You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
87 lines
3.1 KiB
87 lines
3.1 KiB
/*
|
|
* Copyright (c) 1997, 1998, Oracle and/or its affiliates. All rights reserved.
|
|
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*
|
|
*/
|
|
|
|
package java.awt;
|
|
|
|
import java.awt.image.ColorModel;
|
|
|
|
/**
|
|
* The <code>Composite</code> interface, along with
|
|
* {@link CompositeContext}, defines the methods to compose a draw
|
|
* primitive with the underlying graphics area.
|
|
* After the <code>Composite</code> is set in the
|
|
* {@link Graphics2D} context, it combines a shape, text, or an image
|
|
* being rendered with the colors that have already been rendered
|
|
* according to pre-defined rules. The classes
|
|
* implementing this interface provide the rules and a method to create
|
|
* the context for a particular operation.
|
|
* <code>CompositeContext</code> is an environment used by the
|
|
* compositing operation, which is created by the <code>Graphics2D</code>
|
|
* prior to the start of the operation. <code>CompositeContext</code>
|
|
* contains private information and resources needed for a compositing
|
|
* operation. When the <code>CompositeContext</code> is no longer needed,
|
|
* the <code>Graphics2D</code> object disposes of it in order to reclaim
|
|
* resources allocated for the operation.
|
|
* <p>
|
|
* Instances of classes implementing <code>Composite</code> must be
|
|
* immutable because the <code>Graphics2D</code> does not clone
|
|
* these objects when they are set as an attribute with the
|
|
* <code>setComposite</code> method or when the <code>Graphics2D</code>
|
|
* object is cloned. This is to avoid undefined rendering behavior of
|
|
* <code>Graphics2D</code>, resulting from the modification of
|
|
* the <code>Composite</code> object after it has been set in the
|
|
* <code>Graphics2D</code> context.
|
|
* <p>
|
|
* Since this interface must expose the contents of pixels on the
|
|
* target device or image to potentially arbitrary code, the use of
|
|
* custom objects which implement this interface when rendering directly
|
|
* to a screen device is governed by the <code>readDisplayPixels</code>
|
|
* {@link AWTPermission}. The permission check will occur when such
|
|
* a custom object is passed to the <code>setComposite</code> method
|
|
* of a <code>Graphics2D</code> retrieved from a {@link Component}.
|
|
* @see AlphaComposite
|
|
* @see CompositeContext
|
|
* @see Graphics2D#setComposite
|
|
*/
|
|
public interface Composite {
|
|
|
|
/**
|
|
* Creates a context containing state that is used to perform
|
|
* the compositing operation. In a multi-threaded environment,
|
|
* several contexts can exist simultaneously for a single
|
|
* <code>Composite</code> object.
|
|
* @param srcColorModel the {@link ColorModel} of the source
|
|
* @param dstColorModel the <code>ColorModel</code> of the destination
|
|
* @param hints the hint that the context object uses to choose between
|
|
* rendering alternatives
|
|
* @return the <code>CompositeContext</code> object used to perform the
|
|
* compositing operation.
|
|
*/
|
|
public CompositeContext createContext(ColorModel srcColorModel,
|
|
ColorModel dstColorModel,
|
|
RenderingHints hints);
|
|
|
|
}
|