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Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp deleted file mode 100644 index 011e659dc93..00000000000 --- a/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp +++ /dev/null @@ -1,189 +0,0 @@ -/************************************************************************* -** TFM.cpp ** -** ** -** This file is part of dvisvgm -- a fast DVI to SVG converter ** -** Copyright (C) 2005-2021 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 <fstream> -#include <vector> -#include "FileFinder.hpp" -#include "Length.hpp" -#include "Message.hpp" -#include "StreamReader.hpp" -#include "TFM.hpp" - -using namespace std; - - -/** Reads a sequence of n TFM words (4 Bytes each). - * @param[in] reader 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 &reader, vector<T> &v, unsigned n) { - v.clear(); - v.resize(n); - for (unsigned i=0; i < n; i++) - v[i] = reader.readUnsigned(4); -} - - -TFM::TFM (istream &is) : _checksum(0), _firstChar(0), _lastChar(0), _designSize(0), _ascent(0), _descent(0) { - if (!is) - return; - is.seekg(0); - StreamReader reader(is); - uint16_t lf = uint16_t(reader.readUnsigned(2)); // length of entire file in 4 byte words - uint16_t lh = uint16_t(reader.readUnsigned(2)); // length of header in 4 byte words - _firstChar= uint16_t(reader.readUnsigned(2)); // smallest character code in font - _lastChar = uint16_t(reader.readUnsigned(2)); // largest character code in font - uint16_t nw = uint16_t(reader.readUnsigned(2)); // number of words in width table - uint16_t nh = uint16_t(reader.readUnsigned(2)); // number of words in height table - uint16_t nd = uint16_t(reader.readUnsigned(2)); // number of words in depth table - uint16_t ni = uint16_t(reader.readUnsigned(2)); // number of words in italic corr. table - uint16_t nl = uint16_t(reader.readUnsigned(2)); // number of words in lig/kern table - uint16_t nk = uint16_t(reader.readUnsigned(2)); // number of words in kern table - uint16_t ne = uint16_t(reader.readUnsigned(2)); // number of words in ext. char table - uint16_t np = uint16_t(reader.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(reader); - is.seekg(24+lh*4); // move to char info table - readTables(reader, nw, nh, nd, ni); - is.seekg(4*(lf-np), ios::beg); // move to param section - readParameters(reader, np); -} - - -void TFM::readHeader (StreamReader &reader) { - _checksum = reader.readUnsigned(4); - _designSize = double(FixWord(reader.readUnsigned(4)))*Length::pt2bp; -} - - -void TFM::readTables (StreamReader &reader, int nw, int nh, int nd, int ni) { - read_words(reader, _charInfoTable, _lastChar-_firstChar+1); - read_words(reader, _widthTable, nw); - read_words(reader, _heightTable, nh); - read_words(reader, _depthTable, nd); - read_words(reader, _italicTable, ni); - for (FixWord h : _heightTable) - _ascent = max(_ascent, h); - for (FixWord d : _depthTable) - _descent = max(_descent, d); -} - - -/** Read the values from the param section of the TFM file. - * @param[in] reader read from this stream - * @param[in] np number of paramaters to read */ -void TFM::readParameters (StreamReader &reader, int np) { - _params.resize(7); - np = min(np, 7); - for (int i=0; i < np; i++) - _params[i] = reader.readUnsigned(4); - for (int i=np; i < 7; i++) - _params[i] = 0; -} - - -/** Returns the optimal space width between words (in PS point units). */ -double TFM::getSpace () const { - return _params.empty() ? 0 : double(_params[1])*_designSize; -} - - -/** Returns the amount of glue stretching between words (in PS point units). */ -double TFM::getSpaceStretch () const { - return _params.empty() ? 0 : double(_params[2])*_designSize; -} - - -/** Returns the amount of glue shrinking between words (in PS point units). */ -double TFM::getSpaceShrink () const { - return _params.empty() ? 0 : double(_params[3])*_designSize; -} - - -/** Returns the size of one EM unit (in PS point units). */ -double TFM::getQuad () const { - if (_params.empty() || _params[5] == 0) - return _designSize; - return double(_params[5])*_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 double(_widthTable[index]) * _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 double(_heightTable[index]) * _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 double(_depthTable[index]) * _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 double(_italicTable[index]) * _designSize; -} |