Blit from the primary to another surface is very slow, if there is any problem
in my code?
I tried the following code.
==========================================================
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? */
IDirectFBSurface *tempSurface;
dfb->CreateSurface (dfb, &dsc, &tempSurface); /* The tempSurface is not
primary. */
tempSurface->Blit(tempSurface, primary, NULL, 0, 0); /* Offset the previous
screen. */
primary->Blit(primary, tempSurface, NULL, 200, 200);
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
--- On Mon, 10/26/09, Jack W <ji...@yahoo.com> wrote:
From: Jack W <ji...@yahoo.com>
Subject: Re: [directfb-dev] How to save the current framebuffer to a surface?
To: "haithem rahmani" <haithem.rahm...@gmail.com>
Cc: directfb-dev@directfb.org
Date: Monday, October 26, 2009, 6:44 PM
I mean the current screen is the current flipped framebuffer (ex. I draw some
triangles on the primary surface).
I found a method. That is Blit the primary surface to a temp surface, then
StrechBlit this temp surface back to the primary surface. It works. Does
anyone have other solution?
Jack
--- On Mon, 10/26/09, haithem rahmani <haithem.rahm...@gmail.com> wrote:
From: haithem rahmani <haithem.rahm...@gmail.com>
Subject: Re: [directfb-dev] How to save the current framebuffer to a surface?
To: "Jack W" <ji...@yahoo.com>
Cc: directfb-dev@directfb.org
Date: Monday, October 26, 2009, 7:21 AM
Hi,
where does the current screen content come from ?
regards.
On Mon, Oct 26, 2009 at 7:28 AM, Jack W <ji...@yahoo.com> wrote:
Hi All,
I want to save the current screen (framebuffer) (say 1280x1024) to a surface
and then display this surface in a small area (say 600x400, StrechBlit) in the
next frame. How to do that? Or does any other method can display the previous
screen?
BTW, I saw many nice DFB application screenshots on www.directfb.org. How can I
download these example codes?
Thanks a lot for help!
Jack
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