net.sourceforge.plantuml.png.PngIOMetadata Maven / Gradle / Ivy
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PlantUML is a component that allows to quickly write :
* sequence diagram,
* use case diagram,
* class diagram,
* activity diagram,
* component diagram,
* state diagram
* object diagram
/* ========================================================================
* PlantUML : a free UML diagram generator
* ========================================================================
*
* (C) Copyright 2009-2013, Arnaud Roques
*
* Project Info: http://plantuml.sourceforge.net
*
* This file is part of PlantUML.
*
* PlantUML is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PlantUML 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
* [Java is a trademark or registered trademark of Sun Microsystems, Inc.
* in the United States and other countries.]
*
* Original Author: Arnaud Roques
*
* Revision $Revision: 4231 $
*
*/
package net.sourceforge.plantuml.png;
import java.awt.image.RenderedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Iterator;
import javax.imageio.IIOImage;
import javax.imageio.ImageIO;
import javax.imageio.ImageWriter;
import net.sourceforge.plantuml.Log;
import com.sun.imageio.plugins.png.PNGMetadata;
public class PngIOMetadata {
private static final String copyleft = "Generated by http://plantuml.sourceforge.net";
public static void writeWithMetadata(RenderedImage image, OutputStream os, String metadata, int dpi) throws IOException {
final ImageWriter imagewriter = getImageWriter();
Log.debug("PngIOMetadata imagewriter=" + imagewriter);
imagewriter.setOutput(ImageIO.createImageOutputStream(os));
// Create & populate metadata
final PNGMetadata pngMetadata = new PNGMetadata();
if (dpi != 96) {
pngMetadata.pHYs_present = true;
pngMetadata.pHYs_unitSpecifier = PNGMetadata.PHYS_UNIT_METER;
pngMetadata.pHYs_pixelsPerUnitXAxis = (int) Math.round(dpi / .0254 + 0.5);
pngMetadata.pHYs_pixelsPerUnitYAxis = pngMetadata.pHYs_pixelsPerUnitXAxis;
}
if (metadata != null) {
pngMetadata.zTXt_keyword.add("plantuml");
pngMetadata.zTXt_compressionMethod.add(new Integer(0));
pngMetadata.zTXt_text.add(metadata);
// Log.println("metadata=" + metadata);
// if (metadata.equals("Generated by
// http://plantuml.sourceforge.net")) {
// throw new IllegalArgumentException();
// }
}
pngMetadata.tEXt_keyword.add("copyleft");
pngMetadata.tEXt_text.add(copyleft);
Log.debug("PngIOMetadata pngMetadata=" + pngMetadata);
// Render the PNG to file
final IIOImage iioImage = new IIOImage(image, null, pngMetadata);
Log.debug("PngIOMetadata iioImage=" + iioImage);
// Attach the metadata
imagewriter.write(null, iioImage, null);
Log.debug("PngIOMetadata before flush");
os.flush();
Log.debug("PngIOMetadata after flush");
}
private static ImageWriter getImageWriter() {
final Iterator iterator = ImageIO.getImageWritersBySuffix("png");
for (final Iterator it = ImageIO.getImageWritersBySuffix("png"); it.hasNext();) {
final ImageWriter imagewriter = iterator.next();
Log.debug("PngIOMetadata countImageWriter = " + it.next());
if (imagewriter.getClass().getName().equals("com.sun.imageio.plugins.png.PNGImageWriter")) {
Log.debug("PngIOMetadata Found sun PNGImageWriter");
return imagewriter;
}
}
Log.debug("Using first one");
return ImageIO.getImageWritersBySuffix("png").next();
}
}