`alpha_mask_bgr24b`
		Construct

`alpha_mask_u8`
		Construct
		attach
		mask_function
		pixel
		combine_pixel
		fill_hspan
		combine_hspan
		fill_vspan
		combine_vspan

`alpha_mask`
		attach
		mask_function
		pixel
		combine_pixel
		fill_hspan
		combine_hspan
		fill_vspan
		combine_vspan

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