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Open HTML to PDF is a CSS 2.1 renderer written in Java. This artifact contains the core rendering and layout code.
/*
* {{{ header & license
* Copyright (c) 2007 Patrick Wright
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* }}}
*/
package com.openhtmltopdf.simple;
import java.awt.image.BufferedImage;
import java.io.*;
import com.openhtmltopdf.swing.Java2DRenderer;
import com.openhtmltopdf.util.FSImageWriter;
/**
*
* ImageRenderer supports rendering of XHTML documents to image formats, writing out the generated image to an outputstream
* or a file in a given image formate. There are two static utility methods, one for rendering
* a {@link java.net.URL}, {@link #renderToImage(String,String)} and one
* for rendering a {@link java.io.File}, {@link #renderToImage(java.io.File,String)}
*
* You can use this utility from the command line by passing in
* the URL or file location as first parameter, and output file path as second
* parameter:
*
* java -cp %classpath% org.xhtmlrenderer.simple.ImageRenderer ![]()
*
* If the second parameters is not provided, a PNG-format image will be created
* in the same directory as the source (if source is a file) or as a temp file
* in the standard temp directory; the output file name will be printed out
* in either case.
*
* Image width must always be supplied; height is determined automatically.
*
* @see org.xhtmlrenderer.simple.PDFRenderer
* @author Pete Brant
* @author Patrick Wright
*/
public class ImageRenderer {
public static final int DEFAULT_WIDTH = 1024;
/**
* Renders the XML file at the given URL as an image file at the target location. Width must be provided,
* height is determined automatically based on content and CSS.
*
* @param url url for the XML file to render
* @param path path to the PDF file to create
* @param width Width in pixels to which the document should be constrained.
*
* @throws java.io.IOException if the input URL, or output path location is invalid
*/
public static BufferedImage renderToImage(String url, String path, int width) throws IOException {
return renderImageToOutput(url, new FSImageWriter(), path, width);
}
/**
* Renders the XML file at the given URL as an image file at the target location.
*
* @param url url for the XML file to render
* @param path path to the PDF file to create
* @param width Width in pixels to which the document should be constrained.
* @param height Height in pixels to which the document should be constrained.
*
* @throws java.io.IOException if the input URL, or output path location is invalid
*/
public static BufferedImage renderToImage(String url, String path, int width, int height) throws IOException {
return renderImageToOutput(url, new FSImageWriter(), path, width);
}
/**
* Renders the XML file as an image file at the target location. Width must be provided, height is determined
* automatically based on content and CSS.
*
* @param inFile XML file to render
* @param path path to the image file to create
* @param width Width in pixels to which the document should be constrained.
*
* @throws java.io.IOException if the input URL, or output path location is invalid
*/
public static BufferedImage renderToImage(File inFile, String path, int width) throws IOException {
return renderToImage(inFile.toURI().toURL().toExternalForm(), path, width);
}
/**
* Renders the XML file as an image file at the target location. Width must be provided, height is determined
* automatically based on content and CSS.
*
* @param inFile XML file to render
* @param path path to the image file to create
* @param width Width in pixels to which the document should be constrained.
* @param height Height in pixels to which the document should be constrained.
*
* @throws java.io.IOException if the input URL, or output path location is invalid
*/
public static BufferedImage renderToImage(File inFile, String path, int width, int height) throws IOException {
return renderToImage(inFile.toURI().toURL().toExternalForm(), path, width, height);
}
/**
* Renders a document at a given URL and writes it out using the FSImageWriter provided (e.g. to a file
* or outputstream).
*
* @param url
* @param fsw
* @param path
* @param width
*/
public static BufferedImage renderImageToOutput(String url, FSImageWriter fsw, String path, int width)
throws IOException {
BufferedImage image;
OutputStream os = null;
try {
Java2DRenderer renderer = new Java2DRenderer(url, url, width);
os = new BufferedOutputStream(new FileOutputStream(path));
image = renderer.getImage();
fsw.write(image, os);
return image;
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
// ignore
}
}
}
}
/**
* Renders a file or URL to an image file. Command line use: first
* argument is URL or file path, second argument is path to image file to generate.
*
* @param args see desc
* @throws java.io.IOException if source could not be read, or if image path is invalid
*/
public static void main(String[] args) throws IOException {
if (args.length != 1) {
usage("Incorrect argument list.");
}
String url = args[0];
if (url.indexOf("://") == -1) {
// maybe it's a file
File f = new File(url);
if (f.exists()) {
String output = f.getAbsolutePath();
output = output.substring(0, output.lastIndexOf(".")) + ".png";
System.out.println("Saving image to " + output);
renderToImage(f, output, DEFAULT_WIDTH);
} else {
usage("File to render is not found: " + url);
}
} else {
File out = File.createTempFile("fs", ".png");
System.out.println("Saving image to " + out.getAbsolutePath());
renderToImage(url, out.getAbsolutePath(), DEFAULT_WIDTH);
}
}
/**
* prints out usage information, with optional error message
*/
private static void usage(String err) {
if (err != null && err.length() > 0) {
System.err.println("==>" + err);
}
System.err.println("Usage: ... [url]");
System.exit(1);
}
}