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<?php
/**
* @copyright Copyright (c) 2009-2017 Ryan Demmer. All rights reserved
* @copyright Copyright (C) 2005 - 2012 Open Source Matters, Inc. All rights reserved
* @license GNU/GPL 2 or later - http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* JCE is free software. This version may have been modified pursuant
* to the GNU General Public License, and as distributed it includes or
* is derivative of works licensed under the GNU General Public License or
* other free or open source software licenses.
*
* Based on JImage library from Joomla.Platform 11.3
*/
defined('_JEXEC') or die;
/**
* Image Filter class adjust the smoothness of an image.
*/
class WFImageGDFilterThreshold extends WFImageGDFilter
{
/**
* Method to apply a filter to an image resource.
*
* @param array $options An array of options for the filter
*
* @throws InvalidArgumentException
* @throws RuntimeException
*/
public function execute(array $options = array())
{
// Verify that image filter support for PHP is available.
if (!function_exists('imagefilter')) {
throw new RuntimeException('The imagefilter function for PHP is not available.');
}
if (empty($options)) {
throw new InvalidArgumentException('No valid amount was given. Expected float.');
}
$value = (int) array_shift($options);
if ($value == 0) {
$value = 128;
}
$width = imagesx($this->handle);
$height = imagesy($this->handle);
for ($x = 0; $x < $width; ++$x) {
for ($y = 0; $y < $height; ++$y) {
$index = imagecolorat($this->handle, $x, $y);
$rgb = imagecolorsforindex($this->handle, $index);
$r = $rgb['red'];
$g = $rgb['green'];
$b = $rgb['blue'];
$a = $rgb['alpha'];
$v = round(($r + $g + $b) / 3) >= $value ? 255 : 0;
$color = imagecolorallocatealpha($this->handle, $v, $v, $v, $a);
if ($color === false) {
$color = imagecolorclosestalpha($this->handle, $v, $v, $v, $a);
}
imagesetpixel($this->handle, $x, $y, $color);
}
}
}
}