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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 | +} | |