dnsapi: Fix a warning when building on Mingw.
[wine] / dlls / usp10 / opentype.c
1 /*
2  * Opentype font interfaces for the Uniscribe Script Processor (usp10.dll)
3  *
4  * Copyright 2012 CodeWeavers, Aric Stewart
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * This library is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with this library; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
19  *
20  */
21 #include <stdarg.h>
22 #include <stdlib.h>
23
24 #include "windef.h"
25 #include "winbase.h"
26 #include "wingdi.h"
27 #include "winuser.h"
28 #include "winnls.h"
29 #include "usp10.h"
30 #include "winternl.h"
31
32 #include "usp10_internal.h"
33
34 #include "wine/debug.h"
35
36 WINE_DEFAULT_DEBUG_CHANNEL(uniscribe);
37
38 #ifdef WORDS_BIGENDIAN
39 #define GET_BE_WORD(x) (x)
40 #define GET_BE_DWORD(x) (x)
41 #else
42 #define GET_BE_WORD(x) RtlUshortByteSwap(x)
43 #define GET_BE_DWORD(x) RtlUlongByteSwap(x)
44 #endif
45
46 /* These are all structures needed for the cmap format 12 table */
47 #define CMAP_TAG MS_MAKE_TAG('c', 'm', 'a', 'p')
48
49 typedef struct {
50     WORD platformID;
51     WORD encodingID;
52     DWORD offset;
53 } CMAP_EncodingRecord;
54
55 typedef struct {
56     WORD version;
57     WORD numTables;
58     CMAP_EncodingRecord tables[1];
59 } CMAP_Header;
60
61 typedef struct {
62     DWORD startCharCode;
63     DWORD endCharCode;
64     DWORD startGlyphID;
65 } CMAP_SegmentedCoverage_group;
66
67 typedef struct {
68     WORD format;
69     WORD reserved;
70     DWORD length;
71     DWORD language;
72     DWORD nGroups;
73     CMAP_SegmentedCoverage_group groups[1];
74 } CMAP_SegmentedCoverage;
75
76 /* These are all structures needed for the GDEF table */
77 #define GDEF_TAG MS_MAKE_TAG('G', 'D', 'E', 'F')
78
79 enum {BaseGlyph=1, LigatureGlyph, MarkGlyph, ComponentGlyph};
80
81 typedef struct {
82     DWORD Version;
83     WORD GlyphClassDef;
84     WORD AttachList;
85     WORD LigCaretList;
86     WORD MarkAttachClassDef;
87 } GDEF_Header;
88
89 typedef struct {
90     WORD ClassFormat;
91     WORD StartGlyph;
92     WORD GlyphCount;
93     WORD ClassValueArray[1];
94 } GDEF_ClassDefFormat1;
95
96 typedef struct {
97     WORD Start;
98     WORD End;
99     WORD Class;
100 } GDEF_ClassRangeRecord;
101
102 typedef struct {
103     WORD ClassFormat;
104     WORD ClassRangeCount;
105     GDEF_ClassRangeRecord ClassRangeRecord[1];
106 } GDEF_ClassDefFormat2;
107
108 /* These are all structures needed for the GSUB table */
109
110 typedef struct {
111     DWORD version;
112     WORD ScriptList;
113     WORD FeatureList;
114     WORD LookupList;
115 } GSUB_Header;
116
117 typedef struct {
118     CHAR ScriptTag[4];
119     WORD Script;
120 } GSUB_ScriptRecord;
121
122 typedef struct {
123     WORD ScriptCount;
124     GSUB_ScriptRecord ScriptRecord[1];
125 } GSUB_ScriptList;
126
127 typedef struct {
128     CHAR LangSysTag[4];
129     WORD LangSys;
130 } GSUB_LangSysRecord;
131
132 typedef struct {
133     WORD DefaultLangSys;
134     WORD LangSysCount;
135     GSUB_LangSysRecord LangSysRecord[1];
136 } GSUB_Script;
137
138 typedef struct {
139     WORD LookupOrder; /* Reserved */
140     WORD ReqFeatureIndex;
141     WORD FeatureCount;
142     WORD FeatureIndex[1];
143 } GSUB_LangSys;
144
145 typedef struct {
146     CHAR FeatureTag[4];
147     WORD Feature;
148 } GSUB_FeatureRecord;
149
150 typedef struct {
151     WORD FeatureCount;
152     GSUB_FeatureRecord FeatureRecord[1];
153 } GSUB_FeatureList;
154
155 typedef struct {
156     WORD FeatureParams; /* Reserved */
157     WORD LookupCount;
158     WORD LookupListIndex[1];
159 } GSUB_Feature;
160
161 typedef struct {
162     WORD LookupCount;
163     WORD Lookup[1];
164 } GSUB_LookupList;
165
166 typedef struct {
167     WORD LookupType;
168     WORD LookupFlag;
169     WORD SubTableCount;
170     WORD SubTable[1];
171 } GSUB_LookupTable;
172
173 typedef struct {
174     WORD CoverageFormat;
175     WORD GlyphCount;
176     WORD GlyphArray[1];
177 } GSUB_CoverageFormat1;
178
179 typedef struct {
180     WORD Start;
181     WORD End;
182     WORD StartCoverageIndex;
183 } GSUB_RangeRecord;
184
185 typedef struct {
186     WORD CoverageFormat;
187     WORD RangeCount;
188     GSUB_RangeRecord RangeRecord[1];
189 } GSUB_CoverageFormat2;
190
191 typedef struct {
192     WORD SubstFormat; /* = 1 */
193     WORD Coverage;
194     WORD DeltaGlyphID;
195 } GSUB_SingleSubstFormat1;
196
197 typedef struct {
198     WORD SubstFormat; /* = 2 */
199     WORD Coverage;
200     WORD GlyphCount;
201     WORD Substitute[1];
202 }GSUB_SingleSubstFormat2;
203
204 typedef struct {
205     WORD SubstFormat; /* = 1 */
206     WORD Coverage;
207     WORD SequenceCount;
208     WORD Sequence[1];
209 }GSUB_MultipleSubstFormat1;
210
211 typedef struct {
212     WORD GlyphCount;
213     WORD Substitute[1];
214 }GSUB_Sequence;
215
216 typedef struct {
217     WORD SubstFormat; /* = 1 */
218     WORD Coverage;
219     WORD LigSetCount;
220     WORD LigatureSet[1];
221 }GSUB_LigatureSubstFormat1;
222
223 typedef struct {
224     WORD LigatureCount;
225     WORD Ligature[1];
226 }GSUB_LigatureSet;
227
228 typedef struct{
229     WORD LigGlyph;
230     WORD CompCount;
231     WORD Component[1];
232 }GSUB_Ligature;
233
234 typedef struct{
235     WORD SequenceIndex;
236     WORD LookupListIndex;
237
238 }GSUB_SubstLookupRecord;
239
240 typedef struct{
241     WORD SubstFormat; /* = 1 */
242     WORD Coverage;
243     WORD ChainSubRuleSetCount;
244     WORD ChainSubRuleSet[1];
245 }GSUB_ChainContextSubstFormat1;
246
247 typedef struct {
248     WORD SubstFormat; /* = 3 */
249     WORD BacktrackGlyphCount;
250     WORD Coverage[1];
251 }GSUB_ChainContextSubstFormat3_1;
252
253 typedef struct{
254     WORD InputGlyphCount;
255     WORD Coverage[1];
256 }GSUB_ChainContextSubstFormat3_2;
257
258 typedef struct{
259     WORD LookaheadGlyphCount;
260     WORD Coverage[1];
261 }GSUB_ChainContextSubstFormat3_3;
262
263 typedef struct{
264     WORD SubstCount;
265     GSUB_SubstLookupRecord SubstLookupRecord[1];
266 }GSUB_ChainContextSubstFormat3_4;
267
268 typedef struct {
269     WORD SubstFormat; /* = 1 */
270     WORD Coverage;
271     WORD AlternateSetCount;
272     WORD AlternateSet[1];
273 } GSUB_AlternateSubstFormat1;
274
275 typedef struct{
276     WORD GlyphCount;
277     WORD Alternate[1];
278 } GSUB_AlternateSet;
279
280 /**********
281  * CMAP
282  **********/
283
284 static VOID *load_CMAP_format12_table(HDC hdc, ScriptCache *psc)
285 {
286     CMAP_Header *CMAP_Table = NULL;
287     int length;
288     int i;
289
290     if (!psc->CMAP_Table)
291     {
292         length = GetFontData(hdc, CMAP_TAG , 0, NULL, 0);
293         if (length != GDI_ERROR)
294         {
295             psc->CMAP_Table = HeapAlloc(GetProcessHeap(),0,length);
296             GetFontData(hdc, CMAP_TAG , 0, psc->CMAP_Table, length);
297             TRACE("Loaded cmap table of %i bytes\n",length);
298         }
299         else
300             return NULL;
301     }
302
303     CMAP_Table = psc->CMAP_Table;
304
305     for (i = 0; i < GET_BE_WORD(CMAP_Table->numTables); i++)
306     {
307         if ( (GET_BE_WORD(CMAP_Table->tables[i].platformID) == 3) &&
308              (GET_BE_WORD(CMAP_Table->tables[i].encodingID) == 10) )
309         {
310             CMAP_SegmentedCoverage *format = (CMAP_SegmentedCoverage*)(((BYTE*)CMAP_Table) + GET_BE_DWORD(CMAP_Table->tables[i].offset));
311             if (GET_BE_WORD(format->format) == 12)
312                 return format;
313         }
314     }
315     return NULL;
316 }
317
318 static int compare_group(const void *a, const void* b)
319 {
320     const DWORD *chr = a;
321     const CMAP_SegmentedCoverage_group *group = b;
322
323     if (*chr < GET_BE_DWORD(group->startCharCode))
324         return -1;
325     if (*chr > GET_BE_DWORD(group->endCharCode))
326         return 1;
327     return 0;
328 }
329
330 DWORD OpenType_CMAP_GetGlyphIndex(HDC hdc, ScriptCache *psc, DWORD utf32c, LPWORD pgi, DWORD flags)
331 {
332     /* BMP: use gdi32 for ease */
333     if (utf32c < 0x10000)
334     {
335         WCHAR ch = utf32c;
336         return GetGlyphIndicesW(hdc,&ch, 1, pgi, flags);
337     }
338
339     if (!psc->CMAP_format12_Table)
340         psc->CMAP_format12_Table = load_CMAP_format12_table(hdc, psc);
341
342     if (flags & GGI_MARK_NONEXISTING_GLYPHS)
343         *pgi = 0xffff;
344     else
345         *pgi = 0;
346
347     if (psc->CMAP_format12_Table)
348     {
349         CMAP_SegmentedCoverage *format = NULL;
350         CMAP_SegmentedCoverage_group *group = NULL;
351
352         format = (CMAP_SegmentedCoverage *)psc->CMAP_format12_Table;
353
354         group = bsearch(&utf32c, format->groups, GET_BE_DWORD(format->nGroups),
355                         sizeof(CMAP_SegmentedCoverage_group), compare_group);
356
357         if (group)
358         {
359             DWORD offset = utf32c - GET_BE_DWORD(group->startCharCode);
360             *pgi = GET_BE_DWORD(group->startGlyphID) + offset;
361             return 0;
362         }
363     }
364     return 0;
365 }
366
367 /**********
368  * GDEF
369  **********/
370
371 static WORD GDEF_get_glyph_class(const GDEF_Header *header, WORD glyph)
372 {
373     int offset;
374     WORD class = 0;
375     const GDEF_ClassDefFormat1 *cf1;
376
377     if (!header)
378         return 0;
379
380     offset = GET_BE_WORD(header->GlyphClassDef);
381     if (!offset)
382         return 0;
383
384     cf1 = (GDEF_ClassDefFormat1*)(((BYTE*)header)+offset);
385     if (GET_BE_WORD(cf1->ClassFormat) == 1)
386     {
387         if (glyph >= GET_BE_WORD(cf1->StartGlyph))
388         {
389             int index = glyph - GET_BE_WORD(cf1->StartGlyph);
390             if (index < GET_BE_WORD(cf1->GlyphCount))
391                 class = GET_BE_WORD(cf1->ClassValueArray[index]);
392         }
393     }
394     else if (GET_BE_WORD(cf1->ClassFormat) == 2)
395     {
396         const GDEF_ClassDefFormat2 *cf2 = (GDEF_ClassDefFormat2*)cf1;
397         int i, top;
398         top = GET_BE_WORD(cf2->ClassRangeCount);
399         for (i = 0; i < top; i++)
400         {
401             if (glyph >= GET_BE_WORD(cf2->ClassRangeRecord[i].Start) &&
402                 glyph <= GET_BE_WORD(cf2->ClassRangeRecord[i].End))
403             {
404                 class = GET_BE_WORD(cf2->ClassRangeRecord[i].Class);
405                 break;
406             }
407         }
408     }
409     else
410         ERR("Unknown Class Format %i\n",GET_BE_WORD(cf1->ClassFormat));
411
412     return class;
413 }
414
415 static VOID *load_gdef_table(HDC hdc)
416 {
417     VOID* GDEF_Table = NULL;
418     int length = GetFontData(hdc, GDEF_TAG , 0, NULL, 0);
419     if (length != GDI_ERROR)
420     {
421         GDEF_Table = HeapAlloc(GetProcessHeap(),0,length);
422         GetFontData(hdc, GDEF_TAG , 0, GDEF_Table, length);
423         TRACE("Loaded GDEF table of %i bytes\n",length);
424     }
425     return GDEF_Table;
426 }
427
428 void OpenType_GDEF_UpdateGlyphProps(HDC hdc, ScriptCache *psc, const WORD *pwGlyphs, const WORD cGlyphs, WORD* pwLogClust, const WORD cChars, SCRIPT_GLYPHPROP *pGlyphProp)
429 {
430     int i;
431
432     if (!psc->GDEF_Table)
433         psc->GDEF_Table = load_gdef_table(hdc);
434
435     for (i = 0; i < cGlyphs; i++)
436     {
437         WORD class;
438         int char_count = 0;
439         int k;
440
441         for (k = 0; k < cChars; k++)
442             if (pwLogClust[k] == i)
443                 char_count++;
444
445         class = GDEF_get_glyph_class(psc->GDEF_Table, pwGlyphs[i]);
446
447         switch (class)
448         {
449             case 0:
450             case BaseGlyph:
451                 pGlyphProp[i].sva.fClusterStart = 1;
452                 pGlyphProp[i].sva.fDiacritic = 0;
453                 pGlyphProp[i].sva.fZeroWidth = 0;
454                 break;
455             case LigatureGlyph:
456                 pGlyphProp[i].sva.fClusterStart = 1;
457                 pGlyphProp[i].sva.fDiacritic = 0;
458                 pGlyphProp[i].sva.fZeroWidth = 0;
459                 break;
460             case MarkGlyph:
461                 pGlyphProp[i].sva.fClusterStart = 0;
462                 pGlyphProp[i].sva.fDiacritic = 1;
463                 pGlyphProp[i].sva.fZeroWidth = 1;
464                 break;
465             case ComponentGlyph:
466                 pGlyphProp[i].sva.fClusterStart = 0;
467                 pGlyphProp[i].sva.fDiacritic = 0;
468                 pGlyphProp[i].sva.fZeroWidth = 0;
469                 break;
470             default:
471                 ERR("Unknown glyph class %i\n",class);
472                 pGlyphProp[i].sva.fClusterStart = 1;
473                 pGlyphProp[i].sva.fDiacritic = 0;
474                 pGlyphProp[i].sva.fZeroWidth = 0;
475         }
476
477         if (char_count == 0)
478             pGlyphProp[i].sva.fClusterStart = 0;
479     }
480 }
481
482 /**********
483  * GSUB
484  **********/
485 static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count);
486
487 static INT GSUB_is_glyph_covered(LPCVOID table , UINT glyph)
488 {
489     const GSUB_CoverageFormat1* cf1;
490
491     cf1 = table;
492
493     if (GET_BE_WORD(cf1->CoverageFormat) == 1)
494     {
495         int count = GET_BE_WORD(cf1->GlyphCount);
496         int i;
497         TRACE("Coverage Format 1, %i glyphs\n",count);
498         for (i = 0; i < count; i++)
499             if (glyph == GET_BE_WORD(cf1->GlyphArray[i]))
500                 return i;
501         return -1;
502     }
503     else if (GET_BE_WORD(cf1->CoverageFormat) == 2)
504     {
505         const GSUB_CoverageFormat2* cf2;
506         int i;
507         int count;
508         cf2 = (const GSUB_CoverageFormat2*)cf1;
509
510         count = GET_BE_WORD(cf2->RangeCount);
511         TRACE("Coverage Format 2, %i ranges\n",count);
512         for (i = 0; i < count; i++)
513         {
514             if (glyph < GET_BE_WORD(cf2->RangeRecord[i].Start))
515                 return -1;
516             if ((glyph >= GET_BE_WORD(cf2->RangeRecord[i].Start)) &&
517                 (glyph <= GET_BE_WORD(cf2->RangeRecord[i].End)))
518             {
519                 return (GET_BE_WORD(cf2->RangeRecord[i].StartCoverageIndex) +
520                     glyph - GET_BE_WORD(cf2->RangeRecord[i].Start));
521             }
522         }
523         return -1;
524     }
525     else
526         ERR("Unknown CoverageFormat %i\n",GET_BE_WORD(cf1->CoverageFormat));
527
528     return -1;
529 }
530
531 static INT GSUB_apply_SingleSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
532 {
533     int j;
534     TRACE("Single Substitution Subtable\n");
535
536     for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
537     {
538         int offset;
539         const GSUB_SingleSubstFormat1 *ssf1;
540         offset = GET_BE_WORD(look->SubTable[j]);
541         ssf1 = (const GSUB_SingleSubstFormat1*)((const BYTE*)look+offset);
542         if (GET_BE_WORD(ssf1->SubstFormat) == 1)
543         {
544             int offset = GET_BE_WORD(ssf1->Coverage);
545             TRACE("  subtype 1, delta %i\n", GET_BE_WORD(ssf1->DeltaGlyphID));
546             if (GSUB_is_glyph_covered((const BYTE*)ssf1+offset, glyphs[glyph_index]) != -1)
547             {
548                 TRACE("  Glyph 0x%x ->",glyphs[glyph_index]);
549                 glyphs[glyph_index] = glyphs[glyph_index] + GET_BE_WORD(ssf1->DeltaGlyphID);
550                 TRACE(" 0x%x\n",glyphs[glyph_index]);
551                 return glyph_index + write_dir;
552             }
553         }
554         else
555         {
556             const GSUB_SingleSubstFormat2 *ssf2;
557             INT index;
558             INT offset;
559
560             ssf2 = (const GSUB_SingleSubstFormat2 *)ssf1;
561             offset = GET_BE_WORD(ssf1->Coverage);
562             TRACE("  subtype 2,  glyph count %i\n", GET_BE_WORD(ssf2->GlyphCount));
563             index = GSUB_is_glyph_covered((const BYTE*)ssf2+offset, glyphs[glyph_index]);
564             TRACE("  Coverage index %i\n",index);
565             if (index != -1)
566             {
567                 if (glyphs[glyph_index] == GET_BE_WORD(ssf2->Substitute[index]))
568                     return GSUB_E_NOGLYPH;
569
570                 TRACE("    Glyph is 0x%x ->",glyphs[glyph_index]);
571                 glyphs[glyph_index] = GET_BE_WORD(ssf2->Substitute[index]);
572                 TRACE("0x%x\n",glyphs[glyph_index]);
573                 return glyph_index + write_dir;
574             }
575         }
576     }
577     return GSUB_E_NOGLYPH;
578 }
579
580 static INT GSUB_apply_MultipleSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
581 {
582     int j;
583     TRACE("Multiple Substitution Subtable\n");
584
585     for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
586     {
587         int offset, index;
588         const GSUB_MultipleSubstFormat1 *msf1;
589         offset = GET_BE_WORD(look->SubTable[j]);
590         msf1 = (const GSUB_MultipleSubstFormat1*)((const BYTE*)look+offset);
591
592         offset = GET_BE_WORD(msf1->Coverage);
593         index = GSUB_is_glyph_covered((const BYTE*)msf1+offset, glyphs[glyph_index]);
594         if (index != -1)
595         {
596             const GSUB_Sequence *seq;
597             int sub_count;
598             int j;
599             offset = GET_BE_WORD(msf1->Sequence[index]);
600             seq = (const GSUB_Sequence*)((const BYTE*)msf1+offset);
601             sub_count = GET_BE_WORD(seq->GlyphCount);
602             TRACE("  Glyph 0x%x (+%i)->",glyphs[glyph_index],(sub_count-1));
603
604             for (j = (*glyph_count)+(sub_count-1); j > glyph_index; j--)
605                     glyphs[j] =glyphs[j-(sub_count-1)];
606
607             for (j = 0; j < sub_count; j++)
608                     if (write_dir < 0)
609                         glyphs[glyph_index + (sub_count-1) - j] = GET_BE_WORD(seq->Substitute[j]);
610                     else
611                         glyphs[glyph_index + j] = GET_BE_WORD(seq->Substitute[j]);
612
613             *glyph_count = *glyph_count + (sub_count - 1);
614
615             if (TRACE_ON(uniscribe))
616             {
617                 for (j = 0; j < sub_count; j++)
618                     TRACE(" 0x%x",glyphs[glyph_index+j]);
619                 TRACE("\n");
620             }
621
622             return glyph_index + (sub_count * write_dir);
623         }
624     }
625     return GSUB_E_NOGLYPH;
626 }
627
628 static INT GSUB_apply_AlternateSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
629 {
630     int j;
631     TRACE("Alternate Substitution Subtable\n");
632
633     for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
634     {
635         int offset;
636         const GSUB_AlternateSubstFormat1 *asf1;
637         INT index;
638
639         offset = GET_BE_WORD(look->SubTable[j]);
640         asf1 = (const GSUB_AlternateSubstFormat1*)((const BYTE*)look+offset);
641         offset = GET_BE_WORD(asf1->Coverage);
642
643         index = GSUB_is_glyph_covered((const BYTE*)asf1+offset, glyphs[glyph_index]);
644         if (index != -1)
645         {
646             const GSUB_AlternateSet *as;
647             offset =  GET_BE_WORD(asf1->AlternateSet[index]);
648             as = (const GSUB_AlternateSet*)((const BYTE*)asf1+offset);
649             FIXME("%i alternates, picking index 0\n",GET_BE_WORD(as->GlyphCount));
650             if (glyphs[glyph_index] == GET_BE_WORD(as->Alternate[0]))
651                 return GSUB_E_NOGLYPH;
652
653             TRACE("  Glyph 0x%x ->",glyphs[glyph_index]);
654             glyphs[glyph_index] = GET_BE_WORD(as->Alternate[0]);
655             TRACE(" 0x%x\n",glyphs[glyph_index]);
656             return glyph_index + write_dir;
657         }
658     }
659     return GSUB_E_NOGLYPH;
660 }
661
662 static INT GSUB_apply_LigatureSubst(const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
663 {
664     int j;
665
666     TRACE("Ligature Substitution Subtable\n");
667     for (j = 0; j < GET_BE_WORD(look->SubTableCount); j++)
668     {
669         const GSUB_LigatureSubstFormat1 *lsf1;
670         int offset,index;
671
672         offset = GET_BE_WORD(look->SubTable[j]);
673         lsf1 = (const GSUB_LigatureSubstFormat1*)((const BYTE*)look+offset);
674         offset = GET_BE_WORD(lsf1->Coverage);
675         index = GSUB_is_glyph_covered((const BYTE*)lsf1+offset, glyphs[glyph_index]);
676         TRACE("  Coverage index %i\n",index);
677         if (index != -1)
678         {
679             const GSUB_LigatureSet *ls;
680             int k, count;
681
682             offset = GET_BE_WORD(lsf1->LigatureSet[index]);
683             ls = (const GSUB_LigatureSet*)((const BYTE*)lsf1+offset);
684             count = GET_BE_WORD(ls->LigatureCount);
685             TRACE("  LigatureSet has %i members\n",count);
686             for (k = 0; k < count; k++)
687             {
688                 const GSUB_Ligature *lig;
689                 int CompCount,l,CompIndex;
690
691                 offset = GET_BE_WORD(ls->Ligature[k]);
692                 lig = (const GSUB_Ligature*)((const BYTE*)ls+offset);
693                 CompCount = GET_BE_WORD(lig->CompCount) - 1;
694                 CompIndex = glyph_index+write_dir;
695                 for (l = 0; l < CompCount && CompIndex >= 0 && CompIndex < *glyph_count; l++)
696                 {
697                     int CompGlyph;
698                     CompGlyph = GET_BE_WORD(lig->Component[l]);
699                     if (CompGlyph != glyphs[CompIndex])
700                         break;
701                     CompIndex += write_dir;
702                 }
703                 if (l == CompCount)
704                 {
705                     int replaceIdx = glyph_index;
706                     if (write_dir < 0)
707                         replaceIdx = glyph_index - CompCount;
708
709                     TRACE("    Glyph is 0x%x (+%i) ->",glyphs[glyph_index],CompCount);
710                     glyphs[replaceIdx] = GET_BE_WORD(lig->LigGlyph);
711                     TRACE("0x%x\n",glyphs[replaceIdx]);
712                     if (CompCount > 0)
713                     {
714                         int j;
715                         for (j = replaceIdx + 1; j < *glyph_count; j++)
716                             glyphs[j] =glyphs[j+CompCount];
717                         *glyph_count = *glyph_count - CompCount;
718                     }
719                     return replaceIdx + write_dir;
720                 }
721             }
722         }
723     }
724     return GSUB_E_NOGLYPH;
725 }
726
727 static INT GSUB_apply_ChainContextSubst(const GSUB_LookupList* lookup, const GSUB_LookupTable *look, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
728 {
729     int j;
730     BOOL done = FALSE;
731
732     TRACE("Chaining Contextual Substitution Subtable\n");
733     for (j = 0; j < GET_BE_WORD(look->SubTableCount) && !done; j++)
734     {
735         const GSUB_ChainContextSubstFormat1 *ccsf1;
736         int offset;
737         int dirLookahead = write_dir;
738         int dirBacktrack = -1 * write_dir;
739
740         offset = GET_BE_WORD(look->SubTable[j]);
741         ccsf1 = (const GSUB_ChainContextSubstFormat1*)((const BYTE*)look+offset);
742         if (GET_BE_WORD(ccsf1->SubstFormat) == 1)
743         {
744             FIXME("  TODO: subtype 1 (Simple context glyph substitution)\n");
745             continue;
746         }
747         else if (GET_BE_WORD(ccsf1->SubstFormat) == 2)
748         {
749             FIXME("  TODO: subtype 2 (Class-based Chaining Context Glyph Substitution)\n");
750             continue;
751         }
752         else if (GET_BE_WORD(ccsf1->SubstFormat) == 3)
753         {
754             int k;
755             int indexGlyphs;
756             const GSUB_ChainContextSubstFormat3_1 *ccsf3_1;
757             const GSUB_ChainContextSubstFormat3_2 *ccsf3_2;
758             const GSUB_ChainContextSubstFormat3_3 *ccsf3_3;
759             const GSUB_ChainContextSubstFormat3_4 *ccsf3_4;
760             int newIndex = glyph_index;
761
762             ccsf3_1 = (const GSUB_ChainContextSubstFormat3_1 *)ccsf1;
763
764             TRACE("  subtype 3 (Coverage-based Chaining Context Glyph Substitution)\n");
765
766             for (k = 0; k < GET_BE_WORD(ccsf3_1->BacktrackGlyphCount); k++)
767             {
768                 offset = GET_BE_WORD(ccsf3_1->Coverage[k]);
769                 if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirBacktrack * (k+1))]) == -1)
770                     break;
771             }
772             if (k != GET_BE_WORD(ccsf3_1->BacktrackGlyphCount))
773                 continue;
774             TRACE("Matched Backtrack\n");
775
776             ccsf3_2 = (const GSUB_ChainContextSubstFormat3_2 *)(((LPBYTE)ccsf1)+sizeof(GSUB_ChainContextSubstFormat3_1) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_1->BacktrackGlyphCount)-1)));
777
778             indexGlyphs = GET_BE_WORD(ccsf3_2->InputGlyphCount);
779             for (k = 0; k < indexGlyphs; k++)
780             {
781                 offset = GET_BE_WORD(ccsf3_2->Coverage[k]);
782                 if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (write_dir * k)]) == -1)
783                     break;
784             }
785             if (k != indexGlyphs)
786                 continue;
787             TRACE("Matched IndexGlyphs\n");
788
789             ccsf3_3 = (const GSUB_ChainContextSubstFormat3_3 *)(((LPBYTE)ccsf3_2)+sizeof(GSUB_ChainContextSubstFormat3_2) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_2->InputGlyphCount)-1)));
790
791             for (k = 0; k < GET_BE_WORD(ccsf3_3->LookaheadGlyphCount); k++)
792             {
793                 offset = GET_BE_WORD(ccsf3_3->Coverage[k]);
794                 if (GSUB_is_glyph_covered((const BYTE*)ccsf3_1+offset, glyphs[glyph_index + (dirLookahead * (indexGlyphs + k))]) == -1)
795                     break;
796             }
797             if (k != GET_BE_WORD(ccsf3_3->LookaheadGlyphCount))
798                 continue;
799             TRACE("Matched LookAhead\n");
800
801             ccsf3_4 = (const GSUB_ChainContextSubstFormat3_4 *)(((LPBYTE)ccsf3_3)+sizeof(GSUB_ChainContextSubstFormat3_3) + (sizeof(WORD) * (GET_BE_WORD(ccsf3_3->LookaheadGlyphCount)-1)));
802
803             if (GET_BE_WORD(ccsf3_4->SubstCount))
804             {
805                 for (k = 0; k < GET_BE_WORD(ccsf3_4->SubstCount); k++)
806                 {
807                     int lookupIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].LookupListIndex);
808                     int SequenceIndex = GET_BE_WORD(ccsf3_4->SubstLookupRecord[k].SequenceIndex) * write_dir;
809
810                     TRACE("SUBST: %i -> %i %i\n",k, SequenceIndex, lookupIndex);
811                     newIndex = GSUB_apply_lookup(lookup, lookupIndex, glyphs, glyph_index + SequenceIndex, write_dir, glyph_count);
812                     if (newIndex == -1)
813                     {
814                         ERR("Chain failed to generate a glyph\n");
815                         continue;
816                     }
817                 }
818                 return newIndex;
819             }
820             else return GSUB_E_NOGLYPH;
821         }
822     }
823     return -1;
824 }
825
826 static INT GSUB_apply_lookup(const GSUB_LookupList* lookup, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
827 {
828     int offset;
829     const GSUB_LookupTable *look;
830
831     offset = GET_BE_WORD(lookup->Lookup[lookup_index]);
832     look = (const GSUB_LookupTable*)((const BYTE*)lookup + offset);
833     TRACE("type %i, flag %x, subtables %i\n",GET_BE_WORD(look->LookupType),GET_BE_WORD(look->LookupFlag),GET_BE_WORD(look->SubTableCount));
834     switch(GET_BE_WORD(look->LookupType))
835     {
836         case 1:
837             return GSUB_apply_SingleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
838         case 2:
839             return GSUB_apply_MultipleSubst(look, glyphs, glyph_index, write_dir, glyph_count);
840         case 3:
841             return GSUB_apply_AlternateSubst(look, glyphs, glyph_index, write_dir, glyph_count);
842         case 4:
843             return GSUB_apply_LigatureSubst(look, glyphs, glyph_index, write_dir, glyph_count);
844         case 6:
845             return GSUB_apply_ChainContextSubst(lookup, look, glyphs, glyph_index, write_dir, glyph_count);
846         default:
847             FIXME("We do not handle SubType %i\n",GET_BE_WORD(look->LookupType));
848     }
849     return GSUB_E_NOGLYPH;
850 }
851
852 INT OpenType_apply_GSUB_lookup(LPCVOID table, INT lookup_index, WORD *glyphs, INT glyph_index, INT write_dir, INT *glyph_count)
853 {
854     const GSUB_Header *header = (const GSUB_Header *)table;
855     const GSUB_LookupList *lookup = (const GSUB_LookupList*)((const BYTE*)header + GET_BE_WORD(header->LookupList));
856
857     return GSUB_apply_lookup(lookup, lookup_index, glyphs, glyph_index, write_dir, glyph_count);
858 }
859
860 static void GSUB_initialize_script_cache(ScriptCache *psc)
861 {
862     int i;
863
864     if (!psc->script_count)
865     {
866         const GSUB_ScriptList *script;
867         const GSUB_Header* header = (const GSUB_Header*)psc->GSUB_Table;
868         script = (const GSUB_ScriptList*)((const BYTE*)header + GET_BE_WORD(header->ScriptList));
869         psc->script_count = GET_BE_WORD(script->ScriptCount);
870         TRACE("initializing %i scripts in this font\n",psc->script_count);
871         psc->scripts = HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,sizeof(LoadedScript) * psc->script_count);
872         for (i = 0; i < psc->script_count; i++)
873         {
874             int offset = GET_BE_WORD(script->ScriptRecord[i].Script);
875             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]);
876             psc->scripts[i].table = ((const BYTE*)script + offset);
877         }
878     }
879 }
880
881 HRESULT OpenType_GSUB_GetFontScriptTags(ScriptCache *psc, OPENTYPE_TAG searchingFor, int cMaxTags, OPENTYPE_TAG *pScriptTags, int *pcTags, LPCVOID* script_table)
882 {
883     int i;
884     HRESULT rc = S_OK;
885
886     GSUB_initialize_script_cache(psc);
887     *pcTags = psc->script_count;
888
889     if (!searchingFor && cMaxTags < *pcTags)
890         rc = E_OUTOFMEMORY;
891     else if (searchingFor)
892         rc = USP_E_SCRIPT_NOT_IN_FONT;
893
894     for (i = 0; i < psc->script_count; i++)
895     {
896         if (i < cMaxTags)
897             pScriptTags[i] = psc->scripts[i].tag;
898
899         if (searchingFor)
900         {
901             if (searchingFor == psc->scripts[i].tag)
902             {
903                 pScriptTags[0] = psc->scripts[i].tag;
904                 *pcTags = 1;
905                 if (script_table)
906                     *script_table = psc->scripts[i].table;
907                 rc = S_OK;
908                 break;
909             }
910         }
911     }
912     return rc;
913 }
914
915 static void GSUB_initialize_language_cache(LoadedScript *script)
916 {
917     int i;
918
919     if (!script->language_count)
920     {
921         const GSUB_Script* table = script->table;
922         script->language_count = GET_BE_WORD(table->LangSysCount);
923         script->default_language.tag = MS_MAKE_TAG('d','f','l','t');
924         script->default_language.table = (const BYTE*)table + GET_BE_WORD(table->DefaultLangSys);
925
926         TRACE("Deflang %p, LangCount %i\n",script->default_language.table, script->language_count);
927
928         script->languages = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, sizeof(LoadedLanguage) * script->language_count);
929
930         for (i = 0; i < script->language_count; i++)
931         {
932             int offset = GET_BE_WORD(table->LangSysRecord[i].LangSys);
933             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]);
934             script->languages[i].table = ((const BYTE*)table + offset);
935         }
936     }
937 }
938
939 HRESULT OpenType_GSUB_GetFontLanguageTags(ScriptCache *psc, OPENTYPE_TAG script_tag, OPENTYPE_TAG searchingFor, int cMaxTags, OPENTYPE_TAG *pLanguageTags, int *pcTags, LPCVOID* language_table)
940 {
941     int i;
942     HRESULT rc = S_OK;
943     LoadedScript *script = NULL;
944
945     GSUB_initialize_script_cache(psc);
946
947     for (i = 0; i < psc->script_count; i++)
948     {
949          if (psc->scripts[i].tag == script_tag)
950          {
951             script = &psc->scripts[i];
952             break;
953          }
954     }
955
956     if (!script)
957         return E_INVALIDARG;
958
959     GSUB_initialize_language_cache(script);
960
961     if (!searchingFor && cMaxTags < script->language_count)
962         rc = E_OUTOFMEMORY;
963     else if (searchingFor)
964         rc = E_INVALIDARG;
965
966     *pcTags = script->language_count;
967
968     for (i = 0; i < script->language_count; i++)
969     {
970         if (i < cMaxTags)
971             pLanguageTags[i] = script->languages[i].tag;
972
973         if (searchingFor)
974         {
975             if (searchingFor == script->languages[i].tag)
976             {
977                 pLanguageTags[0] = script->languages[i].tag;
978                 *pcTags = 1;
979                 if (language_table)
980                     *language_table = script->languages[i].table;
981                 rc = S_OK;
982                 break;
983             }
984         }
985     }
986
987     if (script->default_language.table)
988     {
989         if (i < cMaxTags)
990             pLanguageTags[i] = script->default_language.tag;
991
992         if (searchingFor  && FAILED(rc))
993         {
994             pLanguageTags[0] = script->default_language.tag;
995             if (language_table)
996                 *language_table = script->default_language.table;
997         }
998         i++;
999         *pcTags = (*pcTags) + 1;
1000     }
1001
1002     return rc;
1003 }
1004
1005
1006 static void GSUB_initialize_feature_cache(LPCVOID table, LoadedLanguage *language)
1007 {
1008     int i;
1009
1010     if (!language->feature_count)
1011     {
1012         const GSUB_LangSys *lang= language->table;
1013         const GSUB_Header *header = (const GSUB_Header *)table;
1014         const GSUB_FeatureList *feature_list;
1015
1016         language->feature_count = GET_BE_WORD(lang->FeatureCount);
1017         TRACE("%i features\n",language->feature_count);
1018
1019         language->features = HeapAlloc(GetProcessHeap(),0,sizeof(LoadedFeature)*language->feature_count);
1020
1021         feature_list = (const GSUB_FeatureList*)((const BYTE*)header + GET_BE_WORD(header->FeatureList));
1022
1023         for (i = 0; i < language->feature_count; i++)
1024         {
1025             const GSUB_Feature *feature;
1026             int j;
1027             int index = GET_BE_WORD(lang->FeatureIndex[i]);
1028
1029             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]);
1030             language->features[i].feature = ((const BYTE*)feature_list + GET_BE_WORD(feature_list->FeatureRecord[index].Feature));
1031             feature = (const GSUB_Feature*)language->features[i].feature;
1032             language->features[i].lookup_count = GET_BE_WORD(feature->LookupCount);
1033             language->features[i].lookups = HeapAlloc(GetProcessHeap(),0,sizeof(WORD) * language->features[i].lookup_count);
1034             for (j = 0; j < language->features[i].lookup_count; j++)
1035                 language->features[i].lookups[j] = GET_BE_WORD(feature->LookupListIndex[j]);
1036         }
1037     }
1038 }
1039
1040 HRESULT OpenType_GSUB_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)
1041 {
1042     int i;
1043     HRESULT rc = S_OK;
1044     LoadedScript *script = NULL;
1045     LoadedLanguage *language = NULL;
1046
1047     GSUB_initialize_script_cache(psc);
1048
1049     for (i = 0; i < psc->script_count; i++)
1050     {
1051         if (psc->scripts[i].tag == script_tag)
1052         {
1053             script = &psc->scripts[i];
1054             break;
1055         }
1056     }
1057
1058     if (!script)
1059     {
1060         *pcTags = 0;
1061         if (!filtered)
1062             return S_OK;
1063         else
1064             return E_INVALIDARG;
1065     }
1066
1067     GSUB_initialize_language_cache(script);
1068
1069     if (script->default_language.table && script->default_language.tag == language_tag)
1070         language = &script->default_language;
1071     else
1072     {
1073         for (i = 0; i < script->language_count; i++)
1074         {
1075             if (script->languages[i].tag == language_tag)
1076             {
1077                 language = &script->languages[i];
1078                 break;
1079             }
1080         }
1081     }
1082
1083     if (!language)
1084     {
1085         *pcTags = 0;
1086         return S_OK;
1087     }
1088
1089     GSUB_initialize_feature_cache(psc->GSUB_Table, language);
1090
1091     *pcTags = language->feature_count;
1092
1093     if (!searchingFor && cMaxTags < *pcTags)
1094         rc = E_OUTOFMEMORY;
1095     else if (searchingFor)
1096         rc = E_INVALIDARG;
1097
1098     for (i = 0; i < language->feature_count; i++)
1099     {
1100         if (i < cMaxTags)
1101             pFeatureTags[i] = language->features[i].tag;
1102
1103         if (searchingFor)
1104         {
1105             if (searchingFor == language->features[i].tag)
1106             {
1107                 pFeatureTags[0] = language->features[i].tag;
1108                 *pcTags = 1;
1109                 if (feature)
1110                     *feature = &language->features[i];
1111                 rc = S_OK;
1112                 break;
1113             }
1114         }
1115     }
1116     return rc;
1117 }