Convert SVG to PDF when convert_to_pdf() is not sufficient

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As stated in the documentation the img.convert_to_pdf() function does not fully support SVG to PDF conversion. For example, I've encountered an issue with the <style> tag in SVG files, see this issue. As this limitation is mentioned in the docs, it's not a bug, but you probably still want to have your SVG files rendered correctly.

Therefore, if you face such a limitation, you could draw on other libraries. For me, cairosvg worked great. Install it via pip

pip install cairosvg

Then use cairo to convert your SVG file to PDF bytes and finally open these bytes with fitz. It's as simple as:

def convert_svg_to_pdf(path) -> bytes:
    with open(path, 'r') as f:
        return cairosvg.svg2pdf(bytestring=f.read())

img_path = 'your/path/to/the/image.svg'
pdfbytes = convert_svg_to_pdf(img_path)

# Open image in fitz to read image dimensions (use rect later)
img = fitz.open(img_path)
rect = img[0].rect  # pic dimension
img.close()

# Process pdf with fitz
pdf = fitz.open('pdf', pdfbytes)  # open stream as PDF

# Do something with pdf, e.g.
page = doc.new_page(width=rect.width, height=rect.height)
page.show_pdf_page(rect, pdf, 0)
doc.save('your/out/path.pdf')
...