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+/*************************************************************************
+** FontEngine.cpp **
+** **
+** This file is part of dvisvgm -- the DVI to SVG converter **
+** Copyright (C) 2005-2011 Martin Gieseking <martin.gieseking@uos.de> **
+** **
+** This program is free software; you can redistribute it and/or **
+** modify it under the terms of the GNU General Public License as **
+** published by the Free Software Foundation; either version 3 of **
+** the License, or (at your option) any later version. **
+** **
+** This program is distributed in the hope that it will be useful, but **
+** WITHOUT ANY WARRANTY; without even the implied warranty of **
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
+** GNU General Public License for more details. **
+** **
+** You should have received a copy of the GNU General Public License **
+** along with this program; if not, see <http://www.gnu.org/licenses/>. **
+*************************************************************************/
+
+#include <iostream>
+#include <sstream>
+#include <ft2build.h>
+#include FT_GLYPH_H
+#include FT_OUTLINE_H
+#include FT_TRUETYPE_TABLES_H
+#include "Font.h"
+#include "FontEngine.h"
+#include "Message.h"
+#include "macros.h"
+
+using namespace std;
+
+
+FontEngine::FontEngine () {
+ _currentFace = 0;
+ _currentChar = _currentGlyphIndex = 0;
+ _horDeviceRes = _vertDeviceRes = 300;
+ _ptSize = 0;
+ if (FT_Init_FreeType(&_library))
+ Message::estream(true) << "FontEngine: error initializing FreeType library\n";
+}
+
+
+FontEngine::~FontEngine () {
+ if (_currentFace && FT_Done_Face(_currentFace))
+ Message::estream(true) << "FontEngine: error removing glyph\n";
+ if (FT_Done_FreeType(_library))
+ Message::estream(true) << "FontEngine: error removing FreeType library\n";
+}
+
+
+/** Returns the singleton instance of this class. */
+FontEngine& FontEngine::instance () {
+ static FontEngine engine;
+ return engine;
+}
+
+
+string FontEngine::version () {
+ FT_Int major, minor, patch;
+ FT_Library &lib = instance()._library;
+ FT_Library_Version(lib, &major, &minor, &patch);
+ ostringstream oss;
+ oss << major << '.' << minor << '.' << patch;
+ return oss.str();
+}
+
+
+void FontEngine::setDeviceResolution (int x, int y) {
+ _horDeviceRes = x;
+ _vertDeviceRes = y;
+}
+
+
+/** Builds a table that maps glyph indexes to char codes.
+ * @param[in] face font face to be used
+ * @param[out] reverseMap the resulting map */
+static void build_reverse_map (FT_Face face, map<UInt32, UInt32> &reverseMap) {
+ FT_UInt glyphIndex;
+ UInt32 charcode = FT_Get_First_Char(face, &glyphIndex);
+ while (glyphIndex) {
+// if (reverseMap.find(glyphIndex) == reverseMap.end())
+ reverseMap[glyphIndex] = charcode;
+ charcode = FT_Get_Next_Char(face, charcode, &glyphIndex);
+ }
+}
+
+
+/** Sets the font to be used.
+ * @param[in] fname path to font file
+ * @param[in] ptSize font size in point units
+ * @return true on success */
+bool FontEngine::setFont (const string &fname, int ptSize) {
+ if (FT_New_Face(_library, fname.c_str(), 0, &_currentFace)) {
+ Message::estream(true) << "FontEngine: error reading file " << fname << '\n';
+ return false;
+ }
+ if (ptSize && FT_Set_Char_Size(_currentFace, 0, ptSize*64, _horDeviceRes, _vertDeviceRes)) {
+ Message::estream(true) << "FontEngine: error setting character size\n";
+ return false;
+ }
+ // look for a custom character map
+ for (int i=0; i < _currentFace->num_charmaps; i++) {
+ FT_CharMap charmap = _currentFace->charmaps[i];
+ if (charmap->encoding == FT_ENCODING_ADOBE_CUSTOM) {
+ FT_Set_Charmap(_currentFace, charmap);
+ break;
+ }
+ }
+ _ptSize = ptSize;
+ return true;
+}
+
+
+bool FontEngine::setFont (const Font &font) {
+ if (fname != font.name()) {
+ fname = font.name();
+ return setFont(font.path());
+ }
+ return true;
+}
+
+
+void FontEngine::buildTranslationMap (map<UInt32, UInt32> &translationMap) const {
+ FT_CharMap unicodeMap=0, customMap=0;
+ for (int i=0; i < _currentFace->num_charmaps; i++) {
+ FT_CharMap charmap = _currentFace->charmaps[i];
+ if (charmap->encoding == FT_ENCODING_ADOBE_CUSTOM)
+ customMap = charmap;
+ else if (charmap->encoding == FT_ENCODING_UNICODE)
+ unicodeMap = charmap;
+ }
+ if (unicodeMap == 0 || customMap == 0)
+ return;
+
+ map<UInt32,UInt32> reverseMap;
+ build_reverse_map(_currentFace, reverseMap);
+
+ FT_Set_Charmap(_currentFace, unicodeMap);
+ FT_UInt glyphIndex;
+ UInt32 charcode = FT_Get_First_Char(_currentFace, &glyphIndex);
+ while (glyphIndex) {
+ translationMap[reverseMap[glyphIndex]] = charcode;
+ charcode = FT_Get_Next_Char(_currentFace, charcode, &glyphIndex);
+ }
+ FT_Set_Charmap(_currentFace, customMap);
+}
+
+
+const char* FontEngine::getFamilyName () const {
+ return _currentFace ? _currentFace->family_name : 0;
+}
+
+
+const char* FontEngine::getStyleName () const {
+ return _currentFace ? _currentFace->style_name : 0;
+}
+
+
+int FontEngine::getUnitsPerEM () const {
+ return _currentFace ? _currentFace->units_per_EM : 0;
+}
+
+
+int FontEngine::getAscender () const {
+ return _currentFace ? _currentFace->ascender : 0;
+}
+
+
+int FontEngine::getDescender () const {
+ return _currentFace ? _currentFace->descender : 0;
+}
+
+
+int FontEngine::getHAdvance () const {
+ if (_currentFace) {
+ TT_OS2 *table = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(_currentFace, ft_sfnt_os2));
+ return table ? table->xAvgCharWidth : 0;
+ }
+ return 0;
+}
+
+
+int FontEngine::getHAdvance (unsigned c) const {
+ if (_currentFace) {
+ int index = FT_Get_Char_Index(_currentFace, (FT_ULong)c);
+ FT_Load_Glyph(_currentFace, index, FT_LOAD_NO_SCALE);
+ return _currentFace->glyph->metrics.horiAdvance;
+ }
+ return 0;
+}
+
+
+int FontEngine::getHAdvance (const char *name) const {
+ if (_currentFace && name) {
+ int index = FT_Get_Name_Index(_currentFace, (FT_String*)name);
+ FT_Load_Glyph(_currentFace, index, FT_LOAD_NO_SCALE);
+ return _currentFace->glyph->metrics.horiAdvance;
+ }
+ return 0;
+}
+
+
+/** Get first available character of the current font face. */
+int FontEngine::getFirstChar () const {
+ if (_currentFace)
+ return _currentChar = FT_Get_First_Char(_currentFace, &_currentGlyphIndex);
+ return 0;
+}
+
+
+/** Get the next available character of the current font face. */
+int FontEngine::getNextChar () const {
+ if (_currentFace && _currentGlyphIndex)
+ return _currentChar = FT_Get_Next_Char(_currentFace, _currentChar, &_currentGlyphIndex);
+ return getFirstChar();
+}
+
+
+/** Returns the glyph name for a given charater code.
+ * @param[in] c char code
+ * @return glyph name */
+string FontEngine::getGlyphName (unsigned c) const {
+ if (_currentFace && FT_HAS_GLYPH_NAMES(_currentFace)) {
+ char buf[256];
+ int index = FT_Get_Char_Index(_currentFace, c);
+ FT_Get_Glyph_Name(_currentFace, index, buf, 256);
+ return string(buf);
+ }
+ return "";
+}
+
+
+/* Returns the character code for a given glyph name.
+ * @param name glyph name
+ * @return char code or 0 if name couldn't be found
+int FontEngine::getCharByGlyphName (const char *name) const {
+ if (_currentFace && FT_HAS_GLYPH_NAMES(_currentFace)) {
+ int index = FT_Get_Name_Index(_currentFace, (FT_String*)name);
+ map<UInt32, UInt32>::const_iterator it = _reverseMap.find(index);
+ if (it != _reverseMap.end())
+ return it->second;
+ }
+ return 0;
+}*/
+
+
+vector<int> FontEngine::getPanose () const {
+ vector<int> panose(10);
+ if (_currentFace) {
+ TT_OS2 *table = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(_currentFace, ft_sfnt_os2));
+ if (table)
+ for (int i=0; i < 10; i++)
+ panose[i] = table->panose[i];
+ }
+ return panose;
+}
+
+
+bool FontEngine::setCharSize (int ptSize) {
+ if (_currentFace) {
+ if (FT_Set_Char_Size(_currentFace, 0, ptSize*64, _horDeviceRes, _vertDeviceRes)) {
+ Message::estream(true) << "FontEngine: error setting character size\n";
+ return false;
+ }
+ _ptSize = ptSize;
+ return true;
+ }
+ Message::wstream(true) << "FontEngine: can't set char size, no font face selected\n";
+ return false;
+}
+
+
+// handle API change in freetype version 2.2.1
+#if FREETYPE_MAJOR > 2 || (FREETYPE_MAJOR == 2 && (FREETYPE_MINOR > 2 || (FREETYPE_MINOR == 2 && FREETYPE_PATCH >= 1)))
+ typedef const FT_Vector *FTVectorPtr;
+#else
+ typedef FT_Vector *FTVectorPtr;
+#endif
+
+// Callback functions used by traceOutline
+static int moveto (FTVectorPtr to, void *user) {
+ Glyph *glyph = static_cast<Glyph*>(user);
+ glyph->moveto(to->x, to->y);
+ return 0;
+}
+
+
+static int lineto (FTVectorPtr to, void *user) {
+ Glyph *glyph = static_cast<Glyph*>(user);
+ glyph->lineto(to->x, to->y);
+ return 0;
+}
+
+
+static int conicto (FTVectorPtr control, FTVectorPtr to, void *user) {
+ Glyph *glyph = static_cast<Glyph*>(user);
+ glyph->conicto(control->x, control->y, to->x, to->y);
+ return 0;
+}
+
+
+static int cubicto (FTVectorPtr control1, FTVectorPtr control2, FTVectorPtr to, void *user) {
+ Glyph *glyph = static_cast<Glyph*>(user);
+ glyph->cubicto(control1->x, control1->y, control2->x, control2->y, to->x, to->y);
+ return 0;
+}
+
+
+/** Traces the outline of a glyph by calling the corresponding "drawing" functions.
+ * Each glyph is composed of straight lines, quadratic (conic) or cubic B�zier curves.
+ * This function takes all these outline segments and processes them by calling
+ * the corresponding functions. The functions must be provided in form of a
+ * FEGlyphCommands object.
+ * @param[in] index index of the glyph that will be traced
+ * @param[in] commands the drawing commands to be executed
+ * @param[in] scale if true the current pt size will be considered otherwise the plain TrueType units are used.
+ * @return false on errors */
+static bool trace_outline (FT_Face face, int index, Glyph &glyph, bool scale) {
+ if (face) {
+ if (FT_Load_Glyph(face, index, scale ? FT_LOAD_DEFAULT : FT_LOAD_NO_SCALE)) {
+ Message::estream(true) << "can't load glyph " << int(index) << '\n';
+ return false;
+ }
+
+ if (face->glyph->format != FT_GLYPH_FORMAT_OUTLINE) {
+ Message::estream(true) << "no outlines found in glyph " << int(index) << '\n';
+ return false;
+ }
+ FT_Outline outline = face->glyph->outline;
+ const FT_Outline_Funcs funcs = {moveto, lineto, conicto, cubicto, 0, 0};
+ FT_Outline_Decompose(&outline, &funcs, &glyph);
+ return true;
+ }
+ Message::wstream(true) << "FontEngine: can't trace outline, no font face selected\n";
+ return false;
+}
+
+
+
+/** Traces the outline of a glyph by calling the corresponding "drawing" functions.
+ * Each glyph is composed of straight lines, quadratic (conic) or cubic B�zier curves.
+ * This function takes all these outline segments and processes them by calling
+ * the corresponding functions. The functions must be provided in form of a
+ * FEGlyphCommands object.
+ * @param[in] chr the glyph of this character will be traced
+ * @param[in] commands the drawing commands to be executed
+ * @param[in] scale if true the current pt size will be considered otherwise
+ * the plain TrueType units are used.
+ * @return false on errors */
+bool FontEngine::traceOutline (unsigned char chr, Glyph &glyph, bool scale) const {
+ if (_currentFace) {
+ int index = FT_Get_Char_Index(_currentFace, chr);
+ return trace_outline(_currentFace, index, glyph, scale);
+ }
+ Message::wstream(true) << "FontEngine: can't trace outline, no font face selected\n";
+ return false;
+}
+
+
+bool FontEngine::traceOutline (const char *name, Glyph &glyph, bool scale) const {
+ if (_currentFace) {
+ int index = FT_Get_Name_Index(_currentFace, (FT_String*)name);
+ return trace_outline(_currentFace, index, glyph, scale);
+ }
+ Message::wstream(true) << "FontEngine: can't trace outline, no font face selected\n";
+ return false;
+}