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- /*
- * Copyright 2005-2006 The Apache Software Foundation.
- *
- * Licensed 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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