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XRandR supports applying transformations to an output's picture including changes to scale. Such scaling is used by some desktop environments under feature names such as "fractional scaling" to accomodate HiDPI devices. Alternatively, such scaling can be enabled by a command such as the following: xrandr --output DP1 --scale 0.5x0.5 --filter nearest XRandR scaling has no "HiDPI awareness" or other way for an application to signal that it wants to work with physical display pixels, and so all we do is scale SDL's returned display modes so that applications receive the number of usable pixels that they expect.
Simple DirectMedia Layer (SDL) Version 3.0
Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.
More extensive documentation is available in the docs directory, starting with README.md
Enjoy!
Sam Lantinga (slouken@libsdl.org)