<?php

 /*
  * ImageCopier.php
  * $Id$                                                      
   +-------------------------------------------------------------------------+
   | http://phpfunk.com                                                      |
   | Copyright 2007 Salvador T. Pimienta                                     |
   | All Rights Reserved.                                                    |
   +-------------------------------------------------------------------------+
   | Redistribution and use in source and binary forms, with or without      |
   | modification, are permitted provided that the following conditions      | 
   | are met:                                                                |
   |  * Redistributions of source code must retain the above copyright       |
   | notice, this list of conditions and the following disclaimer.           |
   | * Redistributions in binary form must reproduce the above copyright     |
   | notice, this list of conditions and the following disclaimer in the     |
   | documentation and/or other materials provided with the distribution.    |
   | * Neither the name of the phpfunk.com nor the names of its              |
   | contributors may be used to endorse or promote products derived from    |
   | this software without specific prior written permission.                |
   |                                                                         |
   | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS     |
   | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT       |
   | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR   |
   | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT    |
   | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,   |
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   | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,   |
   | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY   |
   | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT     |
   | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE   |
   | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.    |                               
   +----------------------------------------------------------------------- */

define( 'IMAGE_COPIER_GIF', 1);
define( 'IMAGE_COPIER_JPG', 2);
define( 'IMAGE_COPIER_PNG', 3);
 
/**
 * Assumes you've given it a valid image type and file
 */
class ImageCopier {
    
    var $type;
    
    /**
     * @param int $imgtype one of the defined image type constants for this class
     */
    function ImageCopier($imgtype) {
        $this->type = $imgtype;
        
    }
    
    function make_copy($src, $dest) {
        $info = getimagesize($src);
        if(!is_array($info) || $info[2] != $this->type) {
            trigger_error("Illegal argument: src is either not an image or incorrect image type", E_USER_WARNING);
            return FALSE;
        }
        $src_img = $this->create_image_from_file($src);
        # cant true color for gifs!
        if($this->type == IMAGE_COPIER_GIF) {
            # cannot call imagecreatetruecolor for GIF images
            $dest_img = imagecreate($info[0], $info[1]);
        } else {
            $dest_img = imagecreatetruecolor($info[0], $info[1]);
        }
        if(!$src_img || !$dest_img ) {
            trigger_error("Unable to allocate image resources");
            return FALSE;
        }
        $res = imagecopy($dest_img, $src_img, 0, 0, 0, 0, $info[0], $info[1]);
        if($res === FALSE) {
            trigger_error("Unable to copy image", E_USER_WARNING);
            return FALSE;
        }
        switch( $this->type) {
            case IMAGE_COPIER_GIF:
                 $res = imagegif($dest_img, $dest);
                break;
            case IMAGE_COPIER_JPG:
                 $res = imagejpeg($dest_img, $dest);
                 break;
            case IMAGE_COPIER_PNG:
                 $res = imagepng($dest_img, $dest);
                 break;                 
            default:
                break;
        }            
            
        @imagedestroy($src_img);
        @imagedestroy($dest_img);
        return ($res !== FALSE);
    }
    
    /**
     * @access private
     * @return GD handle
     * @param string $file
     */
    function create_image_from_file($file) {
        $info = getimagesize($file);
        if($info[2] == 1) {
            return imagecreatefromgif($file);
        }
        if($info[2] == 2) {
            return imagecreatefromjpeg($file);
        }
        if($info[2] == 3) {
            return imagecreatefrompng($file);
        }
    }
    
}

?>