+/***************************************************************************
+*
+* Copyright (C) 1998-2013, International Business Machines
+* Corporation and others. All Rights Reserved.
+*
+************************************************************************/
+
+#include "layout/LETypes.h"
+#include "layout/LESwaps.h"
+
+#include "sfnt.h"
+#include "cmaps.h"
+#include <stdio.h>
+
+#define SWAPU16(code) ((LEUnicode16) SWAPW(code))
+#define SWAPU32(code) ((LEUnicode32) SWAPL(code))
+
+//
+// Finds the high bit by binary searching
+// through the bits in value.
+//
+le_int8 highBit(le_uint32 value)
+{
+ le_uint8 bit = 0;
+
+ if (value >= 1 << 16) {
+ value >>= 16;
+ bit += 16;
+ }
+
+ if (value >= 1 << 8) {
+ value >>= 8;
+ bit += 8;
+ }
+
+ if (value >= 1 << 4) {
+ value >>= 4;
+ bit += 4;
+ }
+
+ if (value >= 1 << 2) {
+ value >>= 2;
+ bit += 2;
+ }
+
+ if (value >= 1 << 1) {
+ value >>= 1;
+ bit += 1;
+ }
+
+ return bit;
+}
+
+CMAPMapper *CMAPMapper::createUnicodeMapper(const CMAPTable *cmap)
+{
+ le_uint16 i;
+ le_uint16 nSubtables = SWAPW(cmap->numberSubtables);
+ const CMAPEncodingSubtable *subtable = NULL;
+ le_bool found = FALSE;
+ le_uint16 foundPlatformID = 0xFFFF;
+ le_uint16 foundPlatformSpecificID = 0xFFFF;
+ le_uint32 foundOffset = 0;
+ le_uint16 foundTable = 0xFFFF;
+ // first pass, look for MS table. (preferred?)
+ for (i = 0; i < nSubtables && !found; i += 1) {
+ const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
+
+ le_uint16 platformID = SWAPW(esh->platformID);
+ le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
+ if (platformID == 3) { // microsoft
+ switch (platformSpecificID) {
+ case 1: // Unicode BMP (UCS-2)
+ case 10: // Unicode UCS-4
+ foundOffset = SWAPL(esh->encodingOffset);
+ foundPlatformID = platformID;
+ foundPlatformSpecificID = platformSpecificID;
+ found = TRUE;
+ foundTable = i;
+ break;
+
+ //default:
+ // 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);
+ }
+ } else {
+ //printf("%s:%d: platform ID %d (wanted 3, microsoft) for subtable %d/%d\n", __FILE__, __LINE__, (SWAPW(esh->platformID)), i, nSubtables);
+ }
+ }
+
+ // second pass, allow non MS table
+ // first pass, look for MS table. (preferred?)
+ for (i = 0; i < nSubtables && !found; i += 1) {
+ const CMAPEncodingSubtableHeader *esh = &cmap->encodingSubtableHeaders[i];
+ le_uint16 platformID = SWAPW(esh->platformID);
+ le_uint16 platformSpecificID = SWAPW(esh->platformSpecificID);
+ //printf("%s:%d: table %d/%d has platform:specific %d:%d\n", __FILE__, __LINE__, i, nSubtables, platformID, platformSpecificID);
+ switch(platformID) {
+ case 0: // Unicode platform
+ switch(platformSpecificID) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ foundOffset = SWAPL(esh->encodingOffset);
+ foundPlatformID = platformID;
+ foundPlatformSpecificID = platformSpecificID;
+ foundTable = i;
+ found = TRUE;
+ break;
+
+ default: printf("Error: table %d (psid %d) is unknown. Skipping.\n", i, platformSpecificID); break;
+ }
+ break;
+
+ //default:
+ //printf("Skipping platform id %d\n", platformID);
+ }
+ }
+
+
+ if (found)
+ {
+ subtable = (const CMAPEncodingSubtable *) ((const char *) cmap + foundOffset);
+ //printf("%s:%d: using subtable #%d/%d type %d:%d\n", __FILE__, __LINE__, foundTable, nSubtables, foundPlatformID, foundPlatformSpecificID);
+ } else {
+ printf("%s:%d: could not find subtable.\n", __FILE__, __LINE__);
+ return NULL;
+ }
+
+ le_uint16 tableFormat = SWAPW(subtable->format);
+ //printf("%s:%d: table format %d\n", __FILE__, __LINE__, tableFormat);
+
+ switch (tableFormat) {
+ case 4:
+ return new CMAPFormat4Mapper(cmap, (const CMAPFormat4Encoding *) subtable);
+
+ case 12:
+ {
+ const CMAPFormat12Encoding *encoding = (const CMAPFormat12Encoding *) subtable;
+
+ return new CMAPGroupMapper(cmap, encoding->groups, SWAPL(encoding->nGroups));
+ }
+
+ default:
+ break;
+ }
+
+ printf("%s:%d: Unknown format %x.\n", __FILE__, __LINE__, (SWAPW(subtable->format)));
+ return NULL;
+}
+
+CMAPFormat4Mapper::CMAPFormat4Mapper(const CMAPTable *cmap, const CMAPFormat4Encoding *header)
+ : CMAPMapper(cmap)
+{
+ le_uint16 segCount = SWAPW(header->segCountX2) / 2;
+
+ fEntrySelector = SWAPW(header->entrySelector);
+ fRangeShift = SWAPW(header->rangeShift) / 2;
+ fEndCodes = &header->endCodes[0];
+ fStartCodes = &header->endCodes[segCount + 1]; // + 1 for reservedPad...
+ fIdDelta = &fStartCodes[segCount];
+ fIdRangeOffset = &fIdDelta[segCount];
+}
+
+LEGlyphID CMAPFormat4Mapper::unicodeToGlyph(LEUnicode32 unicode32) const
+{
+ if (unicode32 >= 0x10000) {
+ return 0;
+ }
+
+ LEUnicode16 unicode = (LEUnicode16) unicode32;
+ le_uint16 index = 0;
+ le_uint16 probe = 1 << fEntrySelector;
+ TTGlyphID result = 0;
+
+ if (SWAPU16(fStartCodes[fRangeShift]) <= unicode) {
+ index = fRangeShift;
+ }
+
+ while (probe > (1 << 0)) {
+ probe >>= 1;
+
+ if (SWAPU16(fStartCodes[index + probe]) <= unicode) {
+ index += probe;
+ }
+ }
+
+ if (unicode >= SWAPU16(fStartCodes[index]) && unicode <= SWAPU16(fEndCodes[index])) {
+ if (fIdRangeOffset[index] == 0) {
+ result = (TTGlyphID) unicode;
+ } else {
+ le_uint16 offset = unicode - SWAPU16(fStartCodes[index]);
+ le_uint16 rangeOffset = SWAPW(fIdRangeOffset[index]);
+ le_uint16 *glyphIndexTable = (le_uint16 *) ((char *) &fIdRangeOffset[index] + rangeOffset);
+
+ result = SWAPW(glyphIndexTable[offset]);
+ }
+
+ result += SWAPW(fIdDelta[index]);
+ } else {
+ result = 0;
+ }
+
+ return LE_SET_GLYPH(0, result);
+}
+
+CMAPFormat4Mapper::~CMAPFormat4Mapper()
+{
+ // parent destructor does it all
+}
+
+CMAPGroupMapper::CMAPGroupMapper(const CMAPTable *cmap, const CMAPGroup *groups, le_uint32 nGroups)
+ : CMAPMapper(cmap), fGroups(groups)
+{
+ le_uint8 bit = highBit(nGroups);
+ fPower = 1 << bit;
+ fRangeOffset = nGroups - fPower;
+}
+
+LEGlyphID CMAPGroupMapper::unicodeToGlyph(LEUnicode32 unicode32) const
+{
+ le_int32 probe = fPower;
+ le_int32 range = 0;
+
+ if (SWAPU32(fGroups[fRangeOffset].startCharCode) <= unicode32) {
+ range = fRangeOffset;
+ }
+
+ while (probe > (1 << 0)) {
+ probe >>= 1;
+
+ if (SWAPU32(fGroups[range + probe].startCharCode) <= unicode32) {
+ range += probe;
+ }
+ }
+
+ if (SWAPU32(fGroups[range].startCharCode) <= unicode32 && SWAPU32(fGroups[range].endCharCode) >= unicode32) {
+ return (LEGlyphID) (SWAPU32(fGroups[range].startGlyphCode) + unicode32 - SWAPU32(fGroups[range].startCharCode));
+ }
+
+ return 0;
+}
+
+CMAPGroupMapper::~CMAPGroupMapper()
+{
+ // parent destructor does it all
+}
+
projects / apple / icu.git / blobdiff