Source Code Cross Referenced for Composite.java in  » 6.0-JDK-Core » AWT » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Core » AWT » java.awt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01        /*
02         * Copyright 1997-1998 Sun Microsystems, Inc.  All Rights Reserved.
03         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
04         *
05         * This code is free software; you can redistribute it and/or modify it
06         * under the terms of the GNU General Public License version 2 only, as
07         * published by the Free Software Foundation.  Sun designates this
08         * particular file as subject to the "Classpath" exception as provided
09         * by Sun in the LICENSE file that accompanied this code.
10         *
11         * This code is distributed in the hope that it will be useful, but WITHOUT
12         * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13         * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14         * version 2 for more details (a copy is included in the LICENSE file that
15         * accompanied this code).
16         *
17         * You should have received a copy of the GNU General Public License version
18         * 2 along with this work; if not, write to the Free Software Foundation,
19         * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20         *
21         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22         * CA 95054 USA or visit www.sun.com if you need additional information or
23         * have any questions.
24         */
25
26        package java.awt;
27
28        import java.awt.image.ColorModel;
29
30        /**
31         * The <code>Composite</code> interface, along with 
32         * {@link CompositeContext}, defines the methods to compose a draw
33         * primitive with the underlying graphics area.
34         * After the <code>Composite</code> is set in the 
35         * {@link Graphics2D} context, it combines a shape, text, or an image
36         * being rendered with the colors that have already been rendered
37         * according to pre-defined rules. The classes
38         * implementing this interface provide the rules and a method to create
39         * the context for a particular operation.
40         * <code>CompositeContext</code> is an environment used by the 
41         * compositing operation, which is created by the <code>Graphics2D</code>
42         * prior to the start of the operation.  <code>CompositeContext</code>
43         * contains private information and resources needed for a compositing 
44         * operation.  When the <code>CompositeContext</code> is no longer needed,
45         * the <code>Graphics2D</code> object disposes of it in order to reclaim 
46         * resources allocated for the operation.
47         * <p>
48         * Instances of classes implementing <code>Composite</code> must be 
49         * immutable because the <code>Graphics2D</code> does not clone
50         * these objects when they are set as an attribute with the 
51         * <code>setComposite</code> method or when the <code>Graphics2D</code>
52         * object is cloned.  This is to avoid undefined rendering behavior of 
53         * <code>Graphics2D</code>, resulting from the modification of 
54         * the <code>Composite</code> object after it has been set in the 
55         * <code>Graphics2D</code> context.
56         * <p>
57         * Since this interface must expose the contents of pixels on the
58         * target device or image to potentially arbitrary code, the use of
59         * custom objects which implement this interface when rendering directly
60         * to a screen device is governed by the <code>readDisplayPixels</code>
61         * {@link AWTPermission}.  The permission check will occur when such
62         * a custom object is passed to the <code>setComposite</code> method
63         * of a <code>Graphics2D</code> retrieved from a {@link Component}.
64         * @see AlphaComposite
65         * @see CompositeContext
66         * @see Graphics2D#setComposite
67         * @version 10 Feb 1997
68         */
69        public interface Composite {
70
71            /**
72             * Creates a context containing state that is used to perform
73             * the compositing operation.  In a multi-threaded environment,
74             * several contexts can exist simultaneously for a single
75             * <code>Composite</code> object.
76             * @param srcColorModel  the {@link ColorModel} of the source
77             * @param dstColorModel  the <code>ColorModel</code> of the destination
78             * @param hints the hint that the context object uses to choose between
79             * rendering alternatives
80             * @return the <code>CompositeContext</code> object used to perform the
81             * compositing operation.
82             */
83            public CompositeContext createContext(ColorModel srcColorModel,
84                    ColorModel dstColorModel, RenderingHints hints);
85
86        }
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