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| 1 | /* | ||
| 2 | * Copyright (c) 1997, 1999, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * 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 | } | ||