90 lines
3.1 KiB
PHP
90 lines
3.1 KiB
PHP
<?php
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/**
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* E068_font_subset.php
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*
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* @since 2026-05-04
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* @category Library
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* @package Pdf
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* @author Nicola Asuni <info@tecnick.com>
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* @copyright 2002-2026 Nicola Asuni - Tecnick.com LTD
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* @license https://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE)
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* @link https://github.com/tecnickcom/tc-lib-pdf
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*
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* This file is part of tc-lib-pdf software library.
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*/
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// NOTE: local file reads (images, fonts, attachments) are restricted to an allowlist of
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// trusted paths that covers this package tree, so run the examples in place. To read assets
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// from other locations, list them in the 'allowedPaths' entry of the fileOptions constructor
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// parameter (see E047_remote_resources_security.php).
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// NOTE: run make fonts in the project root to generate the dependencies and example fonts.
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// autoloader when using Composer
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require __DIR__ . '/../vendor/autoload.php';
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// define fonts directory
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\define('K_PATH_FONTS', \realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));
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// main TCPDF object with font subsetting enabled
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$pdf = new \Com\Tecnick\Pdf\Tcpdf(
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unit: \Com\Tecnick\Pdf\Page\Unit::Millimeter,
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isunicode: true,
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subsetfont: true,
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compress: true,
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mode: \Com\Tecnick\Pdf\PdfConformance::None,
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objEncrypt: null,
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);
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$pdf->setCreator('tc-lib-pdf');
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$pdf->setAuthor('Nicola Asuni');
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$pdf->setSubject('tc-lib-pdf example: 068');
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$pdf->setTitle('Font Subsetting Example');
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$pdf->setKeywords('TCPDF tc-lib-pdf example font subsetting');
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$pdf->setPDFFilename('068_font_subset.pdf');
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// Insert DejaVu Sans font for subsetting test
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$bfont = $pdf->font->insert($pdf->pon, 'dejavusans', '', 12);
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// Add first page
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$page = $pdf->addPage();
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// Add font to the page
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$pdf->page->addContent($bfont['out']);
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// HTML content demonstrating varied character sets for subsetting
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$html = <<<'EOD'
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<h1>Font Subsetting Example</h1>
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<p>This document demonstrates <b>font subsetting</b> with DejaVu Sans font.</p>
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<p>Font subsetting reduces the file size by including only the characters
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that are actually used in the document, rather than embedding the entire font.</p>
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<h2>Character Sets</h2>
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<p><b>English:</b> THE QUICK BROWN FOX JUMPS OVER THE LAZY DOG - the quick brown fox jumps over the lazy dog.</p>
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<p><b>Numbers:</b> 0123456789 · π ≈ 3.14159</p>
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<p><b>Punctuation:</b> !@#$%^&*()[]{}–—«»‹›„“”‚‘’"'</p>
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<p><b>Symbols:</b> © ® ™ € £ ¥ ¢ § ¶ • ‰</p>
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<h2>Benefits of Font Subsetting</h2>
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<ul>
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<li>Reduced PDF file size</li>
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<li>Faster document transmission</li>
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<li>Only embedded characters are included</li>
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<li>Maintains font fidelity for used characters</li>
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</ul>
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<h2>Text Samples</h2>
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<p>Regular text in DejaVu Sans font for testing character coverage.</p>
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<p><b>Bold text</b> is also included in the subset.</p>
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EOD;
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// render the HTML content
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$pdf->addHTMLCell(html: $html, posx: 15, posy: 15, width: 180);
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// Get the PDF content
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$rawpdf = $pdf->getOutPDFString();
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// Render the PDF content
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$pdf->renderPDF(rawpdf: $rawpdf);
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