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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-1.11/src/TFM.cpp')
| -rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-1.11/src/TFM.cpp | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-1.11/src/TFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-1.11/src/TFM.cpp new file mode 100644 index 00000000000..6e3ad81eb9a --- /dev/null +++ b/Build/source/texk/dvisvgm/dvisvgm-1.11/src/TFM.cpp @@ -0,0 +1,156 @@ +/************************************************************************* +** TFM.cpp ** +** ** +** This file is part of dvisvgm -- the DVI to SVG converter ** +** Copyright (C) 2005-2015 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 <config.h> +#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] sr the TFM data is read from this object + * @param[out] v the read words + * @param[in] n number of words to be read */ +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 (PS point units). */ +static double fix2double (FixWord fix) { + const double pt2bp = 72/72.27; + return double(fix)/(1 << 20)*pt2bp; +} + + +TFM::TFM (istream &is) { + is.seekg(0); + StreamReader sr(is); + UInt16 lf = UInt16(sr.readUnsigned(2)); // length of entire file in 4 byte words + UInt16 lh = UInt16(sr.readUnsigned(2)); // length of header in 4 byte words + _firstChar= UInt16(sr.readUnsigned(2)); // smallest 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 + + if (6+lh+(_lastChar-_firstChar+1)+nw+nh+nd+ni+nl+nk+ne+np != lf) + throw FontMetricException("inconsistent length values"); + if (_firstChar >= _lastChar || _lastChar > 255 || ne > 256) + throw FontMetricException("character codes out of range"); + + readHeader(sr); + is.seekg(24+lh*4); // move to char info table + readTables(sr, nw, nh, nd, ni); +} + + +void TFM::readHeader (StreamReader &sr) { + _checksum = sr.readUnsigned(4); + _designSize = sr.readUnsigned(4); +} + + +void TFM::readTables (StreamReader &sr, int nw, int nh, int nd, int ni) { + 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); +} + + +/** Returns the design size of this font in PS point units. */ +double TFM::getDesignSize () const { + return fix2double(_designSize); +} + + +/** Returns the index to the entry of the character info table that describes the metric of a given character. + * @param[in] c character whose index is retrieved + * @return table index for character c, or -1 if there's no entry */ +int TFM::charIndex (int c) const { + if (c < _firstChar || c > _lastChar || size_t(c-_firstChar) >= _charInfoTable.size()) + return -1; + return c-_firstChar; +} + + +// 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 PS point units. */ +double TFM::getCharWidth (int c) const { + int index = charIndex(c); + if (index < 0) + return 0; + index = (_charInfoTable[index] >> 24) & 0xFF; + return fix2double(_widthTable[index]) * fix2double(_designSize); +} + + +/** Returns the height of char c in PS point units. */ +double TFM::getCharHeight (int c) const { + int index = charIndex(c); + if (index < 0) + return 0; + index = (_charInfoTable[index] >> 20) & 0x0F; + return fix2double(_heightTable[index]) * fix2double(_designSize); +} + + +/** Returns the depth of char c in PS point units. */ +double TFM::getCharDepth (int c) const { + int index = charIndex(c); + if (index < 0) + return 0; + index = (_charInfoTable[index] >> 16) & 0x0F; + return fix2double(_depthTable[index]) * fix2double(_designSize); +} + + +/** Returns the italic correction of char c in PS point units. */ +double TFM::getItalicCorr (int c) const { + int index = charIndex(c); + if (index < 0) + return 0; + index = (_charInfoTable[index] >> 10) & 0x3F; + return fix2double(_italicTable[index]) * fix2double(_designSize); +} |