rlm@3: <?php
rlm@3: /**
rlm@3:  * Styx::Image - Provides an Interface to the GD-Library for image manipulation
rlm@3:  *
rlm@3:  * @package Styx
rlm@3:  * @subpackage Utility
rlm@3:  *
rlm@3:  * @license MIT-style License
rlm@3:  * @author Christoph Pojer <christoph.pojer@gmail.com>
rlm@3:  *
rlm@3:  * @link http://www.bin-co.com/php/scripts/classes/gd_image/ Based on work by "Binny V A"
rlm@3:  */
rlm@3: 
rlm@3: class Image {
rlm@3: 	/**
rlm@3: 	 * The path to the image file
rlm@3: 	 *
rlm@3: 	 * @var string
rlm@3: 	 */
rlm@3: 	private $file;
rlm@3: 	/**
rlm@3: 	 * The image resource
rlm@3: 	 *
rlm@3: 	 * @var resource
rlm@3: 	 */
rlm@3: 	private $image;
rlm@3: 	/**
rlm@3: 	 * Metadata regarding the image
rlm@3: 	 *
rlm@3: 	 * @var array
rlm@3: 	 */
rlm@3: 	private $meta;
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * @param string $file The path to the image file
rlm@3: 	 */
rlm@3: 	public function __construct($file){
rlm@3: 		$file = realpath($file);
rlm@3: 		if(!file_exists($file))
rlm@3: 			return;
rlm@3: 		
rlm@3: 		$this->file = $file;
rlm@3: 		$img = getimagesize($file);
rlm@3: 
rlm@3: 		$this->meta = array(
rlm@3: 			'width' => $img[0],
rlm@3: 			'height' => $img[1],
rlm@3: 			'mime' => $img['mime'],
rlm@3: 			'ext' => end(explode('/', $img['mime'])),
rlm@3: 		);
rlm@3: 		if($this->meta['ext']=='jpg')
rlm@3: 			$this->meta['ext'] = 'jpeg';
rlm@3: 		
rlm@3: 		if(!in_array($this->meta['ext'], array('gif', 'png', 'jpeg')))
rlm@3: 			return;
rlm@3: 		
rlm@3: 		if(in_array($this->meta['ext'], array('gif', 'png'))){
rlm@3: 			$this->image = $this->create();
rlm@3: 			
rlm@3: 			$fn = 'imagecreatefrom'.$this->meta['ext'];
rlm@3: 			$original = $fn($file);
rlm@3: 			imagecopyresampled($this->image, $original, 0, 0, 0, 0, $this->meta['width'], $this->meta['height'], $this->meta['width'], $this->meta['height']);
rlm@3: 		}else{
rlm@3: 			$this->image = imagecreatefromjpeg($file);
rlm@3: 		}
rlm@3: 	}
rlm@3: 	
rlm@3: 	public function __destruct(){
rlm@3: 		if(!empty($this->image)) imagedestroy($this->image);
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Returns the size of the image
rlm@3: 	 *
rlm@3: 	 * @return array
rlm@3: 	 */
rlm@3: 	public function getSize(){
rlm@3: 		return array(
rlm@3: 			'width' => $this->meta['width'],
rlm@3: 			'height' => $this->meta['height'],
rlm@3: 		);
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Creates a new, empty image with the desired size
rlm@3: 	 *
rlm@3: 	 * @param int $x
rlm@3: 	 * @param int $y
rlm@3: 	 * @param string $ext
rlm@3: 	 * @return resource
rlm@3: 	 */
rlm@3: 	private function create($x = null, $y = null, $ext = null){
rlm@3: 		if(!$x) $x = $this->meta['width'];
rlm@3: 		if(!$y) $y = $this->meta['height'];
rlm@3: 		
rlm@3: 		$image = imagecreatetruecolor($x, $y);
rlm@3: 		if(!$ext) $ext = $this->meta['ext'];
rlm@3: 		if($ext=='png'){
rlm@3: 			imagealphablending($image, false);
rlm@3: 			imagefilledrectangle($image, 0, 0, $x, $y, imagecolorallocatealpha($image, 0, 0, 0, 127));
rlm@3: 		}
rlm@3: 		
rlm@3: 		return $image;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Replaces the image resource with the given parameter
rlm@3: 	 *
rlm@3: 	 * @param resource $new
rlm@3: 	 */
rlm@3: 	private function set($new){
rlm@3: 		imagedestroy($this->image);
rlm@3: 		$this->image = $new;
rlm@3: 		
rlm@3: 		$this->meta['width'] = imagesx($this->image);
rlm@3: 		$this->meta['height'] = imagesy($this->image);
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Returns the path to the image file
rlm@3: 	 *
rlm@3: 	 * @return string
rlm@3: 	 */
rlm@3: 	public function getPathname(){
rlm@3: 		return $this->file;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Rotates the image by the given angle
rlm@3: 	 *
rlm@3: 	 * @param int $angle
rlm@3: 	 * @param array $bgcolor An indexed array with red/green/blue/alpha values
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function rotate($angle, $bgcolor = null){
rlm@3: 		if(empty($this->image) || !$angle || $angle>=360) return $this;
rlm@3: 		
rlm@3: 		$this->set(imagerotate($this->image, $angle, is_array($bgcolor) ? imagecolorallocatealpha($this->image, $bgcolor[0], $bgcolor[1], $bgcolor[2], !empty($bgcolor[3]) ? $bgcolor[3] : null) : $bgcolor));
rlm@3: 
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Resizes the image to the given size, automatically calculates
rlm@3: 	 * the new ratio if parameter {@link $ratio} is set to true
rlm@3: 	 *
rlm@3: 	 * @param int $x
rlm@3: 	 * @param int $y
rlm@3: 	 * @param bool $ratio
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function resize($x = null, $y = null, $ratio = true){
rlm@3: 		if(empty($this->image) || (!$x && !$y)) return $this;
rlm@3: 		
rlm@3: 		if(!$y) $y = $ratio ? $this->meta['height']*$x/$this->meta['width'] : $this->meta['height'];
rlm@3: 		if(!$x) $x = $ratio ? $this->meta['width']*$y/$this->meta['height'] : $this->meta['width'];
rlm@3: 		
rlm@3: 		$new = $this->create($x, $y);
rlm@3: 		imagecopyresampled($new, $this->image, 0, 0, 0, 0, $x, $y, $this->meta['width'], $this->meta['height']);
rlm@3: 		$this->set($new);
rlm@3: 		
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Crops the image. The values are given like margin/padding values in css
rlm@3: 	 *
rlm@3: 	 * <b>Example</b>
rlm@3: 	 * <ul>
rlm@3: 	 * <li>crop(10) - Crops by 10px on all sides</li>
rlm@3: 	 * <li>crop(10, 5) - Crops by 10px on top and bottom and by 5px on left and right sides</li>
rlm@3: 	 * <li>crop(10, 5, 5) - Crops by 10px on top and by 5px on left, right and bottom sides</li>
rlm@3: 	 * <li>crop(10, 5, 3, 2) - Crops by 10px on top, 5px by right, 3px by bottom and 2px by left sides</li>
rlm@3: 	 * </ul>
rlm@3: 	 *
rlm@3: 	 * @param int $top
rlm@3: 	 * @param int $right
rlm@3: 	 * @param int $bottom
rlm@3: 	 * @param int $left
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function crop($top, $right = null, $bottom = null, $left = null){
rlm@3: 		if(empty($this->image)) return $this;
rlm@3: 		
rlm@3: 		if(!is_numeric($right) && !is_numeric($bottom) && !is_numeric($left))
rlm@3: 			$right = $bottom = $left = $top;
rlm@3: 		
rlm@3: 		if(!is_numeric($bottom) && !is_numeric($left)){
rlm@3: 			$bottom = $top;
rlm@3: 			$left = $right;
rlm@3: 		}
rlm@3: 		
rlm@3: 		if(!is_numeric($left))
rlm@3: 			$left = $right;
rlm@3: 		
rlm@3: 		$x = $this->meta['width']-$left-$right;
rlm@3: 		$y = $this->meta['height']-$top-$bottom;
rlm@3: 
rlm@3: 		if($x<0 || $y<0) return $this;
rlm@3: 		
rlm@3: 		$new = $this->create($x, $y);
rlm@3: 		imagecopy($new, $this->image, 0, 0, $left, $top, $x, $y);
rlm@3: 		$this->set($new);
rlm@3: 		
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Flips the image horizontally or vertically. To Flip both just use ->rotate(180)
rlm@3: 	 *
rlm@3: 	 * @see Image::rotate()
rlm@3: 	 * @param string $type Either horizontal or vertical
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function flip($type){
rlm@3: 		if(empty($this->image) || !in_array($type, array('horizontal', 'vertical'))) return $this;
rlm@3: 		
rlm@3: 		$new = $this->create();
rlm@3: 		
rlm@3: 		if($type=='horizontal')
rlm@3: 			for($x=0;$x<$this->meta['width'];$x++)
rlm@3: 				imagecopy($new, $this->image, $this->meta['width']-$x-1, 0, $x, 0, 1, $this->meta['height']);
rlm@3: 		elseif($type=='vertical')
rlm@3: 			for($y=0;$y<$this->meta['height'];$y++)
rlm@3: 				imagecopy($new, $this->image, 0, $this->meta['height']-$y-1, 0, $y, $this->meta['width'], 1);
rlm@3: 		
rlm@3: 		$this->set($new);
rlm@3: 		
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 	
rlm@3: 	/**
rlm@3: 	 * Stores the image in the desired directory or outputs it
rlm@3: 	 *
rlm@3: 	 * @param string $ext
rlm@3: 	 * @param string $file
rlm@3: 	 */
rlm@3: 	private function process($ext = null, $file = null){
rlm@3: 		if(!$ext) $ext = $this->meta['ext'];
rlm@3: 		
rlm@3: 		if($ext=='png') imagesavealpha($this->image, true);
rlm@3: 		$fn = 'image'.$ext;
rlm@3: 		$fn($this->image, $file);
rlm@3: 		
rlm@3: 		// If there is a new filename change the internal name too
rlm@3: 		if($file) $this->file = $file;
rlm@3: 	}
rlm@3: 
rlm@3: 	/**
rlm@3: 	 * Saves the image to the given path
rlm@3: 	 *
rlm@3: 	 * @param string $file Leave empty to replace the original file
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function save($file = null){
rlm@3: 		if(empty($this->image)) return $this;
rlm@3: 		
rlm@3: 		if(!$file) $file = $this->file;
rlm@3: 		
rlm@3: 		$ext = strtolower(pathinfo($file, PATHINFO_EXTENSION));
rlm@3: 		if(!$ext){
rlm@3: 			$file .= '.'.$this->meta['ext'];
rlm@3: 			$ext = $this->meta['ext'];
rlm@3: 		}
rlm@3: 		
rlm@3: 		if($ext=='jpg') $ext = 'jpeg';
rlm@3: 		
rlm@3: 		if(!in_array($ext, array('png', 'jpeg', 'gif')))
rlm@3: 			return $this;
rlm@3: 		
rlm@3: 		$this->process($ext, $file);
rlm@3: 		
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 
rlm@3: 	/**
rlm@3: 	 * Outputs the manipulated image
rlm@3: 	 *
rlm@3: 	 * @return Image
rlm@3: 	 */
rlm@3: 	public function show(){
rlm@3: 		if(empty($this->image)) return $this;
rlm@3: 		
rlm@3: 		header('Content-type: '.$this->meta['mime']);
rlm@3: 		$this->process();
rlm@3: 		
rlm@3: 		return $this;
rlm@3: 	}
rlm@3: 	
rlm@3: }