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<h4>This Page</h4>
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<h1><i class="glyphicon glyphicon-cog"></i> <code class="mod">lektor.imagetools.</code><code class="obj">process_image</code> <span class="sig">(<code>ctx, source_image, dst_filename, width=None, height=None, mode=ThumbnailMode.DEFAULT</code>)</span></h1>
<ul class=page-meta>
<li>New in Lektor Version <em>2.0</em></li>
</ul>
<p>This function takes a <a href="../../build/context/" class="ref">Context</a> object, the
absolute paths to the image's source and target files, the target image's
width and/or height, and the operation mode.
In the default mode, if width or height are <code>None</code>, they are calculated
from the source image's dimensions so that the image is scaled proportionally.</p>
<p>Used internally for the implementation of <a href="../../db/record/thumbnail" class="ref">thumbnail</a>, and exposed as an API for image-processing plugins.</p>
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<h2 id="example">Example</h2><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">lektor.build_programs</span> <span class="kn">import</span> <span class="n">AttachmentBuildProgram</span>
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<span class="kn">from</span> <span class="nn">lektor.context</span> <span class="kn">import</span> <span class="n">get_ctx</span>
<span class="kn">from</span> <span class="nn">lektor.db</span> <span class="kn">import</span> <span class="n">Image</span>
<span class="kn">from</span> <span class="nn">lektor.imagetools</span> <span class="kn">import</span> <span class="n">process_image</span><span class="p">,</span> <span class="n">ThumbnailMode</span>
<span class="kn">from</span> <span class="nn">lektor.pluginsystem</span> <span class="kn">import</span> <span class="n">Plugin</span>
<span class="k">class</span> <span class="nc">ImageCropBuildProgram</span><span class="p">(</span><span class="n">AttachmentBuildProgram</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">build_artifact</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">artifact</span><span class="p">):</span>
<span class="n">ctx</span> <span class="o">=</span> <span class="n">get_ctx</span><span class="p">()</span>
<span class="n">width</span><span class="p">,</span> <span class="n">height</span> <span class="o">=</span> <span class="mi">600</span><span class="p">,</span> <span class="mi">400</span>
<span class="n">source_img</span> <span class="o">=</span> <span class="n">artifact</span><span class="o">.</span><span class="n">source_obj</span><span class="o">.</span><span class="n">attachment_filename</span>
<span class="n">artifact</span><span class="o">.</span><span class="n">ensure_dir</span><span class="p">()</span>
<span class="n">process_image</span><span class="p">(</span><span class="n">ctx</span><span class="p">,</span>
<span class="n">source_img</span><span class="p">,</span>
<span class="n">artifact</span><span class="o">.</span><span class="n">dst_filename</span><span class="p">,</span>
<span class="n">width</span><span class="p">,</span> <span class="n">height</span><span class="p">,</span> <span class="n">mode</span><span class="o">=</span><span class="n">ThumbnailMode</span><span class="o">.</span><span class="n">CROP</span><span class="p">)</span>
<span class="k">class</span> <span class="nc">ImageCropPlugin</span><span class="p">(</span><span class="n">Plugin</span><span class="p">):</span>
<span class="k">def</span> <span class="nf">on_setup_env</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">**</span><span class="n">extra</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">env</span><span class="o">.</span><span class="n">add_build_program</span><span class="p">(</span><span class="n">Image</span><span class="p">,</span> <span class="n">ImageCropBuildProgram</span><span class="p">)</span>
</pre></div>
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