###### (This is the legacy documentation for SDL2, the previous stable version; [SDL3](https://wiki.libsdl.org/SDL3/) is the current stable version.)
# SDL_GetWindowOpacity

Get the opacity of a window.

## Header File

Defined in [SDL_video.h](https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_video.h)

## Syntax

```c
int SDL_GetWindowOpacity(SDL_Window * window, float * out_opacity);
```

## Function Parameters

|                            |                 |                                                          |
| -------------------------- | --------------- | -------------------------------------------------------- |
| [SDL_Window](SDL_Window) * | **window**      | the window to get the current opacity value from.        |
| float *                    | **out_opacity** | the float filled in (0.0f - transparent, 1.0f - opaque). |

## Return Value

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

## Remarks

If transparency isn't supported on this platform, opacity will be reported
as 1.0f without error.

The parameter `opacity` is ignored if it is NULL.

This function also returns -1 if an invalid window was provided.

## Version

This function is available since SDL 2.0.5.

## See Also

- [SDL_SetWindowOpacity](SDL_SetWindowOpacity)

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