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[directfb-dev] Re: how to CreateSurface on CRTC2 layer for G400
On Sun, Dec 15, 2002 at 09:37:30AM -0500, firstname.lastname@example.org wrote: > I am trying to coerce SDL compiled with DirectFB to display on the > G400's CRTC2. The app. that I am trying to display on SDL DirectFB is > freevo. > > All of the code examples of using CRTC2 that I have seen show creating > a DirectFB context, then getting layer 2 of this context, and then > getting the surface from the layer: > > DirectFBCreate(&dfb); > dfb->GetDisplayLayer(dfb, 2, &crtc2); > crtc2->GetSurface(crtc2, &c2frame); > > This makes sense to me. SDL however, _creates_ a surface (with > CreateSurface()) directly on the DirectFB context: > > DirectFBCreate(&dfb); > dfb->GetDisplayLayer(dfb, 2, &layer); > dfb->CreateSurface(dfb, &dsc, &surface); > > and then operates on this surface. > > I have tried to replace the CreateSurface() with a GetSurface() but I > wind up getting a segfault in the application. Should a > GetSurface(layer, ...) be substitutable for a > CreateSurface(DFBContext, ...) or is it more complicated than that? Yes if CreateSurface() had DSCAPS_PRIMARY. Otherwise the surface is not related to any specific layer in which case you should keep using CreateSurface(). Perhaps the code assumes something about the surface size. CRTC2 surface has a fixed size so you'll have to make sure the code understands that. > I have already had to hack SDL to use layer 2 rather than DLID_PRIMARY > like I did with GTK+DirectFB, but this CreateSurface() has me puzzled. > If CRTC2 is implemented as an additional layer on the DirectFB > context, then how can CreateSurface() know which layer to create the > surface on? It doesn't. If you use CreateSurface() with DSCAPS_PRIMARY you are doing the same thing as primary_layer->GetSurface(). With other layers you must use GetSurface(). -- Ville Syrjälä email@example.com http://www.sci.fi/~syrjala/ -- Info: To unsubscribe send a mail to firstname.lastname@example.org with "unsubscribe directfb-dev" as subject.