A test pattern generator based on https://raw.githubusercontent.com/PNDeb/pinenote-debian-image/dev/overlays/root/rotating_cgradient_by_puck.html
But rewritten using libSDL2 to allow for more control of the rendering
sudo apt install libsdl2-dev gcc
Clone the repository
cd into it.
Just build it (outputs to build/ that it creates):
./buildpp.pl pinenote_test_patternBuild and test it by running it:
./buildpp.pl pinenote_test_pattern --test ""Usage: pinenote_test_pattern [option] -h Show this help -a Disable HW accelerated rendering -d=X Draw X squares per update call, valid values 1,256 -p=X Insert a pause of X ms after each update call -t Show timing statistics In the 'application' press the upper left corner to exit, press anywhere else to draw the 'next' test pattern