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D3DKMDT_VPPR_GET_CONTENT_ROTATION_PART function (d3dkmdt.h)

A helper function that extracts the rotation angle from a given value of the D3DKMDT_VIDPN_PRESENT_PATH_ROTATION enumeration. Only drivers that support path-independent rotation (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM1_3_PATH_INDEPENDENT_ROTATION) should call this function.

Syntax

D3DKMDT_VIDPN_PRESENT_PATH_ROTATION D3DKMDT_VPPR_GET_CONTENT_ROTATION_PART(
  D3DKMDT_VIDPN_PRESENT_PATH_ROTATION Rotation
);

Parameters

Rotation

On input, a value from the D3DKMDT_VIDPN_PRESENT_PATH_ROTATION enumeration.

On output, a value between 1 and 4, inclusive, that corresponds to the ROTATION portion of the D3DKMDT_VIDPN_PRESENT_PATH_ROTATION constant values. An output value of 1 (identity) represents 0 degrees of rotation, 2 represents 90 degrees, and so on. An output value of 0 indicates that the VidPN path is not initialized.

Return value

The returned value corresponds to the rotation angle as follows:

Input enumeration value Input enumeration constant Rotation in degrees Output Rotation value
0 D3DKMDT_VPPR_UNINITIALIZED - 0
1 D3DKMDT_VPPR_IDENTITY 0 1
2 D3DKMDT_VPPR_ROTATE90 90 2
3 D3DKMDT_VPPR_ROTATE180 180 3
4 D3DKMDT_VPPR_ROTATE270 270 4
5 D3DKMDT_VPPR_IDENTITY_OFFSET90 0 1
6 D3DKMDT_VPPR_ROTATE90_OFFSET90 90 2
7 D3DKMDT_VPPR_ROTATE180_OFFSET90 180 3
8 D3DKMDT_VPPR_ROTATE270_OFFSET90 270 4
9 D3DKMDT_VPPR_IDENTITY_OFFSET180 0 1
10 D3DKMDT_VPPR_ROTATE90_OFFSET180 90 2
11 D3DKMDT_VPPR_ROTATE180_OFFSET180 180 3
12 D3DKMDT_VPPR_ROTATE270_OFFSET180 270 4
13 D3DKMDT_VPPR_IDENTITY_OFFSET270 0 1
14 D3DKMDT_VPPR_ROTATE90_OFFSET270 90 2
15 D3DKMDT_VPPR_ROTATE180_OFFSET270 180 3
16 D3DKMDT_VPPR_ROTATE270_OFFSET270 270 4

Remarks

This function is declared inline in D3dkmdt.h as:

__inline
D3DKMDT_VIDPN_PRESENT_PATH_ROTATION 
    D3DKMDT_VPPR_GET_CONTENT_ROTATION_PART(
        D3DKMDT_VIDPN_PRESENT_PATH_ROTATION Rotation)
{
    if ((Rotation >= D3DKMDT_VPPR_IDENTITY_OFFSET90) &&
        (Rotation <= D3DKMDT_VPPR_ROTATE270_OFFSET270))
    {
        Rotation = 
            (D3DKMDT_VIDPN_PRESENT_PATH_ROTATION)(
                ((Rotation - 1) % 4) + 1);
    }
    return Rotation;
}

Your driver typically won't need to call this function.

Requirements

Requirement Value
Minimum supported client Windows 8.1,DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM1_3_PATH_INDEPENDENT_ROTATION
Minimum supported server Windows Server 2012 R2
Target Platform Desktop
Header d3dkmdt.h

See also

D3DKMDT_VIDPN_PRESENT_PATH_ROTATION