SDL_GetDisplayForRect - Man Page

#include <SDL3/SDL_video.h>

SDL_DisplayID SDL_GetDisplayForRect(const SDL_Rect *rect);

rect

the rect to query.

Returns the instance ID of the display entirely containing the rect or closest to the center of the rect on success or 0 on failure; call SDL_GetError() for more information.

This function should only be called on the main thread.

This function is available since SDL 3.2.0.

SDL_GetDisplayBounds(3), SDL_GetDisplays(3)