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/**
* Buffer.php
*
* @since 2011-05-23
* @category Library
* @package PdfFont
* @author Nicola Asuni <info@tecnick.com>
* @copyright 2011-2015 Nicola Asuni - Tecnick.com LTD
* @license http://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE.TXT)
* @link https://github.com/tecnickcom/tc-lib-pdf-font
*
* This file is part of tc-lib-pdf-font software library.
*/
namespace Com\Tecnick\Pdf\Font;
use \Com\Tecnick\Pdf\Font\Font;
use \Com\Tecnick\Pdf\Font\Exception as FontException;
/**
* Com\Tecnick\Pdf\Font\Buffer
*
* @since 2011-05-23
* @category Library
* @package PdfFont
* @author Nicola Asuni <info@tecnick.com>
* @copyright 2011-2015 Nicola Asuni - Tecnick.com LTD
* @license http://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE.TXT)
* @link https://github.com/tecnickcom/tc-lib-pdf-font
*/
abstract class Buffer
{
/**
* Array containing all fonts data
*
* @var array
*/
protected $font = array();
/**
* Font counter
*
* @var int
*/
protected $numfonts = 0;
/**
* Array containing encoding differences
*
* @var array
*/
protected $encdiff = array();
/**
* Index for Encoding differences
*
* @var int
*/
protected $numdiffs = 0;
/**
* Array containing font definitions grouped by file
*
* @var array
*/
protected $file = array();
/**
* Default subset mode
*
* @var bool
*/
protected $subset = false;
/**
* True if we are in Unicode mode, False otherwhise.
*
* @var bool
*/
protected $unicode = true;
/**
* True if we are in PDF/A mode.
*
* @var bool
*/
protected $pdfa = false;
/**
* Unit of measure conversion ratio
*
* @var float
*/
protected $kunit = 1.0;
/**
* Initialize fonts buffer
*
* @param float $kunit Unit of measure conversion ratio.
* @param bool $subset If true embedd only a subset of the fonts
* (stores only the information related to the used characters);
* If false embedd full font;
* This option is valid only for TrueTypeUnicode fonts and it is disabled for PDF/A.
* If you want to enable users to modify the document, set this parameter to false.
* If you subset the font, the person who receives your PDF would need to have
* your same font in order to make changes to your PDF.
* The file size of the PDF would also be smaller because you are embedding only a subset.
* NOTE: This option is computational and memory intensive.
* @param bool $unicode True if we are in Unicode mode, False otherwhise.
* @param bool $pdfa True if we are in PDF/A mode.
*
* @return string Font key
*
* @throws FontException in case of error
*/
public function __construct($kunit, $subset = false, $unicode = true, $pdfa = false)
{
$this->kunit = (float) $kunit;
$this->subset = (bool) $subset;
$this->unicode = (bool) $unicode;
$this->pdfa = (bool) $pdfa;
}
/**
* Get the default subset mode
*
* @return bool
*/
public function isSubsetMode()
{
return $this->subset;
}
/**
* Returns the fonts buffer
*
* @return array
*/
public function getFonts()
{
return $this->font;
}
/**
* Returns the fonts buffer
*
* @return array
*/
public function getEncDiffs()
{
return $this->encdiff;
}
/**
* Returns true if the specified font key exist on buffer
*
* @param string $key Font key
*
* @return bool
*/
public function isValidKey($key)
{
return isset($this->font[$key]);
}
/**
* Get font by key
*
* @param string $key Font key
*
* @return array|bool Returns the fonts array of palse in case of missing font.
*
* @throws FontException in case of error
*/
public function getFont($key)
{
if (!isset($this->font[$key])) {
throw new FontException('The font '.$key.' has not been loaded');
}
return $this->font[$key];
}
/**
* Set font sub-key value
*
* @param int $key The font key
* @param int $subkey Font sub-key
* @param mixed $data The data to set
*/
public function setFontSubKey($key, $subkey, $data)
{
if (!isset($this->font[$key])) {
$this->font[$key] = array();
}
$this->font[$key][$subkey] = $data;
}
/**
* Add a character to the subset list
*
* @param int $key The font key
* @param int $char The Unicode character value to add
*/
public function addSubsetChar($key, $char)
{
$this->font[$key]['subsetchars'][$char] = true;
}
/**
* Add a new font to the fonts buffer
*
* The definition file (and the font file itself when embedding) must be present either in the current directory
* or in the one indicated by K_PATH_FONTS if the constant is defined.
*
* @param int $objnum Current PDF object number
* @param string $font Font family.
* If it is a standard family name, it will override the corresponding font.
* @param string $style Font style.
* Possible values are (case insensitive):
* regular (default)
* B: bold
* I: italic
* U: underline
* D: strikeout (linethrough)
* O: overline
* @param string $ifile The font definition file (or empty for autodetect).
* By default, the name is built from the family and style, in lower case with no spaces.
* @param bool $subset If true embedd only a subset of the font
* (stores only the information related to the used characters);
* If false embedd full font;
* This option is valid only for TrueTypeUnicode fonts and it is disabled for PDF/A.
* If you want to enable users to modify the document, set this parameter to false.
* If you subset the font, the person who receives your PDF would need to have
* your same font in order to make changes to your PDF.
* The file size of the PDF would also be smaller because you are embedding only a subset.
* Set this to null to use the default value.
* NOTE: This option is computational and memory intensive.
*
* @return string Font key
*
* @throws FontException in case of error
*/
public function add(&$objnum, $font, $style = '', $ifile = '', $subset = null)
{
if ($subset === null) {
$subset = $this->subset;
}
$fobj = new Font($font, $style, $ifile, $subset, $this->unicode, $this->pdfa);
$key = $fobj->getFontkey();
if (isset($this->font[$key])) {
return $key;
}
$fobj->load();
$this->font[$key] = $fobj->getFontData();
$this->setFontFile($key);
$this->setFontDiff($key);
$this->font[$key]['i'] = $this->numfonts++;
$this->font[$key]['n'] = ++$objnum;
return $key;
}
/**
* Set font file and subset
*
* @param string $key Font key
*/
protected function setFontFile($key)
{
if (empty($this->font[$key]['file'])) {
return;
}
$file = $this->font[$key]['file'];
if (!isset($this->file[$file])) {
$this->file[$file] = array('keys' => array());
}
if (!in_array($key, $this->file[$file]['keys'])) {
$this->file[$file]['keys'][] = $key;
}
$this->file[$file]['dir'] = $this->font[$key]['dir'];
$this->file[$file]['length1'] = $this->font[$key]['length1'];
$this->file[$file]['length2'] = $this->font[$key]['length2'];
if (!isset($this->file[$file]['subset'])) {
$this->file[$file]['subset'] = true;
}
$this->file[$file]['subset'] = ($this->file[$file]['subset'] && $this->font[$key]['subset']);
}
/**
* Set font diff
*
* @param string $key Font key
*/
protected function setFontDiff($key)
{
if (empty($this->font[$key]['diff'])) {
return;
}
$diffid = array_search($this->font[$key]['diff'], $this->encdiff);
if ($diffid === false) {
$diffid = ++$this->numdiffs;
$this->encdiff[$diffid] = $this->font[$key]['diff'];
}
$this->font[$key]['diffid'] = $diffid;
}
}