1 /* 2 * Copyright (c) 1997, 2014, 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 @SuppressWarnings("serial") // JDK-implementation class 37 public abstract class CustomCursor extends Cursor { 38 39 protected Image image; 40 41 public CustomCursor(Image cursor, Point hotSpot, String name) 42 throws IndexOutOfBoundsException { 43 super(name); 44 image = cursor; 45 Toolkit toolkit = Toolkit.getDefaultToolkit(); 46 47 // Make sure image is fully loaded. 48 Component c = new Canvas(); // for its imageUpdate method 49 MediaTracker tracker = new MediaTracker(c); 50 tracker.addImage(cursor, 0); 51 try { 52 tracker.waitForAll(); 53 } catch (InterruptedException e) { 54 } 55 int width = cursor.getWidth(c); 56 int height = cursor.getHeight(c); 57 58 // Fix for bug 4212593 The Toolkit.createCustomCursor does not 59 // check absence of the image of cursor 60 // If the image is invalid, the cursor will be hidden (made completely 61 // transparent). In this case, getBestCursorSize() will adjust negative w and h, 62 // but we need to set the hotspot inside the image here. 63 if (tracker.isErrorAny() || width < 0 || height < 0) { 64 hotSpot.x = hotSpot.y = 0; 65 } 66 67 // Scale image to nearest supported size. 68 Dimension nativeSize = toolkit.getBestCursorSize(width, height); 69 if (nativeSize.width != width || nativeSize.height != height) { 70 cursor = cursor.getScaledInstance(nativeSize.width, 71 nativeSize.height, 72 Image.SCALE_DEFAULT); 73 width = nativeSize.width; 74 height = nativeSize.height; 75 } 76 77 // Verify that the hotspot is within cursor bounds. 78 if (hotSpot.x >= width || hotSpot.y >= height || hotSpot.x < 0 || hotSpot.y < 0) { 79 throw new IndexOutOfBoundsException("invalid hotSpot"); 80 } 81 82 /* Extract ARGB array from image. 83 * 84 * A transparency mask can be created in native code by checking 85 * each pixel's top byte -- a 0 value means the pixel's transparent. 86 * Since each platform's format of the bitmap and mask are likely to 87 * be different, their creation shouldn't be here. 88 */ 89 int[] pixels = new int[width * height]; 90 ImageProducer ip = cursor.getSource(); 91 PixelGrabber pg = new PixelGrabber(ip, 0, 0, width, height, 92 pixels, 0, width); 93 try { 94 pg.grabPixels(); 95 } catch (InterruptedException e) { 96 } 97 98 createNativeCursor(image, pixels, width, height, hotSpot.x, hotSpot.y); 99 } 100 101 protected abstract void createNativeCursor(Image im, int[] pixels, 102 int width, int height, 103 int xHotSpot, int yHotSpot); 104 }