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Added SDL_SetWindowOpacity() and SDL_GetWindowOpacity().

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This is currently implemented for X11, Cocoa, Windows, and DirectFB.

This patch is based on work in Unreal Engine 4's fork of SDL,
compliments of Epic Games.
This commit is contained in:
Ryan C. Gordon 2016-01-05 02:46:10 -05:00
parent 5696e88e6b
commit 3bdaf4c611
19 changed files with 174 additions and 0 deletions
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28
include/SDL_video.h
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@ -845,6 +845,34 @@ extern DECLSPEC int SDLCALL SDL_SetWindowBrightness(SDL_Window * window, float b
*/
extern DECLSPEC float SDLCALL SDL_GetWindowBrightness(SDL_Window * window);
/**
* \brief Set the opacity for a window
*
* \param window The window which will be made transparent or opaque
* \param opacity Opacity (0.0f - transparent, 1.0f - opaque) This will be
* clamped internally between 0.0f and 1.0f.
*
* \return 0 on success, or -1 if setting the opacity isn't supported.
*
* \sa SDL_GetWindowOpacity()
*/
extern DECLSPEC int SDLCALL SDL_SetWindowOpacity(SDL_Window * window, float opacity);
/**
* \brief Get the opacity of a window.
*
* If transparency isn't supported on this platform, opacity will be reported
* as 1.0f without error.
*
* \param window The window in question.
* \param opacity Opacity (0.0f - transparent, 1.0f - opaque)
*
* \return 0 on success, or -1 on error (invalid window, etc).
*
* \sa SDL_SetWindowOpacity()
*/
extern DECLSPEC int SDLCALL SDL_GetWindowOpacity(SDL_Window * window, float * out_opacity);
/**
* \brief Set the gamma ramp for a window.
*