diff options
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/TFM.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/TFM.cpp | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/TFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/TFM.cpp new file mode 100644 index 00000000000..d56185d0086 --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.0.9/src/TFM.cpp @@ -0,0 +1,149 @@ +/************************************************************************* +** TFM.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 <fstream> +#include <vector> +#include "FileFinder.h" +#include "Message.h" +#include "StreamReader.h" +#include "TFM.h" + +using namespace std; + + +/** Reads a sequence of n TFM words (4 Bytes each). + * @param[in] is reads from this stream + * @param[out] v the read words + * @param[in] n number of words to be read + * @return dynamically allocated array containing the read words + * (must be deleted by the caller) */ +template <typename T> +static void read_words (StreamReader &sr, vector<T> &v, unsigned n) { + v.clear(); + v.resize(n); + for (unsigned i=0; i < n; i++) + v[i] = sr.readUnsigned(4); +} + + +/** Converts a TFM fix point value to double. */ +static double fix2double (FixWord fix) { + return double(fix)/(1 << 20); +} + + +TFM::TFM () : _checksum(0), _firstChar(0), _lastChar(0), _designSize(0) +{ +} + + +TFM::TFM (istream &is) { + readFromStream(is); +} + + +TFM* TFM::createFromFile (const char *fontname) { + string filename = string(fontname) + ".tfm"; + const char *path = FileFinder::lookup(filename); + ifstream ifs(path, ios_base::binary); + if (ifs) + return new TFM(ifs); + return 0; +} + + +bool TFM::readFromStream (istream &is) { + StreamReader sr(is); + is.seekg(2, ios_base::beg); // skip file size + UInt16 lh = UInt16(sr.readUnsigned(2)); // length of header in 4 byte words + _firstChar= UInt16(sr.readUnsigned(2)); // smalles character code in font + _lastChar = UInt16(sr.readUnsigned(2)); // largest character code in font + UInt16 nw = UInt16(sr.readUnsigned(2)); // number of words in width table + UInt16 nh = UInt16(sr.readUnsigned(2)); // number of words in height table + UInt16 nd = UInt16(sr.readUnsigned(2)); // number of words in depth table + UInt16 ni = UInt16(sr.readUnsigned(2)); // number of words in italic corr. table +// UInt16 nl = UInt16(sr.readUnsigned(2)); // number of words in lig/kern table +// UInt16 nk = UInt16(sr.readUnsigned(2)); // number of words in kern table +// UInt16 ne = UInt16(sr.readUnsigned(2)); // number of words in ext. char table +// UInt16 np = UInt16(sr.readUnsigned(2)); // number of font parameter words + + is.seekg(8, ios_base::cur); // move to header (skip above commented bytes) + _checksum = sr.readUnsigned(4); + _designSize = sr.readUnsigned(4); + is.seekg(24+lh*4, ios_base::beg); // move to char info table + read_words(sr, _charInfoTable, _lastChar-_firstChar+1); + read_words(sr, _widthTable, nw); + read_words(sr, _heightTable, nh); + read_words(sr, _depthTable, nd); + read_words(sr, _italicTable, ni); + return true; +} + + +/** Returns the design size of this font in TeX point units. */ +double TFM::getDesignSize () const { + return fix2double(_designSize); +} + + +// the char info word for each character consists of 4 bytes holding the following information: +// width index w, height index (h), depth index (d), italic correction index (it), +// tag (tg) and a remainder: +// +// byte 1 | byte 2 | byte 3 | byte 4 +// xxxxxxxx | xxxx xxxx | xxxxxx xx | xxxxxxxx +// w | h d | it tg | remainder + +/** Returns the width of char c in TeX point units. */ +double TFM::getCharWidth (int c) const { + if (c < _firstChar || c > _lastChar || unsigned(c-_firstChar) >= _charInfoTable.size()) + return 0; + int index = (_charInfoTable[c-_firstChar] >> 24) & 0xFF; + return fix2double(_widthTable[index]) * fix2double(_designSize); +} + + +/** Returns the height of char c in TeX point units. */ +double TFM::getCharHeight (int c) const { + if (c < _firstChar || c > _lastChar || unsigned(c-_firstChar) >= _charInfoTable.size()) + return 0; + int index = (_charInfoTable[c-_firstChar] >> 20) & 0x0F; + return fix2double(_heightTable[index]) * fix2double(_designSize); +} + + +/** Returns the depth of char c in TeX point units. */ +double TFM::getCharDepth (int c) const { + if (c < _firstChar || c > _lastChar || unsigned(c-_firstChar) >= _charInfoTable.size()) + return 0; + int index = (_charInfoTable[c-_firstChar] >> 16) & 0x0F; + return fix2double(_depthTable[index]) * fix2double(_designSize); +} + + +/** Returns the italic correction of char c in TeX point units. */ +double TFM::getItalicCorr (int c) const { + if (c < _firstChar || c > _lastChar || unsigned(c-_firstChar) >= _charInfoTable.size()) + return 0; + int index = (_charInfoTable[c-_firstChar] >> 10) & 0x3F; + return fix2double(_italicTable[index]) * fix2double(_designSize); +} + |