1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
2 // License & terms of use: http://www.unicode.org/copyright.html
3 /***************************************************************************
5 * Copyright (C) 1998-2014, International Business Machines
6 * Corporation and others. All Rights Reserved.
8 ************************************************************************/
10 #include "layout/LETypes.h"
11 #include "layout/LESwaps.h"
17 #define SWAPU16(code) ((LEUnicode16) SWAPW(code))
18 #define SWAPU32(code) ((LEUnicode32) SWAPL(code))
21 // Finds the high bit by binary searching
22 // through the bits in value.
24 le_int8 highBit(le_uint32 value)
28 if (value >= 1 << 16) {
33 if (value >= 1 << 8) {
38 if (value >= 1 << 4) {
43 if (value >= 1 << 2) {
48 if (value >= 1 << 1) {
56 CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
59 le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
60 const CMAPEncodingSubtable *subtable = NULL;
61 le_bool found = FALSE;
62 le_uint16 foundPlatformID = 0xFFFF;
63 le_uint16 foundPlatformSpecificID = 0xFFFF;
64 le_uint32 foundOffset = 0;
65 le_uint16 foundTable = 0xFFFF;
66 // first pass, look for MS table. (preferred?)
67 for (i = 0; i < nSubtables && !found; i += 1) {
68 const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
70 le_uint16 platformID = SWAPW(esh->platformID);
71 le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
72 if (platformID == 3) { // microsoft
73 switch (platformSpecificID) {
74 case 1: // Unicode BMP (UCS-2)
75 case 10: // Unicode UCS-4
76 foundOffset = SWAPL(esh->encodingOffset);
77 foundPlatformID = platformID;
78 foundPlatformSpecificID = platformSpecificID;
84 // printf("%s:%d: microsoft (3) platform specific ID %d (wanted 1 or 10) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformSpecificID)), i, nSubtables);
87 //printf("%s:%d: platform ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
91 // second pass, allow non MS table
92 // first pass, look for MS table. (preferred?)
93 for (i = 0; i < nSubtables && !found; i += 1) {
94 const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
95 le_uint16 platformID = SWAPW(esh->platformID);
96 le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
97 //printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
99 case 0: // Unicode platform
100 switch(platformSpecificID) {
105 foundOffset = SWAPL(esh->encodingOffset);
106 foundPlatformID = platformID;
107 foundPlatformSpecificID = platformSpecificID;
112 default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
117 //printf("Skipping platform id %d\n", platformID);
124 subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
125 //printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
126 (void)foundPlatformID; // Suppress unused variable compiler warnings.
128 (void)foundPlatformSpecificID;
130 printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
134 le_uint16 tableFormat = SWAPW(subtable->format);
135 //printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
137 switch (tableFormat) {
139 return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
143 const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
145 return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
152 printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
156 CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
159 le_uint16 segCount = SWAPW(header->segCountX2) / 2;
161 fEntrySelector = SWAPW(header->entrySelector);
162 fRangeShift = SWAPW(header->rangeShift) / 2;
163 fEndCodes = &header->endCodes[0];
164 fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
165 fIdDelta = &fStartCodes[segCount];
166 fIdRangeOffset = &fIdDelta[segCount];
169 LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
171 if (unicode32 >= 0x10000) {
175 LEUnicode16 unicode = (LEUnicode16) unicode32;
177 le_uint16 probe = 1 << fEntrySelector;
178 TTGlyphID result = 0;
180 if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
184 while (probe > (1 << 0)) {
187 if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
192 if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
193 if (fIdRangeOffset[index] == 0) {
194 result = (TTGlyphID) unicode;
196 le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
197 le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
198 le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
200 result = SWAPW(glyphIndexTable[offset]);
203 result += SWAPW(fIdDelta[index]);
208 return LE_SET_GLYPH(0, result);
211 CMAPFormat4Mapper::~CMAPFormat4Mapper()
213 // parent destructor does it all
216 CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
217 : CMAPMapper(cmap), fGroups(groups)
219 le_uint8 bit = highBit(nGroups);
221 fRangeOffset = nGroups - fPower;
224 LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
226 le_int32 probe = fPower;
229 if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
230 range = fRangeOffset;
233 while (probe > (1 << 0)) {
236 if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
241 if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
242 return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
248 CMAPGroupMapper::~CMAPGroupMapper()
250 // parent destructor does it all