SDL Wiki
(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

SDL_LockSurface

Set up a surface for directly accessing the pixels.

Syntax

int SDL_LockSurface(SDL_Surface * surface);

Function Parameters

surface

the SDL_Surface structure to be locked

Return Value

Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

Remarks

Between calls to SDL_LockSurface() / SDL_UnlockSurface(), you can write to and read from surface->pixels, using the pixel format stored in surface->format. Once you are done accessing the surface, you should use SDL_UnlockSurface() to release it.

Not all surfaces require locking. If SDL_MUSTLOCK(surface) evaluates to 0, then you can read and write to the surface at any time, and the pixel format of the surface will not change.

Version

This function is available since SDL 2.0.0.

SDL_MUSTLOCK
SDL_UnlockSurface

CategoryAPI


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