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// TeXFont_TFM.cpp
//
// Part of KDVI - A DVI previewer for the KDE desktop environemt
//
// (C) 2003 Stefan Kebekus
// Distributed under the GPL
// Add header files alphabetically
#include <config.h>
#include <kdebug.h>
#include <klocale.h>
#include <qdatastream.h>
#include <qfile.h>
#include "glyph.h"
#include "TeXFont_TFM.h"
#include "TeXFontDefinition.h"
//#define DEBUG_TFM
TeXFont_TFM::TeXFont_TFM(TeXFontDefinition *parent)
: TeXFont(parent)
{
#ifdef DEBUG_TFM
kdDebug(4300) << "TeXFont_TFM::TeXFont_TFM( parent=" << parent << " )" << endl;
#endif
QFile file( parent->filename );
if ( !file.open( IO_ReadOnly ) ) {
kdError(4300) << "TeXFont_TFM::TeXFont_TFM(): Could not read TFM file" << endl;
return;
}
QDataStream stream( &file );
// Data from the very beginning of the TFM file, as specified in
// "The DVI Driver Standard, Level 0", section D.2.1
Q_UINT16 lf, lh, bc, ec, nw, nh, nd;
stream >> lf >> lh >> bc >> ec >> nw >> nh >> nd;
#ifdef DEBUG_TFM
kdDebug(4300) << "lf= " << lf << endl
<< "lh= " << lh << endl
<< "bc= " << bc << endl
<< "ec= " << ec << endl
<< "nw= " << nw << endl
<< "nh= " << nh << endl
<< "nd= " << nd << endl;
#endif
if ((bc > ec) || (ec >= TeXFontDefinition::max_num_of_chars_in_font)) {
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid bc and ec entries." << endl;
file.close();
return;
}
// Data from the HEADER section of the TFM data.
file.at(24);
stream >> checksum >> design_size_in_TeX_points.value;
#ifdef DEBUG_TFM
kdDebug(4300) << "checksum = " << checksum << endl
<< "design_size = " << design_size_in_TeX_points.toDouble() << " TeX Points" << endl
<< " = " << design_size_in_TeX_points.toDouble()*254.0/7227.0 << " cm" << endl;
#endif
// Width table
fix_word widthTable_in_units_of_design_size[TeXFontDefinition::max_num_of_chars_in_font];
for(unsigned int i=0; i<TeXFontDefinition::max_num_of_chars_in_font; i++)
widthTable_in_units_of_design_size[i].value = 0;
file.at( 24 + 4*lh + 4*(ec-bc) );
for(unsigned int i=0; i<nw; i++) {
stream >> widthTable_in_units_of_design_size[i].value;
// Some characters, which are used as parts of glyphs, have width
// 0 --the real width is caculated in a lig_kern program and
// depends on the preceding character. We cannot calculate the
// real width here and take 0.4 times the design size as an
// approximation.
if (widthTable_in_units_of_design_size[i].value == 0)
widthTable_in_units_of_design_size[i].fromDouble(0.4);
}
// Height table
fix_word heightTable_in_units_of_design_size[16];
for(unsigned int i=0; i<16; i++)
heightTable_in_units_of_design_size[i].value = 0;
for(unsigned int i=0; i<nh; i++) {
stream >> heightTable_in_units_of_design_size[i].value;
}
// Char-Info table
file.at( 24 + 4*lh );
for(unsigned int characterCode=bc; characterCode<ec; characterCode++) {
glyph *g = glyphtable+characterCode;
Q_UINT8 byte;
stream >> byte;
if (byte >= nw)
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
else {
characterWidth_in_units_of_design_size[characterCode] = widthTable_in_units_of_design_size[byte];
g->dvi_advance_in_units_of_design_size_by_2e20 = widthTable_in_units_of_design_size[byte].value;
}
stream >> byte;
byte = byte >> 4;
if (byte >= nh)
kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
else
characterHeight_in_units_of_design_size[characterCode] = heightTable_in_units_of_design_size[byte];
stream >> byte;
stream >> byte;
}
file.close();
}
TeXFont_TFM::~TeXFont_TFM()
{
}
glyph *TeXFont_TFM::getGlyph(Q_UINT16 characterCode, bool generateCharacterPixmap, const QColor& color)
{
#ifdef DEBUG_TFM
kdDebug(4300) << "TeXFont_TFM::getGlyph( ch=" << ch << ", generateCharacterPixmap=" << generateCharacterPixmap << " )" << endl;
#endif
// Paranoia checks
if (characterCode >= TeXFontDefinition::max_num_of_chars_in_font) {
kdError(4300) << "TeXFont_TFM::getGlyph(): Argument is too big." << endl;
return glyphtable;
}
// This is the address of the glyph that will be returned.
struct glyph *g = glyphtable+characterCode;
if ((generateCharacterPixmap == true) && ((g->shrunkenCharacter.isNull()) || (color != g->color)) ) {
g->color = color;
Q_UINT16 pixelWidth = (Q_UINT16)(parent->displayResolution_in_dpi *
design_size_in_TeX_points.toDouble() *
characterWidth_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
Q_UINT16 pixelHeight = (Q_UINT16)(parent->displayResolution_in_dpi *
design_size_in_TeX_points.toDouble() *
characterHeight_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
// Just make sure that weired TFM files never lead to giant
// pixmaps that eat all system memory...
if (pixelWidth > 50)
pixelWidth = 50;
if (pixelHeight > 50)
pixelHeight = 50;
g->shrunkenCharacter.resize( pixelWidth, pixelHeight );
g->shrunkenCharacter.fill(color);
g->x2 = 0;
g->y2 = pixelHeight;
}
return g;
}
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