491 lines
19 KiB
PHP
491 lines
19 KiB
PHP
<?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: CidFont.php 18993 2009-11-15 17:09:16Z alexander $
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*/
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/** Internally used classes */
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require_once 'Zend/Pdf/Element/Array.php';
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require_once 'Zend/Pdf/Element/Dictionary.php';
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require_once 'Zend/Pdf/Element/Name.php';
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require_once 'Zend/Pdf/Element/Numeric.php';
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require_once 'Zend/Pdf/Element/String.php';
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/** Zend_Pdf_Resource_Font */
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require_once 'Zend/Pdf/Resource/Font.php';
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/**
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* Adobe PDF CIDFont font object implementation
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*
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* A CIDFont program contains glyph descriptions that are accessed using a CID as
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* the character selector. There are two types of CIDFont. A Type 0 CIDFont contains
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* glyph descriptions based on Adobe’s Type 1 font format, whereas those in a
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* Type 2 CIDFont are based on the TrueType font format.
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*
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* A CIDFont dictionary is a PDF object that contains information about a CIDFont program.
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* Although its Type value is Font, a CIDFont is not actually a font. It does not have an Encoding
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* entry, it cannot be listed in the Font subdictionary of a resource dictionary, and it cannot be
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* used as the operand of the Tf operator. It is used only as a descendant of a Type 0 font.
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* The CMap in the Type 0 font is what defines the encoding that maps character codes to CIDs
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* in the CIDFont.
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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_CidFont 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 character that have entries in used character map.
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*
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* @var array
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*/
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protected $_charWidths = null;
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/**
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* Width for characters missed in the font
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*
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* @var integer
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*/
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protected $_missingCharWidth = 0;
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/**
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* Object constructor
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*
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* @param Zend_Pdf_FileParser_Font_OpenType $fontParser Font parser object
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* containing OpenType file.
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* @param integer $embeddingOptions Options for font embedding.
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* @throws Zend_Pdf_Exception
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*/
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public function __construct(Zend_Pdf_FileParser_Font_OpenType $fontParser)
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{
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parent::__construct();
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$fontParser->parse();
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/* Object properties */
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$this->_fontNames = $fontParser->names;
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$this->_isBold = $fontParser->isBold;
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$this->_isItalic = $fontParser->isItalic;
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$this->_isMonospaced = $fontParser->isMonospaced;
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$this->_underlinePosition = $fontParser->underlinePosition;
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$this->_underlineThickness = $fontParser->underlineThickness;
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$this->_strikePosition = $fontParser->strikePosition;
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$this->_strikeThickness = $fontParser->strikeThickness;
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$this->_unitsPerEm = $fontParser->unitsPerEm;
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$this->_ascent = $fontParser->ascent;
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$this->_descent = $fontParser->descent;
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$this->_lineGap = $fontParser->lineGap;
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$this->_cmap = $fontParser->cmap;
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/* Resource dictionary */
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$baseFont = $this->getFontName(Zend_Pdf_Font::NAME_POSTSCRIPT, 'en', 'UTF-8');
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$this->_resource->BaseFont = new Zend_Pdf_Element_Name($baseFont);
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/**
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* Prepare widths array.
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*/
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/* Constract characters widths array using font CMap and glyphs widths array */
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$glyphWidths = $fontParser->glyphWidths;
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$charGlyphs = $this->_cmap->getCoveredCharactersGlyphs();
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$charWidths = array();
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foreach ($charGlyphs as $charCode => $glyph) {
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$charWidths[$charCode] = $glyphWidths[$glyph];
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}
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$this->_charWidths = $charWidths;
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$this->_missingCharWidth = $glyphWidths[0];
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/* Width array optimization. Step1: extract default value */
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$widthFrequencies = array_count_values($charWidths);
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$defaultWidth = null;
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$defaultWidthFrequency = -1;
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foreach ($widthFrequencies as $width => $frequency) {
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if ($frequency > $defaultWidthFrequency) {
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$defaultWidth = $width;
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$defaultWidthFrequency = $frequency;
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}
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}
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// Store default value in the font dictionary
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$this->_resource->DW = new Zend_Pdf_Element_Numeric($this->toEmSpace($defaultWidth));
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// Remove characters which corresponds to default width from the widths array
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$defWidthChars = array_keys($charWidths, $defaultWidth);
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foreach ($defWidthChars as $charCode) {
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unset($charWidths[$charCode]);
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}
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// Order cheracter widths aray by character codes
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ksort($charWidths, SORT_NUMERIC);
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/* Width array optimization. Step2: Compact character codes sequences */
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$lastCharCode = -1;
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$widthsSequences = array();
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foreach ($charWidths as $charCode => $width) {
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if ($lastCharCode == -1) {
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$charCodesSequense = array();
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$sequenceStartCode = $charCode;
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} else if ($charCode != $lastCharCode + 1) {
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// New chracters sequence detected
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$widthsSequences[$sequenceStartCode] = $charCodesSequense;
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$charCodesSequense = array();
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$sequenceStartCode = $charCode;
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}
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$charCodesSequense[] = $width;
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$lastCharCode = $charCode;
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}
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// Save last sequence, if widths array is not empty (it may happens for monospaced fonts)
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if (count($charWidths) != 0) {
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$widthsSequences[$sequenceStartCode] = $charCodesSequense;
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}
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$pdfCharsWidths = array();
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foreach ($widthsSequences as $startCode => $widthsSequence) {
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/* Width array optimization. Step3: Compact widths sequences */
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$pdfWidths = array();
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$lastWidth = -1;
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$widthsInSequence = 0;
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foreach ($widthsSequence as $width) {
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if ($lastWidth != $width) {
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// New width is detected
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if ($widthsInSequence != 0) {
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// Previous width value was a part of the widths sequence. Save it as 'c_1st c_last w'.
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode + $widthsInSequence - 1); // Last character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($lastWidth)); // Width
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// Reset widths sequence
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$startCode = $startCode + $widthsInSequence;
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$widthsInSequence = 0;
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}
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// Collect new width
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$pdfWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($width));
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$lastWidth = $width;
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} else {
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// Width is equal to previous
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if (count($pdfWidths) != 0) {
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// We already have some widths collected
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// So, we've just detected new widths sequence
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// Remove last element from widths list, since it's a part of widths sequence
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array_pop($pdfWidths);
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// and write the rest if it's not empty
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if (count($pdfWidths) != 0) {
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// Save it as 'c_1st [w1 w2 ... wn]'.
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Array($pdfWidths); // Widths array
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// Reset widths collection
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$startCode += count($pdfWidths);
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$pdfWidths = array();
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}
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$widthsInSequence = 2;
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} else {
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// Continue widths sequence
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$widthsInSequence++;
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}
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}
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}
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// Check if we have widths collection or widths sequence to wite it down
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if (count($pdfWidths) != 0) {
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// We have some widths collected
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// Save it as 'c_1st [w1 w2 ... wn]'.
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Array($pdfWidths); // Widths array
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} else if ($widthsInSequence != 0){
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// We have widths sequence
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// Save it as 'c_1st c_last w'.
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode + $widthsInSequence - 1); // Last character code
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$pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($lastWidth)); // Width
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}
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}
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/* Create the Zend_Pdf_Element_Array object and add it to the font's
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* object factory and resource dictionary.
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*/
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$widthsArrayElement = new Zend_Pdf_Element_Array($pdfCharsWidths);
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$widthsObject = $this->_objectFactory->newObject($widthsArrayElement);
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$this->_resource->W = $widthsObject;
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/* CIDSystemInfo dictionary */
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$cidSystemInfo = new Zend_Pdf_Element_Dictionary();
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$cidSystemInfo->Registry = new Zend_Pdf_Element_String('Adobe');
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$cidSystemInfo->Ordering = new Zend_Pdf_Element_String('UCS');
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$cidSystemInfo->Supplement = new Zend_Pdf_Element_Numeric(0);
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$cidSystemInfoObject = $this->_objectFactory->newObject($cidSystemInfo);
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$this->_resource->CIDSystemInfo = $cidSystemInfoObject;
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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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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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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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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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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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$string = iconv($charEncoding, 'UTF-16BE', $string);
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}
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$charCount = iconv_strlen($string, 'UTF-16BE');
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if ($charCount == 0) {
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return 0;
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}
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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 (isset($this->_charWidths[$charCode])) {
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$score++;
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}
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}
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return $score / $charCount;
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}
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/**
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* Returns the widths of the Chars.
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*
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* The widths are expressed in the font's glyph space. You are responsible
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* for converting to user space as necessary. See {@link unitsPerEm()}.
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*
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* See also {@link widthForChar()}.
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*
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* @param array &$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 widthsForChars($charCodes)
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{
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$widths = array();
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foreach ($charCodes as $key => $charCode) {
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if (!isset($this->_charWidths[$charCode])) {
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$widths[$key] = $this->_missingCharWidth;
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} else {
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$widths[$key] = $this->_charWidths[$charCode];
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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 character.
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*
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* Like {@link widthsForChars()} but used for one char at a time.
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*
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* @param integer $charCode
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* @return integer
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*/
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public function widthForChar($charCode)
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{
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if (!isset($this->_charWidths[$charCode])) {
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return $this->_missingCharWidth;
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}
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return $this->_charWidths[$charCode];
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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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* @param array &$glyphNumbers Array of glyph numbers.
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* @return array Array of glyph widths (integers).
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* @throws Zend_Pdf_Exception
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*/
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public function widthsForGlyphs($glyphNumbers)
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{
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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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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 $glyphNumber
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* @return integer
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* @throws Zend_Pdf_Exception
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*/
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public function widthForGlyph($glyphNumber)
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{
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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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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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* @param string $string
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* @param string $charEncoding Character encoding of source text.
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* @return string
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* @throws Zend_Pdf_Exception
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* */
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public function encodeString($string, $charEncoding)
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{
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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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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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* @param string $string
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* @param string $charEncoding Character encoding of resulting text.
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* @return string
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* @throws Zend_Pdf_Exception
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*/
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public function decodeString($string, $charEncoding)
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{
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/**
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* CIDFont object is not actually a font. It does not have an Encoding entry,
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* it cannot be listed in the Font subdictionary of a resource dictionary, and
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* it cannot be used as the operand of the Tf operator.
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*
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* Throw an exception.
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*/
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require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
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}
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}
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