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<?php
/**
* Copyright 2007-2017 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 James Heinrich <info@silisoftware.com>
* @author Michael J. Rubinsky <mrubinsk@horde.org>
* @category Horde
* @license http://www.horde.org/licenses/lgpl21 LGPL-2.1
* @package Image
*/
/**
* Image effect for adding a drop shadow.
*
* This algorithm is from the phpThumb project available at
* http://phpthumb.sourceforge.net and all credit for this script should go to
* James Heinrich <info@silisoftware.com>. Modifications made to the code to
* fit it within the Horde framework and to adjust for our coding standards.
*
* @author James Heinrich <info@silisoftware.com>
* @author Michael J. Rubinsky <mrubinsk@horde.org>
* @category Horde
* @copyright 2007-2017 Horde LLC
* @license http://www.horde.org/licenses/lgpl21 LGPL-2.1
* @package Image
*/
class Horde_Image_Effect_Gd_DropShadow extends Horde_Image_Effect
{
/**
* Valid parameters:
*
* @TODO
*
* @var array
*/
protected $_params = array(
'distance' => 5,
'width' => 2,
'hexcolor' => '000000',
'angle' => 215,
'fade' => 10
);
/**
* Applies the effect.
*/
public function apply()
{
$distance = $this->_params['distance'];
$width = $this->_params['width'];
$hexcolor = $this->_params['hexcolor'];
$angle = $this->_params['angle'];
$fade = $this->_params['fade'];
$width_shadow = cos(deg2rad($angle)) * ($distance + $width);
$height_shadow = sin(deg2rad($angle)) * ($distance + $width);
$gdimg = $this->_image->_im;
$imgX = $this->_image->call('imageSX', array($gdimg));
$imgY = $this->_image->call('imageSY', array($gdimg));
$offset['x'] = cos(deg2rad($angle)) * ($distance + $width - 1);
$offset['y'] = sin(deg2rad($angle)) * ($distance + $width - 1);
$tempImageWidth = $imgX + abs($offset['x']);
$tempImageHeight = $imgY + abs($offset['y']);
$temp = $this->_image->create($tempImageWidth, $tempImageHeight);
$this->_image->call('imageAlphaBlending', array($temp, false));
$this->_image->call('imageSaveAlpha', array($temp, true));
$transparent1 = $this->_image->call(
'imageColorAllocateAlpha',
array($temp, 0, 0, 0, 127)
);
$this->_image->call('imageFill', array($temp, 0, 0, $transparent1));
for ($x = 0; $x < $imgX; $x++) {
for ($y = 0; $y < $imgY; $y++) {
$colorat = $this->_image->call(
'imageColorAt',
array($gdimg, $x, $y)
);
$PixelMap[$x][$y] = $this->_image->call(
'imageColorsForIndex',
array($gdimg, $colorat)
);
}
}
/* Creates the shadow */
$r = hexdec(substr($hexcolor, 0, 2));
$g = hexdec(substr($hexcolor, 2, 2));
$b = hexdec(substr($hexcolor, 4, 2));
/* Essentially masks the original image and creates the shadow */
for ($x = 0; $x < $tempImageWidth; $x++) {
for ($y = 0; $y < $tempImageHeight; $y++) {
if ((!isset($PixelMap[$x][$y]['alpha']) ||
$PixelMap[$x][$y]['alpha'] > 0) &&
isset($PixelMap[$x + $offset['x']][$y + $offset['y']]['alpha']) &&
$PixelMap[$x + $offset['x']][$y + $offset['y']]['alpha'] < 127) {
$thisColor = $this->_image->call(
'imageColorAllocateAlpha',
array(
$temp,
$r, $g, $b,
$PixelMap[$x + $offset['x']][$y + $offset['y']]['alpha']
)
);
$this->_image->call(
'imageSetPixel',
array($temp, $x, $y, $thisColor)
);
}
}
}
/* Overlays the original image */
$this->_image->call('imageAlphaBlending', array($temp, true));
for ($x = 0; $x < $imgX; $x++) {
for ($y = 0; $y < $imgY; $y++) {
if ($PixelMap[$x][$y]['alpha'] < 127) {
$thisColor = $this->_image->call(
'imageColorAllocateAlpha',
array(
$temp,
$PixelMap[$x][$y]['red'],
$PixelMap[$x][$y]['green'],
$PixelMap[$x][$y]['blue'],
$PixelMap[$x][$y]['alpha']
)
);
$this->_image->call(
'imageSetPixel',
array($temp, $x, $y, $thisColor)
);
}
}
}
$this->_image->call('imageSaveAlpha', array($gdimg, true));
$this->_image->call('imageAlphaBlending', array($gdimg, false));
// Merge the shadow and the original into the original.
$this->_image->call(
'imageCopyResampled',
array(
$gdimg, $temp,
0, 0, 0, 0,
$imgX, $imgY,
$this->_image->call('imageSX', array($temp)),
$this->_image->call('imageSY', array($temp))
)
);
$this->_image->call('imageDestroy', array($temp));
}
}
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