Provided by: libsdl3-doc_3.2.8+ds-1_all 

NAME
SDL_GetMouseFocus - Get the window which currently has mouse focus.
HEADER FILE
Defined in SDL3/SDL_mouse.h
SYNOPSIS
#include "SDL3/SDL.h" SDL_Window * SDL_GetMouseFocus(void);
RETURN VALUE
( SDL_Window *) Returns the window with mouse focus.
THREAD SAFETY
This function should only be called on the main thread.
AVAILABILITY
This function is available since SDL 3.2.0. Simple Directmedia Layer SDL 3.2.8 SDL_GetMouseFocus(3)