Source Code Cross Referenced for ImageReader.java in  » Content-Management-System » apache-lenya-2.0 » org » apache » cocoon » reading » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Content Management System » apache lenya 2.0 » org.apache.cocoon.reading 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *      http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         */
017:        package org.apache.cocoon.reading;
018:
019:        import java.awt.color.ColorSpace;
020:        import java.awt.geom.AffineTransform;
021:        import java.awt.image.AffineTransformOp;
022:        import java.awt.image.BufferedImage;
023:        import java.awt.image.ColorConvertOp;
024:        import java.awt.image.RescaleOp;
025:        import java.awt.image.WritableRaster;
026:        import java.io.ByteArrayOutputStream;
027:        import java.io.IOException;
028:        import java.io.InputStream;
029:        import java.io.Serializable;
030:        import java.util.Map;
031:        import javax.swing.ImageIcon;
032:
033:        import org.apache.avalon.framework.parameters.Parameters;
034:        import org.apache.cocoon.ProcessingException;
035:        import org.apache.cocoon.environment.SourceResolver;
036:        import org.apache.commons.lang.SystemUtils;
037:        import org.xml.sax.SAXException;
038:
039:        import com.sun.image.codec.jpeg.ImageFormatException;
040:        import com.sun.image.codec.jpeg.JPEGCodec;
041:        import com.sun.image.codec.jpeg.JPEGEncodeParam;
042:        import com.sun.image.codec.jpeg.JPEGImageEncoder;
043:
044:        /**
045:         * The <code>ImageReader</code> component is used to serve binary image data
046:         * in a sitemap pipeline. It makes use of HTTP Headers to determine if
047:         * the requested resource should be written to the <code>OutputStream</code>
048:         * or if it can signal that it hasn't changed.
049:         *
050:         * Parameters:
051:         *   <dl>
052:         *     <dt>&lt;width&gt;</dt>
053:         *     <dd> This parameter is optional. When specified, it determines the
054:         *          width of the binary image.
055:         *          If no height parameter is specified, the aspect ratio
056:         *          of the image is kept. The parameter may be expressed as an int or a percentage.
057:         *     </dd>
058:         *     <dt>&lt;height&gt;</dt>
059:         *     <dd> This parameter is optional. When specified, it determines the
060:         *          height of the binary image.
061:         *          If no width parameter is specified, the aspect ratio
062:         *          of the image is kept. The parameter may be expressed as an int or a percentage.
063:         *     </dd>
064:         *     <dt>&lt;scale(Red|Green|Blue)&gt;</dt>
065:         *     <dd>This parameter is optional. When specified it will cause the
066:         *         specified color component in the image to be multiplied by the
067:         *         specified floating point value.
068:         *     </dd>
069:         *     <dt>&lt;offset(Red|Green|Blue)&gt;</dt>
070:         *     <dd>This parameter is optional. When specified it will cause the
071:         *         specified color component in the image to be incremented by the
072:         *         specified floating point value.
073:         *     </dd>
074:         *     <dt>&lt;grayscale&gt;</dt>
075:         *     <dd>This parameter is optional. When specified and set to true it
076:         *         will cause each image pixel to be normalized. Default is "false".
077:         *     </dd>
078:         *     <dt>&lt;allow-enlarging&gt;</dt>
079:         *     <dd>This parameter is optional. By default, if the image is smaller
080:         *         than the specified width and height, the image will be enlarged.
081:         *         In some circumstances this behaviour is undesirable, and can be
082:         *         switched off by setting this parameter to "<code>false</code>" so that
083:         *         images will be reduced in size, but not enlarged. The default is
084:         *         "<code>true</code>".
085:         *     </dd>
086:         *     <dt>&lt;quality&gt;</dt>
087:         *     <dd>This parameter is optional. By default, the quality uses the
088:         *         default for the JVM. If it is specified, the proper JPEG quality
089:         *         compression is used. The range is 0.0 to 1.0, if specified.
090:         *     </dd>
091:         *   </dl>
092:         *
093:         * @version $Id: ImageReader.java 433543 2006-08-22 06:22:54Z crossley $
094:         */
095:        final public class ImageReader extends ResourceReader {
096:            private static final boolean GRAYSCALE_DEFAULT = false;
097:            private static final boolean ENLARGE_DEFAULT = true;
098:            private static final boolean FIT_DEFAULT = false;
099:
100:            /* See http://developer.java.sun.com/developer/bugParade/bugs/4502892.html */
101:            private static final boolean JVMBugFixed = SystemUtils
102:                    .isJavaVersionAtLeast(1.4f);
103:
104:            private int width;
105:            private int height;
106:            private float[] scaleColor = new float[3];
107:            private float[] offsetColor = new float[3];
108:            private float[] quality = new float[1];
109:
110:            private boolean enlarge;
111:            private boolean fitUniform;
112:            private boolean usePercent;
113:            private RescaleOp colorFilter;
114:            private ColorConvertOp grayscaleFilter;
115:
116:            public void setup(SourceResolver resolver, Map objectModel,
117:                    String src, Parameters par) throws ProcessingException,
118:                    SAXException, IOException {
119:
120:                char lastChar;
121:                String tmpWidth = par.getParameter("width", "0");
122:                String tmpHeight = par.getParameter("height", "0");
123:
124:                this .scaleColor[0] = par.getParameterAsFloat("scaleRed", -1.0f);
125:                this .scaleColor[1] = par.getParameterAsFloat("scaleGreen",
126:                        -1.0f);
127:                this .scaleColor[2] = par
128:                        .getParameterAsFloat("scaleBlue", -1.0f);
129:                this .offsetColor[0] = par
130:                        .getParameterAsFloat("offsetRed", 0.0f);
131:                this .offsetColor[1] = par.getParameterAsFloat("offsetGreen",
132:                        0.0f);
133:                this .offsetColor[2] = par.getParameterAsFloat("offsetBlue",
134:                        0.0f);
135:                this .quality[0] = par.getParameterAsFloat("quality", 0.9f);
136:
137:                boolean filterColor = false;
138:                for (int i = 0; i < 3; ++i) {
139:                    if (this .scaleColor[i] != -1.0f) {
140:                        filterColor = true;
141:                    } else {
142:                        this .scaleColor[i] = 1.0f;
143:                    }
144:                    if (this .offsetColor[i] != 0.0f) {
145:                        filterColor = true;
146:                    }
147:                }
148:
149:                if (filterColor) {
150:                    this .colorFilter = new RescaleOp(scaleColor, offsetColor,
151:                            null);
152:                }
153:
154:                usePercent = false;
155:                lastChar = tmpWidth.charAt(tmpWidth.length() - 1);
156:                if (lastChar == '%') {
157:                    usePercent = true;
158:                    width = Integer.parseInt(tmpWidth.substring(0, tmpWidth
159:                            .length() - 1));
160:                } else {
161:                    width = Integer.parseInt(tmpWidth);
162:                }
163:
164:                lastChar = tmpHeight.charAt(tmpHeight.length() - 1);
165:                if (lastChar == '%') {
166:                    usePercent = true;
167:                    height = Integer.parseInt(tmpHeight.substring(0, tmpHeight
168:                            .length() - 1));
169:                } else {
170:                    height = Integer.parseInt(tmpHeight);
171:                }
172:
173:                if (par.getParameterAsBoolean("grayscale", GRAYSCALE_DEFAULT)) {
174:                    this .grayscaleFilter = new ColorConvertOp(ColorSpace
175:                            .getInstance(ColorSpace.CS_GRAY), null);
176:                }
177:
178:                this .enlarge = par.getParameterAsBoolean("allow-enlarging",
179:                        ENLARGE_DEFAULT);
180:                this .fitUniform = par.getParameterAsBoolean("fit-uniform",
181:                        FIT_DEFAULT);
182:
183:                super .setup(resolver, objectModel, src, par);
184:            }
185:
186:            protected void setupHeaders() {
187:                // Reset byte ranges support for dynamic response
188:                if (byteRanges && hasTransform()) {
189:                    byteRanges = false;
190:                }
191:
192:                super .setupHeaders();
193:            }
194:
195:            /**
196:             * @return True if image transform is specified
197:             */
198:            private boolean hasTransform() {
199:                return width > 0 || height > 0 || null != colorFilter
200:                        || null != grayscaleFilter || (this .quality[0] != 0.9f);
201:            }
202:
203:            /**
204:             * Returns the affine transform that implements the scaling.
205:             * The behavior is the following: if both the new width and height values
206:             * are positive, the image is rescaled according to these new values and
207:             * the original aspect ratio is lost.
208:             * Otherwise, if one of the two parameters is zero or negative, the
209:             * aspect ratio is maintained and the positive parameter indicates the
210:             * scaling.
211:             * If both new values are zero or negative, no scaling takes place (a unit
212:             * transformation is applied).
213:             */
214:            private AffineTransform getTransform(double ow, double oh,
215:                    double nw, double nh) {
216:                double wm = 1.0d;
217:                double hm = 1.0d;
218:
219:                if (fitUniform) {
220:                    //
221:                    // Compare aspect ratio of image vs. that of the "box"
222:                    // defined by nw and nh
223:                    //
224:                    if (ow / oh > nw / nh) {
225:                        nh = 0; // Original image is proportionately wider than the box,
226:                        // so scale to fit width
227:                    } else {
228:                        nw = 0; // Scale to fit height
229:                    }
230:                }
231:
232:                if (nw > 0) {
233:                    wm = nw / ow;
234:                    if (nh > 0) {
235:                        hm = nh / oh;
236:                    } else {
237:                        hm = wm;
238:                    }
239:                } else {
240:                    if (nh > 0) {
241:                        hm = nh / oh;
242:                        wm = hm;
243:                    }
244:                }
245:
246:                if (!enlarge) {
247:                    if ((nw > ow && nh <= 0) || (nh > oh && nw <= 0)) {
248:                        wm = 1.0d;
249:                        hm = 1.0d;
250:                    } else if (nw > ow) {
251:                        wm = 1.0d;
252:                    } else if (nh > oh) {
253:                        hm = 1.0d;
254:                    }
255:                }
256:                return new AffineTransform(wm, 0.0d, 0.0d, hm, 0.0d, 0.0d);
257:            }
258:
259:            protected byte[] readFully(InputStream in) throws IOException {
260:                byte tmpbuffer[] = new byte[4096];
261:                ByteArrayOutputStream baos = new ByteArrayOutputStream();
262:                int i;
263:                while (-1 != (i = in.read(tmpbuffer))) {
264:                    baos.write(tmpbuffer, 0, i);
265:                }
266:                baos.flush();
267:                return baos.toByteArray();
268:            }
269:
270:            protected void processStream(InputStream inputStream)
271:                    throws IOException, ProcessingException {
272:                if (hasTransform()) {
273:                    if (getLogger().isDebugEnabled()) {
274:                        getLogger().debug(
275:                                "image "
276:                                        + ((width == 0) ? "?" : Integer
277:                                                .toString(width))
278:                                        + "x"
279:                                        + ((height == 0) ? "?" : Integer
280:                                                .toString(height))
281:                                        + " expires: " + expires);
282:                    }
283:
284:                    /*
285:                     * NOTE (SM):
286:                     * Due to Bug Id 4502892 (which is found in *all* JVM implementations from
287:                     * 1.2.x and 1.3.x on all OS!), we must buffer the JPEG generation to avoid
288:                     * that connection resetting by the peer (user pressing the stop button,
289:                     * for example) crashes the entire JVM (yes, dude, the bug is *that* nasty
290:                     * since it happens in JPEG routines which are native!)
291:                     * I'm perfectly aware of the huge memory problems that this causes (almost
292:                     * doubling memory consumption for each image and making the GC work twice
293:                     * as hard) but it's *far* better than restarting the JVM every 2 minutes
294:                     * (since this is the average experience for image-intensive web application
295:                     * such as an image gallery).
296:                     * Please, go to the <a href="http://developer.java.sun.com/developer/bugParade/bugs/4502892.html">Sun Developers Connection</a>
297:                     * and vote this BUG as the one you would like fixed sooner rather than
298:                     * later and all this hack will automagically go away.
299:                     * Many deep thanks to Michael Hartle <mhartle@hartle-klug.com> for tracking
300:                     * this down and suggesting the workaround.
301:                     *
302:                     * UPDATE (SM):
303:                     * This appears to be fixed on JDK 1.4
304:                     */
305:
306:                    try {
307:                        byte content[] = readFully(inputStream);
308:                        ImageIcon icon = new ImageIcon(content);
309:                        BufferedImage original = new BufferedImage(icon
310:                                .getIconWidth(), icon.getIconHeight(),
311:                                BufferedImage.TYPE_INT_RGB);
312:                        BufferedImage currentImage = original;
313:                        currentImage.getGraphics().drawImage(icon.getImage(),
314:                                0, 0, null);
315:
316:                        if (width > 0 || height > 0) {
317:                            double ow = icon.getImage().getWidth(null);
318:                            double oh = icon.getImage().getHeight(null);
319:
320:                            if (usePercent) {
321:                                if (width > 0) {
322:                                    width = Math
323:                                            .round((int) (ow * width) / 100);
324:                                }
325:                                if (height > 0) {
326:                                    height = Math
327:                                            .round((int) (oh * height) / 100);
328:                                }
329:                            }
330:
331:                            AffineTransformOp filter = new AffineTransformOp(
332:                                    getTransform(ow, oh, width, height),
333:                                    AffineTransformOp.TYPE_BILINEAR);
334:                            WritableRaster scaledRaster = filter
335:                                    .createCompatibleDestRaster(currentImage
336:                                            .getRaster());
337:
338:                            filter.filter(currentImage.getRaster(),
339:                                    scaledRaster);
340:
341:                            currentImage = new BufferedImage(original
342:                                    .getColorModel(), scaledRaster, true, null);
343:                        }
344:
345:                        if (null != grayscaleFilter) {
346:                            grayscaleFilter.filter(currentImage, currentImage);
347:                        }
348:
349:                        if (null != colorFilter) {
350:                            colorFilter.filter(currentImage, currentImage);
351:                        }
352:
353:                        // JVM Bug handling
354:                        if (JVMBugFixed) {
355:                            JPEGImageEncoder encoder = JPEGCodec
356:                                    .createJPEGEncoder(out);
357:                            JPEGEncodeParam p = encoder
358:                                    .getDefaultJPEGEncodeParam(currentImage);
359:                            p.setQuality(this .quality[0], true);
360:                            encoder.setJPEGEncodeParam(p);
361:                            encoder.encode(currentImage);
362:                        } else {
363:                            ByteArrayOutputStream bstream = new ByteArrayOutputStream();
364:                            JPEGImageEncoder encoder = JPEGCodec
365:                                    .createJPEGEncoder(bstream);
366:                            JPEGEncodeParam p = encoder
367:                                    .getDefaultJPEGEncodeParam(currentImage);
368:                            p.setQuality(this .quality[0], true);
369:                            encoder.setJPEGEncodeParam(p);
370:                            encoder.encode(currentImage);
371:                            out.write(bstream.toByteArray());
372:                        }
373:
374:                        out.flush();
375:                    } catch (ImageFormatException e) {
376:                        throw new ProcessingException(
377:                                "Error reading the image. "
378:                                        + "Note that only JPEG images are currently supported.");
379:                    } finally {
380:                        // Bugzilla Bug 25069, close inputStream in finally block
381:                        // this will close inputStream even if processStream throws
382:                        // an exception
383:                        inputStream.close();
384:                    }
385:                } else {
386:                    // only read the resource - no modifications requested
387:                    if (getLogger().isDebugEnabled()) {
388:                        getLogger().debug("passing original resource");
389:                    }
390:                    super .processStream(inputStream);
391:                }
392:            }
393:
394:            /**
395:             * Generate the unique key.
396:             * This key must be unique inside the space of this component.
397:             *
398:             * @return The generated key consists of the src and width and height,
399:             *         and the color transform parameters
400:             */
401:            public Serializable getKey() {
402:                return super .getKey().toString() + ':' + this .fitUniform + ':'
403:                        + this .enlarge + ':' + this .width + ':' + this .height
404:                        + ":" + this .scaleColor[0] + ":" + this .scaleColor[1]
405:                        + ":" + this .scaleColor[2] + ":" + this .offsetColor[0]
406:                        + ":" + this .offsetColor[1] + ":" + this .offsetColor[2]
407:                        + ":" + this .quality[0] + ":"
408:                        + (this .grayscaleFilter == null ? "color" : "bw");
409:            }
410:
411:            public void recycle() {
412:                super.recycle();
413:                this.colorFilter = null;
414:                this.grayscaleFilter = null;
415:            }
416:        }
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