1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
****************************************************************************** *
*
* Copyright (C) 1999-2003, International Business Machines
* Corporation and others. All Rights Reserved.
*
****************************************************************************** *
* file name: cmaps.cpp
*
* created on: ??/??/2001
* created by: Eric R. Mader
*/
#include "layout/LETypes.h"
#include "layout/LESwaps.h"
#include "sfnt.h"
#include "cmaps.h"
#define SWAPU16(code) ((LEUnicode16) SWAPW(code))
#define SWAPU32(code) ((LEUnicode32) SWAPL(code))
//
// Finds the high bit by binary searching
// through the bits in value.
//
le_uint8 highBit(le_uint32 value)
{
le_uint8 bit = 0;
if (value >= 1 << 16) {
value >>= 16;
bit += 16;
}
if (value >= 1 << 8) {
value >>= 8;
bit += 8;
}
if (value >= 1 << 4) {
value >>= 4;
bit += 4;
}
if (value >= 1 << 2) {
value >>= 2;
bit += 2;
}
if (value >= 1 << 1) {
value >>= 1;
bit += 1;
}
return bit;
}
CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
{
le_uint16 i;
le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
const CMAPEncodingSubtable *subtable = NULL;
le_uint32 offset1 = 0, offset10 = 0;
for (i = 0; i < nSubtables; i += 1) {
const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
if (SWAPW(esh->platformID) == 3) {
switch (SWAPW(esh->platformSpecificID)) {
case 1:
offset1 = SWAPL(esh->encodingOffset);
break;
case 10:
offset10 = SWAPL(esh->encodingOffset);
break;
}
}
}
if (offset10 != 0)
{
subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + offset10);
} else if (offset1 != 0) {
subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + offset1);
} else {
return NULL;
}
switch (SWAPW(subtable->format)) {
case 4:
return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
case 12:
{
const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
}
default:
break;
}
return NULL;
}
CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
: CMAPMapper(cmap)
{
le_uint16 segCount = SWAPW(header->segCountX2) / 2;
fEntrySelector = SWAPW(header->entrySelector);
fRangeShift = SWAPW(header->rangeShift) / 2;
fEndCodes = &header->endCodes[0];
fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
fIdDelta = &fStartCodes[segCount];
fIdRangeOffset = &fIdDelta[segCount];
}
LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
{
if (unicode32 >= 0x10000) {
return 0;
}
LEUnicode16 unicode = (LEUnicode16) unicode32;
le_uint16 index = 0;
le_uint16 probe = 1 << fEntrySelector;
TTGlyphID result = 0;
if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
index = fRangeShift;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
index += probe;
}
}
if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
if (fIdRangeOffset[index] == 0) {
result = (TTGlyphID) unicode;
} else {
le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
result = SWAPW(glyphIndexTable[offset]);
}
result += SWAPW(fIdDelta[index]);
} else {
result = 0;
}
return LE_SET_GLYPH(0, result);
}
CMAPFormat4Mapper::~CMAPFormat4Mapper()
{
// parent destructor does it all
}
CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
: CMAPMapper(cmap), fGroups(groups)
{
le_uint8 bit = highBit(nGroups);
fPower = 1 << bit;
fRangeOffset = nGroups - fPower;
}
LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
{
le_int32 probe = fPower;
le_int32 range = 0;
if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
range = fRangeOffset;
}
while (probe > (1 << 0)) {
probe >>= 1;
if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
range += probe;
}
}
if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
}
return 0;
}
CMAPGroupMapper::~CMAPGroupMapper()
{
// parent destructor does it all
}
|
