1 /*
2 * Copyright (c) 2004, 2006, 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
36 * if you are implementing <code>Icon</code> you'll invoke this from
37 * <code>paintIcon</code>.
38 * The args argument is useful when additional state is needed.
39 * <li>Override <code>paintToImage</code> to render the image. The code that
40 * lives here is equivalent to what previously would go in
41 * <code>paintIcon</code>, for an <code>Icon</code>.
42 * </ol>
43 * The two ways to use this class are:
44 * <ol>
45 * <li>Invoke <code>paint</code> to draw the cached reprensentation at
46 * the specified location.
47 * <li>Invoke <code>getImage</code> to get the cached reprensentation and
48 * draw the image yourself. This is primarly useful when you are not
49 * using <code>VolatileImage</code>.
50 * </ol>
51 *
52 *
53 */
54 public abstract class CachedPainter {
55 // CacheMap maps from class to ImageCache.
56 private static final Map<Object,ImageCache> cacheMap =
57 new HashMap<Object,ImageCache>();
58
59
60 private static ImageCache getCache(Object key) {
61 synchronized(CachedPainter.class) {
62 ImageCache cache = cacheMap.get(key);
63 if (cache == null) {
64 cache = new ImageCache(1);
65 cacheMap.put(key, cache);
66 }
67 return cache;
68 }
69 }
70
71 /**
72 * Creates an instance of <code>CachedPainter</code> that will cache up
73 * to <code>cacheCount</code> images of this class.
74 *
75 * @param cacheCount Max number of images to cache
76 */
77 public CachedPainter(int cacheCount) {
78 getCache(getClass()).setMaxCount(cacheCount);
79 }
80
81 /**
82 * Renders the cached image to the passed in <code>Graphic</code>.
83 * If there is no cached image <code>paintToImage</code> will be invoked.
84 * <code>paintImage</code> is invoked to paint the cached image.
85 *
86 * @param c Component rendering to, this may be null.
87 * @param g Graphics to paint to
88 * @param x X-coordinate to render to
89 * @param y Y-coordinate to render to
90 * @param w Width to render in
91 * @param h Height to render in
92 * @param args Variable arguments that will be passed to paintToImage
93 */
94 public void paint(Component c, Graphics g, int x,
95 int y, int w, int h, Object... args) {
96 if (w <= 0 || h <= 0) {
97 return;
98 }
99 if (c != null) {
100 synchronized(c.getTreeLock()) {
101 synchronized(CachedPainter.class) {
102 // If c is non-null, synchronize on the tree lock.
103 // This is necessary because asking for the
104 // GraphicsConfiguration will grab a tree lock.
105 paint0(c, g, x, y, w, h, args);
106 }
107 }
108 }
109 else {
110 synchronized(CachedPainter.class) {
111 paint0(c, g, x, y, w, h, args);
112 }
113 }
114 }
115
116 private void paint0(Component c, Graphics g, int x,
117 int y, int w, int h, Object... args) {
118 Object key = getClass();
119 GraphicsConfiguration config = getGraphicsConfiguration(c);
120 ImageCache cache = getCache(key);
121 Image image = cache.getImage(key, config, w, h, args);
122 int attempts = 0;
123 do {
124 boolean draw = false;
125 if (image instanceof VolatileImage) {
126 // See if we need to recreate the image
127 switch (((VolatileImage)image).validate(config)) {
128 case VolatileImage.IMAGE_INCOMPATIBLE:
129 ((VolatileImage)image).flush();
130 image = null;
131 break;
132 case VolatileImage.IMAGE_RESTORED:
133 draw = true;
134 break;
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1 /*
2 * Copyright (c) 2004, 2015, 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
36 * if you are implementing <code>Icon</code> you'll invoke this from
37 * <code>paintIcon</code>.
38 * The args argument is useful when additional state is needed.
39 * <li>Override <code>paintToImage</code> to render the image. The code that
40 * lives here is equivalent to what previously would go in
41 * <code>paintIcon</code>, for an <code>Icon</code>.
42 * </ol>
43 * The two ways to use this class are:
44 * <ol>
45 * <li>Invoke <code>paint</code> to draw the cached reprensentation at
46 * the specified location.
47 * <li>Invoke <code>getImage</code> to get the cached reprensentation and
48 * draw the image yourself. This is primarly useful when you are not
49 * using <code>VolatileImage</code>.
50 * </ol>
51 *
52 *
53 */
54 public abstract class CachedPainter {
55 // CacheMap maps from class to ImageCache.
56 private static final Map<Object,ImageCache> cacheMap = new HashMap<>();
57
58 private static ImageCache getCache(Object key) {
59 synchronized(CachedPainter.class) {
60 ImageCache cache = cacheMap.get(key);
61 if (cache == null) {
62 cache = new ImageCache(1);
63 cacheMap.put(key, cache);
64 }
65 return cache;
66 }
67 }
68
69 /**
70 * Creates an instance of <code>CachedPainter</code> that will cache up
71 * to <code>cacheCount</code> images of this class.
72 *
73 * @param cacheCount Max number of images to cache
74 */
75 public CachedPainter(int cacheCount) {
76 getCache(getClass()).setMaxCount(cacheCount);
77 }
78
79 /**
80 * Renders the cached image to the passed in <code>Graphic</code>.
81 * If there is no cached image <code>paintToImage</code> will be invoked.
82 * <code>paintImage</code> is invoked to paint the cached image.
83 *
84 * @param c Component rendering to, this may be null.
85 * @param g Graphics to paint to
86 * @param x X-coordinate to render to
87 * @param y Y-coordinate to render to
88 * @param w Width to render in
89 * @param h Height to render in
90 * @param args Variable arguments that will be passed to paintToImage
91 */
92 public void paint(Component c, Graphics g, int x,
93 int y, int w, int h, Object... args) {
94 if (w <= 0 || h <= 0) {
95 return;
96 }
97 synchronized (CachedPainter.class) {
98 paint0(c, g, x, y, w, h, args);
99 }
100 }
101
102 private void paint0(Component c, Graphics g, int x,
103 int y, int w, int h, Object... args) {
104 Object key = getClass();
105 GraphicsConfiguration config = getGraphicsConfiguration(c);
106 ImageCache cache = getCache(key);
107 Image image = cache.getImage(key, config, w, h, args);
108 int attempts = 0;
109 do {
110 boolean draw = false;
111 if (image instanceof VolatileImage) {
112 // See if we need to recreate the image
113 switch (((VolatileImage)image).validate(config)) {
114 case VolatileImage.IMAGE_INCOMPATIBLE:
115 ((VolatileImage)image).flush();
116 image = null;
117 break;
118 case VolatileImage.IMAGE_RESTORED:
119 draw = true;
120 break;
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