Watermark support

[abhayarawal]

Is your feature request related to a problem? Please describe.
The background image feature lets you add a quasi-watermark, but all content in the PDF is rendered on top of it. It's fine when your PDF only has text; however, when you have PDFs with images, the watermark gets cut off because the images are rendered on top of the background.

Describe the solution you'd like
A way to add overlays or watermark would be great.

[johnfercher]

I don´t get it. Could you provide an example? Did you saw this example?

[abhayarawal]

Sure, here's an example

here, the watermark is a background image. Since all the pdf contents are rendered on top of the background, the watermark gets cut off by the image. I want the watermark to appear on top of the document so it covers everything.

[johnfercher]

Oh I see, thank you. Maybe we can use this jung-kurt/gofpdf#240