SDL_MUSTLOCK - Man Page
Evaluates to true if the surface needs to be locked before access.
Synopsis
#include <SDL3/SDL_surface.h> #define SDL_MUSTLOCK(S) (((S)->flags & SDL_SURFACE_LOCK_NEEDED) == SDL_SURFACE_LOCK_NEEDED)
Availability
This macro is available since SDL 3.2.0.
Info
SDL 3.4.18 Simple Directmedia Layer SDL3 FUNCTIONS