// 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 <tdelocale.h> #include <tqdatastream.h> #include <tqfile.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 TQFile file( parent->filename ); if ( !file.open( IO_ReadOnly ) ) { kdError(4300) << "TeXFont_TFM::TeXFont_TFM(): Could not read TFM file" << endl; return; } TQDataStream stream( &file ); // Data from the very beginning of the TFM file, as specified in // "The DVI Driver Standard, Level 0", section D.2.1 TQ_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; TQ_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(TQ_UINT16 characterCode, bool generateCharacterPixmap, const TQColor& 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; TQ_UINT16 pixelWidth = (TQ_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); TQ_UINT16 pixelHeight = (TQ_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; }