--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gnv-artifacts/src/main/java/de/intevation/gnv/raster/RasterToPPM.java	Fri Sep 28 12:14:00 2012 +0200
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2010 by Intevation GmbH
+ *
+ * This program is free software under the LGPL (>=v2.1)
+ * Read the file LGPL.txt coming with the software for details
+ * or visit http://www.gnu.org/licenses/ if it does not exist.
+ */
+
+package de.intevation.gnv.raster;
+
+import java.awt.Color;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+/**
+ * Little helper class to write a Raster into an output stream
+ * as a Netpbm PPM file.
+ * @author <a href="mailto:sascha.teichmann@intevation.de">Sascha L. Teichmann</a>
+ */
+public class RasterToPPM
+{
+    private RasterToPPM() {
+    }
+
+    /**
+     * Writes a Raster to a given stream as PPM.
+     * @param raster The raster to be written.
+     * @param palette The palette used to figure out the rgb values.
+     * @param out  The stream to write into.
+     * @throws IOException Thrown if some error occurred during writing
+     * data to the output stream.
+     */
+    public static void writeToPPM(
+        Raster       raster,
+        Palette      palette,
+        OutputStream out
+    )
+    throws IOException
+    {
+        int W = raster.getWidth();
+        int H = raster.getHeight();
+        out.write(("P6\n" + W + " " + H + "\n255\n").getBytes("US-ASCII"));
+        double [] values = raster.getValues();
+        int pos = 0;
+        byte [] data = new byte[W*3];
+        int black = Color.BLACK.getRGB();
+        for (int i = 0; i < H; ++i) {
+            for (int j = 0; j < data.length; ++pos) {
+                Palette.Entry entry = palette.getEntry(values[pos]);
+                int rgb = entry == null
+                    ? black
+                    : entry.getColor().getRGB();
+                data[j++] = (byte)((rgb >> 16) & 0xff);
+                data[j++] = (byte)((rgb >>  8) & 0xff);
+                data[j++] = (byte)( rgb        & 0xff);
+            }
+            out.write(data);
+        }
+        out.flush();
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :