Dear all,

I've create a primary surface for blitting image surface onto it.
DFBSurfaceDescription desc;
desc.flags = DSDESC_CAPS;
desc.caps = DSCAPS_PRIMARY;
dfb->CreateSurface(dfb, &desc, &primary);
//...skip
primary->Clear(primary, 0x00, 0x00, 0x00, 0x00);
primary->Blit(primary, surface, NULL, 0, 0);

The clear function of IDirectFBSurface does not work. And I don't want to
use flip function
Because Flip function cost CPU usage a lot.
How can I clear a surface without flipping the surface?
Thanks.

-- 
Chien Kuo-Feng
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