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<?php
/**
* Copyright 2017 Horde LLC (http://www.horde.org/)
*
* See the enclosed file LICENSE for license information (LGPL). If you
* did not receive this file, see http://www.horde.org/licenses/lgpl21.
*
* @author Philip Ronan
* @author Martijn Frazer <martijn@martijnfrazer.nl>
* @author Jan Schneider <jan@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/lgpl21 LGPL-2.1
* @package Image
*/
/**
* Blur image effect.
*
* Original version from Martijn Frazer based on
* https://stackoverflow.com/a/20264482
*
* @author Philip Ronan
* @author Martijn Frazer <martijn@martijnfrazer.nl>
* @author Jan Schneider <jan@horde.org>
* @category Horde
* @copyright 2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL-2.1
* @package Image
*/
class Horde_Image_Effect_Gd_Blur extends Horde_Image_Effect
{
/**
* Valid parameters:
* - factor: (integer) Blur strength.
*
* @var array
*/
protected $_params = array(
'factor' => 3,
);
/**
* Applies the effect.
*/
public function apply()
{
// Blur factor has to be an integer.
$blurFactor = round($this->_params['factor']);
$img = $this->_image->_im;
$originalWidth = imagesx($img);
$originalHeight = imagesy($img);
$smallestWidth = ceil($originalWidth * pow(0.5, $blurFactor));
$smallestHeight = ceil($originalHeight * pow(0.5, $blurFactor));
// For the first run, the previous image is the original input.
$prevImage = $img;
$prevWidth = $originalWidth;
$prevHeight = $originalHeight;
// Scale way down and gradually scale back up, blurring all the way.
for ($i = 0; $i < $blurFactor; $i++) {
// Determine dimensions of next image.
$nextWidth = $smallestWidth * pow(2, $i);
$nextHeight = $smallestHeight * pow(2, $i);
// Resize previous image to next size.
$nextImage = imagecreatetruecolor($nextWidth, $nextHeight);
imagecopyresized(
$nextImage, $prevImage,
0, 0, 0, 0,
$nextWidth, $nextHeight, $prevWidth, $prevHeight
);
// Apply blur filter.
imagefilter($nextImage, IMG_FILTER_GAUSSIAN_BLUR);
// Now the new image becomes the previous image for the next step.
$prevImage = $nextImage;
$prevWidth = $nextWidth;
$prevHeight = $nextHeight;
}
// Scale back to original size and blur one more time
imagecopyresized(
$img, $nextImage,
0, 0, 0, 0,
$originalWidth, $originalHeight, $nextWidth, $nextHeight
);
imagefilter($img, IMG_FILTER_GAUSSIAN_BLUR);
// Clean up
imagedestroy($prevImage);
}
}
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