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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* $Id$ */
package org.apache.fop.render.bitmap;
import java.awt.image.RenderedImage;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import org.apache.xmlgraphics.image.writer.ImageWriter;
import org.apache.xmlgraphics.image.writer.ImageWriterParams;
import org.apache.xmlgraphics.image.writer.ImageWriterRegistry;
import org.apache.commons.io.IOUtils;
import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.MimeConstants;
import org.apache.fop.area.PageViewport;
import org.apache.fop.render.java2d.Java2DRenderer;
/**
* PNG Renderer This class actually does not render itself, instead it extends
* <code>org.apache.fop.render.java2D.Java2DRenderer</code> and just encode
* rendering results into PNG format using Batik's image codec
*/
public class PNGRenderer extends Java2DRenderer {
/** The MIME type for png-Rendering */
public static final String MIME_TYPE = MimeConstants.MIME_PNG;
/** The file syntax prefix, eg. "page" will output "page1.png" etc */
private String filePrefix;
/** The output directory where images are to be written */
private File outputDir;
/** The OutputStream for the first Image */
private OutputStream firstOutputStream;
/** @see org.apache.fop.render.AbstractRenderer */
public String getMimeType() {
return MIME_TYPE;
}
/** @see org.apache.fop.render.Renderer#startRenderer(java.io.OutputStream) */
public void startRenderer(OutputStream outputStream) throws IOException {
log.info("rendering areas to PNG");
setOutputDirectory();
this.firstOutputStream = outputStream;
}
/**
* Sets the output directory, either from the outfile specified on the
* command line, or from the directory specified in configuration file. Also
* sets the file name syntax, eg. "page"
*/
private void setOutputDirectory() {
// the file provided on the command line
File f = getUserAgent().getOutputFile();
if (f == null) {
//No filename information available. Only the first page will be rendered.
outputDir = null;
filePrefix = null;
} else {
outputDir = f.getParentFile();
// extracting file name syntax
String s = f.getName();
int i = s.lastIndexOf(".");
if (s.charAt(i - 1) == '1') {
i--; // getting rid of the "1"
}
filePrefix = s.substring(0, i);
}
}
/** @see org.apache.fop.render.Renderer#stopRenderer() */
public void stopRenderer() throws IOException {
super.stopRenderer();
for (int i = 0; i < pageViewportList.size(); i++) {
OutputStream os = getCurrentOutputStream(i);
if (os == null) {
log.warn("No filename information available."
+ " Stopping early after the first page.");
break;
}
try {
// Do the rendering: get the image for this page
RenderedImage image = (RenderedImage) getPageImage((PageViewport) pageViewportList
.get(i));
// Encode this image
log.debug("Encoding page " + (i + 1));
ImageWriterParams params = new ImageWriterParams();
params.setResolution(Math.round(userAgent.getTargetResolution()));
// Encode PNG image
ImageWriter writer = ImageWriterRegistry.getInstance().getWriterFor(getMimeType());
log.debug("Writing image using " + writer.getClass().getName());
writer.writeImage(image, os, params);
} finally {
//Only close self-created OutputStreams
if (os != firstOutputStream) {
IOUtils.closeQuietly(os);
}
}
}
}
/**
* Builds the OutputStream corresponding to this page
* @param 0-based pageNumber
* @return the corresponding OutputStream
*/
private OutputStream getCurrentOutputStream(int pageNumber) {
if (pageNumber == 0) {
return firstOutputStream;
}
if (filePrefix == null) {
return null;
} else {
File f = new File(outputDir,
filePrefix + (pageNumber + 1) + ".png");
try {
OutputStream os = new BufferedOutputStream(new FileOutputStream(f));
return os;
} catch (FileNotFoundException e) {
new FOPException("Can't build the OutputStream\n" + e);
return null;
}
}
}
}
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