Lloyd Sargent wrote: > On Friday 25 April 2008 06:23, Alex Vazquez wrote: >> 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. > > The way the display works the Davinci (pardon me if this is old news) > > your eyeball > | > v > osd <-- affected by other osd layer > | > v > video > > (I've left out the other video layer as it doesn't really work). This works, > however, I had to change the second osd layer outside DFB. > > Long story short: I had an osd layer running with "holes" punched through it > so that you could see the video. I believe the way your are going at it is > incorrect. Think of the second osd layer as a WHOLE different FB (this is how > T.I. implements it). > > The way we punched holes through the OSD layer was by NOT using DFB. (And, > honestly, it isn't that hard to get a pointer to the second OSD framebuffer > and make the changes yourself - just remember that they are 4 bit values).
Actually, only 3 bit are used for alpha, the fourth bit is for blinking. Anyhow, DirectFB manages both OSD planes (RGB + Alpha) itself, transparent to the application which only cares about its ARGB 32bit single plane buffer. -- 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
