/****************************************************************************\ Part of the XeTeX typesetting system copyright (c) 1994-2006 by SIL International written by Jonathan Kew Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 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Except as contained in this notice, the name of SIL International shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from SIL International. \****************************************************************************/ /* * file name: XeTeXFontInst.cpp * * created on: 2005-10-22 * created by: Jonathan Kew * * originally based on PortableFontInstance.cpp from ICU */ #include "LETypes.h" #include "LEFontInstance.h" #include "LESwaps.h" #include "XeTeXFontInst.h" #include "XeTeXLayoutInterface.h" #ifdef XETEX_MAC #include #endif #include "XeTeX_ext.h" #include "sfnt.h" #include XeTeXFontInst::XeTeXFontInst(float pointSize, LEErrorCode &status) : fPointSize(pointSize) , fUnitsPerEM(0) , fAscent(0) , fDescent(0) , fLeading(0) , fXHeight(0) , fItalicAngle(0) , fCMAPMapper(NULL) , fMetricsTable(NULL) , fNumLongMetrics(0) , fNumGlyphs(0) , fNumGlyphsInited(false) , fVertical(false) , fFilename(NULL) , fFirstCharCode(-1) , fLastCharCode(-1) { // the concrete subclass is responsible to call initialize() } XeTeXFontInst::~XeTeXFontInst() { if (fMetricsTable != NULL) deleteTable(fMetricsTable); if (fCMAPMapper != NULL) delete fCMAPMapper; } void XeTeXFontInst::initialize(LEErrorCode &status) { const LETag headTag = LE_HEAD_TABLE_TAG; const LETag hheaTag = LE_HHEA_TABLE_TAG; const LETag vheaTag = LE_VHEA_TABLE_TAG; const LETag postTag = LE_POST_TABLE_TAG; const HEADTable *headTable = NULL; const HHEATable *dirHeadTable = NULL; const POSTTable *postTable = NULL; // dispose of any cached metrics table if (fMetricsTable != NULL) { deleteTable(fMetricsTable); fMetricsTable = NULL; } // 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); // we use the fact that 'hhea' and 'vhea' have the same format! dirHeadTable = (const HHEATable *) readFontTable(fVertical ? vheaTag : hheaTag); if (dirHeadTable == NULL) { status = LE_MISSING_FONT_TABLE_ERROR; goto error_exit; } fAscent = yUnitsToPoints((float)(le_int16)SWAPW(dirHeadTable->ascent)); fDescent = yUnitsToPoints((float)(le_int16)SWAPW(dirHeadTable->descent)); fLeading = yUnitsToPoints((float)(le_int16)SWAPW(dirHeadTable->lineGap)); fNumLongMetrics = SWAPW(dirHeadTable->numOfLongHorMetrics); deleteTable(dirHeadTable); fCMAPMapper = findUnicodeMapper(); if (fCMAPMapper == NULL) { status = LE_MISSING_FONT_TABLE_ERROR; goto error_exit; } postTable = (const POSTTable *) readFontTable(postTag); if (postTable != NULL) { fItalicAngle = Fix2X(SWAPL(postTable->italicAngle)); deleteTable(postTable); } return; error_exit: return; } void XeTeXFontInst::setLayoutDirVertical(bool vertical) { fVertical = vertical; LEErrorCode status = LE_NO_ERROR; initialize(status); } void XeTeXFontInst::deleteTable(const void *table) const { LE_DELETE_ARRAY(table); } const void *XeTeXFontInst::getFontTable(LETag tableTag) const { return FontTableCache::find(tableTag); } const void *XeTeXFontInst::readFontTable(LETag tableTag) const { le_uint32 len; return readTable(tableTag, &len); } const void *XeTeXFontInst::readFontTable(LETag tableTag, le_uint32& len) const { return readTable(tableTag, &len); } CMAPMapper *XeTeXFontInst::findUnicodeMapper() { LETag cmapTag = LE_CMAP_TABLE_TAG; const CMAPTable *cmap = (CMAPTable *) readFontTable(cmapTag); if (cmap == NULL) { return NULL; } return CMAPMapper::createUnicodeMapper(cmap); } le_uint16 XeTeXFontInst::getNumGlyphs() const { if (!fNumGlyphsInited) { LETag maxpTag = LE_MAXP_TABLE_TAG; const MAXPTable *maxpTable = (MAXPTable *) readFontTable(maxpTag); if (maxpTable != NULL) { XeTeXFontInst *realThis = (XeTeXFontInst *) this; realThis->fNumGlyphs = SWAPW(maxpTable->numGlyphs); deleteTable(maxpTable); realThis->fNumGlyphsInited = true; } } return fNumGlyphs; } void XeTeXFontInst::getGlyphAdvance(LEGlyphID glyph, LEPoint &advance) const { TTGlyphID ttGlyph = (TTGlyphID) LE_GET_GLYPH(glyph); if (fMetricsTable == NULL) { // we use the fact that 'hmtx' and 'vmtx' have the same format LETag metricsTag = fVertical ? LE_VMTX_TABLE_TAG : LE_HMTX_TABLE_TAG; XeTeXFontInst *realThis = (XeTeXFontInst *) this; realThis->fMetricsTable = (const HMTXTable *) readFontTable(metricsTag); } le_uint16 index = ttGlyph; if (ttGlyph >= getNumGlyphs() || fMetricsTable == NULL) { advance.fX = advance.fY = 0; return; } if (ttGlyph >= fNumLongMetrics) { index = fNumLongMetrics - 1; } advance.fX = xUnitsToPoints(SWAPW(fMetricsTable->hMetrics[index].advanceWidth)); advance.fY = 0; } le_bool XeTeXFontInst::getGlyphPoint(LEGlyphID glyph, le_int32 pointNumber, LEPoint &point) const { return FALSE; } float XeTeXFontInst::getGlyphWidth(LEGlyphID gid) { LEPoint advance; getGlyphAdvance(gid, advance); return advance.fX; } void XeTeXFontInst::getGlyphHeightDepth(LEGlyphID gid, float* ht, float* dp) { GlyphBBox bbox; getGlyphBounds(gid, &bbox); *ht = bbox.yMax; *dp = -bbox.yMin; } void XeTeXFontInst::getGlyphSidebearings(LEGlyphID gid, float* lsb, float* rsb) { LEPoint adv; getGlyphAdvance(gid, adv); GlyphBBox bbox; getGlyphBounds(gid, &bbox); *lsb = bbox.xMin; *rsb = adv.fX - bbox.xMax; } float XeTeXFontInst::getGlyphItalCorr(LEGlyphID gid) { float rval = 0.0; LEPoint adv; getGlyphAdvance(gid, adv); GlyphBBox bbox; getGlyphBounds(gid, &bbox); if (bbox.xMax > adv.fX) rval = bbox.xMax - adv.fX; return rval; } LEGlyphID XeTeXFontInst::mapGlyphToIndex(const char* glyphName) const /* default implementation, may be overridden (e.g. by Freetype-based XeTeXFontInst_ */ { le_uint32 len; const char *p = (const char*)readFontTable(LE_POST_TABLE_TAG, len); if (p != NULL) return findGlyphInPostTable(p, len, glyphName); else return 0; } const char* XeTeXFontInst::getGlyphName(LEGlyphID gid, int& nameLen) { le_uint32 len; const char *p = (const char*)readFontTable(LE_POST_TABLE_TAG, len); if (p != NULL) { return getGlyphNamePtr(p, len, gid, &nameLen); } } LEUnicode32 XeTeXFontInst::getFirstCharCode() { if (fFirstCharCode == -1) { int ch = 0; while (mapCharToGlyph(ch) == 0 && ch < 0x10ffff) ++ch; fFirstCharCode = ch; } return fFirstCharCode; } LEUnicode32 XeTeXFontInst::getLastCharCode() { if (fLastCharCode == -1) { int ch = 0x10ffff; while (mapCharToGlyph(ch) == 0 && ch > 0) --ch; fLastCharCode = ch; } return fLastCharCode; }