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DirectFB Reference Manual
IDirectFBWindow.html
IDirectFBWindow
SetOpaqueRegion
Disable alpha channel blending for one region of the window.
SetOpaqueRegion (
IDirectFBWindow.html
IDirectFBWindow
*
thiz,
int
x1,
int
y1,
int
x2,
int
y2
);
If DWOP_ALPHACHANNEL and DWOP_OPAQUE_REGION are set but not DWOP_COLORKEYING and the opacity of the window is 255 the window gets rendered without alpha blending within the specified region.
This is extremely useful for alpha blended window decorations while the main content stays opaque and gets rendered faster.
