91 lines
2.3 KiB
PHP
91 lines
2.3 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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* CopyChannelsPalette operation class
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*
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* This operation is intended to be used on palette images
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*
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* @package Internal/Operations
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*/
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class WideImage_Operation_CopyChannelsPalette
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{
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/**
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* Returns an image with only specified channels copied
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*
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* @param WideImage_PaletteImage $img
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* @param array $channels
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* @return WideImage_PaletteImage
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*/
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function execute($img, $channels)
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{
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$blank = array('red' => 0, 'green' => 0, 'blue' => 0);
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if (isset($channels['alpha']))
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unset($channels['alpha']);
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$width = $img->getWidth();
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$height = $img->getHeight();
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$copy = WideImage_PaletteImage::create($width, $height);
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if ($img->isTransparent())
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{
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$otci = $img->getTransparentColor();
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$TRGB = $img->getColorRGB($otci);
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$tci = $copy->allocateColor($TRGB);
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}
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else
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{
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$otci = null;
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$tci = null;
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}
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for ($x = 0; $x < $width; $x++)
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for ($y = 0; $y < $height; $y++)
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{
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$ci = $img->getColorAt($x, $y);
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if ($ci === $otci)
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{
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$copy->setColorAt($x, $y, $tci);
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continue;
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}
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$RGB = $img->getColorRGB($ci);
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$newRGB = $blank;
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foreach ($channels as $channel)
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$newRGB[$channel] = $RGB[$channel];
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$color = $copy->getExactColor($newRGB);
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if ($color == -1)
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$color = $copy->allocateColor($newRGB);
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$copy->setColorAt($x, $y, $color);
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}
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if ($img->isTransparent())
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$copy->setTransparentColor($tci);
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return $copy;
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}
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}
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