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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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1
src/video/directfb/SDL_DirectFB_video.c
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@@ -121,6 +121,7 @@ DirectFB_CreateDevice(int devindex)
device->SetWindowIcon = DirectFB_SetWindowIcon;
device->SetWindowPosition = DirectFB_SetWindowPosition;
device->SetWindowSize = DirectFB_SetWindowSize;
device->SetWindowOpacity = DirectFB_SetWindowOpacity;
device->ShowWindow = DirectFB_ShowWindow;
device->HideWindow = DirectFB_HideWindow;
device->RaiseWindow = DirectFB_RaiseWindow;

13
src/video/directfb/SDL_DirectFB_window.c
View File

@@ -529,4 +529,17 @@ DirectFB_AdjustWindowSurface(SDL_Window * window)
return;
}
int
DirectFB_SetWindowOpacity(_THIS, SDL_Window * window, float opacity)
{
const Uint8 alpha = (Uint8) ((unsigned int) (opacity * 255.0f));
SDL_DFB_WINDOWDATA(window);
SDL_DFB_CHECKERR(windata->dfbwin->SetOpacity(windata->dfbwin, alpha));
windata->opacity = alpha;
return 0;
error:
return -1;
}
#endif /* SDL_VIDEO_DRIVER_DIRECTFB */

1
src/video/directfb/SDL_DirectFB_window.h
View File

@@ -75,6 +75,7 @@ extern SDL_bool DirectFB_GetWindowWMInfo(_THIS, SDL_Window * window,
struct SDL_SysWMinfo *info);
extern void DirectFB_AdjustWindowSurface(SDL_Window * window);
extern int DirectFB_SetWindowOpacity(_THIS, SDL_Window * window, float opacity);
#endif /* _SDL_directfb_window_h */