x5 Gaussian kernel</strong>
to blur the input surface. The first pass applies the blur horizontally, and the
second pass applies the blur vertically. For pixels outside the image boundaries,
the function assigns the nearest edge value to reduce visual artifacts.</p>
<div class="math notranslate nohighlight">
\[\text{Horizontal pass: }
\begin{bmatrix}
\frac{1}{16} &amp; \frac{4}{16} &amp; \frac{6}{16} &amp; \frac{4}{16} &amp; \frac{1}{16}
\end{bmatrix}\]</div>
<div class="math notranslate nohighligh