IDCompositionDevice::CreateMatrixTransform method (dcomp.h)

Creates a 2D 3-by-2 matrix transform object.

Syntax

HRESULT CreateMatrixTransform(
  [out] IDCompositionMatrixTransform **matrixTransform
);

Parameters

[out] matrixTransform

Type: IDCompositionMatrixTransform**

The new matrix transform object. This parameter must not be NULL.

Return value

Type: HRESULT

If the function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code. See DirectComposition Error Codes for a list of error codes.

Remarks

A new matrix transform object has the identity matrix as its initial value. The identity matrix is the 3x2 matrix with ones on the main diagonal and zeros elsewhere, as shown in the following illustration.

When an identity transform is applied to an object, it does not change the position, shape, or size of the object. It is similar to the way that multiplying a number by one does not change the number. Any transform other than the identity transform will modify the position, shape, and/or size of objects.

Requirements

See also

IDCompositionDevice

IDCompositionVisual::SetTransform