public static void disposeAll() {
   if (screenCache != null) {
     for (ScreenCache sc : screenCache.values()) {
       sc.dispose();
       sc = null;
     }
     screenCache.clear();
   }
 }
 /**
  * 获得当前游戏屏幕截图
  *
  * @param x
  * @param y
  * @param width
  * @param height
  * @return
  */
 public static synchronized LImage toScreenCaptureImage(int x, int y, int width, int height) {
   if (GLEx.gl10 == null) {
     return null;
   }
   if (width < 0) {
     width = 1;
   }
   if (height < 0) {
     height = 1;
   }
   if (x < 0 || x > width) {
     x = 0;
   }
   if (y < 0 || y > height) {
     y = 0;
   }
   int hashCode = 1;
   hashCode = LSystem.unite(hashCode, x);
   hashCode = LSystem.unite(hashCode, y);
   hashCode = LSystem.unite(hashCode, width);
   hashCode = LSystem.unite(hashCode, height);
   if (screenCache.size() > LSystem.DEFAULT_MAX_CACHE_SIZE / 10) {
     for (ScreenCache sc : screenCache.values()) {
       sc.dispose();
       sc = null;
     }
     screenCache.clear();
   }
   ScreenCache cache = screenCache.get(hashCode);
   if (cache == null) {
     cache = new ScreenCache(x, y, width, height);
   } else {
     cache.reset();
   }
   screenCache.put(hashCode, cache);
   cache.commit();
   for (; cache.commit == null; ) {
     try {
       Thread.yield();
     } catch (Exception e) {
     }
   }
   return cache.commit;
 }