/lib/tcpdf/tcpdf.php

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<?php
//============================================================+
// File name   : tcpdf.php
// Version     : 6.0.031
// Begin       : 2002-08-03
// Last Update : 2013-09-15
// Author      : Nicola Asuni - Tecnick.com LTD - www.tecnick.com - info@tecnick.com
// License     : GNU-LGPL v3 (http://www.gnu.org/copyleft/lesser.html)
// -------------------------------------------------------------------
// Copyright (C) 2002-2013 Nicola Asuni - Tecnick.com LTD
//
// This file is part of TCPDF software library.
//
// TCPDF is free software: you can ioredistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// TCPDF 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 License
// along with TCPDF. If not, see
// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
//
// See LICENSE.TXT file for more information.
// -------------------------------------------------------------------
//
// Description :
//   This is a PHP class for generating PDF documents without requiring external extensions.
//
// NOTE:
//   This class was originally derived in 2002 from the Public
//   Domain FPDF class by Olivier Plathey (http://www.fpdf.org),
//   but now is almost entirely rewritten and contains thousands of
//   new lines of code and hundreds new features.
//
// Main features:
//  * no external libraries are required for the basic functions;
//  * all standard page formats, custom page formats, custom margins and units of measure;
//  * UTF-8 Unicode and Right-To-Left languages;
//  * TrueTypeUnicode, TrueType, Type1 and CID-0 fonts;
//  * font subsetting;
//  * methods to publish some XHTML + CSS code, Javascript and Forms;
//  * images, graphic (geometric figures) and transformation methods;
//  * supports JPEG, PNG and SVG images natively, all images supported by GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM) and all images supported via ImagMagick (http://www.imagemagick.org/www/formats.html)
//  * 1D and 2D barcodes: CODE 39, ANSI MH10.8M-1983, USD-3, 3 of 9, CODE 93, USS-93, Standard 2 of 5, Interleaved 2 of 5, CODE 128 A/B/C, 2 and 5 Digits UPC-Based Extention, EAN 8, EAN 13, UPC-A, UPC-E, MSI, POSTNET, PLANET, RMS4CC (Royal Mail 4-state Customer Code), CBC (Customer Bar Code), KIX (Klant index - Customer index), Intelligent Mail Barcode, Onecode, USPS-B-3200, CODABAR, CODE 11, PHARMACODE, PHARMACODE TWO-TRACKS, Datamatrix, QR-Code, PDF417;
//  * JPEG and PNG ICC profiles, Grayscale, RGB, CMYK, Spot Colors and Transparencies;
//  * automatic page header and footer management;
//  * document encryption up to 256 bit and digital signature certifications;
//  * transactions to UNDO commands;
//  * PDF annotations, including links, text and file attachments;
//  * text rendering modes (fill, stroke and clipping);
//  * multiple columns mode;
//  * no-write page regions;
//  * bookmarks, named destinations and table of content;
//  * text hyphenation;
//  * text stretching and spacing (tracking);
//  * automatic page break, line break and text alignments including justification;
//  * automatic page numbering and page groups;
//  * move and delete pages;
//  * page compression (requires php-zlib extension);
//  * XOBject Templates;
//  * Layers and object visibility.
//	* PDF/A-1b support.
//
// -----------------------------------------------------------
// THANKS TO:
//
// Olivier Plathey (http://www.fpdf.org) for original FPDF.
// Efthimios Mavrogeorgiadis (emavro@yahoo.com) for suggestions on RTL language support.
// Klemen Vodopivec (http://www.fpdf.de/downloads/addons/37/) for Encryption algorithm.
// Warren Sherliker (wsherliker@gmail.com) for better image handling.
// dullus for text Justification.
// Bob Vincent (pillarsdotnet@users.sourceforge.net) for <li> value attribute.
// Patrick Benny for text stretch suggestion on Cell().
// Johannes Güntert for JavaScript support.
// Denis Van Nuffelen for Dynamic Form.
// Jacek Czekaj for multibyte justification
// Anthony Ferrara for the reintroduction of legacy image methods.
// Sourceforge user 1707880 (hucste) for line-through mode.
// Larry Stanbery for page groups.
// Martin Hall-May for transparency.
// Aaron C. Spike for Polycurve method.
// Mohamad Ali Golkar, Saleh AlMatrafe, Charles Abbott for Arabic and Persian support.
// Moritz Wagner and Andreas Wurmser for graphic functions.
// Andrew Whitehead for core fonts support.
// Esteban Joël Marín for OpenType font conversion.
// Teus Hagen for several suggestions and fixes.
// Yukihiro Nakadaira for CID-0 CJK fonts fixes.
// Kosmas Papachristos for some CSS improvements.
// Marcel Partap for some fixes.
// Won Kyu Park for several suggestions, fixes and patches.
// Dominik Dzienia for QR-code support.
// Laurent Minguet for some suggestions.
// Christian Deligant for some suggestions and fixes.
// Travis Harris for crop mark suggestion.
// Aleksey Kuznetsov for some suggestions and text shadows.
// Jim Hanlon for several suggestions and patches.
// Anyone else that has reported a bug or sent a suggestion.
//============================================================+

/**
 * @file
 * This is a PHP class for generating PDF documents without requiring external extensions.<br>
 * TCPDF project (http://www.tcpdf.org) was originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
 * <h3>TCPDF main features are:</h3>
 * <ul>
 * <li>no external libraries are required for the basic functions;</li>
 * <li>all standard page formats, custom page formats, custom margins and units of measure;</li>
 * <li>UTF-8 Unicode and Right-To-Left languages;</li>
 * <li>TrueTypeUnicode, TrueType, Type1 and CID-0 fonts;</li>
 * <li>font subsetting;</li>
 * <li>methods to publish some XHTML + CSS code, Javascript and Forms;</li>
 * <li>images, graphic (geometric figures) and transformation methods;
 * <li>supports JPEG, PNG and SVG images natively, all images supported by GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM) and all images supported via ImagMagick (http://www.imagemagick.org/www/formats.html)</li>
 * <li>1D and 2D barcodes: CODE 39, ANSI MH10.8M-1983, USD-3, 3 of 9, CODE 93, USS-93, Standard 2 of 5, Interleaved 2 of 5, CODE 128 A/B/C, 2 and 5 Digits UPC-Based Extention, EAN 8, EAN 13, UPC-A, UPC-E, MSI, POSTNET, PLANET, RMS4CC (Royal Mail 4-state Customer Code), CBC (Customer Bar Code), KIX (Klant index - Customer index), Intelligent Mail Barcode, Onecode, USPS-B-3200, CODABAR, CODE 11, PHARMACODE, PHARMACODE TWO-TRACKS, Datamatrix, QR-Code, PDF417;</li>
 * <li>JPEG and PNG ICC profiles, Grayscale, RGB, CMYK, Spot Colors and Transparencies;</li>
 * <li>automatic page header and footer management;</li>
 * <li>document encryption up to 256 bit and digital signature certifications;</li>
 * <li>transactions to UNDO commands;</li>
 * <li>PDF annotations, including links, text and file attachments;</li>
 * <li>text rendering modes (fill, stroke and clipping);</li>
 * <li>multiple columns mode;</li>
 * <li>no-write page regions;</li>
 * <li>bookmarks, named destinations and table of content;</li>
 * <li>text hyphenation;</li>
 * <li>text stretching and spacing (tracking);</li>
 * <li>automatic page break, line break and text alignments including justification;</li>
 * <li>automatic page numbering and page groups;</li>
 * <li>move and delete pages;</li>
 * <li>page compression (requires php-zlib extension);</li>
 * <li>XOBject Templates;</li>
 * <li>Layers and object visibility;</li>
 * <li>PDF/A-1b support.</li>
 * </ul>
 * Tools to encode your unicode fonts are on fonts/utils directory.</p>
 * @package com.tecnick.tcpdf
 * @author Nicola Asuni
 * @version 6.0.031
 */

// TCPDF configuration
require_once(dirname(__FILE__).'/tcpdf_autoconfig.php');
// TCPDF static font methods and data
require_once(dirname(__FILE__).'/include/tcpdf_font_data.php');
// TCPDF static font methods and data
require_once(dirname(__FILE__).'/include/tcpdf_fonts.php');
// TCPDF static color methods and data
require_once(dirname(__FILE__).'/include/tcpdf_colors.php');
// TCPDF static image methods and data
require_once(dirname(__FILE__).'/include/tcpdf_images.php');
// TCPDF static methods and data
require_once(dirname(__FILE__).'/include/tcpdf_static.php');

// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

/**
 * @class TCPDF
 * PHP class for generating PDF documents without requiring external extensions.
 * TCPDF project (http://www.tcpdf.org) has been originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
 * @package com.tecnick.tcpdf
 * @brief PHP class for generating PDF documents without requiring external extensions.
 * @version 6.0.031
 * @author Nicola Asuni - info@tecnick.com
 */
class TCPDF {

	// Protected properties

	/**
	 * Current page number.
	 * @protected
	 */
	protected $page;

	/**
	 * Current object number.
	 * @protected
	 */
	protected $n;

	/**
	 * Array of object offsets.
	 * @protected
	 */
	protected $offsets = array();

	/**
	 * Array of object IDs for each page.
	 * @protected
	 */
	protected $pageobjects = array();

	/**
	 * Buffer holding in-memory PDF.
	 * @protected
	 */
	protected $buffer;

	/**
	 * Array containing pages.
	 * @protected
	 */
	protected $pages = array();

	/**
	 * Current document state.
	 * @protected
	 */
	protected $state;

	/**
	 * Compression flag.
	 * @protected
	 */
	protected $compress;

	/**
	 * Current page orientation (P = Portrait, L = Landscape).
	 * @protected
	 */
	protected $CurOrientation;

	/**
	 * Page dimensions.
	 * @protected
	 */
	protected $pagedim = array();

	/**
	 * Scale factor (number of points in user unit).
	 * @protected
	 */
	protected $k;

	/**
	 * Width of page format in points.
	 * @protected
	 */
	protected $fwPt;

	/**
	 * Height of page format in points.
	 * @protected
	 */
	protected $fhPt;

	/**
	 * Current width of page in points.
	 * @protected
	 */
	protected $wPt;

	/**
	 * Current height of page in points.
	 * @protected
	 */
	protected $hPt;

	/**
	 * Current width of page in user unit.
	 * @protected
	 */
	protected $w;

	/**
	 * Current height of page in user unit.
	 * @protected
	 */
	protected $h;

	/**
	 * Left margin.
	 * @protected
	 */
	protected $lMargin;

	/**
	 * Right margin.
	 * @protected
	 */
	protected $rMargin;

	/**
	 * Cell left margin (used by regions).
	 * @protected
	 */
	protected $clMargin;

	/**
	 * Cell right margin (used by regions).
	 * @protected
	 */
	protected $crMargin;

	/**
	 * Top margin.
	 * @protected
	 */
	protected $tMargin;

	/**
	 * Page break margin.
	 * @protected
	 */
	protected $bMargin;

	/**
	 * Array of cell internal paddings ('T' => top, 'R' => right, 'B' => bottom, 'L' => left).
	 * @since 5.9.000 (2010-10-03)
	 * @protected
	 */
	protected $cell_padding = array('T' => 0, 'R' => 0, 'B' => 0, 'L' => 0);

	/**
	 * Array of cell margins ('T' => top, 'R' => right, 'B' => bottom, 'L' => left).
	 * @since 5.9.000 (2010-10-04)
	 * @protected
	 */
	protected $cell_margin = array('T' => 0, 'R' => 0, 'B' => 0, 'L' => 0);

	/**
	 * Current horizontal position in user unit for cell positioning.
	 * @protected
	 */
	protected $x;

	/**
	 * Current vertical position in user unit for cell positioning.
	 * @protected
	 */
	protected $y;

	/**
	 * Height of last cell printed.
	 * @protected
	 */
	protected $lasth;

	/**
	 * Line width in user unit.
	 * @protected
	 */
	protected $LineWidth;

	/**
	 * Array of standard font names.
	 * @protected
	 */
	protected $CoreFonts;

	/**
	 * Array of used fonts.
	 * @protected
	 */
	protected $fonts = array();

	/**
	 * Array of font files.
	 * @protected
	 */
	protected $FontFiles = array();

	/**
	 * Array of encoding differences.
	 * @protected
	 */
	protected $diffs = array();

	/**
	 * Array of used images.
	 * @protected
	 */
	protected $images = array();

	/**
	 * Array of cached files.
	 * @protected
	 */
	protected $cached_files = array();

	/**
	 * Array of Annotations in pages.
	 * @protected
	 */
	protected $PageAnnots = array();

	/**
	 * Array of internal links.
	 * @protected
	 */
	protected $links = array();

	/**
	 * Current font family.
	 * @protected
	 */
	protected $FontFamily;

	/**
	 * Current font style.
	 * @protected
	 */
	protected $FontStyle;

	/**
	 * Current font ascent (distance between font top and baseline).
	 * @protected
	 * @since 2.8.000 (2007-03-29)
	 */
	protected $FontAscent;

	/**
	 * Current font descent (distance between font bottom and baseline).
	 * @protected
	 * @since 2.8.000 (2007-03-29)
	 */
	protected $FontDescent;

	/**
	 * Underlining flag.
	 * @protected
	 */
	protected $underline;

	/**
	 * Overlining flag.
	 * @protected
	 */
	protected $overline;

	/**
	 * Current font info.
	 * @protected
	 */
	protected $CurrentFont;

	/**
	 * Current font size in points.
	 * @protected
	 */
	protected $FontSizePt;

	/**
	 * Current font size in user unit.
	 * @protected
	 */
	protected $FontSize;

	/**
	 * Commands for drawing color.
	 * @protected
	 */
	protected $DrawColor;

	/**
	 * Commands for filling color.
	 * @protected
	 */
	protected $FillColor;

	/**
	 * Commands for text color.
	 * @protected
	 */
	protected $TextColor;

	/**
	 * Indicates whether fill and text colors are different.
	 * @protected
	 */
	protected $ColorFlag;

	/**
	 * Automatic page breaking.
	 * @protected
	 */
	protected $AutoPageBreak;

	/**
	 * Threshold used to trigger page breaks.
	 * @protected
	 */
	protected $PageBreakTrigger;

	/**
	 * Flag set when processing page header.
	 * @protected
	 */
	protected $InHeader = false;

	/**
	 * Flag set when processing page footer.
	 * @protected
	 */
	protected $InFooter = false;

	/**
	 * Zoom display mode.
	 * @protected
	 */
	protected $ZoomMode;

	/**
	 * Layout display mode.
	 * @protected
	 */
	protected $LayoutMode;

	/**
	 * If true set the document information dictionary in Unicode.
	 * @protected
	 */
	protected $docinfounicode = true;

	/**
	 * Document title.
	 * @protected
	 */
	protected $title = '';

	/**
	 * Document subject.
	 * @protected
	 */
	protected $subject = '';

	/**
	 * Document author.
	 * @protected
	 */
	protected $author = '';

	/**
	 * Document keywords.
	 * @protected
	 */
	protected $keywords = '';

	/**
	 * Document creator.
	 * @protected
	 */
	protected $creator = '';

	/**
	 * Starting page number.
	 * @protected
	 */
	protected $starting_page_number = 1;

	/**
	 * The right-bottom (or left-bottom for RTL) corner X coordinate of last inserted image.
	 * @since 2002-07-31
	 * @author Nicola Asuni
	 * @protected
	 */
	protected $img_rb_x;

	/**
	 * The right-bottom corner Y coordinate of last inserted image.
	 * @since 2002-07-31
	 * @author Nicola Asuni
	 * @protected
	 */
	protected $img_rb_y;

	/**
	 * Adjusting factor to convert pixels to user units.
	 * @since 2004-06-14
	 * @author Nicola Asuni
	 * @protected
	 */
	protected $imgscale = 1;

	/**
	 * Boolean flag set to true when the input text is unicode (require unicode fonts).
	 * @since 2005-01-02
	 * @author Nicola Asuni
	 * @protected
	 */
	protected $isunicode = false;

	/**
	 * PDF version.
	 * @since 1.5.3
	 * @protected
	 */
	protected $PDFVersion = '1.7';

	/**
	 * ID of the stored default header template (-1 = not set).
	 * @protected
	 */
	protected $header_xobjid = -1;

	/**
	 * If true reset the Header Xobject template at each page
	 * @protected
	 */
	protected $header_xobj_autoreset = false;

	/**
	 * Minimum distance between header and top page margin.
	 * @protected
	 */
	protected $header_margin;

	/**
	 * Minimum distance between footer and bottom page margin.
	 * @protected
	 */
	protected $footer_margin;

	/**
	 * Original left margin value.
	 * @protected
	 * @since 1.53.0.TC013
	 */
	protected $original_lMargin;

	/**
	 * Original right margin value.
	 * @protected
	 * @since 1.53.0.TC013
	 */
	protected $original_rMargin;

	/**
	 * Default font used on page header.
	 * @protected
	 */
	protected $header_font;

	/**
	 * Default font used on page footer.
	 * @protected
	 */
	protected $footer_font;

	/**
	 * Language templates.
	 * @protected
	 */
	protected $l;

	/**
	 * Barcode to print on page footer (only if set).
	 * @protected
	 */
	protected $barcode = false;

	/**
	 * Boolean flag to print/hide page header.
	 * @protected
	 */
	protected $print_header = true;

	/**
	 * Boolean flag to print/hide page footer.
	 * @protected
	 */
	protected $print_footer = true;

	/**
	 * Header image logo.
	 * @protected
	 */
	protected $header_logo = '';

	/**
	 * Width of header image logo in user units.
	 * @protected
	 */
	protected $header_logo_width = 30;

	/**
	 * Title to be printed on default page header.
	 * @protected
	 */
	protected $header_title = '';

	/**
	 * String to pring on page header after title.
	 * @protected
	 */
	protected $header_string = '';

	/**
	 * Color for header text (RGB array).
	 * @since 5.9.174 (2012-07-25)
	 * @protected
	 */
	protected $header_text_color = array(0,0,0);

	/**
	 * Color for header line (RGB array).
	 * @since 5.9.174 (2012-07-25)
	 * @protected
	 */
	protected $header_line_color = array(0,0,0);

	/**
	 * Color for footer text (RGB array).
	 * @since 5.9.174 (2012-07-25)
	 * @protected
	 */
	protected $footer_text_color = array(0,0,0);

	/**
	 * Color for footer line (RGB array).
	 * @since 5.9.174 (2012-07-25)
	 * @protected
	 */
	protected $footer_line_color = array(0,0,0);

	/**
	 * Text shadow data array.
	 * @since 5.9.174 (2012-07-25)
	 * @protected
	 */
	protected $txtshadow = array('enabled'=>false, 'depth_w'=>0, 'depth_h'=>0, 'color'=>false, 'opacity'=>1, 'blend_mode'=>'Normal');

	/**
	 * Default number of columns for html table.
	 * @protected
	 */
	protected $default_table_columns = 4;

	// variables for html parser

	/**
	 * HTML PARSER: array to store current link and rendering styles.
	 * @protected
	 */
	protected $HREF = array();

	/**
	 * List of available fonts on filesystem.
	 * @protected
	 */
	protected $fontlist = array();

	/**
	 * Current foreground color.
	 * @protected
	 */
	protected $fgcolor;

	/**
	 * HTML PARSER: array of boolean values, true in case of ordered list (OL), false otherwise.
	 * @protected
	 */
	protected $listordered = array();

	/**
	 * HTML PARSER: array count list items on nested lists.
	 * @protected
	 */
	protected $listcount = array();

	/**
	 * HTML PARSER: current list nesting level.
	 * @protected
	 */
	protected $listnum = 0;

	/**
	 * HTML PARSER: indent amount for lists.
	 * @protected
	 */
	protected $listindent = 0;

	/**
	 * HTML PARSER: current list indententation level.
	 * @protected
	 */
	protected $listindentlevel = 0;

	/**
	 * Current background color.
	 * @protected
	 */
	protected $bgcolor;

	/**
	 * Temporary font size in points.
	 * @protected
	 */
	protected $tempfontsize = 10;

	/**
	 * Spacer string for LI tags.
	 * @protected
	 */
	protected $lispacer = '';

	/**
	 * Default encoding.
	 * @protected
	 * @since 1.53.0.TC010
	 */
	protected $encoding = 'UTF-8';

	/**
	 * PHP internal encoding.
	 * @protected
	 * @since 1.53.0.TC016
	 */
	protected $internal_encoding;

	/**
	 * Boolean flag to indicate if the document language is Right-To-Left.
	 * @protected
	 * @since 2.0.000
	 */
	protected $rtl = false;

	/**
	 * Boolean flag used to force RTL or LTR string direction.
	 * @protected
	 * @since 2.0.000
	 */
	protected $tmprtl = false;

	// --- Variables used for document encryption:

	/**
	 * IBoolean flag indicating whether document is protected.
	 * @protected
	 * @since 2.0.000 (2008-01-02)
	 */
	protected $encrypted;

	/**
	 * Array containing encryption settings.
	 * @protected
	 * @since 5.0.005 (2010-05-11)
	 */
	protected $encryptdata = array();

	/**
	 * Last RC4 key encrypted (cached for optimisation).
	 * @protected
	 * @since 2.0.000 (2008-01-02)
	 */
	protected $last_enc_key;

	/**
	 * Last RC4 computed key.
	 * @protected
	 * @since 2.0.000 (2008-01-02)
	 */
	protected $last_enc_key_c;

	/**
	 * File ID (used on document trailer).
	 * @protected
	 * @since 5.0.005 (2010-05-12)
	 */
	protected $file_id;

	// --- bookmark ---

	/**
	 * Outlines for bookmark.
	 * @protected
	 * @since 2.1.002 (2008-02-12)
	 */
	protected $outlines = array();

	/**
	 * Outline root for bookmark.
	 * @protected
	 * @since 2.1.002 (2008-02-12)
	 */
	protected $OutlineRoot;

	// --- javascript and form ---

	/**
	 * Javascript code.
	 * @protected
	 * @since 2.1.002 (2008-02-12)
	 */
	protected $javascript = '';

	/**
	 * Javascript counter.
	 * @protected
	 * @since 2.1.002 (2008-02-12)
	 */
	protected $n_js;

	/**
	 * line through state
	 * @protected
	 * @since 2.8.000 (2008-03-19)
	 */
	protected $linethrough;

	/**
	 * Array with additional document-wide usage rights for the document.
	 * @protected
	 * @since 5.8.014 (2010-08-23)
	 */
	protected $ur = array();

	/**
	 * DPI (Dot Per Inch) Document Resolution (do not change).
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $dpi = 72;

	/**
	 * Array of page numbers were a new page group was started (the page numbers are the keys of the array).
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $newpagegroup = array();

	/**
	 * Array that contains the number of pages in each page group.
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $pagegroups = array();

	/**
	 * Current page group number.
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $currpagegroup = 0;

	/**
	 * Array of transparency objects and parameters.
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $extgstates;

	/**
	 * Set the default JPEG compression quality (1-100).
	 * @protected
	 * @since 3.0.000 (2008-03-27)
	 */
	protected $jpeg_quality;

	/**
	 * Default cell height ratio.
	 * @protected
	 * @since 3.0.014 (2008-05-23)
	 */
	protected $cell_height_ratio = K_CELL_HEIGHT_RATIO;

	/**
	 * PDF viewer preferences.
	 * @protected
	 * @since 3.1.000 (2008-06-09)
	 */
	protected $viewer_preferences;

	/**
	 * A name object specifying how the document should be displayed when opened.
	 * @protected
	 * @since 3.1.000 (2008-06-09)
	 */
	protected $PageMode;

	/**
	 * Array for storing gradient information.
	 * @protected
	 * @since 3.1.000 (2008-06-09)
	 */
	protected $gradients = array();

	/**
	 * Array used to store positions inside the pages buffer (keys are the page numbers).
	 * @protected
	 * @since 3.2.000 (2008-06-26)
	 */
	protected $intmrk = array();

	/**
	 * Array used to store positions inside the pages buffer (keys are the page numbers).
	 * @protected
	 * @since 5.7.000 (2010-08-03)
	 */
	protected $bordermrk = array();

	/**
	 * Array used to store page positions to track empty pages (keys are the page numbers).
	 * @protected
	 * @since 5.8.007 (2010-08-18)
	 */
	protected $emptypagemrk = array();

	/**
	 * Array used to store content positions inside the pages buffer (keys are the page numbers).
	 * @protected
	 * @since 4.6.021 (2009-07-20)
	 */
	protected $cntmrk = array();

	/**
	 * Array used to store footer positions of each page.
	 * @protected
	 * @since 3.2.000 (2008-07-01)
	 */
	protected $footerpos = array();

	/**
	 * Array used to store footer length of each page.
	 * @protected
	 * @since 4.0.014 (2008-07-29)
	 */
	protected $footerlen = array();

	/**
	 * Boolean flag to indicate if a new line is created.
	 * @protected
	 * @since 3.2.000 (2008-07-01)
	 */
	protected $newline = true;

	/**
	 * End position of the latest inserted line.
	 * @protected
	 * @since 3.2.000 (2008-07-01)
	 */
	protected $endlinex = 0;

	/**
	 * PDF string for width value of the last line.
	 * @protected
	 * @since 4.0.006 (2008-07-16)
	 */
	protected $linestyleWidth = '';

	/**
	 * PDF string for CAP value of the last line.
	 * @protected
	 * @since 4.0.006 (2008-07-16)
	 */
	protected $linestyleCap = '0 J';

	/**
	 * PDF string for join value of the last line.
	 * @protected
	 * @since 4.0.006 (2008-07-16)
	 */
	protected $linestyleJoin = '0 j';

	/**
	 * PDF string for dash value of the last line.
	 * @protected
	 * @since 4.0.006 (2008-07-16)
	 */
	protected $linestyleDash = '[] 0 d';

	/**
	 * Boolean flag to indicate if marked-content sequence is open.
	 * @protected
	 * @since 4.0.013 (2008-07-28)
	 */
	protected $openMarkedContent = false;

	/**
	 * Count the latest inserted vertical spaces on HTML.
	 * @protected
	 * @since 4.0.021 (2008-08-24)
	 */
	protected $htmlvspace = 0;

	/**
	 * Array of Spot colors.
	 * @protected
	 * @since 4.0.024 (2008-09-12)
	 */
	protected $spot_colors = array();

	/**
	 * Symbol used for HTML unordered list items.
	 * @protected
	 * @since 4.0.028 (2008-09-26)
	 */
	protected $lisymbol = '';

	/**
	 * String used to mark the beginning and end of EPS image blocks.
	 * @protected
	 * @since 4.1.000 (2008-10-18)
	 */
	protected $epsmarker = 'x#!#EPS#!#x';

	/**
	 * Array of transformation matrix.
	 * @protected
	 * @since 4.2.000 (2008-10-29)
	 */
	protected $transfmatrix = array();

	/**
	 * Current key for transformation matrix.
	 * @protected
	 * @since 4.8.005 (2009-09-17)
	 */
	protected $transfmatrix_key = 0;

	/**
	 * Booklet mode for double-sided pages.
	 * @protected
	 * @since 4.2.000 (2008-10-29)
	 */
	protected $booklet = false;

	/**
	 * Epsilon value used for float calculations.
	 * @protected
	 * @since 4.2.000 (2008-10-29)
	 */
	protected $feps = 0.005;

	/**
	 * Array used for custom vertical spaces for HTML tags.
	 * @protected
	 * @since 4.2.001 (2008-10-30)
	 */
	protected $tagvspaces = array();

	/**
	 * HTML PARSER: custom indent amount for lists. Negative value means disabled.
	 * @protected
	 * @since 4.2.007 (2008-11-12)
	 */
	protected $customlistindent = -1;

	/**
	 * Boolean flag to indicate if the border of the cell sides that cross the page should be removed.
	 * @protected
	 * @since 4.2.010 (2008-11-14)
	 */
	protected $opencell = true;

	/**
	 * Array of files to embedd.
	 * @protected
	 * @since 4.4.000 (2008-12-07)
	 */
	protected $embeddedfiles = array();

	/**
	 * Boolean flag to indicate if we are inside a PRE tag.
	 * @protected
	 * @since 4.4.001 (2008-12-08)
	 */
	protected $premode = false;

	/**
	 * Array used to store positions of graphics transformation blocks inside the page buffer.
	 * keys are the page numbers
	 * @protected
	 * @since 4.4.002 (2008-12-09)
	 */
	protected $transfmrk = array();

	/**
	 * Default color for html links.
	 * @protected
	 * @since 4.4.003 (2008-12-09)
	 */
	protected $htmlLinkColorArray = array(0, 0, 255);

	/**
	 * Default font style to add to html links.
	 * @protected
	 * @since 4.4.003 (2008-12-09)
	 */
	protected $htmlLinkFontStyle = 'U';

	/**
	 * Counts the number of pages.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $numpages = 0;

	/**
	 * Array containing page lengths in bytes.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $pagelen = array();

	/**
	 * Counts the number of pages.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $numimages = 0;

	/**
	 * Store the image keys.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $imagekeys = array();

	/**
	 * Length of the buffer in bytes.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $bufferlen = 0;

	/**
	 * If true enables disk caching.
	 * @protected
	 * @since 4.5.000 (2008-12-31)
	 */
	protected $diskcache = false;

	/**
	 * Counts the number of fonts.
	 * @protected
	 * @since 4.5.000 (2009-01-02)
	 */
	protected $numfonts = 0;

	/**
	 * Store the font keys.
	 * @protected
	 * @since 4.5.000 (2009-01-02)
	 */
	protected $fontkeys = array();

	/**
	 * Store the font object IDs.
	 * @protected
	 * @since 4.8.001 (2009-09-09)
	 */
	protected $font_obj_ids = array();

	/**
	 * Store the fage status (true when opened, false when closed).
	 * @protected
	 * @since 4.5.000 (2009-01-02)
	 */
	protected $pageopen = array();

	/**
	 * Default monospace font.
	 * @protected
	 * @since 4.5.025 (2009-03-10)
	 */
	protected $default_monospaced_font = 'courier';

	/**
	 * Cloned copy of the current class object.
	 * @protected
	 * @since 4.5.029 (2009-03-19)
	 */
	protected $objcopy;

	/**
	 * Array used to store the lengths of cache files.
	 * @protected
	 * @since 4.5.029 (2009-03-19)
	 */
	protected $cache_file_length = array();

	/**
	 * Table header content to be repeated on each new page.
	 * @protected
	 * @since 4.5.030 (2009-03-20)
	 */
	protected $thead = '';

	/**
	 * Margins used for table header.
	 * @protected
	 * @since 4.5.030 (2009-03-20)
	 */
	protected $theadMargins = array();

	/**
	 * Boolean flag to enable document digital signature.
	 * @protected
	 * @since 4.6.005 (2009-04-24)
	 */
	protected $sign = false;

	/**
	 * Digital signature data.
	 * @protected
	 * @since 4.6.005 (2009-04-24)
	 */
	protected $signature_data = array();

	/**
	 * Digital signature max length.
	 * @protected
	 * @since 4.6.005 (2009-04-24)
	 */
	protected $signature_max_length = 11742;

	/**
	 * Data for digital signature appearance.
	 * @protected
	 * @since 5.3.011 (2010-06-16)
	 */
	protected $signature_appearance = array('page' => 1, 'rect' => '0 0 0 0');

	/**
	 * Array of empty digital signature appearances.
	 * @protected
	 * @since 5.9.101 (2011-07-06)
	 */
	protected $empty_signature_appearance = array();

	/**
	 * Regular expression used to find blank characters (required for word-wrapping).
	 * @protected
	 * @since 4.6.006 (2009-04-28)
	 */
	protected $re_spaces = '/[^\S\xa0]/';

	/**
	 * Array of $re_spaces parts.
	 * @protected
	 * @since 5.5.011 (2010-07-09)
	 */
	protected $re_space = array('p' => '[^\S\xa0]', 'm' => '');

	/**
	 * Digital signature object ID.
	 * @protected
	 * @since 4.6.022 (2009-06-23)
	 */
	protected $sig_obj_id = 0;

	/**
	 * ID of page objects.
	 * @protected
	 * @since 4.7.000 (2009-08-29)
	 */
	protected $page_obj_id = array();

	/**
	 * List of form annotations IDs.
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $form_obj_id = array();

	/**
	 * Deafult Javascript field properties. Possible values are described on official Javascript for Acrobat API reference. Annotation options can be directly specified using the 'aopt' entry.
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $default_form_prop = array('lineWidth'=>1, 'borderStyle'=>'solid', 'fillColor'=>array(255, 255, 255), 'strokeColor'=>array(128, 128, 128));

	/**
	 * Javascript objects array.
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $js_objects = array();

	/**
	 * Current form action (used during XHTML rendering).
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $form_action = '';

	/**
	 * Current form encryption type (used during XHTML rendering).
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $form_enctype = 'application/x-www-form-urlencoded';

	/**
	 * Current method to submit forms.
	 * @protected
	 * @since 4.8.000 (2009-09-07)
	 */
	protected $form_mode = 'post';

	/**
	 * List of fonts used on form fields (fontname => fontkey).
	 * @protected
	 * @since 4.8.001 (2009-09-09)
	 */
	protected $annotation_fonts = array();

	/**
	 * List of radio buttons parent objects.
	 * @protected
	 * @since 4.8.001 (2009-09-09)
	 */
	protected $radiobutton_groups = array();

	/**
	 * List of radio group objects IDs.
	 * @protected
	 * @since 4.8.001 (2009-09-09)
	 */
	protected $radio_groups = array();

	/**
	 * Text indentation value (used for text-indent CSS attribute).
	 * @protected
	 * @since 4.8.006 (2009-09-23)
	 */
	protected $textindent = 0;

	/**
	 * Store page number when startTransaction() is called.
	 * @protected
	 * @since 4.8.006 (2009-09-23)
	 */
	protected $start_transaction_page = 0;

	/**
	 * Store Y position when startTransaction() is called.
	 * @protected
	 * @since 4.9.001 (2010-03-28)
	 */
	protected $start_transaction_y = 0;

	/**
	 * True when we are printing the thead section on a new page.
	 * @protected
	 * @since 4.8.027 (2010-01-25)
	 */
	protected $inthead = false;

	/**
	 * Array of column measures (width, space, starting Y position).
	 * @protected
	 * @since 4.9.001 (2010-03-28)
	 */
	protected $columns = array();

	/**
	 * Number of colums.
	 * @protected
	 * @since 4.9.001 (2010-03-28)
	 */
	protected $num_columns = 1;

	/**
	 * Current column number.
	 * @protected
	 * @since 4.9.001 (2010-03-28)
	 */
	protected $current_column = 0;

	/**
	 * Starting page for columns.
	 * @protected
	 * @since 4.9.001 (2010-03-28)
	 */
	protected $column_start_page = 0;

	/**
	 * Maximum page and column selected.
	 * @protected
	 * @since 5.8.000 (2010-08-11)
	 */
	protected $maxselcol = array('page' => 0, 'column' => 0);

	/**
	 * Array of: X difference between table cell x start and starting page margin, cellspacing, cellpadding.
	 * @protected
	 * @since 5.8.000 (2010-08-11)
	 */
	protected $colxshift = array('x' => 0, 's' => array('H' => 0, 'V' => 0), 'p' => array('L' => 0, 'T' => 0, 'R' => 0, 'B' => 0));

	/**
	 * Text rendering mode: 0 = Fill text; 1 = Stroke text; 2 = Fill, then stroke text; 3 = Neither fill nor stroke text (invisible); 4 = Fill text and add to path for clipping; 5 = Stroke text and add to path for clipping; 6 = Fill, then stroke text and add to path for clipping; 7 = Add text to path for clipping.
	 * @protected
	 * @since 4.9.008 (2010-04-03)
	 */
	protected $textrendermode = 0;

	/**
	 * Text stroke width in doc units.
	 * @protected
	 * @since 4.9.008 (2010-04-03)
	 */
	protected $textstrokewidth = 0;

	/**
	 * Current stroke color.
	 * @protected
	 * @since 4.9.008 (2010-04-03)
	 */
	protected $strokecolor;

	/**
	 * Default unit of measure for document.
	 * @protected
	 * @since 5.0.000 (2010-04-22)
	 */
	protected $pdfunit = 'mm';

	/**
	 * Boolean flag true when we are on TOC (Table Of Content) page.
	 * @protected
	 */
	protected $tocpage = false;

	/**
	 * Boolean flag: if true convert vector images (SVG, EPS) to raster image using GD or ImageMagick library.
	 * @protected
	 * @since 5.0.000 (2010-04-26)
	 */
	protected $rasterize_vector_images = false;

	/**
	 * Boolean flag: if true enables font subsetting by default.
	 * @protected
	 * @since 5.3.002 (2010-06-07)
	 */
	protected $font_subsetting = true;

	/**
	 * Array of default graphic settings.
	 * @protected
	 * @since 5.5.008 (2010-07-02)
	 */
	protected $default_graphic_vars = array();

	/**
	 * Array of XObjects.
	 * @protected
	 * @since 5.8.014 (2010-08-23)
	 */
	protected $xobjects = array();

	/**
	 * Boolean value true when we are inside an XObject.
	 * @protected
	 * @since 5.8.017 (2010-08-24)
	 */
	protected $inxobj = false;

	/**
	 * Current XObject ID.
	 * @protected
	 * @since 5.8.017 (2010-08-24)
	 */
	protected $xobjid = '';

	/**
	 * Percentage of character stretching.
	 * @protected
	 * @since 5.9.000 (2010-09-29)
	 */
	protected $font_stretching = 100;

	/**
	 * Increases or decreases the space between characters in a text by the specified amount (tracking).
	 * @protected
	 * @since 5.9.000 (2010-09-29)
	 */
	protected $font_spacing = 0;

	/**
	 * Array of no-write regions.
	 * ('page' => page number or empy for current page, 'xt' => X top, 'yt' => Y top, 'xb' => X bottom, 'yb' => Y bottom, 'side' => page side 'L' = left or 'R' = right)
	 * @protected
	 * @since 5.9.003 (2010-10-14)
	 */
	protected $page_regions = array();

	/**
	 * Boolean value true when page region check is active.
	 * @protected
	 */
	protected $check_page_regions = true;

	/**
	 * Array of PDF layers data.
	 * @protected
	 * @since 5.9.102 (2011-07-13)
	 */
	protected $pdflayers = array();

	/**
	 * A dictionary of names and corresponding destinations (Dests key on document Catalog).
	 * @protected
	 * @since 5.9.097 (2011-06-23)
	 */
	protected $dests = array();

	/**
	 * Object ID for Named Destinations
	 * @protected
	 * @since 5.9.097 (2011-06-23)
	 */
	protected $n_dests;

	/**
	 * Embedded Files Names
	 * @protected
	 * @since 5.9.204 (2013-01-23)
	 */
	protected $efnames = array();

	/**
	 * Directory used for the last SVG image.
	 * @protected
	 * @since 5.0.000 (2010-05-05)
	 */
	protected $svgdir = '';

	/**
	 *  Deafult unit of measure for SVG.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgunit = 'px';

	/**
	 * Array of SVG gradients.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svggradients = array();

	/**
	 * ID of last SVG gradient.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svggradientid = 0;

	/**
	 * Boolean value true when in SVG defs group.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgdefsmode = false;

	/**
	 * Array of SVG defs.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgdefs = array();

	/**
	 * Boolean value true when in SVG clipPath tag.
	 * @protected
	 * @since 5.0.000 (2010-04-26)
	 */
	protected $svgclipmode = false;

	/**
	 * Array of SVG clipPath commands.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgclippaths = array();

	/**
	 * Array of SVG clipPath tranformation matrix.
	 * @protected
	 * @since 5.8.022 (2010-08-31)
	 */
	protected $svgcliptm = array();

	/**
	 * ID of last SVG clipPath.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgclipid = 0;

	/**
	 * SVG text.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgtext = '';

	/**
	 * SVG text properties.
	 * @protected
	 * @since 5.8.013 (2010-08-23)
	 */
	protected $svgtextmode = array();

	/**
	 * Array of SVG properties.
	 * @protected
	 * @since 5.0.000 (2010-05-02)
	 */
	protected $svgstyles = array(array(
		'alignment-baseline' => 'auto',
		'baseline-shift' => 'baseline',
		'clip' => 'auto',
		'clip-path' => 'none',
		'clip-rule' => 'nonzero',
		'color' => 'black',
		'color-interpolation' => 'sRGB',
		'color-interpolation-filters' => 'linearRGB',
		'color-profile' => 'auto',
		'color-rendering' => 'auto',
		'cursor' => 'auto',
		'direction' => 'ltr',
		'display' => 'inline',
		'dominant-baseline' => 'auto',
		'enable-background' => 'accumulate',
		'fill' => 'black',
		'fill-opacity' => 1,
		'fill-rule' => 'nonzero',
		'filter' => 'none',
		'flood-color' => 'black',
		'flood-opacity' => 1,
		'font' => '',
		'font-family' => 'helvetica',
		'font-size' => 'medium',
		'font-size-adjust' => 'none',
		'font-stretch' => 'normal',
		'font-style' => 'normal',
		'font-variant' => 'normal',
		'font-weight' => 'normal',
		'glyph-orientation-horizontal' => '0deg',
		'glyph-orientation-vertical' => 'auto',
		'image-rendering' => 'auto',
		'kerning' => 'auto',
		'letter-spacing' => 'normal',
		'lighting-color' => 'white',
		'marker' => '',
		'marker-end' => 'none',
		'marker-mid' => 'none',
		'marker-start' => 'none',
		'mask' => 'none',
		'opacity' => 1,
		'overflow' => 'auto',
		'pointer-events' => 'visiblePainted',
		'shape-rendering' => 'auto',
		'stop-color' => 'black',
		'stop-opacity' => 1,
		'stroke' => 'none',
		'stroke-dasharray' => 'none',
		'stroke-dashoffset' => 0,
		'stroke-linecap' => 'butt',
		'stroke-linejoin' => 'miter',
		'stroke-miterlimit' => 4,
		'stroke-opacity' => 1,
		'stroke-width' => 1,
		'text-anchor' => 'start',
		'text-decoration' => 'none',
		'text-rendering' => 'auto',
		'unicode-bidi' => 'normal',
		'visibility' => 'visible',
		'word-spacing' => 'normal',
		'writing-mode' => 'lr-tb',
		'text-color' => 'black',
		'transfmatrix' => array(1, 0, 0, 1, 0, 0)
		));

	/**
	 * If true force sRGB color profile for all document.
	 * @protected
	 * @since 5.9.121 (2011-09-28)
	 */
	protected $force_srgb = false;

	/**
	 * If true set the document to PDF/A mode.
	 * @protected
	 * @since 5.9.121 (2011-09-27)
	 */
	protected $pdfa_mode = false;

	/**
	 * Document creation date-time
	 * @protected
	 * @since 5.9.152 (2012-03-22)
	 */
	protected $doc_creation_timestamp;

	/**
	 * Document modification date-time
	 * @protected
	 * @since 5.9.152 (2012-03-22)
	 */
	protected $doc_modification_timestamp;

	/**
	 * Custom XMP data.
	 * @protected
	 * @since 5.9.128 (2011-10-06)
	 */
	protected $custom_xmp = '';

	/**
	 * Overprint mode array.
	 * (Check the "Entries in a Graphics State Parameter Dictionary" on PDF 32000-1:2008).
	 * @protected
	 * @since 5.9.152 (2012-03-23)
	 */
	protected $overprint = array('OP' => false, 'op' => false, 'OPM' => 0);

	/**
	 * Alpha mode array.
	 * (Check the "Entries in a Graphics State Parameter Dictionary" on PDF 32000-1:2008).
	 * @protected
	 * @since 5.9.152 (2012-03-23)
	 */
	protected $alpha = array('CA' => 1, 'ca' => 1, 'BM' => '/Normal', 'AIS' => false);

	/**
	 * Define the page boundaries boxes to be set on document.
	 * @protected
	 * @since 5.9.152 (2012-03-23)
	 */
	protected $page_boxes = array('MediaBox', 'CropBox', 'BleedBox', 'TrimBox', 'ArtBox');

	/**
	 * If true print TCPDF meta link.
	 * @protected
	 * @since 5.9.152 (2012-03-23)
	 */
	protected $tcpdflink = true;

	/**
	 * Cache array for computed GD gamma values.
	 * @protected
	 * @since 5.9.1632 (2012-06-05)
	 */
	protected $gdgammacache = array();

	//------------------------------------------------------------
	// METHODS
	//------------------------------------------------------------

	/**
	 * This is the class constructor.
	 * It allows to set up the page format, the orientation and the measure unit used in all the methods (except for the font sizes).
	 * 
	 * IMPORTANT: Please note that this method sets the mb_internal_encoding to ASCII, so if you are using the mbstring module functions with TCPDF you need to correctly set/unset the mb_internal_encoding when needed.
	 * 
	 * @param $orientation (string) page orientation. Possible values are (case insensitive):<ul><li>P or Portrait (default)</li><li>L or Landscape</li><li>'' (empty string) for automatic orientation</li></ul>
	 * @param $unit (string) User measure unit. Possible values are:<ul><li>pt: point</li><li>mm: millimeter (default)</li><li>cm: centimeter</li><li>in: inch</li></ul><br />A point equals 1/72 of inch, that is to say about 0.35 mm (an inch being 2.54 cm). This is a very common unit in typography; font sizes are expressed in that unit.
	 * @param $format (mixed) The format used for pages. It can be either: one of the string values specified at getPageSizeFromFormat() or an array of parameters specified at setPageFormat().
	 * @param $unicode (boolean) TRUE means that the input text is unicode (default = true)
	 * @param $encoding (string) Charset encoding (used only when converting back html entities); default is UTF-8.
	 * @param $diskcache (boolean) If TRUE reduce the RAM memory usage by caching temporary data on filesystem (slower).
	 * @param $pdfa (boolean) If TRUE set the document to PDF/A mode.
	 * @public
	 * @see getPageSizeFromFormat(), setPageFormat()
	 */
	public function __construct($orientation='P', $unit='mm', $format='A4', $unicode=true, $encoding='UTF-8', $diskcache=false, $pdfa=false) {
		/* Set internal character encoding to ASCII */
		if (function_exists('mb_internal_encoding') AND mb_internal_encoding()) {
			$this->internal_encoding = mb_internal_encoding();
			mb_internal_encoding('ASCII');
		}
		$this->font_obj_ids = array();
		$this->page_obj_id = array();
		$this->form_obj_id = array();
		// set pdf/a mode
		$this->pdfa_mode = $pdfa;
		$this->force_srgb = false;
		// set disk caching
		$this->diskcache = $diskcache ? true : false;
		// set language direction
		$this->rtl = false;
		$this->tmprtl = false;
		// some checks
		$this->_dochecks();
		// initialization of properties
		$this->isunicode = $unicode;
		$this->page = 0;
		$this->transfmrk[0] = array();
		$this->pagedim = array();
		$this->n = 2;
		$this->buffer = '';
		$this->pages = array();
		$this->state = 0;
		$this->fonts = array();
		$this->FontFiles = array();
		$this->diffs = array();
		$this->images = array();
		$this->links = array();
		$this->gradients = array();
		$this->InFooter = false;
		$this->lasth = 0;
		$this->FontFamily = defined('PDF_FONT_NAME_MAIN')?PDF_FONT_NAME_MAIN:'helvetica';
		$this->FontStyle = '';
		$this->FontSizePt = 12;
		$this->underline = false;
		$this->overline = false;
		$this->linethrough = false;
		$this->DrawColor = '0 G';
		$this->FillColor = '0 g';
		$this->TextColor = '0 g';
		$this->ColorFlag = false;
		$this->pdflayers = array();
		// encryption values
		$this->encrypted = false;
		$this->last_enc_key = '';
		// standard Unicode fonts
		$this->CoreFonts = array(
			'courier'=>'Courier',
			'courierB'=>'Courier-Bold',
			'courierI'=>'Courier-Oblique',
			'courierBI'=>'Courier-BoldOblique',
			'helvetica'=>'Helvetica',
			'helveticaB'=>'Helvetica-Bold',
			'helveticaI'=>'Helvetica-Oblique',
			'helveticaBI'=>'Helvetica-BoldOblique',
			'times'=>'Times-Roman',
			'timesB'=>'Times-Bold',
			'timesI'=>'Times-Italic',
			'timesBI'=>'Times-BoldItalic',
			'symbol'=>'Symbol',
			'zapfdingbats'=>'ZapfDingbats'
		);
		// set scale factor
		$this->setPageUnit($unit);
		// set page format and orientation
		$this->setPageFormat($format, $orientation);
		// page margins (1 cm)
		$margin = 28.35 / $this->k;
		$this->SetMargins($margin, $margin);
		$this->clMargin = $this->lMargin;
		$this->crMargin = $this->rMargin;
		// internal cell padding
		$cpadding = $margin / 10;
		$this->setCellPaddings($cpadding, 0, $cpadding, 0);
		// cell margins
		$this->setCellMargins(0, 0, 0, 0);
		// line width (0.2 mm)
		$this->LineWidth = 0.57 / $this->k;
		$this->linestyleWidth = sprintf('%F w', ($this->LineWidth * $this->k));
		$this->linestyleCap = '0 J';
		$this->linestyleJoin = '0 j';
		$this->linestyleDash = '[] 0 d';
		// automatic page break
		$this->SetAutoPageBreak(true, (2 * $margin));
		// full width display mode
		$this->SetDisplayMode('fullwidth');
		// compression
		$this->SetCompression();
		// set default PDF version number
		$this->setPDFVersion();
		$this->tcpdflink = true;
		$this->encoding = $encoding;
		$this->HREF = array();
		$this->getFontsList();
		$this->fgcolor = array('R' => 0, 'G' => 0, 'B' => 0);
		$this->strokecolor = array('R' => 0, 'G' => 0, 'B' => 0);
		$this->bgcolor = array('R' => 255, 'G' => 255, 'B' => 255);
		$this->extgstates = array();
		$this->setTextShadow();
		// user's rights
		$this->sign = false;
		$this->ur['enabled'] = false;
		$this->ur['document'] = '/FullSave';
		$this->ur['annots'] = '/Create/Delete/Modify/Copy/Import/Export';
		$this->ur['form'] = '/Add/Delete/FillIn/Import/Export/SubmitStandalone/SpawnTemplate';
		$this->ur['signature'] = '/Modify';
		$this->ur['ef'] = '/Create/Delete/Modify/Import';
		$this->ur['formex'] = '';
		$this->signature_appearance = array('page' => 1, 'rect' => '0 0 0 0', 'name' => 'Signature');
		$this->empty_signature_appearance = array();
		// set default JPEG quality
		$this->jpeg_quality = 75;
		// initialize some settings
		TCPDF_FONTS::utf8Bidi(array(''), '', false, $this->isunicode, $this->CurrentFont);
		// set default font
		$this->SetFont($this->FontFamily, $this->FontStyle, $this->FontSizePt);
		// check if PCRE Unicode support is enabled
		if ($this->isunicode AND (@preg_match('/\pL/u', 'a') == 1)) {
			// PCRE unicode support is turned ON
			// \p{Z} or \p{Separator}: any kind of Unicode whitespace or invisible separator.
			// \p{Lo} or \p{Other_Letter}: a Unicode letter or ideograph that does not have lowercase and uppercase variants.
			// \p{Lo} is needed because Chinese characters are packed next to each other without spaces in between.
			//$this->setSpacesRE('/[^\S\P{Z}\P{Lo}\xa0]/u');
			$this->setSpacesRE('/[^\S\P{Z}\xa0]/u');
		} else {
			// PCRE unicode support is turned OFF
			$this->setSpacesRE('/[^\S\xa0]/');
		}
		$this->default_form_prop = array('lineWidth'=>1, 'borderStyle'=>'solid', 'fillColor'=>array(255, 255, 255), 'strokeColor'=>array(128, 128, 128));
		// set file ID for trailer
		$serformat = (is_array($format) ? serialize($format) : $format);
		$this->file_id = md5(TCPDF_STATIC::getRandomSeed('TCPDF'.$orientation.$unit.$serformat.$encoding));
		// set document creation and modification timestamp
		$this->doc_creation_timestamp = time();
		$this->doc_modification_timestamp = $this->doc_creation_timestamp;
		// get default graphic vars
		$this->default_graphic_vars = $this->getGraphicVars();
		$this->header_xobj_autoreset = false;
		$this->custom_xmp = '';
	}

	/**
	 * Default destructor.
	 * @public
	 * @since 1.53.0.TC016
	 */
	public function __destruct() {
		// restore internal encoding
		if (isset($this->internal_encoding) AND !empty($this->internal_encoding)) {
			mb_internal_encoding($this->internal_encoding);
		}
		// unset all class variables
		$this->_destroy(true);
	}

	/**
	 * Set the units of measure for the document.
	 * @param $unit (string) User measure unit. Possible values are:<ul><li>pt: point</li><li>mm: millimeter (default)</li><li>cm: centimeter</li><li>in: inch</li></ul><br />A point equals 1/72 of inch, that is to say about 0.35 mm (an inch being 2.54 cm). This is a very common unit in typography; font sizes are expressed in that unit.
	 * @public
	 * @since 3.0.015 (2008-06-06)
	 */
	public function setPageUnit($unit) {
		$unit = strtolower($unit);
		//Set scale factor
		switch ($unit) {
			// points
			case 'px':
			case 'pt': {
				$this->k = 1;
				break;
			}
			// millimeters
			case 'mm': {
				$this->k = $this->dpi / 25.4;
				break;
			}
			// centimeters
			case 'cm': {
				$this->k = $this->dpi / 2.54;
				break;
			}
			// inches
			case 'in': {
				$this->k = $this->dpi;
				break;
			}
			// unsupported unit
			default : {
				$this->Error('Incorrect unit: '.$unit);
				break;
			}
		}
		$this->pdfunit = $unit;
		if (isset($this…

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