Hello! My goal is to create some set of tools to setup projection using multiple projectors and edge blending. It is quite easy when it comes to write a standalone application (using opengl etc) that is able to "know" the amount of overlapping pixels and draw some transparent gradients on suitable edges etc, but I want to have this feature system-wide, I mean - I want to be able to run regular desktop environment using few projectors with software edge blending. So, for example, I have two 1920x1200 projectors, lying next to each other with, for example 100px overlap. In that case, I need to setup xrandr like this:
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm HDMI-1-2 connected 1920x1080+1820+0 (normal left inverted right x axis y axis) 521mm x 293mm so the HDMI-1-2 is shifted -100px to the left and xorg is displaying same 100px from right part of left output on left part of right output. Thats great and amazing, and in some cases it would be enough but not every projector has the edge blending feature, so my idea is to do that using software - just "simply" draw 100px gradient on right side of left output and similar but horizontally flipped on left side of right output. And thats the question - is it possible to draw only on practicular OUTPUT so even if part of the image is duplicated on another output due to randr settigs, that overlay will be displayed only on selected monitor? regards
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