ID2D1CommandSink.FillOpacityMask

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface ID2D1CommandSink
extern (Windows)
HRESULT
FillOpacityMask
(
ID2D1Bitmap opacityMask
,
ID2D1Brush brush
,
const(D2D1_RECT_F)* destinationRectangle
,
const(D2D1_RECT_F)* sourceRectangle
)

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