Simple Font-Loader
As different text styles are achieved by using different font families there needs to be a logic that loads and returns the needed font instances.
In this demo we implement a simple font loader that ignores the font-family and only cares about the requested font-style.
PHP
<?php
// load and register the autoload function
require_once __DIR__ . '/../../../../../../bootstrap.php';
// create a writer
$writer = new \SetaPDF_Core_Writer_Http('font-loader.pdf', true);
// get a document instance
$document = \SetaPDF_Core_Document::loadByFilename(
$assetsDirectory . '/pdfs/lenstown/Laboratory-Report.pdf',
$writer
);
$loadedFonts = [];
/* This is a simple font-loader that is ignoring the font-family but simply switches between font-styles.
* It is an urgent requirement to cache the instances for a document instance. Otherwise, you will create
* and embed several minimal font subsets.
*/
$fontLoader = static function(\SetaPDF_Core_Document $document, $fontFamily, $fontStyle) use (&$loadedFonts, $assetsDirectory) {
$cacheKey = $document->getInstanceIdent() . '_' . $fontStyle;
if (!array_key_exists($cacheKey, $loadedFonts)) {
$fontPath = $assetsDirectory . '/fonts/DejaVu/ttf/DejaVuSans';
switch ($fontStyle) {
case 'B':
$font = new \SetaPDF_Core_Font_Type0_Subset($document, $fontPath . '-Bold.ttf');
break;
case 'I':
$font = new \SetaPDF_Core_Font_Type0_Subset($document, $fontPath . '-Oblique.ttf');
break;
case 'BI':
$font = new \SetaPDF_Core_Font_Type0_Subset($document, $fontPath . '-BoldOblique.ttf');
break;
default:
$font = new \SetaPDF_Core_Font_Type0_Subset($document, $fontPath . '.ttf');
}
$loadedFonts[$cacheKey] = $font;
}
return $loadedFonts[$cacheKey];
};
// now simply create a stam instance
$stamp = new \SetaPDF_Stamper_Stamp_RichText($document, $fontLoader);
// pass an HTML like text to format the output
$stamp->setText(<<<HTML
This <b>stamp</b> uses <span style="font-family: Anything;"><i>DejaVuSans</i></span> <b><i>throughout</i></b>!
HTML
);
// create a stamper instance
$stamper = new \SetaPDF_Stamper($document);
// pass the stamp instance
$stamper->addStamp($stamp);
// stamp the document
$stamper->stamp();
// save and send it to the client
$document->save()->finish();