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DRC 9a146f0f23 TurboJPEG: Numerous documentation improvements 
- Wordsmithing, formatting, and grammar tweaks

- Various clarifications and corrections, including specifying whether
  a particular buffer or image is used as a source or destination

- Accommodate/mention features that were introduced since the API
  documentation was created.

- For clarity, use "packed-pixel" to describe uncompressed
  source/destination images that are not planar YUV.

- Use "row" rather than "line" to refer to a single horizontal group of
  pixels or component values, for consistency with the libjpeg API
  documentation.  (libjpeg also uses "scanline", which is a more archaic
  term.)

- Use "alignment" rather than "padding" to refer to the number of bytes
  by which a row's width is evenly divisible.  This consistifies the
  documention of the YUV functions and tjLoadImage().  ("Padding"
  typically refers to the number of bytes added to each row, which is
  not the same thing.)

- Remove all references to "the underlying codec."  Although the
  TurboJPEG API originated as a cross-platform wrapper for the Intel
  Integrated Performance Primitives, Sun mediaLib, QuickTime, and
  libjpeg, none of those TurboJPEG implementations has been maintained
  since 2009.  Nothing would prevent someone from implementing the
  TurboJPEG API without libjpeg-turbo, but such an implementation would
  not necessarily have an "underlying codec."  (It could be fully
  self-contained.)

- Use "destination image" rather than "output image", for consistency,
  or describe the type of image that will be output.

- Avoid the term "image buffer" and instead use "byte buffer" to
  refer to buffers that will hold JPEG images, or describe the type of
  image that will be contained in the buffer.  (The Java documentation
  doesn't use "byte buffer", because the buffer arrays literally have
  "byte" in front of them, and since Java doesn't have pointers, it is
  not possible for mere mortals to store any other type of data in those
  arrays.)

- C: Use "unified" to describe YUV images stored in a single buffer, for
  consistency with the Java documentation.

- Use "planar YUV" rather than "YUV planar".  Is is our convention to
  describe images using {component layout} {colorspace/pixel format}
  {image function}, e.g. "packed-pixel RGB source image" or "planar YUV
  destination image."

- C: Document the TurboJPEG API version in which a particular function
  or macro was introduced, and reorder the backward compatibility
  function stubs in turbojpeg.h alphabetically by API version.

- C: Use Markdown rather than HTML tags, where possible, in the Doxygen
  comments.
2023-01-14 17:10:31 -06:00

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<div class="subTitle">org.libjpegturbo.turbojpeg</div>
<h2 title="Class TJTransformer" class="title">Class TJTransformer</h2>
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<ul class="inheritance">
<li>java.lang.Object</li>
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<ul class="inheritance">
<li><a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">org.libjpegturbo.turbojpeg.TJDecompressor</a></li>
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<pre>public class <span class="strong">TJTransformer</span>
extends <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a></pre>
<div class="block">TurboJPEG lossless transformer</div>
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<h3>Fields inherited from class&nbsp;org.libjpegturbo.turbojpeg.<a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a></h3>
<code><a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#handle">handle</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegBuf">jpegBuf</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegBufSize">jpegBufSize</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegColorspace">jpegColorspace</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegHeight">jpegHeight</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegSubsamp">jpegSubsamp</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#jpegWidth">jpegWidth</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#yuvImage">yuvImage</a></code></li>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#TJTransformer()">TJTransformer</a></strong>()</code>
<div class="block">Create a TurboJPEG lossless transformer instance.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#TJTransformer(byte[])">TJTransformer</a></strong>(byte[]&nbsp;jpegImage)</code>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image stored in <code>jpegImage</code> with the newly created
instance.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#TJTransformer(byte[],%20int)">TJTransformer</a></strong>(byte[]&nbsp;jpegImage,
int&nbsp;imageSize)</code>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image of length <code>imageSize</code> bytes stored in
<code>jpegImage</code> with the newly created instance.</div>
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<td class="colFirst"><code>int[]</code></td>
<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#getTransformedSizes()">getTransformedSizes</a></strong>()</code>
<div class="block">Returns an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#transform(byte[][],%20org.libjpegturbo.turbojpeg.TJTransform[],%20int)">transform</a></strong>(byte[][]&nbsp;dstBufs,
<a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)</code>
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance into one or more JPEG images stored in the given
destination buffers.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code><a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]</code></td>
<td class="colLast"><code><strong><a href="../../../org/libjpegturbo/turbojpeg/TJTransformer.html#transform(org.libjpegturbo.turbojpeg.TJTransform[],%20int)">transform</a></strong>(<a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)</code>
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance and return an array of <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a>
instances, each of which has a transformed JPEG image associated with it.</div>
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<h3>Methods inherited from class&nbsp;org.libjpegturbo.turbojpeg.<a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a></h3>
<code><a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#close()">close</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(java.awt.image.BufferedImage,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(byte[],%20int,%20int,%20int,%20int,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(byte[],%20int,%20int,%20int,%20int,%20int,%20int,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(int[],%20int,%20int,%20int,%20int,%20int,%20int,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(int,%20int,%20int,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompress(int,%20int,%20int,%20int,%20int)">decompress</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompressToYUV(byte[],%20int)">decompressToYUV</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompressToYUV(int)">decompressToYUV</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompressToYUV(int,%20int[],%20int,%20int)">decompressToYUV</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompressToYUV(int,%20int,%20int,%20int)">decompressToYUV</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#decompressToYUV(org.libjpegturbo.turbojpeg.YUVImage,%20int)">decompressToYUV</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#finalize()">finalize</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getColorspace()">getColorspace</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getHeight()">getHeight</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getJPEGBuf()">getJPEGBuf</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getJPEGSize()">getJPEGSize</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getScaledHeight(int,%20int)">getScaledHeight</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getScaledWidth(int,%20int)">getScaledWidth</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getSubsamp()">getSubsamp</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#getWidth()">getWidth</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#setJPEGImage(byte[],%20int)">setJPEGImage</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#setSourceImage(byte[],%20int)">setSourceImage</a>, <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html#setSourceImage(org.libjpegturbo.turbojpeg.YUVImage)">setSourceImage</a></code></li>
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<h3>Methods inherited from class&nbsp;java.lang.Object</h3>
<code>clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</code></li>
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<h4>TJTransformer</h4>
<pre>public&nbsp;TJTransformer()
throws <a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance.</div>
<dl><dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd></dl>
</li>
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<pre>public&nbsp;TJTransformer(byte[]&nbsp;jpegImage)
throws <a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image stored in <code>jpegImage</code> with the newly created
instance.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>jpegImage</code> - buffer containing the JPEG source image to transform.
(The size of the JPEG image is assumed to be the length of the array.)
This buffer is not modified.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd></dl>
</li>
</ul>
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<h4>TJTransformer</h4>
<pre>public&nbsp;TJTransformer(byte[]&nbsp;jpegImage,
int&nbsp;imageSize)
throws <a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Create a TurboJPEG lossless transformer instance and associate the JPEG
source image of length <code>imageSize</code> bytes stored in
<code>jpegImage</code> with the newly created instance.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>jpegImage</code> - buffer containing the JPEG source image to transform.
This buffer is not modified.</dd><dd><code>imageSize</code> - size of the JPEG source image (in bytes)</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd></dl>
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<h4>transform</h4>
<pre>public&nbsp;void&nbsp;transform(byte[][]&nbsp;dstBufs,
<a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)
throws <a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Losslessly transform the JPEG source 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.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dstBufs</code> - an array of JPEG destination buffers.
<code>dstbufs[i]</code> will receive a JPEG image that has been
transformed using the parameters in <code>transforms[i]</code>. Use
<a href="../../../org/libjpegturbo/turbojpeg/TJ.html#bufSize(int,%20int,%20int)"><code>TJ.bufSize(int, int, int)</code></a> 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.</dd><dd><code>transforms</code> - an array of <a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg"><code>TJTransform</code></a> instances, each of
which specifies the transform parameters and/or cropping region for the
corresponding transformed JPEG image</dd><dd><code>flags</code> - the bitwise OR of one or more of
<a href="../../../org/libjpegturbo/turbojpeg/TJ.html#FLAG_BOTTOMUP"><code>TJ.FLAG_*</code></a></dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd></dl>
</li>
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<h4>transform</h4>
<pre>public&nbsp;<a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg">TJDecompressor</a>[]&nbsp;transform(<a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg">TJTransform</a>[]&nbsp;transforms,
int&nbsp;flags)
throws <a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></pre>
<div class="block">Losslessly transform the JPEG source image associated with this
transformer instance and return an array of <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a>
instances, each of which has a transformed JPEG image associated with it.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>transforms</code> - an array of <a href="../../../org/libjpegturbo/turbojpeg/TJTransform.html" title="class in org.libjpegturbo.turbojpeg"><code>TJTransform</code></a> instances, each of
which specifies the transform parameters and/or cropping region for the
corresponding transformed JPEG image</dd><dd><code>flags</code> - the bitwise OR of one or more of
<a href="../../../org/libjpegturbo/turbojpeg/TJ.html#FLAG_BOTTOMUP"><code>TJ.FLAG_*</code></a></dd>
<dt><span class="strong">Returns:</span></dt><dd>an array of <a href="../../../org/libjpegturbo/turbojpeg/TJDecompressor.html" title="class in org.libjpegturbo.turbojpeg"><code>TJDecompressor</code></a> instances, each of
which has a transformed JPEG image associated with it.</dd>
<dt><span class="strong">Throws:</span></dt>
<dd><code><a href="../../../org/libjpegturbo/turbojpeg/TJException.html" title="class in org.libjpegturbo.turbojpeg">TJException</a></code></dd></dl>
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<h4>getTransformedSizes</h4>
<pre>public&nbsp;int[]&nbsp;getTransformedSizes()</pre>
<div class="block">Returns an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</div>
<dl><dt><span class="strong">Returns:</span></dt><dd>an array containing the sizes of the transformed JPEG images
(in bytes) generated by the most recent transform operation.</dd></dl>
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