72cf296921
X-SVN-Rev: 9517
198 lines
4.8 KiB
C++
198 lines
4.8 KiB
C++
/***************************************************************************
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*
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* Copyright (C) 1998-2002, International Business Machines
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* Corporation and others. All Rights Reserved.
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*
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************************************************************************/
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#include "LETypes.h"
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#include "LESwaps.h"
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#include "sfnt.h"
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#include "cmaps.h"
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//
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// Finds the high bit by binary searching
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// through the bits in value.
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//
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le_int8 highBit(le_uint32 value)
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{
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le_uint8 bit = 0;
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if (value >= 1 << 16) {
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value >>= 16;
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bit += 16;
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}
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if (value >= 1 << 8) {
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value >>= 8;
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bit += 8;
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}
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if (value >= 1 << 4) {
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value >>= 4;
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bit += 4;
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}
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if (value >= 1 << 2) {
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value >>= 2;
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bit += 2;
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}
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if (value >= 1 << 1) {
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value >>= 1;
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bit += 1;
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}
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return bit;
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}
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CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
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{
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le_uint16 i;
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le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
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const CMAPEncodingSubtable *subtable = NULL;
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le_uint32 offset1 = 0, offset10 = 0;
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for (i = 0; i < nSubtables; i += 1) {
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const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
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if (SWAPW(esh->platformID) == 3) {
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switch (SWAPW(esh->platformSpecificID)) {
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case 1:
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offset1 = SWAPL(esh->encodingOffset);
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break;
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case 10:
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offset10 = SWAPL(esh->encodingOffset);
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break;
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}
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}
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}
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if (offset10 != 0)
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{
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subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + offset10);
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} else if (offset1 != 0) {
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subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + offset1);
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} else {
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return NULL;
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}
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switch (SWAPW(subtable->format)) {
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case 4:
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return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
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case 12:
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{
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const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
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return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
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}
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default:
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break;
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}
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return NULL;
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}
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CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
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: CMAPMapper(cmap)
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{
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le_uint16 segCount = SWAPW(header->segCountX2) / 2;
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fEntrySelector = SWAPW(header->entrySelector);
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fRangeShift = SWAPW(header->rangeShift) / 2;
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fEndCodes = &header->endCodes[0];
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fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
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fIdDelta = &fStartCodes[segCount];
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fIdRangeOffset = &fIdDelta[segCount];
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}
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LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
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{
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if (unicode32 >= 0x10000) {
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return 0;
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}
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LEUnicode16 unicode = (LEUnicode16) unicode32;
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le_uint16 index = 0;
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le_uint16 probe = 1 << fEntrySelector;
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LEGlyphID result = 0;
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if (SWAPW(fStartCodes[fRangeShift]) <= unicode) {
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index = fRangeShift;
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}
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while (probe > (1 << 0)) {
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probe >>= 1;
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if (SWAPW(fStartCodes[index + probe]) <= unicode) {
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index += probe;
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}
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}
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if (unicode >= SWAPW(fStartCodes[index]) && unicode <= SWAPW(fEndCodes[index])) {
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if (fIdRangeOffset[index] == 0) {
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result = (LEGlyphID) unicode;
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} else {
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le_uint16 offset = unicode - SWAPW(fStartCodes[index]);
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le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
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le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
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result = SWAPW(glyphIndexTable[offset]);
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}
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result += SWAPW(fIdDelta[index]);
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} else {
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result = 0;
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}
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return result;
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}
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CMAPFormat4Mapper::~CMAPFormat4Mapper()
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{
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// parent destructor does it all
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}
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CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
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: CMAPMapper(cmap), fGroups(groups)
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{
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le_uint8 bit = highBit(nGroups);
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fPower = 1 << bit;
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fRangeOffset = nGroups - fPower;
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}
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LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
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{
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le_int32 probe = fPower;
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le_int32 range = 0;
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if (SWAPL(fGroups[fRangeOffset].startCharCode) <= unicode32) {
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range = fRangeOffset;
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}
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while (probe > (1 << 0)) {
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probe >>= 1;
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if (SWAPL(fGroups[range + probe].startCharCode) <= unicode32) {
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range += probe;
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}
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}
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if (SWAPL(fGroups[range].startCharCode) <= unicode32 && SWAPL(fGroups[range].endCharCode) >= unicode32) {
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return (LEGlyphID) (SWAPL(fGroups[range].startGlyphCode) + unicode32 - SWAPL(fGroups[range].startCharCode));
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}
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return 0;
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}
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CMAPGroupMapper::~CMAPGroupMapper()
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{
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// parent destructor does it all
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}
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