1 /*
2 *
3 * (C) Copyright IBM Corp. 1998-2006 - 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(GlyphIterator * glyphIterator,const LEFontInstance * fontInstance) const19 le_uint32 PairPositioningSubtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
20 {
21 switch(SWAPW(subtableFormat))
22 {
23 case 0:
24 return 0;
25
26 case 1:
27 {
28 const PairPositioningFormat1Subtable *subtable = (const PairPositioningFormat1Subtable *) this;
29
30 return subtable->process(glyphIterator, fontInstance);
31 }
32
33 case 2:
34 {
35 const PairPositioningFormat2Subtable *subtable = (const PairPositioningFormat2Subtable *) this;
36
37 return subtable->process(glyphIterator, fontInstance);
38 }
39
40 default:
41 return 0;
42 }
43 }
44
process(GlyphIterator * glyphIterator,const LEFontInstance * fontInstance) const45 le_uint32 PairPositioningFormat1Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
46 {
47 LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
48 le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
49 GlyphIterator tempIterator(*glyphIterator);
50
51 if (coverageIndex >= 0 && glyphIterator->next()) {
52 Offset pairSetTableOffset = SWAPW(pairSetTableOffsetArray[coverageIndex]);
53 PairSetTable *pairSetTable = (PairSetTable *) ((char *) this + pairSetTableOffset);
54 le_uint16 pairValueCount = SWAPW(pairSetTable->pairValueCount);
55 le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
56 le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
57 le_int16 recordSize = sizeof(PairValueRecord) - sizeof(ValueRecord) + valueRecord1Size + valueRecord2Size;
58 LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
59 const PairValueRecord *pairValueRecord = NULL;
60
61 if (pairValueCount != 0) {
62 pairValueRecord = findPairValueRecord((TTGlyphID) LE_GET_GLYPH(secondGlyph), pairSetTable->pairValueRecordArray, pairValueCount, recordSize);
63 }
64
65 if (pairValueRecord == NULL) {
66 return 0;
67 }
68
69 if (valueFormat1 != 0) {
70 pairValueRecord->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
71 }
72
73 if (valueFormat2 != 0) {
74 const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &pairValueRecord->valueRecord1 + valueRecord1Size);
75
76 valueRecord2->adjustPosition(SWAPW(valueFormat2), (char *) this, *glyphIterator, fontInstance);
77 }
78
79 // back up glyphIterator so second glyph can be
80 // first glyph in the next pair
81 glyphIterator->prev();
82 return 1;
83 }
84
85 return 0;
86 }
87
process(GlyphIterator * glyphIterator,const LEFontInstance * fontInstance) const88 le_uint32 PairPositioningFormat2Subtable::process(GlyphIterator *glyphIterator, const LEFontInstance *fontInstance) const
89 {
90 LEGlyphID firstGlyph = glyphIterator->getCurrGlyphID();
91 le_int32 coverageIndex = getGlyphCoverage(firstGlyph);
92 GlyphIterator tempIterator(*glyphIterator);
93
94 if (coverageIndex >= 0 && glyphIterator->next()) {
95 LEGlyphID secondGlyph = glyphIterator->getCurrGlyphID();
96 const ClassDefinitionTable *classDef1 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef1Offset));
97 const ClassDefinitionTable *classDef2 = (const ClassDefinitionTable *) ((char *) this + SWAPW(classDef2Offset));
98 le_int32 class1 = classDef1->getGlyphClass(firstGlyph);
99 le_int32 class2 = classDef2->getGlyphClass(secondGlyph);
100 le_int16 valueRecord1Size = ValueRecord::getSize(SWAPW(valueFormat1));
101 le_int16 valueRecord2Size = ValueRecord::getSize(SWAPW(valueFormat2));
102 le_int16 class2RecordSize = valueRecord1Size + valueRecord2Size;
103 le_int16 class1RecordSize = class2RecordSize * SWAPW(class2Count);
104 const Class1Record *class1Record = (const Class1Record *) ((char *) class1RecordArray + (class1RecordSize * class1));
105 const Class2Record *class2Record = (const Class2Record *) ((char *) class1Record->class2RecordArray + (class2RecordSize * class2));
106
107
108 if (valueFormat1 != 0) {
109 class2Record->valueRecord1.adjustPosition(SWAPW(valueFormat1), (char *) this, tempIterator, fontInstance);
110 }
111
112 if (valueFormat2 != 0) {
113 const ValueRecord *valueRecord2 = (const ValueRecord *) ((char *) &class2Record->valueRecord1 + valueRecord1Size);
114
115 valueRecord2->adjustPosition(SWAPW(valueFormat2), (const char *) this, *glyphIterator, fontInstance);
116 }
117
118 // back up glyphIterator so second glyph can be
119 // first glyph in the next pair
120 glyphIterator->prev();
121 return 1;
122 }
123
124 return 0;
125 }
126
findPairValueRecord(TTGlyphID glyphID,const PairValueRecord * records,le_uint16 recordCount,le_uint16 recordSize) const127 const PairValueRecord *PairPositioningFormat1Subtable::findPairValueRecord(TTGlyphID glyphID, const PairValueRecord *records, le_uint16 recordCount, le_uint16 recordSize) const
128 {
129 #if 1
130 // The OpenType spec. says that the ValueRecord table is
131 // sorted by secondGlyph. Unfortunately, there are fonts
132 // around that have an unsorted ValueRecord table.
133 const PairValueRecord *record = records;
134
135 for(le_int32 r = 0; r < recordCount; r += 1) {
136 if (SWAPW(record->secondGlyph) == glyphID) {
137 return record;
138 }
139
140 record = (const PairValueRecord *) ((char *) record + recordSize);
141 }
142 #else
143 le_uint8 bit = OpenTypeUtilities::highBit(recordCount);
144 le_uint16 power = 1 << bit;
145 le_uint16 extra = (recordCount - power) * recordSize;
146 le_uint16 probe = power * recordSize;
147 const PairValueRecord *record = records;
148 const PairValueRecord *trial = (const PairValueRecord *) ((char *) record + extra);
149
150 if (SWAPW(trial->secondGlyph) <= glyphID) {
151 record = trial;
152 }
153
154 while (probe > recordSize) {
155 probe >>= 1;
156 trial = (const PairValueRecord *) ((char *) record + probe);
157
158 if (SWAPW(trial->secondGlyph) <= glyphID) {
159 record = trial;
160 }
161 }
162
163 if (SWAPW(record->secondGlyph) == glyphID) {
164 return record;
165 }
166 #endif
167
168 return NULL;
169 }
170
171 U_NAMESPACE_END
172