437 lines
11 KiB
C++
437 lines
11 KiB
C++
/*
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*******************************************************************************
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*
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* Copyright (C) 1999-2008, 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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* file name: PortableFontInstance.cpp
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*
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* created on: 11/22/1999
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* created by: Eric R. Mader
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*/
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#include <stdio.h>
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#include "layout/LETypes.h"
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#include "layout/LEFontInstance.h"
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#include "layout/LESwaps.h"
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#include "PortableFontInstance.h"
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#include "letest.h"
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#include "sfnt.h"
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#include <string.h>
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//
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// Finds the high bit by binary searching
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// through the bits in n.
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//
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le_int8 PortableFontInstance::highBit(le_int32 value)
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{
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if (value <= 0) {
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return -32;
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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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PortableFontInstance::PortableFontInstance(const char *fileName, float pointSize, LEErrorCode &status)
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: fFile(NULL), fPointSize(pointSize), fUnitsPerEM(0), fFontChecksum(0), fAscent(0), fDescent(0), fLeading(0),
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fDirectory(NULL), fNAMETable(NULL), fNameCount(0), fNameStringOffset(0), fCMAPMapper(NULL), fHMTXTable(NULL), fNumGlyphs(0), fNumLongHorMetrics(0)
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{
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if (LE_FAILURE(status)) {
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return;
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}
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// open the font file
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fFile = fopen(fileName, "rb");
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if (fFile == NULL) {
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status = LE_FONT_FILE_NOT_FOUND_ERROR;
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return;
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}
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// read in the directory
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SFNTDirectory tempDir;
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fread(&tempDir, sizeof tempDir, 1, fFile);
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le_int32 dirSize = sizeof tempDir + ((SWAPW(tempDir.numTables) - ANY_NUMBER) * sizeof(DirectoryEntry));
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const LETag headTag = LE_HEAD_TABLE_TAG;
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const LETag hheaTag = LE_HHEA_TABLE_TAG;
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const HEADTable *headTable = NULL;
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const HHEATable *hheaTable = NULL;
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// const NAMETable *nameTable = NULL;
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le_uint16 numTables = 0;
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fDirectory = (const SFNTDirectory *) NEW_ARRAY(char, dirSize);
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if (fDirectory == NULL) {
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status = LE_MEMORY_ALLOCATION_ERROR;
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goto error_exit;
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}
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fseek(fFile, 0L, SEEK_SET);
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fread((void *) fDirectory, sizeof(char), dirSize, fFile);
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//
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// We calculate these numbers 'cause some fonts
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// have bogus values for them in the directory header.
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//
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numTables = SWAPW(fDirectory->numTables);
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fDirPower = 1 << highBit(numTables);
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fDirExtra = numTables - fDirPower;
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// read unitsPerEm from 'head' table
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headTable = (const HEADTable *) readFontTable(headTag);
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if (headTable == NULL) {
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status = LE_MISSING_FONT_TABLE_ERROR;
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goto error_exit;
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}
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fUnitsPerEM = SWAPW(headTable->unitsPerEm);
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fFontChecksum = SWAPL(headTable->checksumAdjustment);
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freeFontTable(headTable);
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//nameTable = (NAMETable *) readFontTable(nameTag);
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//if (nameTable == NULL) {
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// status = LE_MISSING_FONT_TABLE_ERROR;
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// goto error_exit;
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//}
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//fFontVersionString = findName(nameTable, NAME_VERSION_STRING, PLATFORM_MACINTOSH, MACINTOSH_ROMAN, MACINTOSH_ENGLISH);
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//if (fFontVersionString == NULL) {
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// status = LE_MISSING_FONT_TABLE_ERROR;
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// goto error_exit;
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//}
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//freeFontTable(nameTable);
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hheaTable = (HHEATable *) readFontTable(hheaTag);
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if (hheaTable == NULL) {
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status = LE_MISSING_FONT_TABLE_ERROR;
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goto error_exit;
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}
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fAscent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->ascent));
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fDescent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->descent));
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fLeading = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->lineGap));
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fNumLongHorMetrics = SWAPW(hheaTable->numOfLongHorMetrics);
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freeFontTable((void *) hheaTable);
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fCMAPMapper = findUnicodeMapper();
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if (fCMAPMapper == NULL) {
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status = LE_MISSING_FONT_TABLE_ERROR;
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goto error_exit;
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}
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return;
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error_exit:
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fclose(fFile);
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fFile = NULL;
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return;
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}
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PortableFontInstance::~PortableFontInstance()
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{
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if (fFile != NULL) {
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fclose(fFile);
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freeFontTable(fHMTXTable);
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freeFontTable(fNAMETable);
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delete fCMAPMapper;
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DELETE_ARRAY(fDirectory);
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}
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}
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const DirectoryEntry *PortableFontInstance::findTable(LETag tag) const
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{
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if (fDirectory != NULL) {
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le_uint16 table = 0;
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le_uint16 probe = fDirPower;
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if (SWAPL(fDirectory->tableDirectory[fDirExtra].tag) <= tag) {
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table = fDirExtra;
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}
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while (probe > (1 << 0)) {
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probe >>= 1;
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if (SWAPL(fDirectory->tableDirectory[table + probe].tag) <= tag) {
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table += probe;
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}
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}
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if (SWAPL(fDirectory->tableDirectory[table].tag) == tag) {
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return &fDirectory->tableDirectory[table];
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}
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}
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return NULL;
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}
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const void *PortableFontInstance::readTable(LETag tag, le_uint32 *length) const
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{
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const DirectoryEntry *entry = findTable(tag);
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if (entry == NULL) {
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*length = 0;
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return NULL;
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}
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*length = SWAPL(entry->length);
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void *table = NEW_ARRAY(char, *length);
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if (table != NULL) {
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fseek(fFile, SWAPL(entry->offset), SEEK_SET);
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fread(table, sizeof(char), *length, fFile);
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}
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return table;
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}
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const void *PortableFontInstance::getFontTable(LETag tableTag) const
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{
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return FontTableCache::find(tableTag);
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}
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const void *PortableFontInstance::readFontTable(LETag tableTag) const
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{
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le_uint32 len;
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return readTable(tableTag, &len);
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}
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CMAPMapper *PortableFontInstance::findUnicodeMapper()
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{
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LETag cmapTag = LE_CMAP_TABLE_TAG;
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const CMAPTable *cmap = (CMAPTable *) readFontTable(cmapTag);
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if (cmap == NULL) {
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return NULL;
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}
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return CMAPMapper::createUnicodeMapper(cmap);
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}
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const char *PortableFontInstance::getNameString(le_uint16 nameID, le_uint16 platformID, le_uint16 encodingID, le_uint16 languageID) const
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{
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if (fNAMETable == NULL) {
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LETag nameTag = LE_NAME_TABLE_TAG;
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PortableFontInstance *realThis = (PortableFontInstance *) this;
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realThis->fNAMETable = (const NAMETable *) readFontTable(nameTag);
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if (realThis->fNAMETable != NULL) {
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realThis->fNameCount = SWAPW(realThis->fNAMETable->count);
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realThis->fNameStringOffset = SWAPW(realThis->fNAMETable->stringOffset);
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}
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}
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for(le_int32 i = 0; i < fNameCount; i += 1) {
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const NameRecord *nameRecord = &fNAMETable->nameRecords[i];
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if (SWAPW(nameRecord->platformID) == platformID && SWAPW(nameRecord->encodingID) == encodingID &&
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SWAPW(nameRecord->languageID) == languageID && SWAPW(nameRecord->nameID) == nameID) {
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char *name = ((char *) fNAMETable) + fNameStringOffset + SWAPW(nameRecord->offset);
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le_uint16 length = SWAPW(nameRecord->length);
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char *result = NEW_ARRAY(char, length + 2);
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ARRAY_COPY(result, name, length);
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result[length] = result[length + 1] = 0;
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return result;
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}
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}
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return NULL;
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}
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const LEUnicode16 *PortableFontInstance::getUnicodeNameString(le_uint16 nameID, le_uint16 platformID, le_uint16 encodingID, le_uint16 languageID) const
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{
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if (fNAMETable == NULL) {
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LETag nameTag = LE_NAME_TABLE_TAG;
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PortableFontInstance *realThis = (PortableFontInstance *) this;
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realThis->fNAMETable = (const NAMETable *) readFontTable(nameTag);
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if (realThis->fNAMETable != NULL) {
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realThis->fNameCount = SWAPW(realThis->fNAMETable->count);
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realThis->fNameStringOffset = SWAPW(realThis->fNAMETable->stringOffset);
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}
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}
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for(le_int32 i = 0; i < fNameCount; i += 1) {
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const NameRecord *nameRecord = &fNAMETable->nameRecords[i];
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if (SWAPW(nameRecord->platformID) == platformID && SWAPW(nameRecord->encodingID) == encodingID &&
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SWAPW(nameRecord->languageID) == languageID && SWAPW(nameRecord->nameID) == nameID) {
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LEUnicode16 *name = (LEUnicode16 *) (((char *) fNAMETable) + fNameStringOffset + SWAPW(nameRecord->offset));
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le_uint16 length = SWAPW(nameRecord->length) / 2;
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LEUnicode16 *result = NEW_ARRAY(LEUnicode16, length + 2);
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for (le_int32 c = 0; c < length; c += 1) {
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result[c] = SWAPW(name[c]);
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}
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result[length] = 0;
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return result;
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}
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}
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return NULL;
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}
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void PortableFontInstance::deleteNameString(const char *name) const
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{
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DELETE_ARRAY(name);
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}
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void PortableFontInstance::deleteNameString(const LEUnicode16 *name) const
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{
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DELETE_ARRAY(name);
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}
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void PortableFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const
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{
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TTGlyphID ttGlyph = (TTGlyphID) LE_GET_GLYPH(glyph);
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if (fHMTXTable == NULL) {
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LETag maxpTag = LE_MAXP_TABLE_TAG;
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LETag hmtxTag = LE_HMTX_TABLE_TAG;
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const MAXPTable *maxpTable = (MAXPTable *) readFontTable(maxpTag);
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PortableFontInstance *realThis = (PortableFontInstance *) this;
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if (maxpTable != NULL) {
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realThis->fNumGlyphs = SWAPW(maxpTable->numGlyphs);
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freeFontTable(maxpTable);
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}
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realThis->fHMTXTable = (const HMTXTable *) readFontTable(hmtxTag);
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}
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le_uint16 index = ttGlyph;
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if (ttGlyph >= fNumGlyphs || fHMTXTable == NULL) {
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advance.fX = advance.fY = 0;
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return;
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}
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if (ttGlyph >= fNumLongHorMetrics) {
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index = fNumLongHorMetrics - 1;
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}
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advance.fX = xUnitsToPoints(SWAPW(fHMTXTable->hMetrics[index].advanceWidth));
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advance.fY = 0;
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}
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le_bool PortableFontInstance::getGlyphPoint(LEGlyphID /*glyph*/, le_int32 /*pointNumber*/, LEPoint &/*point*/) const
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{
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return FALSE;
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}
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le_int32 PortableFontInstance::getUnitsPerEM() const
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{
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return fUnitsPerEM;
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}
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le_uint32 PortableFontInstance::getFontChecksum() const
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{
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return fFontChecksum;
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}
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le_int32 PortableFontInstance::getAscent() const
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{
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return fAscent;
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}
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le_int32 PortableFontInstance::getDescent() const
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{
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return fDescent;
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}
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le_int32 PortableFontInstance::getLeading() const
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{
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return fLeading;
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}
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// We really want to inherit this method from the superclass, but some compilers
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// issue a warning if we don't implement it...
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LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper, le_bool filterZeroWidth) const
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{
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return LEFontInstance::mapCharToGlyph(ch, mapper, filterZeroWidth);
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}
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// We really want to inherit this method from the superclass, but some compilers
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// issue a warning if we don't implement it...
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LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch, const LECharMapper *mapper) const
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{
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return LEFontInstance::mapCharToGlyph(ch, mapper);
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}
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LEGlyphID PortableFontInstance::mapCharToGlyph(LEUnicode32 ch) const
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{
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return fCMAPMapper->unicodeToGlyph(ch);
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}
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float PortableFontInstance::getXPixelsPerEm() const
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{
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return fPointSize;
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}
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float PortableFontInstance::getYPixelsPerEm() const
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{
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return fPointSize;
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}
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float PortableFontInstance::getScaleFactorX() const
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{
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return 1.0;
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}
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float PortableFontInstance::getScaleFactorY() const
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{
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return 1.0;
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}
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