/*

 * Copyright (c) 2007, 2008, 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.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import sun.awt.Win32GraphicsConfig;

import sun.awt.windows.WComponentPeer;

import sun.java2d.d3d.D3DScreenUpdateManager;

import sun.java2d.windows.WindowsFlags;

/**

 * This class handles the creation of on-screen surfaces and

 * corresponding graphics objects.

 *

 * By default it delegates the surface creation to the

 * particular GraphicsConfiguration classes.

 */

public class ScreenUpdateManager {

    private static ScreenUpdateManager theInstance;

    protected ScreenUpdateManager() {

    }

    /**

     * Creates a SunGraphics2D object for the surface,

     * given the parameters.

     *

     * @param sd surface data for which a graphics is to be created

     * @param peer peer which owns the surface

     * @param fgColor fg color to be used in the graphics

     * @param bgColor bg color to be used in the graphics

     * @param font font to be used in the graphics

     * @return a SunGraphics2D object for rendering to the passed surface

     */

    public synchronized Graphics2D createGraphics(SurfaceData sd,

            WComponentPeer peer, Color fgColor, Color bgColor, Font font)

    {

        return new SunGraphics2D(sd, fgColor, bgColor, font);

    }

    /**

     * Creates and returns the surface for the peer. This surface becomes

     * managed by this manager. To remove the surface from the managed list

     * {@code}dropScreenSurface(SurfaceData){@code} will need to be called.

     *

     * The default implementation delegates surface creation

     * to the passed in GraphicsConfiguration object.

     *

     * @param gc graphics configuration for which the surface is to be created

     * @param peer peer for which the onscreen surface is to be created

     * @param bbNum number of back-buffers requested for this peer

     * @param isResize whether this surface is being created in response to

     * a component resize event

     * @return a SurfaceData to be used for on-screen rendering for this peer.

     * @see #dropScreenSurface(SurfaceData)

     */

    public SurfaceData createScreenSurface(Win32GraphicsConfig gc,

                                           WComponentPeer peer, int bbNum,

                                           boolean isResize)

    {

        return gc.createSurfaceData(peer, bbNum);

    }

    /**

     * Drops the passed surface from the list of managed surfaces.

     *

     * Nothing happens if the surface wasn't managed by this manager.

     *

     * @param sd SurfaceData to be removed from the list of managed surfaces

     */

    public void dropScreenSurface(SurfaceData sd) {}

    /**

     * Returns a replacement SurfaceData for the invalid passed one.

     *

     * This method should be used by SurfaceData's created by

     * the ScreenUpdateManager for providing replacement surfaces.

     *

     * @param peer to which the old surface belongs

     * @param oldsd the old (invalid) surface to get replaced

     * @return a replacement surface

     * @see sun.java2d.d3d.D3DSurfaceData.D3DWindowSurfaceData#getReplacement()

     * @see sun.java2d.windows.GDIWindowSurfaceData#getReplacement()

     */

    public SurfaceData getReplacementScreenSurface(WComponentPeer peer,

                                                   SurfaceData oldsd)

    {

        SurfaceData surfaceData = peer.getSurfaceData();

            return surfaceData;

        }

        peer.replaceSurfaceData();

        return peer.getSurfaceData();

    }

    /**

     * Returns an (singleton) instance of the screen surfaces

     * manager class.

     * @return instance of onscreen surfaces manager

     */

    public static synchronized ScreenUpdateManager getInstance() {

        if (theInstance == null) {

            if (WindowsFlags.isD3DEnabled()) {

                theInstance = new D3DScreenUpdateManager();

            } else {

                theInstance = new ScreenUpdateManager();

            }

        }

        return theInstance;

    }

}