64 lines
2.0 KiB
PHP
64 lines
2.0 KiB
PHP
<?php
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/**
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* @author Gasper Kozak
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* @copyright 2007-2011
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This file is part of WideImage.
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WideImage is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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WideImage is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with WideImage; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* @package Internal/Operations
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**/
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/**
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* AsNegative operation class
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*
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* @package Internal/Operations
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*/
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class WideImage_Operation_AsNegative
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{
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/**
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* Returns a greyscale copy of an image
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*
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* @param WideImage_Image $image
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* @return WideImage_Image
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*/
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function execute($image)
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{
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$palette = !$image->isTrueColor();
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$transparent = $image->isTransparent();
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if ($palette && $transparent)
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$tcrgb = $image->getTransparentColorRGB();
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$new = $image->asTrueColor();
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if (!imagefilter($new->getHandle(), IMG_FILTER_NEGATE))
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throw new WideImage_GDFunctionResultException("imagefilter() returned false");
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if ($palette)
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{
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$new = $new->asPalette();
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if ($transparent)
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{
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$irgb = array('red' => 255 - $tcrgb['red'], 'green' => 255 - $tcrgb['green'], 'blue' => 255 - $tcrgb['blue'], 'alpha' => 127);
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// needs imagecolorexactalpha instead of imagecolorexact, otherwise doesn't work on some transparent GIF images
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$new_tci = imagecolorexactalpha($new->getHandle(), $irgb['red'], $irgb['green'], $irgb['blue'], 127);
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$new->setTransparentColor($new_tci);
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}
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}
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return $new;
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}
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}
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