I want to write a gfxdriver, In my hardware, there are three layer, vid(fb1)--osd(fb0) and an  attribute layer(fb2), fb2 is used to control alpha blending between osd(fb0) and vid layer(fb1), I quite confused about how to write the gfxdriver, can anybody give me some advice? 
 
Thank in advance 
 
 
Thanks
 
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