Пример #1
0
 /**
  * This method is called on a destination SurfaceData to choose the best SurfaceData from a source
  * Image for an imaging operation, with help from its SurfaceManager. The method may determine
  * that the default SurfaceData was really the best choice in the first place, or it may decide to
  * use a cached surface. Some general decisions about whether acceleration is enabled are made by
  * this method, but any decision based on the type of the source image is made in the makeProxyFor
  * method below when it comes up with the appropriate SurfaceDataProxy instance. The parameters
  * describe the type of imaging operation being performed.
  *
  * <p>If a blitProxyKey was supplied by the subclass then it is used to potentially override the
  * choice of source SurfaceData. The outline of this process is:
  *
  * <ol>
  *   <li>Image pipeline asks destSD to find an appropriate srcSD for a given source Image object.
  *   <li>destSD gets the SurfaceManager of the source Image and first retrieves the default SD
  *       from it using getPrimarySurfaceData()
  *   <li>destSD uses its "blit proxy key" (if set) to look for some cached data stored in the
  *       source SurfaceManager
  *   <li>If the cached data is null then makeProxyFor() is used to create some cached data which
  *       is stored back in the source SurfaceManager under the same key for future uses.
  *   <li>The cached data will be a SurfaceDataProxy object.
  *   <li>The SurfaceDataProxy object is then consulted to return a replacement SurfaceData object
  *       (typically a cached copy if appropriate, or the original if not).
  * </ol>
  */
 public SurfaceData getSourceSurfaceData(
     Image img, int txtype, CompositeType comp, Color bgColor) {
   SurfaceManager srcMgr = SurfaceManager.getManager(img);
   SurfaceData srcData = srcMgr.getPrimarySurfaceData();
   if (img.getAccelerationPriority() > 0.0f && blitProxyKey != null) {
     SurfaceDataProxy sdp = (SurfaceDataProxy) srcMgr.getCacheData(blitProxyKey);
     if (sdp == null || !sdp.isValid()) {
       if (srcData.getState() == State.UNTRACKABLE) {
         sdp = SurfaceDataProxy.UNCACHED;
       } else {
         sdp = makeProxyFor(srcData);
       }
       srcMgr.setCacheData(blitProxyKey, sdp);
     }
     srcData = sdp.replaceData(srcData, txtype, comp, bgColor);
   }
   return srcData;
 }
Пример #2
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 /**
  * Restores the contents of the given Image and then returns the new SurfaceData object in use by
  * the Image's SurfaceManager.
  */
 public static SurfaceData restoreContents(Image img) {
   SurfaceManager sMgr = SurfaceManager.getManager(img);
   return sMgr.restoreContents();
 }
Пример #3
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 /**
  * Extracts the SurfaceManager from the given Image, and then returns the SurfaceData object that
  * would best be suited as the destination surface in some rendering operation.
  */
 public static SurfaceData getPrimarySurfaceData(Image img) {
   SurfaceManager sMgr = SurfaceManager.getManager(img);
   return sMgr.getPrimarySurfaceData();
 }