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/*
* Copyright (c) 2005 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
* INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
* MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
* ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
* DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
* DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
* ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
* SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed or intended for use
* in the design, construction, operation or maintenance of any nuclear
* facility.
*/
package com.sun.opengl.util;
import java.io.*;
import java.nio.*;
import java.nio.channels.*;
/**
* Utility class which helps take fast screenshots of OpenGL rendering
* results into Targa-format files. Used by the {@link
* com.sun.opengl.util.Screenshot Screenshot} class; can also be used
* in conjunction with the {@link com.sun.opengl.util.TileRenderer
* TileRenderer} class. <P>
*/
public class TGAWriter {
private static final int TARGA_HEADER_SIZE = 18;
private FileChannel ch;
private ByteBuffer buf;
/** Constructor for the TGAWriter. */
public TGAWriter() {
}
/**
* Opens the specified Targa file for writing, overwriting any
* existing file, and sets up the header of the file expecting the
* data to be filled in before closing it.
*
* @param file the file to write containing the screenshot
* @param width the width of the current drawable
* @param height the height of the current drawable
* @param alpha whether the alpha channel should be saved. If true,
* requires GL_EXT_abgr extension to be present.
*
* @throws IOException if an I/O error occurred while writing the
* file
*/
public void open(File file,
int width,
int height,
boolean alpha) throws IOException {
RandomAccessFile out = new RandomAccessFile(file, "rw");
ch = out.getChannel();
int pixelSize = (alpha ? 32 : 24);
int numChannels = (alpha ? 4 : 3);
int fileLength = TARGA_HEADER_SIZE + width * height * numChannels;
out.setLength(fileLength);
MappedByteBuffer image = ch.map(FileChannel.MapMode.READ_WRITE, 0, fileLength);
// write the TARGA header
image.put(0, (byte) 0).put(1, (byte) 0);
image.put(2, (byte) 2); // uncompressed type
image.put(12, (byte) (width & 0xFF)); // width
image.put(13, (byte) (width >> 8)); // width
image.put(14, (byte) (height & 0xFF)); // height
image.put(15, (byte) (height >> 8)); // height
image.put(16, (byte) pixelSize); // pixel size
// go to image data position
image.position(TARGA_HEADER_SIZE);
// jogl needs a sliced buffer
buf = image.slice();
}
/**
* Returns the ByteBuffer corresponding to the data for the image.
* This must be filled in with data in either BGR or BGRA format
* depending on whether an alpha channel was specified during
* open().
*/
public ByteBuffer getImageData() {
return buf;
}
public void close() throws IOException {
// close the file channel
ch.close();
buf = null;
}
}
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