[directfb-users] DFB-SDL speed issue

[Ulrich von Zadow]

I've got a DFB display mixer here that renders quickly in fullscreen 
mode and slows down when rendering via SDL.

More precisely, I'm doing software rendering in both cases. I'm 
compositing stuff on a backbuffer and then blitting the changed regions 
to the front buffer each frame. Everything except the front buffer is in 
system memory. In fullscreen mode, this works perfectly, and I'm getting 
the rendering speeds I expect. When I use SDL, it seems that 
DLBM_FRONTONLY has no effect - I need to do an additional Flip of the 
primary surface. That flip obviously isn't a real flip, it blts the 
complete backbuffer to the frontbuffer instead :-(.

Is there any way I can blt to the real frontbuffer using the SDL backend?

  Uli



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