Пример #1
0
 public PhysicalFont getSlotFont(int slot) {
   /* This is essentially the runtime overhead for deferred font
    * initialisation: a boolean test on obtaining a slot font,
    * which will happen per slot, on initialisation of a strike
    * (as that is the only frequent call site of this method.
    */
   if (deferredInitialisation[slot]) {
     doDeferredInitialisation(slot);
   }
   SunFontManager fm = SunFontManager.getInstance();
   try {
     PhysicalFont font = components[slot];
     if (font == null) {
       try {
         font =
             (PhysicalFont)
                 fm.findFont2D(componentNames[slot], style, FontManager.PHYSICAL_FALLBACK);
         components[slot] = font;
       } catch (ClassCastException cce) {
         font = fm.getDefaultPhysicalFont();
       }
     }
     return font;
   } catch (Exception e) {
     return fm.getDefaultPhysicalFont();
   }
 }
Пример #2
0
  /* This is used for deferred initialisation, so that the components of
   * a logical font are initialised only when the font is used.
   * This can have a positive impact on start-up of most UI applications.
   * Note that this technique cannot be used with a TTC font as it
   * doesn't know which font in the collection is needed. The solution to
   * this is that the initialisation checks if the returned font is
   * really the one it wants by comparing the name against the name that
   * was passed in (if none was passed in then you aren't using a TTC
   * as you would have to specify the name in such a case).
   * Assuming there's only two or three fonts in a collection then it
   * may be sufficient to verify the returned name is the expected one.
   * But half the time it won't be. However since initialisation of the
   * TTC will initialise all its components then just do a findFont2D call
   * to locate the right one.
   * This code allows for initialisation of each slot on demand.
   * There are two issues with this.
   * 1) All metrics slots probably may be initialised anyway as many
   * apps will query the overall font metrics. However this is not an
   * absolute requirement
   * 2) Some font configuration files on Solaris reference two versions
   * of a TT font: a Latin-1 version, then a Pan-European version.
   * One from /usr/openwin/lib/X11/fonts/TrueType, the other from
   * a euro_fonts directory which is symlinked from numerous locations.
   * This is difficult to avoid because the two do not share XLFDs so
   * both will be consequently mapped by separate XLFDs needed by AWT.
   * The difficulty this presents for lazy initialisation is that if
   * all the components are not mapped at once, the smaller version may
   * have been used only to be replaced later, and what is the consequence
   * for a client that displayed the contents of this font already.
   * After some thought I think this will not be a problem because when
   * client tries to display a glyph only in the Euro font, the composite
   * will ask all components of this font for that glyph and will get
   * the euro one. Subsequent uses will all come from the 100% compatible
   * euro one.
   */
  private void doDeferredInitialisation(int slot) {
    if (deferredInitialisation[slot] == false) {
      return;
    }

    /* Synchronize on FontManager so that is the global lock
     * to update its static set of deferred fonts.
     * This global lock is rarely likely to be an issue as there
     * are only going to be a few calls into this code.
     */
    SunFontManager fm = SunFontManager.getInstance();
    synchronized (fm) {
      if (componentNames == null) {
        componentNames = new String[numSlots];
      }
      if (components[slot] == null) {
        /* Warning: it is possible that the returned component is
         * not derived from the file name argument, this can happen if:
         * - the file can't be found
         * - the file has a bad font
         * - the font in the file is superseded by a more complete one
         * This should not be a problem for composite font as it will
         * make no further use of this file, but code debuggers/
         * maintainers need to be conscious of this possibility.
         */
        if (componentFileNames != null && componentFileNames[slot] != null) {
          components[slot] = fm.initialiseDeferredFont(componentFileNames[slot]);
        }

        if (components[slot] == null) {
          components[slot] = fm.getDefaultPhysicalFont();
        }
        String name = components[slot].getFontName(null);
        if (componentNames[slot] == null) {
          componentNames[slot] = name;
        } else if (!componentNames[slot].equalsIgnoreCase(name)) {
          /* If a component specifies the file with a bad font,
           * the corresponding slot will be initialized by
           * default physical font. In such case findFont2D may
           * return composite font which cannot be casted to
           * physical font.
           */
          try {
            components[slot] =
                (PhysicalFont)
                    fm.findFont2D(componentNames[slot], style, FontManager.PHYSICAL_FALLBACK);
          } catch (ClassCastException cce) {
            /* Assign default physical font to the slot */
            components[slot] = fm.getDefaultPhysicalFont();
          }
        }
      }
      deferredInitialisation[slot] = false;
    }
  }