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