CidFont.php

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<?php
#require_once 'Zend/Pdf/Element/Array.php';
#require_once 'Zend/Pdf/Element/Dictionary.php';
#require_once 'Zend/Pdf/Element/Name.php';
#require_once 'Zend/Pdf/Element/Numeric.php';
#require_once 'Zend/Pdf/Element/String.php';


#require_once 'Zend/Pdf/Resource/Font.php';

abstract class Zend_Pdf_Resource_Font_CidFont extends Zend_Pdf_Resource_Font
{
    protected $_cmap = null;

    protected $_charWidths = null;

    protected $_missingCharWidth = 0;


    public function __construct(Zend_Pdf_FileParser_Font_OpenType $fontParser)
    {
        parent::__construct();

        $fontParser->parse();


        /* Object properties */

        $this->_fontNames = $fontParser->names;

        $this->_isBold       = $fontParser->isBold;
        $this->_isItalic     = $fontParser->isItalic;
        $this->_isMonospaced = $fontParser->isMonospaced;

        $this->_underlinePosition  = $fontParser->underlinePosition;
        $this->_underlineThickness = $fontParser->underlineThickness;
        $this->_strikePosition     = $fontParser->strikePosition;
        $this->_strikeThickness    = $fontParser->strikeThickness;

        $this->_unitsPerEm = $fontParser->unitsPerEm;

        $this->_ascent  = $fontParser->ascent;
        $this->_descent = $fontParser->descent;
        $this->_lineGap = $fontParser->lineGap;


        $this->_cmap = $fontParser->cmap;


        /* Resource dictionary */

        $baseFont = $this->getFontName(Zend_Pdf_Font::NAME_POSTSCRIPT, 'en', 'UTF-8');
        $this->_resource->BaseFont = new Zend_Pdf_Element_Name($baseFont);


        /* Constract characters widths array using font CMap and glyphs widths array */
        $glyphWidths = $fontParser->glyphWidths;
        $charGlyphs  = $this->_cmap->getCoveredCharactersGlyphs();
        $charWidths  = array();
        foreach ($charGlyphs as $charCode => $glyph) {
            if(isset($glyphWidths[$glyph]) && !is_null($glyphWidths[$glyph])) {
                $charWidths[$charCode] = $glyphWidths[$glyph];
            }
        }
        $this->_charWidths       = $charWidths;
        $this->_missingCharWidth = $glyphWidths[0];

        /* Width array optimization. Step1: extract default value */
        $widthFrequencies = array_count_values($charWidths);
        $defaultWidth          = null;
        $defaultWidthFrequency = -1;
        foreach ($widthFrequencies as $width => $frequency) {
            if ($frequency > $defaultWidthFrequency) {
                $defaultWidth          = $width;
                $defaultWidthFrequency = $frequency;
            }
        }

        // Store default value in the font dictionary
        $this->_resource->DW = new Zend_Pdf_Element_Numeric($this->toEmSpace($defaultWidth));

        // Remove characters which corresponds to default width from the widths array
        $defWidthChars = array_keys($charWidths, $defaultWidth);
        foreach ($defWidthChars as $charCode) {
            unset($charWidths[$charCode]);
        }

        // Order cheracter widths aray by character codes
        ksort($charWidths, SORT_NUMERIC);

        /* Width array optimization. Step2: Compact character codes sequences */
        $lastCharCode = -1;
        $widthsSequences = array();
        foreach ($charWidths as $charCode => $width) {
            if ($lastCharCode == -1) {
                $charCodesSequense = array();
                $sequenceStartCode = $charCode;
            } else if ($charCode != $lastCharCode + 1) {
                // New chracters sequence detected
                $widthsSequences[$sequenceStartCode] = $charCodesSequense;
                $charCodesSequense = array();
                $sequenceStartCode = $charCode;
            }
            $charCodesSequense[] = $width;
            $lastCharCode = $charCode;
        }
        // Save last sequence, if widths array is not empty (it may happens for monospaced fonts)
        if (count($charWidths) != 0) {
            $widthsSequences[$sequenceStartCode] = $charCodesSequense;
        }

        $pdfCharsWidths = array();
        foreach ($widthsSequences as $startCode => $widthsSequence) {
            /* Width array optimization. Step3: Compact widths sequences */
            $pdfWidths        = array();
            $lastWidth        = -1;
            $widthsInSequence = 0;
            foreach ($widthsSequence as $width) {
                if ($lastWidth != $width) {
                    // New width is detected
                    if ($widthsInSequence != 0) {
                        // Previous width value was a part of the widths sequence. Save it as 'c_1st c_last w'.
                        $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode);                         // First character code
                        $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode + $widthsInSequence - 1); // Last character code
                        $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($lastWidth));       // Width

                        // Reset widths sequence
                        $startCode = $startCode + $widthsInSequence;
                        $widthsInSequence = 0;
                    }

                    // Collect new width
                    $pdfWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($width));

                    $lastWidth = $width;
                } else {
                    // Width is equal to previous
                    if (count($pdfWidths) != 0) {
                        // We already have some widths collected
                        // So, we've just detected new widths sequence

                        // Remove last element from widths list, since it's a part of widths sequence
                        array_pop($pdfWidths);

                        // and write the rest if it's not empty
                        if (count($pdfWidths) != 0) {
                            // Save it as 'c_1st [w1 w2 ... wn]'.
                            $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
                            $pdfCharsWidths[] = new Zend_Pdf_Element_Array($pdfWidths);   // Widths array

                            // Reset widths collection
                            $startCode += count($pdfWidths);
                            $pdfWidths = array();
                        }

                        $widthsInSequence = 2;
                    } else {
                        // Continue widths sequence
                        $widthsInSequence++;
                    }
                }
            }

            // Check if we have widths collection or widths sequence to wite it down
            if (count($pdfWidths) != 0) {
                // We have some widths collected
                // Save it as 'c_1st [w1 w2 ... wn]'.
                $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode); // First character code
                $pdfCharsWidths[] = new Zend_Pdf_Element_Array($pdfWidths);   // Widths array
            } else if ($widthsInSequence != 0){
                // We have widths sequence
                // Save it as 'c_1st c_last w'.
                $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode);                         // First character code
                $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($startCode + $widthsInSequence - 1); // Last character code
                $pdfCharsWidths[] = new Zend_Pdf_Element_Numeric($this->toEmSpace($lastWidth));       // Width
            }
        }

        /* Create the Zend_Pdf_Element_Array object and add it to the font's
         * object factory and resource dictionary.
         */
        $widthsArrayElement = new Zend_Pdf_Element_Array($pdfCharsWidths);
        $widthsObject = $this->_objectFactory->newObject($widthsArrayElement);
        $this->_resource->W = $widthsObject;


        /* CIDSystemInfo dictionary */
        $cidSystemInfo = new Zend_Pdf_Element_Dictionary();
        $cidSystemInfo->Registry   = new Zend_Pdf_Element_String('Adobe');
        $cidSystemInfo->Ordering   = new Zend_Pdf_Element_String('UCS');
        $cidSystemInfo->Supplement = new Zend_Pdf_Element_Numeric(0);
        $cidSystemInfoObject            = $this->_objectFactory->newObject($cidSystemInfo);
        $this->_resource->CIDSystemInfo = $cidSystemInfoObject;
    }



    public function glyphNumbersForCharacters($characterCodes)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }

    public function glyphNumberForCharacter($characterCode)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }


    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') {
            $string = iconv($charEncoding, 'UTF-16BE', $string);
        }

        $charCount = iconv_strlen($string, 'UTF-16BE');
        if ($charCount == 0) {
            return 0;
        }

        /* Calculate the score by doing a lookup for each character.
         */
        $score = 0;
        $maxIndex = strlen($string);
        for ($i = 0; $i < $maxIndex; $i++) {
            $charCode = (ord($string[$i]) << 8) | ord($string[++$i]);
            /* This could probably be optimized a bit with a binary search...
             */
            if (isset($this->_charWidths[$charCode])) {
                $score++;
            }
        }
        return $score / $charCount;
    }

    public function widthsForChars($charCodes)
    {
        $widths = array();
        foreach ($charCodes as $key => $charCode) {
            if (!isset($this->_charWidths[$charCode])) {
                $widths[$key] = $this->_missingCharWidth;
            } else {
                $widths[$key] = $this->_charWidths[$charCode];
            }
        }
        return $widths;
    }

    public function widthForChar($charCode)
    {
        if (!isset($this->_charWidths[$charCode])) {
            return $this->_missingCharWidth;
        }
        return $this->_charWidths[$charCode];
    }

    public function widthsForGlyphs($glyphNumbers)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }

    public function widthForGlyph($glyphNumber)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }

    public function encodeString($string, $charEncoding)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }

    public function decodeString($string, $charEncoding)
    {
        #require_once 'Zend/Pdf/Exception.php';
        throw new Zend_Pdf_Exception('CIDFont PDF objects could not be used as the operand of the text drawing operators');
    }
}