JDK8/Java8源码在线阅读

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
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package java.awt.image;

/**
  * 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.
  *
  * @see WritableRenderedImage
  *
  * @author Thomas DeWeese
  * @author Daniel Rice
  */
public interface TileObserver {

  /**
    * A tile is about to be updated (it is either about to be grabbed
    * for writing, or it is being released from writing).
    *
    * @param source the image that owns the tile.
    * @param tileX the X index of the tile that is being updated.
    * @param tileY the Y index of the tile that is being updated.
    * @param willBeWritable  If true, the tile will be grabbed for writing;

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