IDCompositionAffineTransform2DEffect.SetTransformMatrixElement

Undocumented in source but is binding to Windows. You might be able to learn more by searching the web for its name.

HRESULT SetTransformMatrixElement(int row, int column, float value)
HRESULT SetTransformMatrixElement(int row, int column, IDCompositionAnimation animation)
interface IDCompositionAffineTransform2DEffect
extern (Windows)
HRESULT
SetTransformMatrixElement
(
int row
,
int column
,
IDCompositionAnimation animation
)

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directx dcomp IDCompositionAffineTransform2DEffect functions