/* * 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; } }