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File: canvas_factory.cls.php

<?php
/**
 * @package dompdf
 * @link    http://www.dompdf.com/
 * @author  Benj Carson <benjcarson@digitaljunkies.ca>
 * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @version $Id: canvas_factory.cls.php 448 2011-11-13 13:00:03Z fabien.menager $
 */

/**
 * Create canvas instances
 *
 * The canvas factory creates canvas instances based on the
 * availability of rendering backends and config options.
 *
 * @package dompdf
 */
class Canvas_Factory {

  /**
   * Constructor is private: this is a static class
   */
  private function __construct() { }

  /**
   * @param string|array $paper
   * @param string $orientation
   * @param string $class
   * 
   * @return Canvas
   */
  static function get_instance($paper = null, $orientation = null,  $class = null) {

    $backend = strtolower(DOMPDF_PDF_BACKEND);
    
    if ( isset($class) && class_exists($class, false) )
      $class .= "_Adapter";
    
    else if ( (DOMPDF_PDF_BACKEND === "auto" || $backend === "pdflib" ) &&
              class_exists("PDFLib", false) )
      $class = "PDFLib_Adapter";

    // FIXME The TCPDF adapter is not ready yet
    //else if ( (DOMPDF_PDF_BACKEND === "auto" || $backend === "cpdf") )
    //  $class = "CPDF_Adapter";

    else if ( $backend === "tcpdf")
      $class = "TCPDF_Adapter";
      
    else if ( $backend === "gd" )
      $class = "GD_Adapter";
    
    else
      $class = "CPDF_Adapter";

    return new $class($paper, $orientation);
        
  }
}