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DRC e69dd40c07 Reorganize source to make things easier to find 
- Move all libjpeg documentation, except for README.ijg, into the doc/
  subdirectory.

- Move the TurboJPEG C API documentation from doc/html/ into
  doc/turbojpeg/.

- Move all C source code and headers into a src/ subdirectory.

- Move turbojpeg-jni.c into the java/ subdirectory.

Referring to #226, there is no ideal solution to this problem.  A
semantically ideal solution would have involved placing all source code,
including the SIMD and Java source code, under src/ (or perhaps placing
C library source code under lib/ and C test program source code under
test/), all header files under include/, and all documentation under
doc/.  However:

- To me it makes more sense to have separate top-level directories for
  each language, since the SIMD extensions and the Java API are
  technically optional features.  src/ now contains only the code that
  is relevant to the core C API libraries and associated programs.
- I didn't want to bury the java/ and simd/ directories or add a level
  of depth to them, since both directories already contain source code
  that is 3-4 levels deep.
- I would prefer not to separate the header files from the C source
  code, because:
  1. It would be disruptive.  libjpeg and libjpeg-turbo have
     historically placed C source code and headers in the same
     directory, and people who are familiar with both projects (self
     included) are used to looking for the headers in the same directory
     as the C source code.
  2. In terms of how the headers are used internally in libjpeg-turbo,
     the distinction between public and private headers is a bit fuzzy.
- It didn't make sense to separate the test source code from the library
  source code, since there is not a clear distinction in some cases.
  (For instance, the IJG image I/O functions are used by cjpeg and djpeg
  as well as by the TurboJPEG API.)

This solution is minimally disruptive, since it keeps all C source code
and headers together and keeps java/ and simd/ as top-level directories.
It is a bit awkward, because java/ and simd/ technically contain source
code, even though they are not under src/.  However, other solutions
would have been more awkward for different reasons.

Closes #226
2024-01-23 17:50:35 -05:00

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<a href="#pub-attribs">Data Fields</a> </div>
<div class="headertitle"><div class="title">tjtransform Struct Reference<div class="ingroups"><a class="el" href="group___turbo_j_p_e_g.html">TurboJPEG</a></div></div></div>
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<p>Lossless transform.
<a href="structtjtransform.html#details">More...</a></p>
<p><code>#include &lt;turbojpeg.h&gt;</code></p>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-attribs" name="pub-attribs"></a>
Data Fields</h2></td></tr>
<tr class="memitem:ac324e5e442abec8a961e5bf219db12cf" id="r_ac324e5e442abec8a961e5bf219db12cf"><td class="memItemLeft" align="right" valign="top"><a class="el" href="structtjregion.html">tjregion</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structtjtransform.html#ac324e5e442abec8a961e5bf219db12cf">r</a></td></tr>
<tr class="memdesc:ac324e5e442abec8a961e5bf219db12cf"><td class="mdescLeft">&#160;</td><td class="mdescRight">Cropping region. <br /></td></tr>
<tr class="separator:ac324e5e442abec8a961e5bf219db12cf"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2525aab4ba6978a1c273f74fef50e498" id="r_a2525aab4ba6978a1c273f74fef50e498"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structtjtransform.html#a2525aab4ba6978a1c273f74fef50e498">op</a></td></tr>
<tr class="memdesc:a2525aab4ba6978a1c273f74fef50e498"><td class="mdescLeft">&#160;</td><td class="mdescRight">One of the <a class="el" href="group___turbo_j_p_e_g.html#ga2de531af4e7e6c4f124908376b354866">transform operations</a>. <br /></td></tr>
<tr class="separator:a2525aab4ba6978a1c273f74fef50e498"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ac0e74655baa4402209a21e1ae481c8f6" id="r_ac0e74655baa4402209a21e1ae481c8f6"><td class="memItemLeft" align="right" valign="top">int&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structtjtransform.html#ac0e74655baa4402209a21e1ae481c8f6">options</a></td></tr>
<tr class="memdesc:ac0e74655baa4402209a21e1ae481c8f6"><td class="mdescLeft">&#160;</td><td class="mdescRight">The bitwise OR of one of more of the <a class="el" href="group___turbo_j_p_e_g.html#gaecaaa3b7e2af812592c015d83207f010">transform options</a>. <br /></td></tr>
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<tr class="memitem:a688fe8f1a8ecc12a538d9e561cf338e3" id="r_a688fe8f1a8ecc12a538d9e561cf338e3"><td class="memItemLeft" align="right" valign="top">void *&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structtjtransform.html#a688fe8f1a8ecc12a538d9e561cf338e3">data</a></td></tr>
<tr class="memdesc:a688fe8f1a8ecc12a538d9e561cf338e3"><td class="mdescLeft">&#160;</td><td class="mdescRight">Arbitrary data that can be accessed within the body of the callback function. <br /></td></tr>
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<tr class="memitem:a0dc7697d59a7abe48afc629e96cbc1d2" id="r_a0dc7697d59a7abe48afc629e96cbc1d2"><td class="memItemLeft" align="right" valign="top">int(*&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="structtjtransform.html#a0dc7697d59a7abe48afc629e96cbc1d2">customFilter</a> )(short *coeffs, <a class="el" href="structtjregion.html">tjregion</a> arrayRegion, <a class="el" href="structtjregion.html">tjregion</a> planeRegion, int componentID, int transformID, struct <a class="el" href="structtjtransform.html">tjtransform</a> *transform)</td></tr>
<tr class="memdesc:a0dc7697d59a7abe48afc629e96cbc1d2"><td class="mdescLeft">&#160;</td><td class="mdescRight">A callback function that can be used to modify the DCT coefficients after they are losslessly transformed but before they are transcoded to a new JPEG image. <br /></td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Lossless transform. </p>
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<td class="memname">int(* tjtransform::customFilter) (short *coeffs, <a class="el" href="structtjregion.html">tjregion</a> arrayRegion, <a class="el" href="structtjregion.html">tjregion</a> planeRegion, int componentID, int transformID, struct <a class="el" href="structtjtransform.html">tjtransform</a> *transform)</td>
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<p>A callback function that can be used to modify the DCT coefficients after they are losslessly transformed but before they are transcoded to a new JPEG image. </p>
<p>This allows for custom filters or other transformations to be applied in the frequency domain.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">coeffs</td><td>pointer to an array of transformed DCT coefficients. (NOTE: this pointer is not guaranteed to be valid once the callback returns, so applications wishing to hand off the DCT coefficients to another function or library should make a copy of them within the body of the callback.)</td></tr>
<tr><td class="paramname">arrayRegion</td><td><a class="el" href="structtjregion.html" title="Cropping region.">tjregion</a> structure containing the width and height of the array pointed to by <code>coeffs</code> as well as its offset relative to the component plane. TurboJPEG implementations may choose to split each component plane into multiple DCT coefficient arrays and call the callback function once for each array.</td></tr>
<tr><td class="paramname">planeRegion</td><td><a class="el" href="structtjregion.html" title="Cropping region.">tjregion</a> structure containing the width and height of the component plane to which <code>coeffs</code> belongs</td></tr>
<tr><td class="paramname">componentID</td><td>ID number of the component plane to which <code>coeffs</code> belongs. (Y, Cb, and Cr have, respectively, ID's of 0, 1, and 2 in typical JPEG images.)</td></tr>
<tr><td class="paramname">transformID</td><td>ID number of the transformed image to which <code>coeffs</code> belongs. This is the same as the index of the transform in the <code>transforms</code> array that was passed to <a class="el" href="group___turbo_j_p_e_g.html#gaff23ba1dcabed456794b844791613920" title="Losslessly transform a JPEG image into another JPEG image.">tj3Transform()</a>.</td></tr>
<tr><td class="paramname">transform</td><td>a pointer to a <a class="el" href="structtjtransform.html" title="Lossless transform.">tjtransform</a> structure that specifies the parameters and/or cropping region for this transform</td></tr>
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<dl class="section return"><dt>Returns</dt><dd>0 if the callback was successful, or -1 if an error occurred. </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#a688fe8f1a8ecc12a538d9e561cf338e3">&#9670;&#160;</a></span>data</h2>
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<td class="memname">void* tjtransform::data</td>
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<p>Arbitrary data that can be accessed within the body of the callback function. </p>
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<a id="a2525aab4ba6978a1c273f74fef50e498" name="a2525aab4ba6978a1c273f74fef50e498"></a>
<h2 class="memtitle"><span class="permalink"><a href="#a2525aab4ba6978a1c273f74fef50e498">&#9670;&#160;</a></span>op</h2>
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<td class="memname">int tjtransform::op</td>
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<p>One of the <a class="el" href="group___turbo_j_p_e_g.html#ga2de531af4e7e6c4f124908376b354866">transform operations</a>. </p>
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<a id="ac0e74655baa4402209a21e1ae481c8f6" name="ac0e74655baa4402209a21e1ae481c8f6"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac0e74655baa4402209a21e1ae481c8f6">&#9670;&#160;</a></span>options</h2>
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<td class="memname">int tjtransform::options</td>
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<p>The bitwise OR of one of more of the <a class="el" href="group___turbo_j_p_e_g.html#gaecaaa3b7e2af812592c015d83207f010">transform options</a>. </p>
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<a id="ac324e5e442abec8a961e5bf219db12cf" name="ac324e5e442abec8a961e5bf219db12cf"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ac324e5e442abec8a961e5bf219db12cf">&#9670;&#160;</a></span>r</h2>
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<td class="memname"><a class="el" href="structtjregion.html">tjregion</a> tjtransform::r</td>
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<p>Cropping region. </p>
</div>
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<hr/>The documentation for this struct was generated from the following file:<ul>
<li><b>turbojpeg.h</b></li>
</ul>
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