Flip.php

<?php
    /**
##DOC-SIGNATURE##

    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
  **/

namespace WideImage\Operation;

use WideImage\Exception\GDFunctionResultException;

/**
 * Flip operation class
 *
 * @package Internal/Operations
 */
class Flip
{
    /**
     * Returns a flipped image
     *
     * @param \WideImage\Image $image
     * @return \WideImage\Image
     */
    public function execute($image)
    {
        $new = $image->copy();
        
        $width  = $image->getWidth();
        $height = $image->getHeight();
        
        if ($new->isTransparent()) {
            imagefilledrectangle($new->getHandle(), 0, 0, $width, $height, $new->getTransparentColor());
        }
        
        for ($y = 0; $y < $height; $y++) {
            if (!imagecopy($new->getHandle(), $image->getHandle(), 0, $y, 0, $height - $y - 1, $width, 1)) {
                throw new GDFunctionResultException("imagecopy() returned false");
            }
        }
        
        return $new;
    }
}