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modules/revsliderprestashop/includes/resize-imag.php

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+<?php
+/**
+ * Resize image class will allow you to resize an image
+ *
+ * Can resize to exact size
+ * Max width size while keep aspect ratio
+ * Max height size while keep aspect ratio
+ * Automatic while keep aspect ratio
+ */
+class ResizeImage
+{
+	private $ext;
+	private $image;
+	private $newImage;
+	private $origWidth;
+	private $origHeight;
+	private $resizeWidth;
+	private $resizeHeight;
+	/**
+	 * Class constructor requires to send through the image filename
+	 *
+	 * @param string $filename - Filename of the image you want to resize
+	 */
+	public function __construct( $filename )
+	{
+		if(file_exists($filename))
+		{
+			$this->setImage( $filename );
+		} 
+		//else {
+			//throw new Exception('Image ' . $filename . ' can not be found, try another image.');
+		//}
+	}
+	/**
+	 * Set the image variable by using image create
+	 *
+	 * @param string $filename - The image filename
+	 */
+	private function setImage( $filename )
+	{
+		$size = getimagesize($filename);
+		if(isset($size['mime']) && !empty($size['mime'])){
+			$this->ext = $size['mime'];
+			switch($this->ext)
+				{
+					// Image is a JPG
+						case 'image/jpg':
+						case 'image/jpeg':
+							// create a jpeg extension
+								$this->image = imagecreatefromjpeg($filename);
+								break;
+						// Image is a GIF
+						case 'image/gif':
+								$this->image = @imagecreatefromgif($filename);
+								break;
+						// Image is a PNG
+						case 'image/png':
+								$this->image = @imagecreatefrompng($filename);
+								break;
+						// Mime type not found
+						default:
+								throw new Exception("File is not an image, please use another file type.", 1);
+				}
+				$this->origWidth = imagesx($this->image);
+				$this->origHeight = imagesy($this->image);
+		}
+		
+	}
+	/**
+	 * Save the image as the image type the original image was
+	 *
+	 * @param  String[type] $savePath     - The path to store the new image
+	 * @param  string $imageQuality 	  - The qulaity level of image to create
+	 *
+	 * @return Saves the image
+	 */
+	public  function saveImage($savePath, $imageQuality="100", $download = false)
+	{
+	    switch($this->ext)
+	    {
+	        case 'image/jpg':
+	        case 'image/jpeg':
+	        	// Check PHP supports this file type
+	            if (imagetypes() & IMG_JPG) {
+	                imagejpeg($this->newImage, $savePath, $imageQuality);
+	            }
+	            break;
+	        case 'image/gif':
+	        	// Check PHP supports this file type
+	            if (imagetypes() & IMG_GIF) {
+	                imagegif($this->newImage, $savePath);
+	            }
+	            break;
+	        case 'image/png':
+	            $invertScaleQuality = 9 - round(($imageQuality/100) * 9);
+	            // Check PHP supports this file type
+	            if (imagetypes() & IMG_PNG) {
+	                imagepng($this->newImage, $savePath, $invertScaleQuality);
+	            }
+	            break;
+	    }
+	    if($download)
+	    {
+	    	header('Content-Description: File Transfer');
+			header("Content-type: application/octet-stream");
+			header("Content-disposition: attachment; filename= ".$savePath."");
+			readfile($savePath);
+	    }
+	    imagedestroy($this->newImage);
+	}
+	/**
+	 * Resize the image to these set dimensions
+	 *
+	 * @param  int $width        	- Max width of the image
+	 * @param  int $height       	- Max height of the image
+	 * @param  string $resizeOption - Scale option for the image
+	 *
+	 * @return Save new image
+	 */
+	public function resizeTo( $width, $height, $resizeOption = 'default' )
+	{
+		switch(strtolower($resizeOption))
+		{
+			case 'exact':
+				$this->resizeWidth = $width;
+				$this->resizeHeight = $height;
+			break;
+			case 'maxwidth':
+				$this->resizeWidth  = $width;
+				$this->resizeHeight = $this->resizeHeightByWidth($width);
+			break;
+			case 'maxheight':
+				$this->resizeWidth  = $this->resizeWidthByHeight($height);
+				$this->resizeHeight = $height;
+			break;
+			default:
+				if($this->origWidth > $width || $this->origHeight > $height)
+				{
+					if ( $this->origWidth > $this->origHeight ) {
+				    	 $this->resizeHeight = $this->resizeHeightByWidth($width);
+			  			 $this->resizeWidth  = $width;
+					} else if( $this->origWidth < $this->origHeight ) {
+						$this->resizeWidth  = $this->resizeWidthByHeight($height);
+						$this->resizeHeight = $height;
+					}
+				} else {
+		            $this->resizeWidth = $width;
+		            $this->resizeHeight = $height;
+		        }
+			break;
+		}
+		$this->newImage = imagecreatetruecolor($this->resizeWidth, $this->resizeHeight);
+    	imagecopyresampled($this->newImage, $this->image, 0, 0, 0, 0, $this->resizeWidth, $this->resizeHeight, $this->origWidth, $this->origHeight);
+	}
+	/**
+	 * Get the resized height from the width keeping the aspect ratio
+	 *
+	 * @param  int $width - Max image width
+	 *
+	 * @return Height keeping aspect ratio
+	 */
+	private function resizeHeightByWidth($width)
+	{
+		return floor(($this->origHeight/$this->origWidth)*$width);
+	}
+	/**
+	 * Get the resized width from the height keeping the aspect ratio
+	 *
+	 * @param  int $height - Max image height
+	 *
+	 * @return Width keeping aspect ratio
+	 */
+	private function resizeWidthByHeight($height)
+	{
+		return floor(($this->origWidth/$this->origHeight)*$height);
+	}
+}