pdflib_adapter.cls.php

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<?php
/**
 * DOMPDF - PHP5 HTML to PDF renderer
 *
 * File: $RCSfile: pdflib_adapter.cls.php,v $
 * Created on: 2005-02-28
 *
 * Copyright (c) 2004 - Benj Carson <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library in the file LICENSE.LGPL; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * Alternatively, you may distribute this software under the terms of the
 * PHP License, version 3.0 or later.  A copy of this license should have
 * been distributed with this file in the file LICENSE.PHP .  If this is not
 * the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
 *
 * The latest version of DOMPDF might be available at:
 * http://www.digitaljunkies.ca/dompdf
 *
 * @link http://www.digitaljunkies.ca/dompdf
 * @copyright 2004 Benj Carson
 * @author Benj Carson <[e-mail]>
 * @package dompdf
 * @version 0.5.1
 */

/* $Id: pdflib_adapter.cls.php,v 1.2 2006/07/21 10:46:19 mschering Exp $ */

/**
 * PDF rendering interface
 *
 * PDFLib_Adapter provides a simple, stateless interface to the one
 * provided by PDFLib.
 *
 * Unless otherwise mentioned, all dimensions are in points (1/72 in).
 * The coordinate origin is in the top left corner and y values
 * increase downwards.
 *
 * See {@link http://www.pdflib.com/} for more complete documentation
 * on the underlying PDFlib functions.
 *
 * @package dompdf
 */
class PDFLib_Adapter implements Canvas {

  /**
   * Dimensions of paper sizes in points
   *
   * @var array;
   */
  static public $PAPER_SIZES = array(); // Set to
                                        // CPDF_Adapter::$PAPER_SIZES below.

  /**
   * Fudge factor to adjust reported font heights
   *
   * CPDF reports larger font heights than PDFLib.  This factor
   * adjusts the height reported by get_font_height().
   *
   * @var float
   */
  const FONT_HEIGHT_SCALE = 1.2;

  /**
   * Whether to create PDFs in memory or on disk
   *
   * @var bool
   */
  static $IN_MEMORY = true;

  /**
   * Instance of PDFLib class
   *
   * @var PDFlib
   */
  private $_pdf;

  /**
   * Name of temporary file used for PDFs created on disk
   *
   * @var string
   */
  private $_file;

  /**
   * PDF width, in points
   *
   * @var float
   */
  private $_width;

  /**
   * PDF height, in points
   *
   * @var height
   */
  private $_height;

  /**
   * Last fill colour used
   *
   * @var array
   */
  private $_last_fill_color;

  /**
   * Last stroke colour used
   *
   * @var array
   */
  private $_last_stroke_color;

  /**
   * Cache of image handles
   *
   * @var array
   */
  private $_imgs;

  /**
   * Cache of font handles
   *
   * @var array
   */
  private $_fonts;

  /**
   * List of objects (templates) to add to multiple pages
   *
   * @var array
   */
  private $_objs;

  /**
   * Current page number
   *
   * @var int
   */
  private $_page_number;

  /**
   * Total number of pages
   *
   * @var int
   */
  private $_page_count;

  /**
   * Text to display on every page
   *
   * @var array
   */
  private $_page_text;

  /**
   * Array of pages for accesing after rendering is initially complete
   *
   * @var array
   */
  private $_pages;

  /**
   * Class constructor
   *
   * @param mixed $paper The size of paper to use either a string (see {@link CPDF_Adapter::$PAPER_SIZES}) or
   *                     an array(xmin,ymin,xmax,ymax)
   * @param string $orientation The orientation of the document (either 'landscape' or 'portrait')
   */
  function __construct($paper = "letter", $orientation = "portrait") {
    if ( is_array($paper) )
      $size = $paper;
    else if ( isset(self::$PAPER_SIZES[mb_strtolower($paper)]) )
      $size = self::$PAPER_SIZES[$paper];
    else
      $size = self::$PAPER_SIZES["letter"];

    if ( mb_strtolower($orientation) == "landscape" ) {
      $a = $size[3];
      $size[3] = $size[2];
      $size[2] = $a;
    }
    $this->_width = $size[2] - $size[0];
    $this->_height= $size[3] - $size[1];

    $this->_pdf = new PDFLib();

	if ( defined("DOMPDF_PDFLIB_LICENSE") )
      $this->_pdf->set_parameter( "license", DOMPDF_PDFLIB_LICENSE);

	$this->_pdf->set_parameter("textformat", "utf8");
    $this->_pdf->set_parameter("fontwarning", "false");

    $this->_pdf->set_info("Creator", "DOMPDF Converter");

    // Silence pedantic warnings about missing TZ settings
    if ( function_exists("date_default_timezone_get") ) {
      $tz = @date_default_timezone_get();
      date_default_timezone_set("UTC");
      $this->_pdf->set_info("Date", date("Y-m-d"));
      date_default_timezone_set($tz);
    } else {
      $this->_pdf->set_info("Date", date("Y-m-d"));
    }

    if ( self::$IN_MEMORY )
      $this->_pdf->begin_document("","");
    else {
      $this->_file = tempnam(DOMPDF_TEMP_DIR, "dompdf_tmp_");
      $this->_pdf->begin_document($this->_file,"");
    }

    $this->_pdf->begin_page_ext($this->_width, $this->_height, "");

    $this->_page_number = $this->_page_count = 1;
    $this->_page_text = array();

    $this->_imgs = array();
    $this->_fonts = array();
    $this->_objs = array();

    // Set up font paths
    $families = Font_Metrics::get_font_families();
    foreach ($families as $family => $files) {
      foreach ($files as $style => $file) {
        $face = basename($file);

        // Prefer ttfs to afms
        if ( file_exists($file.".ttf") )
          $file .= ".ttf";

        else if ( file_exists($file .".TTF") )
          $file .= ".TTF";

        else if ( file_exists($file . ".pfb") )
          $file .= ".pfb";

        else if ( file_exists($file . ".PFB") )
          $file .= ".PFB";

        else
          continue;

        $this->_pdf->set_parameter("FontOutline", "\{$face\}=\{$file\}");
      }
    }
  }

  /**
   * Close the pdf
   */
  protected function _close() {
    $this->_place_objects();

    // Close all pages
    $this->_pdf->suspend_page("");
    for ($p = 1; $p <= $this->_page_count; $p++) {
      $this->_pdf->resume_page("pagenumber=$p");
      $this->_pdf->end_page_ext("");
    }

    $this->_pdf->end_document("");
  }


  /**
   * Returns the PDFLib instance
   *
   * @return PDFLib
   */
  function get_pdflib() { return $this->_pdf; }

  /**
   * Opens a new 'object' (template in PDFLib-speak)
   *
   * While an object is open, all drawing actions are recorded to the
   * object instead of being drawn on the current page.  Objects can
   * be added later to a specific page or to several pages.
   *
   * The return value is an integer ID for the new object.
   *
   * @see PDFLib_Adapter::close_object()
   * @see PDFLib_Adapter::add_object()
   *
   * @return int
   */
  function open_object() {
    $this->_pdf->suspend_page("");
    $ret = $this->_pdf->begin_template($this->_width, $this->_height);
    $this->_pdf->save();
    $this->_objs[$ret] = array("start_page" => $this->_page_number);
    return $ret;
  }

  /**
   * Reopen an existing object (NOT IMPLEMENTED)
   *
   * PDFLib does not seem to support reopening templates.
   *
   * @param int $object the ID of a previously opened object
   */
  function reopen_object($object) {
    throw new DOMPDF_Exception("PDFLib does not support reopening objects.");
  }

  /**
   * Close the current template
   *
   * @see PDFLib_Adapter::open_object()
   */
  function close_object() {
    $this->_pdf->restore();
    $this->_pdf->end_template();
    $this->_pdf->resume_page("pagenumber=".$this->_page_number);
  }

  /**
   * Adds the specified object to the document
   *
   * $where can be one of:
   * - 'add' add to current page only
   * - 'all' add to every page from the current one onwards
   * - 'odd' add to all odd numbered pages from now on
   * - 'even' add to all even numbered pages from now on
   * - 'next' add the object to the next page only
   * - 'nextodd' add to all odd numbered pages from the next one
   * - 'nexteven' add to all even numbered pages from the next one
   *
   * @param int $object the object handle returned by open_object()
   * @param string $where
   */
  function add_object($object, $where = 'all') {

    if ( mb_strpos($where, "next") !== false ) {
      $this->_objs[$object]["start_page"]++;
      $where = str_replace("next", "", $where);
      if ( $where == "" )
        $where = "add";
    }

    $this->_objs[$object]["where"] = $where;
  }

  /**
   * Stops the specified template from appearing in the document.
   *
   * The object will stop being displayed on the page following the
   * current one.
   *
   * @param int $object
   */
  function stop_object($object) {

    if ( !isset($this->_objs[$object]) )
      return;

    $start = $this->_objs[$object]["start_page"];
    $where = $this->_objs[$object]["where"];

    // Place the object on this page if required
    if ( $this->_page_number >= $start &&
         (($this->_page_number % 2 == 0 && $where == "even") ||
          ($this->_page_number % 2 == 1 && $where == "odd") ||
          ($where == "all")) )
      $this->_pdf->fit_image($object,0,0,"");

    unset($this->_objs[$object]);
  }

  /**
   * Add all active objects to the current page
   */
  protected function _place_objects() {

    foreach ( $this->_objs as $obj => $props ) {
      $start = $props["start_page"];
      $where = $props["where"];

      // Place the object on this page if required
      if ( $this->_page_number >= $start &&
           (($this->_page_number % 2 == 0 && $where == "even") ||
            ($this->_page_number % 2 == 1 && $where == "odd") ||
            ($where == "all")) ) {
        $this->_pdf->fit_image($obj,0,0,"");
      }
    }

  }

  function get_width() { return $this->_width; }

  function get_height() { return $this->_height; }

  function get_page_number() { return $this->_page_number; }

  function get_page_count() { return $this->_page_count; }

  function set_page_number($num) { $this->_page_number = (int)$num; }

  function set_page_count($count) { $this->_page_count = (int)$count; }


  /**
   * Sets the line style
   *
   * @param float width
   * @param string corner
   * @param string join
   * @param array dash
   */
  protected function _set_line_style($width, $cap, $join, $dash) {

    if ( count($dash) == 1 )
      $dash[] = $dash[0];

    if ( count($dash) > 1 )
      $this->_pdf->setdashpattern("dasharray={" . join(" ", $dash) . "}");
    else
      $this->_pdf->setdash(0,0);

    switch ( $join ) {
    case "miter":
      $this->_pdf->setlinejoin(0);
      break;

    case "round":
      $this->_pdf->setlinejoin(1);
      break;

    case "bevel":
      $this->_pdf->setlinejoin(2);
      break;

    default: