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<section id="vshelper4-h">
<h1>VSHelper4.h<a class="headerlink" href="#vshelper4-h" title="Permalink to this heading"></a></h1>
<section id="table-of-contents">
<h2>Table of contents<a class="headerlink" href="#table-of-contents" title="Permalink to this heading"></a></h2>
<p><a class="reference internal" href="#introduction">Introduction</a></p>
<dl>
<dt><a class="reference internal" href="#macros">Macros</a></dt><dd><p><a class="reference internal" href="#vsh-std-plugin-id">VSH_STD_PLUGIN_ID</a></p>
<p><a class="reference internal" href="#vsh-resize-plugin-id">VSH_RESIZE_PLUGIN_ID</a></p>
<p><a class="reference internal" href="#vsh-text-plugin-id">VSH_TEXT_PLUGIN_ID</a></p>
<p><a class="reference internal" href="#vs-restrict">VS_RESTRICT</a></p>
<p><a class="reference internal" href="#vsh-aligned-malloc-c">VSH_ALIGNED_MALLOC</a></p>
<p><a class="reference internal" href="#vsh-aligned-free-c">VSH_ALIGNED_FREE</a></p>
<p><a class="reference internal" href="#vsmin">VSMIN</a></p>
<p><a class="reference internal" href="#vsmax">VSMAX</a></p>
</dd>
<dt><a class="reference internal" href="#functions">Functions</a></dt><dd><p><a class="reference internal" href="#vsh-aligned-malloc-cpp">vsh_aligned_malloc</a></p>
<p><a class="reference internal" href="#vsh-aligned-free-cpp">vsh_aligned_free</a></p>
<p><a class="reference internal" href="#isconstantformat">isConstantFormat</a></p>
<p><a class="reference internal" href="#issamevideoformat">isSameVideoFormat</a></p>
<p><a class="reference internal" href="#issamevideopresetformat">isSameVideoPresetFormat</a></p>
<p><a class="reference internal" href="#issamevideoinfo">isSameVideoInfo</a></p>
<p><a class="reference internal" href="#issameaudioformat">isSameAudioFormat</a></p>
<p><a class="reference internal" href="#issameaudioinfo">isSameAudioInfo</a></p>
<p><a class="reference internal" href="#muldivrational">muldivRational</a></p>
<p><a class="reference internal" href="#addrational">addRational</a></p>
<p><a class="reference internal" href="#reducerational">reduceRational</a></p>
<p><a class="reference internal" href="#int64toints">int64ToIntS</a></p>
<p><a class="reference internal" href="#doubletofloats">doubleToFloatS</a></p>
<p><a class="reference internal" href="#bitblt">bitblt</a></p>
<p><a class="reference internal" href="#arevaliddimensions">areValidDimensions</a></p>
</dd>
</dl>
</section>
<section id="introduction">
<h2>Introduction<a class="headerlink" href="#introduction" title="Permalink to this heading"></a></h2>
<p>This is a collection of helpful macros and functions. Note that all functions (not macros)
are either prefixed with <cite>vsh_</cite> in C mode or placed in the <cite>vsh</cite> namespace for C++. This documentation
will use the C++ names for these function.</p>
</section>
<section id="macros">
<h2>Macros<a class="headerlink" href="#macros" title="Permalink to this heading"></a></h2>
<section id="vsh-std-plugin-id">
<h3>VSH_STD_PLUGIN_ID<a class="headerlink" href="#vsh-std-plugin-id" title="Permalink to this heading"></a></h3>
<p>Macro defined to the internal std plugin id provided for convenience.</p>
</section>
<section id="vsh-resize-plugin-id">
<h3>VSH_RESIZE_PLUGIN_ID<a class="headerlink" href="#vsh-resize-plugin-id" title="Permalink to this heading"></a></h3>
<p>Macro defined to the internal resizer plugin id provided for convenience.</p>
</section>
<section id="vsh-text-plugin-id">
<h3>VSH_TEXT_PLUGIN_ID<a class="headerlink" href="#vsh-text-plugin-id" title="Permalink to this heading"></a></h3>
<p>Macro defined to the internal std plugin id provided for convenience.</p>
</section>
<section id="vs-restrict">
<h3>VS_RESTRICT<a class="headerlink" href="#vs-restrict" title="Permalink to this heading"></a></h3>
<p>Attempts to provide a portable definition of the C99 <code class="docutils literal notranslate"><span class="pre">restrict</span></code> keyword,
or its C++ counterpart.</p>
</section>
<section id="vsh-aligned-malloc">
<span id="vsh-aligned-malloc-c"></span><h3>VSH_ALIGNED_MALLOC<a class="headerlink" href="#vsh-aligned-malloc" title="Permalink to this heading"></a></h3>
<p>VSH_ALIGNED_MALLOC(pptr, size, alignment)</p>
<p>Expands to _aligned_malloc() in Windows, and posix_memalign() elsewhere. Note that
the arguments are in the style of posix_memalign().</p>
<p><em>pptr</em> is a pointer to a pointer.</p>
</section>
<section id="vsh-aligned-free">
<span id="vsh-aligned-free-c"></span><h3>VSH_ALIGNED_FREE<a class="headerlink" href="#vsh-aligned-free" title="Permalink to this heading"></a></h3>
<p>VSH_ALIGNED_FREE(ptr)</p>
<p>Expands to _aligned_free() in Windows, and free() elsewhere.</p>
<p><em>ptr</em> is a pointer.</p>
</section>
<section id="vsmin">
<h3>VSMIN<a class="headerlink" href="#vsmin" title="Permalink to this heading"></a></h3>
<p>VSMIN(a, b)</p>
<p>Returns the minimum of the two numbers.</p>
</section>
<section id="vsmax">
<h3>VSMAX<a class="headerlink" href="#vsmax" title="Permalink to this heading"></a></h3>
<p>VSMAX(a, b)</p>
<p>Returns the maximum of the two numbers.</p>
</section>
</section>
<section id="functions">
<h2>Functions<a class="headerlink" href="#functions" title="Permalink to this heading"></a></h2>
<section id="vsh-aligned-malloc-cpp">
<span id="id1"></span><h3>vsh_aligned_malloc<a class="headerlink" href="#vsh-aligned-malloc-cpp" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh18vsh_aligned_mallocE6size_t6size_t">
<span id="_CPPv3N3vsh18vsh_aligned_mallocE6size_t6size_t"></span><span id="_CPPv2N3vsh18vsh_aligned_mallocE6size_t6size_t"></span><span id="vsh::vsh_aligned_malloc__s.s"></span><span class="n"><span class="pre">T</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">vsh_aligned_malloc</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">size</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">alignment</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh18vsh_aligned_mallocE6size_t6size_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>A templated aligned malloc for C++. It uses the same functions as the
<a class="reference internal" href="#vsh-aligned-malloc-c">VSH_ALIGNED_MALLOC</a> macro but is easier to use.</p>
</dd></dl>
</section>
<section id="vsh-aligned-free-cpp">
<span id="id2"></span><h3>vsh_aligned_free<a class="headerlink" href="#vsh-aligned-free-cpp" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh16vsh_aligned_freeEPv">
<span id="_CPPv3N3vsh16vsh_aligned_freeEPv"></span><span id="_CPPv2N3vsh16vsh_aligned_freeEPv"></span><span id="vsh::vsh_aligned_free__voidP"></span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">vsh_aligned_free</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">ptr</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh16vsh_aligned_freeEPv" title="Permalink to this definition"></a><br /></dt>
<dd><p>This simply uses the <a class="reference internal" href="#vsh-aligned-free-c">VSH_ALIGNED_FREE</a> macro.</p>
</dd></dl>
</section>
<section id="isconstantformat">
<h3>isConstantFormat<a class="headerlink" href="#isconstantformat" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh16isConstantFormatEPK11VSVideoInfo">
<span id="_CPPv3N3vsh16isConstantFormatEPK11VSVideoInfo"></span><span id="_CPPv2N3vsh16isConstantFormatEPK11VSVideoInfo"></span><span id="vsh::isConstantFormat__VSVideoInfoCP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isConstantFormat</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">vi</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh16isConstantFormatEPK11VSVideoInfo" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if a clip’s format and dimensions are known (and therefore constant).</p>
</dd></dl>
</section>
<section id="issamevideoformat">
<h3>isSameVideoFormat<a class="headerlink" href="#issamevideoformat" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh17isSameVideoFormatEPK11VSVideoInfoPK11VSVideoInfo">
<span id="_CPPv3N3vsh17isSameVideoFormatEPK11VSVideoInfoPK11VSVideoInfo"></span><span id="_CPPv2N3vsh17isSameVideoFormatEPK11VSVideoInfoPK11VSVideoInfo"></span><span id="vsh::isSameVideoFormat__VSVideoInfoCP.VSVideoInfoCP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isSameVideoFormat</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v1</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh17isSameVideoFormatEPK11VSVideoInfoPK11VSVideoInfo" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if two clips have the same video format. If the format is
unknown in both, it will be considered the same.</p>
</dd></dl>
</section>
<section id="issamevideopresetformat">
<h3>isSameVideoPresetFormat<a class="headerlink" href="#issamevideopresetformat" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh23isSameVideoPresetFormatEjPK13VSVideoFormatP6VSCorePK5VSAPI">
<span id="_CPPv3N3vsh23isSameVideoPresetFormatEjPK13VSVideoFormatP6VSCorePK5VSAPI"></span><span id="_CPPv2N3vsh23isSameVideoPresetFormatEjPK13VSVideoFormatP6VSCorePK5VSAPI"></span><span id="vsh::isSameVideoPresetFormat__unsigned.VSVideoFormatCP.VSCoreP.VSAPICP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isSameVideoPresetFormat</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">presetFormat</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoFormat</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v</span></span>, <span class="n"><span class="pre">VSCore</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">core</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSAPI</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">vsapi</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh23isSameVideoPresetFormatEjPK13VSVideoFormatP6VSCorePK5VSAPI" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if a clip has the same video format as the preset.</p>
</dd></dl>
</section>
<section id="issamevideoinfo">
<h3>isSameVideoInfo<a class="headerlink" href="#issamevideoinfo" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh15isSameVideoInfoEPK11VSVideoInfoPK11VSVideoInfo">
<span id="_CPPv3N3vsh15isSameVideoInfoEPK11VSVideoInfoPK11VSVideoInfo"></span><span id="_CPPv2N3vsh15isSameVideoInfoEPK11VSVideoInfoPK11VSVideoInfo"></span><span id="vsh::isSameVideoInfo__VSVideoInfoCP.VSVideoInfoCP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isSameVideoInfo</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v1</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSVideoInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh15isSameVideoInfoEPK11VSVideoInfoPK11VSVideoInfo" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if two clips have the same video format and dimensions. If the format is
unknown in both, it will be considered the same. This is also true for the
dimensions. Framerate is not taken into consideration when comparing.</p>
</dd></dl>
</section>
<section id="issameaudioformat">
<h3>isSameAudioFormat<a class="headerlink" href="#issameaudioformat" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh17isSameAudioFormatEPK11VSAudioInfoPK11VSAudioInfo">
<span id="_CPPv3N3vsh17isSameAudioFormatEPK11VSAudioInfoPK11VSAudioInfo"></span><span id="_CPPv2N3vsh17isSameAudioFormatEPK11VSAudioInfoPK11VSAudioInfo"></span><span id="vsh::isSameAudioFormat__VSAudioInfoCP.VSAudioInfoCP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isSameAudioFormat</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSAudioInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v1</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSAudioInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh17isSameAudioFormatEPK11VSAudioInfoPK11VSAudioInfo" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if two clips have the same audio format.</p>
</dd></dl>
</section>
<section id="issameaudioinfo">
<h3>isSameAudioInfo<a class="headerlink" href="#issameaudioinfo" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh15isSameAudioInfoEPK11VSAudioInfoPK11VSAudioInfo">
<span id="_CPPv3N3vsh15isSameAudioInfoEPK11VSAudioInfoPK11VSAudioInfo"></span><span id="_CPPv2N3vsh15isSameAudioInfoEPK11VSAudioInfoPK11VSAudioInfo"></span><span id="vsh::isSameAudioInfo__VSAudioInfoCP.VSAudioInfoCP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">isSameAudioInfo</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSAudioInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v1</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSAudioInfo</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">v2</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh15isSameAudioInfoEPK11VSAudioInfoPK11VSAudioInfo" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if two clips have the same audio format and samplerate.</p>
</dd></dl>
</section>
<section id="muldivrational">
<h3>muldivRational<a class="headerlink" href="#muldivrational" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh14muldivRationalEP7int64_tP7int64_t7int64_t7int64_t">
<span id="_CPPv3N3vsh14muldivRationalEP7int64_tP7int64_t7int64_t7int64_t"></span><span id="_CPPv2N3vsh14muldivRationalEP7int64_tP7int64_t7int64_t7int64_t"></span><span id="vsh::muldivRational__int64_tP.int64_tP.int64_t.int64_t"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">muldivRational</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">num</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">den</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">mul</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">div</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh14muldivRationalEP7int64_tP7int64_t7int64_t7int64_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>Multiplies two rational numbers and reduces the result, i.e.
<em>num</em>/<em>den</em> * <em>mul</em>/<em>div</em>. The result is stored in <em>num</em> and <em>den</em>.</p>
<p>The caller must ensure that <em>div</em> is not 0.</p>
</dd></dl>
</section>
<section id="reducerational">
<h3>reduceRational<a class="headerlink" href="#reducerational" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh14reduceRationalEP7int64_tP7int64_t">
<span id="_CPPv3N3vsh14reduceRationalEP7int64_tP7int64_t"></span><span id="_CPPv2N3vsh14reduceRationalEP7int64_tP7int64_t"></span><span id="vsh::reduceRational__int64_tP.int64_tP"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">reduceRational</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">num</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">den</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh14reduceRationalEP7int64_tP7int64_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>Reduces a rational number.</p>
</dd></dl>
</section>
<section id="addrational">
<h3>addRational<a class="headerlink" href="#addrational" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh11addRationalEP7int64_tP7int64_t7int64_t7int64_t">
<span id="_CPPv3N3vsh11addRationalEP7int64_tP7int64_t7int64_t7int64_t"></span><span id="_CPPv2N3vsh11addRationalEP7int64_tP7int64_t7int64_t7int64_t"></span><span id="vsh::addRational__int64_tP.int64_tP.int64_t.int64_t"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">addRational</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">num</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">den</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">addnum</span></span>, <span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">addden</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh11addRationalEP7int64_tP7int64_t7int64_t7int64_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>Adds two rational numbers and reduces the result, i.e.
<em>num</em>/<em>den</em> + <em>addnum</em>/<em>addden</em>. The result is stored in <em>num</em> and <em>den</em>.</p>
</dd></dl>
</section>
<section id="int64toints">
<h3>int64ToIntS<a class="headerlink" href="#int64toints" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh11int64ToIntSE7int64_t">
<span id="_CPPv3N3vsh11int64ToIntSE7int64_t"></span><span id="_CPPv2N3vsh11int64ToIntSE7int64_t"></span><span id="vsh::int64ToIntS__int64_t"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">int64ToIntS</span></span></span><span class="sig-paren">(</span><span class="n"><span class="pre">int64_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">i</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh11int64ToIntSE7int64_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>Converts an int64_t to int with signed saturation. It’s useful to silence
warnings when reading integer properties from a VSMap and to avoid unexpected behavior on int overflow.</p>
</dd></dl>
</section>
<section id="doubletofloats">
<h3>doubleToFloatS<a class="headerlink" href="#doubletofloats" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh14doubleToFloatSEd">
<span id="_CPPv3N3vsh14doubleToFloatSEd"></span><span id="_CPPv2N3vsh14doubleToFloatSEd"></span><span id="vsh::doubleToFloatS__double"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">doubleToFloatS</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">double</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">d</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh14doubleToFloatSEd" title="Permalink to this definition"></a><br /></dt>
<dd><p>Converts a double to float. It’s useful to silence
warnings when reading double properties from a VSMap and mostly exists to mirror <a class="reference internal" href="#int64toints">int64ToIntS</a>.</p>
</dd></dl>
</section>
<section id="bitblt">
<h3>bitblt<a class="headerlink" href="#bitblt" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh6bitbltEPviPKvi6size_t6size_t">
<span id="_CPPv3N3vsh6bitbltEPviPKvi6size_t6size_t"></span><span id="_CPPv2N3vsh6bitbltEPviPKvi6size_t6size_t"></span><span id="vsh::bitblt__voidP.i.voidCP.i.s.s"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">bitblt</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">dstp</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">dst_stride</span></span>, <span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="kt"><span class="pre">void</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">srcp</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">src_stride</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">row_size</span></span>, <span class="n"><span class="pre">size_t</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">height</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh6bitbltEPviPKvi6size_t6size_t" title="Permalink to this definition"></a><br /></dt>
<dd><p>Copies bytes from one plane to another. Basically, it is memcpy in a loop.</p>
<p><em>row_size</em> is in bytes.</p>
</dd></dl>
</section>
<section id="arevaliddimensions">
<h3>areValidDimensions<a class="headerlink" href="#arevaliddimensions" title="Permalink to this heading"></a></h3>
<dl class="cpp function">
<dt class="sig sig-object cpp" id="_CPPv4N3vsh18areValidDimensionsEPK8VSFormatii">
<span id="_CPPv3N3vsh18areValidDimensionsEPK8VSFormatii"></span><span id="_CPPv2N3vsh18areValidDimensionsEPK8VSFormatii"></span><span id="vsh::areValidDimensions__VSFormatCP.i.i"></span><span class="k"><span class="pre">static</span></span><span class="w"> </span><span class="k"><span class="pre">inline</span></span><span class="w"> </span><span class="kt"><span class="pre">bool</span></span><span class="w"> </span><span class="sig-prename descclassname"><span class="n"><span class="pre">vsh</span></span><span class="p"><span class="pre">::</span></span></span><span class="sig-name descname"><span class="n"><span class="pre">areValidDimensions</span></span></span><span class="sig-paren">(</span><span class="k"><span class="pre">const</span></span><span class="w"> </span><span class="n"><span class="pre">VSFormat</span></span><span class="w"> </span><span class="p"><span class="pre">*</span></span><span class="n sig-param"><span class="pre">fi</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">width</span></span>, <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n sig-param"><span class="pre">height</span></span><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv4N3vsh18areValidDimensionsEPK8VSFormatii" title="Permalink to this definition"></a><br /></dt>
<dd><p>Checks if the given dimensions are valid for a particular format, with regards
to chroma subsampling.</p>
</dd></dl>
</section>
</section>
</section>
</div>
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