284 lines
9.7 KiB
PHP
284 lines
9.7 KiB
PHP
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<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Simple.php 16541 2009-07-07 06:59:03Z bkarwin $
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*/
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/** Zend_Pdf_Resource_Font */
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require_once 'Zend/Pdf/Resource/Font.php';
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/** Zend_Pdf_Cmap */
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require_once 'Zend/Pdf/Cmap.php';
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/**
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* Adobe PDF Simple fonts implementation
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*
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* PDF simple fonts functionality is presented by Adobe Type 1
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* (including standard PDF Type1 built-in fonts) and TrueType fonts support.
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*
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* Both fonts have the following properties:
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* - Glyphs in the font are selected by single-byte character codes obtained from a
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* string that is shown by the text-showing operators. Logically, these codes index
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* into a table of 256 glyphs; the mapping from codes to glyphs is called the font’s
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* encoding.
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* PDF specification provides a possibility to specify any user defined encoding in addition
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* to the standard built-in encodings: Standard-Encoding, MacRomanEncoding, WinAnsiEncoding,
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* and PDFDocEncoding, but Zend_Pdf simple fonts implementation operates only with
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* Windows ANSI encoding (except Symbol and ZapfDingbats built-in fonts).
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*
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* - Each glyph has a single set of metrics, including a horizontal displacement or
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* width. That is, simple fonts support only horizontal writing mode.
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*
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*
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* The code in this class is common to both types. However, you will only deal
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* directly with subclasses.
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*
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* Font objects should be normally be obtained from the factory methods
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* {@link Zend_Pdf_Font::fontWithName} and {@link Zend_Pdf_Font::fontWithPath}.
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*
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* @package Zend_Pdf
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* @subpackage Fonts
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* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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abstract class Zend_Pdf_Resource_Font_Simple extends Zend_Pdf_Resource_Font
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{
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/**
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* Object representing the font's cmap (character to glyph map).
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* @var Zend_Pdf_Cmap
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*/
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protected $_cmap = null;
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/**
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* Array containing the widths of each of the glyphs contained in the font.
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*
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* Keys are integers starting from 0, which coresponds to Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH.
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*
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* Font character map may contain gaps for actually used glyphs, nevertheless glyphWidths array
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* contains widths for all glyphs even they are unused.
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*
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* @var array
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*/
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protected $_glyphWidths = null;
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/**
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* Width for glyphs missed in the font
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*
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* Note: Adobe PDF specfication (V1.4 - V1.6) doesn't define behavior for rendering
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* characters missed in the standard PDF fonts (such us 0x7F (DEL) Windows ANSI code)
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* Adobe Font Metrics files doesn't also define metrics for "missed glyph".
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* We provide character width as "0" for this case, but actually it depends on PDF viewer
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* implementation.
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*
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* @var integer
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*/
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protected $_missingGlyphWidth = 0;
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/**** Public Interface ****/
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/* Object Lifecycle */
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/**
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* Object constructor
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*
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*/
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public function __construct()
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{
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parent::__construct();
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/**
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* @todo
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* It's easy to add other encodings support now (Standard-Encoding, MacRomanEncoding,
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* PDFDocEncoding, MacExpertEncoding, Symbol, and ZapfDingbats).
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* Steps for the implementation:
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* - completely describe all PDF single byte encodings in the documentation
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* - implement non-WinAnsi encodings processing into encodeString()/decodeString() methods
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*
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* These encodings will be automatically supported for standard builtin PDF fonts as well
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* as for external fonts.
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*/
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$this->_resource->Encoding = new Zend_Pdf_Element_Name('WinAnsiEncoding');
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}
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/**
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* Returns an array of glyph numbers corresponding to the Unicode characters.
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*
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* If a particular character doesn't exist in this font, the special 'missing
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* character glyph' will be substituted.
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*
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* See also {@link glyphNumberForCharacter()}.
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*
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* @param array $characterCodes Array of Unicode character codes (code points).
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* @return array Array of glyph numbers.
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*/
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public function glyphNumbersForCharacters($characterCodes)
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{
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return $this->_cmap->glyphNumbersForCharacters($characterCodes);
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}
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/**
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* Returns the glyph number corresponding to the Unicode character.
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*
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* If a particular character doesn't exist in this font, the special 'missing
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* character glyph' will be substituted.
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*
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* See also {@link glyphNumbersForCharacters()} which is optimized for bulk
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* operations.
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*
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* @param integer $characterCode Unicode character code (code point).
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* @return integer Glyph number.
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*/
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public function glyphNumberForCharacter($characterCode)
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{
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return $this->_cmap->glyphNumberForCharacter($characterCode);
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}
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/**
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* Returns a number between 0 and 1 inclusive that indicates the percentage
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* of characters in the string which are covered by glyphs in this font.
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*
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* Since no one font will contain glyphs for the entire Unicode character
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* range, this method can be used to help locate a suitable font when the
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* actual contents of the string are not known.
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*
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* Note that some fonts lie about the characters they support. Additionally,
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* fonts don't usually contain glyphs for control characters such as tabs
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* and line breaks, so it is rare that you will get back a full 1.0 score.
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* The resulting value should be considered informational only.
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*
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* @param string $string
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* @param string $charEncoding (optional) Character encoding of source text.
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* If omitted, uses 'current locale'.
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* @return float
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*/
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public function getCoveredPercentage($string, $charEncoding = '')
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{
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/* Convert the string to UTF-16BE encoding so we can match the string's
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* character codes to those found in the cmap.
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*/
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if ($charEncoding != 'UTF-16BE') {
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if (PHP_OS != 'AIX') { // AIX doesnt know what UTF-16BE is
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$string = iconv($charEncoding, 'UTF-16BE', $string);
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}
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}
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$charCount = (PHP_OS != 'AIX') ? iconv_strlen($string, 'UTF-16BE') : strlen($string);
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if ($charCount == 0) {
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return 0;
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}
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/* Fetch the covered character code list from the font's cmap.
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*/
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$coveredCharacters = $this->_cmap->getCoveredCharacters();
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/* Calculate the score by doing a lookup for each character.
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*/
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$score = 0;
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$maxIndex = strlen($string);
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for ($i = 0; $i < $maxIndex; $i++) {
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/**
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* @todo Properly handle characters encoded as surrogate pairs.
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*/
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$charCode = (ord($string[$i]) << 8) | ord($string[++$i]);
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/* This could probably be optimized a bit with a binary search...
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*/
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if (in_array($charCode, $coveredCharacters)) {
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$score++;
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}
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}
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return $score / $charCount;
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}
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/**
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* Returns the widths of the glyphs.
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*
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* The widths are expressed in the font's glyph space. You are responsible
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* for converting to user space as necessary. See {@link unitsPerEm()}.
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*
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* See also {@link widthForGlyph()}.
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*
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* @param array &$glyphNumbers Array of glyph numbers.
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* @return array Array of glyph widths (integers).
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*/
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public function widthsForGlyphs($glyphNumbers)
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{
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$widths = array();
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foreach ($glyphNumbers as $key => $glyphNumber) {
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if (!isset($this->_glyphWidths[$glyphNumber])) {
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$widths[$key] = $this->_missingGlyphWidth;
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} else {
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$widths[$key] = $this->_glyphWidths[$glyphNumber];
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}
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}
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return $widths;
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}
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/**
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* Returns the width of the glyph.
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*
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* Like {@link widthsForGlyphs()} but used for one glyph at a time.
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*
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* @param integer $glyphNumber
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* @return integer
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*/
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public function widthForGlyph($glyphNumber)
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{
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if (!isset($this->_glyphWidths[$glyphNumber])) {
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return $this->_missingGlyphWidth;
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}
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return $this->_glyphWidths[$glyphNumber];
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}
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/**
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* Convert string to the font encoding.
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*
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* The method is used to prepare string for text drawing operators
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*
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* @param string $string
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* @param string $charEncoding Character encoding of source text.
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* @return string
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*/
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public function encodeString($string, $charEncoding)
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{
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if (PHP_OS == 'AIX') {
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return $string; // returning here b/c AIX doesnt know what CP1252 is
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}
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return iconv($charEncoding, 'CP1252//IGNORE', $string);
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}
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/**
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* Convert string from the font encoding.
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*
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* The method is used to convert strings retrieved from existing content streams
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*
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* @param string $string
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* @param string $charEncoding Character encoding of resulting text.
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* @return string
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*/
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public function decodeString($string, $charEncoding)
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{
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return iconv('CP1252', $charEncoding, $string);
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}
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}
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