jdk/src/share/classes/sun/awt/image/OffScreenImage.java
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/*
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 * Copyright (c) 1996, 2007, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.  Oracle designates this
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 * particular file as subject to the "Classpath" exception as provided
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 * by Oracle in the LICENSE file that accompanied this code.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 */
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package sun.awt.image;
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import java.awt.Component;
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import java.awt.Color;
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import java.awt.SystemColor;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.Graphics2D;
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import java.awt.GraphicsEnvironment;
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import java.awt.image.BufferedImage;
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import java.awt.image.ImageProducer;
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import java.awt.image.ColorModel;
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import java.awt.image.WritableRaster;
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import sun.java2d.SunGraphics2D;
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import sun.java2d.SurfaceData;
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/**
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 * This is a special variant of BufferedImage that keeps a reference to
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 * a Component.  The Component's foreground and background colors and
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 * default font are used as the defaults for this image.
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 */
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public class OffScreenImage extends BufferedImage {
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    protected Component c;
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    private OffScreenImageSource osis;
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    private Font defaultFont;
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    /**
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     * Constructs an OffScreenImage given a color model and tile,
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     * for offscreen rendering to be used with a given component.
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     * The component is used to obtain the foreground color, background
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     * color and font.
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     */
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    public OffScreenImage(Component c, ColorModel cm, WritableRaster raster,
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                          boolean isRasterPremultiplied)
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    {
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        super(cm, raster, isRasterPremultiplied, null);
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        this.c = c;
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        initSurface(raster.getWidth(), raster.getHeight());
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    }
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    public Graphics getGraphics() {
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        return createGraphics();
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    }
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    public Graphics2D createGraphics() {
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        if (c == null) {
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            GraphicsEnvironment env =
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                GraphicsEnvironment.getLocalGraphicsEnvironment();
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            return env.createGraphics(this);
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        }
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        Color bg = c.getBackground();
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        if (bg == null) {
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            bg = SystemColor.window;
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        }
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        Color fg = c.getForeground();
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        if (fg == null) {
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            fg = SystemColor.windowText;
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        }
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        Font font = c.getFont();
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        if (font == null) {
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            if (defaultFont == null) {
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                defaultFont = new Font("Dialog", Font.PLAIN, 12);
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            }
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            font = defaultFont;
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        }
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        return new SunGraphics2D(SurfaceData.getPrimarySurfaceData(this),
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                                 fg, bg, font);
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    }
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    private void initSurface(int width, int height) {
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        Graphics2D g2 = createGraphics();
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        try {
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            g2.clearRect(0, 0, width, height);
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        } finally {
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            g2.dispose();
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        }
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    }
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    public ImageProducer getSource() {
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        if (osis == null) {
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            osis = new OffScreenImageSource(this);
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        }
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        return osis;
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    }
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}