/* * 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);}