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[directfb-dev] Re: Flipping troubles - videolayer, crtc2
On Tue, 2002-06-18 at 16:58, Jiri Svoboda wrote: > Hi, > > > Thanks. I've tested it but I get only a green screen > > (symptom of backbuffer not being flipped at all). > > Will check it. > > > I think it's because when you test for the YV12 blit, and it is true, > > you set do_flipping=0. I think buggy YV12 blitting and > > buffer flipping are two separate issues, and should be tested > > separately. > > I set do_flipping on version basis - for 0.9.12 and above (same as > blit). And it is connected to YV12 blit. If I set backbuffer into system > memory flipping works only when bitblt is OK. So I enabled flipping for > version 0.9.12 and above. BTW: flipping on matrox BES is supoorted also > from 0.9.12.... > > Because of bitblt bug flipping is not safe on 0.9.11 even if it is > supported by dfb. Flipping from backvideo should not be affected by the blit bug, only flipping from the backsystem. I guess you can use a test similar to the following: create/get DLBM_BACKVIDEO layer, then test for flipping support by issuing a layer->Flip. If unimplemented, create/get DLBM_BACKSYSTEM if no YV12 blit bug. Then test for flipping support by issuing a layer->Flip. If unimplemented, then create/get DLBM_FRONTONLY layer. Tony -- Info: To unsubscribe send a mail to firstname.lastname@example.org with "unsubscribe directfb-dev" as subject.