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Hi all, we are experencing strange behaviour in the Blit and Flip
function. Basically if I set the primary surface with this DFBSurfaceDescription: dsc.flags = DSDESC_CAPS; dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING; Then when I execute blit function on this primary surface nothing appears on the display as expected, but, as far as I understood, I can execute the flip function with the option: DFBCHECK (primary->Flip (primary, NULL, DSFLIP_NONE)); I expected this function to Flip immediatly, because I setted the NONE option, while it seems to wait for some sort of shyncronization. For sure the execution is extremely slow. On the other hand when I set the Surface description with this option: dsc.caps = DSCAPS_PRIMARY | DSCAPS_NONE; then the execution is 10 times faster... How is this possible, am I doing something wrong? Furhtermore when I enable the alphachannel for the primary surface, by setting the blitting flags to "DSBLIT_BLEND_ALPHACHANNEL" the flip/blit performances slow extremely down... How can I improve this performance? Many thanks in advance, Francesco. --
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