1 /* 2 * Copyright (c) 2009-2010 jMonkeyEngine 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are 7 * met: 8 * 9 * * Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 12 * * Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * * Neither the name of 'jMonkeyEngine' nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 24 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 25 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 26 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 27 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 28 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 29 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 package com.jme3.texture.plugins; 34 35 import com.jme3.texture.Image; 36 import com.jme3.util.BufferUtils; 37 import java.nio.ByteBuffer; 38 39 /** 40 * ImageFlipper is a utility class used to flip images across the Y axis. 41 * Due to the standard of where the image origin is between OpenGL and 42 * other software, this class is required. 43 * 44 * @author Kirill Vainer 45 */ 46 public class ImageFlipper { 47 flipImage(Image img, int index)48 public static void flipImage(Image img, int index){ 49 if (img.getFormat().isCompressed()) 50 throw new UnsupportedOperationException("Flipping compressed " + 51 "images is unsupported."); 52 53 int w = img.getWidth(); 54 int h = img.getHeight(); 55 int halfH = h / 2; 56 57 // bytes per pixel 58 int bpp = img.getFormat().getBitsPerPixel() / 8; 59 int scanline = w * bpp; 60 61 ByteBuffer data = img.getData(index); 62 ByteBuffer temp = BufferUtils.createByteBuffer(scanline); 63 64 data.rewind(); 65 for (int y = 0; y < halfH; y++){ 66 int oppY = h - y - 1; 67 // read in scanline 68 data.position(y * scanline); 69 data.limit(data.position() + scanline); 70 71 temp.rewind(); 72 temp.put(data); 73 74 } 75 } 76 77 } 78