106 lines
3.1 KiB
PHP
106 lines
3.1 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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* ApplyMask operation class
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*
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* @package Internal/Operations
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*/
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class WideImage_Operation_ApplyMask
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{
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/**
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* Applies a mask on the copy of source image
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*
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* @param WideImage_Image $image
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* @param WideImage_Image $mask
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* @param smart_coordinate $left
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* @param smart_coordinate $top
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* @return WideImage_Image
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*/
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function execute($image, $mask, $left = 0, $top = 0)
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{
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$left = WideImage_Coordinate::fix($left, $image->getWidth(), $mask->getWidth());
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$top = WideImage_Coordinate::fix($top, $image->getHeight(), $mask->getHeight());
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$width = $image->getWidth();
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$mask_width = $mask->getWidth();
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$height = $image->getHeight();
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$mask_height = $mask->getHeight();
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$result = $image->asTrueColor();
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$result->alphaBlending(false);
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$result->saveAlpha(true);
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$srcTransparentColor = $result->getTransparentColor();
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if ($srcTransparentColor >= 0)
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{
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# this was here. works without.
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#$trgb = $image->getColorRGB($srcTransparentColor);
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#$trgb['alpha'] = 127;
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#$destTransparentColor = $result->allocateColorAlpha($trgb);
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#$result->setTransparentColor($destTransparentColor);
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$destTransparentColor = $srcTransparentColor;
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}
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else
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{
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$destTransparentColor = $result->allocateColorAlpha(255, 255, 255, 127);
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}
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for ($x = 0; $x < $width; $x++)
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for ($y = 0; $y < $height; $y++)
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{
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$mx = $x - $left;
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$my = $y - $top;
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if ($mx >= 0 && $mx < $mask_width && $my >= 0 && $my < $mask_height)
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{
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$srcColor = $image->getColorAt($x, $y);
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if ($srcColor == $srcTransparentColor)
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$destColor = $destTransparentColor;
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else
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{
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$maskRGB = $mask->getRGBAt($mx, $my);
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if ($maskRGB['red'] == 0)
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$destColor = $destTransparentColor;
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elseif ($srcColor >= 0)
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{
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$imageRGB = $image->getRGBAt($x, $y);
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$level = ($maskRGB['red'] / 255) * (1 - $imageRGB['alpha'] / 127);
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$imageRGB['alpha'] = 127 - round($level * 127);
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if ($imageRGB['alpha'] == 127)
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$destColor = $destTransparentColor;
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else
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$destColor = $result->allocateColorAlpha($imageRGB);
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}
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else
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$destColor = $destTransparentColor;
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}
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$result->setColorAt($x, $y, $destColor);
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}
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}
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return $result;
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}
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}
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