CompositeContext


1   /*
2    * @(#)CompositeContext.java    1.25 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package java.awt;
9   
10  import java.awt.image.Raster  ;
11  import java.awt.image.WritableRaster  ;
12  
13  /**
14   * The <code>CompositeContext</code> interface defines the encapsulated
15   * and optimized environment for a compositing operation.
16   * <code>CompositeContext</code> objects maintain state for
17   * compositing operations.  In a multi-threaded environment, several
18   * contexts can exist simultaneously for a single {@link Composite} 
19   * object.
20   * @see Composite
21   * @version 10 Feb 1997
22   */
23  
24  public interface CompositeContext {
25      /**
26       * Releases resources allocated for a context.
27       */
28      public void dispose();
29  
30      /**
31       * Composes the two source {@link Raster} objects and 
32       * places the result in the destination 
33       * {@link WritableRaster}.  Note that the destination 
34       * can be the same object as either the first or second 
35       * source. Note that <code>dstIn</code> and 
36       * <code>dstOut</code> must be compatible with the 
37       * <code>dstColorModel</code> passed to the 
38       * {@link Composite#createContext(java.awt.image.ColorModel, java.awt.image.ColorModel, java.awt.RenderingHints) createContext} 
39       * method of the <code>Composite</code> interface.
40       * @param src the first source for the compositing operation
41       * @param dstIn the second source for the compositing operation
42       * @param dstOut the <code>WritableRaster</code> into which the 
43       * result of the operation is stored
44       * @see Composite
45       */
46      public void compose(Raster   src,
47                          Raster   dstIn,
48              WritableRaster   dstOut);
49  
50  
51  }
52  
53
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