1 /*
2 * Copyright (c) 2011, 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.lwawt.macosx;
27
28 import java.awt.*;
29 import java.awt.image.BufferedImage;
30
31 @SuppressWarnings("serial") // JDK implementation class
32 public class CCustomCursor extends Cursor {
33 static Dimension sMaxCursorSize;
34 static Dimension getMaxCursorSize() {
35 if (sMaxCursorSize != null) return sMaxCursorSize;
36 final Rectangle bounds = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration().getBounds();
37 return sMaxCursorSize = new Dimension(bounds.width / 2, bounds.height / 2);
38 }
39
40 Image fImage;
41 Point fHotspot;
42 int fWidth;
43 int fHeight;
44
45 public CCustomCursor(final Image cursor, final Point hotSpot, final String name) throws IndexOutOfBoundsException, HeadlessException {
46 super(name);
47 fImage = cursor;
48 fHotspot = hotSpot;
49
50 // This chunk of code is copied from sun.awt.CustomCursor
51 final Toolkit toolkit = Toolkit.getDefaultToolkit();
52
53 // Make sure image is fully loaded.
54 final Component c = new Canvas(); // for its imageUpdate method
55 final MediaTracker tracker = new MediaTracker(c);
56 // MediaTracker loads resolution variants from MultiResolution Toolkit image
57 tracker.addImage(fImage, 0);
58 try {
59 tracker.waitForAll();
60 } catch (final InterruptedException e) {}
61
62 int width = fImage.getWidth(c);
63 int height = fImage.getHeight(c);
64
65 // Fix for bug 4212593 The Toolkit.createCustomCursor does not
66 // check absence of the image of cursor
67 // If the image is invalid, the cursor will be hidden (made completely
68 // transparent).
69 if (tracker.isErrorAny() || width < 0 || height < 0) {
70 fHotspot.x = fHotspot.y = 0;
71 width = height = 1;
72 fImage = createTransparentImage(width, height);
73 } else {
74 // Get the nearest supported cursor size
75 final Dimension nativeSize = toolkit.getBestCursorSize(width, height);
76 width = nativeSize.width;
77 height = nativeSize.height;
78 }
79
80 fWidth = width;
81 fHeight = height;
82
83 // NOTE: this was removed for 3169146, but in 1.5 the JCK tests for an exception and fails if one isn't thrown.
84 // See what JBuilder does.
85 // Verify that the hotspot is within cursor bounds.
86 if (fHotspot.x >= width || fHotspot.y >= height || fHotspot.x < 0 || fHotspot.y < 0) {
87 throw new IndexOutOfBoundsException("invalid hotSpot");
88 }
89
90 // Must normalize the hotspot
91 if (fHotspot.x >= width) {
92 fHotspot.x = width - 1; // it is zero based.
93 } else if (fHotspot.x < 0) {
94 fHotspot.x = 0;
95 }
96 if (fHotspot.y >= height) {
97 fHotspot.y = height - 1; // it is zero based.
98 } else if (fHotspot.y < 0) {
99 fHotspot.y = 0;
100 }
101 }
102
103 private static BufferedImage createTransparentImage(int w, int h) {
104 GraphicsEnvironment ge =
105 GraphicsEnvironment.getLocalGraphicsEnvironment();
106 GraphicsDevice gs = ge.getDefaultScreenDevice();
107 GraphicsConfiguration gc = gs.getDefaultConfiguration();
108
109 BufferedImage img = gc.createCompatibleImage(w, h, Transparency.BITMASK);
110 Graphics2D g = (Graphics2D)img.getGraphics();
111 g.setBackground(new Color(0, 0, 0, 0));
112 g.clearRect(0, 0, w, h);
113 g.dispose();
114
115 return img;
116 }
117
118 public static Dimension getBestCursorSize(final int preferredWidth, final int preferredHeight) {
119 // With Panther, cursors have no limit on their size. So give the client their
120 // preferred size, but no larger than half the dimensions of the main screen
121 // This will allow large cursors, but not cursors so large that they cover the
122 // screen. Since solaris nor windows allow cursors this big, this shouldn't be
123 // a limitation.
124 // JCK triggers an overflow in the int -- if we get a bizarre value normalize it.
125 final Dimension maxCursorSize = getMaxCursorSize();
126 final Dimension d = new Dimension(Math.max(1, Math.abs(preferredWidth)), Math.max(1, Math.abs(preferredHeight)));
127 return new Dimension(Math.min(d.width, maxCursorSize.width), Math.min(d.height, maxCursorSize.height));
128 }
129
130 // Called from native when the cursor is set
131 CImage fCImage;
132 long getImageData() {
133 if (fCImage != null) {
134 return fCImage.ptr;
135 }
136
137 try {
138 fCImage = CImage.getCreator().createFromImage(fImage);
139 if (fCImage == null) {
140 // Something unexpected happened: CCustomCursor constructor
141 // takes care of invalid cursor images, yet createFromImage()
142 // failed to do its job. Return null to keep the cursor unchanged.
143 return 0L;
144 } else {
145 fCImage.resizeRepresentations(fWidth, fHeight);
146 return fCImage.ptr;
147 }
148 } catch (IllegalArgumentException iae) {
149 // see comment above
150 return 0L;
151 }
152 }
153
154 Point getHotSpot() {
155 return fHotspot;
156 }
157 }