/*
 * Copyright (c) 2002, 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.java2d;

import java.awt.Rectangle;
import java.awt.image.Raster;
import java.awt.image.ColorModel;
import java.awt.GraphicsConfiguration;

import sun.java2d.StateTrackable.State;
import sun.java2d.loops.SurfaceType;
import sun.java2d.pipe.NullPipe;

This class provides an empty implementation of the SurfaceData
abstract superclass.  All operations on it translate into NOP
or harmless operations.
/**
 * This class provides an empty implementation of the SurfaceData
 * abstract superclass.  All operations on it translate into NOP
 * or harmless operations.
 */
public class NullSurfaceData extends SurfaceData {
    public static final SurfaceData theInstance = new NullSurfaceData();

    private NullSurfaceData() {
        super(State.IMMUTABLE, SurfaceType.Any, ColorModel.getRGBdefault());
    }

    
Sets this SurfaceData object to the invalid state.  All Graphics
objects must get a new SurfaceData object via the refresh method
and revalidate their pipelines before continuing.
/**
     * Sets this SurfaceData object to the invalid state.  All Graphics
     * objects must get a new SurfaceData object via the refresh method
     * and revalidate their pipelines before continuing.
     */
    public void invalidate() {
    }

    
Return a new SurfaceData object that represents the current state
of the destination that this SurfaceData object describes.
This method is typically called when the SurfaceData is invalidated.
/**
     * Return a new SurfaceData object that represents the current state
     * of the destination that this SurfaceData object describes.
     * This method is typically called when the SurfaceData is invalidated.
     */
    public SurfaceData getReplacement() {
        return this;
    }

    private final static NullPipe nullpipe = new NullPipe();

    public void validatePipe(SunGraphics2D sg2d) {
        sg2d.drawpipe = nullpipe;
        sg2d.fillpipe = nullpipe;
        sg2d.shapepipe = nullpipe;
        sg2d.textpipe = nullpipe;
        sg2d.imagepipe = nullpipe;
    }

    public GraphicsConfiguration getDeviceConfiguration() {
        return null;
    }

    
Return a readable Raster which contains the pixels for the
specified rectangular region of the destination surface.
The coordinate origin of the returned Raster is the same as
the device space origin of the destination surface.
In some cases the returned Raster might also be writeable.
In most cases, the returned Raster might contain more pixels
than requested.
See Also:
useTightBBoxes/**
     * Return a readable Raster which contains the pixels for the
     * specified rectangular region of the destination surface.
     * The coordinate origin of the returned Raster is the same as
     * the device space origin of the destination surface.
     * In some cases the returned Raster might also be writeable.
     * In most cases, the returned Raster might contain more pixels
     * than requested.
     *
     * @see useTightBBoxes
     */
    public Raster getRaster(int x, int y, int w, int h) {
        throw new InvalidPipeException("should be NOP");
    }

    
Does the pixel accessibility of the destination surface
suggest that rendering algorithms might want to take
extra time to calculate a more accurate bounding box for
the operation being performed?
The typical case when this will be true is when a copy of
the pixels has to be made when doing a getRaster.  The
fewer pixels copied, the faster the operation will go.
See Also:
getRaster/**
     * Does the pixel accessibility of the destination surface
     * suggest that rendering algorithms might want to take
     * extra time to calculate a more accurate bounding box for
     * the operation being performed?
     * The typical case when this will be true is when a copy of
     * the pixels has to be made when doing a getRaster.  The
     * fewer pixels copied, the faster the operation will go.
     *
     * @see getRaster
     */
    public boolean useTightBBoxes() {
        return false;
    }

    
Returns the pixel data for the specified Argb value packed
into an integer for easy storage and conveyance.
/**
     * Returns the pixel data for the specified Argb value packed
     * into an integer for easy storage and conveyance.
     */
    public int pixelFor(int rgb) {
        return rgb;
    }

    
Returns the Argb representation for the specified integer value
which is packed in the format of the associated ColorModel.
/**
     * Returns the Argb representation for the specified integer value
     * which is packed in the format of the associated ColorModel.
     */
    public int rgbFor(int pixel) {
        return pixel;
    }

    
Returns the bounds of the destination surface.
/**
     * Returns the bounds of the destination surface.
     */
    public Rectangle getBounds() {
        return new Rectangle();
    }

    
Performs Security Permissions checks to see if a Custom
Composite object should be allowed access to the pixels
of this surface.
/**
     * Performs Security Permissions checks to see if a Custom
     * Composite object should be allowed access to the pixels
     * of this surface.
     */
    protected void checkCustomComposite() {
        return;
    }

    
Performs a copyarea within this surface.  Returns
false if there is no algorithm to perform the copyarea
given the current settings of the SunGraphics2D.
/**
     * Performs a copyarea within this surface.  Returns
     * false if there is no algorithm to perform the copyarea
     * given the current settings of the SunGraphics2D.
     */
    public boolean copyArea(SunGraphics2D sg2d,
                            int x, int y, int w, int h, int dx, int dy)
    {
        return true;
    }

    
Returns destination Image associated with this SurfaceData (null)
/**
     * Returns destination Image associated with this SurfaceData (null)
     */
    public Object getDestination() {
        return null;
    }
}