Zend_Pdf module provides a possibility to extract fonts from
loaded documents.
It may be useful for incremental document updates. Without this functionality you have to attach and possibly embed font into a document each time you want to update it.
Zend_Pdf and Zend_Pdf_Page objects provide
special methods to extract all fonts mentioned within a document or a page:
Example 656. Extracting fonts from a loaded document
<?php
...
$pdf = Zend_Pdf::load($documentPath);
...
// Get all document fonts
$fontList = $pdf->extractFonts();
$pdf->pages[] = ($page = $pdf->newPage(Zend_Pdf_Page::SIZE_A4));
$yPosition = 700;
foreach ($fontList as $font) {
$page->setFont($font, 15);
$fontName = $font->getFontName(Zend_Pdf_Font::NAME_POSTSCRIPT,
'en',
'UTF-8');
$page->drawText($fontName . ': The quick brown fox jumps over the lazy dog',
100,
$yPosition,
'UTF-8');
$yPosition -= 30;
}
...
// Get fonts referenced within the first document page
$firstPage = reset($pdf->pages);
$firstPageFonts = $firstPage->extractFonts();
...
Example 657. Extracting font from a loaded document by specifying font name
<?php
...
$pdf = new Zend_Pdf();
...
$pdf->pages[] = ($page = $pdf->newPage(Zend_Pdf_Page::SIZE_A4));
$font = Zend_Pdf_Font::fontWithPath($fontPath);
$page->setFont($font, $fontSize);
$page->drawText($text, $x, $y);
...
// This font name should be stored somewhere...
$fontName = $font->getFontName(Zend_Pdf_Font::NAME_POSTSCRIPT,
'en',
'UTF-8');
...
$pdf->save($docPath);
...
<?php
...
$pdf = Zend_Pdf::load($docPath);
...
$pdf->pages[] = ($page = $pdf->newPage(Zend_Pdf_Page::SIZE_A4));
/* $srcPage->extractFont($fontName) can also be used here */
$font = $pdf->extractFont($fontName);
$page->setFont($font, $fontSize);
$page->drawText($text, $x, $y);
...
$pdf->save($docPath, true /* incremental update mode */);
...
Extracted fonts can be used in the place of any other font with the following limitations:
Extracted font can be used only in the context of the document from which it was extracted.
-
Possibly embedded font program is actually not extracted. So extracted font can't provide correct font metrics and original font has to be used for text width calculations:
<?php
...
$font = $pdf->extractFont($fontName);
$originalFont = Zend_Pdf_Font::fontWithPath($fontPath);
$page->setFont($font /* use extracted font for drawing */, $fontSize);
$xPosition = $x;
for ($charIndex = 0; $charIndex < strlen($text); $charIndex++) {
$page->drawText($text[$charIndex], xPosition, $y);
// Use original font for text width calculation
$width = $originalFont->widthForGlyph(
$originalFont->glyphNumberForCharacter($text[$charIndex])
);
$xPosition += $width/$originalFont->getUnitsPerEm()*$fontSize;
}
...