/*

 * 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;

    }

}