| /* |
| * Copyright (C)2011, 2013 D. R. Commander. 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 the libjpeg-turbo Project 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 HOLDERS 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 org.libjpegturbo.turbojpeg; |
| |
| /** |
| * TurboJPEG lossless transformer |
| */ |
| public class TJTransformer extends TJDecompressor { |
| |
| /** |
| * Create a TurboJPEG lossless transformer instance. |
| */ |
| public TJTransformer() throws Exception { |
| init(); |
| } |
| |
| /** |
| * Create a TurboJPEG lossless transformer instance and associate the JPEG |
| * image stored in <code>jpegImage</code> with the newly created instance. |
| * |
| * @param jpegImage JPEG image buffer (size of the JPEG image is assumed to |
| * be the length of the array) |
| */ |
| public TJTransformer(byte[] jpegImage) throws Exception { |
| init(); |
| setJPEGImage(jpegImage, jpegImage.length); |
| } |
| |
| /** |
| * Create a TurboJPEG lossless transformer instance and associate the JPEG |
| * image of length <code>imageSize</code> bytes stored in |
| * <code>jpegImage</code> with the newly created instance. |
| * |
| * @param jpegImage JPEG image buffer |
| * |
| * @param imageSize size of the JPEG image (in bytes) |
| */ |
| public TJTransformer(byte[] jpegImage, int imageSize) throws Exception { |
| init(); |
| setJPEGImage(jpegImage, imageSize); |
| } |
| |
| /** |
| * Losslessly transform the JPEG image associated with this transformer |
| * instance into one or more JPEG images stored in the given destination |
| * buffers. Lossless transforms work by moving the raw coefficients from one |
| * JPEG image structure to another without altering the values of the |
| * coefficients. While this is typically faster than decompressing the |
| * image, transforming it, and re-compressing it, lossless transforms are not |
| * free. Each lossless transform requires reading and performing Huffman |
| * decoding on all of the coefficients in the source image, regardless of the |
| * size of the destination image. Thus, this method provides a means of |
| * generating multiple transformed images from the same source or of applying |
| * multiple transformations simultaneously, in order to eliminate the need to |
| * read the source coefficients multiple times. |
| * |
| * @param dstBufs an array of image buffers. <code>dstbufs[i]</code> will |
| * receive a JPEG image that has been transformed using the parameters in |
| * <code>transforms[i]</code>. Use {@link TJ#bufSize} to determine the |
| * maximum size for each buffer based on the transformed or cropped width and |
| * height and the level of subsampling used in the source image. |
| * |
| * @param transforms an array of {@link TJTransform} instances, each of |
| * which specifies the transform parameters and/or cropping region for the |
| * corresponding transformed output image |
| * |
| * @param flags the bitwise OR of one or more of |
| * {@link TJ#FLAG_BOTTOMUP TJ.FLAG_*} |
| */ |
| public void transform(byte[][] dstBufs, TJTransform[] transforms, |
| int flags) throws Exception { |
| if (jpegBuf == null) |
| throw new Exception("JPEG buffer not initialized"); |
| transformedSizes = transform(jpegBuf, jpegBufSize, dstBufs, transforms, |
| flags); |
| } |
| |
| /** |
| * Losslessly transform the JPEG image associated with this transformer |
| * instance and return an array of {@link TJDecompressor} instances, each of |
| * which has a transformed JPEG image associated with it. |
| * |
| * @param transforms an array of {@link TJTransform} instances, each of |
| * which specifies the transform parameters and/or cropping region for the |
| * corresponding transformed output image |
| * |
| * @return an array of {@link TJDecompressor} instances, each of |
| * which has a transformed JPEG image associated with it |
| * |
| * @param flags the bitwise OR of one or more of |
| * {@link TJ#FLAG_BOTTOMUP TJ.FLAG_*} |
| */ |
| public TJDecompressor[] transform(TJTransform[] transforms, int flags) |
| throws Exception { |
| byte[][] dstBufs = new byte[transforms.length][]; |
| if (jpegWidth < 1 || jpegHeight < 1) |
| throw new Exception("JPEG buffer not initialized"); |
| for (int i = 0; i < transforms.length; i++) { |
| int w = jpegWidth, h = jpegHeight; |
| if ((transforms[i].options & TJTransform.OPT_CROP) != 0) { |
| if (transforms[i].width != 0) w = transforms[i].width; |
| if (transforms[i].height != 0) h = transforms[i].height; |
| } |
| dstBufs[i] = new byte[TJ.bufSize(w, h, jpegSubsamp)]; |
| } |
| TJDecompressor[] tjd = new TJDecompressor[transforms.length]; |
| transform(dstBufs, transforms, flags); |
| for (int i = 0; i < transforms.length; i++) |
| tjd[i] = new TJDecompressor(dstBufs[i], transformedSizes[i]); |
| return tjd; |
| } |
| |
| /** |
| * Returns an array containing the sizes of the transformed JPEG images |
| * generated by the most recent transform operation. |
| * |
| * @return an array containing the sizes of the transformed JPEG images |
| * generated by the most recent transform operation |
| */ |
| public int[] getTransformedSizes() throws Exception { |
| if (transformedSizes == null) |
| throw new Exception("No image has been transformed yet"); |
| return transformedSizes; |
| } |
| |
| private native void init() throws Exception; |
| |
| private native int[] transform(byte[] srcBuf, int srcSize, byte[][] dstBufs, |
| TJTransform[] transforms, int flags) throws Exception; |
| |
| static { |
| TJLoader.load(); |
| } |
| |
| private int[] transformedSizes = null; |
| }; |