reserved;
DWORD length;
DWORD language;
DWORD nGroups;
CMAP_SegmentedCoverage_group groups[1];
} CMAP_SegmentedCoverage;
/* These are all structures needed for the GDEF table */
#define GDEF_TAG MS_MAKE_TAG('G', 'D', 'E', 'F')
enum {BaseGlyph=1, LigatureGlyph, MarkGlyph, ComponentGlyph};
typedef struct {
DWORD Version;
WORD GlyphClassDef;
WORD AttachList;
WORD LigCaretList;
WORD MarkAttachClassDef;
} GDEF_Header;
typedef struct {
WORD ClassFormat;
WORD StartGlyph;
WORD GlyphCount;
WORD ClassValueArray[1];
} GDEF_ClassDefFormat1;
typedef struct {
WORD Start;
WORD End;
WORD Class;
} GDEF_ClassRangeRecord;
typedef struct {
WORD ClassFormat;
WORD ClassRangeCount;
GDEF_ClassRangeRecord ClassRangeRecord[1];
} GDEF_ClassDefFormat2;
/* These are all structures needed for the GSUB table */
typedef struct {
DWORD version;
WORD ScriptList;
WORD FeatureList;
WORD LookupList;
} GSUB_Header;
typedef struct {
CHAR ScriptTag[4];
WORD Script;
} OT_ScriptRecord;
typedef struct {
WORD ScriptCount;
OT_ScriptRecord ScriptRecord[1];
} OT_ScriptList;
typedef struct {
CHAR LangSysTag[4];
WORD LangSys;
} OT_LangSysRecord;
typedef struct {
WORD DefaultLangSys;
WORD LangSysCount;
OT_LangSysRecord LangSysRecord[1];
} OT_Script;
typedef struct {
WORD LookupOrder; /* Reserved */
WORD ReqFeatureIndex;
WORD FeatureCount;
WORD FeatureIndex[1];
} OT_LangSys;
typedef struct {
CHAR FeatureTag[4];
WORD Feature;
} OT_FeatureRecord;
typedef struct {
WORD FeatureCount;
OT_FeatureRecord FeatureRecord[1];
} OT_FeatureList;
typedef struct {
WORD FeatureParams; /* Reserved */
WORD LookupCount;
WORD LookupListIndex[1];
} OT_Feature;
typedef struct {
WORD LookupCount;
WORD Lookup[1];
} OT_LookupList;
typedef struct {
WORD LookupType;
WORD LookupFlag;
WORD SubTableCount;
WORD SubTable[1];
} OT_LookupTable;
typedef struct {
WORD CoverageFormat;
WORD GlyphCount;
WORD GlyphArray[1];
} OT_CoverageFormat1;
typedef struct {
WORD Start;
WORD End;
WORD StartCoverageIndex;
} OT_RangeRecord;
typedef struct {
WORD CoverageFormat;
WORD RangeCount;
OT_RangeRecord RangeRecord[1];
} OT_CoverageFormat2;
typedef struct {
WORD SubstFormat; /* = 1 */
WORD Coverage;
WORD DeltaGlyphID;
} GSUB_SingleSubstFormat1;
typedef struct {
WORD SubstFormat; /* = 2 */
WORD Coverage;
WORD GlyphCount;
WORD Substitute[1];
}GSUB_SingleSubstFormat2;
typedef struct {
WORD SubstFormat; /* = 1 */
WORD Coverage;
WORD SequenceCount;
WORD Sequence[1];
}GSUB_MultipleSubstFormat1;
typedef struct {
WORD GlyphCount;
WORD Substitute[1];
}GSUB_Sequence;
typedef struct {
WORD SubstFormat; /* = 1 */
WORD Coverage;
WORD LigSetCount;
WORD LigatureSet[1];
}GSUB_LigatureSubstFormat1;
typedef struct {
WORD LigatureCount;
WORD Ligature[1];
}GSUB_LigatureSet;
typedef struct{
WORD LigGlyph;
WORD CompCount;
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;
typedef struct {
WORD SubstFormat; /* = 1 */
WORD Coverage;
WORD AlternateSetCount;
WORD AlternateSet[1];
} GSUB_AlternateSubstFormat1;
typedef struct{
WORD GlyphCount;
WORD Alternate[1];
} GSUB_AlternateSet;
/* These are all structures needed for the GPOS table */
typedef struct {
DWORD version;
WORD ScriptList;
WORD FeatureList;
WORD LookupList;
} GPOS_Header;
typedef struct {
WORD StartSize;
WORD EndSize;
WORD DeltaFormat;
WORD DeltaValue[1];
} OT_DeviceTable;
typedef struct {
WORD AnchorFormat;
WORD XCoordinate;
WORD YCoordinate;
} GPOS_AnchorFormat1;
typedef struct {
WORD AnchorFormat;
WORD XCoordinate;
WORD YCoordinate;
WORD AnchorPoint;
} GPOS_AnchorFormat2;
typedef struct {
WORD AnchorFormat;
WORD XCoordinate;
WORD YCoordinate;
WORD XDeviceTable;
WORD YDeviceTable;
} GPOS_AnchorFormat3;
/**********
* CMAP
**********/
static VOID *load_CMAP_format12_table(HDC hdc, ScriptCache *psc)
{
CMAP_Header *CMAP_Table = NULL;
int length;
int i;
if (!psc->CMAP_Table)
{
length = GetFontData(hdc, CMAP_TAG , 0, NULL, 0);
if (length != GDI_ERROR)
{
psc->CMAP_Table = HeapAlloc(GetProcessHeap(),0,length);
GetFontData(hdc, CMAP_TAG , 0, psc->CMAP_Table, length);
TRACE("Loaded cmap table of %i bytes\n",length);
}
else
return NULL;
}
CMAP_Table = psc->CMAP_Table;
for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables); i++)
{
if ( (GET_BE_WORD(CMAP_Table->tables[i].platformID) == 3) &&
(GET_BE_WORD(CMAP_Table->tables[i].encodingID) == 10) )
{
CMAP_SegmentedCoverage *format = (CMAP_SegmentedCoverage*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
if (GET_BE_WORD(format->format) == 12)
return format;
}
}
return NULL;
}
static int compare_group(const void *a, const void* b)
{
const DWORD *chr = a;
const CMAP_SegmentedCoverage_group *group = b;
if (*chr < GET_BE_DWORD(group->startCharCode))
return -1;
if (*chr > GET_BE_DWORD(group->endCharCode))
return 1;
return 0;
}
DWORD OpenType_CMAP_GetGlyphIndex(HDC hdc, ScriptCache *psc, DWORD utf32c, LPWORD pgi, DWORD flags)
{
/* BMP: use gdi32 for ease */
if (utf32c < 0x10000)
{
WCHAR ch = utf32c;
return GetGlyphIndicesW(hdc,&ch, 1, pgi, flags);
}
if (!psc->CMAP_format12_Table)
psc->CMAP_format12_Table = load_CMAP_format12_table(hdc, psc);
if (flags & GGI_MARK_NONEXISTING_GLYPHS)
*pgi = 0xffff;
else
*pgi = 0;
if (psc->CMAP_format12_Table)
{
CMAP_SegmentedCoverage *format = NULL;
CMAP_SegmentedCoverage_group *group = NULL;
format = (CMAP_SegmentedCoverage *)psc->CMAP_format12_Table;
group = bsearch(&utf32c, format->groups, GET_BE_DWORD(format->nGroups),
sizeof(CMAP_SegmentedCoverage_group), compare_group);
if (group)
{
DWORD offset = utf32c - GET_BE_DWORD(group->startCharCode);
*pgi = GET_BE_DWORD(group->startGlyphID) + offset;
return 0;
}
}
return 0;
}
/**********
* GDEF
**********/
static WORD GDEF_get_glyph_class(const GDEF_Header *header, WORD glyph)
{
int offset;
WORD class = 0;
const GDEF_ClassDefFormat1 *cf1;
if (!header)
return 0;
offset = GET_BE_WORD(header->GlyphClassDef);
if (!offset)
return 0;
cf1 = (GDEF_ClassDefFormat1*)(((BYTE*)header)+offset);
if (GET_BE_WORD(cf1->ClassFormat) == 1)
{
if (glyph >= GET_BE_WORD(cf1->StartGlyph))
{
int index = glyph - GET_BE_WORD(cf1->StartGlyph);
if (index < GET_BE_WORD(cf1->GlyphCount))
class = GET_BE_WORD(cf1->ClassValueArray[index]);
}
}
else if (GET_BE_WORD(cf1->ClassFormat) == 2)
{
const GDEF_ClassDefFormat2 *cf2 = (GDEF_ClassDefFormat2*)cf1;
int i, top;
top = GET_BE_WORD(cf2->ClassRangeCount);
for (i = 0; i < top; i++)
{
if (glyph >= GET_BE_WORD(cf2->ClassRangeRecord[i].Start) &&
glyph <= GET_BE_WORD(cf2->ClassRangeRecord[i].End))
{
class = GET_BE_WORD(cf2->ClassRangeRecord[i].Class);
break;
}
}
}
else
ERR("Unknown Class Format %i\n",GET_BE_WORD(cf1->ClassFormat));
return class;
}
static VOID *load_gdef_table(HDC hdc)
{
VOID* GDEF_Table = NULL;
int length = GetFontData(hdc, GDEF_TAG , 0, NULL, 0);
if (length != GDI_ERROR)
{
GDEF_Table = HeapAlloc(GetProcessHeap(),0,length);
GetFontData(hdc, GDEF_TAG , 0, GDEF_Table, length);
TRACE("Loaded GDEF table of %i bytes\n",length);
}
return GDEF_Table;
}
void OpenType_GDEF_UpdateGlyphProps(HDC hdc, ScriptCache *psc, const WORD *pwGlyphs, const WORD cGlyphs, WORD* pwLogClust, const WORD cChars, SCRIPT_GLYPHPROP *pGlyphProp)
{
int i;
if (!psc->GDEF_Table)
psc->GDEF_Table = load_gdef_table(hdc);
for (i = 0; i < cGlyphs; i++)
{
WORD class;
int char_count = 0;
int k;
k = USP10_FindGlyphInLogClust(pwLogClust, cChars, i);
if (k >= 0)
{
for (; k < cChars && pwLogClust[k] == i; k++)
char_count++;
}
class = GDEF_get_glyph_class(psc->GDEF_Table, pwGlyphs[i]);
switch (class)
{
case 0:
case BaseGlyph:
pGlyphProp[i].sva.fClusterStart = 1;
pGlyphProp[i].sva.fDiacritic = 0;
pGlyphProp[i].sva.fZeroWidth = 0;
break;
case LigatureGlyph:
pGlyphProp[i].sva.fClusterStart = 1;
pGlyphProp[i].sva.fDiacritic = 0;
pGlyphProp[i].sva.fZeroWidth = 0;
break;
case MarkGlyph:
pGlyphProp[i].sva.fClusterStart = 0;
pGlyphProp[i].sva.fDiacritic = 1;
pGlyphProp[i].sva.fZeroWidth = 1;
break;
case ComponentGlyph:
pGlyphProp[i].sva.fClusterStart = 0;
pGlyphProp[i].sva.fDiacritic = 0;
pGlyphProp[i].sva.fZeroWidth = 0;
break;
default:
ERR("Unknown glyph class %i\n",class);
pGlyphProp[i].sva.fClusterStart = 1;
pGlyphProp[i].sva.fDiacritic = 0;
pGlyphProp[i].sva.fZeroWidth = 0;
}
if (char_count == 0)
pGlyphProp[i].sva.fClusterStart = 0;
}
}
/**********
* GSUB
**********/
static INT GSUB_apply_lookup(const OT_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count);
static INT GSUB_is_glyph_covered(LPCVOID table , UINT glyph)
{
const OT_CoverageFormat1* cf1;
cf1 = table;
if (GET_BE_WORD(cf1->CoverageFormat) == 1)
{
int count = GET_BE_WORD(cf1->GlyphCount);
int i;
TRACE("Coverage Format 1, %i glyphs\n",count);
for (i = 0; i < count; i++)
if (glyph == GET_BE_WORD(cf1->GlyphArray[i]))
return i;
return -1;
}
else if (GET_BE_WORD(cf1->CoverageFormat) == 2)
{
const OT_CoverageFormat2* cf2;
int i;
int count;
cf2 = (const OT_CoverageFormat2*)cf1;
count = GET_BE_WORD(cf2->RangeCount);
TRACE("Coverage Format 2, %i ranges\n",count);
for (i = 0; i < count; i++)
{
if (glyph < GET_BE_WORD(cf2->RangeRecord[i].Start))
return -1;
if ((glyph >= GET_BE_WORD(cf2->RangeRecord[i].Start)) &&
(glyph <= GET_BE_WORD(cf2->RangeRecord[i].End)))
{
return (GET_BE_WORD(cf2->RangeRecord[i].StartCoverageIndex) +
glyph - GET_BE_WORD(cf2->RangeRecord[i].Start));
}
}
return -1;
}
else
ERR("Unknown CoverageFormat %i\n",GET_BE_WORD(cf1->CoverageFormat));
return -1;
}
static INT GSUB_apply_SingleSubst(const OT_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int j;
TRACE("Single Substitution Subtable\n");
for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
{
int offset;
const GSUB_SingleSubstFormat1 *ssf1;
offset = GET_BE_WORD(look->SubTable[j]);
ssf1 = (const GSUB_SingleSubstFormat1*)((const BYTE*)look+offset);
if (GET_BE_WORD(ssf1->SubstFormat) == 1)
{
int offset = GET_BE_WORD(ssf1->Coverage);
TRACE(" subtype 1, delta %i\n", GET_BE_WORD(ssf1->DeltaGlyphID));
if (GSUB_is_glyph_covered((const BYTE*)ssf1+offset, glyphs[glyph_index]) != -1)
{
TRACE(" Glyph 0x%x ->",glyphs[glyph_index]);
glyphs[glyph_index] = glyphs[glyph_index] + GET_BE_WORD(ssf1->DeltaGlyphID);
TRACE(" 0x%x\n",glyphs[glyph_index]);
return glyph_index + write_dir;
}
}
else
{
const GSUB_SingleSubstFormat2 *ssf2;
INT index;
INT offset;
ssf2 = (const GSUB_SingleSubstFormat2 *)ssf1;
offset = GET_BE_WORD(ssf1->Coverage);
TRACE(" subtype 2, glyph count %i\n", GET_BE_WORD(ssf2->GlyphCount));
index = GSUB_is_glyph_covered((const BYTE*)ssf2+offset, glyphs[glyph_index]);
TRACE(" Coverage index %i\n",index);
if (index != -1)
{
if (glyphs[glyph_index] == GET_BE_WORD(ssf2->Substitute[index]))
return GSUB_E_NOGLYPH;
TRACE(" Glyph is 0x%x ->",glyphs[glyph_index]);
glyphs[glyph_index] = GET_BE_WORD(ssf2->Substitute[index]);
TRACE("0x%x\n",glyphs[glyph_index]);
return glyph_index + write_dir;
}
}
}
return GSUB_E_NOGLYPH;
}
static INT GSUB_apply_MultipleSubst(const OT_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int j;
TRACE("Multiple Substitution Subtable\n");
for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
{
int offset, index;
const GSUB_MultipleSubstFormat1 *msf1;
offset = GET_BE_WORD(look->SubTable[j]);
msf1 = (const GSUB_MultipleSubstFormat1*)((const BYTE*)look+offset);
offset = GET_BE_WORD(msf1->Coverage);
index = GSUB_is_glyph_covered((const BYTE*)msf1+offset, glyphs[glyph_index]);
if (index != -1)
{
const GSUB_Sequence *seq;
int sub_count;
int j;
offset = GET_BE_WORD(msf1->Sequence[index]);
seq = (const GSUB_Sequence*)((const BYTE*)msf1+offset);
sub_count = GET_BE_WORD(seq->GlyphCount);
TRACE(" Glyph 0x%x (+%i)->",glyphs[glyph_index],(sub_count-1));
for (j = (*glyph_count)+(sub_count-1); j > glyph_index; j--)
glyphs[j] =glyphs[j-(sub_count-1)];
for (j = 0; j < sub_count; j++)
if (write_dir < 0)
glyphs[glyph_index + (sub_count-1) - j] = GET_BE_WORD(seq->Substitute[j]);
else
glyphs[glyph_index + j] = GET_BE_WORD(seq->Substitute[j]);
*glyph_count = *glyph_count + (sub_count - 1);
if (TRACE_ON(uniscribe))
{
for (j = 0; j < sub_count; j++)
TRACE(" 0x%x",glyphs[glyph_index+j]);
TRACE("\n");
}
return glyph_index + (sub_count * write_dir);
}
}
return GSUB_E_NOGLYPH;
}
static INT GSUB_apply_AlternateSubst(const OT_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));
if (glyphs[glyph_index] == GET_BE_WORD(as->Alternate[0]))
return GSUB_E_NOGLYPH;
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 + write_dir;
}
}
return GSUB_E_NOGLYPH;
}
static INT GSUB_apply_LigatureSubst(const OT_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int j;
TRACE("Ligature Substitution Subtable\n");
for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
{
const GSUB_LigatureSubstFormat1 *lsf1;
int offset,index;
offset = GET_BE_WORD(look->SubTable[j]);
lsf1 = (const GSUB_LigatureSubstFormat1*)((const BYTE*)look+offset);
offset = GET_BE_WORD(lsf1->Coverage);
index = GSUB_is_glyph_covered((const BYTE*)lsf1+offset, glyphs[glyph_index]);
TRACE(" Coverage index %i\n",index);
if (index != -1)
{
const GSUB_LigatureSet *ls;
int k, count;
offset = GET_BE_WORD(lsf1->LigatureSet[index]);
ls = (const GSUB_LigatureSet*)((const BYTE*)lsf1+offset);
count = GET_BE_WORD(ls->LigatureCount);
TRACE(" LigatureSet has %i members\n",count);
for (k = 0; k < count; k++)
{
const GSUB_Ligature *lig;
int CompCount,l,CompIndex;
offset = GET_BE_WORD(ls->Ligature[k]);
lig = (const GSUB_Ligature*)((const BYTE*)ls+offset);
CompCount = GET_BE_WORD(lig->CompCount) - 1;
CompIndex = glyph_index+write_dir;
for (l = 0; l < CompCount && CompIndex >= 0 && CompIndex < *glyph_count; l++)
{
int CompGlyph;
CompGlyph = GET_BE_WORD(lig->Component[l]);
if (CompGlyph != glyphs[CompIndex])
break;
CompIndex += write_dir;
}
if (l == CompCount)
{
int replaceIdx = glyph_index;
if (write_dir < 0)
replaceIdx = glyph_index - CompCount;
TRACE(" Glyph is 0x%x (+%i) ->",glyphs[glyph_index],CompCount);
glyphs[replaceIdx] = GET_BE_WORD(lig->LigGlyph);
TRACE("0x%x\n",glyphs[replaceIdx]);
if (CompCount > 0)
{
int j;
for (j = replaceIdx + 1; j < *glyph_count; j++)
glyphs[j] =glyphs[j+CompCount];
*glyph_count = *glyph_count - CompCount;
}
return replaceIdx + write_dir;
}
}
}
}
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;
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");
continue;
}
else if (GET_BE_WORD(ccsf1->SubstFormat) == 2)
{
FIXME(" TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n");
continue;
}
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))
continue;
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)
continue;
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)
break;
}
if (k != GET_BE_WORD(ccsf3_3->LookaheadGlyphCount))
continue;
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)));
if (GET_BE_WORD(ccsf3_4->SubstCount))
{
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");
continue;
}
}
return newIndex;
}
else return GSUB_E_NOGLYPH;
}
}
return -1;
}
static INT GSUB_apply_lookup(const OT_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int offset;
const OT_LookupTable *look;
offset = GET_BE_WORD(lookup->Lookup[lookup_index]);
look = (const OT_LookupTable*)((const BYTE*)lookup + offset);
TRACE("type %i, flag %x, subtables %i\n",GET_BE_WORD(look->LookupType),GET_BE_WORD(look->LookupFlag),GET_BE_WORD(look->SubTableCount));
switch(GET_BE_WORD(look->LookupType))
{
case 1:
return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
case 2:
return GSUB_apply_MultipleSubst(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:
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));
}
return GSUB_E_NOGLYPH;
}
INT OpenType_apply_GSUB_lookup(LPCVOID table, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
const GSUB_Header *header = (const GSUB_Header *)table;
const OT_LookupList *lookup = (const OT_LookupList*)((const BYTE*)header + GET_BE_WORD(header->LookupList));
return GSUB_apply_lookup(lookup, lookup_index, glyphs, glyph_index, write_dir, glyph_count);
}
/**********
* GPOS
**********/
static INT GPOS_get_device_table_value(const OT_DeviceTable *DeviceTable, WORD ppem)
{
static const WORD mask[3] = {3,0xf,0xff};
if (DeviceTable && ppem >= GET_BE_WORD(DeviceTable->StartSize) && ppem <= GET_BE_WORD(DeviceTable->EndSize))
{
int format = GET_BE_WORD(DeviceTable->DeltaFormat);
int index = ppem - GET_BE_WORD(DeviceTable->StartSize);
int value;
TRACE("device table, format %i, index %i\n",format, index);
index = index << format;
value = (DeviceTable->DeltaValue[index/sizeof(WORD)] << (index%sizeof(WORD)))&mask[format-1];
TRACE("offset %i, value %i\n",index, value);
if (value > mask[format-1]/2)
value = -1 * ((mask[format-1]+1) - value);
return value;
}
return 0;
}
static VOID GPOS_get_anchor_values(LPCVOID table, LPPOINT pt, WORD ppem)
{
const GPOS_AnchorFormat1* anchor1 = (const GPOS_AnchorFormat1*)table;
switch (GET_BE_WORD(anchor1->AnchorFormat))
{
case 1:
{
TRACE("Anchor Format 1\n");
pt->x = (short)GET_BE_WORD(anchor1->XCoordinate);
pt->y = (short)GET_BE_WORD(anchor1->YCoordinate);
break;
}
case 2:
{
const GPOS_AnchorFormat2* anchor2 = (const GPOS_AnchorFormat2*)table;
TRACE("Anchor Format 2\n");
pt->x = (short)GET_BE_WORD(anchor2->XCoordinate);
pt->y = (short)GET_BE_WORD(anchor2->YCoordinate);
break;
}
case 3:
{
int offset;
const GPOS_AnchorFormat3* anchor3 = (const GPOS_AnchorFormat3*)table;
TRACE("Anchor Format 3\n");
pt->x = (short)GET_BE_WORD(anchor3->XCoordinate);
pt->y = (short)GET_BE_WORD(anchor3->YCoordinate);
offset = GET_BE_WORD(anchor3->XDeviceTable);
TRACE("ppem %i\n",ppem);
if (offset)
{
const OT_DeviceTable* DeviceTableX = NULL;
DeviceTableX = (const OT_DeviceTable*)((const BYTE*)anchor3 + offset);
pt->x += GPOS_get_device_table_value(DeviceTableX, ppem);
}
offset = GET_BE_WORD(anchor3->YDeviceTable);
if (offset)
{
const OT_DeviceTable* DeviceTableY = NULL;
DeviceTableY = (const OT_DeviceTable*)((const BYTE*)anchor3 + offset);
pt->y += GPOS_get_device_table_value(DeviceTableY, ppem);
}
break;
}
default:
ERR("Unknown Anchor Format %i\n",GET_BE_WORD(anchor1->AnchorFormat));
pt->x = 0;
pt->y = 0;
}
}
static INT GPOS_apply_lookup(LPOUTLINETEXTMETRICW lpotm, LPLOGFONTW lplogfont, INT* piAdvance, const OT_LookupList* lookup, INT lookup_index, const WORD *glyphs, INT glyph_index, INT write_dir, INT glyph_count, GOFFSET *pGoffset)
{
int offset;
const OT_LookupTable *look;
offset = GET_BE_WORD(lookup->Lookup[lookup_index]);
look = (const OT_LookupTable*)((const BYTE*)lookup + offset);
TRACE("type %i, flag %x, subtables %i\n",GET_BE_WORD(look->LookupType),GET_BE_WORD(look->LookupFlag),GET_BE_WORD(look->SubTableCount));
switch(GET_BE_WORD(look->LookupType))
{
default:
FIXME("We do not handle SubType %i\n",GET_BE_WORD(look->LookupType));
}
return glyph_index+1;
}
INT OpenType_apply_GPOS_lookup(LPOUTLINETEXTMETRICW lpotm, LPLOGFONTW lplogfont, INT* piAdvance, LPCVOID table, INT lookup_index, const WORD *glyphs, INT glyph_index, INT write_dir, INT glyph_count, GOFFSET *pGoffset)
{
const GPOS_Header *header = (const GPOS_Header *)table;
const OT_LookupList *lookup = (const OT_LookupList*)((const BYTE*)header + GET_BE_WORD(header->LookupList));
return GPOS_apply_lookup(lpotm, lplogfont, piAdvance, lookup, lookup_index, glyphs, glyph_index, write_dir, glyph_count, pGoffset);
}
static void GSUB_initialize_script_cache(ScriptCache *psc)
{
int i;
if (psc->GSUB_Table)
{
const OT_ScriptList *script;
const GSUB_Header* header = (const GSUB_Header*)psc->GSUB_Table;
script = (const OT_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));
psc->script_count = GET_BE_WORD(script->ScriptCount);
TRACE("initializing %i scripts in this font\n",psc->script_count);
if (psc->script_count)
{
psc->scripts = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(LoadedScript) * psc->script_count);
for (i = 0; i < psc->script_count; i++)
{
int offset = GET_BE_WORD(script->ScriptRecord[i].Script);
psc->scripts[i].tag = MS_MAKE_TAG(script->ScriptRecord[i].ScriptTag[0], script->ScriptRecord[i].ScriptTag[1], script->ScriptRecord[i].ScriptTag[2], script->ScriptRecord[i].ScriptTag[3]);
psc->scripts[i].gsub_table = ((const BYTE*)script + offset);
}
}
}
}
static void GPOS_expand_script_cache(ScriptCache *psc)
{
int i, count;
const OT_ScriptList *script;
const GPOS_Header* header = (const GPOS_Header*)psc->GPOS_Table;
if (!header)
return;
script = (const OT_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));
count = GET_BE_WORD(script->ScriptCount);
if (!psc->script_count)
{
psc->script_count = count;
TRACE("initializing %i scripts in this font\n",psc->script_count);
if (psc->script_count)
{
psc->scripts = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(LoadedScript) * psc->script_count);
for (i = 0; i < psc->script_count; i++)
{
int offset = GET_BE_WORD(script->ScriptRecord[i].Script);
psc->scripts[i].tag = MS_MAKE_TAG(script->ScriptRecord[i].ScriptTag[0], script->ScriptRecord[i].ScriptTag[1], script->ScriptRecord[i].ScriptTag[2], script->ScriptRecord[i].ScriptTag[3]);
psc->scripts[i].gpos_table = ((const BYTE*)script + offset);
}
}
}
else
{
for (i = 0; i < count; i++)
{
int j;
int offset = GET_BE_WORD(script->ScriptRecord[i].Script);
OPENTYPE_TAG tag = MS_MAKE_TAG(script->ScriptRecord[i].ScriptTag[0], script->ScriptRecord[i].ScriptTag[1], script->ScriptRecord[i].ScriptTag[2], script->ScriptRecord[i].ScriptTag[3]);
for (j = 0; j < psc->script_count; j++)
{
if (psc->scripts[j].tag == tag)
{
psc->scripts[j].gpos_table = ((const BYTE*)script + offset);
break;
}
}
if (j == psc->script_count)
{
psc->script_count++;
psc->scripts = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,psc->scripts, sizeof(LoadedScript) * psc->script_count);
psc->scripts[j].tag = tag;
psc->scripts[j].gpos_table = ((const BYTE*)script + offset);
}
}
}
}
static void _initialize_script_cache(ScriptCache *psc)
{
if (!psc->script_count)
{
GSUB_initialize_script_cache(psc);
GPOS_expand_script_cache(psc);
}
}
HRESULT OpenType_GetFontScriptTags(ScriptCache *psc, OPENTYPE_TAG searchingFor, int cMaxTags, OPENTYPE_TAG *pScriptTags, int *pcTags)
{
int i;
HRESULT rc = S_OK;
_initialize_script_cache(psc);
*pcTags = psc->script_count;
if (!searchingFor && cMaxTags < *pcTags)
rc = E_OUTOFMEMORY;
else if (searchingFor)
rc = USP_E_SCRIPT_NOT_IN_FONT;
for (i = 0; i < psc->script_count; i++)
{
if (i < cMaxTags)
pScriptTags[i] = psc->scripts[i].tag;
if (searchingFor)
{
if (searchingFor == psc->scripts[i].tag)
{
pScriptTags[0] = psc->scripts[i].tag;
*pcTags = 1;
rc = S_OK;
break;
}
}
}
return rc;
}
static void GSUB_initialize_language_cache(LoadedScript *script)
{
int i;
if (script->gsub_table)
{
DWORD offset;
const OT_Script* table = script->gsub_table;
script->language_count = GET_BE_WORD(table->LangSysCount);
offset = GET_BE_WORD(table->DefaultLangSys);
if (offset)
{
script->default_language.tag = MS_MAKE_TAG('d','f','l','t');
script->default_language.gsub_table = (const BYTE*)table + offset;
}
if (script->language_count)
{
TRACE("Deflang %p, LangCount %i\n",script->default_language.gsub_table, script->language_count);
script->languages = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(LoadedLanguage) * script->language_count);
for (i = 0; i < script->language_count; i++)
{
int offset = GET_BE_WORD(table->LangSysRecord[i].LangSys);
script->languages[i].tag = MS_MAKE_TAG(table->LangSysRecord[i].LangSysTag[0], table->LangSysRecord[i].LangSysTag[1], table->LangSysRecord[i].LangSysTag[2], table->LangSysRecord[i].LangSysTag[3]);
script->languages[i].gsub_table = ((const BYTE*)table + offset);
}
}
}
}
static void GPOS_expand_language_cache(LoadedScript *script)
{
int count;
const OT_Script* table = script->gpos_table;
DWORD offset;
if (!table)
return;
offset = GET_BE_WORD(table->DefaultLangSys);
if (offset)
script->default_language.gpos_table = (const BYTE*)table + offset;
count = GET_BE_WORD(table->LangSysCount);
TRACE("Deflang %p, LangCount %i\n",script->default_language.gpos_table, count);
if (!script->language_count)
{
int i;
script->language_count = count;
script->languages = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(LoadedLanguage) * script->language_count);
for (i = 0; i < script->language_count; i++)
{
int offset = GET_BE_WORD(table->LangSysRecord[i].LangSys);
script->languages[i].tag = MS_MAKE_TAG(table->LangSysRecord[i].LangSysTag[0], table->LangSysRecord[i].LangSysTag[1], table->LangSysRecord[i].LangSysTag[2], table->LangSysRecord[i].LangSysTag[3]);
script->languages[i].gpos_table = ((const BYTE*)table + offset);
}
}
else if (count)
{
int i,j;
for (i = 0; i < count; i++)
{
int offset = GET_BE_WORD(table->LangSysRecord[i].LangSys);
OPENTYPE_TAG tag = MS_MAKE_TAG(table->LangSysRecord[i].LangSysTag[0], table->LangSysRecord[i].LangSysTag[1], table->LangSysRecord[i].LangSysTag[2], table->LangSysRecord[i].LangSysTag[3]);
for (j = 0; j < script->language_count; j++)
{
if (script->languages[j].tag == tag)
{
script->languages[j].gpos_table = ((const BYTE*)table + offset);
break;
}
}
if (j == script->language_count)
{
script->language_count++;
script->languages = HeapReAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,script->languages, sizeof(LoadedLanguage) * script->language_count);
script->languages[j].tag = tag;
script->languages[j].gpos_table = ((const BYTE*)table + offset);
}
}
}
}
static void _initialize_language_cache(LoadedScript *script)
{
if (!script->language_count)
{
GSUB_initialize_language_cache(script);
GPOS_expand_language_cache(script);
}
}
HRESULT OpenType_GetFontLanguageTags(ScriptCache *psc, OPENTYPE_TAG script_tag, OPENTYPE_TAG searchingFor, int cMaxTags, OPENTYPE_TAG *pLanguageTags, int *pcTags)
{
int i;
HRESULT rc = S_OK;
LoadedScript *script = NULL;
_initialize_script_cache(psc);
for (i = 0; i < psc->script_count; i++)
{
if (psc->scripts[i].tag == script_tag)
{
script = &psc->scripts[i];
break;
}
}
if (!script)
return E_INVALIDARG;
_initialize_language_cache(script);
if (!searchingFor && cMaxTags < script->language_count)
rc = E_OUTOFMEMORY;
else if (searchingFor)
rc = E_INVALIDARG;
*pcTags = script->language_count;
for (i = 0; i < script->language_count; i++)
{
if (i < cMaxTags)
pLanguageTags[i] = script->languages[i].tag;
if (searchingFor)
{
if (searchingFor == script->languages[i].tag)
{
pLanguageTags[0] = script->languages[i].tag;
*pcTags = 1;
rc = S_OK;
break;
}
}
}
if (script->default_language.gsub_table)
{
if (i < cMaxTags)
pLanguageTags[i] = script->default_language.tag;
if (searchingFor && FAILED(rc))
{
pLanguageTags[0] = script->default_language.tag;
}
i++;
*pcTags = (*pcTags) + 1;
}
return rc;
}
static void GSUB_initialize_feature_cache(LPCVOID table, LoadedLanguage *language)
{
int i;
if (language->gsub_table)
{
const OT_LangSys *lang = language->gsub_table;
const GSUB_Header *header = (const GSUB_Header *)table;
const OT_FeatureList *feature_list;
language->feature_count = GET_BE_WORD(lang->FeatureCount);
TRACE("%i features\n",language->feature_count);
if (language->feature_count)
{
language->features = HeapAlloc(GetProcessHeap(),0,sizeof(LoadedFeature)*language->feature_count);
feature_list = (const OT_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
for (i = 0; i < language->feature_count; i++)
{
const OT_Feature *feature;
int j;
int index = GET_BE_WORD(lang->FeatureIndex[i]);
language->features[i].tag = MS_MAKE_TAG(feature_list->FeatureRecord[index].FeatureTag[0], feature_list->FeatureRecord[index].FeatureTag[1], feature_list->FeatureRecord[index].FeatureTag[2], feature_list->FeatureRecord[index].FeatureTag[3]);
language->features[i].feature = ((const BYTE*)feature_list + GET_BE_WORD(feature_list->FeatureRecord[index].Feature));
feature = (const OT_Feature*)language->features[i].feature;
language->features[i].lookup_count = GET_BE_WORD(feature->LookupCount);
language->features[i].lookups = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * language->features[i].lookup_count);
for (j = 0; j < language->features[i].lookup_count; j++)
language->features[i].lookups[j] = GET_BE_WORD(feature->LookupListIndex[j]);
}
}
}
}
static void GPOS_expand_feature_cache(LPCVOID table, LoadedLanguage *language)
{
int i, count;
const OT_LangSys *lang = language->gpos_table;
const GPOS_Header *header = (const GPOS_Header *)table;
const OT_FeatureList *feature_list;
if (!lang)
return;
count = GET_BE_WORD(lang->FeatureCount);
feature_list = (const OT_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
TRACE("%i features\n",count);
if (!language->feature_count)
{
language->feature_count = count;
if (language->feature_count)
{
language->features = HeapAlloc(GetProcessHeap(),0,sizeof(LoadedFeature)*language->feature_count);
for (i = 0; i < language->feature_count; i++)
{
const OT_Feature *feature;
int j;
int index = GET_BE_WORD(lang->FeatureIndex[i]);
language->features[i].tag = MS_MAKE_TAG(feature_list->FeatureRecord[index].FeatureTag[0], feature_list->FeatureRecord[index].FeatureTag[1], feature_list->FeatureRecord[index].FeatureTag[2], feature_list->FeatureRecord[index].FeatureTag[3]);
language->features[i].feature = ((const BYTE*)feature_list + GET_BE_WORD(feature_list->FeatureRecord[index].Feature));
feature = (const OT_Feature*)language->features[i].feature;
language->features[i].lookup_count = GET_BE_WORD(feature->LookupCount);
language->features[i].lookups = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * language->features[i].lookup_count);
for (j = 0; j < language->features[i].lookup_count; j++)
language->features[i].lookups[j] = GET_BE_WORD(feature->LookupListIndex[j]);
}
}
}
else if (count)
{
language->features = HeapReAlloc(GetProcessHeap(),0,language->features, sizeof(LoadedFeature)*(language->feature_count + count));
for (i = 0; i < count; i++)
{
const OT_Feature *feature;
int j;
int index = GET_BE_WORD(lang->FeatureIndex[i]);
int idx = language->feature_count + i;
language->features[idx].tag = MS_MAKE_TAG(feature_list->FeatureRecord[index].FeatureTag[0], feature_list->FeatureRecord[index].FeatureTag[1], feature_list->FeatureRecord[index].FeatureTag[2], feature_list->FeatureRecord[index].FeatureTag[3]);
language->features[idx].feature = ((const BYTE*)feature_list + GET_BE_WORD(feature_list->FeatureRecord[index].Feature));
feature = (const OT_Feature*)language->features[idx].feature;
language->features[idx].lookup_count = GET_BE_WORD(feature->LookupCount);
language->features[idx].lookups = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * language->features[idx].lookup_count);
for (j = 0; j < language->features[idx].lookup_count; j++)
language->features[idx].lookups[j] = GET_BE_WORD(feature->LookupListIndex[j]);
}
language->feature_count += count;
}
}
static void _initialize_feature_cache(ScriptCache *psc, LoadedLanguage *language)
{
if (!language->feature_count)
{
GSUB_initialize_feature_cache(psc->GSUB_Table, language);
GPOS_expand_feature_cache(psc->GPOS_Table, language);
}
}
HRESULT OpenType_GetFontFeatureTags(ScriptCache *psc, OPENTYPE_TAG script_tag, OPENTYPE_TAG language_tag, BOOL filtered, OPENTYPE_TAG searchingFor, int cMaxTags, OPENTYPE_TAG *pFeatureTags, int *pcTags, LoadedFeature** feature)
{
int i;
HRESULT rc = S_OK;
LoadedScript *script = NULL;
LoadedLanguage *language = NULL;
_initialize_script_cache(psc);
for (i = 0; i < psc->script_count; i++)
{
if (psc->scripts[i].tag == script_tag)
{
script = &psc->scripts[i];
break;
}
}
if (!script)
{
*pcTags = 0;
if (!filtered)
return S_OK;
else
return E_INVALIDARG;
}
_initialize_language_cache(script);
if ((script->default_language.gsub_table || script->default_language.gpos_table) && script->default_language.tag == language_tag)
language = &script->default_language;
else
{
for (i = 0; i < script->language_count; i++)
{
if (script->languages[i].tag == language_tag)
{
language = &script->languages[i];
break;
}
}
}
if (!language)
{
*pcTags = 0;
return S_OK;
}
_initialize_feature_cache(psc, language);
*pcTags = language->feature_count;
if (!searchingFor && cMaxTags < *pcTags)
rc = E_OUTOFMEMORY;
else if (searchingFor)
rc = E_INVALIDARG;
for (i = 0; i < language->feature_count; i++)
{
if (i < cMaxTags)
pFeatureTags[i] = language->features[i].tag;
if (searchingFor)
{
if (searchingFor == language->features[i].tag)
{
pFeatureTags[0] = language->features[i].tag;
*pcTags = 1;
if (feature)
*feature = &language->features[i];
rc = S_OK;
break;
}
}
}
return rc;
}
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