1 /*
2 * Portions Copyright 1998 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 /* ********************************************************************
27 **********************************************************************
28 **********************************************************************
29 *** COPYRIGHT (c) Eastman Kodak Company, 1997 ***
30 *** As an unpublished work pursuant to Title 17 of the United ***
31 *** States Code. All rights reserved. ***
32 **********************************************************************
33 **********************************************************************
34 **********************************************************************/
35
36 package java.awt.image.renderable;
37 import java.awt.color.ColorSpace;
38 import java.awt.image.ColorModel;
39 import java.awt.image.DataBuffer;
40 import java.awt.image.DirectColorModel;
41 import java.awt.image.ImageConsumer;
42 import java.awt.image.ImageProducer;
43 import java.awt.image.Raster;
44 import java.awt.image.RenderedImage;
45 import java.awt.image.SampleModel;
46 import java.util.Enumeration;
47 import java.util.Vector;
48
49 /**
50 * An adapter class that implements ImageProducer to allow the
51 * asynchronous production of a RenderableImage. The size of the
52 * ImageConsumer is determined by the scale factor of the usr2dev
53 * transform in the RenderContext. If the RenderContext is null, the
54 * default rendering of the RenderableImage is used. This class
55 * implements an asynchronous production that produces the image in
56 * one thread at one resolution. This class may be subclassed to
57 * implement versions that will render the image using several
58 * threads. These threads could render either the same image at
59 * progressively better quality, or different sections of the image at
60 * a single resolution.
61 */
62 public class RenderableImageProducer implements ImageProducer, Runnable {
63
64 /** The RenderableImage source for the producer. */
65 RenderableImage rdblImage;
66
67 /** The RenderContext to use for producing the image. */
68 RenderContext rc;
69
70 /** A Vector of image consumers. */
71 Vector ics = new Vector();
72
73 /**
74 * Constructs a new RenderableImageProducer from a RenderableImage
75 * and a RenderContext.
76 *
77 * @param rdblImage the RenderableImage to be rendered.
78 * @param rc the RenderContext to use for producing the pixels.
79 */
80 public RenderableImageProducer(RenderableImage rdblImage,
81 RenderContext rc) {
82 this.rdblImage = rdblImage;
83 this.rc = rc;
84 }
85
86 /**
87 * Sets a new RenderContext to use for the next startProduction() call.
88 *
89 * @param rc the new RenderContext.
90 */
91 public synchronized void setRenderContext(RenderContext rc) {
92 this.rc = rc;
93 }
94
95 /**
96 * Adds an ImageConsumer to the list of consumers interested in
97 * data for this image.
98 *
99 * @param ic an ImageConsumer to be added to the interest list.
100 */
101 public synchronized void addConsumer(ImageConsumer ic) {
102 if (!ics.contains(ic)) {
103 ics.addElement(ic);
104 }
105 }
106
107 /**
108 * Determine if an ImageConsumer is on the list of consumers
109 * currently interested in data for this image.
110 *
111 * @param ic the ImageConsumer to be checked.
112 * @return true if the ImageConsumer is on the list; false otherwise.
113 */
114 public synchronized boolean isConsumer(ImageConsumer ic) {
115 return ics.contains(ic);
116 }
117
118 /**
119 * Remove an ImageConsumer from the list of consumers interested in
120 * data for this image.
121 *
122 * @param ic the ImageConsumer to be removed.
123 */
124 public synchronized void removeConsumer(ImageConsumer ic) {
125 ics.removeElement(ic);
126 }
127
128 /**
129 * Adds an ImageConsumer to the list of consumers interested in
130 * data for this image, and immediately starts delivery of the
131 * image data through the ImageConsumer interface.
132 *
133 * @param ic the ImageConsumer to be added to the list of consumers.
134 */
135 public synchronized void startProduction(ImageConsumer ic) {
136 addConsumer(ic);
137 // Need to build a runnable object for the Thread.
138 Thread thread = new Thread(this, "RenderableImageProducer Thread");
139 thread.start();
140 }
141
142 /**
143 * Requests that a given ImageConsumer have the image data delivered
144 * one more time in top-down, left-right order.
145 *
146 * @param ic the ImageConsumer requesting the resend.
147 */
148 public void requestTopDownLeftRightResend(ImageConsumer ic) {
149 // So far, all pixels are already sent in TDLR order
150 }
151
152 /**
153 * The runnable method for this class. This will produce an image using
154 * the current RenderableImage and RenderContext and send it to all the
155 * ImageConsumer currently registered with this class.
156 */
157 public void run() {
158 // First get the rendered image
159 RenderedImage rdrdImage;
160 if (rc != null) {
161 rdrdImage = rdblImage.createRendering(rc);
162 } else {
163 rdrdImage = rdblImage.createDefaultRendering();
164 }
165
166 // And its ColorModel
167 ColorModel colorModel = rdrdImage.getColorModel();
168 Raster raster = rdrdImage.getData();
169 SampleModel sampleModel = raster.getSampleModel();
170 DataBuffer dataBuffer = raster.getDataBuffer();
171
172 if (colorModel == null) {
173 colorModel = ColorModel.getRGBdefault();
174 }
175 int minX = raster.getMinX();
176 int minY = raster.getMinY();
177 int width = raster.getWidth();
178 int height = raster.getHeight();
179
180 Enumeration icList;
181 ImageConsumer ic;
182 // Set up the ImageConsumers
183 icList = ics.elements();
184 while (icList.hasMoreElements()) {
185 ic = (ImageConsumer)icList.nextElement();
186 ic.setDimensions(width,height);
187 ic.setHints(ImageConsumer.TOPDOWNLEFTRIGHT |
188 ImageConsumer.COMPLETESCANLINES |
189 ImageConsumer.SINGLEPASS |
190 ImageConsumer.SINGLEFRAME);
191 }
192
193 // Get RGB pixels from the raster scanline by scanline and
194 // send to consumers.
195 int pix[] = new int[width];
196 int i,j;
197 int numBands = sampleModel.getNumBands();
198 int tmpPixel[] = new int[numBands];
199 for (j = 0; j < height; j++) {
200 for(i = 0; i < width; i++) {
201 sampleModel.getPixel(i, j, tmpPixel, dataBuffer);
202 pix[i] = colorModel.getDataElement(tmpPixel, 0);
203 }
204 // Now send the scanline to the Consumers
205 icList = ics.elements();
206 while (icList.hasMoreElements()) {
207 ic = (ImageConsumer)icList.nextElement();
208 ic.setPixels(0, j, width, 1, colorModel, pix, 0, width);
209 }
210 }
211
212 // Now tell the consumers we're done.
213 icList = ics.elements();
214 while (icList.hasMoreElements()) {
215 ic = (ImageConsumer)icList.nextElement();
216 ic.imageComplete(ImageConsumer.STATICIMAGEDONE);
217 }
218 }
219 }
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