From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/awt/BufferCapabilities.java | 253 +++++++++++++++++++++ 1 file changed, 253 insertions(+) create mode 100644 libjava/classpath/java/awt/BufferCapabilities.java (limited to 'libjava/classpath/java/awt/BufferCapabilities.java') diff --git a/libjava/classpath/java/awt/BufferCapabilities.java b/libjava/classpath/java/awt/BufferCapabilities.java new file mode 100644 index 000000000..522fdf7f6 --- /dev/null +++ b/libjava/classpath/java/awt/BufferCapabilities.java @@ -0,0 +1,253 @@ +/* BufferCapabilities.java -- double-buffering capabilities descriptor + Copyright (C) 2002, 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package java.awt; + +import java.awt.image.BufferStrategy; + +/** + * A double-buffering capability descriptor. This class exposes + * details about the double-buffering algorithms used by image + * buffers. + * + * BufferCapabilities represents algorithms that involve at least two + * buffers but it can also specify so-called "multi-buffer" schemes + * involving more than two buffers. This class describes the + * capabilities of the front and back buffers as well as the results + * of "flipping" -- that is, what happens when an image is transferred + * from the back buffer to the front buffer. + * + * Flipping may or may not be supported or may be supported only in + * fullscreen mode. If it is not supported then "blitting" is implied + * -- that is, the contents of the back buffer are copied using a fast + * block transfer operation from the back buffer to the front buffer. + * + * The front buffer is the one that is displayed. + * + * @author Eric Blake (ebb9@email.byu.edu) + * + * @see BufferStrategy#getCapabilities() + * @see GraphicsConfiguration#getBufferCapabilities() + * + * @since 1.4 + */ +public class BufferCapabilities implements Cloneable +{ + /** + * A type-safe enumeration of buffer flipping results. + * + * @see AttributeValue + */ + public static final class FlipContents extends AttributeValue + { + /** + * The names of the different flipping results. + */ + private static final String[] NAMES + = { "undefined", "background", "prior", "copied" }; + + /** + * The contents of the back buffer are undefined after flipping. + */ + public static final FlipContents UNDEFINED = new FlipContents(0); + + /** + * The back buffer is cleared with the background color after + * flipping. + */ + public static final FlipContents BACKGROUND = new FlipContents(1); + + /** + * The back buffer contains the pre-flipping contents of the front + * buffer after flipping. In other words a true "flip" has been + * performed. + */ + public static final FlipContents PRIOR = new FlipContents(2); + + /** + * The back buffer has the same contents as the front buffer after + * flipping. + */ + public static final FlipContents COPIED = new FlipContents(3); + + /** + * Create a new flipping result descriptor. + * + * @param value the enumeration value + */ + private FlipContents(int value) + { + super(value, NAMES); + } + } + + /** + * Front buffer capabilities descriptor. + */ + private final ImageCapabilities front; + + /** + * Back buffer capabilities descriptor. + */ + private final ImageCapabilities back; + + /** + * Describes the results of a "flip" operation. + */ + private final FlipContents flip; + + /** + * Creates a buffer capabilities object. + * + * @param frontCaps front buffer capabilities descriptor + * @param backCaps back buffer capabilities descriptor + * @param flip the results of a flip operation or null if + * flipping is not supported + * + * @exception IllegalArgumentException if frontCaps or backCaps is + * null + */ + public BufferCapabilities(ImageCapabilities frontCaps, + ImageCapabilities backCaps, + FlipContents flip) + { + if (frontCaps == null || backCaps == null) + throw new IllegalArgumentException(); + this.front = frontCaps; + this.back = backCaps; + this.flip = flip; + } + + /** + * Retrieve the front buffer's image capabilities. + * + * @return the front buffer's image capabilities + */ + public ImageCapabilities getFrontBufferCapabilities() + { + return front; + } + + /** + * Retrieve the back buffer's image capabilities. + * + * @return the back buffer's image capabilities + */ + public ImageCapabilities getBackBufferCapabilities() + { + return back; + } + + /** + * Return whether or not flipping is supported. + * + * @return true if flipping is supported, false otherwise + */ + public boolean isPageFlipping() + { + return flip != null; + } + + /** + * Retrieve the result of a flipping operation. If this method + * returns null then flipping is not supported. This implies that + * "blitting", a fast block transfer, is used to copy the contents + * of the back buffer to the front buffer. Other possible return + * values are: + * + * + * @return the result of a flipping operation or null if flipping is + * not supported + */ + public FlipContents getFlipContents() + { + return flip; + } + + /** + * Returns true if flipping is only supported in fullscreen mode. + * + * @return true if flipping is only supported in fullscreen mode, + * false otherwise + */ + public boolean isFullScreenRequired() + { + return true; + } + + /** + * Returns true if flipping can involve more than two buffers. One + * or more intermediate buffers may be available in addition to the + * front and back buffers. + * + * @return true if there are more than two buffers available for + * flipping, false otherwise + */ + public boolean isMultiBufferAvailable() + { + return false; + } + + /** + * Clone this buffering capability descriptor. + * + * @return a clone of this buffer capability descriptor + */ + public Object clone() + { + try + { + return super.clone(); + } + catch (CloneNotSupportedException e) + { + throw (Error) new InternalError().initCause(e); + } + } +} -- cgit v1.2.3