[directfb-dev] Re: possible directfb bug

[Alex SONG <zzaleson@uqconnect.net>]

On Wed, 12 Jun 2002, Denis Oliver Kropp wrote:

<snip>

> It's not a bug, it's just a stupid heuristic. Imagine the following sequence:
>
> Action                              | S | V |
> ---------------------------------------------
> Surface created                     | + | . |
> Software writes to surface          | + | . |  writes to system memory
> Software stretch blits from surface | + | . |  reads from system memory
> Hardware blits from surface         | + | + |  copied to video memory
> Software writes to surface          | - | + |  writes to video memory
> Software stretch blits from surface | - | + |  reads from video memory
>
> S = system memory instance
> V = video memory instance
> . = invalid (not allocated)
> + = stored (allocated, contains recent data)
> - = restore (allocated, but data is outdated)

i understand now, is there anyway to fix this ? is it possible to copy the
data back to system memory when the software stretchblit detects that the
surface is in video memory ?

thank you very much for your help and detailed explainations.

cheers,

alex



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