src/frontends/gtk/xftFontLoader.C

   1 /**
   2  * \file xftFontLoader.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Huang Ying
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 // Too hard to make concept checks work with this file
  14 #ifdef _GLIBCXX_CONCEPT_CHECKS
  15 #undef _GLIBCXX_CONCEPT_CHECKS
  16 #endif
  17 #ifdef _GLIBCPP_CONCEPT_CHECKS
  18 #undef _GLIBCPP_CONCEPT_CHECKS
  19 #endif
  20
  21 #include "xftFontLoader.h"
  22 #include "gettext.h"
  23 #include "debug.h"
  24 #include "lyxrc.h"      // lyxrc.font_*
  25 #include "BufferView.h"
  26 #include "GtkmmX.h"
  27
  28 #include "frontends/LyXView.h"
  29 #include "frontends/lyx_gui.h"
  30
  31 #include "support/convert.h"
  32 #include "support/lstrings.h"
  33 #include "support/systemcall.h"
  34 #include "support/filetools.h"
  35
  36 #include <cmath>        // fabs()
  37 #include <vector>
  38
  39 using std::endl;
  40 using std::string;
  41
  42 // The global fontLoader
  43 xftFontLoader fontLoader;
  44
  45
  46 // Initialize font loader
  47 xftFontLoader::xftFontLoader()
  48 {
  49 }
  50
  51
  52 // Destroy font loader
  53 xftFontLoader::~xftFontLoader()
  54 {
  55         unload();
  56 }
  57
  58
  59 // Update fonts after zoom, dpi, font names, or norm change
  60 // For now, we just ditch all fonts we have. Later, we should
  61 // reuse the ones that are already loaded.
  62 void xftFontLoader::update()
  63 {
  64         unload();
  65 }
  66
  67
  68 // Unload all fonts
  69 void xftFontLoader::unload()
  70 {
  71         // Unload all fonts
  72         for (int i1 = 0; i1 < LyXFont::NUM_FAMILIES; ++i1)
  73                 for (int i2 = 0; i2 < 2; ++i2)
  74                         for (int i3 = 0; i3 < 4; ++i3)
  75                                 for (int i4 = 0; i4 < 10; ++i4) {
  76                                         if (fonts_[i1][i2][i3][i4]){
  77                                                 XftFontClose(getDisplay(), fonts_[i1][i2][i3][i4]);
  78                                                 fonts_[i1][i2][i3][i4] = 0;
  79                                         }
  80                                 }
  81 }
  82
  83
  84 string xftFontLoader::familyString(LyXFont::FONT_FAMILY family)
  85 {
  86         string ffamily;
  87         switch (family) {
  88         case LyXFont::ROMAN_FAMILY:
  89                 ffamily = lyxrc.roman_font_name;
  90                 break;
  91         case LyXFont::SANS_FAMILY:
  92                 ffamily = lyxrc.sans_font_name;
  93                 break;
  94         case LyXFont::TYPEWRITER_FAMILY:
  95                 ffamily = lyxrc.typewriter_font_name;
  96                 break;
  97         case LyXFont::CMR_FAMILY:
  98                 ffamily = "cmr10";
  99                 break;
 100         case LyXFont::CMSY_FAMILY:
 101                 ffamily = "cmsy10";
 102                 break;
 103         case LyXFont::CMM_FAMILY:
 104                 ffamily = "cmmi10";
 105                 break;
 106         case LyXFont::CMEX_FAMILY:
 107                 ffamily = "cmex10";
 108                 break;
 109         case LyXFont::MSA_FAMILY:
 110                 ffamily = "msam10";
 111                 break;
 112         case LyXFont::MSB_FAMILY:
 113                 ffamily = "msbm10";
 114                 break;
 115         default:
 116                 ffamily = "Sans";
 117                 break;
 118         }
 119         return ffamily;
 120 }
 121
 122
 123 // Get font pattern
 124 /* Takes care of finding which font that can match the given request. Tries
 125 different alternatives. */
 126 XftPattern * xftFontLoader::getFontPattern(LyXFont::FONT_FAMILY family,
 127                                           LyXFont::FONT_SERIES series,
 128                                           LyXFont::FONT_SHAPE shape,
 129                                           LyXFont::FONT_SIZE size)
 130 {
 131         // Normal font. Let's search for an existing name that matches.
 132         string ffamily;
 133         int fweight;
 134         int fslant;
 135         double fsize = convert<double>(lyxrc.font_sizes[size]) * lyxrc.zoom / 100.0;
 136         XftPattern *fpat = XftPatternCreate();
 137
 138         ffamily = familyString(family);
 139         switch (series) {
 140         case LyXFont::MEDIUM_SERIES:
 141                 fweight = XFT_WEIGHT_MEDIUM;
 142                 break;
 143         case LyXFont::BOLD_SERIES:
 144                 fweight = XFT_WEIGHT_BOLD;
 145                 break;
 146         default:
 147                 fweight = XFT_WEIGHT_MEDIUM;
 148                 break;
 149         }
 150
 151         switch (shape) {
 152         case LyXFont::UP_SHAPE:
 153         case LyXFont::SMALLCAPS_SHAPE:
 154                 fslant = XFT_SLANT_ROMAN;
 155                 break;
 156         case LyXFont::ITALIC_SHAPE:
 157                 fslant = XFT_SLANT_ITALIC;
 158                 break;
 159         case LyXFont::SLANTED_SHAPE:
 160                 fslant = XFT_SLANT_OBLIQUE;
 161                 break;
 162         default:
 163                 fslant = XFT_SLANT_ROMAN;
 164                 break;
 165         }
 166         XftPatternAddString(fpat, XFT_FAMILY, ffamily.c_str());
 167         XftPatternAddInteger(fpat, XFT_WEIGHT, fweight);
 168         XftPatternAddInteger(fpat, XFT_SLANT, fslant);
 169         XftPatternAddDouble(fpat, XFT_SIZE, fsize);
 170         return fpat;
 171 }
 172
 173
 174 /// Do load font
 175 XftFont * xftFontLoader::doLoad(LyXFont::FONT_FAMILY family,
 176                                LyXFont::FONT_SERIES series,
 177                                LyXFont::FONT_SHAPE shape,
 178                                LyXFont::FONT_SIZE size)
 179 {
 180         XftPattern * fpat = getFontPattern(family, series, shape, size);
 181         XftResult result;
 182         XftPattern * fpat2 = XftFontMatch(getDisplay(), getScreen(),
 183                                           fpat, &result);
 184         XftFont * font = XftFontOpenPattern(getDisplay(), fpat2);
 185         fonts_[family][series][shape][size] = font;
 186         return font;
 187 }
 188
 189
 190 bool xftFontLoader::available(LyXFont const & f)
 191 {
 192         if (!lyx_gui::use_gui)
 193                 return false;
 194
 195         static std::vector<bool> cache_set(LyXFont::NUM_FAMILIES, false);
 196         static std::vector<bool> cache(LyXFont::NUM_FAMILIES, false);
 197
 198         LyXFont::FONT_FAMILY family = f.family();
 199         if (cache_set[family])
 200                 return cache[family];
 201         cache_set[family] = true;
 202
 203         string const ffamily = familyString(family);
 204         if (isSpecial(f)) {
 205                 cache_set[family] = true;
 206                 XftPattern * fpat = XftPatternCreate();
 207                 XftPatternAddString(fpat, XFT_FAMILY, ffamily.c_str());
 208                 XftResult result;
 209                 XftPattern * fpat2 = XftFontMatch(getDisplay(), getScreen(),
 210                                                   fpat, &result);
 211                 XftPatternDestroy(fpat);
 212                 char * familyM;
 213                 XftPatternGetString(fpat2, XFT_FAMILY, 0, &familyM);
 214                 if (ffamily == familyM) {
 215                         cache[family] = true;
 216                         return true;
 217                 }
 218                 // We don't need to set cache[family] to false, as it
 219                 // is initialized to false;
 220                 return false;
 221         }
 222         // We don't care about non-symbol fonts
 223         return false;
 224 }