> Hi all, we are experencing strange behaviour in the Blit and Flip function.
First question - what is your system and gfx hardware ? > 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. If you haven't hardware support then Flip() is copying the data from shadow buffer into video memory. Usually it's very slow operation. > 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... Software blending is more slow than simple copying... > How can I improve this performance? Enable the hardware support for gfx operation if it's possible. -- Best Regards Nikita Egorov [EMAIL PROTECTED] [EMAIL PROTECTED] _______________________________________________ directfb-users mailing list directfb-users@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
