Function sdl2_sys::SDL_GetWindowOpacity

source · 
pub unsafe extern "C" fn SDL_GetWindowOpacity(
    window: *mut SDL_Window,
    out_opacity: *mut f32,
) -> c_int
Expand description

Get the opacity of a window.

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.

\param window the window to get the current opacity value from \param out_opacity the float filled in (0.0f - transparent, 1.0f - opaque) \returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.

\since This function is available since SDL 2.0.5.

\sa SDL_SetWindowOpacity