Converts main level of the D3D texture to TImageData strucrue.

function CreateImageFromD3DTexture(const Texture: IDirect3DTexture9; 
                                   var Image: TImageData; 
                                   OverrideFormat: TImageFormat = ifUnknown): Boolean;

ImagingDirect3D9 (at line 134)

OverrideFormat can be used to convert output image to the specified format rather than use the format taken from D3D texture, ifUnknown means no conversion.