/* * Copyright (c) 1996, 2007, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code 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.  Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code 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 in the LICENSE file that * accompanied this code). * * 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package sun.awt.image; import java.awt.Component;import java.awt.Color;import java.awt.SystemColor;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.GraphicsEnvironment;import java.awt.image.BufferedImage;import java.awt.image.ImageProducer;import java.awt.image.ColorModel;import java.awt.image.WritableRaster;import sun.java2d.SunGraphics2D;import sun.java2d.SurfaceData; /** * This is a special variant of BufferedImage that keeps a reference to * a Component.  The Component's foreground and background colors and * default font are used as the defaults for this image. */public class OffScreenImage extends BufferedImage {     protected Component c;    private OffScreenImageSource osis;    private Font defaultFont;     /**     * Constructs an OffScreenImage given a color model and tile,     * for offscreen rendering to be used with a given component.     * The component is used to obtain the foreground color, background     * color and font.     */    public OffScreenImage(Component c, ColorModel cm, WritableRaster raster,                          boolean isRasterPremultiplied)    {        super(cm, raster, isRasterPremultiplied, null);        this.c = c;        initSurface(raster.getWidth(), raster.getHeight());    }     public Graphics getGraphics() {        return createGraphics();    }     public Graphics2D createGraphics() {        if (c == null) {            GraphicsEnvironment env =                GraphicsEnvironment.getLocalGraphicsEnvironment();            return env.createGraphics(this);        }         Color bg = c.getBackground();        if (bg == null) {            bg = SystemColor.window;        }         Color fg = c.getForeground();        if (fg == null) {            fg = SystemColor.windowText;        }         Font font = c.getFont();        if (font == null) {            if (defaultFont == null) {                defaultFont = new Font("Dialog", Font.PLAIN, 12);            }            font = defaultFont;        }         return new SunGraphics2D(SurfaceData.getPrimarySurfaceData(this),                                 fg, bg, font);    }     private void initSurface(int width, int height) {        Graphics2D g2 = createGraphics();        try {            g2.clearRect(0, 0, width, height);        } finally {            g2.dispose();        }    }     public ImageProducer getSource() {        if (osis == null) {            osis = new OffScreenImageSource(this);        }        return osis;    }}