kc3-lang/libjpeg-turbo/doc/html/structtjregion.html
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Hash : df9dbff8
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Date : 2023-11-11T12:25:03
TurboJPEG: New param to limit virt array mem usage This corresponds to max_memory_to_use in the jpeg_memory_mgr struct in the libjpeg API, except that the TurboJPEG parameter is specified in megabytes. Because this is 2023 and computers with less than 1 MB of memory are not a thing (at least not within the scope of libjpeg-turbo support), it isn't useful to allow a limit less than 1 MB to be specified. Furthermore, because TurboJPEG parameters are signed integers, if we allowed the memory limit to be specified in bytes, then it would be impossible to specify a limit larger than 2 GB on 64-bit machines. Because max_memory_to_use is a long signed integer, effectively we can specify a limit of up to 2 petabytes on 64-bit machines if the TurboJPEG parameter is specified in megabytes. (2 PB should be enough for anybody, right?) This commit also bumps the TurboJPEG API version to 3.0.1. Since the TurboJPEG API version no longer tracks the libjpeg-turbo version, it makes sense to increment the API revision number when adding constants, to increment the minor version number when adding functions, and to increment the major version number for a complete overhaul. This commit also removes the vestigial TJ_NUMPARAM macro, which was never defined because it proved unnecessary. Partially implements #735
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doc/html/structtjregion.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.20"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>TurboJPEG: tjregion Struct Reference</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/searchdata.js"></script> <script type="text/javascript" src="search/search.js"></script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> <link href="doxygen-extra.css" rel="stylesheet" type="text/css"/> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">TurboJPEG  <span id="projectnumber">3.0.1</span> </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.20 --> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ var searchBox = new SearchBox("searchBox", "search",false,'Search'); /* @license-end */ </script> <script type="text/javascript" src="menudata.js"></script> <script type="text/javascript" src="menu.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(function() { initMenu('',true,false,'search.php','Search'); $(document).ready(function() { init_search(); }); }); /* @license-end */</script> <div id="main-nav"></div> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> </div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <iframe src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> </div><!-- top --> <div class="header"> <div class="summary"> <a href="#pub-attribs">Data Fields</a> </div> <div class="headertitle"> <div class="title">tjregion Struct Reference<div class="ingroups"><a class="el" href="group___turbo_j_p_e_g.html">TurboJPEG</a></div></div> </div> </div><!--header--> <div class="contents"> <p>Cropping region. <a href="structtjregion.html#details">More...</a></p> <p><code>#include <turbojpeg.h></code></p> <table class="memberdecls"> <tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="pub-attribs"></a> Data Fields</h2></td></tr> <tr class="memitem:a4b6a37a93997091b26a75831fa291ad9"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structtjregion.html#a4b6a37a93997091b26a75831fa291ad9">x</a></td></tr> <tr class="memdesc:a4b6a37a93997091b26a75831fa291ad9"><td class="mdescLeft"> </td><td class="mdescRight">The left boundary of the cropping region. <a href="structtjregion.html#a4b6a37a93997091b26a75831fa291ad9">More...</a><br /></td></tr> <tr class="separator:a4b6a37a93997091b26a75831fa291ad9"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:a7b3e0c24cfe87acc80e334cafdcf22c2"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structtjregion.html#a7b3e0c24cfe87acc80e334cafdcf22c2">y</a></td></tr> <tr class="memdesc:a7b3e0c24cfe87acc80e334cafdcf22c2"><td class="mdescLeft"> </td><td class="mdescRight">The upper boundary of the cropping region. <a href="structtjregion.html#a7b3e0c24cfe87acc80e334cafdcf22c2">More...</a><br /></td></tr> <tr class="separator:a7b3e0c24cfe87acc80e334cafdcf22c2"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ab6eb73ceef584fc23c8c8097926dce42"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structtjregion.html#ab6eb73ceef584fc23c8c8097926dce42">w</a></td></tr> <tr class="memdesc:ab6eb73ceef584fc23c8c8097926dce42"><td class="mdescLeft"> </td><td class="mdescRight">The width of the cropping region. <a href="structtjregion.html#ab6eb73ceef584fc23c8c8097926dce42">More...</a><br /></td></tr> <tr class="separator:ab6eb73ceef584fc23c8c8097926dce42"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:aecefc45a26f4d8b60dd4d825c1710115"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="structtjregion.html#aecefc45a26f4d8b60dd4d825c1710115">h</a></td></tr> <tr class="memdesc:aecefc45a26f4d8b60dd4d825c1710115"><td class="mdescLeft"> </td><td class="mdescRight">The height of the cropping region. <a href="structtjregion.html#aecefc45a26f4d8b60dd4d825c1710115">More...</a><br /></td></tr> <tr class="separator:aecefc45a26f4d8b60dd4d825c1710115"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <div class="textblock"><p>Cropping region. </p> </div><h2 class="groupheader">Field Documentation</h2> <a id="aecefc45a26f4d8b60dd4d825c1710115"></a> <h2 class="memtitle"><span class="permalink"><a href="#aecefc45a26f4d8b60dd4d825c1710115">◆ </a></span>h</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int tjregion::h</td> </tr> </table> </div><div class="memdoc"> <p>The height of the cropping region. </p> <p>Setting this to 0 is the equivalent of setting it to the height of the source JPEG image - y. </p> </div> </div> <a id="ab6eb73ceef584fc23c8c8097926dce42"></a> <h2 class="memtitle"><span class="permalink"><a href="#ab6eb73ceef584fc23c8c8097926dce42">◆ </a></span>w</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int tjregion::w</td> </tr> </table> </div><div class="memdoc"> <p>The width of the cropping region. </p> <p>Setting this to 0 is the equivalent of setting it to the width of the source JPEG image - x. </p> </div> </div> <a id="a4b6a37a93997091b26a75831fa291ad9"></a> <h2 class="memtitle"><span class="permalink"><a href="#a4b6a37a93997091b26a75831fa291ad9">◆ </a></span>x</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int tjregion::x</td> </tr> </table> </div><div class="memdoc"> <p>The left boundary of the cropping region. </p> <p>This must be evenly divisible by the MCU block width (see <a class="el" href="group___turbo_j_p_e_g.html#ga9e61e7cd47a15a173283ba94e781308c" title="MCU block width (in pixels) for a given level of chrominance subsampling.">tjMCUWidth</a>.) </p> </div> </div> <a id="a7b3e0c24cfe87acc80e334cafdcf22c2"></a> <h2 class="memtitle"><span class="permalink"><a href="#a7b3e0c24cfe87acc80e334cafdcf22c2">◆ </a></span>y</h2> <div class="memitem"> <div class="memproto"> <table class="memname"> <tr> <td class="memname">int tjregion::y</td> </tr> </table> </div><div class="memdoc"> <p>The upper boundary of the cropping region. </p> <p>For lossless transformation, this must be evenly divisible by the MCU block height (see <a class="el" href="group___turbo_j_p_e_g.html#gabd247bb9fecb393eca57366feb8327bf" title="MCU block height (in pixels) for a given level of chrominance subsampling.">tjMCUHeight</a>.) </p> </div> </div> <hr/>The documentation for this struct was generated from the following file:<ul> <li>turbojpeg.h</li> </ul> </div><!-- contents --> <!-- start 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