Support CSS filter style

[claell]

Doesn't seem to be supported as of now. I didn't find an issue about this or any other related documentation for this and WeasyPrint.

Since I'd find the feature helpful, I am opening this issue.

[liZe]

That would be nice to have! Some filters are already handled by the PDF specification and should be quite "easy" to support, once the whole CSS parsing/validation code is done.

If someone wants to try, I can definitely help!

Related to #1962.

[grewn0uille]

Hello!

As you may know, two weeks ago was CourtBouillon 3-year anniversary 🎉.

For this occasion, we prepared a short survey to have your opinion on this year’s features and to know what you’d like to see in the future!
Don’t hesitate to give a boost to this feature ✨️

The survey is opened until November 19.

[claell]

Just came to this again, when trying to find a way to blur an area of an image. If there is a different way how to do this within WeasyPrint, I am all ears.

Also see https://stackoverflow.com/questions/78534282/applying-css-filter-property-to-pdf-generated-with-weasyprint

[liZe]

Just came to this again, when trying to find a way to blur an area of an image.

Unfortunately, as far as I know, there’s no blur operation in the PDF format. Other filters may be easy to add because they exist in PDF.

[claell]

Alright, thanks for letting me know! I plan to use a workaround for now (blurring the area of the image using Pillow beforehand). Probably less flexible, as it needs more planning and considerations, but also not too bad for now.