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  <div class="section" id="naming-conventions">
<h1>Naming Conventions</h1>
<p>Description of established naming conventions used in source code of GIL,
tests and examples.</p>
<div class="section" id="concrete-types">
<h2>Concrete Types</h2>
<p>Concrete (non-generic) GIL types follow this naming convention:</p>
<div class="highlight-c++"><div class="highlight"><pre><span class="n">ColorSpace</span> <span class="o">+</span> <span class="n">BitDepth</span> <span class="o">+</span> <span class="p">[</span><span class="n">f</span> <span class="o">|</span> <span class="n">s</span><span class="p">]</span><span class="o">+</span> <span class="p">[</span><span class="n">c</span><span class="p">]</span> <span class="o">+</span> <span class="p">[</span><span class="n">_planar</span><span class="p">]</span> <span class="o">+</span> <span class="p">[</span><span class="n">_step</span><span class="p">]</span> <span class="o">+</span> <span class="n">ClassType</span> <span class="o">+</span> <span class="n">_t</span>
</pre></div>
</div>
<p>where:</p>
<ul class="simple">
<li><code class="docutils literal"><span class="pre">ColorSpace</span></code> indicates layout and ordering of components.
For example, <code class="docutils literal"><span class="pre">rgb</span></code>, <code class="docutils literal"><span class="pre">bgr</span></code>, <code class="docutils literal"><span class="pre">cmyk</span></code>, <code class="docutils literal"><span class="pre">rgba</span></code>.</li>
<li><code class="docutils literal"><span class="pre">BitDepth</span></code> indicates the bit depth of the color channel.
For example, <code class="docutils literal"><span class="pre">8</span></code>,``16``,``32``.</li>
<li>By default, type of channel is unsigned integral.
The <code class="docutils literal"><span class="pre">s</span></code> tag indicates signed integral.
The <code class="docutils literal"><span class="pre">f</span></code> tag indicates a floating point type, which is always signed.</li>
<li>By default, objects operate on mutable pixels.
The <code class="docutils literal"><span class="pre">c</span></code> tag indicates object operating over immutable pixels.</li>
<li><code class="docutils literal"><span class="pre">_planar</span></code> indicates planar organization (as opposed to interleaved).</li>
<li><code class="docutils literal"><span class="pre">_step</span></code> indicates special image views, locators and iterators which
traverse the data in non-trivial way. For example, backwards or every other
pixel.</li>
<li><code class="docutils literal"><span class="pre">ClassType</span></code> is <code class="docutils literal"><span class="pre">_image</span></code> (image), <code class="docutils literal"><span class="pre">_view</span></code> (image view), <code class="docutils literal"><span class="pre">_loc</span></code> (pixel
2D locator) <code class="docutils literal"><span class="pre">_ptr</span></code> (pixel iterator), <code class="docutils literal"><span class="pre">_ref</span></code> (pixel reference),
<code class="docutils literal"><span class="pre">_pixel</span></code> (pixel value).</li>
<li><code class="docutils literal"><span class="pre">_t</span></code> suffix indicaes it is a name of a type.</li>
</ul>
<p>For example:</p>
<div class="highlight-cpp"><div class="highlight"><pre><span class="n">bgr8_image_t</span>             <span class="n">a</span><span class="p">;</span>    <span class="c1">// 8-bit interleaved BGR image</span>
<span class="n">cmyk16_pixel_t</span>           <span class="n">b</span><span class="p">;</span>    <span class="c1">// 16-bit CMYK pixel value;</span>
<span class="n">cmyk16c_planar_ref_t</span>     <span class="nf">c</span><span class="p">(</span><span class="n">b</span><span class="p">);</span> <span class="c1">// const reference to a 16-bit planar CMYK pixel.</span>
<span class="n">rgb32f_planar_step_ptr_t</span> <span class="n">d</span><span class="p">;</span>    <span class="c1">// step pointer to a 32-bit planar RGB pixel.</span>
</pre></div>
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