/* Copyright (c) 2014 Jesper Öqvist <jesper@llbit.se>
*
* This file is part of Chunky.
*
* Chunky 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.
*
* Chunky 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 General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Chunky. If not, see <http://www.gnu.org/licenses/>.
*/
package se.llbit.chunky.resources;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteOrder;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.util.Scanner;
import org.apache.log4j.Logger;
public class PFMTexture extends AbstractHDRITexture {
private static final Logger logger = Logger.getLogger(PFMTexture.class);
public PFMTexture(File file) {
try {
FileInputStream in = new FileInputStream(file);
Scanner scan = new Scanner(in);
String fmt = scan.next();
int components = 3;
if (fmt.equals("PF")) {
components = 3;
} else if (fmt.equals("Pf")) {
components = 1;
} else {
logger.warn("Unknown PFM format!");
}
width = Integer.parseInt(scan.next());
height = Integer.parseInt(scan.next());
float endianScale = Float.parseFloat(scan.next());
boolean bigEndian = true;
// float scale;// not used yet
if (endianScale < 0) {
// scale = -endianScale;
bigEndian = false;
} else {
// scale = endianScale;
}
scan.close();
RandomAccessFile f = new RandomAccessFile(file, "r");
long len = f.length();
long start = len - width*height*components*4;
buf = new float[width*height*3];
int offset = 0;
FileChannel channel = f.getChannel();
MappedByteBuffer byteBuf = channel.map(FileChannel.MapMode.READ_ONLY, start, buf.length*4);
if (bigEndian) {
byteBuf.order(ByteOrder.BIG_ENDIAN);
} else {
byteBuf.order(ByteOrder.LITTLE_ENDIAN);
}
while (offset < buf.length) {
if (components == 3) {
buf[offset+0] = byteBuf.getFloat();
buf[offset+1] = byteBuf.getFloat();
buf[offset+2] = byteBuf.getFloat();
} else {
buf[offset+0] =
buf[offset+1] =
buf[offset+2] = byteBuf.getFloat();
}
offset += 3;
}
f.close();
} catch (IOException e) {
logger.error("Error loading PFM image: " + e.getMessage());
e.printStackTrace();
}
}
}