How would you "watch a pixel on the screen" in pure software. You need a camera ... | Hacker News

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tuna74 on Jan 26, 2025 | parent | context | favorite | on: Hard numbers in the Wayland vs. X11 input latency ...

How would you "watch a pixel on the screen" in pure software. You need a camera and an input device in the loop.

jay_kyburz on Jan 26, 2025 [–]

Is it not possible to simply query the frame buffer right before its sent down the HDMI cable. What color is pixel 0,0?

tuna74 on Jan 26, 2025 | [–]

Maybe you could do that by hacking the driver in a Linux system? I don't know actually.

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