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<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Simple.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Internally used classes */
require_once 'Zend/Pdf/Element/Name.php';
/** Zend_Pdf_Resource_Font */
require_once 'Zend/Pdf/Resource/Font.php';
/**
* Adobe PDF Simple fonts implementation
*
* PDF simple fonts functionality is presented by Adobe Type 1
* (including standard PDF Type1 built-in fonts) and TrueType fonts support.
*
* Both fonts have the following properties:
* - Glyphs in the font are selected by single-byte character codes obtained from a
* string that is shown by the text-showing operators. Logically, these codes index
* into a table of 256 glyphs; the mapping from codes to glyphs is called the font’s
* encoding.
* PDF specification provides a possibility to specify any user defined encoding in addition
* to the standard built-in encodings: Standard-Encoding, MacRomanEncoding, WinAnsiEncoding,
* and PDFDocEncoding, but Zend_Pdf simple fonts implementation operates only with
* Windows ANSI encoding (except Symbol and ZapfDingbats built-in fonts).
*
* - Each glyph has a single set of metrics, including a horizontal displacement or
* width. That is, simple fonts support only horizontal writing mode.
*
*
* The code in this class is common to both types. However, you will only deal
* directly with subclasses.
*
* Font objects should be normally be obtained from the factory methods
* {@link Zend_Pdf_Font::fontWithName} and {@link Zend_Pdf_Font::fontWithPath}.
*
* @package Zend_Pdf
* @subpackage Fonts
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
abstract class Zend_Pdf_Resource_Font_Simple extends Zend_Pdf_Resource_Font
{
/**
* Object representing the font's cmap (character to glyph map).
* @var Zend_Pdf_Cmap
*/
protected $_cmap = null;
/**
* Array containing the widths of each of the glyphs contained in the font.
*
* Keys are integers starting from 0, which coresponds to Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH.
*
* Font character map may contain gaps for actually used glyphs, nevertheless glyphWidths array
* contains widths for all glyphs even they are unused.
*
* @var array
*/
protected $_glyphWidths = null;
/**
* Width for glyphs missed in the font
*
* Note: Adobe PDF specfication (V1.4 - V1.6) doesn't define behavior for rendering
* characters missed in the standard PDF fonts (such us 0x7F (DEL) Windows ANSI code)
* Adobe Font Metrics files doesn't also define metrics for "missed glyph".
* We provide character width as "0" for this case, but actually it depends on PDF viewer
* implementation.
*
* @var integer
*/
protected $_missingGlyphWidth = 0;
/**** Public Interface ****/
/* Object Lifecycle */
/**
* Object constructor
*
*/
public function __construct()
{
parent::__construct();
/**
* @todo
* It's easy to add other encodings support now (Standard-Encoding, MacRomanEncoding,
* PDFDocEncoding, MacExpertEncoding, Symbol, and ZapfDingbats).
* Steps for the implementation:
* - completely describe all PDF single byte encodings in the documentation
* - implement non-WinAnsi encodings processing into encodeString()/decodeString() methods
*
* These encodings will be automatically supported for standard builtin PDF fonts as well
* as for external fonts.
*/
$this->_resource->Encoding = new Zend_Pdf_Element_Name('WinAnsiEncoding');
}
/**
* Returns an array of glyph numbers corresponding to the Unicode characters.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumberForCharacter()}.
*
* @param array $characterCodes Array of Unicode character codes (code points).
* @return array Array of glyph numbers.
*/
public function glyphNumbersForCharacters($characterCodes)
{
return $this->_cmap->glyphNumbersForCharacters($characterCodes);
}
/**
* Returns the glyph number corresponding to the Unicode character.
*
* If a particular character doesn't exist in this font, the special 'missing
* character glyph' will be substituted.
*
* See also {@link glyphNumbersForCharacters()} which is optimized for bulk
* operations.
*
* @param integer $characterCode Unicode character code (code point).
* @return integer Glyph number.
*/
public function glyphNumberForCharacter($characterCode)
{
return $this->_cmap->glyphNumberForCharacter($characterCode);
}
/**
* Returns a number between 0 and 1 inclusive that indicates the percentage
* of characters in the string which are covered by glyphs in this font.
*
* Since no one font will contain glyphs for the entire Unicode character
* range, this method can be used to help locate a suitable font when the
* actual contents of the string are not known.
*
* Note that some fonts lie about the characters they support. Additionally,
* fonts don't usually contain glyphs for control characters such as tabs
* and line breaks, so it is rare that you will get back a full 1.0 score.
* The resulting value should be considered informational only.
*
* @param string $string
* @param string $charEncoding (optional) Character encoding of source text.
* If omitted, uses 'current locale'.
* @return float
*/
public function getCoveredPercentage($string, $charEncoding = '')
{
/* Convert the string to UTF-16BE encoding so we can match the string's
* character codes to those found in the cmap.
*/
if ($charEncoding != 'UTF-16BE') {
if (PHP_OS != 'AIX') { // AIX doesnt know what UTF-16BE is
$string = iconv($charEncoding, 'UTF-16BE', $string);
}
}
$charCount = (PHP_OS != 'AIX') ? iconv_strlen($string, 'UTF-16BE') : strlen($string);
if ($charCount == 0) {
return 0;
}
/* Fetch the covered character code list from the font's cmap.
*/
$coveredCharacters = $this->_cmap->getCoveredCharacters();
/* Calculate the score by doing a lookup for each character.
*/
$score = 0;
$maxIndex = strlen($string);
for ($i = 0; $i < $maxIndex; $i++) {
/**
* @todo Properly handle characters encoded as surrogate pairs.
*/
$charCode = (ord($string[$i]) << 8) | ord($string[++$i]);
/* This could probably be optimized a bit with a binary search...
*/
if (in_array($charCode, $coveredCharacters)) {
$score++;
}
}
return $score / $charCount;
}
/**
* Returns the widths of the glyphs.
*
* The widths are expressed in the font's glyph space. You are responsible
* for converting to user space as necessary. See {@link unitsPerEm()}.
*
* See also {@link widthForGlyph()}.
*
* @param array &$glyphNumbers Array of glyph numbers.
* @return array Array of glyph widths (integers).
*/
public function widthsForGlyphs($glyphNumbers)
{
$widths = array();
foreach ($glyphNumbers as $key => $glyphNumber) {
if (!isset($this->_glyphWidths[$glyphNumber])) {
$widths[$key] = $this->_missingGlyphWidth;
} else {
$widths[$key] = $this->_glyphWidths[$glyphNumber];
}
}
return $widths;
}
/**
* Returns the width of the glyph.
*
* Like {@link widthsForGlyphs()} but used for one glyph at a time.
*
* @param integer $glyphNumber
* @return integer
*/
public function widthForGlyph($glyphNumber)
{
if (!isset($this->_glyphWidths[$glyphNumber])) {
return $this->_missingGlyphWidth;
}
return $this->_glyphWidths[$glyphNumber];
}
/**
* Convert string to the font encoding.
*
* The method is used to prepare string for text drawing operators
*
* @param string $string
* @param string $charEncoding Character encoding of source text.
* @return string
*/
public function encodeString($string, $charEncoding)
{
if (PHP_OS == 'AIX') {
return $string; // returning here b/c AIX doesnt know what CP1252 is
}
return iconv($charEncoding, 'CP1252//IGNORE', $string);
}
/**
* Convert string from the font encoding.
*
* The method is used to convert strings retrieved from existing content streams
*
* @param string $string
* @param string $charEncoding Character encoding of resulting text.
* @return string
*/
public function decodeString($string, $charEncoding)
{
return iconv('CP1252', $charEncoding, $string);
}
}
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