generated from jric11/baseProject
196 lines
9.2 KiB
PHP
196 lines
9.2 KiB
PHP
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<?php
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/**
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* E052_custom_fonts_fallback.php
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*
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* Demonstrates custom font selection, Unicode coverage strategy, and
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* font-family fallback across multiple scripts.
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*
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* What this demonstrates:
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* - font->insert(): loading built-in and extended font families.
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* - Subset vs full-embed tradeoff (constructor $subsetfont flag).
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* - Choosing fonts by Unicode coverage: helvetica (Latin), dejavusans
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* (Latin + Greek + Cyrillic + IPA), unifont (full Unicode BMP).
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* - HTML font-family CSS mapping to pre-loaded font slots.
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* - Per-script font selection in addHTMLCell markup.
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*
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* Companion libraries: tc-lib-pdf-font, tc-lib-unicode, tc-lib-unicode-data.
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*
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* @since 2026-05-01
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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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require __DIR__ . '/../vendor/autoload.php';
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// K_PATH_FONTS must point to the directory holding .z and .php font metric files.
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define('K_PATH_FONTS', (string) realpath(__DIR__ . '/../vendor/tecnickcom/tc-lib-pdf-font/target/fonts'));
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// Subset font embedding: when $subsetfont = true (constructor arg 3), only the
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// glyphs actually used in the document are embedded. This produces smaller PDFs
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// but makes the font unsuitable for later editing. Set to false for archival PDFs
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// (PDF/A, PDF/UA) or whenever the full character set must be available.
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$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: false,
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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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$pdf->setSubject('tc-lib-pdf example: 052');
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$pdf->setTitle('Custom Fonts & Unicode Fallback');
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$pdf->setKeywords('TCPDF tc-lib-pdf font unicode multilingual fallback subset dejavusans unifont');
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$pdf->setPDFFilename('052_custom_fonts_fallback.pdf');
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$pdf->setViewerPreferences(['DisplayDocTitle' => true]);
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$pdf->enableDefaultPageContent();
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// ----------
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// Pre-load all font families that will be used in the document.
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// font->insert() returns a font descriptor array. The 'out' key contains
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// the PDF operator stream that must be injected onto a page before the
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// font is used. Loading fonts before addPage() registers them in the
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// font object pool; injecting 'out' at the start of each page activates
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// the font for that page.
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// Helvetica: core Type-1, no embedding required, Latin + standard symbols only.
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$fHelvetica = $pdf->font->insert($pdf->pon, 'helvetica', '', 11);
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$fHelveticaB = $pdf->font->insert($pdf->pon, 'helvetica', 'B', 11);
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// Times New Roman (core): serif alternative for body text, Latin only.
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$fTimes = $pdf->font->insert($pdf->pon, 'times', '', 11);
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// Courier (core): monospaced, Latin only; good for code samples.
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$fCourier = $pdf->font->insert($pdf->pon, 'courier', '', 10);
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// DejaVu Sans: TrueType, Latin + Greek + Cyrillic + IPA + many other scripts.
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// Covers most Western European, Eastern European, and Slavic languages.
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$fDejavu = $pdf->font->insert($pdf->pon, 'dejavusans', '', 11);
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// Unifont: TrueType, very broad Unicode BMP (plane 0) coverage including Arabic,
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// Hebrew, Thai, Devanagari, and many additional scripts.
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// File size is large; use subset=true when embedding it in production PDFs.
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$fUnifont = $pdf->font->insert($pdf->pon, 'unifont', '', 11);
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// ===| Page 1 – Font Coverage Overview |=====================================
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$pdf->addPage(['format' => 'A4']);
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$pdf->page->addContent($fHelvetica['out']);
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$overviewHtml = '<h1 style="font-family: helvetica;">Font Selection & Unicode Fallback</h1>
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<p style="font-family: helvetica; font-size: 10pt;">
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PDF viewers cannot substitute fonts automatically — every glyph must come from
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an embedded font resource. The strategy is:
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</p>
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<ol style="font-family: helvetica; font-size: 10pt;">
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<li>Use <strong>core Type-1 fonts</strong> (helvetica, times, courier) for Latin-only text to
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avoid embedding overhead.</li>
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<li>Upgrade to <strong>DejaVu Sans</strong> for pages that mix Latin with Greek, Cyrillic, or
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extended Latin (diacritics, IPA).</li>
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<li>Use <strong>Unifont</strong> for pages that require full Unicode BMP coverage (Arabic, Hebrew,
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Thai, Devanagari, Hangul, CJK).</li>
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</ol>
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<p style="font-family: helvetica; font-size: 10pt;">
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In HTML cells, specify the font via <code>style="font-family: dejavusans"</code> or
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<code>style="font-family: unifont"</code>.
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The name must match the lowercase font identifier known to tc-lib-pdf-font.
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</p>
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<hr/>
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<h2 style="font-family: helvetica;">Core Type-1 Fonts (Latin)</h2>
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<p style="font-family: helvetica; font-size: 11pt;">
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<span style="font-family: helvetica;">Helvetica — The quick brown fox jumps over the lazy dog.</span>
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</p>
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<p style="font-family: times; font-size: 11pt;">
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<span style="font-family: times;">Times — The quick brown fox jumps over the lazy dog.</span>
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</p>
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<p style="font-family: courier; font-size: 10pt;">
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<span style="font-family: courier;">Courier — The quick brown fox jumps over the lazy dog.</span>
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</p>';
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$pdf->addHTMLCell(html: $overviewHtml, posx: 15, posy: 20, width: 175);
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// ===| Page 2 – DejaVu Sans: Latin + Greek + Cyrillic |======================
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$pdf->addPage(['format' => 'A4']);
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$pdf->page->addContent($fDejavu['out']);
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$dejavuHtml = '<h2 style="font-family: dejavusans;">DejaVu Sans — Extended Coverage</h2>
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<p style="font-family: dejavusans; font-size: 10pt;">
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DejaVu Sans covers Latin, Greek, Cyrillic, Armenian, Georgian, Hebrew,
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Arabic (basic), and many more. Use it when helvetica glyphs are missing.
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</p>
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<h3 style="font-family: dejavusans;">Latin Extended</h3>
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<p style="font-family: dejavusans; font-size: 11pt;">
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Héllo Wörld — café, naïve, résumé, Ångström, façade, Ñoño.
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</p>
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<h3 style="font-family: dejavusans;">Greek (Ελληνικά)</h3>
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<p style="font-family: dejavusans; font-size: 11pt;">
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Ξεσκεπάζω την ψυχοφθόρα βδελυγμία.
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</p>
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<h3 style="font-family: dejavusans;">Cyrillic (Русский)</h3>
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<p style="font-family: dejavusans; font-size: 11pt;">
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Съешь же ещё этих мягких французских булок, да выпей чаю.
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</p>
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<h3 style="font-family: dejavusans;">IPA Phonetics</h3>
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<p style="font-family: dejavusans; font-size: 11pt;">
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/ˌɪntəˈnæʃənl/ · /fəˈnɛtɪk/ · /ˈælfəbɪt/
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</p>
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<hr/>
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<p style="font-family: dejavusans; font-size: 9pt; color: #555555;">
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Subset tip: dejavusans is ~750 KB uncompressed. With <code>$subsetfont = true</code> and
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only the glyphs used in this page, the embedded subset would be much smaller.
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For documents mixing many scripts across many pages, subset embedding is recommended.
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</p>';
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$pdf->addHTMLCell(html: $dejavuHtml, posx: 15, posy: 20, width: 175);
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// ===| Page 3 – Unifont: Full BMP |==========================================
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$pdf->addPage(['format' => 'A4']);
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$pdf->page->addContent($fUnifont['out']);
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$unifontHtml = '<h2 style="font-family: unifont; font-size: 11pt; font-weight: normal;">Unifont — Full Unicode BMP Coverage</h2>
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<p style="font-family: unifont; font-size: 11pt;">
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Unifont offers very broad Unicode Plane 0 (BMP) coverage.
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Use it as a last-resort fallback for scripts not covered by DejaVu.
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Production PDFs should always use <code>$subsetfont = true</code> with Unifont.
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</p>
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<h3 style="font-family: unifont; font-size: 11pt; font-weight: normal;">Arabic (العربية) — RTL</h3>
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<p style="font-family: unifont; font-size: 11pt; text-align: right;">
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صِف خَلقَ خَودِكِ كَمِثلِ الشَّمسِ إِذ بَزَغَت
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</p>
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<h3 style="font-family: unifont; font-size: 11pt; font-weight: normal;">Hebrew (עברית) — RTL</h3>
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<p style="font-family: unifont; font-size: 11pt; text-align: right;">
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דג סקרן שט בים מאוכזב ולפתע מצא חברה
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</p>
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<h3 style="font-family: unifont; font-size: 11pt; font-weight: normal;">Devanagari (हिन्दी)</h3>
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<p style="font-family: unifont; font-size: 11pt;">
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ऋषि सुयश ने प्रख्यात ग्रंथ की रचना करके हमें ज्ञान दिया।
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</p>
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<hr/>
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<p style="font-family: unifont; font-size: 11pt; color: #555555;">
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Fallback strategy: attempt to render with the most specific font first.
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Only escalate to Unifont for code points absent from narrower families.
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This minimises file size while ensuring every glyph is available.
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</p>';
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$pdf->addHTMLCell(html: $unifontHtml, posx: 15, posy: 20, width: 175);
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// ----------
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$rawpdf = $pdf->getOutPDFString();
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$pdf->renderPDF(rawpdf: $rawpdf);
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