Background and foreground colors

[samuelbradshaw]

Hi! In #2071 (comment) it was mentioned that PDF.js supports setting a foreground and background color. However, I'm not sure where or how to set it when rendering a PDF page directly to a canvas. I'm basing my code on the examples here: https://mozilla.github.io/pdf.js/examples/

Is it possible to set a foreground and background color when rendering the PDF page?

I'd like to set the canvas background color to transparent, so I can put the text layer behind it, to make text selection and highlight colors look more natural. Secondarily, I'd like to support dark mode (dark background and light text).