| /* |
| ******************************************************************************* |
| * |
| * Copyright (C) 1999-2003, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| * |
| ******************************************************************************* |
| * file name: PortableFontInstance.cpp |
| * |
| * created on: 11/22/1999 |
| * created by: Eric R. Mader |
| */ |
| |
| #include <stdio.h> |
| |
| #include "layout/LETypes.h" |
| #include "layout/LEFontInstance.h" |
| #include "layout/LESwaps.h" |
| |
| #include "PortableFontInstance.h" |
| |
| #include "sfnt.h" |
| |
| #include <string.h> |
| |
| // |
| // Finds the high bit by binary searching |
| // through the bits in n. |
| // |
| le_int8 PortableFontInstance::highBit(le_int32 value) |
| { |
| if (value <= 0) { |
| return -32; |
| } |
| |
| 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; |
| } |
| |
| |
| PortableFontInstance::PortableFontInstance(char *fileName, float pointSize, LEErrorCode &status) |
| : fFile(NULL), fUnitsPerEM(0), fPointSize(pointSize), fAscent(0), fDescent(0), fLeading(0), |
| fDirectory(NULL), fCMAPMapper(NULL), fHMTXTable(NULL), fNumGlyphs(0), fNumLongHorMetrics(0) |
| { |
| if (LE_FAILURE(status)) { |
| return; |
| } |
| |
| // open the font file |
| fFile = fopen(fileName, "rb"); |
| |
| if (fFile == NULL) { |
| status = LE_FONT_FILE_NOT_FOUND_ERROR; |
| return; |
| } |
| |
| // read in the directory |
| SFNTDirectory tempDir; |
| |
| fread(&tempDir, sizeof tempDir, 1, fFile); |
| |
| le_int32 dirSize = sizeof tempDir + ((SWAPW(tempDir.numTables) - ANY_NUMBER) * sizeof(DirectoryEntry)); |
| const LETag headTag = LE_HEAD_TABLE_TAG; |
| const LETag hheaTag = LE_HHEA_TABLE_TAG; |
| const HEADTable *headTable = NULL; |
| const HHEATable *hheaTable = NULL; |
| le_uint16 numTables = 0; |
| |
| fDirectory = (const SFNTDirectory *) LE_NEW_ARRAY(char, dirSize); |
| |
| if (fDirectory == NULL) { |
| status = LE_MEMORY_ALLOCATION_ERROR; |
| goto error_exit; |
| } |
| |
| fseek(fFile, 0L, SEEK_SET); |
| fread((void *) fDirectory, sizeof(char), dirSize, fFile); |
| |
| // |
| // We calculate these numbers 'cause some fonts |
| // have bogus values for them in the directory header. |
| // |
| numTables = SWAPW(fDirectory->numTables); |
| fDirPower = 1 << highBit(numTables); |
| fDirExtra = numTables - fDirPower; |
| |
| // read unitsPerEm from 'head' table |
| headTable = (const HEADTable *) readFontTable(headTag); |
| |
| if (headTable == NULL) { |
| status = LE_MISSING_FONT_TABLE_ERROR; |
| goto error_exit; |
| } |
| |
| fUnitsPerEM = SWAPW(headTable->unitsPerEm); |
| deleteTable(headTable); |
| |
| hheaTable = (HHEATable *) readFontTable(hheaTag); |
| |
| if (hheaTable == NULL) { |
| status = LE_MISSING_FONT_TABLE_ERROR; |
| goto error_exit; |
| } |
| |
| fAscent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->ascent)); |
| fDescent = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->descent)); |
| fLeading = (le_int32) yUnitsToPoints((float) SWAPW(hheaTable->lineGap)); |
| |
| fNumLongHorMetrics = SWAPW(hheaTable->numOfLongHorMetrics); |
| |
| deleteTable((void *) hheaTable); |
| |
| fCMAPMapper = findUnicodeMapper(); |
| |
| if (fCMAPMapper == NULL) { |
| status = LE_MISSING_FONT_TABLE_ERROR; |
| goto error_exit; |
| } |
| |
| return; |
| |
| error_exit: |
| fclose(fFile); |
| fFile = NULL; |
| return; |
| } |
| |
| PortableFontInstance::~PortableFontInstance() |
| { |
| if (fFile != NULL) { |
| fclose(fFile); |
| |
| deleteTable(fHMTXTable); |
| |
| delete fCMAPMapper; |
| |
| LE_DELETE_ARRAY(fDirectory); |
| } |
| }; |
| |
| void PortableFontInstance::deleteTable(const void *table) const |
| { |
| LE_DELETE_ARRAY(table); |
| } |
| |
| const DirectoryEntry *PortableFontInstance::findTable(LETag tag) const |
| { |
| if (fDirectory != NULL) { |
| le_uint16 table = 0; |
| le_uint16 probe = fDirPower; |
| |
| if (SWAPL(fDirectory->tableDirectory[fDirExtra].tag) <= tag) { |
| table = fDirExtra; |
| } |
| |
| while (probe > (1 << 0)) { |
| probe >>= 1; |
| |
| if (SWAPL(fDirectory->tableDirectory[table + probe].tag) <= tag) { |
| table += probe; |
| } |
| } |
| |
| if (SWAPL(fDirectory->tableDirectory[table].tag) == tag) { |
| return &fDirectory->tableDirectory[table]; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| const void *PortableFontInstance::readTable(LETag tag, le_uint32 *length) const |
| { |
| const DirectoryEntry *entry = findTable(tag); |
| |
| if (entry == NULL) { |
| *length = 0; |
| return NULL; |
| } |
| |
| *length = SWAPL(entry->length); |
| |
| void *table = LE_NEW_ARRAY(char, *length); |
| |
| if (table != NULL) { |
| fseek(fFile, SWAPL(entry->offset), SEEK_SET); |
| fread(table, sizeof(char), *length, fFile); |
| } |
| |
| return table; |
| } |
| |
| const void *PortableFontInstance::getFontTable(LETag tableTag) const |
| { |
| return FontTableCache::find(tableTag); |
| } |
| |
| const void *PortableFontInstance::readFontTable(LETag tableTag) const |
| { |
| le_uint32 len; |
| |
| return readTable(tableTag, &len); |
| } |
| |
| CMAPMapper *PortableFontInstance::findUnicodeMapper() |
| { |
| LETag cmapTag = LE_CMAP_TABLE_TAG; |
| const CMAPTable *cmap = (CMAPTable *) readFontTable(cmapTag); |
| |
| if (cmap == NULL) { |
| return NULL; |
| } |
| |
| return CMAPMapper::createUnicodeMapper(cmap); |
| } |
| |
| |
| void PortableFontInstance::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const |
| { |
| TTGlyphID ttGlyph = (TTGlyphID) LE_GET_GLYPH(glyph); |
| |
| if (fHMTXTable == NULL) { |
| LETag maxpTag = LE_MAXP_TABLE_TAG; |
| LETag hmtxTag = LE_HMTX_TABLE_TAG; |
| const MAXPTable *maxpTable = (MAXPTable *) readFontTable(maxpTag); |
| PortableFontInstance *realThis = (PortableFontInstance *) this; |
| |
| if (maxpTable != NULL) { |
| realThis->fNumGlyphs = SWAPW(maxpTable->numGlyphs); |
| deleteTable(maxpTable); |
| } |
| |
| realThis->fHMTXTable = (const HMTXTable *) readFontTable(hmtxTag); |
| } |
| |
| le_uint16 index = ttGlyph; |
| |
| if (ttGlyph >= fNumGlyphs || fHMTXTable == NULL) { |
| advance.fX = advance.fY = 0; |
| return; |
| } |
| |
| if (ttGlyph >= fNumLongHorMetrics) { |
| index = fNumLongHorMetrics - 1; |
| } |
| |
| advance.fX = xUnitsToPoints(SWAPW(fHMTXTable->hMetrics[index].advanceWidth)); |
| advance.fY = 0; |
| } |
| |
| le_bool PortableFontInstance::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const |
| { |
| return FALSE; |
| } |
| |