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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
typedef VOID (*ContextualShapingProc)(HDC, ScriptCache*, SCRIPT_ANALYSIS*,
WCHAR*, INT, WORD*, INT*, INT, WORD*);
static void ContextualShape_Arabic(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust);
static void ContextualShape_Syriac(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust);
static void ContextualShape_Phags_pa(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust);
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,
/* Syriac Alaph */
Afj,
Afn,
Afx
};
#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;
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 */
static const char* contextual_features[] =
{
"isol",
"fina",
"init",
"medi",
/* Syriac Alaph */
"med2",
"fin2",
"fin3"
};
static OPENTYPE_FEATURE_RECORD standard_features[] =
{
{ 0x6167696c /*liga*/, 1},
{ 0x67696c63 /*clig*/, 1},
};
static OPENTYPE_FEATURE_RECORD arabic_features[] =
{
{ 0x67696c72 /*rlig*/, 1},
{ 0x746c6163 /*calt*/, 1},
{ 0x6167696c /*liga*/, 1},
{ 0x67696c64 /*dlig*/, 1},
{ 0x68777363 /*cswh*/, 1},
{ 0x7465736d /*mset*/, 1},
};
static const char* required_arabic_features[] =
{
"fina",
"init",
"medi",
"rlig",
NULL
};
static OPENTYPE_FEATURE_RECORD hebrew_features[] =
{
{ 0x67696c64 /*dlig*/, 1},
};
static OPENTYPE_FEATURE_RECORD syriac_features[] =
{
{ 0x67696c72 /*rlig*/, 1},
{ 0x746c6163 /*calt*/, 1},
{ 0x6167696c /*liga*/, 1},
{ 0x67696c64 /*dlig*/, 1},
};
static const char* required_syriac_features[] =
{
"fina",
"fin2",
"fin3",
"init",
"medi",
"med2",
"rlig",
NULL
};
static OPENTYPE_FEATURE_RECORD sinhala_features[] =
{
/* Base forms */
{ 0x6e686b61 /*akhn*/, 1},
{ 0x66687072 /*rphf*/, 1},
{ 0x75746176 /*vatu*/, 1},
{ 0x66747370 /*pstf*/, 1},
/* Presentation forms */
{ 0x73776c62 /*blws*/, 1},
{ 0x73766261 /*abvs*/, 1},
{ 0x73747370 /*psts*/, 1},
};
static OPENTYPE_FEATURE_RECORD tibetan_features[] =
{
{ 0x73766261 /*abvs*/, 1},
{ 0x73776c62 /*blws*/, 1},
};
static OPENTYPE_FEATURE_RECORD thai_features[] =
{
{ 0x706d6363 /*ccmp*/, 1},
};
static const char* required_lao_features[] =
{
"ccmp",
NULL
};
typedef struct ScriptShapeDataTag {
TEXTRANGE_PROPERTIES defaultTextRange;
const char** requiredFeatures;
CHAR otTag[5];
ContextualShapingProc contextProc;
} ScriptShapeData;
/* in order of scripts */
static const ScriptShapeData ShapingData[] =
{
{{ standard_features, 2}, NULL, "", NULL},
{{ standard_features, 2}, NULL, "latn", NULL},
{{ standard_features, 2}, NULL, "latn", NULL},
{{ standard_features, 2}, NULL, "latn", NULL},
{{ standard_features, 2}, NULL, "" , NULL},
{{ standard_features, 2}, NULL, "latn", NULL},
{{ arabic_features, 6}, required_arabic_features, "arab", ContextualShape_Arabic},
{{ arabic_features, 6}, required_arabic_features, "arab", ContextualShape_Arabic},
{{ hebrew_features, 1}, NULL, "hebr", NULL},
{{ syriac_features, 4}, required_syriac_features, "syrc", ContextualShape_Syriac},
{{ arabic_features, 6}, required_arabic_features, "arab", ContextualShape_Arabic},
{{ NULL, 0}, NULL, "thaa", NULL},
{{ standard_features, 2}, NULL, "grek", NULL},
{{ standard_features, 2}, NULL, "cyrl", NULL},
{{ standard_features, 2}, NULL, "armn", NULL},
{{ standard_features, 2}, NULL, "geor", NULL},
{{ sinhala_features, 7}, NULL, "sinh", NULL},
{{ tibetan_features, 2}, NULL, "tibt", NULL},
{{ tibetan_features, 2}, NULL, "tibt", NULL},
{{ tibetan_features, 2}, NULL, "phag", ContextualShape_Phags_pa},
{{ thai_features, 1}, NULL, "thai", NULL},
{{ thai_features, 1}, NULL, "thai", NULL},
{{ thai_features, 1}, required_lao_features, "lao", NULL},
{{ thai_features, 1}, required_lao_features, "lao", 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_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;
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 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;
}
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;
if (ShapingData[psa->eScript].otTag[0] != 0)
return ShapingData[psa->eScript].otTag;
/*
* 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 LPCVOID load_GSUB_feature(HDC hdc, SCRIPT_ANALYSIS *psa, ScriptCache *psc, const char* feat)
{
const GSUB_Feature *feature;
int i;
for (i = 0; i < psc->feature_count; i++)
if (strncmp(psc->features[i].tag,feat,4)==0)
return psc->features[i].feature;
feature = NULL;
if (psc->GSUB_Table)
{
const GSUB_Script *script;
const GSUB_LangSys *language;
script = GSUB_get_script_table(psc->GSUB_Table, get_opentype_script(hdc,psa));
if (script)
{
language = GSUB_get_lang_table(script, "xxxx"); /* Need to get Lang tag */
if (language)
feature = GSUB_get_feature(psc->GSUB_Table, language, feat);
}
/* try in the default (latin) table */
if (!feature)
{
script = GSUB_get_script_table(psc->GSUB_Table, "latn");
if (script)
{
language = GSUB_get_lang_table(script, "xxxx"); /* Need to get Lang tag */
if (language)
feature = GSUB_get_feature(psc->GSUB_Table, language, feat);
}
}
}
TRACE("Feature %s located at %p\n",debugstr_an(feat,4),feature);
psc->feature_count++;
if (psc->features)
psc->features = HeapReAlloc(GetProcessHeap(), 0, psc->features, psc->feature_count * sizeof(LoadedFeature));
else
psc->features = HeapAlloc(GetProcessHeap(), 0, psc->feature_count * sizeof(LoadedFeature));
lstrcpynA(psc->features[psc->feature_count - 1].tag, feat, 5);
psc->features[psc->feature_count - 1].feature = feature;
return feature;
}
static INT apply_GSUB_feature_to_glyph(HDC hdc, SCRIPT_ANALYSIS *psa, ScriptCache* psc, WORD *glyphs, INT index, INT write_dir, INT* glyph_count, const char* feat)
{
const GSUB_Feature *feature;
feature = load_GSUB_feature(hdc, psa, psc, feat);
if (!feature)
return GSUB_E_NOFEATURE;
TRACE("applying feature %s\n",feat);
return GSUB_apply_feature(psc->GSUB_Table, 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 void UpdateClusters(int nextIndex, int changeCount, int write_dir, int chars, WORD* pwLogClust )
{
if (changeCount == 0)
return;
else
{
int i;
int target_glyph = nextIndex - 1;
int target_index = -1;
int replacing_glyph = -1;
int changed = 0;
if (write_dir > 0)
for (i = 0; i < chars; i++)
{
if (pwLogClust[i] == target_glyph)
{
target_index = i;
break;
}
}
else
for (i = chars - 1; i >= 0; i--)
{
if (pwLogClust[i] == target_glyph)
{
target_index = i;
break;
}
}
if (target_index == -1)
{
ERR("Unable to find target glyph\n");
return;
}
if (changeCount < 0)
{
/* merge glyphs */
for(i = target_index; i < chars && i >= 0; i+=write_dir)
{
if (pwLogClust[i] == target_glyph)
continue;
if(pwLogClust[i] == replacing_glyph)
pwLogClust[i] = target_glyph;
else
{
changed--;
if (changed >= changeCount)
{
replacing_glyph = pwLogClust[i];
pwLogClust[i] = target_glyph;
}
else
break;
}
}
}
/* renumber trailing indexes*/
for(i = target_index; i < chars && i >= 0; i+=write_dir)
{
if (pwLogClust[i] != target_glyph)
pwLogClust[i] += changeCount;
}
}
}
static int apply_GSUB_feature(HDC hdc, SCRIPT_ANALYSIS *psa, ScriptCache* psc, WORD *pwOutGlyphs, int write_dir, INT* pcGlyphs, INT cChars, const char* feat, WORD *pwLogClust )
{
int i;
if (psc->GSUB_Table)
{
const GSUB_Feature *feature;
feature = load_GSUB_feature(hdc, psa, psc, feat);
if (!feature)
return GSUB_E_NOFEATURE;
i = 0;
TRACE("applying feature %s\n",debugstr_an(feat,4));
while(i < *pcGlyphs)
{
INT nextIndex;
INT prevCount = *pcGlyphs;
nextIndex = GSUB_apply_feature(psc->GSUB_Table, feature, pwOutGlyphs, i, write_dir, pcGlyphs);
if (nextIndex > GSUB_E_NOGLYPH)
{
UpdateClusters(nextIndex, *pcGlyphs - prevCount, write_dir, cChars, pwLogClust);
i = nextIndex;
}
else
i++;
}
return *pcGlyphs;
}
return GSUB_E_NOFEATURE;
}
static WCHAR neighbour_char(int i, int delta, const WCHAR* chars, INT cchLen)
{
if (i + delta < 0)
return 0;
if ( i+ delta >= cchLen)
return 0;
i += delta;
return chars[i];
}
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);
}
static inline BOOL word_break_causing(WCHAR chr)
{
/* we are working within a string of characters already guareented to
be within one script, Syriac, so we do not worry about any characers
other than the space character outside of that range */
return (chr == 0 || chr == 0x20 );
}
/*
* ContextualShape_Arabic
*/
static void ContextualShape_Arabic(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust)
{
CHAR *context_type;
INT *context_shape;
INT dirR, dirL;
int i;
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;
INT prevCount = *pcGlyphs;
nextIndex = apply_GSUB_feature_to_glyph(hdc, psa, psc, pwOutGlyphs, i, dirL, pcGlyphs, contextual_features[context_shape[i]]);
if (nextIndex > GSUB_E_NOGLYPH)
{
i = nextIndex;
UpdateClusters(nextIndex, *pcGlyphs - prevCount, dirL, cChars, pwLogClust);
}
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++;
}
}
HeapFree(GetProcessHeap(),0,context_shape);
HeapFree(GetProcessHeap(),0,context_type);
}
/*
* ContextualShape_Syriac
*/
#define ALAPH 0x710
#define DALATH 0x715
#define RISH 0x72A
static void ContextualShape_Syriac(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust)
{
CHAR *context_type;
INT *context_shape;
INT dirR, dirL;
int i;
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);
if (!psc->GSUB_Table)
return;
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 (pwcChars[i] == ALAPH)
{
WCHAR rchar = neighbour_char(i,dirR,pwcChars,cChars);
if (left_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)) && word_break_causing(neighbour_char(i,dirL,pwcChars,cChars)))
context_shape[i] = Afj;
else if ( rchar != DALATH && rchar != RISH &&
!left_join_causing(neighbour_joining_type(i,dirR,context_type,cChars,psa)) &&
word_break_causing(neighbour_char(i,dirL,pwcChars,cChars)))
context_shape[i] = Afn;
else if ( (rchar == DALATH || rchar == RISH) && word_break_causing(neighbour_char(i,dirL,pwcChars,cChars)))
context_shape[i] = Afx;
}
else 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)
{
INT nextIndex;
INT prevCount = *pcGlyphs;
nextIndex = apply_GSUB_feature_to_glyph(hdc, psa, psc, pwOutGlyphs, i, dirL, pcGlyphs, contextual_features[context_shape[i]]);
if (nextIndex > GSUB_E_NOGLYPH)
{
UpdateClusters(nextIndex, *pcGlyphs - prevCount, dirL, cChars, pwLogClust);
i = nextIndex;
}
}
HeapFree(GetProcessHeap(),0,context_shape);
HeapFree(GetProcessHeap(),0,context_type);
}
/*
* ContextualShape_Phags_pa
*/
#define phags_pa_CANDRABINDU 0xA873
#define phags_pa_START 0xA840
#define phags_pa_END 0xA87F
static void ContextualShape_Phags_pa(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust)
{
INT *context_shape;
INT dirR, dirL;
int i;
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);
if (!psc->GSUB_Table)
return;
context_shape = HeapAlloc(GetProcessHeap(),0,sizeof(INT) * cChars);
for (i = 0; i < cChars; i++)
{
if (pwcChars[i] >= phags_pa_START && pwcChars[i] <= phags_pa_END)
{
WCHAR rchar = neighbour_char(i,dirR,pwcChars,cChars);
WCHAR lchar = neighbour_char(i,dirL,pwcChars,cChars);
BOOL jrchar = (rchar != phags_pa_CANDRABINDU && rchar >= phags_pa_START && rchar <= phags_pa_END);
BOOL jlchar = (lchar != phags_pa_CANDRABINDU && lchar >= phags_pa_START && lchar <= phags_pa_END);
if (jrchar && jlchar)
context_shape[i] = Xm;
else if (jrchar)
context_shape[i] = Xr;
else if (jlchar)
context_shape[i] = Xl;
else
context_shape[i] = Xn;
}
else
context_shape[i] = -1;
}
/* Contextual Shaping */
i = 0;
while(i < *pcGlyphs)
{
if (context_shape[i] >= 0)
{
INT nextIndex;
INT prevCount = *pcGlyphs;
nextIndex = apply_GSUB_feature_to_glyph(hdc, psa, psc, pwOutGlyphs, i, dirL, pcGlyphs, contextual_features[context_shape[i]]);
if (nextIndex > GSUB_E_NOGLYPH)
{
UpdateClusters(nextIndex, *pcGlyphs - prevCount, dirL, cChars, pwLogClust);
i = nextIndex;
}
else
i++;
}
else
i++;
}
HeapFree(GetProcessHeap(),0,context_shape);
}
void SHAPE_ContextualShaping(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WCHAR* pwcChars, INT cChars, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, WORD *pwLogClust)
{
if (ShapingData[psa->eScript].contextProc)
ShapingData[psa->eScript].contextProc(hdc, psc, psa, pwcChars, cChars, pwOutGlyphs, pcGlyphs, cMaxGlyphs, pwLogClust);
}
static void SHAPE_ApplyOpenTypeFeatures(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, INT cChars, const TEXTRANGE_PROPERTIES *rpRangeProperties, WORD *pwLogClust)
{
int i;
INT dirL;
if (!rpRangeProperties)
return;
if (!psc->GSUB_Table)
psc->GSUB_Table = load_gsub_table(hdc);
if (!psc->GSUB_Table)
return;
if (!psa->fLogicalOrder && psa->fRTL)
dirL = -1;
else
dirL = 1;
for (i = 0; i < rpRangeProperties->cotfRecords; i++)
{
if (rpRangeProperties->potfRecords[i].lParameter > 0)
apply_GSUB_feature(hdc, psa, psc, pwOutGlyphs, dirL, pcGlyphs, cChars, (const char*)&rpRangeProperties->potfRecords[i].tagFeature, pwLogClust);
}
}
void SHAPE_ApplyDefaultOpentypeFeatures(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa, WORD* pwOutGlyphs, INT* pcGlyphs, INT cMaxGlyphs, INT cChars, WORD *pwLogClust)
{
const TEXTRANGE_PROPERTIES *rpRangeProperties;
rpRangeProperties = &ShapingData[psa->eScript].defaultTextRange;
SHAPE_ApplyOpenTypeFeatures(hdc, psc, psa, pwOutGlyphs, pcGlyphs, cMaxGlyphs, cChars, rpRangeProperties, pwLogClust);
}
HRESULT SHAPE_CheckFontForRequiredFeatures(HDC hdc, ScriptCache *psc, SCRIPT_ANALYSIS *psa)
{
const GSUB_Feature *feature;
int i;
if (!ShapingData[psa->eScript].requiredFeatures)
return S_OK;
if (!psc->GSUB_Table)
psc->GSUB_Table = load_gsub_table(hdc);
i = 0;
while (ShapingData[psa->eScript].requiredFeatures[i])
{
feature = load_GSUB_feature(hdc, psa, psc, ShapingData[psa->eScript].requiredFeatures[i]);
if (!feature)
return USP_E_SCRIPT_NOT_IN_FONT;
i++;
}
return S_OK;
}
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