MWOffscreenImage.java

/*
 * @(#)MWOffscreenImage.java	1.20 06/10/10
 *
 * Copyright  1990-2008 Sun Microsystems, Inc. All Rights Reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 only, as published by the Free Software Foundation. 
 * 
 * This program 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 version 2 for more details (a copy is
 * included at /legal/license.txt). 
 * 
 * You should have received a copy of the GNU General Public License
 * version 2 along with this work; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA 
 * 
 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
 * Clara, CA 95054 or visit www.sun.com if you need additional
 * information or have any questions. 
 *
 */

package java.awt;

import java.util.Vector;
import java.awt.image.ImageProducer;
import java.awt.image.ImageObserver;
import java.awt.image.ImageConsumer;
import java.awt.image.ColorModel;

/** @version 1.16, 08/19/02 */


/** An offscreen image created by Component.createImage(int width, int height). As it is not
 possible to create a graphics from an image produced
 through the image producer/consumer model this class exists to allow us to get the graphics
 for an offscreen image. */

class MWOffscreenImage extends MWImage implements ImageProducer {
    Color foreground, background;
    Font font;
    private int originX, originY;
    // We can only have one consumer since we immediately return the data...
    private ImageConsumer theConsumer;
    // 4679080 - create instance of props as in JPEG and GIF image architecture
    private java.util.Hashtable props = new java.util.Hashtable();
    MWOffscreenImage (Component component, int width, int height, MWGraphicsConfiguration gc) {
        super(width, height, gc);
        if (component != null) {
            foreground = component.getForeground();
            background = component.getBackground();
            font = component.getFont();
        }
        // 4679080 - setProperties as n JEPG and GIF architecture.
        setProperties(props);
        /* Clear image to background color. */

        Graphics g = getGraphics();
        g.clearRect(0, 0, width, height);
        g.dispose();
    }

    public void flush() {};
    public Graphics getGraphics() {
        return new MWGraphics (this);
    }

    public ImageProducer getSource() {
        return this;
    }

    public synchronized void addConsumer(ImageConsumer ic) {
        theConsumer = ic;
        startProduction(ic);
    }

    public synchronized boolean isConsumer(ImageConsumer ic) {
        return (ic == theConsumer);
    }

    public synchronized void removeConsumer(ImageConsumer ic) {
        if (theConsumer == ic)
            theConsumer = null;
    }

    public void requestTopDownLeftRightResend(ImageConsumer ic) {}

    public void startProduction(ImageConsumer ic) {
        if (ic == null) return;
        int[] rgbArray;
        ColorModel cm = ColorModel.getRGBdefault();
        ic.setDimensions(width, height);
        ic.setColorModel(cm);
        rgbArray = getRGB(originX, originY, width, height, null, 0, width);
        ic.setPixels(0, 0, width, height, cm, rgbArray, 0, width);
        ic.imageComplete(ImageConsumer.SINGLEFRAMEDONE);
    }
}