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