ImageResponse.php

<?php
class ImageResponse extends \Nette\Object implements \Nette\Application\IResponse
{

	/** @var \Nette\Image|string */
	private $image;


	/**
	 * @param \Nette\Image|string
	 */
	public function __construct($image)
	{
		if (!$image instanceof \Nette\Image && !file_exists($image)) {
			throw new \Nette\InvalidArgumentException('Image must be Nette\Image or file path');
		}
		$this->image = $image;
	}


	/**
	 * @param \Nette\Http\IRequest
	 * @param \Nette\Http\IResponse
	 */
	public function send(\Nette\Http\IRequest $httpRequest, \Nette\Http\IResponse $httpResponse)
	{
		if ($this->image instanceof \Nette\Image) {
			$this->image->send();

			return;
		}
		$httpResponse->setContentType(\Nette\Utils\MimeTypeDetector::fromFile($this->image));
		$length = filesize($this->image);
		$handle = fopen($this->image, 'r');

		$httpResponse->setHeader('Content-Length', $length);
		while (!feof($handle)) {
			echo fread($handle, 4e6);
		}
		fclose($handle);
	}
}