The dsc is
================================================================
......
primary->GetSize (primary, &screen_w, &screen_h);
dsc.flags = DSDESC_CAPS | DSDESC_WIDTH | DSDESC_HEIGHT;
dsc.caps = DSCAPS_NONE;
dsc.width = screen_w;
dsc.height = screen_h;
......
dfb->CreateSurface (dfb, &dsc, &tempSurface);
tempSurface->SetBlittingFlags (tempSurface, DSBLIT_NOFX);
......
================================================================
Thanks.
Jack
>
> "Lionel Landwerlin" <llandwer...@gmail.com>
> Le mercredi 28 octobre 2009 à 15:49 -0700, Jack W a écrit :
>
> How did you fill the dsc structure ?
>
>
--- On Wed, 10/28/09, Jack W <ji...@yahoo.com> wrote:
From: Jack W <ji...@yahoo.com>
Subject: [directfb-dev] Blit is slow (modified post) - Re: How to save the
current framebuffer to a surface?
To: directfb-dev@directfb.org
Date: Wednesday, October 28, 2009, 6:49 PM
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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