1 /*
2 * (C) Copyright IBM Corp. 1998 - 2010 - All Rights Reserved
3 *
4 */
5
6 #include "LETypes.h"
7 #include "LEFontInstance.h"
8 #include "OpenTypeTables.h"
9 #include "ICUFeatures.h"
10 #include "Lookups.h"
11 #include "ScriptAndLanguage.h"
12 #include "GlyphDefinitionTables.h"
13 #include "GlyphPositioningTables.h"
14 #include "SinglePositioningSubtables.h"
15 #include "PairPositioningSubtables.h"
16 #include "CursiveAttachmentSubtables.h"
17 #include "MarkToBasePosnSubtables.h"
18 #include "MarkToLigaturePosnSubtables.h"
19 #include "MarkToMarkPosnSubtables.h"
20 //#include "ContextualPositioningSubtables.h"
21 #include "ContextualSubstSubtables.h"
22 #include "ExtensionSubtables.h"
23 #include "LookupProcessor.h"
24 #include "GlyphPosnLookupProc.h"
25 #include "LESwaps.h"
26
27 U_NAMESPACE_BEGIN
28
29 // Aside from the names, the contextual positioning subtables are
30 // the same as the contextual substitution subtables.
31 typedef ContextualSubstitutionSubtable ContextualPositioningSubtable;
32 typedef ChainingContextualSubstitutionSubtable ChainingContextualPositioningSubtable;
33
GlyphPositioningLookupProcessor(const GlyphPositioningTableHeader * glyphPositioningTableHeader,LETag scriptTag,LETag languageTag,const FeatureMap * featureMap,le_int32 featureMapCount,le_bool featureOrder,LEErrorCode & success)34 GlyphPositioningLookupProcessor::GlyphPositioningLookupProcessor(
35 const GlyphPositioningTableHeader *glyphPositioningTableHeader,
36 LETag scriptTag,
37 LETag languageTag,
38 const FeatureMap *featureMap,
39 le_int32 featureMapCount,
40 le_bool featureOrder,
41 LEErrorCode& success)
42 : LookupProcessor(
43 (char *) glyphPositioningTableHeader,
44 SWAPW(glyphPositioningTableHeader->scriptListOffset),
45 SWAPW(glyphPositioningTableHeader->featureListOffset),
46 SWAPW(glyphPositioningTableHeader->lookupListOffset),
47 scriptTag,
48 languageTag,
49 featureMap,
50 featureMapCount,
51 featureOrder,
52 success
53 )
54 {
55 // anything?
56 }
57
GlyphPositioningLookupProcessor()58 GlyphPositioningLookupProcessor::GlyphPositioningLookupProcessor()
59 {
60 }
61
applySubtable(const LookupSubtable * lookupSubtable,le_uint16 lookupType,GlyphIterator * glyphIterator,const LEFontInstance * fontInstance,LEErrorCode & success) const62 le_uint32 GlyphPositioningLookupProcessor::applySubtable(const LookupSubtable *lookupSubtable, le_uint16 lookupType,
63 GlyphIterator *glyphIterator,
64 const LEFontInstance *fontInstance,
65 LEErrorCode& success) const
66 {
67 if (LE_FAILURE(success)) {
68 return 0;
69 }
70
71 le_uint32 delta = 0;
72
73 switch(lookupType)
74 {
75 case 0:
76 break;
77
78 case gpstSingle:
79 {
80 const SinglePositioningSubtable *subtable = (const SinglePositioningSubtable *) lookupSubtable;
81
82 delta = subtable->process(glyphIterator, fontInstance);
83 break;
84 }
85
86 case gpstPair:
87 {
88 const PairPositioningSubtable *subtable = (const PairPositioningSubtable *) lookupSubtable;
89
90 delta = subtable->process(glyphIterator, fontInstance);
91 break;
92 }
93
94 case gpstCursive:
95 {
96 const CursiveAttachmentSubtable *subtable = (const CursiveAttachmentSubtable *) lookupSubtable;
97
98 delta = subtable->process(glyphIterator, fontInstance);
99 break;
100 }
101
102 case gpstMarkToBase:
103 {
104 const MarkToBasePositioningSubtable *subtable = (const MarkToBasePositioningSubtable *) lookupSubtable;
105
106 delta = subtable->process(glyphIterator, fontInstance);
107 break;
108 }
109
110 case gpstMarkToLigature:
111 {
112 const MarkToLigaturePositioningSubtable *subtable = (const MarkToLigaturePositioningSubtable *) lookupSubtable;
113
114 delta = subtable->process(glyphIterator, fontInstance);
115 break;
116 }
117
118 case gpstMarkToMark:
119 {
120 const MarkToMarkPositioningSubtable *subtable = (const MarkToMarkPositioningSubtable *) lookupSubtable;
121
122 delta = subtable->process(glyphIterator, fontInstance);
123 break;
124 }
125
126 case gpstContext:
127 {
128 const ContextualPositioningSubtable *subtable = (const ContextualPositioningSubtable *) lookupSubtable;
129
130 delta = subtable->process(this, glyphIterator, fontInstance, success);
131 break;
132 }
133
134 case gpstChainedContext:
135 {
136 const ChainingContextualPositioningSubtable *subtable = (const ChainingContextualPositioningSubtable *) lookupSubtable;
137
138 delta = subtable->process(this, glyphIterator, fontInstance, success);
139 break;
140 }
141
142 case gpstExtension:
143 {
144 const ExtensionSubtable *subtable = (const ExtensionSubtable *) lookupSubtable;
145
146 delta = subtable->process(this, lookupType, glyphIterator, fontInstance, success);
147 break;
148 }
149
150 default:
151 break;
152 }
153
154 return delta;
155 }
156
~GlyphPositioningLookupProcessor()157 GlyphPositioningLookupProcessor::~GlyphPositioningLookupProcessor()
158 {
159 }
160
161 U_NAMESPACE_END
162