J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2003 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.awt.image; |
| 27 | |
| 28 | import java.util.Hashtable; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.IOException; |
| 31 | import java.awt.image.*; |
| 32 | |
| 33 | public abstract class ImageDecoder { |
| 34 | InputStreamImageSource source; |
| 35 | InputStream input; |
| 36 | Thread feeder; |
| 37 | |
| 38 | protected boolean aborted; |
| 39 | protected boolean finished; |
| 40 | ImageConsumerQueue queue; |
| 41 | ImageDecoder next; |
| 42 | |
| 43 | public ImageDecoder(InputStreamImageSource src, InputStream is) { |
| 44 | source = src; |
| 45 | input = is; |
| 46 | feeder = Thread.currentThread(); |
| 47 | } |
| 48 | |
| 49 | public boolean isConsumer(ImageConsumer ic) { |
| 50 | return ImageConsumerQueue.isConsumer(queue, ic); |
| 51 | } |
| 52 | |
| 53 | public void removeConsumer(ImageConsumer ic) { |
| 54 | queue = ImageConsumerQueue.removeConsumer(queue, ic, false); |
| 55 | if (!finished && queue == null) { |
| 56 | abort(); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | protected ImageConsumerQueue nextConsumer(ImageConsumerQueue cq) { |
| 61 | synchronized (source) { |
| 62 | if (aborted) { |
| 63 | return null; |
| 64 | } |
| 65 | cq = ((cq == null) ? queue : cq.next); |
| 66 | while (cq != null) { |
| 67 | if (cq.interested) { |
| 68 | return cq; |
| 69 | } |
| 70 | cq = cq.next; |
| 71 | } |
| 72 | } |
| 73 | return null; |
| 74 | } |
| 75 | |
| 76 | protected int setDimensions(int w, int h) { |
| 77 | ImageConsumerQueue cq = null; |
| 78 | int count = 0; |
| 79 | while ((cq = nextConsumer(cq)) != null) { |
| 80 | cq.consumer.setDimensions(w, h); |
| 81 | count++; |
| 82 | } |
| 83 | return count; |
| 84 | } |
| 85 | |
| 86 | protected int setProperties(Hashtable props) { |
| 87 | ImageConsumerQueue cq = null; |
| 88 | int count = 0; |
| 89 | while ((cq = nextConsumer(cq)) != null) { |
| 90 | cq.consumer.setProperties(props); |
| 91 | count++; |
| 92 | } |
| 93 | return count; |
| 94 | } |
| 95 | |
| 96 | protected int setColorModel(ColorModel model) { |
| 97 | ImageConsumerQueue cq = null; |
| 98 | int count = 0; |
| 99 | while ((cq = nextConsumer(cq)) != null) { |
| 100 | cq.consumer.setColorModel(model); |
| 101 | count++; |
| 102 | } |
| 103 | return count; |
| 104 | } |
| 105 | |
| 106 | protected int setHints(int hints) { |
| 107 | ImageConsumerQueue cq = null; |
| 108 | int count = 0; |
| 109 | while ((cq = nextConsumer(cq)) != null) { |
| 110 | cq.consumer.setHints(hints); |
| 111 | count++; |
| 112 | } |
| 113 | return count; |
| 114 | } |
| 115 | |
| 116 | protected void headerComplete() { |
| 117 | feeder.setPriority(ImageFetcher.LOW_PRIORITY); |
| 118 | } |
| 119 | |
| 120 | protected int setPixels(int x, int y, int w, int h, ColorModel model, |
| 121 | byte pix[], int off, int scansize) { |
| 122 | source.latchConsumers(this); |
| 123 | ImageConsumerQueue cq = null; |
| 124 | int count = 0; |
| 125 | while ((cq = nextConsumer(cq)) != null) { |
| 126 | cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize); |
| 127 | count++; |
| 128 | } |
| 129 | return count; |
| 130 | } |
| 131 | |
| 132 | protected int setPixels(int x, int y, int w, int h, ColorModel model, |
| 133 | int pix[], int off, int scansize) { |
| 134 | source.latchConsumers(this); |
| 135 | ImageConsumerQueue cq = null; |
| 136 | int count = 0; |
| 137 | while ((cq = nextConsumer(cq)) != null) { |
| 138 | cq.consumer.setPixels(x, y, w, h, model, pix, off, scansize); |
| 139 | count++; |
| 140 | } |
| 141 | return count; |
| 142 | } |
| 143 | |
| 144 | protected int imageComplete(int status, boolean done) { |
| 145 | source.latchConsumers(this); |
| 146 | if (done) { |
| 147 | finished = true; |
| 148 | source.doneDecoding(this); |
| 149 | } |
| 150 | ImageConsumerQueue cq = null; |
| 151 | int count = 0; |
| 152 | while ((cq = nextConsumer(cq)) != null) { |
| 153 | cq.consumer.imageComplete(status); |
| 154 | count++; |
| 155 | } |
| 156 | return count; |
| 157 | } |
| 158 | |
| 159 | public abstract void produceImage() throws IOException, |
| 160 | ImageFormatException; |
| 161 | |
| 162 | public void abort() { |
| 163 | aborted = true; |
| 164 | source.doneDecoding(this); |
| 165 | close(); |
| 166 | java.security.AccessController.doPrivileged( |
| 167 | new java.security.PrivilegedAction() { |
| 168 | public Object run() { |
| 169 | feeder.interrupt(); |
| 170 | return null; |
| 171 | } |
| 172 | }); |
| 173 | } |
| 174 | |
| 175 | public synchronized void close() { |
| 176 | if (input != null) { |
| 177 | try { |
| 178 | input.close(); |
| 179 | } catch (IOException e) { |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | } |