java/org/libjpegturbo/turbojpeg/TJTransform.java

/*
 * 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
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package org.libjpegturbo.turbojpeg;

import java.awt.*;

/**
 * Lossless transform parameters
 */
public class TJTransform extends Rectangle {

  private static final long serialVersionUID = -127367705761430371L;

  /**
   * The number of lossless transform operations
   */
  public static final int NUMOP         = 8;
  /**
   * Do not transform the position of the image pixels.
   */
  public static final int OP_NONE       = 0;
  /**
   * Flip (mirror) image horizontally.  This transform is imperfect if there
   * are any partial MCU blocks on the right edge.
   * @see #OPT_PERFECT
   */
  public static final int OP_HFLIP      = 1;
  /**
   * Flip (mirror) image vertically.  This transform is imperfect if there are
   * any partial MCU blocks on the bottom edge.
   * @see #OPT_PERFECT
   */
  public static final int OP_VFLIP      = 2;
  /**
   * Transpose image (flip/mirror along upper left to lower right axis).  This
   * transform is always perfect.
   * @see #OPT_PERFECT
   */
  public static final int OP_TRANSPOSE  = 3;
  /**
   * Transverse transpose image (flip/mirror along upper right to lower left
   * axis).  This transform is imperfect if there are any partial MCU blocks in
   * the image.
   * @see #OPT_PERFECT
   */
  public static final int OP_TRANSVERSE = 4;
  /**
   * Rotate image clockwise by 90 degrees.  This transform is imperfect if
   * there are any partial MCU blocks on the bottom edge.
   * @see #OPT_PERFECT
   */
  public static final int OP_ROT90      = 5;
  /**
   * Rotate image 180 degrees.  This transform is imperfect if there are any
   * partial MCU blocks in the image.
   * @see #OPT_PERFECT
   */
  public static final int OP_ROT180     = 6;
  /**
   * Rotate image counter-clockwise by 90 degrees.  This transform is imperfect
   * if there are any partial MCU blocks on the right edge.
   * @see #OPT_PERFECT
   */
  public static final int OP_ROT270     = 7;


  /**
   * This option will cause {@link TJTransformer#transform
   * TJTransformer.transform()} to throw an exception if the transform is not
   * perfect.  Lossless transforms operate on MCU blocks, whose size depends on
   * the level of chrominance subsampling used.  If the image's width or height
   * is not evenly divisible by the MCU block size (see {@link TJ#getMCUWidth}
   * and {@link TJ#getMCUHeight}), then there will be partial MCU blocks on the
   * right and/or bottom edges.   It is not possible to move these partial MCU
   * blocks to the top or left of the image, so any transform that would
   * require that is "imperfect."  If this option is not specified, then any
   * partial MCU blocks that cannot be transformed will be left in place, which
   * will create odd-looking strips on the right or bottom edge of the image.
   */
  public static final int OPT_PERFECT  = 1;
  /**
   * This option will discard any partial MCU blocks that cannot be
   * transformed.
   */
  public static final int OPT_TRIM     = 2;
  /**
   * This option will enable lossless cropping.
   */
  public static final int OPT_CROP     = 4;
  /**
   * This option will discard the color data in the input image and produce
   * a grayscale output image.
   */
  public static final int OPT_GRAY     = 8;
  /**
   * This option will prevent {@link TJTransformer#transform
   * TJTransformer.transform()} from outputting a JPEG image for this
   * particular transform.  This can be used in conjunction with a custom
   * filter to capture the transformed DCT coefficients without transcoding
   * them.
   */
  public static final int OPT_NOOUTPUT = 16;


  /**
   * Create a new lossless transform instance.
   */
  public TJTransform() {
  }

  /**
   * Create a new lossless transform instance with the given parameters.
   *
   * @param x the left boundary of the cropping region.  This must be evenly
   * divisible by the MCU block width (see {@link TJ#getMCUWidth})
   *
   * @param y the upper boundary of the cropping region.  This must be evenly
   * divisible by the MCU block height (see {@link TJ#getMCUHeight})
   *
   * @param w the width of the cropping region.  Setting this to 0 is the
   * equivalent of setting it to (width of the source JPEG image -
   * <code>x</code>).
   *
   * @param h the height of the cropping region.  Setting this to 0 is the
   * equivalent of setting it to (height of the source JPEG image -
   * <code>y</code>).
   *
   * @param op one of the transform operations (<code>OP_*</code>)
   *
   * @param options the bitwise OR of one or more of the transform options
   * (<code>OPT_*</code>)
   *
   * @param cf an instance of an object that implements the {@link
   * TJCustomFilter} interface, or null if no custom filter is needed
   */
  public TJTransform(int x, int y, int w, int h, int op, int options,
                     TJCustomFilter cf) {
    super(x, y, w, h);
    this.op = op;
    this.options = options;
    this.cf = cf;
  }

  /**
   * Create a new lossless transform instance with the given parameters.
   *
   * @param r a <code>Rectangle</code> instance that specifies the cropping
   * region.  See {@link
   * #TJTransform(int, int, int, int, int, int, TJCustomFilter)} for more
   * detail.
   *
   * @param op one of the transform operations (<code>OP_*</code>)
   *
   * @param options the bitwise OR of one or more of the transform options
   * (<code>OPT_*</code>)
   *
   * @param cf an instance of an object that implements the {@link
   * TJCustomFilter} interface, or null if no custom filter is needed
   */
  public TJTransform(Rectangle r, int op, int options,
                     TJCustomFilter cf) {
    super(r);
    this.op = op;
    this.options = options;
    this.cf = cf;
  }

  /**
   * Transform operation (one of <code>OP_*</code>)
   */
  public int op = 0;

  /**
   * Transform options (bitwise OR of one or more of <code>OPT_*</code>)
   */
  public int options = 0;

  /**
   * Custom filter instance
   */
  public TJCustomFilter cf = null;
}