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| 1 /*************************************************************************** | |
| 2 * | |
| 3 * Copyright (C) 1998-2002, International Business Machines | |
| 4 * Corporation and others. All Rights Reserved. | |
| 5 * | |
| 6 ************************************************************************/ | |
| 7 | |
| 8 #include <stdio.h> | |
| 9 | |
| 10 #include "LETypes.h" | |
| 11 #include "FontObject.h" | |
| 12 #include "LESwaps.h" | |
| 13 | |
| 14 FontObject::FontObject(char *fileName) | |
| 15 : directory(NULL), numTables(0), searchRange(0),entrySelector(0), | |
| 16 cmapTable(NULL), cmSegCount(0), cmSearchRange(0), cmEntrySelector(0), | |
| 17 cmEndCodes(NULL), cmStartCodes(NULL), cmIdDelta(0), cmIdRangeOffset(0), | |
| 18 headTable(NULL), hmtxTable(NULL), numGlyphs(0), numOfLongHorMetrics(0), file
(NULL) | |
| 19 { | |
| 20 file = fopen(fileName, "rb"); | |
| 21 | |
| 22 if (file == NULL) { | |
| 23 printf("?? Couldn't open %s", fileName); | |
| 24 return; | |
| 25 } | |
| 26 | |
| 27 SFNTDirectory tempDir; | |
| 28 | |
| 29 fread(&tempDir, sizeof tempDir, 1, file); | |
| 30 | |
| 31 numTables = SWAPW(tempDir.numTables); | |
| 32 searchRange = SWAPW(tempDir.searchRange) >> 4; | |
| 33 entrySelector = SWAPW(tempDir.entrySelector); | |
| 34 rangeShift = SWAPW(tempDir.rangeShift) >> 4; | |
| 35 | |
| 36 int dirSize = sizeof tempDir + ((numTables - ANY_NUMBER) * sizeof(DirectoryE
ntry)); | |
| 37 | |
| 38 directory = (SFNTDirectory *) new char[dirSize]; | |
| 39 | |
| 40 fseek(file, 0L, SEEK_SET); | |
| 41 fread(directory, sizeof(char), dirSize, file); | |
| 42 | |
| 43 initUnicodeCMAP(); | |
| 44 } | |
| 45 | |
| 46 FontObject::~FontObject() | |
| 47 { | |
| 48 fclose(file); | |
| 49 delete[] directory; | |
| 50 delete[] cmapTable; | |
| 51 delete[] headTable; | |
| 52 delete[] hmtxTable; | |
| 53 } | |
| 54 | |
| 55 void FontObject::deleteTable(void *table) | |
| 56 { | |
| 57 delete[] (char *) table; | |
| 58 } | |
| 59 | |
| 60 DirectoryEntry *FontObject::findTable(LETag tag) | |
| 61 { | |
| 62 le_uint16 table = 0; | |
| 63 le_uint16 probe = 1 << entrySelector; | |
| 64 | |
| 65 if (SWAPL(directory->tableDirectory[rangeShift].tag) <= tag) { | |
| 66 table = rangeShift; | |
| 67 } | |
| 68 | |
| 69 while (probe > (1 << 0)) { | |
| 70 probe >>= 1; | |
| 71 | |
| 72 if (SWAPL(directory->tableDirectory[table + probe].tag) <= tag) { | |
| 73 table += probe; | |
| 74 } | |
| 75 } | |
| 76 | |
| 77 if (SWAPL(directory->tableDirectory[table].tag) == tag) { | |
| 78 return &directory->tableDirectory[table]; | |
| 79 } | |
| 80 | |
| 81 return NULL; | |
| 82 } | |
| 83 | |
| 84 void *FontObject::readTable(LETag tag, le_uint32 *length) | |
| 85 { | |
| 86 DirectoryEntry *entry = findTable(tag); | |
| 87 | |
| 88 if (entry == NULL) { | |
| 89 *length = 0; | |
| 90 return NULL; | |
| 91 } | |
| 92 | |
| 93 *length = SWAPL(entry->length); | |
| 94 | |
| 95 void *table = new char[*length]; | |
| 96 | |
| 97 fseek(file, SWAPL(entry->offset), SEEK_SET); | |
| 98 fread(table, sizeof(char), *length, file); | |
| 99 | |
| 100 return table; | |
| 101 } | |
| 102 | |
| 103 CMAPEncodingSubtable *FontObject::findCMAP(le_uint16 platformID, le_uint16 platf
ormSpecificID) | |
| 104 { | |
| 105 LETag cmapTag = 0x636D6170; // 'cmap' | |
| 106 | |
| 107 if (cmapTable == NULL) { | |
| 108 le_uint32 length; | |
| 109 | |
| 110 cmapTable = (CMAPTable *) readTable(cmapTag, &length); | |
| 111 } | |
| 112 | |
| 113 if (cmapTable != NULL) { | |
| 114 le_uint16 i; | |
| 115 le_uint16 nSubtables = SWAPW(cmapTable->numberSubtables); | |
| 116 | |
| 117 | |
| 118 for (i = 0; i < nSubtables; i += 1) { | |
| 119 CMAPEncodingSubtableHeader *esh = &cmapTable->encodingSubtableHeader
s[i]; | |
| 120 | |
| 121 if (SWAPW(esh->platformID) == platformID && | |
| 122 SWAPW(esh->platformSpecificID) == platformSpecificID) { | |
| 123 return (CMAPEncodingSubtable *) ((char *) cmapTable + SWAPL(esh-
>encodingOffset)); | |
| 124 } | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 return NULL; | |
| 129 } | |
| 130 | |
| 131 void FontObject::initUnicodeCMAP() | |
| 132 { | |
| 133 CMAPEncodingSubtable *encodingSubtable = findCMAP(3, 1); | |
| 134 | |
| 135 if (encodingSubtable == 0 || | |
| 136 SWAPW(encodingSubtable->format) != 4) { | |
| 137 printf("Can't find unicode 'cmap'"); | |
| 138 return; | |
| 139 } | |
| 140 | |
| 141 CMAPFormat4Encoding *header = (CMAPFormat4Encoding *) encodingSubtable; | |
| 142 | |
| 143 cmSegCount = SWAPW(header->segCountX2) / 2; | |
| 144 cmSearchRange = SWAPW(header->searchRange); | |
| 145 cmEntrySelector = SWAPW(header->entrySelector); | |
| 146 cmRangeShift = SWAPW(header->rangeShift) / 2; | |
| 147 cmEndCodes = &header->endCodes[0]; | |
| 148 cmStartCodes = &header->endCodes[cmSegCount + 1]; // + 1 for reservedPad... | |
| 149 cmIdDelta = &cmStartCodes[cmSegCount]; | |
| 150 cmIdRangeOffset = &cmIdDelta[cmSegCount]; | |
| 151 } | |
| 152 | |
| 153 LEGlyphID FontObject::unicodeToGlyph(LEUnicode32 unicode32) | |
| 154 { | |
| 155 if (unicode32 >= 0x10000) { | |
| 156 return 0; | |
| 157 } | |
| 158 | |
| 159 LEUnicode16 unicode = (LEUnicode16) unicode32; | |
| 160 le_uint16 index = 0; | |
| 161 le_uint16 probe = 1 << cmEntrySelector; | |
| 162 LEGlyphID result = 0; | |
| 163 | |
| 164 if (SWAPW(cmStartCodes[cmRangeShift]) <= unicode) { | |
| 165 index = cmRangeShift; | |
| 166 } | |
| 167 | |
| 168 while (probe > (1 << 0)) { | |
| 169 probe >>= 1; | |
| 170 | |
| 171 if (SWAPW(cmStartCodes[index + probe]) <= unicode) { | |
| 172 index += probe; | |
| 173 } | |
| 174 } | |
| 175 | |
| 176 if (unicode >= SWAPW(cmStartCodes[index]) && unicode <= SWAPW(cmEndCodes[ind
ex])) { | |
| 177 if (cmIdRangeOffset[index] == 0) { | |
| 178 result = (LEGlyphID) unicode; | |
| 179 } else { | |
| 180 le_uint16 offset = unicode - SWAPW(cmStartCodes[index]); | |
| 181 le_uint16 rangeOffset = SWAPW(cmIdRangeOffset[index]); | |
| 182 le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &cmIdRangeOffse
t[index] + rangeOffset); | |
| 183 | |
| 184 result = SWAPW(glyphIndexTable[offset]); | |
| 185 } | |
| 186 | |
| 187 result += SWAPW(cmIdDelta[index]); | |
| 188 } else { | |
| 189 result = 0; | |
| 190 } | |
| 191 | |
| 192 return result; | |
| 193 } | |
| 194 | |
| 195 le_uint16 FontObject::getUnitsPerEM() | |
| 196 { | |
| 197 if (headTable == NULL) { | |
| 198 LETag headTag = 0x68656164; // 'head' | |
| 199 le_uint32 length; | |
| 200 | |
| 201 headTable = (HEADTable *) readTable(headTag, &length); | |
| 202 } | |
| 203 | |
| 204 return SWAPW(headTable->unitsPerEm); | |
| 205 } | |
| 206 | |
| 207 le_uint16 FontObject::getGlyphAdvance(LEGlyphID glyph) | |
| 208 { | |
| 209 if (hmtxTable == NULL) { | |
| 210 LETag maxpTag = 0x6D617870; // 'maxp' | |
| 211 LETag hheaTag = 0x68686561; // 'hhea' | |
| 212 LETag hmtxTag = 0x686D7478; // 'hmtx' | |
| 213 le_uint32 length; | |
| 214 HHEATable *hheaTable; | |
| 215 MAXPTable *maxpTable = (MAXPTable *) readTable(maxpTag, &length); | |
| 216 | |
| 217 numGlyphs = SWAPW(maxpTable->numGlyphs); | |
| 218 deleteTable(maxpTable); | |
| 219 | |
| 220 hheaTable = (HHEATable *) readTable(hheaTag, &length); | |
| 221 numOfLongHorMetrics = SWAPW(hheaTable->numOfLongHorMetrics); | |
| 222 deleteTable(hheaTable); | |
| 223 | |
| 224 hmtxTable = (HMTXTable *) readTable(hmtxTag, &length); | |
| 225 } | |
| 226 | |
| 227 le_uint16 index = glyph; | |
| 228 | |
| 229 if (glyph >= numGlyphs) { | |
| 230 return 0; | |
| 231 } | |
| 232 | |
| 233 if (glyph >= numOfLongHorMetrics) { | |
| 234 index = numOfLongHorMetrics - 1; | |
| 235 } | |
| 236 | |
| 237 return SWAPW(hmtxTable->hMetrics[index].advanceWidth); | |
| 238 } | |
| 239 | |
| 240 | |
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Chromium Code Reviews
Issue 2435373002:
Delete source/test (Closed)
