You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
254 lines
7.4 KiB
254 lines
7.4 KiB
4 months ago
|
/**************************************************************************
|
||
|
|
*
|
||
|
|
* © 2016 and later: Unicode, Inc. and others.
|
||
|
|
* License & terms of use: http://www.unicode.org/copyright.html
|
||
|
|
*
|
||
|
|
***************************************************************************
|
||
|
|
***************************************************************************
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
}
|
||
|
|
|