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/*
* Implementation of Shaping for the Uniscribe Script Processor (usp10.dll)
*
* Copyright 2010 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 "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);
#define FIRST_ARABIC_CHAR 0x0600
#define LAST_ARABIC_CHAR 0x06ff
extern const unsigned short wine_shaping_table[];
extern const unsigned short wine_shaping_forms[LAST_ARABIC_CHAR - FIRST_ARABIC_CHAR + 1][4];
enum joining_types {
jtU,
jtT,
jtR,
jtL,
jtD,
jtC
};
enum joined_forms {
Xn=0,
Xr,
Xl,
Xm
};
#ifdef WORDS_BIGENDIAN
#define GET_BE_WORD(x) (x)
#else
#define GET_BE_WORD(x) RtlUshortByteSwap(x)
#endif
/* These are all structures needed for the GSUB table */
#define MS_MAKE_TAG( _x1, _x2, _x3, _x4 ) \
( ( (ULONG)_x4 << 24 ) | \
( (ULONG)_x3 << 16 ) | \
( (ULONG)_x2 << 8 ) | \
(ULONG)_x1 )
#define GSUB_TAG MS_MAKE_TAG('G', 'S', 'U', 'B')
#define GSUB_E_NOFEATURE -2
#define GSUB_E_NOGLYPH -1
typedef struct {
DWORD version;
WORD ScriptList;
WORD FeatureList;
WORD LookupList;
} GSUB_Header;
typedef struct {
CHAR ScriptTag[4];
WORD Script;
} GSUB_ScriptRecord;
typedef struct {
WORD ScriptCount;
GSUB_ScriptRecord ScriptRecord[1];
} GSUB_ScriptList;
typedef struct {
CHAR LangSysTag[4];
WORD LangSys;
} GSUB_LangSysRecord;
typedef struct {
WORD DefaultLangSys;
WORD LangSysCount;
GSUB_LangSysRecord LangSysRecord[1];
} GSUB_Script;
typedef struct {
WORD LookupOrder; /* Reserved */
WORD ReqFeatureIndex;
WORD FeatureCount;
WORD FeatureIndex[1];
} GSUB_LangSys;
typedef struct {
CHAR FeatureTag[4];
WORD Feature;
} GSUB_FeatureRecord;
typedef struct {
WORD FeatureCount;
GSUB_FeatureRecord FeatureRecord[1];
} GSUB_FeatureList;
typedef struct {
WORD FeatureParams; /* Reserved */
WORD LookupCount;
WORD LookupListIndex[1];
} GSUB_Feature;
typedef struct {
WORD LookupCount;
WORD Lookup[1];
} GSUB_LookupList;
typedef struct {
WORD LookupType;
WORD LookupFlag;
WORD SubTableCount;
WORD SubTable[1];
} GSUB_LookupTable;
typedef struct {
WORD CoverageFormat;
WORD GlyphCount;
WORD GlyphArray[1];
} GSUB_CoverageFormat1;
typedef struct {
WORD Start;
WORD End;
WORD StartCoverageIndex;
} GSUB_RangeRecord;
typedef struct {
WORD CoverageFormat;
WORD RangeCount;
GSUB_RangeRecord RangeRecord[1];
} GSUB_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 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;
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[] =
{
"isol",
"fina",
"init",
"medi"
};
static const char* arabic_GSUB_features[] =
{
"rlig",
"calt",
"liga",
"dlig",
"cswh",
"mset",
NULL
};
static INT GSUB_is_glyph_covered(LPCVOID table , UINT glyph)
{
const GSUB_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 GSUB_CoverageFormat2* cf2;
int i;
int count;
cf2 = (const GSUB_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 const GSUB_Script* GSUB_get_script_table( const GSUB_Header* header, const char* tag)
{
const GSUB_ScriptList *script;
const GSUB_Script *deflt = NULL;
int i;
script = (const GSUB_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));
TRACE("%i scripts in this font\n",GET_BE_WORD(script->ScriptCount));
for (i = 0; i < GET_BE_WORD(script->ScriptCount); i++)
{
const GSUB_Script *scr;
int offset;
offset = GET_BE_WORD(script->ScriptRecord[i].Script);
scr = (const GSUB_Script*)((const BYTE*)script + offset);
if (strncmp(script->ScriptRecord[i].ScriptTag, tag,4)==0)
return scr;
if (strncmp(script->ScriptRecord[i].ScriptTag, "dflt",4)==0)
deflt = scr;
}
return deflt;
}
static const GSUB_LangSys* GSUB_get_lang_table( const GSUB_Script* script, const char* tag)
{
int i;
int offset;
const GSUB_LangSys *Lang;
TRACE("Deflang %x, LangCount %i\n",GET_BE_WORD(script->DefaultLangSys), GET_BE_WORD(script->LangSysCount));
for (i = 0; i < GET_BE_WORD(script->LangSysCount) ; i++)
{
offset = GET_BE_WORD(script->LangSysRecord[i].LangSys);
Lang = (const GSUB_LangSys*)((const BYTE*)script + offset);
if ( strncmp(script->LangSysRecord[i].LangSysTag,tag,4)==0)
return Lang;
}
offset = GET_BE_WORD(script->DefaultLangSys);
if (offset)
{
Lang = (const GSUB_LangSys*)((const BYTE*)script + offset);
return Lang;
}
return NULL;
}
static const GSUB_Feature * GSUB_get_feature(const GSUB_Header *header, const GSUB_LangSys *lang, const char* tag)
{
int i;
const GSUB_FeatureList *feature;
feature = (const GSUB_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
TRACE("%i features\n",GET_BE_WORD(lang->FeatureCount));
for (i = 0; i < GET_BE_WORD(lang->FeatureCount); i++)
{
int index = GET_BE_WORD(lang->FeatureIndex[i]);
if (strncmp(feature->FeatureRecord[index].FeatureTag,tag,4)==0)
{
const GSUB_Feature *feat;
feat = (const GSUB_Feature*)((const BYTE*)feature + GET_BE_WORD(feature->FeatureRecord[index].Feature));
return feat;
}
}
return NULL;
}
static INT GSUB_apply_SingleSubst(const GSUB_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 + 1;
}
}
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)
{
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 + 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;
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 + 1;
}
}
}
}
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;
const GSUB_LookupTable *look;
offset = GET_BE_WORD(lookup->Lookup[lookup_index]);
look = (const GSUB_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 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;
}
static INT GSUB_apply_feature(const GSUB_Header * header, const GSUB_Feature* feature, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
{
int i;
int out_index = GSUB_E_NOGLYPH;
const GSUB_LookupList *lookup;
lookup = (const GSUB_LookupList*)((const BYTE*)header + GET_BE_WORD(header->LookupList));
TRACE("%i lookups\n", GET_BE_WORD(feature->LookupCount));
for (i = 0; i < GET_BE_WORD(feature->LookupCount); i++)
{
out_index = GSUB_apply_lookup(lookup, GET_BE_WORD(feature->LookupListIndex[i]), glyphs, glyph_index, write_dir, glyph_count);
if (out_index != GSUB_E_NOGLYPH)
break;
}
if (out_index == GSUB_E_NOGLYPH)
TRACE("lookups found no glyphs\n");
return out_index;
}
static const char* get_opentype_script(HDC hdc, SCRIPT_ANALYSIS *psa)
{
UINT charset;
switch (psa->eScript)
{
case Script_Arabic:
return "arab";
case Script_Syriac:
return "syrc";
case Script_Hebrew:
return "hebr";
case Script_Latin:
case Script_Numeric:
case Script_CR:
case Script_LF:
return "latn";
}
/*
* fall back to the font charset
*/
charset = GetTextCharsetInfo(hdc, NULL, 0x0);
switch (charset)
{
case ANSI_CHARSET: return "latn";
case BALTIC_CHARSET: return "latn"; /* ?? */
case CHINESEBIG5_CHARSET: return "hani";
case EASTEUROPE_CHARSET: return "latn"; /* ?? */
case GB2312_CHARSET: return "hani";
case GREEK_CHARSET: return "grek";
case HANGUL_CHARSET: return "hang";
case RUSSIAN_CHARSET: return "cyrl";
case SHIFTJIS_CHARSET: return "kana";
case TURKISH_CHARSET: return "latn"; /* ?? */
case VIETNAMESE_CHARSET: return "latn";
case JOHAB_CHARSET: return "latn"; /* ?? */
case ARABIC_CHARSET: return "arab";
case HEBREW_CHARSET: return "hebr";
case THAI_CHARSET: return "thai";
default: return "latn";
}
}
static INT apply_GSUB_feature_to_glyph(HDC hdc, SCRIPT_ANALYSIS *psa, void* GSUB_Table, WORD *glyphs, INT index, INT write_dir, INT* glyph_count, const char* feat)
{
const GSUB_Header *header;
const GSUB_Script *script;
const GSUB_LangSys *language;
const GSUB_Feature *feature;
if (!GSUB_Table)
return GSUB_E_NOFEATURE;
header = GSUB_Table;
script = GSUB_get_script_table(header, get_opentype_script(hdc,psa));
if (!script)
{
TRACE("Script not found\n");
return GSUB_E_NOFEATURE;
}
language = GSUB_get_lang_table(script, "xxxx"); /* Need to get Lang tag */
if (!language)
{
TRACE("Language not found\n");
return GSUB_E_NOFEATURE;
}
feature = GSUB_get_feature(header, language, feat);
if (!feature)
{
TRACE("%s feature not found\n",feat);
return GSUB_E_NOFEATURE;
}
TRACE("applying feature %s\n",feat);
return GSUB_apply_feature(header, feature, glyphs, index, write_dir, glyph_count);
}
static VOID *load_gsub_table(HDC hdc)
{
VOID* GSUB_Table = NULL;
int length = GetFontData(hdc, GSUB_TAG , 0, NULL, 0);
if (length != GDI_ERROR)
{
GSUB_Table = HeapAlloc(GetProcessHeap(),0,length);
GetFontData(hdc, GSUB_TAG , 0, GSUB_Table, length);
TRACE("Loaded GSUB table of %i bytes\n",length);
}
return GSUB_Table;
}
static int apply_GSUB_feature(HDC hdc, SCRIPT_ANALYSIS *psa, void* GSUB_Table, WORD *pwOutGlyphs, int write_dir, INT* pcGlyphs, const char* feat)
{
int i;
if (GSUB_Table)
{
const GSUB_Header *header;
const GSUB_Script *script;
const GSUB_LangSys *language;
const GSUB_Feature *feature;
if (!GSUB_Table)
return GSUB_E_NOFEATURE;
header = GSUB_Table;
script = GSUB_get_script_table(header, get_opentype_script(hdc,psa));
if (!script)
{
TRACE("Script not found\n");
return GSUB_E_NOFEATURE;
}
language = GSUB_get_lang_table(script, "xxxx");
if (!language)
{
TRACE("Language not found\n");
return GSUB_E_NOFEATURE;
}
feature = GSUB_get_feature(header, language, feat);
if (!feature)
{
TRACE("%s feature not found\n",feat);
return GSUB_E_NOFEATURE;
}
i = 0;
TRACE("applying feature %s\n",feat);
while(i < *pcGlyphs)
{
INT nextIndex;
nextIndex = GSUB_apply_feature(header, feature, pwOutGlyphs, i, write_dir, pcGlyphs);
if (nextIndex > GSUB_E_NOGLYPH)
i = nextIndex;
else
i++;
}
return *pcGlyphs;
}
return GSUB_E_NOFEATURE;
}
static CHAR neighbour_joining_type(int i, int delta, const CHAR* context_type, INT cchLen, SCRIPT_ANALYSIS *psa)
{
if (i + delta < 0)
{
if (psa->fLinkBefore)
return jtR;
else
return jtU;
}
if ( i+ delta >= cchLen)
{
if (psa->fLinkAfter)
return jtL;
else
return jtU;
}
i += delta;
if (context_type[i] == jtT)
return neighbour_joining_type(i,delta,context_type,cchLen,psa);
else
return context_type[i];
}
static inline BOOL right_join_causing(CHAR joining_type)
{
return (joining_type == jtL || joining_type == jtD || joining_type == jtC);
}
static inline BOOL left_join_causing(CHAR joining_type)
{
return (joining_type == jtR || joining_type == jtD || joining_type == jtC);
}
/* SHAPE_ShapeArabicGlyphs
*/
void SHAPE_ShapeArabicGlyphs(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs)
{
CHAR *context_type;
INT *context_shape;
INT dirR, dirL;
int i;
if (psa->eScript != Script_Arabic)
return;
if (*pcGlyphs != cChars)
{
ERR("Number of Glyphs and Chars need to match at the beginning\n");
return;
}
if (!psa->fLogicalOrder && psa->fRTL)
{
dirR = 1;
dirL = -1;
}
else
{
dirR = -1;
dirL = 1;
}
if (!psc->GSUB_Table)
psc->GSUB_Table = load_gsub_table(hdc);
context_type = HeapAlloc(GetProcessHeap(),0,cChars);
context_shape = HeapAlloc(GetProcessHeap(),0,sizeof(INT) * cChars);
for (i = 0; i < cChars; i++)
context_type[i] = wine_shaping_table[wine_shaping_table[pwcChars[i] >> 8] + (pwcChars[i] & 0xff)];
for (i = 0; i < cChars; i++)
{
if (context_type[i] == jtR && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
context_shape[i] = Xr;
else if (context_type[i] == jtL && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)))
context_shape[i] = Xl;
else if (context_type[i] == jtD && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)) && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
context_shape[i] = Xm;
else if (context_type[i] == jtD && right_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)))
context_shape[i] = Xr;
else if (context_type[i] == jtD && left_join_causing(neighbour_joining_type(i,dirL,context_type,cChars,psa)))
context_shape[i] = Xl;
else
context_shape[i] = Xn;
}
/* Contextual Shaping */
i = 0;
while(i < *pcGlyphs)
{
BOOL shaped = FALSE;
if (psc->GSUB_Table)
{
INT nextIndex;
nextIndex = apply_GSUB_feature_to_glyph(hdc, psa, psc->GSUB_Table, pwOutGlyphs, i, dirL, pcGlyphs, contextual_features[context_shape[i]]);
if (nextIndex > GSUB_E_NOGLYPH)
i = nextIndex;
shaped = (nextIndex > GSUB_E_NOGLYPH);
}
if (!shaped)
{
WORD newGlyph = pwOutGlyphs[i];
if (pwcChars[i] >= FIRST_ARABIC_CHAR && pwcChars[i] <= LAST_ARABIC_CHAR)
{
/* fall back to presentation form B */
WCHAR context_char = wine_shaping_forms[pwcChars[i] - FIRST_ARABIC_CHAR][context_shape[i]];
if (context_char != pwcChars[i] && GetGlyphIndicesW(hdc, &context_char, 1, &newGlyph, 0) != GDI_ERROR && newGlyph != 0x0000)
pwOutGlyphs[i] = newGlyph;
}
i++;
}
}
i = 0;
while (arabic_GSUB_features[i] != NULL)
{
apply_GSUB_feature(hdc, psa, psc->GSUB_Table, pwOutGlyphs, dirL, pcGlyphs, arabic_GSUB_features[i]);
i++;
}
HeapFree(GetProcessHeap(),0,context_shape);
HeapFree(GetProcessHeap(),0,context_type);
}
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