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

NAME
SDL_GetSystemTheme - Get the current system theme.
HEADER FILE
Defined in SDL3/SDL_video.h
SYNOPSIS
#include "SDL3/SDL.h" SDL_SystemTheme SDL_GetSystemTheme(void);
RETURN VALUE
( SDL_SystemTheme ) Returns the current system theme, light, dark, or unknown.
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_GetSystemTheme(3)