diff options
author | Akira Kakuto <kakuto@fuk.kindai.ac.jp> | 2016-07-04 22:07:54 +0000 |
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committer | Akira Kakuto <kakuto@fuk.kindai.ac.jp> | 2016-07-04 22:07:54 +0000 |
commit | ab399d16f49b986d1de514b2fb8434872decf91d (patch) | |
tree | 6d3d0faca673d7aa1c0f48ca679ce7841a82e3df /Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp | |
parent | dd2749b37f7b6a9976869e29a028eeab80d686df (diff) |
dvisvgm 1.16
git-svn-id: svn://tug.org/texlive/trunk@41628 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp')
-rw-r--r-- | Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp | 113 |
1 files changed, 74 insertions, 39 deletions
diff --git a/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp b/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp index dbb8658069e..66042f70263 100644 --- a/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp +++ b/Build/source/texk/dvisvgm/dvisvgm-src/src/TFM.cpp @@ -22,6 +22,7 @@ #include <fstream> #include <vector> #include "FileFinder.h" +#include "Length.h" #include "Message.h" #include "StreamReader.h" #include "TFM.h" @@ -30,70 +31,104 @@ 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[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 &sr, vector<T> &v, unsigned n) { +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] = sr.readUnsigned(4); + v[i] = reader.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; +/** Converts a TFM fix point value to double. */ +static inline double fix2double (FixWord fix) { + return double(fix)/(1 << 20); } -TFM::TFM (istream &is) { +TFM::TFM (istream &is) : _checksum(0), _firstChar(0), _lastChar(0), _designSize(0) { + if (!is) + return; 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 + StreamReader reader(is); + UInt16 lf = UInt16(reader.readUnsigned(2)); // length of entire file in 4 byte words + UInt16 lh = UInt16(reader.readUnsigned(2)); // length of header in 4 byte words + _firstChar= UInt16(reader.readUnsigned(2)); // smallest character code in font + _lastChar = UInt16(reader.readUnsigned(2)); // largest character code in font + UInt16 nw = UInt16(reader.readUnsigned(2)); // number of words in width table + UInt16 nh = UInt16(reader.readUnsigned(2)); // number of words in height table + UInt16 nd = UInt16(reader.readUnsigned(2)); // number of words in depth table + UInt16 ni = UInt16(reader.readUnsigned(2)); // number of words in italic corr. table + UInt16 nl = UInt16(reader.readUnsigned(2)); // number of words in lig/kern table + UInt16 nk = UInt16(reader.readUnsigned(2)); // number of words in kern table + UInt16 ne = UInt16(reader.readUnsigned(2)); // number of words in ext. char table + UInt16 np = UInt16(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(sr); + readHeader(reader); is.seekg(24+lh*4); // move to char info table - readTables(sr, nw, nh, nd, ni); + readTables(reader, nw, nh, nd, ni); + is.seekg(4*(lf-np), ios::beg); // move to param section + readParameters(reader, np); } -void TFM::readHeader (StreamReader &sr) { - _checksum = sr.readUnsigned(4); - _designSize = sr.readUnsigned(4); +void TFM::readHeader (StreamReader &reader) { + _checksum = reader.readUnsigned(4); + _designSize = fix2double(reader.readUnsigned(4))*Length::pt2bp; } -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); +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); } -/** Returns the design size of this font in PS point units. */ -double TFM::getDesignSize () const { - return fix2double(_designSize); +/** 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 : fix2double(_params[1])*_designSize; +} + + +/** Returns the amount of glue stretching between words (in PS point units). */ +double TFM::getSpaceStretch () const { + return _params.empty() ? 0 : fix2double(_params[2])*_designSize; +} + + +/** Returns the amount of glue shrinking between words (in PS point units). */ +double TFM::getSpaceShrink () const { + return _params.empty() ? 0 : fix2double(_params[3])*_designSize; +} + + +/** Returns the size of one EM unit (in PS point units). */ +double TFM::getQuad () const { + return _params.empty() ? 0 : fix2double(_params[5])*_designSize; } @@ -121,7 +156,7 @@ double TFM::getCharWidth (int c) const { if (index < 0) return 0; index = (_charInfoTable[index] >> 24) & 0xFF; - return fix2double(_widthTable[index]) * fix2double(_designSize); + return fix2double(_widthTable[index]) * _designSize; } @@ -131,7 +166,7 @@ double TFM::getCharHeight (int c) const { if (index < 0) return 0; index = (_charInfoTable[index] >> 20) & 0x0F; - return fix2double(_heightTable[index]) * fix2double(_designSize); + return fix2double(_heightTable[index]) * _designSize; } @@ -141,7 +176,7 @@ double TFM::getCharDepth (int c) const { if (index < 0) return 0; index = (_charInfoTable[index] >> 16) & 0x0F; - return fix2double(_depthTable[index]) * fix2double(_designSize); + return fix2double(_depthTable[index]) * _designSize; } @@ -151,5 +186,5 @@ double TFM::getItalicCorr (int c) const { if (index < 0) return 0; index = (_charInfoTable[index] >> 10) & 0x3F; - return fix2double(_italicTable[index]) * fix2double(_designSize); + return fix2double(_italicTable[index]) * _designSize; } |