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| 1 /* |
| 2 * Copyright (C)2011, 2013 D. R. Commander. All Rights Reserved. |
| 3 * |
| 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are met: |
| 6 * |
| 7 * - Redistributions of source code must retain the above copyright notice, |
| 8 * this list of conditions and the following disclaimer. |
| 9 * - Redistributions in binary form must reproduce the above copyright notice, |
| 10 * this list of conditions and the following disclaimer in the documentation |
| 11 * and/or other materials provided with the distribution. |
| 12 * - Neither the name of the libjpeg-turbo Project nor the names of its |
| 13 * contributors may be used to endorse or promote products derived from this |
| 14 * software without specific prior written permission. |
| 15 * |
| 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS", |
| 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE |
| 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 26 * POSSIBILITY OF SUCH DAMAGE. |
| 27 */ |
| 28 |
| 29 package org.libjpegturbo.turbojpeg; |
| 30 |
| 31 import java.awt.*; |
| 32 import java.nio.*; |
| 33 |
| 34 /** |
| 35 * Custom filter callback interface |
| 36 */ |
| 37 public interface TJCustomFilter { |
| 38 |
| 39 /** |
| 40 * A callback function that can be used to modify the DCT coefficients after |
| 41 * they are losslessly transformed but before they are transcoded to a new |
| 42 * JPEG image. This allows for custom filters or other transformations to be |
| 43 * applied in the frequency domain. |
| 44 * |
| 45 * @param coeffBuffer a buffer containing transformed DCT coefficients. |
| 46 * (NOTE: this buffer is not guaranteed to be valid once the callback |
| 47 * returns, so applications wishing to hand off the DCT coefficients to |
| 48 * another function or library should make a copy of them within the body of |
| 49 * the callback.) |
| 50 * |
| 51 * @param bufferRegion rectangle containing the width and height of |
| 52 * <code>coeffBuffer</code> as well as its offset relative to the component |
| 53 * plane. TurboJPEG implementations may choose to split each component plane |
| 54 * into multiple DCT coefficient buffers and call the callback function once |
| 55 * for each buffer. |
| 56 * |
| 57 * @param planeRegion rectangle containing the width and height of the |
| 58 * component plane to which <code>coeffBuffer</code> belongs |
| 59 * |
| 60 * @param componentID ID number of the component plane to which |
| 61 * <code>coeffBuffer</code> belongs (Y, Cb, and Cr have, respectively, ID's |
| 62 * of 0, 1, and 2 in typical JPEG images.) |
| 63 * |
| 64 * @param transformID ID number of the transformed image to which |
| 65 * <code>coeffBuffer</code> belongs. This is the same as the index of the |
| 66 * transform in the <code>transforms</code> array that was passed to {@link |
| 67 * TJTransformer#transform TJTransformer.transform()}. |
| 68 * |
| 69 * @param transform a {@link TJTransform} instance that specifies the |
| 70 * parameters and/or cropping region for this transform |
| 71 */ |
| 72 void customFilter(ShortBuffer coeffBuffer, Rectangle bufferRegion, |
| 73 Rectangle planeRegion, int componentID, int transformID, |
| 74 TJTransform transform) |
| 75 throws TJException; |
| 76 } |
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