Файл: outs/wideimage/Operation/ApplyMask.php
Строк: 78
<?php
/**
* @author Gasper Kozak
* @copyright 2007-2011
This file is part of WideImage.
WideImage is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
WideImage is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with WideImage; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
* @package Internal/Operations
**/
/**
* ApplyMask operation class
*
* @package Internal/Operations
*/
class WideImage_Operation_ApplyMask
{
/**
* Applies a mask on the copy of source image
*
* @param WideImage_Image $image
* @param WideImage_Image $mask
* @param smart_coordinate $left
* @param smart_coordinate $top
* @return WideImage_Image
*/
function execute($image, $mask, $left = 0, $top = 0)
{
$left = WideImage_Coordinate::fix($left, $image->getWidth(), $mask->getWidth());
$top = WideImage_Coordinate::fix($top, $image->getHeight(), $mask->getHeight());
$width = $image->getWidth();
$mask_width = $mask->getWidth();
$height = $image->getHeight();
$mask_height = $mask->getHeight();
$result = $image->asTrueColor();
$result->alphaBlending(false);
$result->saveAlpha(true);
$srcTransparentColor = $result->getTransparentColor();
if ($srcTransparentColor >= 0)
{
# this was here. works without.
#$trgb = $image->getColorRGB($srcTransparentColor);
#$trgb['alpha'] = 127;
#$destTransparentColor = $result->allocateColorAlpha($trgb);
#$result->setTransparentColor($destTransparentColor);
$destTransparentColor = $srcTransparentColor;
}
else
{
$destTransparentColor = $result->allocateColorAlpha(255, 255, 255, 127);
}
for ($x = 0; $x < $width; $x++)
for ($y = 0; $y < $height; $y++)
{
$mx = $x - $left;
$my = $y - $top;
if ($mx >= 0 && $mx < $mask_width && $my >= 0 && $my < $mask_height)
{
$srcColor = $image->getColorAt($x, $y);
if ($srcColor == $srcTransparentColor)
$destColor = $destTransparentColor;
else
{
$maskRGB = $mask->getRGBAt($mx, $my);
if ($maskRGB['red'] == 0)
$destColor = $destTransparentColor;
elseif ($srcColor >= 0)
{
$imageRGB = $image->getRGBAt($x, $y);
$level = ($maskRGB['red'] / 255) * (1 - $imageRGB['alpha'] / 127);
$imageRGB['alpha'] = 127 - round($level * 127);
if ($imageRGB['alpha'] == 127)
$destColor = $destTransparentColor;
else
$destColor = $result->allocateColorAlpha($imageRGB);
}
else
$destColor = $destTransparentColor;
}
$result->setColorAt($x, $y, $destColor);
}
}
return $result;
}
}