<?php
/*
* File: SimpleImage.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 08/11/06
* Link: http://www.white-hat-web-design.co.uk/articles/php-image-resizing.php
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details:
* http://www.gnu.org/licenses/gpl.html
*
*/

class SimpleImage
{

	var $image;
	var $image_type;

	function load($filename)
	{
		$image_info = getimagesize($filename);
		$this->image_type = $image_info[2];
		if ($this->image_type == IMAGETYPE_JPEG)
		{
			$this->image = imagecreatefromjpeg($filename);
		}
		elseif ($this->image_type == IMAGETYPE_GIF)
		{
			$this->image = imagecreatefromgif($filename);
		}
		elseif ($this->image_type == IMAGETYPE_PNG)
		{
			$this->image = imagecreatefrompng($filename);
		}
	}

	function save($filename, $image_type = IMAGETYPE_JPEG, $compression = 75, $permissions = null)
	{
		// do this or they'll all go to jpeg
		$image_type = $this->image_type;

		if ($image_type == IMAGETYPE_JPEG)
		{
			imagejpeg($this->image, $filename, $compression);
		}
		elseif ($image_type == IMAGETYPE_GIF)
		{
			imagegif($this->image, $filename);
		}
		elseif ($image_type == IMAGETYPE_PNG)
		{
			// need this for transparent png to work
			imagealphablending($this->image, false);
			imagesavealpha($this->image, true);
			imagepng($this->image, $filename);
		}
		if ($permissions != null)
		{
			chmod($filename, $permissions);
		}
	}

	function output($image_type = IMAGETYPE_JPEG)
	{
		if ($image_type == IMAGETYPE_JPEG)
		{
			imagejpeg($this->image);
		}
		elseif ($image_type == IMAGETYPE_GIF)
		{
			imagegif($this->image);
		}
		elseif ($image_type == IMAGETYPE_PNG)
		{
			imagepng($this->image);
		}
	}

	function getWidth()
	{
		return imagesx($this->image);
	}

	function getHeight()
	{
		return imagesy($this->image);
	}

	function resizeToHeight($height)
	{
		$ratio = $height / $this->getHeight();
		$width = $this->getWidth() * $ratio;
		$this->resize($width, $height);
	}

	function resizeToWidth($width)
	{
		$ratio = $width / $this->getWidth();
		$height = $this->getheight() * $ratio;
		$this->resize($width, $height);
	}

	function scale($scale)
	{
		$width = $this->getWidth() * $scale / 100;
		$height = $this->getheight() * $scale / 100;
		$this->resize($width, $height);
	}

	function resize($width,$height,$forcesize='n') {

	  /* optional. if file is smaller, do not resize. */
	  if ($forcesize == 'n') {
	      if ($width > $this->getWidth() && $height > $this->getHeight()){
	          $width = $this->getWidth();
	          $height = $this->getHeight();
	      }
	  }

	  $new_image = imagecreatetruecolor($width, $height);
	  /* Check if this image is PNG or GIF, then set if Transparent*/
	  if(($this->image_type == IMAGETYPE_GIF) || ($this->image_type==IMAGETYPE_PNG)){
	      imagealphablending($new_image, false);
	      imagesavealpha($new_image,true);
	      $transparent = imagecolorallocatealpha($new_image, 255, 255, 255, 127);
	      imagefilledrectangle($new_image, 0, 0, $width, $height, $transparent);
	  }
	  imagecopyresampled($new_image, $this->image, 0, 0, 0, 0, $width, $height, $this->getWidth(), $this->getHeight());

	  $this->image = $new_image;
	}
}

?>