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finally a example of XRandR

A mailing-list post named “XRandR transform (keystone correction) ….” is finally the rosetta stone to understand XRandR.

the important part (thanks to Glynn Clements for this):

First, the transformation converts from output coordinates to input
coordinates. So the above will result in the bottom corners of the
screen being mapped 100 pixels in from the edge (i.e. you’ll lose 100
pixels at each side). Except, it’s actually 200 pixels for the matrix
which you give.

Second, 0,0 is the top-left corner, not the bottom-left (this isn’t
stated in the manual page,

hope that helps if you are in a need for a transformed X11 window to output to HDMI/SDI whatever (as I had the need for).

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