SDL_GetWindowDisplayScale - Man Page

#include <SDL3/SDL_video.h>

float SDL_GetWindowDisplayScale(SDL_Window *window);

This is a combination of the window pixel density and the display content scale, and is the expected scale for displaying content in this window. For example, if a 3840x2160 window had a display scale of 2.0, the user expects the content to take twice as many pixels and be the same physical size as if it were being displayed in a 1920x1080 window with a display scale of 1.0.

Conceptually this value corresponds to the scale display setting, and is updated when that setting is changed, or the window moves to a display with a different scale setting.

window

the window to query.

for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

SDL_GetDisplayContentScale(3), SDL_GetWindowPixelDensity(3).