src/frontends/qt4/GuiFontLoader.cpp

   1 /**
   2  * \file GuiFontLoader.cpp
   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  * \author John Levon
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "GuiFontLoader.h"
  15 #include "qt_helpers.h"
  16
  17 #include "support/debug.h"
  18 #include "LyXRC.h"
  19
  20 #include "support/convert.h"
  21 #include "support/filetools.h"
  22 #include "support/lstrings.h"
  23 #include "support/Systemcall.h"
  24 #include "support/Package.h"
  25 #include "support/os.h"
  26
  27 #include <QFontInfo>
  28 #include <QFontDatabase>
  29
  30
  31 QString const math_fonts[] = {"cmex10", "cmmi10", "cmr10", "cmsy10",
  32         "eufm10", "msam10", "msbm10", "wasy10", "esint10"};
  33 int const num_math_fonts = sizeof(math_fonts) / sizeof(*math_fonts);
  34
  35
  36 namespace lyx {
  37
  38 using support::contains;
  39 using support::package;
  40 using support::addPath;
  41 using support::addName;
  42
  43 extern docstring const stateText(FontInfo const & f);
  44
  45 namespace frontend {
  46
  47 namespace {
  48
  49 struct SymbolFont {
  50         FontFamily lyx_family;
  51         QString family;
  52         QString xlfd;
  53 };
  54
  55 SymbolFont symbol_fonts[] = {
  56         { SYMBOL_FAMILY,
  57                 "symbol",
  58                 "-*-symbol-*-*-*-*-*-*-*-*-*-*-adobe-fontspecific" },
  59
  60         { CMR_FAMILY,
  61                 "cmr10",
  62                 "-*-cmr10-medium-*-*-*-*-*-*-*-*-*-*-*" },
  63
  64         { CMSY_FAMILY,
  65                 "cmsy10",
  66                 "-*-cmsy10-*-*-*-*-*-*-*-*-*-*-*-*" },
  67
  68         { CMM_FAMILY,
  69                 "cmmi10",
  70                 "-*-cmmi10-medium-*-*-*-*-*-*-*-*-*-*-*" },
  71
  72         { CMEX_FAMILY,
  73                 "cmex10",
  74                 "-*-cmex10-*-*-*-*-*-*-*-*-*-*-*-*" },
  75
  76         { MSA_FAMILY,
  77                 "msam10",
  78                 "-*-msam10-*-*-*-*-*-*-*-*-*-*-*-*" },
  79
  80         { MSB_FAMILY,
  81                 "msbm10",
  82                 "-*-msbm10-*-*-*-*-*-*-*-*-*-*-*-*" },
  83
  84         { EUFRAK_FAMILY,
  85                 "eufm10",
  86                 "-*-eufm10-medium-*-*-*-*-*-*-*-*-*-*-*" },
  87
  88         { WASY_FAMILY,
  89                 "wasy10",
  90                 "-*-wasy10-medium-*-*-*-*-*-*-*-*-*-*-*" },
  91
  92         { ESINT_FAMILY,
  93                 "esint10",
  94                 "-*-esint10-medium-*-*-*-*-*-*-*-*-*-*-*" }
  95 };
  96
  97 size_t const nr_symbol_fonts = sizeof(symbol_fonts) / sizeof(SymbolFont);
  98
  99
 100 QString getRawName(QString const & family)
 101 {
 102         for (size_t i = 0; i < nr_symbol_fonts; ++i)
 103                 if (family == symbol_fonts[i].family)
 104                         return symbol_fonts[i].xlfd;
 105
 106         LYXERR(Debug::FONT, "BUG: family not found !");
 107         return QString();
 108 }
 109
 110
 111 QString const symbolFamily(FontFamily family)
 112 {
 113         for (size_t i = 0; i < nr_symbol_fonts; ++i) {
 114                 if (family == symbol_fonts[i].lyx_family)
 115                         return symbol_fonts[i].family;
 116         }
 117         return QString();
 118 }
 119
 120
 121 bool isSymbolFamily(FontFamily family)
 122 {
 123         return family >= SYMBOL_FAMILY && family <= ESINT_FAMILY;
 124 }
 125
 126
 127 static bool isChosenFont(QFont & font, QString const & family)
 128 {
 129         // QFontInfo won't find a font that has only a few glyphs at unusual
 130         // positions, e.g. the original esint10 font.
 131         // The workaround is to add dummy glyphs at least at all ASCII
 132         // positions.
 133         QFontInfo fi(font);
 134
 135         LYXERR(Debug::FONT, "got: " << fromqstr(fi.family()));
 136
 137         if (fi.family().contains(family)) {
 138                 LYXERR(Debug::FONT, " got it ");
 139                 return true;
 140         }
 141
 142         return false;
 143 }
 144
 145
 146 QFont symbolFont(QString const & family, bool * ok)
 147 {
 148         LYXERR(Debug::FONT, "Looking for font family "
 149                 << fromqstr(family) << " ... ");
 150         QString upper = family;
 151         upper[0] = family[0].toUpper();
 152
 153         QFont font;
 154         font.setKerning(false);
 155         font.setFamily(family);
 156
 157         if (isChosenFont(font, family)) {
 158                 LYXERR(Debug::FONT, "normal!");
 159                 *ok = true;
 160                 return font;
 161         }
 162
 163         LYXERR(Debug::FONT, "Trying " << fromqstr(upper) << " ... ");
 164         font.setFamily(upper);
 165
 166         if (isChosenFont(font, upper)) {
 167                 LYXERR(Debug::FONT, "upper!");
 168                 *ok = true;
 169                 return font;
 170         }
 171
 172         // A simple setFamily() fails on Qt 2
 173
 174         QString const rawName = getRawName(family);
 175         LYXERR(Debug::FONT, "Trying " << fromqstr(rawName) << " ... ");
 176         font.setRawName(rawName);
 177
 178         if (isChosenFont(font, family)) {
 179                 LYXERR(Debug::FONT, "raw version!");
 180                 *ok = true;
 181                 return font;
 182         }
 183
 184         LYXERR(Debug::FONT, " FAILED :-(");
 185         *ok = false;
 186         return font;
 187 }
 188
 189 } // namespace anon
 190
 191
 192 GuiFontLoader::GuiFontLoader()
 193 {
 194         QString const fonts_dir =
 195                 toqstr(addPath(package().system_support().absFilename(), "fonts"));
 196
 197         for (int i = 0 ; i < num_math_fonts; ++i) {
 198                 QString const font_file = fonts_dir + '/' + math_fonts[i] + ".ttf";
 199                 int fontID = QFontDatabase::addApplicationFont(font_file);
 200
 201                 LYXERR(Debug::FONT, "Adding font " << fromqstr(font_file)
 202                                     << static_cast<const char *>
 203                                         (fontID < 0 ? " FAIL" : " OK"));
 204         }
 205
 206         for (int i1 = 0; i1 < NUM_FAMILIES; ++i1)
 207                 for (int i2 = 0; i2 < 2; ++i2)
 208                         for (int i3 = 0; i3 < 4; ++i3)
 209                                 for (int i4 = 0; i4 < 10; ++i4)
 210                                         fontinfo_[i1][i2][i3][i4] = 0;
 211 }
 212
 213
 214 void GuiFontLoader::update()
 215 {
 216         for (int i1 = 0; i1 < NUM_FAMILIES; ++i1) {
 217                 for (int i2 = 0; i2 < 2; ++i2)
 218                         for (int i3 = 0; i3 < 4; ++i3)
 219                                 for (int i4 = 0; i4 < 10; ++i4) {
 220                                         delete fontinfo_[i1][i2][i3][i4];
 221                                         fontinfo_[i1][i2][i3][i4] = 0;
 222                                 }
 223         }
 224 }
 225
 226
 227 GuiFontLoader::~GuiFontLoader()
 228 {
 229         update();
 230 }
 231
 232 /////////////////////////////////////////////////
 233
 234
 235 static QString makeFontName(QString const & family, QString const & foundry)
 236 {
 237         QString res = family;
 238         if (!foundry.isEmpty())
 239                 res += " [" + foundry + ']';
 240         return res;
 241 }
 242
 243
 244 GuiFontInfo::GuiFontInfo(FontInfo const & f)
 245         : metrics(QFont())
 246 {
 247         font.setKerning(false);
 248         QString const pat = symbolFamily(f.family());
 249         if (!pat.isEmpty()) {
 250                 bool ok;
 251                 font = symbolFont(pat, &ok);
 252         } else {
 253                 switch (f.family()) {
 254                 case ROMAN_FAMILY: {
 255                         QString family = makeFontName(toqstr(lyxrc.roman_font_name),
 256                                                                                                                                                 toqstr(lyxrc.roman_font_foundry));
 257                         font.setFamily(family);
 258 #ifdef Q_WS_MACX
 259 #if QT_VERSION >= 0x040300
 260                         // Workaround for a Qt bug, see http://bugzilla.lyx.org/show_bug.cgi?id=3684
 261                         // It is reported to Trolltech at 02/06/07 against 4.3 final.
 262                         // FIXME: Add an upper version limit as soon as the bug is fixed in Qt.
 263                         if (family == "Times" && !font.exactMatch())
 264                                 font.setFamily("Times New Roman");
 265 #endif
 266 #endif
 267                         break;
 268                 }
 269                 case SANS_FAMILY:
 270                         font.setFamily(makeFontName(toqstr(lyxrc.sans_font_name),
 271                                                     toqstr(lyxrc.sans_font_foundry)));
 272                         break;
 273                 case TYPEWRITER_FAMILY:
 274                         font.setFamily(makeFontName(toqstr(lyxrc.typewriter_font_name),
 275                                                     toqstr(lyxrc.typewriter_font_foundry)));
 276                         break;
 277                 default:
 278                         break;
 279                 }
 280         }
 281
 282         switch (f.series()) {
 283                 case MEDIUM_SERIES:
 284                         font.setWeight(QFont::Normal);
 285                         break;
 286                 case BOLD_SERIES:
 287                         font.setWeight(QFont::Bold);
 288                         break;
 289                 default:
 290                         break;
 291         }
 292
 293         switch (f.realShape()) {
 294                 case ITALIC_SHAPE:
 295                 case SLANTED_SHAPE:
 296                         font.setItalic(true);
 297                         break;
 298                 default:
 299                         break;
 300         }
 301
 302         LYXERR(Debug::FONT, "Font '" << to_utf8(stateText(f))
 303                 << "' matched by\n" << fromqstr(font.family()));
 304
 305         // Is this an exact match?
 306         if (font.exactMatch())
 307                 LYXERR(Debug::FONT, "This font is an exact match");
 308         else
 309                 LYXERR(Debug::FONT, "This font is NOT an exact match");
 310
 311         LYXERR(Debug::FONT, "XFLD: " << fromqstr(font.rawName()));
 312
 313         font.setPointSizeF(convert<double>(lyxrc.font_sizes[f.size()])
 314                                * lyxrc.zoom / 100.0);
 315
 316         LYXERR(Debug::FONT, "The font has size: " << font.pointSizeF());
 317
 318         if (f.realShape() != SMALLCAPS_SHAPE) {
 319                 metrics = GuiFontMetrics(font);
 320         } else {
 321                 // handle small caps ourselves ...
 322                 FontInfo smallfont = f;
 323                 smallfont.decSize().decSize().setShape(UP_SHAPE);
 324                 QFont font2(font);
 325                 font2.setKerning(false);
 326                 font2.setPointSizeF(convert<double>(lyxrc.font_sizes[smallfont.size()])
 327                                * lyxrc.zoom / 100.0);
 328
 329                 metrics = GuiFontMetrics(font, font2);
 330         }
 331 }
 332
 333
 334 bool GuiFontLoader::available(FontInfo const & f)
 335 {
 336         static std::vector<int> cache_set(NUM_FAMILIES, false);
 337         static std::vector<int> cache(NUM_FAMILIES, false);
 338
 339         FontFamily family = f.family();
 340         if (cache_set[family])
 341                 return cache[family];
 342         cache_set[family] = true;
 343
 344         QString const pat = symbolFamily(family);
 345         if (pat.isEmpty())
 346                 // We don't care about non-symbol fonts
 347                 return false;
 348
 349         bool ok;
 350         symbolFont(pat, &ok);
 351         if (!ok)
 352                 return false;
 353
 354         cache[family] = true;
 355         return true;
 356 }
 357
 358 } // namespace frontend
 359 } // namespace lyx