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