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ray
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V 27
2014-04-04T11:19:02.891982Z
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V 300
MFC r263885

o Add new vd_driver method to do bitblt with mask, named vd_maskbitbltchr.
o Move vd_bitbltchr vga's driver method to vd_maskbitbltchr.
o Implement new vd_bitbltchr method for vga driver. (It do single write for 8
	pixels, have to be a bit faster).

Sponsored by:	The FreeBSD Foundation

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