Обновление TCPDF библиотеки в Joomla 1.5.26 - Joomla 1.5: Настройка и оптимизация

[Sun May 14 02:57:57.224940 2017] [:error] [pid 18644] [client 95.108.179.7:34474] 
PHP Warning:  imagecolorat() expects parameter 1 to be resource, boolean given in /мой сайт/public_html/libraries/tcpdf/tcpdf.php on line 7293

$color = imagecolorat($img, $xpx, $ypx);

/**
	 * Extract info from a PNG image with alpha channel using the Imagick or GD library.
	 * @param $file (string) Name of the file containing the image.
	 * @param $x (float) Abscissa of the upper-left corner.
	 * @param $y (float) Ordinate of the upper-left corner.
	 * @param $wpx (float) Original width of the image in pixels.
	 * @param $hpx (float) original height of the image in pixels.
	 * @param $w (float) Width of the image in the page. If not specified or equal to zero, it is automatically calculated.
	 * @param $h (float) Height of the image in the page. If not specified or equal to zero, it is automatically calculated.
	 * @param $type (string) Image format. Possible values are (case insensitive): JPEG and PNG (whitout GD library) and all images supported by GD: GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM;. If not specified, the type is inferred from the file extension.
	 * @param $link (mixed) URL or identifier returned by AddLink().
	 * @param $align (string) Indicates the alignment of the pointer next to image insertion relative to image height. The value can be:<ul><li>T: top-right for LTR or top-left for RTL</li><li>M: middle-right for LTR or middle-left for RTL</li><li>B: bottom-right for LTR or bottom-left for RTL</li><li>N: next line</li></ul>
	 * @param $resize (boolean) If true resize (reduce) the image to fit $w and $h (requires GD library).
	 * @param $dpi (int) dot-per-inch resolution used on resize
	 * @param $palign (string) Allows to center or align the image on the current line. Possible values are:<ul><li>L : left align</li><li>C : center</li><li>R : right align</li><li>'' : empty string : left for LTR or right for RTL</li></ul>
	 * @param $filehash (string) File hash used to build unique file names.
	 * @author Nicola Asuni
	 * @protected
	 * @since 4.3.007 (2008-12-04)
	 * @see Image()
	 */
	protected function ImagePngAlpha($file, $x, $y, $wpx, $hpx, $w, $h, $type, $link, $align, $resize, $dpi, $palign, $filehash='') {
		// create temp images
		if (empty($filehash)) {
			$filehash = md5($file);
		}
		// create temp image file (without alpha channel)
		$tempfile_plain = K_PATH_CACHE.'__tcpdf_'.$this->file_id.'_imgmask_plain_'.$filehash;
		// create temp alpha file
		$tempfile_alpha = K_PATH_CACHE.'__tcpdf_'.$this->file_id.'_imgmask_alpha_'.$filehash;
		$parsed = false;
		$parse_error = '';
		// ImageMagick extension
		if (($parsed === false) AND extension_loaded('imagick')) {
			try {
				// ImageMagick library
				$img = new Imagick();
				$img->readImage($file);
				// clone image object
				$imga = TCPDF_STATIC::objclone($img);
				// extract alpha channel
				if (method_exists($img, 'setImageAlphaChannel') AND defined('Imagick::ALPHACHANNEL_EXTRACT')) {
					$img->setImageAlphaChannel(Imagick::ALPHACHANNEL_EXTRACT);
				} else {
					$img->separateImageChannel(8); // 8 = (imagick::CHANNEL_ALPHA | imagick::CHANNEL_OPACITY | imagick::CHANNEL_MATTE);
					$img->negateImage(true);
				}
				$img->setImageFormat('png');
				$img->writeImage($tempfile_alpha);
				// remove alpha channel
				if (method_exists($imga, 'setImageMatte')) {
					$imga->setImageMatte(false);
				} else {
					$imga->separateImageChannel(39); // 39 = (imagick::CHANNEL_ALL & ~(imagick::CHANNEL_ALPHA | imagick::CHANNEL_OPACITY | imagick::CHANNEL_MATTE));
				}
				$imga->setImageFormat('png');
				$imga->writeImage($tempfile_plain);
				$parsed = true;
			} catch (Exception $e) {
				// Imagemagick fails, try with GD
				$parse_error = 'Imagick library error: '.$e->getMessage();
			}
		}
		// GD extension
		if (($parsed === false) AND function_exists('imagecreatefrompng')) {
			try {
				// generate images
				$img = imagecreatefrompng($file);
				$imgalpha = imagecreate($wpx, $hpx);
				// generate gray scale palette (0 -> 255)
				for ($c = 0; $c < 256; ++$c) {
					ImageColorAllocate($imgalpha, $c, $c, $c);
				}
				// extract alpha channel
				for ($xpx = 0; $xpx < $wpx; ++$xpx) {
					for ($ypx = 0; $ypx < $hpx; ++$ypx) {
						$color = imagecolorat($img, $xpx, $ypx);
						// get and correct gamma color
						$alpha = $this->getGDgamma($img, $color);
						imagesetpixel($imgalpha, $xpx, $ypx, $alpha);
					}
				}
				imagepng($imgalpha, $tempfile_alpha);
				imagedestroy($imgalpha);
				// extract image without alpha channel
				$imgplain = imagecreatetruecolor($wpx, $hpx);
				imagecopy($imgplain, $img, 0, 0, 0, 0, $wpx, $hpx);
				imagepng($imgplain, $tempfile_plain);
				imagedestroy($imgplain);
				$parsed = true;
			} catch (Exception $e) {
				// GD fails
				$parse_error = 'GD library error: '.$e->getMessage();
			}
		}
		if ($parsed === false) {
			if (empty($parse_error)) {
				$this->Error('TCPDF requires the Imagick or GD extension to handle PNG images with alpha channel.');
			} else {
				$this->Error($parse_error);
			}
		}
		// embed mask image
		$imgmask = $this->Image($tempfile_alpha, $x, $y, $w, $h, 'PNG', '', '', $resize, $dpi, '', true, false);
		// embed image, masked with previously embedded mask
		$this->Image($tempfile_plain, $x, $y, $w, $h, $type, $link, $align, $resize, $dpi, $palign, false, $imgmask);
	}

    if($img){
				// extract alpha channel
				for ($xpx = 0; $xpx < $wpx; ++$xpx) {
					for ($ypx = 0; $ypx < $hpx; ++$ypx) {
						$color = imagecolorat($img, $xpx, $ypx);
						// get and correct gamma color
						$alpha = $this->getGDgamma($img, $color);
						imagesetpixel($imgalpha, $xpx, $ypx, $alpha);
					}
				}
}