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The class is virtual and has one subclass, SubsampledYUVFrame, which is used by the VP9 decoder to return a single frame. The output_to_bitmap(Bitmap&) function can be used to set pixels on an existing bitmap of the correct size to the RGB values that should be displayed. The to_bitmap() function will allocate a new bitmap and fill it using output_to_bitmap. This new class also implements bilinear scaling of the subsampled U and V planes so that subsampled videos' colors will appear smoother.