ID2D1Transform.MapInputRectsToOutputRect

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.
interface ID2D1Transform
extern (Windows)
HRESULT
MapInputRectsToOutputRect
(
const(D2D1_RECT_L)* inputRects
,
const(D2D1_RECT_L)* inputOpaqueSubRects
,,
D2D1_RECT_L* outputRect
,
D2D1_RECT_L* outputOpaqueSubRect
)

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