Neos\Media\Domain\Model\ThumbnailGenerator\IconThumbnailGenerator::refresh PHP Method

    public function refresh(Thumbnail $thumbnail)
    {
        try {
            $width = $thumbnail->getConfigurationValue('width') ?: $thumbnail->getConfigurationValue('maximumWidth');
            $height = $thumbnail->getConfigurationValue('height') ?: $thumbnail->getConfigurationValue('maximumHeight');
            /** @var AssetInterface $asset */
            $asset = $thumbnail->getOriginalAsset();
            $icon = FileTypeIconService::getIcon($asset, $width, $height);
            $thumbnail->setStaticResource($icon['src']);
            $thumbnail->setWidth($icon['width']);
            $thumbnail->setHeight($icon['height']);
        } catch (\Exception $exception) {
            $message = sprintf('Unable to generate thumbnail for the given image (filename: %s, SHA1: %s)', $thumbnail->getOriginalAsset()->getResource()->getFilename(), $thumbnail->getOriginalAsset()->getResource()->getSha1());
            throw new Exception\NoThumbnailAvailableException($message, 1433109654, $exception);
        }
    }