/*

 * Copyright (c) 1997, 1999, 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;

import java.awt.*;

import java.awt.image.*;

/**

 * A class to encapsulate a custom image-based cursor.

 *

 * @author      ThomasBall

 */

public abstract class CustomCursor extends Cursor {

    protected Image image;

    public CustomCursor(Image cursor, Point hotSpot, String name)

            throws IndexOutOfBoundsException {

        super(name);

        image = cursor;

        Toolkit toolkit = Toolkit.getDefaultToolkit();

        // Make sure image is fully loaded.

        Component c = new Canvas(); // for its imageUpdate method

        MediaTracker tracker = new MediaTracker(c);

        tracker.addImage(cursor, 0);

        try {

            tracker.waitForAll();

        } catch (InterruptedException e) {

        }

        int width = cursor.getWidth(c);

        int height = cursor.getHeight(c);

        // Fix for bug 4212593 The Toolkit.createCustomCursor does not

        //                     check absence of the image of cursor

        // If the image is invalid, the cursor will be hidden (made completely

        // transparent). In this case, getBestCursorSize() will adjust negative w and h,

        // but we need to set the hotspot inside the image here.

        if (tracker.isErrorAny() || width < 0 || height < 0) {

              hotSpot.x = hotSpot.y = 0;

        }

        // Scale image to nearest supported size.

        Dimension nativeSize = toolkit.getBestCursorSize(width, height);

        if (nativeSize.width != width || nativeSize.height != height) {

            cursor = cursor.getScaledInstance(nativeSize.width,

                                              nativeSize.height,

                                              Image.SCALE_DEFAULT);

            width = nativeSize.width;

            height = nativeSize.height;

        }

        // Verify that the hotspot is within cursor bounds.

        if (hotSpot.x >= width || hotSpot.y >= height || hotSpot.x < 0 || hotSpot.y < 0) {

            throw new IndexOutOfBoundsException("invalid hotSpot");

        }

        /* Extract ARGB array from image.

         *

         * A transparency mask can be created in native code by checking

         * each pixel's top byte -- a 0 value means the pixel's transparent.

         * Since each platform's format of the bitmap and mask are likely to

         * be different, their creation shouldn't be here.

         */

        int[] pixels = new int[width * height];

        ImageProducer ip = cursor.getSource();

        PixelGrabber pg = new PixelGrabber(ip, 0, 0, width, height,

                                           pixels, 0, width);

        try {

            pg.grabPixels();

        } catch (InterruptedException e) {

        }

        createNativeCursor(image, pixels, width, height, hotSpot.x, hotSpot.y);

    }

    protected abstract void createNativeCursor(Image im,  int[] pixels,

                                               int width, int height,

                                               int xHotSpot, int yHotSpot);

}