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