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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @author Alexey A. Petrenko
* @version $Revision$
*/
package java.awt;
/**
* The BufferCapabilities class represents the capabilities and other properties
* of the image buffers.
*
* @since Android 1.0
*/
public class BufferCapabilities implements Cloneable {
/**
* The front buffer capabilities.
*/
private final ImageCapabilities frontBufferCapabilities;
/**
* The back buffer capabilities.
*/
private final ImageCapabilities backBufferCapabilities;
/**
* The flip contents.
*/
private final FlipContents flipContents;
/**
* Instantiates a new BufferCapabilities object.
*
* @param frontBufferCapabilities
* the front buffer capabilities, can not be null.
* @param backBufferCapabilities
* the the back and intermediate buffers capabilities, can not be
* null.
* @param flipContents
* the back buffer contents after page flipping, null if page
* flipping is not used.
*/
public BufferCapabilities(ImageCapabilities frontBufferCapabilities,
ImageCapabilities backBufferCapabilities, FlipContents flipContents) {
if (frontBufferCapabilities == null || backBufferCapabilities == null) {
throw new IllegalArgumentException();
}
this.frontBufferCapabilities = frontBufferCapabilities;
this.backBufferCapabilities = backBufferCapabilities;
this.flipContents = flipContents;
}
/**
* Returns a copy of the BufferCapabilities object.
*
* @return a copy of the BufferCapabilities object.
*/
@Override
public Object clone() {
return new BufferCapabilities(frontBufferCapabilities, backBufferCapabilities, flipContents);
}
/**
* Gets the image capabilities of the front buffer.
*
* @return the ImageCapabilities object represented capabilities of the
* front buffer.
*/
public ImageCapabilities getFrontBufferCapabilities() {
return frontBufferCapabilities;
}
/**
* Gets the image capabilities of the back buffer.
*
* @return the ImageCapabilities object represented capabilities of the back
* buffer.
*/
public ImageCapabilities getBackBufferCapabilities() {
return backBufferCapabilities;
}
/**
* Gets the flip contents of the back buffer after page-flipping.
*
* @return the FlipContents of the back buffer after page-flipping.
*/
public FlipContents getFlipContents() {
return flipContents;
}
/**
* Checks if the buffer strategy uses page flipping.
*
* @return true, if the buffer strategy uses page flipping, false otherwise.
*/
public boolean isPageFlipping() {
return flipContents != null;
}
/**
* Checks if page flipping is only available in full-screen mode.
*
* @return true, if page flipping is only available in full-screen mode,
* false otherwise.
*/
public boolean isFullScreenRequired() {
return false;
}
/**
* Checks if page flipping can be performed using more than two buffers.
*
* @return true, if page flipping can be performed using more than two
* buffers, false otherwise.
*/
public boolean isMultiBufferAvailable() {
return false;
}
/**
* The FlipContents class represents a set of possible back buffer contents
* after page-flipping.
*
* @since Android 1.0
*/
public static final class FlipContents {
/**
* The back buffered contents are cleared with the background color
* after flipping.
*/
public static final FlipContents BACKGROUND = new FlipContents();
/**
* The back buffered contents are copied to the front buffer before
* flipping.
*/
public static final FlipContents COPIED = new FlipContents();
/**
* The back buffer contents are the prior contents of the front buffer.
*/
public static final FlipContents PRIOR = new FlipContents();
/**
* The back buffer contents are undefined after flipping
*/
public static final FlipContents UNDEFINED = new FlipContents();
/**
* Instantiates a new flip contents.
*/
private FlipContents() {
}
/**
* Returns the hash code of the FlipContents object.
*
* @return the hash code of the FlipContents object.
*/
@Override
public int hashCode() {
return super.hashCode();
}
/**
* Returns the String representation of the FlipContents object.
*
* @return the string
*/
@Override
public String toString() {
return super.toString();
}
}
}
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