class.ilRendererFactory.php

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<?php
final class ilRendererFactory
{
    private array $renderers = [];

    public function __construct(array $additional_renderers = [])
    {
        $base_renderers = [
            new ilImageMagickRenderer(),
            new ilGhostscriptRenderer()
        ];
        $this->renderers = array_merge($additional_renderers, $base_renderers);
    }

    public function getRenderers(): array
    {
        return $this->renderers;
    }

    public function getRenderer(\ilPreview $preview): ?ilPreviewRenderer
    {
        // check each renderer if it supports that preview object
        foreach ($this->getRenderers() as $renderer) {
            if ($renderer->supports($preview)) {
                return $renderer;
            }
        }

        // no matching renderer was found
        return null;
    }
}