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