FluidTYPO3\Vhs\ViewHelpers\Media\PdfThumbnailViewHelper::render PHP Метод

    public function render()
    {
        $src = GeneralUtility::getFileAbsFileName($this->arguments['src']);
        if (false === file_exists($src)) {
            return null;
        }
        $density = $this->arguments['density'];
        $rotate = $this->arguments['rotate'];
        $page = (int) $this->arguments['page'];
        $background = $this->arguments['background'];
        $forceOverwrite = (bool) $this->arguments['forceOverwrite'];
        $filename = basename($src);
        $pageArgument = $page > 0 ? $page - 1 : 0;
        if (isset($GLOBALS['TYPO3_CONF_VARS']['GFX']['colorspace'])) {
            $colorspace = $GLOBALS['TYPO3_CONF_VARS']['GFX']['colorspace'];
        } else {
            $colorspace = 'RGB';
        }
        $path = GeneralUtility::getFileAbsFileName('typo3temp/vhs-pdf-' . $filename . '-page' . $page . '.png');
        if (false === file_exists($path) || true === $forceOverwrite) {
            $arguments = '-colorspace ' . $colorspace;
            if (0 < (int) $density) {
                $arguments .= ' -density ' . $density;
            }
            if (0 !== (int) $rotate) {
                $arguments .= ' -rotate ' . $rotate;
            }
            $arguments .= ' "' . $src . '"[' . $pageArgument . ']';
            if (null !== $background) {
                $arguments .= ' -background "' . $background . '" -flatten';
            }
            $arguments .= ' "' . $path . '"';
            $command = CommandUtility::imageMagickCommand('convert', $arguments);
            CommandUtility::exec($command);
        }
        $this->preprocessImage($path);
        return $this->renderTag();
    }