Embedding SVGs into PDFs with embedded fonts - pdf

Question

I want to embed an SVG image into a PDF, and have the font families specified in the SVG text elements render using the correct fonts.
The fonts I am using are the 'Lato' TTF fonts.
Here is the code I have used to convert the fonts to TCPDF's "native format":
$variants = [
'Black',
'BlackItalic',
'Bold',
'BoldItalic',
'Hairline',
'HairlineItalic',
'Heavy',
'HeavyItalic',
'Italic',
'Light',
'LightItalic',
'Medium',
'MediumItalic',
'Regular',
'Semibold',
'SemiboldItalic',
'Thin',
'ThinItalic',
];
foreach ($variants as $variant) {
\TCPDF_FONTS::addTTFfont(
'/var/www/fonts/Lato-' . $variant . '.ttf',
'',
'',
32,
'/var/www/fonts/output/'
);
}
And here is the code I've used to generate a test PDF with an embedded SVG:
$svg_content = '<svg width="600px" height="800px">';
foreach ($variants as $key => $variant) {
$svg_content .= '<text x="30" y="' . ( 30 * ( $key + 1 ) ) . '" fill="#ED6E46" font-size="20" font-family="\'Lato-' . $variant . '\'" text-anchor="start">The quick brown fox jumped over the lazy dog (' . $variant . ').</text>';
}
$svg_content .= '</svg>';
$pdf = new TCPDF();
$pdf->SetPrintHeader(false);
$pdf->SetPrintFooter(false);
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
$pdf->SetMargins(0, 0, -1, true);
$pdf->SetAutoPageBreak(false, 0);
$pdf->AddPage();
$pdf->AddFont('Lato-Black', '', '/var/www/fonts/output/latoblack.php');
$pdf->ImageSVG('#' . $svg_content, 0, 0, 300, 300, '', $align='', $palign='C', $border=0, false);
$pdf->Output(
preg_replace('/[^A-Za-z0-9]/', '', $influencer->getName()) . '.pdf',
'I'
);
The result I get is that all the text is rendered in what I assume is Helvetica:
If I add a line just before the call to ImageSVG() like this:
$pdf->SetFont('Lato-Black', '', null, '/var/www/fonts/output/latoblack.php');
Then all the text is rendered in Lato-Black:
It seems to me that the fonts are being embedded in the PDF fine, but the SetFont obviously sets the current font for subsequent PDF text elements, and the text elements within the SVG image render using this font.
My desired behaviour is that the font-family attributes defined on the SVG text elements are honoured within the PDF, so that each line renders using the font variant mentioned in the brackets at the end of the line.
How can I do this?

Answer 1

You could start with the following code and work backwards incorporating your changes.
To be clear I'm not specifically advocating this as the way to do it, only that this is one way that works and so should help as a starting point.
Font Converter:
$variants = [
'Black',
'BlackItalic',
'Bold',
'BoldItalic',
'Hairline',
'HairlineItalic',
'Heavy',
'HeavyItalic',
'Italic',
'Light',
'LightItalic',
'Medium',
'MediumItalic',
'Regular',
'Semibold',
'SemiboldItalic',
'Thin',
'ThinItalic',
];
foreach ($variants as $variant) {
\TCPDF_FONTS::addTTFfont(dirname(__FILE__) . '/fonts/Lato-' . $variant . '.ttf', 'TrueTypeUnicode', '', 96);
}
echo 'Done!';
This puts the .php, .z and .ctg.z files within /tecnickcom/tcpdf/fonts.
PDF Generator:
Note the different font-family names in the $variants array:
$variants = [
'lato',
'latob',
'latobi',
'latoblack',
'latoblacki',
'latohairline',
'latohairlinei',
'latoheavy',
'latoheavyi',
'latoi',
'latolight',
'latolighti',
'latomedium',
'latomediumi',
'latosemib',
'latosemibi',
'latothin',
'latothini'
];
$svg_content = '<svg width="600px" height="800px">';
foreach ($variants as $key => $variant) {
$svg_content .= '<text x="30" y="' . ( 30 * ( $key + 1 ) ) . '" fill="#ED6E46" font-size="20" font-family="\'' . $variant . '\'" text-anchor="start">The quick brown fox jumped over the lazy dog (' . $variant . ').</text>';
}
$svg_content .= '</svg>';
ob_start();
$pdf = new TCPDF();
$pdf->SetPrintHeader(false);
$pdf->SetPrintFooter(false);
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
$pdf->SetMargins(0, 0, -1, true);
$pdf->SetAutoPageBreak(false, 0);
$pdf->AddPage();
//$pdf->AddFont('latoblack', '', dirname(__FILE__) . '/fonts/output/latoblack.php');
$pdf->ImageSVG('#' . $svg_content, 0, 0, 300, 300, '', $align='', $palign='C', $border=0, false);
$pdf->Output('example_001.pdf', 'I');
Output: