BGRA Scan-Out Support
This section applies only to Windows 7 and later operating systems.
The scan-out bit is turned on for the DXGI_FORMAT_B8G8R8A8_UNORM and DXGI_FORMAT_B8G8R8A8_UNORM_SRGB formats. Therefore, the user-mode display driver should be able to perform the following operations:
Handle requests for the primary surface that are in these formats.
Handle calls to its SetDisplayMode function for resources that are created with these formats.
Handle calls to its PresentDXGI function to present these formats through both bit-block transfer (bitblt) and flip operations.
Handle calls to its BltDXGI function to copy these formats through stretch, rotate, and resolve (in fact, all the bitblt operations that are expected for the RGBA variants).