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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: BackBuffer.java,v $
*
* $Revision: 1.5 $
*
* last change: $Author: rt $ $Date: 2005-09-07 23:07:25 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library 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 for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
// UNO
import com.sun.star.uno.UnoRuntime;
import com.sun.star.uno.XComponentContext;
import com.sun.star.uno.AnyConverter;
import com.sun.star.uno.IQueryInterface;
import com.sun.star.lang.XInitialization;
import com.sun.star.lib.uno.helper.WeakBase;
// OOo AWT
import com.sun.star.awt.*;
// Canvas
import com.sun.star.rendering.*;
// Java AWT
import java.awt.*;
import java.awt.image.*;
import java.awt.geom.*;
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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