/*
* Copyright (c) 2009-2012 jMonkeyEngine
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions 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 'jMonkeyEngine' nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jme3.texture.image;
import java.nio.ByteBuffer;
class BitMaskImageCodec extends ImageCodec {
// Shifts
final int as, rs, gs, bs;
boolean be = false;
public BitMaskImageCodec(int bpp, int flags, int ac, int rc, int gc, int bc, int as, int rs, int gs, int bs) {
super(bpp, flags,
(int) (((long) 1 << ac) - 1),
(int) (((long) 1 << rc) - 1),
(int) (((long) 1 << gc) - 1),
(int) (((long) 1 << bc) - 1));
if (bpp > 4) {
throw new UnsupportedOperationException("Use ByteAlignedImageCodec for codecs with pixel sizes larger than 4 bytes");
}
this.as = as;
this.rs = rs;
this.gs = gs;
this.bs = bs;
}
private static int readPixelRaw(ByteBuffer buf, int idx, int bpp) {
//idx += bpp;
//int original = buf.get(--idx) & 0xff;
//while ((--bpp) > 0) {
// original = (original << 8) | (buf.get(--idx) & 0xff);
//}
//return original;
//return buf.getInt(idx) & (0xFFFFFFFF >>> (32 - bpp));
int pixel = 0;
buf.position(idx);
for (int i = 0; i < bpp; i++) {
pixel = pixel | (buf.get() & 0xff) << (i * 8);
}
return pixel;
}
private void writePixelRaw(ByteBuffer buf, int idx, int pixel, int bpp){
// buf.position(idx);
// if (!be){
// This works:
// while ((--bpp) >= 0){
// byte bt = (byte) ((pixel >> (bpp * 8)) & 0xff);
// buf.put(idx + bpp, bt);
// }
// ==
// } else {
// for (int i = bpp - 1; i >= 0; i--) {
// byte bt = (byte) ((pixel >> (i * 8)) & 0xff);
// buf.put(idx + i, bt);
// }
// }
buf.position(idx);
for (int i = 0; i < bpp; i++) {
buf.put( (byte)((pixel >> (8 * i)) & 0xff) );
}
}
@Override
public void readComponents(ByteBuffer buf, int x, int y, int width, int offset, int[] components, byte[] tmp) {
int inputPixel = readPixelRaw(buf, (x + y * width) * bpp + offset, bpp);
components[0] = (inputPixel >> as) & maxAlpha;
components[1] = (inputPixel >> rs) & maxRed;
components[2] = (inputPixel >> gs) & maxGreen;
components[3] = (inputPixel >> bs) & maxBlue;
}
public void writeComponents(ByteBuffer buf, int x, int y, int width, int offset, int[] components, byte[] tmp) {
// Shift components then mask them
// Map all components into a single bitspace
int outputPixel = ((components[0] & maxAlpha) << as)
| ((components[1] & maxRed) << rs)
| ((components[2] & maxGreen) << gs)
| ((components[3] & maxBlue) << bs);
// Find index in image where to write pixel.
// Write the resultant bitspace into the pixel.
writePixelRaw(buf, (x + y * width) * bpp + offset, outputPixel, bpp);
}
}