diff options
Diffstat (limited to 'kdvi/TeXFont_TFM.cpp')
| -rw-r--r-- | kdvi/TeXFont_TFM.cpp | 163 |
1 files changed, 163 insertions, 0 deletions
diff --git a/kdvi/TeXFont_TFM.cpp b/kdvi/TeXFont_TFM.cpp new file mode 100644 index 00000000..54edd2fc --- /dev/null +++ b/kdvi/TeXFont_TFM.cpp @@ -0,0 +1,163 @@ +// 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; +} |