Implementation - MIME Icon Loading

This is a sample implementation to demonstrate how to load the icon for a given MIME-type using various fallbacks (using both new standard icon names, as used by ROX currently, and old-style gnome icon names). The implementation is easy and very straight-forward.

Add KDE icon name support (most probably using a simple hash table based translation)?

static FilerIconCacheEntry*
filer_mime_icon_load (FilerIcon    *icon,
                      FilerIconSize size)
{
  FilerIconCacheEntry *entry;
  FilerMimeIcon       *mime_icon = FILER_MIME_ICON (icon);
  const gchar         *sp;
  gchar                name[256];
  gchar               *tp;
 
  /* try full qualified icon name first (standard) */
  for (sp = "mime-", tp = name; *sp != '\0'; *tp++ = *sp++);
  for (sp = mime_icon->name; *sp != '\0' && tp < name + 255; ++sp, ++tp)
    *tp = (G_UNLIKELY (*sp == '/')) ? ':' : *sp;
  *tp = '\0';
 
  entry = filer_mime_icon_tryload (mime_icon, size, name);
  if (entry == NULL)
    {
      /* retry with only the media icon name (standard) */
      for (tp = name + 6; *tp != '\0'; ++tp)
        if (*tp == ':')
          {
            *tp = '\0';
            break;
          }
 
      entry = filer_mime_icon_tryload (mime_icon, size, name);
      if (entry == NULL)
        {
          /* try full qualified icon name (gnome) */
          for (sp = "gnome-mime-", tp = name; *sp != '\0'; *tp++ = *sp++);
          for (sp = mime_icon->name; *sp != '\0' && tp < name + 255; ++sp, ++tp)
            *tp = (G_UNLIKELY (*sp == '/')) ? '-' : *sp;
          *tp = '\0';
 
          entry = filer_mime_icon_tryload (mime_icon, size, name);
          if (entry == NULL)
            {
              /* retry with only the media icon name (gnome) */
              for (sp = mime_icon->name, tp = name + 11; *sp != '\0' && tp < name + 255; ++sp, ++tp)
                if (G_UNLIKELY (*sp == '/'))
                  break;
                else
                  *tp = *sp;
              *tp = '\0';
 
              entry = filer_mime_icon_tryload (mime_icon, size, name);
              if (entry == NULL)
                {
                  /* retry with application/octect-stream (standard) */
                  entry = filer_mime_icon_tryload (mime_icon, size,
                                                   "mime-application:octet-stream");
                  if (entry == NULL)
                    {
                      /* ...and the gnome application/octect-stream */
                      entry = filer_mime_icon_tryload (mime_icon, size,
                                                       "gnome-mime-application-octet-stream");
                    }
                }
            }
        }
    }
 
#ifdef FILER_DEBUG_INTERNALS
  g_assert (FILER_IS_ICON_CACHE_ENTRY (entry));
#endif
 
  return entry;
}
 
 
 
static FilerIconCacheEntry*
filer_mime_icon_tryload (FilerMimeIcon *mime_icon,
                         FilerIconSize  size,
                         const gchar   *name)
{
  FilerIconCacheEntry *entry;
  GdkPixbuf           *pixbuf;
 
  entry = filer_icon_cache_lookup (FILER_ICON (mime_icon)->cache,
                                   size, FILER_ICON_THEMED, name);
  if (entry == NULL)
    {
      pixbuf = gtk_icon_theme_load_icon (mime_icon->theme, name, 
                                         filer_icon_sizes[size],
                                         0, NULL);
      if (pixbuf == NULL)
        return NULL;
 
      entry = filer_icon_cache_insert (FILER_ICON (mime_icon)->cache, size,
                                       FILER_ICON_THEMED, name, pixbuf);
    }
 
  return entry;
}