mirror of
https://invent.kde.org/graphics/okular
synced 2024-08-25 10:55:37 +00:00
162 lines
5.3 KiB
C++
162 lines
5.3 KiB
C++
// TeXFont_TFM.cpp
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//
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// Part of KDVI - A DVI previewer for the KDE desktop environemt
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//
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// (C) 2003 Stefan Kebekus
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// Distributed under the GPL
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// Add header files alphabetically
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#include <kdebug.h>
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#include <klocale.h>
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#include <qdatastream.h>
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#include <qfile.h>
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#include "glyph.h"
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#include "TeXFont_TFM.h"
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#include "TeXFontDefinition.h"
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//#define DEBUG_TFM
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TeXFont_TFM::TeXFont_TFM(TeXFontDefinition *parent)
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: TeXFont(parent)
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{
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#ifdef DEBUG_TFM
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kdDebug(4300) << "TeXFont_TFM::TeXFont_TFM( parent=" << parent << " )" << endl;
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#endif
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QFile file( parent->filename );
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if ( !file.open( IO_ReadOnly ) ) {
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kdError(4300) << "TeXFont_TFM::TeXFont_TFM(): Could not read TFM file" << endl;
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return;
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}
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QDataStream stream( &file );
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// Data from the very beginning of the TFM file, as specified in
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// "The DVI Driver Standard, Level 0", section D.2.1
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Q_UINT16 lf, lh, bc, ec, nw, nh, nd;
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stream >> lf >> lh >> bc >> ec >> nw >> nh >> nd;
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#ifdef DEBUG_TFM
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kdDebug(4300) << "lf= " << lf << endl
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<< "lh= " << lh << endl
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<< "bc= " << bc << endl
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<< "ec= " << ec << endl
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<< "nw= " << nw << endl
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<< "nh= " << nh << endl
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<< "nd= " << nd << endl;
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#endif
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if ((bc > ec) || (ec >= TeXFontDefinition::max_num_of_chars_in_font)) {
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kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid bc and ec entries." << endl;
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file.close();
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return;
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}
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// Data from the HEADER section of the TFM data.
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file.at(24);
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stream >> checksum >> design_size_in_TeX_points.value;
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#ifdef DEBUG_TFM
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kdDebug(4300) << "checksum = " << checksum << endl
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<< "design_size = " << design_size_in_TeX_points.toDouble() << " TeX Points" << endl
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<< " = " << design_size_in_TeX_points.toDouble()*254.0/7227.0 << " cm" << endl;
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#endif
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// Width table
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fix_word widthTable_in_units_of_design_size[TeXFontDefinition::max_num_of_chars_in_font];
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for(unsigned int i=0; i<TeXFontDefinition::max_num_of_chars_in_font; i++)
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widthTable_in_units_of_design_size[i].value = 0;
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file.at( 24 + 4*lh + 4*(ec-bc) );
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for(unsigned int i=0; i<nw; i++) {
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stream >> widthTable_in_units_of_design_size[i].value;
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// Some characters, which are used as parts of glyphs, have width
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// 0 --the real width is caculated in a lig_kern program and
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// depends on the preceding character. We cannot calculate the
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// real width here and take 0.4 times the design size as an
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// approximation.
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if (widthTable_in_units_of_design_size[i].value == 0)
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widthTable_in_units_of_design_size[i].fromDouble(0.4);
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}
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// Height table
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fix_word heightTable_in_units_of_design_size[16];
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for(unsigned int i=0; i<16; i++)
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heightTable_in_units_of_design_size[i].value = 0;
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for(unsigned int i=0; i<nh; i++) {
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stream >> heightTable_in_units_of_design_size[i].value;
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}
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// Char-Info table
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file.at( 24 + 4*lh );
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for(unsigned int characterCode=bc; characterCode<ec; characterCode++) {
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glyph *g = glyphtable+characterCode;
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Q_UINT8 byte;
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stream >> byte;
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if (byte >= nw)
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kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
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else {
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characterWidth_in_units_of_design_size[characterCode] = widthTable_in_units_of_design_size[byte];
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g->dvi_advance_in_units_of_design_size_by_2e20 = widthTable_in_units_of_design_size[byte].value;
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}
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stream >> byte;
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byte = byte >> 4;
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if (byte >= nh)
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kdError(4300) << "TeXFont_TFM::TeXFont_TFM( filename=" << parent->filename << " ): The font has an invalid Char-Info table." << endl;
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else
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characterHeight_in_units_of_design_size[characterCode] = heightTable_in_units_of_design_size[byte];
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stream >> byte;
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stream >> byte;
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}
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file.close();
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}
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TeXFont_TFM::~TeXFont_TFM()
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{
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}
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glyph *TeXFont_TFM::getGlyph(Q_UINT16 characterCode, bool generateCharacterPixmap, QColor color)
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{
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#ifdef DEBUG_TFM
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kdDebug(4300) << "TeXFont_TFM::getGlyph( ch=" << ch << ", generateCharacterPixmap=" << generateCharacterPixmap << " )" << endl;
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#endif
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// Paranoia checks
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if (characterCode >= TeXFontDefinition::max_num_of_chars_in_font) {
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kdError(4300) << "TeXFont_TFM::getGlyph(): Argument is too big." << endl;
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return glyphtable;
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}
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// This is the address of the glyph that will be returned.
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struct glyph *g = glyphtable+characterCode;
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if ((generateCharacterPixmap == true) && ((g->shrunkenCharacter.isNull()) || (color != g->color)) ) {
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g->color = color;
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Q_UINT16 pixelWidth = (Q_UINT16)(parent->displayResolution_in_dpi *
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design_size_in_TeX_points.toDouble() *
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characterWidth_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
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Q_UINT16 pixelHeight = (Q_UINT16)(parent->displayResolution_in_dpi *
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design_size_in_TeX_points.toDouble() *
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characterHeight_in_units_of_design_size[characterCode].toDouble() * 100.0/7227.0 + 0.5);
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// Just make sure that weired TFM files never lead to giant
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// pixmaps that eat all system memory...
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if (pixelWidth > 50)
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pixelWidth = 50;
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if (pixelHeight > 50)
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pixelHeight = 50;
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g->shrunkenCharacter.resize( pixelWidth, pixelHeight );
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g->shrunkenCharacter.fill(color);
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g->x2 = 0;
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g->y2 = pixelHeight;
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}
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return g;
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}
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