Src/Gtk2/PangoCache.cpp

   1 #include "../Common/Common.h"
   2
   3 #include "PangoCache.h"
   4 #include <iostream>
   5
   6 CPangoCache::CPangoCache(const std::string &strFontName) {
   7   font = pango_font_description_from_string(strFontName.c_str());
   8 }
   9
  10 void CPangoCache::ChangeFont(const std::string &strFontName) {
  11   pango_font_description_free(font);
  12   font = pango_font_description_from_string(strFontName.c_str());
  13
  14   // FIXME - probably need to free the pango layouts, but I can't find a function to do this.
  15
  16   oPangoCache.clear();
  17 }
  18
  19 #if WITH_CAIRO
  20 PangoLayout *CPangoCache::GetLayout(cairo_t *cr, std::string sDisplayText, int iSize) {
  21 #else
  22 PangoLayout *CPangoCache::GetLayout(GtkWidget *pCanvas, std::string sDisplayText, int iSize) {
  23 #endif
  24
  25   // Calculate the name of the pango layout in the cache - this
  26   // includes the display text and the size.
  27
  28    char buffer[128];             // FIXME - what if we exceed this?
  29
  30    snprintf(buffer, 128, "%d_%s", iSize, sDisplayText.c_str());
  31 //   //  std::stringstream sCacheName;
  32 //   //sCacheName << iSize << "_" << sDisplayText;
  33
  34    std::string sCacheName(buffer);
  35
  36   // TODO: This is blatantly not going to work for unicode
  37    //  int iCacheIndex(iSize + 256 * sDisplayText[0]);
  38
  39   // If we haven't got a cached pango layout for this string/size yet,
  40   // create a new one
  41
  42   std::map<std::string, PangoLayout *>::iterator it(oPangoCache.find(sCacheName));
  43
  44   if(it != oPangoCache.end())
  45     return it->second;
  46   else {
  47
  48 #if WITH_CAIRO
  49     PangoLayout *pNewPangoLayout(pango_cairo_create_layout(cr));
  50 #else
  51     PangoLayout *pNewPangoLayout(gtk_widget_create_pango_layout(pCanvas, ""));
  52 #endif
  53
  54     pango_font_description_set_size(font, iSize * PANGO_SCALE);
  55     pango_layout_set_font_description(pNewPangoLayout, font);
  56     pango_layout_set_text(pNewPangoLayout, sDisplayText.c_str(), -1);
  57
  58     oPangoCache[sCacheName] = pNewPangoLayout;
  59
  60     return pNewPangoLayout;
  61   }
  62   return 0;
  63 }