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java.awt.image
public interface: TileObserver [javadoc | source] An interface for objects that wish to be informed when tiles of a WritableRenderedImage become modifiable by some writer via a call to getWritableTile, and when they become unmodifiable via the last call to releaseWritableTile.
Method from java.awt.image.TileObserver Summary:
tileUpdate
Method from java.awt.image.TileObserver Detail:
 public  void tileUpdate(WritableRenderedImage source,
    int tileX,
    int tileY,
    boolean willBeWritable)
    A tile is about to be updated (it is either about to be grabbed for writing, or it is being released from writing).