1 /*
2 *
3 * (C) Copyright IBM Corp. 1998-2013 - All Rights Reserved
4 *
5 */
6
7 #include "LETypes.h"
8 #include "LEFontInstance.h"
9 #include "OpenTypeTables.h"
10 #include "GlyphPositioningTables.h"
11 #include "PairPositioningSubtables.h"
12 #include "ValueRecords.h"
13 #include "GlyphIterator.h"
14 #include "OpenTypeUtilities.h"
15 #include "LESwaps.h"
16
17 U_NAMESPACE_BEGIN
18
process(const LEReferenceTo<PairPositioningSubtable> & base,GlyphIterator * glyphIterator,const LEFontInstance * fontInstance,LEErrorCode & success) const19 le_uint32 PairPositioningSubtable::process(const LEReferenceTo<PairPositioningSubtable> &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
20 {
21 switch(SWAPW(subtableFormat))
22 {
23 case 0:
24 return 0;
25
26 case 1:
27 {
28 const LEReferenceTo<PairPositioningFormat1Subtable> subtable(base, success, (const PairPositioningFormat1Subtable *) this);
29
30 if(LE_SUCCESS(success))
31 return subtable->process(subtable, glyphIterator, fontInstance, success);
32 else
33 return 0;
34 }
35
36 case 2:
37 {
38 const LEReferenceTo<PairPositioningFormat2Subtable> subtable(base, success, (const PairPositioningFormat2Subtable *) this);
39
40 if(LE_SUCCESS(success))
41 return subtable->process(subtable, glyphIterator, fontInstance, success);
42 else
43 return 0;
44 }
45 default:
46 return 0;
47 }
48 }
49
process(const LEReferenceTo<PairPositioningFormat1Subtable> & base,GlyphIterator * glyphIterator,const LEFontInstance * fontInstance,LEErrorCode & success) const50 le_uint32 PairPositioningFormat1Subtable::process(const LEReferenceTo<PairPositioningFormat1Subtable> &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
51 {
52 LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
53 le_int32 coverageIndex = getGlyphCoverage(base, firstGlyph, success);
54 GlyphIterator tempIterator(*glyphIterator);
55
56 if (coverageIndex >= 0 && glyphIterator->next()) {
57 Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);
58 PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);
59 le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);
60 le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
61 le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
62 le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;
63 LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
64 const PairValueRecord *pairValueRecord = NULL;
65
66 if (pairValueCount != 0) {
67 pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);
68 }
69
70 if (pairValueRecord == NULL) {
71 return 0;
72 }
73
74 if (valueFormat1 != 0) {
75 pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
76 }
77
78 if (valueFormat2 != 0) {
79 const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);
80
81 valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);
82 }
83
84 // back up glyphIterator so second glyph can be
85 // first glyph in the next pair
86 glyphIterator->prev();
87 return 1;
88 }
89
90 return 0;
91 }
92
process(const LEReferenceTo<PairPositioningFormat2Subtable> & base,GlyphIterator * glyphIterator,const LEFontInstance * fontInstance,LEErrorCode & success) const93 le_uint32 PairPositioningFormat2Subtable::process(const LEReferenceTo<PairPositioningFormat2Subtable> &base, GlyphIterator *glyphIterator, const LEFontInstance *fontInstance, LEErrorCode &success) const
94 {
95 LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
96 le_int32 coverageIndex = getGlyphCoverage(base, firstGlyph, success);
97 GlyphIterator tempIterator(*glyphIterator);
98
99 if (coverageIndex >= 0 && glyphIterator->next()) {
100 LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
101 const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));
102 const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));
103 le_int32 class1 = classDef1->getGlyphClass(firstGlyph);
104 le_int32 class2 = classDef2->getGlyphClass(secondGlyph);
105 le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
106 le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
107 le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;
108 le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);
109 const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));
110 const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));
111
112
113 if (valueFormat1 != 0) {
114 class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
115 }
116
117 if (valueFormat2 != 0) {
118 const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);
119
120 valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);
121 }
122
123 // back up glyphIterator so second glyph can be
124 // first glyph in the next pair
125 glyphIterator->prev();
126 return 1;
127 }
128
129 return 0;
130 }
131
findPairValueRecord(TTGlyphID glyphID,const PairValueRecord * records,le_uint16 recordCount,le_uint16 recordSize) const132 const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const
133 {
134 #if 1
135 // The OpenType spec. says that the ValueRecord table is
136 // sorted by secondGlyph. Unfortunately, there are fonts
137 // around that have an unsorted ValueRecord table.
138 const PairValueRecord *record = records;
139
140 for(le_int32 r = 0; r < recordCount; r += 1) {
141 if (SWAPW(record->secondGlyph) == glyphID) {
142 return record;
143 }
144
145 record = (const PairValueRecord *) ((char *) record + recordSize);
146 }
147 #else
148 le_uint8 bit = OpenTypeUtilities::highBit(recordCount);
149 le_uint16 power = 1 << bit;
150 le_uint16 extra = (recordCount - power) * recordSize;
151 le_uint16 probe = power * recordSize;
152 const PairValueRecord *record = records;
153 const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);
154
155 if (SWAPW(trial->secondGlyph) <= glyphID) {
156 record = trial;
157 }
158
159 while (probe > recordSize) {
160 probe >>= 1;
161 trial = (const PairValueRecord *) ((char *) record + probe);
162
163 if (SWAPW(trial->secondGlyph) <= glyphID) {
164 record = trial;
165 }
166 }
167
168 if (SWAPW(record->secondGlyph) == glyphID) {
169 return record;
170 }
171 #endif
172
173 return NULL;
174 }
175
176 U_NAMESPACE_END
177