Strange.
Rewriting your tests a bit towards C, I do not experience this behaviour...
ptr before == ptr after, and after a flip, it changes.
Note that it is not imposed that the ptr's are always equal; DirectFB
reserves the right to move non-locked memory areas, but I suspect that
this is not the case here.
Greets
Niels
Lionel Landwerlin wrote:
Hello everyone,
I'm using surface locks for some custom graphical engine tests, and
don't understand the following behavior of directfb :
layer->CreateSurface(&surface, DOUBLE_BUFFERED)
surface->Lock (&ptr, CPU_READ|CPU_WRITE);
Here directfb return a ptr = 0x42424242 for example.
Then I execute the following steps :
surface->Unlock()
surface->FillRectangle(0, 0, 42, 42);
surface->Lock(&ptr, CPU_READ|CPU_WRITE);
Here ptr has changed from its previous value.
Why ? I didn't require a Flip.
Should I own the lock all the time ?
Thanks for answers.
--
Lionel Landwerlin
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