src/FontLoader.C

   1 // -*- C++ -*-
   2 /* This file is part of
   3  * ======================================================
   4  *
   5  *           LyX, The Document Processor
   6  *
   7  *          Copyright 1997 Asger Alstrup
   8  *           and the LyX Team.
   9  *
  10  * ====================================================== */
  11
  12 #include <config.h>
  13 #include <cmath>        // fabs()
  14
  15 #ifdef __GNUG__
  16 #pragma implementation "FontLoader.h"
  17 #endif
  18
  19 #include "gettext.h"
  20 #include "FontLoader.h"
  21 #include "FontInfo.h"
  22 #include "debug.h"
  23 #include "lyxrc.h"      // lyxrc.font_*
  24 #include "BufferView.h"
  25 #include "LyXView.h"
  26
  27 using std::endl;
  28
  29 extern BufferView * current_view;
  30
  31
  32 // The global fontloader
  33 FontLoader fontloader;
  34
  35
  36 // Initialize font loader
  37 FontLoader::FontLoader()
  38 {
  39         reset();
  40 }
  41
  42
  43 // Destroy font loader
  44 FontLoader::~FontLoader()
  45 {
  46         unload();
  47 }
  48
  49
  50 // Update fonts after zoom, dpi, font names, or norm change
  51 // For now, we just ditch all fonts we have. Later, we should
  52 // reuse the ones that are already loaded.
  53 void FontLoader::update()
  54 {
  55         unload();
  56 }
  57
  58
  59 // Reset font loader
  60 void FontLoader::reset()
  61 {
  62         // Clear font infos, font structs and font metrics
  63         for (int i1 = 0; i1 < 4; ++i1)
  64                 for (int i2 = 0; i2 < 2; ++i2)
  65                         for (int i3 = 0; i3 < 4; ++i3) {
  66                                 fontinfo[i1][i2][i3] = 0;
  67                                 for (int i4 = 0; i4<10; ++i4) {
  68                                         fontstruct[i1][i2][i3][i4] = 0;
  69                                 }
  70                         }
  71 }
  72
  73
  74 // Unload all fonts
  75 void FontLoader::unload()
  76 {
  77         // Unload all fonts
  78         for (int i1 = 0; i1 < 4; ++i1)
  79                 for (int i2 = 0; i2 < 2; ++i2)
  80                         for (int i3 = 0; i3 < 4; ++i3) {
  81                                 if (fontinfo[i1][i2][i3]) {
  82                                         delete fontinfo[i1][i2][i3];
  83                                         fontinfo[i1][i2][i3] = 0;
  84                                 }
  85                                 for (int i4 = 0; i4 < 10; ++i4) {
  86                                         if (fontstruct[i1][i2][i3][i4]) {
  87                                                 XFreeFont(fl_get_display(), fontstruct[i1][i2][i3][i4]);
  88                                                 fontstruct[i1][i2][i3][i4] = 0;
  89                                         }
  90                                 }
  91                         }
  92 }
  93
  94
  95 // Get font info
  96 /* Takes care of finding which font that can match the given request. Tries
  97 different alternatives. */
  98 void FontLoader::getFontinfo(LyXFont::FONT_FAMILY family,
  99                              LyXFont::FONT_SERIES series,
 100                              LyXFont::FONT_SHAPE shape)
 101 {
 102         // Do we have the font info already?
 103         if (fontinfo[family][series][shape] != 0)
 104                 return;
 105
 106         // Special code for the symbol family
 107         if (family == LyXFont::SYMBOL_FAMILY){
 108                 fontinfo[family][series][shape] = new FontInfo("-*-symbol-*");
 109                 return;
 110         }
 111
 112         // Normal font. Let's search for an existing name that matches.
 113         string ffamily;
 114         string fseries;
 115         string fshape;
 116         string norm = lyxrc.font_norm;
 117         string fontname;
 118
 119         FontInfo * fi = new FontInfo();
 120         fontinfo[family][series][shape] = fi;
 121
 122         for (int cfam = 0; cfam < 2; ++cfam) {
 123                 // Determine family name
 124                 switch (family) {
 125                 case LyXFont::ROMAN_FAMILY:
 126                         switch (cfam) {
 127                         case 0: ffamily = lyxrc.roman_font_name; break;
 128                         case 1: ffamily = "-*-times";
 129                         default: cfam = 100;
 130                         }
 131                         break;
 132                 case LyXFont::SANS_FAMILY:
 133                         switch (cfam) {
 134                         case 0: ffamily = lyxrc.sans_font_name; break;
 135                         case 1: ffamily = "-*-helvetica";
 136                         default: cfam = 100;
 137                         }
 138                         break;
 139                 case LyXFont::TYPEWRITER_FAMILY:
 140                         switch (cfam) {
 141                         case 0: ffamily = lyxrc.typewriter_font_name; break;
 142                         case 1: ffamily = "-*-courier";
 143                         default: cfam = 100;
 144                         }
 145                         break;
 146                 default: ;
 147                 }
 148
 149                 for (int cser = 0; cser < 4; ++cser) {
 150                         // Determine series name
 151                         switch (series) {
 152                         case LyXFont::MEDIUM_SERIES:
 153                                 switch (cser) {
 154                                 case 0: fseries = "-medium"; break;
 155                                 case 1: fseries = "-book"; break;
 156                                 case 2: fseries = "-light";
 157                                 default: cser = 100;
 158                                 }
 159                                 break;
 160                         case LyXFont::BOLD_SERIES:
 161                                 switch (cser) {
 162                                 case 0: fseries = "-bold"; break;
 163                                 case 1: fseries = "-black"; break;
 164                                 case 2: fseries = "-demi"; break;
 165                                 case 3: fseries = "-demibold";
 166                                 default: cser = 100;
 167                                 }
 168                                 break;
 169                         default: ;
 170                         }
 171
 172                         for (int csha = 0; csha < 2; ++csha) {
 173                                 // Determine shape name
 174                                 switch (shape) {
 175                                 case LyXFont::UP_SHAPE:
 176                                 case LyXFont::SMALLCAPS_SHAPE:
 177                                         switch (csha) {
 178                                         case 0: fshape = "-r";
 179                                         default: csha = 100;
 180                                         }
 181                                         break;
 182                                 case LyXFont::ITALIC_SHAPE:
 183                                         switch (csha) {
 184                                         case 0: fshape = "-i"; break;
 185                                         case 1: fshape = "-o";
 186                                         default: csha = 100;
 187                                         }
 188                                         break;
 189                                 case LyXFont::SLANTED_SHAPE:
 190                                         switch (csha) {
 191                                         case 0: fshape = "-o"; break;
 192                                         case 1: fshape = "-i";
 193                                         default: csha = 100;
 194                                         }
 195                                         break;
 196                                 default: ;
 197                                 }
 198                                 //
 199                                 fontname = ffamily + fseries + fshape +
 200                                            "-normal-*-*-*-*-*-*-*-" + norm;
 201                                 fi->setPattern(fontname);
 202                                 if (fi->exist()) {
 203                                         return;
 204                                 }
 205                         }
 206                 }
 207         }
 208 }
 209
 210
 211 // A dummy fontstruct used when there is no gui.
 212 namespace {
 213
 214 XFontStruct dummyXFontStruct;
 215 bool dummyXFontStructisGood = false;
 216
 217 } // namespace anon
 218
 219 /// Do load font
 220 XFontStruct * FontLoader::doLoad(LyXFont::FONT_FAMILY family,
 221                                 LyXFont::FONT_SERIES series,
 222                                 LyXFont::FONT_SHAPE shape,
 223                                 LyXFont::FONT_SIZE size)
 224 {
 225         if (!lyxrc.use_gui) {
 226                 if (!dummyXFontStructisGood) {
 227                         // no character specific info
 228                         dummyXFontStruct.per_char = 0;
 229                         // unit ascent on character displays
 230                         dummyXFontStruct.ascent = 1;
 231                         // no descent on character displays
 232                         dummyXFontStruct.descent = 0;
 233                         dummyXFontStructisGood = true;
 234                 }
 235
 236                 return &dummyXFontStruct;
 237         }
 238
 239         getFontinfo(family, series, shape);
 240         int fsize = int( (lyxrc.font_sizes[size] * lyxrc.dpi *
 241                           (lyxrc.zoom/100.0) ) / 72.27 + 0.5 );
 242
 243         string font = fontinfo[family][series][shape]->getFontname(fsize);
 244
 245         if (font.empty()) {
 246                 lyxerr << "No font matches request. Using 'fixed'." << endl;
 247                 lyxerr << "Start LyX as 'lyx -dbg 515' to get more information." << endl;
 248                 font = "fixed";
 249         }
 250
 251         XFontStruct * fs = 0;
 252
 253         current_view->owner()->messagePush(_("Loading font into X-Server..."));
 254
 255         fs = XLoadQueryFont(fl_get_display(), font.c_str());
 256
 257         if (fs == 0) {
 258                 if (font == "fixed") {
 259                         lyxerr << "We're doomed. Can't get 'fixed' font." << endl;
 260                 } else {
 261                         lyxerr << "Could not get font. Using 'fixed'." << endl;
 262                         fs = XLoadQueryFont(fl_get_display(), "fixed");
 263                 }
 264         } else if (lyxerr.debugging(Debug::FONT)) {
 265                 // Tell user the font matching
 266                 LyXFont f;
 267                 f.setFamily(family);
 268                 f.setSeries(series);
 269                 f.setShape(shape);
 270                 f.setSize(size);
 271                 // The rest of the attributes are not interesting
 272                 f.setEmph(LyXFont::INHERIT);
 273                 f.setUnderbar(LyXFont::INHERIT);
 274                 f.setNoun(LyXFont::INHERIT);
 275                 f.setLatex(LyXFont::INHERIT);
 276                 f.setColor(LColor::inherit);
 277                 lyxerr << "Font '" << f.stateText(0)
 278                        << "' matched by\n" << font << endl;
 279         }
 280
 281         current_view->owner()->messagePop();
 282
 283         fontstruct[family][series][shape][size] = fs;
 284         return fs;
 285 }