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fbflut

framebuffer pixelflut server in C.

running

compile with make
make sure you have read/write access to the framebuffer (ie put yourself in the video group)
go in something that wont fight you for the framebuffer, ie a tty
do ./fbflut (or ./fbflut <port>)
connect with netcat or something, the default port is 1234

caveats

this writes directly to your framebuffer, which might not use (aa)rrggbb (bbggrraa is somewhat common). if you have alpha trailing at the end, uncomment lines 42 and 43 to allow omitting it in PX commands
fbflut does not store its own buffer, the canvas is entirely stored in the framebuffer, so be weary of other programs writing to it as thats the only copy