Hmmm... well caught.
The DSCAPS_DOUBLE is because of the IDirectFBSurface_Window_Construct in
idirectfbwindow.c containing it.
However, this parameter is not used because a 'window' surface does not
use IDirectFBSurface_Flip but instead uses IDirectFBSurface_Window_Flip
as the 'Flip' implementation, which does not look at the caps field to
determine flipping strategy - it simply reserves a single buffer always.
I guess the DOUBLE is a remnant to convey the resulting behaviour rather
than the actual implementation.
Not planning to change this, unless there is a need.
Greets
Niels
anders.bak...@nokia.com wrote:
_______________________________________
From: ext Niels Roest [ni...@directfb.org]
Sent: Saturday, March 27, 2010 3:16 AM
To: Bakken Anders (Nokia-D-Qt/RedwoodCity)
Cc: directfb-dev@directfb.org
Subject: Re: [directfb-dev] single buffered windows
How come you have double buffered windows?
Afaik, windows are default single buffered.
If you change the content of a window, the layer buffer is only updated
when you do a window->Flip after your change - this copies the updated
area from the window buffer to the layer buffer (generally the back
buffer followed by a implicit flip, if your layer is double buffered)
Greets
Niels
Hi Niels
That seems to what DirectFB is giving me. I use the attached example and the
output is:
12 DSCAPS_DOUBLE 1
This is running 1.4.3 and system=x11
regards
Anders
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