87 lines
2.6 KiB
PHP
87 lines
2.6 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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* Crop operation class
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*
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* @package Internal/Operations
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*/
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class WideImage_Operation_Crop
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{
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/**
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* Returns a cropped image
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*
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* @param WideImage_Image $img
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* @param smart_coordinate $left
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* @param smart_coordinate $top
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* @param smart_coordinate $width
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* @param smart_coordinate $height
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* @return WideImage_Image
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*/
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function execute($img, $left, $top, $width, $height)
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{
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$width = WideImage_Coordinate::fix($width, $img->getWidth(), $width);
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$height = WideImage_Coordinate::fix($height, $img->getHeight(), $height);
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$left = WideImage_Coordinate::fix($left, $img->getWidth(), $width);
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$top = WideImage_Coordinate::fix($top, $img->getHeight(), $height);
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if ($left < 0)
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{
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$width = $left + $width;
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$left = 0;
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}
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if ($width > $img->getWidth() - $left)
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$width = $img->getWidth() - $left;
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if ($top < 0)
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{
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$height = $top + $height;
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$top = 0;
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}
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if ($height > $img->getHeight() - $top)
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$height = $img->getHeight() - $top;
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if ($width <= 0 || $height <= 0)
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throw new WideImage_Exception("Can't crop outside of an image.");
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$new = $img->doCreate($width, $height);
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if ($img->isTransparent() || $img instanceof WideImage_PaletteImage)
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{
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$new->copyTransparencyFrom($img);
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if (!imagecopyresized($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height))
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throw new WideImage_GDFunctionResultException("imagecopyresized() returned false");
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}
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else
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{
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$new->alphaBlending(false);
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$new->saveAlpha(true);
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if (!imagecopyresampled($new->getHandle(), $img->getHandle(), 0, 0, $left, $top, $width, $height, $width, $height))
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throw new WideImage_GDFunctionResultException("imagecopyresampled() returned false");
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}
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return $new;
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}
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}
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