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)); which doesn't to anything visible. If i clear with total opacity (0,0,0,255) the screen goes black and i can't see the video. If you need some more info i can provide it. Any help is appreciated. Thanks, -- Alejandro Vazquez Fente
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