| /* |
| * 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); |
| } |