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 #include "xftFontLoader.h"
  14 #include "FontInfo.h"
  15 #include "gettext.h"
  16 #include "debug.h"
  17 #include "lyxrc.h"      // lyxrc.font_*
  18 #include "BufferView.h"
  19 #include "GtkmmX.h"
  20
  21 #include "frontends/LyXView.h"
  22 #include "frontends/lyx_gui.h"
  23
  24 #include "support/systemcall.h"
  25 #include "support/filetools.h"
  26
  27 #include <gtkmm.h>
  28
  29 #include <X11/Xft/Xft.h>
  30
  31 #include <cmath>        // fabs()
  32 #include <vector>
  33
  34
  35 using std::endl;
  36 using std::string;
  37
  38 // The global fontLoader
  39 xftFontLoader fontLoader;
  40
  41
  42 // Initialize font loader
  43 xftFontLoader::xftFontLoader()
  44 {
  45 }
  46
  47
  48 // Destroy font loader
  49 xftFontLoader::~xftFontLoader()
  50 {
  51         unload();
  52 }
  53
  54
  55 // Update fonts after zoom, dpi, font names, or norm change
  56 // For now, we just ditch all fonts we have. Later, we should
  57 // reuse the ones that are already loaded.
  58 void xftFontLoader::update()
  59 {
  60         unload();
  61 }
  62
  63
  64 // Unload all fonts
  65 void xftFontLoader::unload()
  66 {
  67         // Unload all fonts
  68         for (int i1 = 0; i1 < LyXFont::NUM_FAMILIES; ++i1)
  69                 for (int i2 = 0; i2 < 2; ++i2)
  70                         for (int i3 = 0; i3 < 4; ++i3)
  71                                 for (int i4 = 0; i4 < 10; ++i4) {
  72                                         if (fonts_[i1][i2][i3][i4]){
  73                                                 XftFontClose(getDisplay(), fonts_[i1][i2][i3][i4]);
  74                                                 fonts_[i1][i2][i3][i4] = 0;
  75                                         }
  76                                 }
  77 }
  78
  79
  80 string xftFontLoader::familyString(LyXFont::FONT_FAMILY family)
  81 {
  82         string ffamily;
  83         switch (family) {
  84         case LyXFont::ROMAN_FAMILY:
  85                 ffamily = lyxrc.roman_font_name;
  86                 break;
  87         case LyXFont::SANS_FAMILY:
  88                 ffamily = lyxrc.sans_font_name;
  89                 break;
  90         case LyXFont::TYPEWRITER_FAMILY:
  91                 ffamily = lyxrc.typewriter_font_name;
  92                 break;
  93         case LyXFont::CMR_FAMILY:
  94                 ffamily = "cmr10";
  95                 break;
  96         case LyXFont::CMSY_FAMILY:
  97                 ffamily = "cmsy10";
  98                 break;
  99         case LyXFont::CMM_FAMILY:
 100                 ffamily = "cmmi10";
 101                 break;
 102         case LyXFont::CMEX_FAMILY:
 103                 ffamily = "cmex10";
 104                 break;
 105         case LyXFont::MSA_FAMILY:
 106                 ffamily = "msam10";
 107                 break;
 108         case LyXFont::MSB_FAMILY:
 109                 ffamily = "msbm10";
 110                 break;
 111         default:
 112                 ffamily = "Sans";
 113                 break;
 114         }
 115         return ffamily;
 116 }
 117
 118
 119 // Get font pattern
 120 /* Takes care of finding which font that can match the given request. Tries
 121 different alternatives. */
 122 XftPattern * xftFontLoader::getFontPattern(LyXFont::FONT_FAMILY family,
 123                                           LyXFont::FONT_SERIES series,
 124                                           LyXFont::FONT_SHAPE shape,
 125                                           LyXFont::FONT_SIZE size)
 126 {
 127         // Normal font. Let's search for an existing name that matches.
 128         string ffamily;
 129         int fweight;
 130         int fslant;
 131         double fsize = lyxrc.font_sizes[size] * lyxrc.zoom / 100.0;
 132         XftPattern *fpat = XftPatternCreate();
 133
 134         ffamily = familyString(family);
 135         switch (series) {
 136         case LyXFont::MEDIUM_SERIES:
 137                 fweight = XFT_WEIGHT_MEDIUM;
 138                 break;
 139         case LyXFont::BOLD_SERIES:
 140                 fweight = XFT_WEIGHT_BOLD;
 141                 break;
 142         default:
 143                 fweight = XFT_WEIGHT_MEDIUM;
 144                 break;
 145         }
 146
 147         switch (shape) {
 148         case LyXFont::UP_SHAPE:
 149         case LyXFont::SMALLCAPS_SHAPE:
 150                 fslant = XFT_SLANT_ROMAN;
 151                 break;
 152         case LyXFont::ITALIC_SHAPE:
 153                 fslant = XFT_SLANT_ITALIC;
 154                 break;
 155         case LyXFont::SLANTED_SHAPE:
 156                 fslant = XFT_SLANT_OBLIQUE;
 157                 break;
 158         default:
 159                 fslant = XFT_SLANT_ROMAN;
 160                 break;
 161         }
 162         XftPatternAddString(fpat, XFT_FAMILY, ffamily.c_str());
 163         XftPatternAddInteger(fpat, XFT_WEIGHT, fweight);
 164         XftPatternAddInteger(fpat, XFT_SLANT, fslant);
 165         XftPatternAddDouble(fpat, XFT_SIZE, fsize);
 166         return fpat;
 167 }
 168
 169
 170 /// Do load font
 171 XftFont * xftFontLoader::doLoad(LyXFont::FONT_FAMILY family,
 172                                LyXFont::FONT_SERIES series,
 173                                LyXFont::FONT_SHAPE shape,
 174                                LyXFont::FONT_SIZE size)
 175 {
 176         XftPattern * fpat = getFontPattern(family, series, shape, size);
 177         XftResult result;
 178         XftPattern * fpat2 = XftFontMatch(getDisplay(), getScreen(),
 179                                           fpat, &result);
 180         XftFont * font = XftFontOpenPattern(getDisplay(), fpat2);
 181         fonts_[family][series][shape][size] = font;
 182         return font;
 183 }
 184
 185
 186 bool xftFontLoader::available(LyXFont const & f)
 187 {
 188         if (!lyx_gui::use_gui)
 189                 return false;
 190
 191         static std::vector<bool> cache_set(LyXFont::NUM_FAMILIES, false);
 192         static std::vector<bool> cache(LyXFont::NUM_FAMILIES, false);
 193
 194         LyXFont::FONT_FAMILY family = f.family();
 195         if (cache_set[family])
 196                 return cache[family];
 197         cache_set[family] = true;
 198
 199         string const ffamily = familyString(family);
 200         if (isSpecial(f)) {
 201                 cache_set[family] = true;
 202                 XftPattern * fpat = XftPatternCreate();
 203                 XftPatternAddString(fpat, XFT_FAMILY, ffamily.c_str());
 204                 XftResult result;
 205                 XftPattern * fpat2 = XftFontMatch(getDisplay(), getScreen(),
 206                                                   fpat, &result);
 207                 XftPatternDestroy(fpat);
 208                 char * familyM;
 209                 XftPatternGetString(fpat2, XFT_FAMILY, 0, &familyM);
 210                 if (ffamily == familyM) {
 211                         cache[family] = true;
 212                         return true;
 213                 }
 214                 // We don't need to set cache[family] to false, as it
 215                 // is initialized to false;
 216                 return false;
 217         }
 218         // We don't care about non-symbol fonts
 219         return false;
 220 }