> _______________________________________
> 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
#include <directfb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define TEST(call) { result = call; if (result != DFB_OK) { func = #call; goto end; } }
const char *func = 0;
DFBResult result = DFB_OK;
template <typename T>
class Pointer
{
public:
Pointer(T *tt = 0) : t(tt) {}
~Pointer() { if (t) t->Release(t); }
operator T*() { return t; }
T **operator&() { return &t; }
T *operator->() { return t; }
private:
T *t;
};
int main(int argc, char **argv)
{
enum { Width = 1000, Height = 1000 };
Pointer<IDirectFB> dfb;
Pointer<IDirectFBDisplayLayer> layer;
Pointer<IDirectFBWindow> window;
Pointer<IDirectFBSurface> windowSurface;
DFBSurfaceCapabilities caps;
DFBWindowDescription windowDescription;
windowDescription.flags = DFBWindowDescriptionFlags(DWDESC_WIDTH|DWDESC_HEIGHT|DWDESC_POSX|DWDESC_POSY);
windowDescription.posx = 0;
windowDescription.posy = 0;
windowDescription.width = Width;
windowDescription.height = Height;
TEST(DirectFBInit(&argc, &argv));
TEST(DirectFBCreate(&dfb));
TEST(dfb->GetDisplayLayer(dfb, DLID_PRIMARY, &layer));
TEST(layer->CreateWindow(layer, &windowDescription, &window));
TEST(window->SetOpacity(window, 255));
TEST(window->GetSurface(window, &windowSurface));
TEST(windowSurface->GetCapabilities(windowSurface, &caps));
printf("%0x DSCAPS_DOUBLE %d\n", caps, bool(caps & DSCAPS_DOUBLE));
TEST(windowSurface->Clear(windowSurface, 0, 0, 0, 255));
end:
if (result != DFB_OK)
DirectFBError(func, result);
return 0;
}
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