fill pattern
The Cairo backend renders the attached correctly (tested with Evince).
The Qt5 backend misses the fill pattern (the grid of red Xs inside the red outlined circle) (tested with Okular).
The backend used by pdftoppm
with PPM output also misses the fill pattern.
I think it might be possible to add fill pattern support to the Qt5 backend by using QBrush::setTextureImage()
and related, but as I have neither experience with QPainter, nor Poppler code base, I'm not volunteering to do the work, sorry.