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When the bDXVA_Func variable is equal to 2, the operation specified is the loading of data specifying an alpha-blending surface to be blended with video data. There are three ways that the alpha-blending data can be loaded:
A 16-entry AYUV palette with an index-alpha 4-4 (IA44) or alpha-index 4-4 (AI44) alpha-blending surface
A 16-entry AYUV palette with DPXD, Highlight, and DCCMD data
An AYUV graphic surface
The DXVA_ConfigAlphaLoad structure determines which of these methods is used.