summaryrefslogtreecommitdiff
path: root/dviware/dvisvgm/src/OFM.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'dviware/dvisvgm/src/OFM.hpp')
-rw-r--r--dviware/dvisvgm/src/OFM.hpp135
1 files changed, 135 insertions, 0 deletions
diff --git a/dviware/dvisvgm/src/OFM.hpp b/dviware/dvisvgm/src/OFM.hpp
new file mode 100644
index 0000000000..560bc1f634
--- /dev/null
+++ b/dviware/dvisvgm/src/OFM.hpp
@@ -0,0 +1,135 @@
+/*************************************************************************
+** OFM.hpp **
+** **
+** This file is part of dvisvgm -- a fast DVI to SVG converter **
+** Copyright (C) 2005-2023 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/>. **
+*************************************************************************/
+
+#ifndef OFM_HPP
+#define OFM_HPP
+
+#include <vector>
+#include "FixWord.hpp"
+#include "FontMetrics.hpp"
+#include "StreamReader.hpp"
+
+class OFM : public FontMetrics {
+ public:
+ virtual int level () const =0;
+ bool isOFM () const override {return true;}
+ uint32_t getChecksum () const override {return _checksum;}
+ uint32_t firstChar () const override {return _firstChar;}
+ uint32_t lastChar () const override {return _lastChar;}
+ bool verticalLayout () const override {return _vertical;}
+ double getDesignSize () const override {return _designSize;}
+ double getAscent () const override {return double(_ascent)*_designSize;}
+ double getDescent () const override {return double(_descent)*_designSize;}
+ double getCharWidth (int c) const override;
+ double getCharHeight (int c) const override;
+ double getCharDepth (int c) const override;
+ double getItalicCorr (int c) const override;
+ double getSpace () const override;
+ double getSpaceStretch () const override;
+ double getSpaceShrink () const override;
+ double getQuad () const override;
+ using FontMetrics::read;
+
+ protected:
+ struct FileDimensions {
+ uint32_t lf=0; // length of file in 4-byte words
+ uint32_t lh=0; // length of header data in 4-byte words
+ uint32_t bc=0; // smallest character code
+ uint32_t ec=0; // largest character code
+ uint32_t nw=0; // number of width entries
+ uint32_t nh=0; // number of height entries
+ uint32_t nd=0; // number of depth entries
+ uint32_t ni=0; // number of italic correction entries
+ uint32_t nl=0; // number of lig-kern entries
+ uint32_t nk=0; // number of kern entries
+ uint32_t ne=0; // number of extensible character entries
+ uint32_t np=0; // number of font parameter words
+ uint32_t dir=0; // writing direction of font
+ void read (StreamReader &reader);
+ };
+
+ FileDimensions read (std::istream &is, uint32_t maxNumWidths);
+ void readHeader (StreamReader &reader);
+ void readTables (StreamReader &reader, const FileDimensions &dim);
+ size_t charIndex (int c) const;
+ virtual size_t numCharInfos () const =0;
+ virtual size_t widthIndex (size_t n) const =0;
+ virtual size_t heightIndex (size_t n) const =0;
+ virtual size_t depthIndex (size_t n) const =0;
+ virtual size_t italicIndex (size_t n) const =0;
+
+ protected:
+ uint32_t _checksum=0;
+ uint32_t _firstChar=0, _lastChar=0;
+ double _designSize=0; ///< design size of the font in PS points (72bp = 1in)
+ std::vector<FixWord> _widthTable; ///< character widths in design size units
+ std::vector<FixWord> _heightTable; ///< character height in design size units
+ std::vector<FixWord> _depthTable; ///< character depth in design size units
+ std::vector<FixWord> _italicTable; ///< italic corrections in design size units
+ std::vector<FixWord> _params; ///< values of the OFM's param section
+ FixWord _ascent=0, _descent=0; ///< max. height and depth
+ bool _vertical=false; ///< true if metrics refer to vertical text layout
+};
+
+
+class OFM0 : public OFM {
+ public:
+ void read (std::istream &is) override;
+ int level () const override {return 0;}
+
+ protected:
+ void readCharInfos (StreamReader &reader);
+ size_t numCharInfos () const override {return _charInfos.size();}
+ size_t widthIndex (size_t n) const override {return (_charInfos[n] >> 48) & 0xFFFF;}
+ size_t heightIndex (size_t n) const override {return (_charInfos[n] >> 40) & 0xFF;}
+ size_t depthIndex (size_t n) const override {return (_charInfos[n] >> 32) & 0xFF;}
+ size_t italicIndex (size_t n) const override {return (_charInfos[n] >> 24) & 0xFF;}
+
+ private:
+ std::vector<uint64_t> _charInfos;
+};
+
+
+class OFM1 : public OFM {
+ struct CharInfo {
+ uint16_t widthIndex=0;
+ uint8_t heightIndex=0;
+ uint8_t depthIndex=0;
+ uint8_t italicIndex=0;
+ };
+ public:
+ void read (std::istream &is) override;
+ int level () const override {return 1;}
+
+ protected:
+ void readCharInfos (StreamReader &reader);
+ size_t numCharInfos () const override {return _charInfos.size();}
+ size_t widthIndex (size_t n) const override {return _charInfos[n].widthIndex;}
+ size_t heightIndex (size_t n) const override {return _charInfos[n].heightIndex;}
+ size_t depthIndex (size_t n) const override {return _charInfos[n].depthIndex;}
+ size_t italicIndex (size_t n) const override {return _charInfos[n].italicIndex;}
+
+ private:
+ uint32_t _ncw=0;
+ uint32_t _npc=0;
+ std::vector<CharInfo> _charInfos;
+};
+
+#endif