Alex Vazquez wrote: > Hi, > > i'm using directfb 1.0. The hardware it runs on supports five layers; > two of them are the video layer and the primary layer. I use the primary > layer to draw a semi-transparent gui (osd) over the video. > > The problem i have is that i don't know how to clear the surface of the > primary layer keeping the transparent effect over the video. The only > way i can clear the primary surface is doing a primary_srfc->Clear > (primary_srfc, 0, 0, 0, 255) but that way i can't see the video through > the primary layer. I guess it has something to do with the layer/surface > configuration. > > This is how i create the primary surface: > > dsc.flags = DSDESC_CAPS; > dsc.caps = DSCAPS_PRIMARY | DSCAPS_FLIPPING; > DFBCHECK(dfb -> CreateSurface(dfb, &dsc, &primary_srfc)); > > DFBCHECK(primary_srfc -> SetDrawingFlags(primary_srfc, DSDRAW_BLEND)); > > DFBCHECK (primary_srfc -> SetBlittingFlags (primary_srfc, > DSBLIT_BLEND_ALPHACHANNEL)); > > Then, i draw things and this is how i try to clear it (i also tried one > more Flip and one more clear): > > DFBCHECK (primary_srfc -> Clear (primary_srfc, 0, 0, 0, 0)); > DFBCHECK (primary_srfc -> Flip (primary_srfc, NULL, DSFLIP_WAITFORSYNC > | DSFLIP_BLIT)); > DFBCHECK (primary_srfc -> Clear (primary_srfc, 0, 0, 0, 0));
The blitting/drawing flags should not influence the Clear(). It could mean that you have a driver which does not handle state changes properly. Did you try "no-hardware"? -- Best regards, Denis Oliver Kropp .------------------------------------------. | DirectFB - Hardware accelerated graphics | | http://www.directfb.org/ | "------------------------------------------" _______________________________________________ directfb-users mailing list directfb-users@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-users
