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253 lines
7.4 KiB
253 lines
7.4 KiB
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/***************************************************************************
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*
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* Copyright (C) 1998-2014, 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 "layout/LETypes.h"
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#include "layout/LESwaps.h"
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#include "sfnt.h"
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#include "cmaps.h"
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#include <stdio.h>
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#define SWAPU16(code) ((LEUnicode16) SWAPW(code))
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#define SWAPU32(code) ((LEUnicode32) SWAPL(code))
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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_bool found = FALSE;
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le_uint16 foundPlatformID = 0xFFFF;
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le_uint16 foundPlatformSpecificID = 0xFFFF;
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le_uint32 foundOffset = 0;
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le_uint16 foundTable = 0xFFFF;
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// first pass, look for MS table. (preferred?)
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for (i = 0; i < nSubtables && !found; i += 1) {
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const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
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le_uint16 platformID = SWAPW(esh->platformID);
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le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
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if (platformID == 3) { // microsoft
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switch (platformSpecificID) {
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case 1: // Unicode BMP (UCS-2)
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case 10: // Unicode UCS-4
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foundOffset = SWAPL(esh->encodingOffset);
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foundPlatformID = platformID;
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foundPlatformSpecificID = platformSpecificID;
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found = TRUE;
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foundTable = i;
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break;
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//default:
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// 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);
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}
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} else {
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//printf("%s:%d: platform ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
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}
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}
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// second pass, allow non MS table
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// first pass, look for MS table. (preferred?)
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for (i = 0; i < nSubtables && !found; i += 1) {
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const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
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le_uint16 platformID = SWAPW(esh->platformID);
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le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
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//printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
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switch(platformID) {
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case 0: // Unicode platform
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switch(platformSpecificID) {
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case 0:
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case 1:
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case 2:
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case 3:
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foundOffset = SWAPL(esh->encodingOffset);
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foundPlatformID = platformID;
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foundPlatformSpecificID = platformSpecificID;
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foundTable = i;
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found = TRUE;
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break;
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default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
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}
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break;
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//default:
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//printf("Skipping platform id %d\n", platformID);
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}
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}
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if (found)
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{
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subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
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//printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
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(void)foundPlatformID; // Suppress unused variable compiler warnings.
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(void)foundTable;
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(void)foundPlatformSpecificID;
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} else {
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printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
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return NULL;
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}
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le_uint16 tableFormat = SWAPW(subtable->format);
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//printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
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switch (tableFormat) {
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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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printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
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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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TTGlyphID result = 0;
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if (SWAPU16(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 (SWAPU16(fStartCodes[index + probe]) <= unicode) {
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index += probe;
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}
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}
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if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
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if (fIdRangeOffset[index] == 0) {
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result = (TTGlyphID) unicode;
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} else {
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le_uint16 offset = unicode - SWAPU16(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 LE_SET_GLYPH(0, 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 (SWAPU32(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 (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
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range += probe;
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}
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}
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if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
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return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(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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