java/org/libjpegturbo/turbojpeg/YUVImage.java - third_party/libjpeg-turbo - Git at Google

 /*
  * Copyright (C)2014 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;

 /**
  * This class encapsulates a YUV planar image and the metadata
  * associated with it.  The TurboJPEG API allows both the JPEG compression and
  * decompression pipelines to be split into stages:  YUV encode, compress from
  * YUV, decompress to YUV, and YUV decode.  A <code>YUVImage</code> instance
  * serves as the destination image for YUV encode and decompress-to-YUV
  * operations and as the source image for compress-from-YUV and YUV decode
  * operations.
  * <p>
  * Technically, the JPEG format uses the YCbCr colorspace (which technically is
  * not a "colorspace" but rather a "color transform"), but per the convention
  * of the digital video community, the TurboJPEG API uses "YUV" to refer to an
  * image format consisting of Y, Cb, and Cr image planes.
  * <p>
  * Each plane is simply a 2D array of bytes, each byte representing the value
  * of one of the components (Y, Cb, or Cr) at a particular location in the
  * image.  The width and height of each plane are determined by the image
  * width, height, and level of chrominance subsampling.  The luminance plane
  * width is the image width padded to the nearest multiple of the horizontal
  * subsampling factor (2 in the case of 4:2:0 and 4:2:2, 4 in the case of
  * 4:1:1, 1 in the case of 4:4:4 or grayscale.)  Similarly, the luminance plane
  * height is the image height padded to the nearest multiple of the vertical
  * subsampling factor (2 in the case of 4:2:0 or 4:4:0, 1 in the case of 4:4:4
  * or grayscale.)  The chrominance plane width is equal to the luminance plane
  * width divided by the horizontal subsampling factor, and the chrominance
  * plane height is equal to the luminance plane height divided by the vertical
  * subsampling factor.
  * <p>
  * For example, if the source image is 35 x 35 pixels and 4:2:2 subsampling is
  * used, then the luminance plane would be 36 x 35 bytes, and each of the
  * chrominance planes would be 18 x 35 bytes.  If you specify a line padding of
  * 4 bytes on top of this, then the luminance plane would be 36 x 35 bytes, and
  * each of the chrominance planes would be 20 x 35 bytes.
  */
 public class YUVImage {

   private static final String NO_ASSOC_ERROR =
     "No image data is associated with this instance";

   /**
    * Create a new <code>YUVImage</code> instance backed by separate image
    * planes, and allocate memory for the image planes.
    *
    * @param width width (in pixels) of the YUV image
    *
    * @param strides an array of integers, each specifying the number of bytes
    * per line in the corresponding plane of the YUV image.  Setting the stride
    * for any plane to 0 is the same as setting it to the plane width (see
    * {@link YUVImage above}.)  If <code>strides</code> is null, then the
    * strides for all planes will be set to their respective plane widths.  When
    * using this constructor, the stride for each plane must be equal to or
    * greater than the plane width.
    *
    * @param height height (in pixels) of the YUV image
    *
    * @param subsamp the level of chrominance subsampling to be used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(int width, int[] strides, int height, int subsamp)
     throws Exception {
     setBuf(null, null, width, strides, height, subsamp, true);
   }

   /**
    * Create a new <code>YUVImage</code> instance backed by a unified image
    * buffer, and allocate memory for the image buffer.
    *
    * @param width width (in pixels) of the YUV image
    *
    * @param pad Each line of each plane in the YUV image buffer will be padded
    * to this number of bytes (must be a power of 2.)
    *
    * @param height height (in pixels) of the YUV image
    *
    * @param subsamp the level of chrominance subsampling to be used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(int width, int pad, int height, int subsamp)
     throws Exception {
     setBuf(new byte[TJ.bufSizeYUV(width, pad, height, subsamp)], width, pad,
            height, subsamp);
   }

   /**
    * Create a new <code>YUVImage</code> instance from a set of existing image
    * planes.
    *
    * @param planes an array of buffers representing the Y, U (Cb), and V (Cr)
    * image planes (or just the Y plane, if the image is grayscale.)   These
    * planes can be contiguous or non-contiguous in memory.  Plane
    * <code>i</code> should be at least <code>offsets[i] +
    * {@link TJ#planeSizeYUV TJ.planeSizeYUV}(i, width, strides[i], height, subsamp)</code>
    * bytes in size.
    *
    * @param offsets If this <code>YUVImage</code> instance represents a
    * subregion of a larger image, then <code>offsets[i]</code> specifies the
    * offset (in bytes) of the subregion within plane <code>i</code> of the
    * larger image.  Setting this to null is the same as setting the offsets for
    * all planes to 0.
    *
    * @param width width (in pixels) of the new YUV image (or subregion)
    *
    * @param strides an array of integers, each specifying the number of bytes
    * per line in the corresponding plane of the YUV image.  Setting the stride
    * for any plane to 0 is the same as setting it to the plane width (see
    * {@link YUVImage above}.)  If <code>strides</code> is null, then the
    * strides for all planes will be set to their respective plane widths.  You
    * can adjust the strides in order to add an arbitrary amount of line padding
    * to each plane or to specify that this <code>YUVImage</code> instance is a
    * subregion of a larger image (in which case, <code>strides[i]</code> should
    * be set to the plane width of plane <code>i</code> in the larger image.)
    *
    * @param height height (in pixels) of the new YUV image (or subregion)
    *
    * @param subsamp the level of chrominance subsampling used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(byte[][] planes, int[] offsets, int width, int[] strides,
                   int height, int subsamp) throws Exception {
     setBuf(planes, offsets, width, strides, height, subsamp, false);
   }

   /**
    * Create a new <code>YUVImage</code> instance from an existing unified image
    * buffer.
    *
    * @param yuvImage image buffer that contains or will contain YUV planar
    * image data.  Use {@link TJ#bufSizeYUV} to determine the minimum size for
    * this buffer.  The Y, U (Cb), and V (Cr) image planes are stored
    * sequentially in the buffer (see {@link YUVImage above} for a description
    * of the image format.)
    *
    * @param width width (in pixels) of the YUV image
    *
    * @param pad the line padding used in the YUV image buffer.  For
    * instance, if each line in each plane of the buffer is padded to the
    * nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.
    *
    * @param height height (in pixels) of the YUV image
    *
    * @param subsamp the level of chrominance subsampling used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public YUVImage(byte[] yuvImage, int width, int pad, int height,
                   int subsamp) throws Exception {
     setBuf(yuvImage, width, pad, height, subsamp);
   }

   /**
    * Assign a set of image planes to this <code>YUVImage</code> instance.
    *
    * @param planes an array of buffers representing the Y, U (Cb), and V (Cr)
    * image planes (or just the Y plane, if the image is grayscale.)  These
    * planes can be contiguous or non-contiguous in memory.  Plane
    * <code>i</code> should be at least <code>offsets[i] +
    * {@link TJ#planeSizeYUV TJ.planeSizeYUV}(i, width, strides[i], height, subsamp)</code>
    * bytes in size.
    *
    * @param offsets If this <code>YUVImage</code> instance represents a
    * subregion of a larger image, then <code>offsets[i]</code> specifies the
    * offset (in bytes) of the subregion within plane <code>i</code> of the
    * larger image.  Setting this to null is the same as setting the offsets for
    * all planes to 0.
    *
    * @param width width (in pixels) of the YUV image (or subregion)
    *
    * @param strides an array of integers, each specifying the number of bytes
    * per line in the corresponding plane of the YUV image.  Setting the stride
    * for any plane to 0 is the same as setting it to the plane width (see
    * {@link YUVImage above}.)  If <code>strides</code> is null, then the
    * strides for all planes will be set to their respective plane widths.  You
    * can adjust the strides in order to add an arbitrary amount of line padding
    * to each plane or to specify that this <code>YUVImage</code> image is a
    * subregion of a larger image (in which case, <code>strides[i]</code> should
    * be set to the plane width of plane <code>i</code> in the larger image.)
    *
    * @param height height (in pixels) of the YUV image (or subregion)
    *
    * @param subsamp the level of chrominance subsampling used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
                      int height, int subsamp) throws Exception {
     setBuf(planes, offsets, width, strides, height, subsamp, false);
   }

   private void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
                      int height, int subsamp, boolean alloc) throws Exception {
     if ((planes == null && !alloc) || width < 1 || height < 1 || subsamp < 0 ||
         subsamp >= TJ.NUMSAMP)
       throw new Exception("Invalid argument in YUVImage::setBuf()");

     int nc = (subsamp == TJ.SAMP_GRAY ? 1 : 3);
     if (planes.length != nc || (offsets != null && offsets.length != nc) ||
         (strides != null && strides.length != nc))
       throw new Exception("YUVImage::setBuf(): planes, offsets, or strides array is the wrong size");

     if (offsets == null)
       offsets = new int[nc];
     if (strides == null)
       strides = new int[nc];

     for (int i = 0; i < nc; i++) {
       int pw = TJ.planeWidth(i, width, subsamp);
       int ph = TJ.planeHeight(i, height, subsamp);
       int planeSize = TJ.planeSizeYUV(i, width, strides[i], height, subsamp);

       if (strides[i] == 0)
         strides[i] = pw;
       if (alloc) {
         if (strides[i] < pw)
           throw new Exception("Stride must be >= plane width when allocating a new YUV image");
         planes[i] = new byte[strides[i] * ph];
       }
       if (planes[i] == null || offsets[i] < 0)
         throw new Exception("Invalid argument in YUVImage::setBuf()");
       if (strides[i] < 0 && offsets[i] - planeSize + pw < 0)
         throw new Exception("Stride for plane " + i + " would cause memory to be accessed below plane boundary");
       if (planes[i].length < offsets[i] + planeSize)
         throw new Exception("Image plane " + i + " is not large enough");
     }

     yuvPlanes = planes;
     yuvOffsets = offsets;
     yuvWidth = width;
     yuvStrides = strides;
     yuvHeight = height;
     yuvSubsamp = subsamp;
   }

   /**
    * Assign a unified image buffer to this <code>YUVImage</code> instance.
    *
    * @param yuvImage image buffer that contains or will contain YUV planar
    * image data.  Use {@link TJ#bufSizeYUV} to determine the minimum size for
    * this buffer.  The Y, U (Cb), and V (Cr) image planes are stored
    * sequentially in the buffer (see {@link YUVImage above} for a description
    * of the image format.)
    *
    * @param width width (in pixels) of the YUV image
    *
    * @param pad the line padding used in the YUV image buffer.  For
    * instance, if each line in each plane of the buffer is padded to the
    * nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.
    *
    * @param height height (in pixels) of the YUV image
    *
    * @param subsamp the level of chrominance subsampling used in the YUV
    * image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
    */
   public void setBuf(byte[] yuvImage, int width, int pad, int height,
                      int subsamp) throws Exception {
     if (yuvImage == null || width < 1 || pad < 1 || ((pad & (pad - 1)) != 0) ||
         height < 1 || subsamp < 0 || subsamp >= TJ.NUMSAMP)
       throw new Exception("Invalid argument in YUVImage::setBuf()");
     if (yuvImage.length < TJ.bufSizeYUV(width, pad, height, subsamp))
       throw new Exception("YUV image buffer is not large enough");

     int nc = (subsamp == TJ.SAMP_GRAY ? 1 : 3);
     byte[][] planes = new byte[nc][];
     int[] strides = new int[nc];
     int[] offsets = new int[nc];

     planes[0] = yuvImage;
     strides[0] = PAD(TJ.planeWidth(0, width, subsamp), pad);
     if (subsamp != TJ.SAMP_GRAY) {
       strides[1] = strides[2] = PAD(TJ.planeWidth(1, width, subsamp), pad);
       planes[1] = planes[2] = yuvImage;
       offsets[1] = offsets[0] +
         strides[0] * TJ.planeHeight(0, height, subsamp);
       offsets[2] = offsets[1] +
         strides[1] * TJ.planeHeight(1, height, subsamp);
     }

     yuvPad = pad;
     setBuf(planes, offsets, width, strides, height, subsamp);
   }

   /**
    * Returns the width of the YUV image (or subregion.)
    *
    * @return the width of the YUV image (or subregion)
    */
   public int getWidth() throws Exception {
     if (yuvWidth < 1)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvWidth;
   }

   /**
    * Returns the height of the YUV image (or subregion.)
    *
    * @return the height of the YUV image (or subregion)
    */
   public int getHeight() throws Exception {
     if (yuvHeight < 1)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvHeight;
   }

   /**
    * Returns the line padding used in the YUV image buffer (if this image is
    * stored in a unified buffer rather than separate image planes.)
    *
    * @return the line padding used in the YUV image buffer
    */
   public int getPad() throws Exception {
     if (yuvPlanes == null)
       throw new Exception(NO_ASSOC_ERROR);
     if (yuvPad < 1 || ((yuvPad & (yuvPad - 1)) != 0))
       throw new Exception("Image is not stored in a unified buffer");
     return yuvPad;
   }

   /**
    * Returns the number of bytes per line of each plane in the YUV image.
    *
    * @return the number of bytes per line of each plane in the YUV image
    */
   public int[] getStrides() throws Exception {
     if (yuvStrides == null)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvStrides;
   }

   /**
    * Returns the offsets (in bytes) of each plane within the planes of a larger
    * YUV image.
    *
    * @return the offsets (in bytes) of each plane within the planes of a larger
    * YUV image
    */
   public int[] getOffsets() throws Exception {
     if (yuvOffsets == null)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvOffsets;
   }

   /**
    * Returns the level of chrominance subsampling used in the YUV image.  See
    * {@link TJ#SAMP_444 TJ.SAMP_*}.
    *
    * @return the level of chrominance subsampling used in the YUV image
    */
   public int getSubsamp() throws Exception {
     if (yuvSubsamp < 0 || yuvSubsamp >= TJ.NUMSAMP)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvSubsamp;
   }

   /**
    * Returns the YUV image planes.  If the image is stored in a unified buffer,
    * then all image planes will point to that buffer.
    *
    * @return the YUV image planes
    */
   public byte[][] getPlanes() throws Exception {
     if (yuvPlanes == null)
       throw new Exception(NO_ASSOC_ERROR);
     return yuvPlanes;
   }

   /**
    * Returns the YUV image buffer (if this image is stored in a unified
    * buffer rather than separate image planes.)
    *
    * @return the YUV image buffer
    */
   public byte[] getBuf() throws Exception {
     if (yuvPlanes == null || yuvSubsamp < 0 || yuvSubsamp >= TJ.NUMSAMP)
       throw new Exception(NO_ASSOC_ERROR);
     int nc = (yuvSubsamp == TJ.SAMP_GRAY ? 1 : 3);
     for (int i = 1; i < nc; i++) {
       if (yuvPlanes[i] != yuvPlanes[0])
         throw new Exception("Image is not stored in a unified buffer");
     }
     return yuvPlanes[0];
   }

   /**
    * Returns the size (in bytes) of the YUV image buffer (if this image is
    * stored in a unified buffer rather than separate image planes.)
    *
    * @return the size (in bytes) of the YUV image buffer
    */
   public int getSize() throws Exception {
     if (yuvPlanes == null || yuvSubsamp < 0 || yuvSubsamp >= TJ.NUMSAMP)
       throw new Exception(NO_ASSOC_ERROR);
     int nc = (yuvSubsamp == TJ.SAMP_GRAY ? 1 : 3);
     if (yuvPad < 1)
       throw new Exception("Image is not stored in a unified buffer");
     for (int i = 1; i < nc; i++) {
       if (yuvPlanes[i] != yuvPlanes[0])
         throw new Exception("Image is not stored in a unified buffer");
     }
     return TJ.bufSizeYUV(yuvWidth, yuvPad, yuvHeight, yuvSubsamp);
   }

   private static final int PAD(int v, int p) {
     return (v + p - 1) & (~(p - 1));
   }

   protected long handle = 0;
   protected byte[][] yuvPlanes = null;
   protected int[] yuvOffsets = null;
   protected int[] yuvStrides = null;
   protected int yuvPad = 0;
   protected int yuvWidth = 0;
   protected int yuvHeight = 0;
   protected int yuvSubsamp = -1;
 };
	/*
	* Copyright (C)2014 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;

	/**
	* This class encapsulates a YUV planar image and the metadata
	* associated with it. The TurboJPEG API allows both the JPEG compression and
	* decompression pipelines to be split into stages: YUV encode, compress from
	* YUV, decompress to YUV, and YUV decode. A <code>YUVImage</code> instance
	* serves as the destination image for YUV encode and decompress-to-YUV
	* operations and as the source image for compress-from-YUV and YUV decode
	* operations.
	* <p>
	* Technically, the JPEG format uses the YCbCr colorspace (which technically is
	* not a "colorspace" but rather a "color transform"), but per the convention
	* of the digital video community, the TurboJPEG API uses "YUV" to refer to an
	* image format consisting of Y, Cb, and Cr image planes.
	* <p>
	* Each plane is simply a 2D array of bytes, each byte representing the value
	* of one of the components (Y, Cb, or Cr) at a particular location in the
	* image. The width and height of each plane are determined by the image
	* width, height, and level of chrominance subsampling. The luminance plane
	* width is the image width padded to the nearest multiple of the horizontal
	* subsampling factor (2 in the case of 4:2:0 and 4:2:2, 4 in the case of
	* 4:1:1, 1 in the case of 4:4:4 or grayscale.) Similarly, the luminance plane
	* height is the image height padded to the nearest multiple of the vertical
	* subsampling factor (2 in the case of 4:2:0 or 4:4:0, 1 in the case of 4:4:4
	* or grayscale.) The chrominance plane width is equal to the luminance plane
	* width divided by the horizontal subsampling factor, and the chrominance
	* plane height is equal to the luminance plane height divided by the vertical
	* subsampling factor.
	* <p>
	* For example, if the source image is 35 x 35 pixels and 4:2:2 subsampling is
	* used, then the luminance plane would be 36 x 35 bytes, and each of the
	* chrominance planes would be 18 x 35 bytes. If you specify a line padding of
	* 4 bytes on top of this, then the luminance plane would be 36 x 35 bytes, and
	* each of the chrominance planes would be 20 x 35 bytes.
	*/
	public class YUVImage {

	private static final String NO_ASSOC_ERROR =
	"No image data is associated with this instance";

	/**
	* Create a new <code>YUVImage</code> instance backed by separate image
	* planes, and allocate memory for the image planes.
	*
	* @param width width (in pixels) of the YUV image
	*
	* @param strides an array of integers, each specifying the number of bytes
	* per line in the corresponding plane of the YUV image. Setting the stride
	* for any plane to 0 is the same as setting it to the plane width (see
	* {@link YUVImage above}.) If <code>strides</code> is null, then the
	* strides for all planes will be set to their respective plane widths. When
	* using this constructor, the stride for each plane must be equal to or
	* greater than the plane width.
	*
	* @param height height (in pixels) of the YUV image
	*
	* @param subsamp the level of chrominance subsampling to be used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public YUVImage(int width, int[] strides, int height, int subsamp)
	throws Exception {
	setBuf(null, null, width, strides, height, subsamp, true);
	}

	/**
	* Create a new <code>YUVImage</code> instance backed by a unified image
	* buffer, and allocate memory for the image buffer.
	*
	* @param width width (in pixels) of the YUV image
	*
	* @param pad Each line of each plane in the YUV image buffer will be padded
	* to this number of bytes (must be a power of 2.)
	*
	* @param height height (in pixels) of the YUV image
	*
	* @param subsamp the level of chrominance subsampling to be used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public YUVImage(int width, int pad, int height, int subsamp)
	throws Exception {
	setBuf(new byte[TJ.bufSizeYUV(width, pad, height, subsamp)], width, pad,
	height, subsamp);
	}

	/**
	* Create a new <code>YUVImage</code> instance from a set of existing image
	* planes.
	*
	* @param planes an array of buffers representing the Y, U (Cb), and V (Cr)
	* image planes (or just the Y plane, if the image is grayscale.) These
	* planes can be contiguous or non-contiguous in memory. Plane
	* <code>i</code> should be at least <code>offsets[i] +
	* {@link TJ#planeSizeYUV TJ.planeSizeYUV}(i, width, strides[i], height, subsamp)</code>
	* bytes in size.
	*
	* @param offsets If this <code>YUVImage</code> instance represents a
	* subregion of a larger image, then <code>offsets[i]</code> specifies the
	* offset (in bytes) of the subregion within plane <code>i</code> of the
	* larger image. Setting this to null is the same as setting the offsets for
	* all planes to 0.
	*
	* @param width width (in pixels) of the new YUV image (or subregion)
	*
	* @param strides an array of integers, each specifying the number of bytes
	* per line in the corresponding plane of the YUV image. Setting the stride
	* for any plane to 0 is the same as setting it to the plane width (see
	* {@link YUVImage above}.) If <code>strides</code> is null, then the
	* strides for all planes will be set to their respective plane widths. You
	* can adjust the strides in order to add an arbitrary amount of line padding
	* to each plane or to specify that this <code>YUVImage</code> instance is a
	* subregion of a larger image (in which case, <code>strides[i]</code> should
	* be set to the plane width of plane <code>i</code> in the larger image.)
	*
	* @param height height (in pixels) of the new YUV image (or subregion)
	*
	* @param subsamp the level of chrominance subsampling used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public YUVImage(byte[][] planes, int[] offsets, int width, int[] strides,
	int height, int subsamp) throws Exception {
	setBuf(planes, offsets, width, strides, height, subsamp, false);
	}

	/**
	* Create a new <code>YUVImage</code> instance from an existing unified image
	* buffer.
	*
	* @param yuvImage image buffer that contains or will contain YUV planar
	* image data. Use {@link TJ#bufSizeYUV} to determine the minimum size for
	* this buffer. The Y, U (Cb), and V (Cr) image planes are stored
	* sequentially in the buffer (see {@link YUVImage above} for a description
	* of the image format.)
	*
	* @param width width (in pixels) of the YUV image
	*
	* @param pad the line padding used in the YUV image buffer. For
	* instance, if each line in each plane of the buffer is padded to the
	* nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.
	*
	* @param height height (in pixels) of the YUV image
	*
	* @param subsamp the level of chrominance subsampling used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public YUVImage(byte[] yuvImage, int width, int pad, int height,
	int subsamp) throws Exception {
	setBuf(yuvImage, width, pad, height, subsamp);
	}

	/**
	* Assign a set of image planes to this <code>YUVImage</code> instance.
	*
	* @param planes an array of buffers representing the Y, U (Cb), and V (Cr)
	* image planes (or just the Y plane, if the image is grayscale.) These
	* planes can be contiguous or non-contiguous in memory. Plane
	* <code>i</code> should be at least <code>offsets[i] +
	* {@link TJ#planeSizeYUV TJ.planeSizeYUV}(i, width, strides[i], height, subsamp)</code>
	* bytes in size.
	*
	* @param offsets If this <code>YUVImage</code> instance represents a
	* subregion of a larger image, then <code>offsets[i]</code> specifies the
	* offset (in bytes) of the subregion within plane <code>i</code> of the
	* larger image. Setting this to null is the same as setting the offsets for
	* all planes to 0.
	*
	* @param width width (in pixels) of the YUV image (or subregion)
	*
	* @param strides an array of integers, each specifying the number of bytes
	* per line in the corresponding plane of the YUV image. Setting the stride
	* for any plane to 0 is the same as setting it to the plane width (see
	* {@link YUVImage above}.) If <code>strides</code> is null, then the
	* strides for all planes will be set to their respective plane widths. You
	* can adjust the strides in order to add an arbitrary amount of line padding
	* to each plane or to specify that this <code>YUVImage</code> image is a
	* subregion of a larger image (in which case, <code>strides[i]</code> should
	* be set to the plane width of plane <code>i</code> in the larger image.)
	*
	* @param height height (in pixels) of the YUV image (or subregion)
	*
	* @param subsamp the level of chrominance subsampling used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
	int height, int subsamp) throws Exception {
	setBuf(planes, offsets, width, strides, height, subsamp, false);
	}

	private void setBuf(byte[][] planes, int[] offsets, int width, int strides[],
	int height, int subsamp, boolean alloc) throws Exception {
	if ((planes == null && !alloc) \|\| width < 1 \|\| height < 1 \|\| subsamp < 0 \|\|
	subsamp >= TJ.NUMSAMP)
	throw new Exception("Invalid argument in YUVImage::setBuf()");

	int nc = (subsamp == TJ.SAMP_GRAY ? 1 : 3);
	if (planes.length != nc \|\| (offsets != null && offsets.length != nc) \|\|
	(strides != null && strides.length != nc))
	throw new Exception("YUVImage::setBuf(): planes, offsets, or strides array is the wrong size");

	if (offsets == null)
	offsets = new int[nc];
	if (strides == null)
	strides = new int[nc];

	for (int i = 0; i < nc; i++) {
	int pw = TJ.planeWidth(i, width, subsamp);
	int ph = TJ.planeHeight(i, height, subsamp);
	int planeSize = TJ.planeSizeYUV(i, width, strides[i], height, subsamp);

	if (strides[i] == 0)
	strides[i] = pw;
	if (alloc) {
	if (strides[i] < pw)
	throw new Exception("Stride must be >= plane width when allocating a new YUV image");
	planes[i] = new byte[strides[i] * ph];
	}
	if (planes[i] == null \|\| offsets[i] < 0)
	throw new Exception("Invalid argument in YUVImage::setBuf()");
	if (strides[i] < 0 && offsets[i] - planeSize + pw < 0)
	throw new Exception("Stride for plane " + i + " would cause memory to be accessed below plane boundary");
	if (planes[i].length < offsets[i] + planeSize)
	throw new Exception("Image plane " + i + " is not large enough");
	}

	yuvPlanes = planes;
	yuvOffsets = offsets;
	yuvWidth = width;
	yuvStrides = strides;
	yuvHeight = height;
	yuvSubsamp = subsamp;
	}

	/**
	* Assign a unified image buffer to this <code>YUVImage</code> instance.
	*
	* @param yuvImage image buffer that contains or will contain YUV planar
	* image data. Use {@link TJ#bufSizeYUV} to determine the minimum size for
	* this buffer. The Y, U (Cb), and V (Cr) image planes are stored
	* sequentially in the buffer (see {@link YUVImage above} for a description
	* of the image format.)
	*
	* @param width width (in pixels) of the YUV image
	*
	* @param pad the line padding used in the YUV image buffer. For
	* instance, if each line in each plane of the buffer is padded to the
	* nearest multiple of 4 bytes, then <code>pad</code> should be set to 4.
	*
	* @param height height (in pixels) of the YUV image
	*
	* @param subsamp the level of chrominance subsampling used in the YUV
	* image (one of {@link TJ#SAMP_444 TJ.SAMP_*})
	*/
	public void setBuf(byte[] yuvImage, int width, int pad, int height,
	int subsamp) throws Exception {
	if (yuvImage == null \|\| width < 1 \|\| pad < 1 \|\| ((pad & (pad - 1)) != 0) \|\|
	height < 1 \|\| subsamp < 0 \|\| subsamp >= TJ.NUMSAMP)
	throw new Exception("Invalid argument in YUVImage::setBuf()");
	if (yuvImage.length < TJ.bufSizeYUV(width, pad, height, subsamp))
	throw new Exception("YUV image buffer is not large enough");

	int nc = (subsamp == TJ.SAMP_GRAY ? 1 : 3);
	byte[][] planes = new byte[nc][];
	int[] strides = new int[nc];
	int[] offsets = new int[nc];

	planes[0] = yuvImage;
	strides[0] = PAD(TJ.planeWidth(0, width, subsamp), pad);
	if (subsamp != TJ.SAMP_GRAY) {
	strides[1] = strides[2] = PAD(TJ.planeWidth(1, width, subsamp), pad);
	planes[1] = planes[2] = yuvImage;
	offsets[1] = offsets[0] +
	strides[0] * TJ.planeHeight(0, height, subsamp);
	offsets[2] = offsets[1] +
	strides[1] * TJ.planeHeight(1, height, subsamp);
	}

	yuvPad = pad;
	setBuf(planes, offsets, width, strides, height, subsamp);
	}

	/**
	* Returns the width of the YUV image (or subregion.)
	*
	* @return the width of the YUV image (or subregion)
	*/
	public int getWidth() throws Exception {
	if (yuvWidth < 1)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvWidth;
	}

	/**
	* Returns the height of the YUV image (or subregion.)
	*
	* @return the height of the YUV image (or subregion)
	*/
	public int getHeight() throws Exception {
	if (yuvHeight < 1)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvHeight;
	}

	/**
	* Returns the line padding used in the YUV image buffer (if this image is
	* stored in a unified buffer rather than separate image planes.)
	*
	* @return the line padding used in the YUV image buffer
	*/
	public int getPad() throws Exception {
	if (yuvPlanes == null)
	throw new Exception(NO_ASSOC_ERROR);
	if (yuvPad < 1 \|\| ((yuvPad & (yuvPad - 1)) != 0))
	throw new Exception("Image is not stored in a unified buffer");
	return yuvPad;
	}

	/**
	* Returns the number of bytes per line of each plane in the YUV image.
	*
	* @return the number of bytes per line of each plane in the YUV image
	*/
	public int[] getStrides() throws Exception {
	if (yuvStrides == null)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvStrides;
	}

	/**
	* Returns the offsets (in bytes) of each plane within the planes of a larger
	* YUV image.
	*
	* @return the offsets (in bytes) of each plane within the planes of a larger
	* YUV image
	*/
	public int[] getOffsets() throws Exception {
	if (yuvOffsets == null)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvOffsets;
	}

	/**
	* Returns the level of chrominance subsampling used in the YUV image. See
	* {@link TJ#SAMP_444 TJ.SAMP_*}.
	*
	* @return the level of chrominance subsampling used in the YUV image
	*/
	public int getSubsamp() throws Exception {
	if (yuvSubsamp < 0 \|\| yuvSubsamp >= TJ.NUMSAMP)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvSubsamp;
	}

	/**
	* Returns the YUV image planes. If the image is stored in a unified buffer,
	* then all image planes will point to that buffer.
	*
	* @return the YUV image planes
	*/
	public byte[][] getPlanes() throws Exception {
	if (yuvPlanes == null)
	throw new Exception(NO_ASSOC_ERROR);
	return yuvPlanes;
	}

	/**
	* Returns the YUV image buffer (if this image is stored in a unified
	* buffer rather than separate image planes.)
	*
	* @return the YUV image buffer
	*/
	public byte[] getBuf() throws Exception {
	if (yuvPlanes == null \|\| yuvSubsamp < 0 \|\| yuvSubsamp >= TJ.NUMSAMP)
	throw new Exception(NO_ASSOC_ERROR);
	int nc = (yuvSubsamp == TJ.SAMP_GRAY ? 1 : 3);
	for (int i = 1; i < nc; i++) {
	if (yuvPlanes[i] != yuvPlanes[0])
	throw new Exception("Image is not stored in a unified buffer");
	}
	return yuvPlanes[0];
	}

	/**
	* Returns the size (in bytes) of the YUV image buffer (if this image is
	* stored in a unified buffer rather than separate image planes.)
	*
	* @return the size (in bytes) of the YUV image buffer
	*/
	public int getSize() throws Exception {
	if (yuvPlanes == null \|\| yuvSubsamp < 0 \|\| yuvSubsamp >= TJ.NUMSAMP)
	throw new Exception(NO_ASSOC_ERROR);
	int nc = (yuvSubsamp == TJ.SAMP_GRAY ? 1 : 3);
	if (yuvPad < 1)
	throw new Exception("Image is not stored in a unified buffer");
	for (int i = 1; i < nc; i++) {
	if (yuvPlanes[i] != yuvPlanes[0])
	throw new Exception("Image is not stored in a unified buffer");
	}
	return TJ.bufSizeYUV(yuvWidth, yuvPad, yuvHeight, yuvSubsamp);
	}

	private static final int PAD(int v, int p) {
	return (v + p - 1) & (~(p - 1));
	}

	protected long handle = 0;
	protected byte[][] yuvPlanes = null;
	protected int[] yuvOffsets = null;
	protected int[] yuvStrides = null;
	protected int yuvPad = 0;
	protected int yuvWidth = 0;
	protected int yuvHeight = 0;
	protected int yuvSubsamp = -1;
	};