<?php
//require( '../config.php' );
class ImageResizer
{
  private $src;
  private $dest;
  private $gdImg;
  private $srcData;
  private $srcHeight;
  private $srcWidth;
  private $width;
  private $height;
  
  public function __construct ( $src, $dest, $width, $height )
  {
    $this->src = $src;
    $this->dest = $dest;
    $this->height = $height;
    $this->width = $width;
    $this->prepImg();
  }
  
  private function prepImg ()
  {
    $this->srcData = getimagesize($this->src);
    switch ( $this->srcData['mime'] )
    {
      case 'image/png' :
        $this->gdImg = imagecreatefrompng($this->src);
        break;
      case 'image/jpeg' :
      case 'image/pjpeg' :
        $this->gdImg = imagecreatefromjpeg($this->src);
        break;
      case 'image/gif' :
        $this->gdImg = imagecreatefromgif($this->src);
        break;
    }
    $this->srcWidth = $this->srcData[0];
    $this->srcHeight = $this->srcData[1];
  }
  
  public function doMattResize ()
  {
    
    $ratio_orig = $this->srcWidth/$this->srcHeight;
    $width = $this->width;
    $height = $this->height;
    
    if ($width/$height > $ratio_orig) {
       $width = $height*$ratio_orig;
    } else {
       $height = $width/$ratio_orig;
    }

    $offsetY = 0;
    $offsetX = 0;
    
    if ( $width !== $this->srcWidth )
    {
      $offsetX = round(($this->width / 2) - ($width / 2), 0);
    }
    if ( $height !== $this->srcHeight )
    {
      $offsetY = round(($this->height / 2) - ($height / 2), 0);
    }
    
    // Resample
    $image_p = imagecreatetruecolor($this->width, $this->height);
    $image = $this->gdImg;
    imagecopyresampled($image_p, $image, $offsetX, $offsetY, 0, 0, $width, $height, $this->srcWidth, $this->srcHeight);

    // Output
    imagejpeg($image_p, $this->dest, 90);
    imagedestroy($image_p);
    imagedestroy($this->gdImg);
  }
  
  public function doResize ()
  {
    
    $ratio_orig = $this->srcWidth/$this->srcHeight;
    $width = $this->width;
    $height = $this->height;
    
    if ($width/$height > $ratio_orig) {
       $width = $height * $ratio_orig;
    } else {
       $height = $width / $ratio_orig;
    }

    // Resample
    $image_p = imagecreatetruecolor($width, $height);
    $image = $this->gdImg;
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $this->srcWidth, $this->srcHeight);

    // Output
    imagejpeg($image_p, $this->dest, 90);
    imagedestroy($image_p);
    imagedestroy($this->gdImg);
  }
  
}
//$i = new ImageResizer( IMG_DIR . 'test.jpg', IMG_DIR . 'test.jpg', 500, 375 );
//$i->doMattResize();
?>