Resize.php

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<?php

namespace Rsi\Fred\Stream\Handler;

class Resize extends \Rsi\Fred\Stream\Handler{

  public $mode = IMG_BILINEAR_FIXED;
  public $jpegQuality = 80;
  public $widths = []; //!< Allowed widths (small to large; empty = all).
  public $heights = []; //!< Allowed heights (small to large; empty = all).
  public $locked = true; //!< Allowed sizes will be locked together by key.

  /**
   * Pick the next larger value from an array.
   * @param array $sizes  Allowed sizes.
   * @param int $size  Current size.
   * @param array $other_sizes  Allowed sizes for other dimension.
   * @param int $other_size  Current size for other dimension (will be adapted when locked).
   */
  protected function index($sizes,&$size,$other_sizes = null,&$other_size = null){
    if($size && $sizes){
      $ref = $size;
      foreach($sizes as $index => $size){
        if($this->locked && $other_sizes) $other_size = \Rsi\Record::get($other_sizes,$index);
        if($size >= $ref) break;
      }
    }
  }
  /**
   * Calculate the dimensions for the image.
   * Taking into account missing dimensions, restrictions, and locking.
   * @param int $orig_width  Width of the original image.
   * @param int $orig_height  Height of the original image.
   * @param int $new_width  In: requested width; out: calculated width.
   * @param int $new_height  In: requested height; out: calculated height.
   */
  protected function dimensions($orig_width,$orig_height,&$new_width,&$new_height){
    $this->index($this->widths,$new_width,$this->heights,$new_height);
    if(!$new_height) $new_height = intdiv($orig_height * $new_width,$orig_width);
    $this->index($this->heights,$new_height,$this->widths,$new_width);
    if(!$new_width) $new_width = intdiv($orig_width * $new_height,$orig_height);
  }

  public function read($handlers,$filename,$params = null){
    $data = parent::read($handlers,$filename,$params);
    $new_width = \Rsi\Record::get($params,'width');
    $new_height = \Rsi\Record::get($params,'height');
    if(($new_width || $new_height) && ($orig_image = imagecreatefromstring($data))){
      $this->dimensions(imagesx($orig_image),imagesy($orig_image),$new_width,$new_height);
      $new_image = imagescale($orig_image,$new_width,$new_height,$this->mode);
      imagedestroy($orig_image);
      ob_start();
      switch(\Rsi\File::ext($filename)){
        case 'gif': imagegif($new_image); break;
        case 'png': imagepng($new_image); break;
        default: imagejpeg($new_image,null,$this->jpegQuality);
      }
      $data = ob_get_clean();
      imagedestroy($new_image);
    }
    return $data;
  }

}