From e71a8145d335a28a3bef3f20a85d2a430189f943 Mon Sep 17 00:00:00 2001
From: Kenneth Russel <kbrussel@alum.mit.edu>
Date: Wed, 1 Feb 2006 23:11:22 +0000
Subject: Refactored fast TGA writer into its own class to be able to share the
code between the Screenshot class and the anticipated tile rendering library.
git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@577 232f8b59-042b-4e1e-8c03-345bb8c30851
---
src/classes/com/sun/opengl/util/TGAWriter.java | 118 +++++++++++++++++++++++++
1 file changed, 118 insertions(+)
create mode 100755 src/classes/com/sun/opengl/util/TGAWriter.java
(limited to 'src/classes/com/sun/opengl/util/TGAWriter.java')
diff --git a/src/classes/com/sun/opengl/util/TGAWriter.java b/src/classes/com/sun/opengl/util/TGAWriter.java
new file mode 100755
index 000000000..aafc7b47e
--- /dev/null
+++ b/src/classes/com/sun/opengl/util/TGAWriter.java
@@ -0,0 +1,118 @@
+/*
+ * 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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