SVG image type support

[echaconairlan]

Is there any workaround to add this support? I really need it for adding some highcharts graphs.

[simogeo]

any news regarding this feature request ? Thanks in advance

[MegaChriz]

I briefly looked at this today together with a collegae.

We found out that:

• SVG data should be written to Word in a different way than a PNG or a JPEG:
  • PNG and JPEG are written in \PhpOffice\PhpWord\Writer\Word2007\Element\Image and are using (among more) a XML tag called 'w:pict'.
  • SVG needs to start with a XML tag called 'w:drawing'. This makes them closer related to \PhpOffice\PhpWord\Writer\Word2007\Element\Chart than to \PhpOffice\PhpWord\Writer\Word2007\Element\Image.
• SVG data shouldn't be written to the Word XML as is. Instead, in the Word XML a reference (r:id) needs to be used.
• \PhpOffice\PhpWord\Element\Image::checkImage() uses PHP image functions that don't work for SVG images, like getimagesizefromstring(). image_type_to_mime_type(), used to determine the mime type of the image, has no listing for SVG, see https://www.php.net/image_type_to_mime_type.
• The mimetype for SVG should be 'image/svg+xml'.
• In Word's openXML documentation we saw that we would at least need to use a XML tag called 'asvg:svgBlip'. See https://learn.microsoft.com/en-us/dotnet/api/documentformat.openxml.linq.asvg.svgblip?view=openxml-3.0.1#documentformat-openxml-linq-asvg-svgblip
• We found a code example here for generating Word XML for SVG images: https://www.docx4java.org/forums/docx-java-f6/add-svg-to-document-t2927.html#p10155. It is in Java, but it does give an idea about which XML tags should be used to write the data.
• By calling the getData() method on a \PhpOffice\PhpWord\Shared\XMLWriter object you can get an idea about what Word XML gets produced. I temporarily added var_dump($xmlWriter->getData());die(); to \PhpOffice\PhpWord\Writer\Word2007\Element\Image::writeImage() to see what was getting outputted.

That's how far as we got today.

Todo:

• I think that in phpword/src/PhpWord/Writer/Word2007/Element we would need to add a new class called SvgImage. The code from \PhpOffice\PhpWord\Writer\Word2007\Element\Chart could probably be used as a starting point for this class.
• Likewise, I think that we need to have a SvgImage class in phpword/src/PhpWord/Element so a svg image can be added by calling $phpWord->addSvgImage().