Blit from the primary to another surface is very slow, if there is any problem
in my code?
I tried the following code.
==========================================================
......
IDirectFBSurface *tempSurface;
dfb->CreateSurface (dfb, &dsc, &tempSurface); /* The tempSurface is not
primary. */
......
while (...)
{
......
primary->FillTriangle(....);
primary->DrawLine(....);
.....
primary->Flip
(primary, NULL, DSFLIP_ONSYNC); /* Filp here because I want to
save the primary surface to tempSurface. Is my thought correct? */
tempSurface->Blit(tempSurface, primary, NULL, 0, 0);
primary->Blit(primary, tempSurface, NULL, 200, 200); /* Offset the previous
screen. */
primary->Flip (primary, NULL, DSFLIP_ONSYNC); // Main loop flip
......
}
......
==========================================================
This loop had 0.5 second delay when "tempSurface->Blit(tempSurface,
primary, NULL, 0, 0)" was executed. If I commented this line, no
delay. Does anyone know the reason?
Thanks a lot!
Jack
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