draw offscreen so we can see the alpha-channel we are writing todo: know when to use a gpu-surface
draw offscreen so we can see the alpha-channel we are writing
todo: know when to use a gpu-surface



git-svn-id: e8541e15acce502a64c929015570ad1648e548cd@6436 2bbb7eff-a529-9590-31e7-b0007b416f81

Cue/skia,Cue/skia,Cue/skia,Cue/skia