# SDL_UpdateWindowSurface

Copy the window surface to the screen.

## Header File

Defined in [<SDL3/SDL_video.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_video.h)

## Syntax

```c
bool SDL_UpdateWindowSurface(SDL_Window *window);
```

## Function Parameters

|                            |            |                       |
| -------------------------- | ---------- | --------------------- |
| [SDL_Window](SDL_Window) * | **window** | the window to update. |

## Return Value

(bool) Returns true on success or false on failure; call
[SDL_GetError](SDL_GetError)() for more information.

## Remarks

This is the function you use to reflect any changes to the surface on the
screen.

This function is equivalent to the SDL 1.2 API [SDL_Flip](SDL_Flip)().

## Thread Safety

This function should only be called on the main thread.

## Version

This function is available since SDL 3.2.0.

## See Also

- [SDL_GetWindowSurface](SDL_GetWindowSurface)
- [SDL_UpdateWindowSurfaceRects](SDL_UpdateWindowSurfaceRects)

----
[CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryVideo](CategoryVideo)