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/* * @(#)BufferCapabilities.java 1.10 06/04/07 * * Copyright 2006 Sun Microsystems, Inc. All rights reserved. * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms. */ package java.awt; /** * Capabilities and properties of buffers. * * @see java.awt.image.BufferStrategy#getCapabilities() * @see GraphicsConfiguration#getBufferCapabilities * @author Michael Martak * @since 1.4 */ public class BufferCapabilities implements Cloneable { private ImageCapabilities frontCaps; private ImageCapabilities backCaps; private FlipContents flipContents; /** * Creates a new object for specifying buffering capabilities * @param frontCaps the capabilities of the front buffer; cannot be * <code>null</code> * @param backCaps the capabilities of the back and intermediate buffers; * cannot be <code>null</code> * @param flipContents the contents of the back buffer after page-flipping, * <code>null</code> if page flipping is not used (implies blitting) * @exception IllegalArgumentException if frontCaps or backCaps are * <code>null</code> */ public BufferCapabilities(ImageCapabilities frontCaps, ImageCapabilities backCaps, FlipContents flipContents) { if (frontCaps == null || backCaps == null) { throw new IllegalArgumentException( "Image capabilities specified cannot be null"); } this.frontCaps = frontCaps; this.backCaps = backCaps; this.flipContents = flipContents; } /** * @return the image capabilities of the front (displayed) buffer */ public ImageCapabilities getFrontBufferCapabilities() { return frontCaps; } /** * @return the image capabilities of all back buffers (intermediate buffers * are considered back buffers) */ public ImageCapabilities getBackBufferCapabilities() { return backCaps; } /** * @return whether or not the buffer strategy uses page flipping; a set of * buffers that uses page flipping * can swap the contents internally between the front buffer and one or * more back buffers by switching the video pointer (or by copying memory * internally). A non-flipping set of * buffers uses blitting to copy the contents from one buffer to * another; when this is the case, <code>getFlipContents</code> returns * <code>null</code> */ public boolean isPageFlipping() { return (getFlipContents() != null); } /** * @return the resulting contents of the back buffer after page-flipping. * This value is <code>null</code> when the <code>isPageFlipping</code> * returns <code>false</code>, implying blitting. It can be one of * <code>FlipContents.UNDEFINED</code> * (the assumed default), <code>FlipContents.BACKGROUND</code>, * <code>FlipContents.PRIOR</code>, or * <code>FlipContents.COPIED</code>. * @see #isPageFlipping * @see FlipContents#UNDEFINED * @see FlipContents#BACKGROUND * @see FlipContents#PRIOR * @see FlipContents#COPIED */ public FlipContents getFlipContents() { return flipContents; } /** * @return whether page flipping is only available in full-screen mode. If this * is <code>true</code>, full-screen exclusive mode is required for * page-flipping. * @see #isPageFlipping * @see GraphicsDevice#setFullScreenWindow */ public boolean isFullScreenRequired() { return false; } /** * @return whether or not * page flipping can be performed using more than two buffers (one or more * intermediate buffers as well as the front and back buffer). * @see #isPageFlipping */ public boolean isMultiBufferAvailable() { return false; } /** * @return a copy of this BufferCapabilities object. */ public Object clone() { try { return super.clone(); } catch (CloneNotSupportedException e) { // Since we implement Cloneable, this should never happen throw new InternalError(); } } // Inner class FlipContents /** * A type-safe enumeration of the possible back buffer contents after * page-flipping * @since 1.4 */ public static final class FlipContents extends AttributeValue { private static int I_UNDEFINED = 0; private static int I_BACKGROUND = 1; private static int I_PRIOR = 2; private static int I_COPIED = 3; private static final String NAMES[] = { "undefined", "background", "prior", "copied" }; /** * When flip contents are <code>UNDEFINED</code>, the * contents of the back buffer are undefined after flipping. * @see #isPageFlipping * @see #getFlipContents * @see #BACKGROUND * @see #PRIOR * @see #COPIED */ public static final FlipContents UNDEFINED = new FlipContents(I_UNDEFINED); /** * When flip contents are <code>BACKGROUND</code>, the * contents of the back buffer are cleared with the background color after * flipping. * @see #isPageFlipping * @see #getFlipContents * @see #UNDEFINED * @see #PRIOR * @see #COPIED */ public static final FlipContents BACKGROUND = new FlipContents(I_BACKGROUND); /** * When flip contents are <code>PRIOR</code>, the * contents of the back buffer are the prior contents of the front buffer * (a true page flip). * @see #isPageFlipping * @see #getFlipContents * @see #UNDEFINED * @see #BACKGROUND * @see #COPIED */ public static final FlipContents PRIOR = new FlipContents(I_PRIOR); /** * When flip contents are <code>COPIED</code>, the * contents of the back buffer are copied to the front buffer when * flipping. * @see #isPageFlipping * @see #getFlipContents * @see #UNDEFINED * @see #BACKGROUND * @see #PRIOR */ public static final FlipContents COPIED = new FlipContents(I_COPIED); private FlipContents(int type) { super(type, NAMES); } } // Inner class FlipContents }