J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-1999 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt; |
| 27 | |
| 28 | import java.awt.*; |
| 29 | import java.awt.image.*; |
| 30 | |
| 31 | /** |
| 32 | * A class to encapsulate a custom image-based cursor. |
| 33 | * |
| 34 | * @author ThomasBall |
| 35 | */ |
| 36 | public abstract class CustomCursor extends Cursor { |
| 37 | |
| 38 | protected Image image; |
| 39 | |
| 40 | public CustomCursor(Image cursor, Point hotSpot, String name) |
| 41 | throws IndexOutOfBoundsException { |
| 42 | super(name); |
| 43 | image = cursor; |
| 44 | Toolkit toolkit = Toolkit.getDefaultToolkit(); |
| 45 | |
| 46 | // Make sure image is fully loaded. |
| 47 | Component c = new Canvas(); // for its imageUpdate method |
| 48 | MediaTracker tracker = new MediaTracker(c); |
| 49 | tracker.addImage(cursor, 0); |
| 50 | try { |
| 51 | tracker.waitForAll(); |
| 52 | } catch (InterruptedException e) { |
| 53 | } |
| 54 | int width = cursor.getWidth(c); |
| 55 | int height = cursor.getHeight(c); |
| 56 | |
| 57 | // Fix for bug 4212593 The Toolkit.createCustomCursor does not |
| 58 | // check absence of the image of cursor |
| 59 | // If the image is invalid, the cursor will be hidden (made completely |
| 60 | // transparent). In this case, getBestCursorSize() will adjust negative w and h, |
| 61 | // but we need to set the hotspot inside the image here. |
| 62 | if (tracker.isErrorAny() || width < 0 || height < 0) { |
| 63 | hotSpot.x = hotSpot.y = 0; |
| 64 | } |
| 65 | |
| 66 | // Scale image to nearest supported size. |
| 67 | Dimension nativeSize = toolkit.getBestCursorSize(width, height); |
| 68 | if (nativeSize.width != width || nativeSize.height != height) { |
| 69 | cursor = cursor.getScaledInstance(nativeSize.width, |
| 70 | nativeSize.height, |
| 71 | Image.SCALE_DEFAULT); |
| 72 | width = nativeSize.width; |
| 73 | height = nativeSize.height; |
| 74 | } |
| 75 | |
| 76 | // Verify that the hotspot is within cursor bounds. |
| 77 | if (hotSpot.x >= width || hotSpot.y >= height || hotSpot.x < 0 || hotSpot.y < 0) { |
| 78 | throw new IndexOutOfBoundsException("invalid hotSpot"); |
| 79 | } |
| 80 | |
| 81 | /* Extract ARGB array from image. |
| 82 | * |
| 83 | * A transparency mask can be created in native code by checking |
| 84 | * each pixel's top byte -- a 0 value means the pixel's transparent. |
| 85 | * Since each platform's format of the bitmap and mask are likely to |
| 86 | * be different, their creation shouldn't be here. |
| 87 | */ |
| 88 | int[] pixels = new int[width * height]; |
| 89 | ImageProducer ip = cursor.getSource(); |
| 90 | PixelGrabber pg = new PixelGrabber(ip, 0, 0, width, height, |
| 91 | pixels, 0, width); |
| 92 | try { |
| 93 | pg.grabPixels(); |
| 94 | } catch (InterruptedException e) { |
| 95 | } |
| 96 | |
| 97 | createNativeCursor(image, pixels, width, height, hotSpot.x, hotSpot.y); |
| 98 | } |
| 99 | |
| 100 | protected abstract void createNativeCursor(Image im, int[] pixels, |
| 101 | int width, int height, |
| 102 | int xHotSpot, int yHotSpot); |
| 103 | } |