ingo@1115: /*
ingo@1115:  * Copyright (c) 2010 by Intevation GmbH
ingo@1115:  *
ingo@1115:  * This program is free software under the LGPL (>=v2.1)
ingo@1115:  * Read the file LGPL.txt coming with the software for details
ingo@1115:  * or visit http://www.gnu.org/licenses/ if it does not exist.
ingo@1115:  */
ingo@1115: 
sascha@495: package de.intevation.gnv.raster;
sascha@495: 
sascha@779: import java.awt.Color;
sascha@779: 
sascha@495: import java.io.IOException;
sascha@495: import java.io.OutputStream;
sascha@495: 
sascha@495: /**
sascha@801:  * Little helper class to write a Raster into an output stream
sascha@801:  * as a Netpbm PPM file.
sascha@780:  * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
sascha@495:  */
sascha@495: public class RasterToPPM
sascha@495: {
sascha@495:     private RasterToPPM() {
sascha@495:     }
sascha@495: 
sascha@801:     /**
sascha@801:      * Writes a Raster to a given stream as PPM.
sascha@801:      * @param raster The raster to be written.
sascha@801:      * @param palette The palette used to figure out the rgb values.
sascha@801:      * @param out  The stream to write into.
sascha@801:      * @throws IOException Thrown if some error occurred during writing
sascha@801:      * data to the output stream.
sascha@801:      */
sascha@801:     public static void writeToPPM(
sascha@801:         Raster       raster,
sascha@801:         Palette      palette,
sascha@801:         OutputStream out
sascha@801:     )
sascha@495:     throws IOException
sascha@495:     {
sascha@495:         int W = raster.getWidth();
sascha@495:         int H = raster.getHeight();
sascha@495:         out.write(("P6\n" + W + " " + H + "\n255\n").getBytes("US-ASCII"));
sascha@495:         double [] values = raster.getValues();
sascha@495:         int pos = 0;
sascha@495:         byte [] data = new byte[W*3];
sascha@495:         int black = Color.BLACK.getRGB();
sascha@495:         for (int i = 0; i < H; ++i) {
sascha@495:             for (int j = 0; j < data.length; ++pos) {
sascha@495:                 Palette.Entry entry = palette.getEntry(values[pos]);
sascha@495:                 int rgb = entry == null
sascha@495:                     ? black
sascha@495:                     : entry.getColor().getRGB();
sascha@495:                 data[j++] = (byte)((rgb >> 16) & 0xff);
sascha@495:                 data[j++] = (byte)((rgb >>  8) & 0xff);
sascha@495:                 data[j++] = (byte)( rgb        & 0xff);
sascha@495:             }
sascha@495:             out.write(data);
sascha@495:         }
sascha@495:         out.flush();
sascha@495:     }
sascha@495: }
sascha@495: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :