After some investigation (and some DirectFB source code reading) I
understood a bit more from my problem, I believed that DirectFB was using
Fusion between the 2 threads that instantiates DirectFB different contexts,
but I was wrong, because the process that call the two DirectFB contexts was
the same, I noticed that the DirectFB context will be the same, because the
DirectFB super interface is a singleton and nothing to do with Fusion
(because I have only one process), the problem occurs when the thread that
decodes the video needs restart the DirectFB for some internal event and
reconfigures your surfaces without transparency and the other thread don't
know that this occured, the consequence that the video was placed over the
graphics.
There's some way to configure my graphic surface to be always placed
over the graphic surface create after by other DirectFB initialization ?
Thanks for all help
Flavio Alberto Lopes Soares
2010/5/20 Flavio Alberto Lopes Soares <[email protected]>
> Hello all,
>
> I'm writing an application that starts a thread that uses DirectFB to show
> video, and my code shows some graphic information over this video, my
> application cannot access the DirectFB context of this thread and I'm using
> Fusion to create other DirectFB context to draw my DFB graphics, my code are
> initialized after the video thread and my graphic are shown OK over the
> video but in some situations the video thread needs reinitialize/reconfigure
> DFB context and my own DFB context don't know that this ocurred and cannot
> be reinitialized, there's some way to force my DFB context be always shown
> over the video even the first Directfb context was reinitializated ?
>
> My DirectFB initialization code snippet are bellow :
>
> int
> BackendDFB::initialize()
> {
> int result = 0;
> bckType = BACKEND_TYPE_DIRECTFB;
> dfbPicDescriptor = 0;
> dfbFontDescriptor = 0;
> fprintf(stderr, "Initializing DirectFB...\n");
> if( DirectFBInit(NULL, NULL) != DFB_OK ) {
> fprintf(stderr, "Error initializing DirectFB.\n");
> result = -1;
> } else {
> fprintf(stderr, "DirectFB initializing OK, creating DFB
> superinterface...\n");
> if( DirectFBCreate( &dfb ) != DFB_OK ) {
> fprintf(stderr, "Error creating DFB super interface.\n");
> result = -2;
> } else {
> dfb->EnumDisplayLayers(dfb, dfbDisplayLayerCallback, this);
>
> pictMap = new PictureMap();
> createDFBmainSurface(false); /*false - create surface without
> create window and layer*/
> }
> }
>
> return result;
> }
>
> int
> BackendDFB::createDFBmainSurface(bool fromMainWindow)
> {
> int result = 0;
>
> if ( ! dfb )
> return -1;
>
> if (wsurface) {
> wsurface->Release(wsurface);
> wsurface = NULL;
> }
>
> if (fromMainWindow) {
> if (window)
> window->GetSurface(window, &wsurface);
> else
> result = -1;
> } else {
> memset(&dsc, 0, sizeof(DFBSurfaceDescription));
> dsc.flags = DFBSurfaceDescriptionFlags(DSDESC_CAPS |
> DSDESC_PIXELFORMAT);
> dsc.caps = DFBSurfaceCapabilities(DSCAPS_PRIMARY |
> DSCAPS_VIDEOONLY |
> DSCAPS_PREMULTIPLIED |
> DSCAPS_FLIPPING);
> dsc.pixelformat = DSPF_ARGB;
>
> dfb->CreateSurface( dfb, &dsc, &wsurface );
>
> if (wsurface) {
> int w, h;
> wsurface->GetSize (wsurface, &w, &h);
> setWindowDimensions(0, 0, w, h);
> }
> }
>
> if (wsurface) {
> wsurface->SetBlittingFlags( wsurface,
> DFBSurfaceBlittingFlags(DSBLIT_BLEND_ALPHACHANNEL));
> wsurface->SetPorterDuff( wsurface, DSPD_SRC_OVER );
> wsurface->SetDstBlendFunction(wsurface, DSBF_INVSRCALPHA);
> wsurface->SetDrawingFlags(wsurface, DSDRAW_BLEND);
> wsurface->Clear(wsurface, 0x00, 0x00, 0x00, 0x00);
> } else
> result = -2;
>
> return result;
> }
>
> And I will update the screen I use this function :
> void
> BackendDFB::update_screen()
> {
> if (wsurface)
> wsurface->Flip(wsurface, NULL, DSFLIP_ONSYNC);
> }
>
> Thanks for all help
> Flávio Alberto Lopes Soares
>
>
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