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


Get the opacity of a window.


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

Function Parameters

window the window to get the current opacity value from
out_opacity the float filled in (0.0f - transparent, 1.0f - opaque)

Return Value

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


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.


This function is available since SDL 2.0.5.


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