1 /*
2 * Copyright (c) 2011, 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
30 public class CCustomCursor extends Cursor {
31 static Dimension sMaxCursorSize;
32 static Dimension getMaxCursorSize() {
33 if (sMaxCursorSize != null) return sMaxCursorSize;
34 final Rectangle bounds = GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration().getBounds();
35 return sMaxCursorSize = new Dimension(bounds.width / 2, bounds.height / 2);
36 }
37
38 Image fImage;
39 private boolean isImageOk = false;
40 Point fHotspot;
41
42 public CCustomCursor(final Image cursor, final Point hotSpot, final String name) throws IndexOutOfBoundsException, HeadlessException {
43 super(name);
44 fImage = cursor;
45 fHotspot = hotSpot;
46
47 // This chunk of code is copied from sun.awt.CustomCursor
48 final Toolkit toolkit = Toolkit.getDefaultToolkit();
49
50 // Make sure image is fully loaded.
51 final Component c = new Canvas(); // for its imageUpdate method
52 final MediaTracker tracker = new MediaTracker(c);
53 tracker.addImage(fImage, 0);
54 try {
55 tracker.waitForAll();
56 } catch (final InterruptedException e) {}
57
58 int width = fImage.getWidth(c);
59 int height = fImage.getHeight(c);
60
61 // Fix for bug 4212593 The Toolkit.createCustomCursor does not
62 // check absence of the image of cursor
63 // If the image is invalid, the cursor will be hidden (made completely
64 // transparent). In this case, getBestCursorSize() will adjust negative w and h,
65 // but we need to set the hotspot inside the image here.
66 if (tracker.isErrorAny() || width < 0 || height < 0) {
67 fHotspot.x = fHotspot.y = 0;
68 isImageOk = false;
69 } else {
70 isImageOk = true;
71 }
72
73 // Scale image to nearest supported size
74 final Dimension nativeSize = toolkit.getBestCursorSize(width, height);
75 if (nativeSize.width != width || nativeSize.height != height) {
76 fImage = fImage.getScaledInstance(nativeSize.width, nativeSize.height, Image.SCALE_DEFAULT);
77 width = nativeSize.width;
78 height = nativeSize.height;
79 }
80
81 // NOTE: this was removed for 3169146, but in 1.5 the JCK tests for an exception and fails if one isn't thrown.
82 // See what JBuilder does.
83 // Verify that the hotspot is within cursor bounds.
84 if (fHotspot.x >= width || fHotspot.y >= height || fHotspot.x < 0 || fHotspot.y < 0) {
85 throw new IndexOutOfBoundsException("invalid hotSpot");
86 }
87
88 // Must normalize the hotspot
89 if (fHotspot.x >= width) {
90 fHotspot.x = width - 1; // it is zero based.
91 } else if (fHotspot.x < 0) {
92 fHotspot.x = 0;
93 }
94 if (fHotspot.y >= height) {
95 fHotspot.y = height - 1; // it is zero based.
96 } else if (fHotspot.y < 0) {
97 fHotspot.y = 0;
98 }
99 }
100
101 public static Dimension getBestCursorSize(final int preferredWidth, final int preferredHeight) {
102 // With Panther, cursors have no limit on their size. So give the client their
103 // preferred size, but no larger than half the dimensions of the main screen
104 // This will allow large cursors, but not cursors so large that they cover the
105 // screen. Since solaris nor windows allow cursors this big, this shouldn't be
106 // a limitation.
107 // JCK triggers an overflow in the int -- if we get a bizarre value normalize it.
108 final Dimension maxCursorSize = getMaxCursorSize();
109 final Dimension d = new Dimension(Math.max(1, Math.abs(preferredWidth)), Math.max(1, Math.abs(preferredHeight)));
110 return new Dimension(Math.min(d.width, maxCursorSize.width), Math.min(d.height, maxCursorSize.height));
111 }
112
113 // Called from native when the cursor is set
114 // Returns long array of [NSImage ptr, x hotspot, y hotspot]
115 CImage fCImage;
116 long getImageData() {
117 if (fCImage != null) {
118 return fCImage.ptr;
119 }
120
121 if (isImageOk) {
122 try {
123 fCImage = CImage.getCreator().createFromImage(fImage);
124
125 if (fCImage == null) {
126 isImageOk = false;
127 return 0L;
128 } else {
129 return fCImage.ptr;
130 }
131 } catch (IllegalArgumentException iae) {
132 // Silently return null - we want to hide cursor by providing an empty
133 // ByteArray or just null
134 return 0L;
135 }
136 }
137
138 return 0L;
139 }
140
141 Point getHotSpot() {
142 return fHotspot;
143 }
144 }