Hi,
I got following error while executing my sample application:
(!) [Main Thread 0.000] (27229) *** Assertion [surface->num_buffers > 0]
failed *** [../../src/core/surface.h:324 in dfb_surface_get_buffer()]
The problem occurs when I attempt to create window. But it happens only after
cooperative level is switched to DFSCL_EXCLUSIVE or DFSCL_FULLSCREEN.
I have found that when DFSCL_NORMAL cooperative level is switched to
DFSCL_EXCLUSIVE or DFSCL_FULLSCREEN then following actions are performed:
- new layer context is created and activated,
- which causes previous context to be deactivated
- that destroys all buffers attached to previous context.
When a new window is about to be created DirectFB refers to previous layer
context as a primary context,
which assumes that its number of buffers is more than zero and performs
division by number of buffers in function dfb_surface_get_buffer, unless
assertion is enabled
I reproduced such behaviour also using DirectFB 1.4.15.
Could you give me a hint how to prevent such problems? Is there some bug in
DirectFB or do I do something wrong?
Regards,
Sebastian Tron
Here is a sample code:
#include <stdio.h>
#include <unistd.h>
#include <unistd.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
#include <string.h>
#include <direct/clock.h>
#include <direct/debug.h>
#include <directfb.h>
#define DFBCHECK(x...) \
{ \
DFBResult err = x; \
\
if (err != DFB_OK) \
{ \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); \
} \
}
#define TTXT_WIDTH 720
#define TTXT_HEIGHT 288
#define TTXT_DFB_PALETTE_SIZE 64
static IDirectFB *dfb = NULL;
static IDirectFBSurface *dfb_surface_handle = NULL;
static IDirectFBPalette *fb_palette_handle = NULL;
static IDirectFBDisplayLayer *dfb_primary_layer_handle = NULL;
static IDirectFBWindow *dfb_window_handle = NULL;
//-----------------------------------------------------------------------------------------------------------//
int main (int argc, char **argv)
{
DFBDisplayLayerConfig layerConfig;
DFBWindowDescription description;
DFBResult dfb_result = DFB_FAILURE;
DFBCHECK (DirectFBInit (&argc, &argv)) ;
DFBCHECK (DirectFBCreate (&dfb));
/* Switch to EXCLUSIVE level to hide some unwanted distortions on the screen
in further steps */
DFBCHECK (dfb->SetCooperativeLevel(dfb, DFSCL_EXCLUSIVE));
DFBCHECK (dfb->GetDisplayLayer(dfb, DLID_PRIMARY, &dfb_primary_layer_handle));
memset(&description, 0, sizeof(DFBWindowDescription));
description.flags = DWDESC_WIDTH | DWDESC_HEIGHT | DWDESC_POSX | DWDESC_POSY
| DWDESC_OPTIONS | DWDESC_CAPS | DWDESC_SURFACE_CAPS | DWDESC_PIXELFORMAT;
description.width = 720;
description.height = 576;
description.posx = 0;
description.posy = 0;
description.pixelformat = DSPF_LUT8;
description.options = DWOP_ALPHACHANNEL | DWOP_SCALE;
description.caps = DWCAPS_DOUBLEBUFFER | DWCAPS_ALPHACHANNEL |
DWCAPS_NODECORATION;
description.surface_caps = DSCAPS_DOUBLE | DSCAPS_PREMULTIPLIED;
/* This call causes division by zero */
DFBCHECK (dfb_primary_layer_handle->CreateWindow(dfb_primary_layer_handle,
&description, &dfb_window_handle));
dfb->SetCooperativeLevel(dfb, DFSCL_NORMAL);
sleep (5);
if (dfb_surface_handle != NULL)
{
if (fb_palette_handle != NULL)
{
dfb_result = fb_palette_handle->Release(fb_palette_handle);
fb_palette_handle = NULL;
}
dfb_result = dfb_surface_handle->Release(dfb_surface_handle);
dfb_surface_handle = NULL;
dfb_window_handle->Release(dfb_window_handle);
dfb_window_handle = NULL;
}
dfb->Release (dfb);
return 0;
}
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