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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
// Java AWT
import java.awt.*;
import java.awt.image.*;
public class BackBuffer
{
private BufferedImage backBuffer;
//private VolatileImage backBuffer;
private Graphics2D backBufferGraphics;
private Graphics2D referenceDevice;
public BackBuffer( Graphics2D _referenceDevice,
int width,
int height )
{
referenceDevice = _referenceDevice;
setSize( width, height );
}
public Graphics2D getGraphics()
{
return backBufferGraphics;
}
public void setSize( int width,
int height )
{
if( backBuffer != null &&
width == backBuffer.getWidth() &&
height == backBuffer.getHeight() )
{
return;
}
if( backBufferGraphics != null )
backBufferGraphics.dispose();
if( backBuffer != null )
backBuffer.flush();
// TODO: Maybe VolatileImage with another BufferedImage as a backup is
// a tad faster here.
backBuffer = referenceDevice.getDeviceConfiguration().createCompatibleImage(width,
height);
// backBuffer = referenceDevice.getDeviceConfiguration().createCompatibleVolatileImage(width,
// height);
backBufferGraphics = backBuffer.createGraphics();
CanvasUtils.initGraphics( backBufferGraphics );
// clear the buffer to white (to have a defined state here)
backBufferGraphics.setColor( java.awt.Color.white );
backBufferGraphics.fillRect( 0,0,width,height );
}
public void redraw( Graphics2D graph )
{
if( graph != null &&
backBuffer != null )
{
CanvasUtils.printLog("BackBuffer.redraw(): using buffer of size (" +
backBuffer.getWidth() + "," + backBuffer.getHeight() + ")" );
graph.drawImage(backBuffer, 0, 0, null);
// TODO: this is just twiddled to work. I cannot be sure
// that this volatile backbuffer will survive in the first
// place, nor that it wise to leave it in VRAM.
// only flush non-volatile images
// CanvasUtils.postRenderImageTreatment( backBuffer );
}
}
public java.awt.Image getBackBuffer()
{
return backBuffer;
}
public void dispose()
{
backBufferGraphics.dispose();
backBuffer.flush();
}
}
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