1 /***************************************************************************
3 * Copyright (C) 2016 and later: Unicode, Inc. and others.
4 * License & terms of use: http://www.unicode.org/copyright.html#License
6 ****************************************************************************/
7 /***************************************************************************
9 * Copyright (C) 1998-2013, International Business Machines
10 * Corporation and others. All Rights Reserved.
12 ************************************************************************/
17 #include "FontObject.h"
20 FontObject::FontObject(char *fileName)
21 : directory(NULL), numTables(0), searchRange(0),entrySelector(0),
22 cmapTable(NULL), cmSegCount(0), cmSearchRange(0), cmEntrySelector(0),
23 cmEndCodes(NULL), cmStartCodes(NULL), cmIdDelta(0), cmIdRangeOffset(0),
24 headTable(NULL), hmtxTable(NULL), numGlyphs(0), numOfLongHorMetrics(0), file(NULL)
26 file = fopen(fileName, "rb");
29 printf("?? Couldn't open %s", fileName);
33 SFNTDirectory tempDir;
35 fread(&tempDir, sizeof tempDir, 1, file);
37 numTables = SWAPW(tempDir.numTables);
38 searchRange = SWAPW(tempDir.searchRange) >> 4;
39 entrySelector = SWAPW(tempDir.entrySelector);
40 rangeShift = SWAPW(tempDir.rangeShift) >> 4;
42 int dirSize = sizeof tempDir + ((numTables - ANY_NUMBER) * sizeof(DirectoryEntry));
44 directory = (SFNTDirectory *) new char[dirSize];
46 fseek(file, 0L, SEEK_SET);
47 fread(directory, sizeof(char), dirSize, file);
52 FontObject::~FontObject()
61 void FontObject::deleteTable(void *table)
63 delete[] (char *) table;
66 DirectoryEntry *FontObject::findTable(LETag tag)
69 le_uint16 probe = 1 << entrySelector;
71 if (SWAPL(directory->tableDirectory[rangeShift].tag) <= tag) {
75 while (probe > (1 << 0)) {
78 if (SWAPL(directory->tableDirectory[table + probe].tag) <= tag) {
83 if (SWAPL(directory->tableDirectory[table].tag) == tag) {
84 return &directory->tableDirectory[table];
90 void *FontObject::readTable(LETag tag, le_uint32 *length)
92 DirectoryEntry *entry = findTable(tag);
99 *length = SWAPL(entry->length);
101 void *table = new char[*length];
103 fseek(file, SWAPL(entry->offset), SEEK_SET);
104 fread(table, sizeof(char), *length, file);
109 CMAPEncodingSubtable *FontObject::findCMAP(le_uint16 platformID, le_uint16 platformSpecificID)
111 LETag cmapTag = 0x636D6170; // 'cmap'
113 if (cmapTable == NULL) {
116 cmapTable = (CMAPTable *) readTable(cmapTag, &length);
119 if (cmapTable != NULL) {
121 le_uint16 nSubtables = SWAPW(cmapTable->numberSubtables);
124 for (i = 0; i < nSubtables; i += 1) {
125 CMAPEncodingSubtableHeader *esh = &cmapTable->encodingSubtableHeaders[i];
127 if (SWAPW(esh->platformID) == platformID &&
128 SWAPW(esh->platformSpecificID) == platformSpecificID) {
129 return (CMAPEncodingSubtable *) ((char *) cmapTable + SWAPL(esh->encodingOffset));
137 void FontObject::initUnicodeCMAP()
139 CMAPEncodingSubtable *encodingSubtable = findCMAP(3, 1);
141 if (encodingSubtable == 0 ||
142 SWAPW(encodingSubtable->format) != 4) {
143 printf("Can't find unicode 'cmap'");
147 CMAPFormat4Encoding *header = (CMAPFormat4Encoding *) encodingSubtable;
149 cmSegCount = SWAPW(header->segCountX2) / 2;
150 cmSearchRange = SWAPW(header->searchRange);
151 cmEntrySelector = SWAPW(header->entrySelector);
152 cmRangeShift = SWAPW(header->rangeShift) / 2;
153 cmEndCodes = &header->endCodes[0];
154 cmStartCodes = &header->endCodes[cmSegCount + 1]; // + 1 for reservedPad...
155 cmIdDelta = &cmStartCodes[cmSegCount];
156 cmIdRangeOffset = &cmIdDelta[cmSegCount];
159 LEGlyphID FontObject::unicodeToGlyph(LEUnicode32 unicode32)
161 if (unicode32 >= 0x10000) {
165 LEUnicode16 unicode = (LEUnicode16) unicode32;
167 le_uint16 probe = 1 << cmEntrySelector;
168 LEGlyphID result = 0;
170 if (SWAPW(cmStartCodes[cmRangeShift]) <= unicode) {
171 index = cmRangeShift;
174 while (probe > (1 << 0)) {
177 if (SWAPW(cmStartCodes[index + probe]) <= unicode) {
182 if (unicode >= SWAPW(cmStartCodes[index]) && unicode <= SWAPW(cmEndCodes[index])) {
183 if (cmIdRangeOffset[index] == 0) {
184 result = (LEGlyphID) unicode;
186 le_uint16 offset = unicode - SWAPW(cmStartCodes[index]);
187 le_uint16 rangeOffset = SWAPW(cmIdRangeOffset[index]);
188 le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &cmIdRangeOffset[index] + rangeOffset);
190 result = SWAPW(glyphIndexTable[offset]);
193 result += SWAPW(cmIdDelta[index]);
201 le_uint16 FontObject::getUnitsPerEM()
203 if (headTable == NULL) {
204 LETag headTag = 0x68656164; // 'head'
207 headTable = (HEADTable *) readTable(headTag, &length);
210 return SWAPW(headTable->unitsPerEm);
213 le_uint16 FontObject::getGlyphAdvance(LEGlyphID glyph)
215 if (hmtxTable == NULL) {
216 LETag maxpTag = 0x6D617870; // 'maxp'
217 LETag hheaTag = 0x68686561; // 'hhea'
218 LETag hmtxTag = 0x686D7478; // 'hmtx'
220 HHEATable *hheaTable;
221 MAXPTable *maxpTable = (MAXPTable *) readTable(maxpTag, &length);
223 numGlyphs = SWAPW(maxpTable->numGlyphs);
224 deleteTable(maxpTable);
226 hheaTable = (HHEATable *) readTable(hheaTag, &length);
227 numOfLongHorMetrics = SWAPW(hheaTable->numOfLongHorMetrics);
228 deleteTable(hheaTable);
230 hmtxTable = (HMTXTable *) readTable(hmtxTag, &length);
233 le_uint16 index = glyph;
235 if (glyph >= numGlyphs) {
239 if (glyph >= numOfLongHorMetrics) {
240 index = numOfLongHorMetrics - 1;
243 return SWAPW(hmtxTable->hMetrics[index].advanceWidth);