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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.batik.ext.awt.image.codec.PNGEncodeParam;
import org.apache.batik.ext.awt.image.codec.PNGImageEncoder;
import org.apache.fop.apps.FOPException;
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 = "image/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 PNGEncodeParam for the image */
private PNGEncodeParam renderParams;
/** The OutputStream for the first Image */
private OutputStream firstOutputStream;
/** @see org.apache.fop.render.AbstractRenderer */
public String getMimeType() {
return MIME_TYPE;
}
/** default constructor */
public PNGRenderer() {}
/** @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);
}
}
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;
}
// 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));
renderParams = PNGEncodeParam.getDefaultEncodeParam(image);
// Set resolution
float pixSzMM = userAgent.getPixelUnitToMillimeter();
// num Pixs in 1 Meter
int numPix = (int)((1000 / pixSzMM) + 0.5);
renderParams.setPhysicalDimension(numPix, numPix, 1); // 1 means 'pix/meter'
// Encode PNG image
PNGImageEncoder encoder = new PNGImageEncoder(os, renderParams);
encoder.encode(image);
os.flush();
}
}
/**
* 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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