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/framework/vendor/zend/Zend/Pdf/Resource/Font/Simple.php

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PHP | 283 lines | 74 code | 24 blank | 185 comment | 14 complexity | 5cd4c221ac1cbbe3d688859666b751e2 MD5 | raw file
  1<?php
  2/**
  3 * Zend Framework
  4 *
  5 * LICENSE
  6 *
  7 * This source file is subject to the new BSD license that is bundled
  8 * with this package in the file LICENSE.txt.
  9 * It is also available through the world-wide-web at this URL:
 10 * http://framework.zend.com/license/new-bsd
 11 * If you did not receive a copy of the license and are unable to
 12 * obtain it through the world-wide-web, please send an email
 13 * to license@zend.com so we can send you a copy immediately.
 14 *
 15 * @category   Zend
 16 * @package    Zend_Pdf
 17 * @subpackage Fonts
 18 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 19 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 20 * @version    $Id: Simple.php 20096 2010-01-06 02:05:09Z bkarwin $
 21 */
 22
 23
 24/** Internally used classes */
 25require_once 'Zend/Pdf/Element/Name.php';
 26
 27
 28/** Zend_Pdf_Resource_Font */
 29require_once 'Zend/Pdf/Resource/Font.php';
 30
 31/**
 32 * Adobe PDF Simple fonts implementation
 33 *
 34 * PDF simple fonts functionality is presented by Adobe Type 1
 35 * (including standard PDF Type1 built-in fonts) and TrueType fonts support.
 36 *
 37 * Both fonts have the following properties:
 38 * - Glyphs in the font are selected by single-byte character codes obtained from a
 39 *   string that is shown by the text-showing operators. Logically, these codes index
 40 *   into a table of 256 glyphs; the mapping from codes to glyphs is called the fontâ&#x20AC;&#x2122;s
 41 *   encoding.
 42 *   PDF specification provides a possibility to specify any user defined encoding in addition
 43 *   to the standard built-in encodings: Standard-Encoding, MacRomanEncoding, WinAnsiEncoding,
 44 *   and PDFDocEncoding, but Zend_Pdf simple fonts implementation operates only with
 45 *   Windows ANSI encoding (except Symbol and ZapfDingbats built-in fonts).
 46 *
 47 * - Each glyph has a single set of metrics, including a horizontal displacement or
 48 *   width. That is, simple fonts support only horizontal writing mode.
 49 *
 50 *
 51 * The code in this class is common to both types. However, you will only deal
 52 * directly with subclasses.
 53 *
 54 * Font objects should be normally be obtained from the factory methods
 55 * {@link Zend_Pdf_Font::fontWithName} and {@link Zend_Pdf_Font::fontWithPath}.
 56 *
 57 * @package    Zend_Pdf
 58 * @subpackage Fonts
 59 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
 60 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 61 */
 62abstract class Zend_Pdf_Resource_Font_Simple extends Zend_Pdf_Resource_Font
 63{
 64    /**
 65     * Object representing the font's cmap (character to glyph map).
 66     * @var Zend_Pdf_Cmap
 67     */
 68    protected $_cmap = null;
 69
 70    /**
 71     * Array containing the widths of each of the glyphs contained in the font.
 72     *
 73     * Keys are integers starting from 0, which coresponds to Zend_Pdf_Cmap::MISSING_CHARACTER_GLYPH.
 74     *
 75     * Font character map may contain gaps for actually used glyphs, nevertheless glyphWidths array
 76     * contains widths for all glyphs even they are unused.
 77     *
 78     * @var array
 79     */
 80    protected $_glyphWidths = null;
 81
 82    /**
 83     * Width for glyphs missed in the font
 84     *
 85     * Note: Adobe PDF specfication (V1.4 - V1.6) doesn't define behavior for rendering
 86     * characters missed in the standard PDF fonts (such us 0x7F (DEL) Windows ANSI code)
 87     * Adobe Font Metrics files doesn't also define metrics for "missed glyph".
 88     * We provide character width as "0" for this case, but actually it depends on PDF viewer
 89     * implementation.
 90     *
 91     * @var integer
 92     */
 93    protected $_missingGlyphWidth = 0;
 94
 95
 96    /**** Public Interface ****/
 97
 98
 99  /* Object Lifecycle */
100
101    /**
102     * Object constructor
103     *
104     */
105    public function __construct()
106    {
107        parent::__construct();
108
109        /**
110         * @todo
111         * It's easy to add other encodings support now (Standard-Encoding, MacRomanEncoding,
112         * PDFDocEncoding, MacExpertEncoding, Symbol, and ZapfDingbats).
113         * Steps for the implementation:
114         * - completely describe all PDF single byte encodings in the documentation
115         * - implement non-WinAnsi encodings processing into encodeString()/decodeString() methods
116         *
117         * These encodings will be automatically supported for standard builtin PDF fonts as well
118         * as for external fonts.
119         */
120        $this->_resource->Encoding = new Zend_Pdf_Element_Name('WinAnsiEncoding');
121    }
122
123    /**
124     * Returns an array of glyph numbers corresponding to the Unicode characters.
125     *
126     * If a particular character doesn't exist in this font, the special 'missing
127     * character glyph' will be substituted.
128     *
129     * See also {@link glyphNumberForCharacter()}.
130     *
131     * @param array $characterCodes Array of Unicode character codes (code points).
132     * @return array Array of glyph numbers.
133     */
134    public function glyphNumbersForCharacters($characterCodes)
135    {
136        return $this->_cmap->glyphNumbersForCharacters($characterCodes);
137    }
138
139    /**
140     * Returns the glyph number corresponding to the Unicode character.
141     *
142     * If a particular character doesn't exist in this font, the special 'missing
143     * character glyph' will be substituted.
144     *
145     * See also {@link glyphNumbersForCharacters()} which is optimized for bulk
146     * operations.
147     *
148     * @param integer $characterCode Unicode character code (code point).
149     * @return integer Glyph number.
150     */
151    public function glyphNumberForCharacter($characterCode)
152    {
153        return $this->_cmap->glyphNumberForCharacter($characterCode);
154    }
155
156    /**
157     * Returns a number between 0 and 1 inclusive that indicates the percentage
158     * of characters in the string which are covered by glyphs in this font.
159     *
160     * Since no one font will contain glyphs for the entire Unicode character
161     * range, this method can be used to help locate a suitable font when the
162     * actual contents of the string are not known.
163     *
164     * Note that some fonts lie about the characters they support. Additionally,
165     * fonts don't usually contain glyphs for control characters such as tabs
166     * and line breaks, so it is rare that you will get back a full 1.0 score.
167     * The resulting value should be considered informational only.
168     *
169     * @param string $string
170     * @param string $charEncoding (optional) Character encoding of source text.
171     *   If omitted, uses 'current locale'.
172     * @return float
173     */
174    public function getCoveredPercentage($string, $charEncoding = '')
175    {
176        /* Convert the string to UTF-16BE encoding so we can match the string's
177         * character codes to those found in the cmap.
178         */
179        if ($charEncoding != 'UTF-16BE') {
180            if (PHP_OS != 'AIX') { // AIX doesnt know what UTF-16BE is
181                $string = iconv($charEncoding, 'UTF-16BE', $string);
182            }
183        }
184
185        $charCount = (PHP_OS != 'AIX') ? iconv_strlen($string, 'UTF-16BE') : strlen($string);
186        if ($charCount == 0) {
187            return 0;
188        }
189
190        /* Fetch the covered character code list from the font's cmap.
191         */
192        $coveredCharacters = $this->_cmap->getCoveredCharacters();
193
194        /* Calculate the score by doing a lookup for each character.
195         */
196        $score = 0;
197        $maxIndex = strlen($string);
198        for ($i = 0; $i < $maxIndex; $i++) {
199            /**
200             * @todo Properly handle characters encoded as surrogate pairs.
201             */
202            $charCode = (ord($string[$i]) << 8) | ord($string[++$i]);
203            /* This could probably be optimized a bit with a binary search...
204             */
205            if (in_array($charCode, $coveredCharacters)) {
206                $score++;
207            }
208        }
209        return $score / $charCount;
210    }
211
212    /**
213     * Returns the widths of the glyphs.
214     *
215     * The widths are expressed in the font's glyph space. You are responsible
216     * for converting to user space as necessary. See {@link unitsPerEm()}.
217     *
218     * See also {@link widthForGlyph()}.
219     *
220     * @param array &$glyphNumbers Array of glyph numbers.
221     * @return array Array of glyph widths (integers).
222     */
223    public function widthsForGlyphs($glyphNumbers)
224    {
225        $widths = array();
226        foreach ($glyphNumbers as $key => $glyphNumber) {
227            if (!isset($this->_glyphWidths[$glyphNumber])) {
228                $widths[$key] = $this->_missingGlyphWidth;
229            } else {
230                $widths[$key] = $this->_glyphWidths[$glyphNumber];
231            }
232        }
233        return $widths;
234    }
235
236    /**
237     * Returns the width of the glyph.
238     *
239     * Like {@link widthsForGlyphs()} but used for one glyph at a time.
240     *
241     * @param integer $glyphNumber
242     * @return integer
243     */
244    public function widthForGlyph($glyphNumber)
245    {
246        if (!isset($this->_glyphWidths[$glyphNumber])) {
247            return $this->_missingGlyphWidth;
248        }
249        return $this->_glyphWidths[$glyphNumber];
250    }
251
252    /**
253     * Convert string to the font encoding.
254     *
255     * The method is used to prepare string for text drawing operators
256     *
257     * @param string $string
258     * @param string $charEncoding Character encoding of source text.
259     * @return string
260     */
261    public function encodeString($string, $charEncoding)
262    {
263        if (PHP_OS == 'AIX') {
264            return $string; // returning here b/c AIX doesnt know what CP1252 is
265        }
266
267        return iconv($charEncoding, 'CP1252//IGNORE', $string);
268    }
269
270    /**
271     * Convert string from the font encoding.
272     *
273     * The method is used to convert strings retrieved from existing content streams
274     *
275     * @param string $string
276     * @param string $charEncoding Character encoding of resulting text.
277     * @return string
278     */
279    public function decodeString($string, $charEncoding)
280    {
281        return iconv('CP1252', $charEncoding, $string);
282    }
283}