src/frontends/xforms/xfont_loader.C

   1 /**
   2  * \file xfont_loader.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup
   7  *
   8  * Full author contact details are available in file CREDITS
   9  */
  10
  11 #include <config.h>
  12 #include <cmath>        // fabs()
  13
  14
  15 #include "xfont_loader.h"
  16 #include "FontInfo.h"
  17 #include "gettext.h"
  18 #include "debug.h"
  19 #include "lyxrc.h"      // lyxrc.font_*
  20 #include "BufferView.h"
  21 #include "frontends/LyXView.h"
  22 #include "frontends/lyx_gui.h"
  23 #include "support/systemcall.h"
  24 #include "support/filetools.h"
  25
  26 #include "lyx_forms.h"
  27
  28 using namespace lyx::support;
  29
  30 using std::endl;
  31
  32 // The global fontloader
  33 xfont_loader fontloader;
  34
  35
  36 // Initialize font loader
  37 xfont_loader::xfont_loader()
  38 {
  39         reset();
  40 }
  41
  42
  43 // Destroy font loader
  44 xfont_loader::~xfont_loader()
  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 xfont_loader::update()
  54 {
  55         unload();
  56 }
  57
  58
  59 // Reset font loader
  60 void xfont_loader::reset()
  61 {
  62         // Clear font infos, font structs and font metrics
  63         for (int i1 = 0; i1 < LyXFont::NUM_FAMILIES; ++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 xfont_loader::unload()
  76 {
  77         // Unload all fonts
  78         for (int i1 = 0; i1 < LyXFont::NUM_FAMILIES; ++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 namespace {
  95
  96 string const symbolPattern(LyXFont::FONT_FAMILY family)
  97 {
  98         switch (family) {
  99         case LyXFont::SYMBOL_FAMILY:
 100                 return "-*-symbol-*-*-*-*-*-*-*-*-*-*-adobe-fontspecific";
 101
 102         case LyXFont::CMR_FAMILY:
 103                 return "-*-cmr10-medium-*-*-*-*-*-*-*-*-*-*-*";
 104
 105         case LyXFont::CMSY_FAMILY:
 106                 return "-*-cmsy10-*-*-*-*-*-*-*-*-*-*-*-*";
 107
 108         case LyXFont::CMM_FAMILY:
 109                 return "-*-cmmi10-medium-*-*-*-*-*-*-*-*-*-*-*";
 110
 111         case LyXFont::CMEX_FAMILY:
 112                 return "-*-cmex10-*-*-*-*-*-*-*-*-*-*-*-*";
 113
 114         case LyXFont::MSA_FAMILY:
 115                 return "-*-msam10-*-*-*-*-*-*-*-*-*-*-*-*";
 116
 117         case LyXFont::MSB_FAMILY:
 118                 return "-*-msbm10-*-*-*-*-*-*-*-*-*-*-*-*";
 119
 120         case LyXFont::EUFRAK_FAMILY:
 121                 return "-*-eufm10-medium-*-*-*-*-*-*-*-*-*-*-*";
 122
 123         case LyXFont::WASY_FAMILY:
 124                 return "-*-wasy10-medium-*-*-*-*-*-*-*-*-*-*-*";
 125
 126         default:
 127                 return string();
 128         }
 129 }
 130
 131 string const fontName(string const & family, string const & foundry)
 132 {
 133         if (foundry.empty() || foundry == "Xft")
 134                 return "-*-"+family;
 135         else
 136                 return "-"+foundry+"-"+family;
 137 }
 138
 139
 140 bool addFontPath()
 141 {
 142         string const dir =  OnlyPath(LibFileSearch("xfonts", "fonts.dir"));
 143         if (!dir.empty()) {
 144                 int n;
 145                 char ** p = XGetFontPath(fl_get_display(), &n);
 146                 if (std::find(p, p + n, dir) != p + n)
 147                         return false;
 148                 lyxerr[Debug::FONT] << "Adding " << dir
 149                                     << " to the font path." << endl;
 150                 string const command = "xset fp+ " + dir;
 151                 Systemcall s;
 152                 if (!s.startscript(Systemcall::Wait, command))
 153                         return true;
 154                 lyxerr << "Unable to add " << dir << "to the font path."
 155                        << endl;
 156         }
 157         return false;
 158 }
 159
 160 } // namespace anon
 161
 162 // Get font info
 163 /* Takes care of finding which font that can match the given request. Tries
 164 different alternatives. */
 165 void xfont_loader::getFontinfo(LyXFont::FONT_FAMILY family,
 166                              LyXFont::FONT_SERIES series,
 167                              LyXFont::FONT_SHAPE shape)
 168 {
 169         // Do we have the font info already?
 170         if (fontinfo[family][series][shape] != 0)
 171                 return;
 172
 173         // Special fonts
 174         string pat = symbolPattern(family);
 175         if (!pat.empty()) {
 176                 static bool first_time = true;
 177                 fontinfo[family][series][shape] = new FontInfo(pat);
 178                 if (family != LyXFont::SYMBOL_FAMILY &&
 179                     !fontinfo[family][series][shape]->exist() &&
 180                     first_time) {
 181                         first_time = false;
 182                         if (addFontPath()) {
 183                                 delete fontinfo[family][series][shape];
 184                                 fontinfo[family][series][shape] = new FontInfo(pat);
 185                         }
 186                 }
 187                 return;
 188         }
 189
 190
 191         // Normal font. Let's search for an existing name that matches.
 192         string ffamily;
 193         string fseries;
 194         string fshape;
 195         string norm = lyxrc.font_norm;
 196         string fontname;
 197
 198         FontInfo * fi = new FontInfo;
 199         fontinfo[family][series][shape] = fi;
 200
 201         for (int cfam = 0; cfam < 2; ++cfam) {
 202                 // Determine family name
 203                 switch (family) {
 204                 case LyXFont::ROMAN_FAMILY:
 205                         switch (cfam) {
 206                         case 0: ffamily = fontName(lyxrc.roman_font_name,
 207                                                    lyxrc.roman_font_foundry);
 208                                 break;
 209                         case 1: ffamily = "-*-times";
 210                         default: cfam = 100;
 211                         }
 212                         break;
 213                 case LyXFont::SANS_FAMILY:
 214                         switch (cfam) {
 215                         case 0: ffamily = fontName(lyxrc.sans_font_name,
 216                                                    lyxrc.sans_font_foundry);
 217                                 break;
 218                         case 1: ffamily = "-*-helvetica";
 219                         default: cfam = 100;
 220                         }
 221                         break;
 222                 case LyXFont::TYPEWRITER_FAMILY:
 223                         switch (cfam) {
 224                         case 0: ffamily = fontName(lyxrc.typewriter_font_name,
 225                                                    lyxrc.typewriter_font_foundry);
 226                                 break;
 227                         case 1: ffamily = "-*-courier";
 228                         default: cfam = 100;
 229                         }
 230                         break;
 231                 default: ;
 232                 }
 233
 234                 for (int cser = 0; cser < 4; ++cser) {
 235                         // Determine series name
 236                         switch (series) {
 237                         case LyXFont::MEDIUM_SERIES:
 238                                 switch (cser) {
 239                                 case 0: fseries = "-medium"; break;
 240                                 case 1: fseries = "-book"; break;
 241                                 case 2: fseries = "-light";
 242                                 default: cser = 100;
 243                                 }
 244                                 break;
 245                         case LyXFont::BOLD_SERIES:
 246                                 switch (cser) {
 247                                 case 0: fseries = "-bold"; break;
 248                                 case 1: fseries = "-black"; break;
 249                                 case 2: fseries = "-demi"; break;
 250                                 case 3: fseries = "-demibold";
 251                                 default: cser = 100;
 252                                 }
 253                                 break;
 254                         default: ;
 255                         }
 256
 257                         for (int csha = 0; csha < 2; ++csha) {
 258                                 // Determine shape name
 259                                 switch (shape) {
 260                                 case LyXFont::UP_SHAPE:
 261                                 case LyXFont::SMALLCAPS_SHAPE:
 262                                         switch (csha) {
 263                                         case 0: fshape = "-r";
 264                                         default: csha = 100;
 265                                         }
 266                                         break;
 267                                 case LyXFont::ITALIC_SHAPE:
 268                                         switch (csha) {
 269                                         case 0: fshape = "-i"; break;
 270                                         case 1: fshape = "-o";
 271                                         default: csha = 100;
 272                                         }
 273                                         break;
 274                                 case LyXFont::SLANTED_SHAPE:
 275                                         switch (csha) {
 276                                         case 0: fshape = "-o"; break;
 277                                         case 1: fshape = "-i";
 278                                         default: csha = 100;
 279                                         }
 280                                         break;
 281                                 default: ;
 282                                 }
 283                                 //
 284                                 fontname = ffamily + fseries + fshape +
 285                                            "-normal-*-*-*-*-*-*-*-" + norm;
 286                                 fi->setPattern(fontname);
 287                                 if (fi->exist()) {
 288                                         return;
 289                                 }
 290                         }
 291                 }
 292         }
 293 }
 294
 295
 296 // A dummy fontstruct used when there is no gui.
 297 namespace {
 298
 299 XFontStruct dummyXFontStruct;
 300 bool dummyXFontStructisGood = false;
 301
 302 } // namespace anon
 303
 304 /// Do load font
 305 XFontStruct * xfont_loader::doLoad(LyXFont::FONT_FAMILY family,
 306                                 LyXFont::FONT_SERIES series,
 307                                 LyXFont::FONT_SHAPE shape,
 308                                 LyXFont::FONT_SIZE size)
 309 {
 310         if (!lyx_gui::use_gui) {
 311                 if (!dummyXFontStructisGood) {
 312                         // no character specific info
 313                         dummyXFontStruct.per_char = 0;
 314                         // unit ascent on character displays
 315                         dummyXFontStruct.ascent = 1;
 316                         // no descent on character displays
 317                         dummyXFontStruct.descent = 0;
 318                         dummyXFontStructisGood = true;
 319                 }
 320
 321                 return &dummyXFontStruct;
 322         }
 323
 324         getFontinfo(family, series, shape);
 325         // FIXME! CHECK! Should we use 72.0 or 72.27? (Lgb)
 326         int fsize = int((lyxrc.font_sizes[size] * lyxrc.dpi *
 327                           (lyxrc.zoom/100.0)) / 72.27 + 0.5);
 328
 329         string font = fontinfo[family][series][shape]->getFontname(fsize);
 330
 331         if (font.empty()) {
 332                 lyxerr << "No font matches request. Using 'fixed'." << endl;
 333                 lyxerr << "Start LyX as 'lyx -dbg 515' to get more information." << endl;
 334                 font = "fixed";
 335         }
 336
 337         XFontStruct * fs = 0;
 338
 339         fs = XLoadQueryFont(fl_get_display(), font.c_str());
 340
 341         if (fs == 0) {
 342                 if (font == "fixed") {
 343                         lyxerr << "We're doomed. Can't get 'fixed' font." << endl;
 344                 } else {
 345                         lyxerr << "Could not get font '" << font
 346                                 << "'. Using 'fixed'." << endl;
 347                         fs = XLoadQueryFont(fl_get_display(), "fixed");
 348                 }
 349         } else if (lyxerr.debugging(Debug::FONT)) {
 350                 // Tell user the font matching
 351                 LyXFont f;
 352                 f.setFamily(family);
 353                 f.setSeries(series);
 354                 f.setShape(shape);
 355                 f.setSize(size);
 356                 // The rest of the attributes are not interesting
 357                 f.setEmph(LyXFont::INHERIT);
 358                 f.setUnderbar(LyXFont::INHERIT);
 359                 f.setNoun(LyXFont::INHERIT);
 360                 f.setColor(LColor::inherit);
 361                 lyxerr << "Font '" << f.stateText(0)
 362                        << "' matched by\n" << font << endl;
 363         }
 364
 365         fontstruct[family][series][shape][size] = fs;
 366         return fs;
 367 }
 368
 369
 370 bool xfont_loader::available(LyXFont const & f)
 371 {
 372         if (!lyx_gui::use_gui)
 373                 return false;
 374
 375         if (!fontinfo[f.family()][f.series()][f.realShape()])
 376                 getFontinfo(f.family(), f.series(), f.realShape());
 377         return fontinfo[f.family()][f.series()][f.realShape()]->exist();
 378 }