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* Copyright (C)2011 D. R. Commander. All Rights Reserved.
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* Copyright (C)2011, 2013 D. R. Commander. All Rights Reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* JPEG image structure to another without altering the values of the
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* coefficients. While this is typically faster than decompressing the
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* image, transforming it, and re-compressing it, lossless transforms are not
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* free. Each lossless transform requires reading and Huffman decoding all
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* of the coefficients in the source image, regardless of the size of the
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* destination image. Thus, this method provides a means of generating
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* multiple transformed images from the same source or of applying multiple
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* transformations simultaneously, in order to eliminate the need to read the
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* source coefficients multiple times.
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* free. Each lossless transform requires reading and performing Huffman
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* decoding on all of the coefficients in the source image, regardless of the
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* size of the destination image. Thus, this method provides a means of
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* generating multiple transformed images from the same source or of applying
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* multiple transformations simultaneously, in order to eliminate the need to
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* read the source coefficients multiple times.
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* @param dstBufs an array of image buffers. <code>dstbufs[i]</code> will
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* receive a JPEG image that has been transformed using the parameters in
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* <code>transforms[i]</code>. Use {@link TJ#bufSize} to determine the
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* maximum size for each buffer based on the cropped width and height.
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* maximum size for each buffer based on the transformed or cropped width and
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* @param transforms an array of {@link TJTransform} instances, each of
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* which specifies the transform parameters and/or cropping region for the
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* @param flags the bitwise OR of one or more of {@link TJ TJ.FLAG_*}
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public void transform(byte[][] dstBufs, TJTransform[] transforms,
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int flags) throws Exception {
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if(jpegBuf == null) throw new Exception("JPEG buffer not initialized");
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int flags) throws Exception {
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throw new Exception("JPEG buffer not initialized");
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transformedSizes = transform(jpegBuf, jpegBufSize, dstBufs, transforms,
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* Losslessly transform the JPEG image associated with this transformer
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* instance and return an array of {@link TJDecompressor} instances, each of
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public TJDecompressor[] transform(TJTransform[] transforms, int flags)
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throws Exception {
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byte[][] dstBufs = new byte[transforms.length][];
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if(jpegWidth < 1 || jpegHeight < 1)
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if (jpegWidth < 1 || jpegHeight < 1)
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throw new Exception("JPEG buffer not initialized");
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for(int i = 0; i < transforms.length; i++) {
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for (int i = 0; i < transforms.length; i++) {
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int w = jpegWidth, h = jpegHeight;
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if((transforms[i].options & TJTransform.OPT_CROP) != 0) {
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if(transforms[i].width != 0) w = transforms[i].width;
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if(transforms[i].height != 0) h = transforms[i].height;
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if ((transforms[i].options & TJTransform.OPT_CROP) != 0) {
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if (transforms[i].width != 0) w = transforms[i].width;
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if (transforms[i].height != 0) h = transforms[i].height;
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dstBufs[i] = new byte[TJ.bufSize(w, h, jpegSubsamp)];
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TJDecompressor[] tjd = new TJDecompressor[transforms.length];
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transform(dstBufs, transforms, flags);
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for(int i = 0; i < transforms.length; i++)
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for (int i = 0; i < transforms.length; i++)
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tjd[i] = new TJDecompressor(dstBufs[i], transformedSizes[i]);
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* Returns an array containing the sizes of the transformed JPEG images from
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* the most recent call to {@link #transform transform()}.
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* the most recent call to {@link #transform transform()}
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public int[] getTransformedSizes() throws Exception {
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if(transformedSizes == null)
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if (transformedSizes == null)
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throw new Exception("No image has been transformed yet");
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return transformedSizes;
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java/org/libjpegturbo/turbojpeg/TJTransformer.java
