Le mardi 09 février 2010 à 12:07 +0800, Justin Hou a écrit : > But I still confused. This is my steps to use SetVideoMode > > 1, initialize video mode to 1920 x 1080 > 2, initialize osd (or frame buffer) > 3, create DFB > 4, create the primary surface. > 5, blit an image to primary surface. > > 6, initialize video mode to 1280 x 720 > 7, call SetVideoMode to set primary surface to 1280 x 720 > 8, blit the image to primary surface again. > > My questions: > 1, If in the primary surface is not only an image, but more complex UI. > How can it be displayed immediately?
What do you mean by immediately ? > 2, Does it mean I have to hold a surface to prepare all the UI, and blit > it to primary when needed? It's not make sense, because primary can be a > double buffer surface and always blit the changing to the back buffer It depends if you're using windows or not. When using windows, the primary surface is the buffer where all the windows gets composited the build the final image you see on the screen. In this case you can't use the primary surface to draw in, because each time the content of a window gets updated, it will erase a part of the primary layer to replace it with the window content. > > Thanks for your comments. > > Regards! > > Justin > > > > On 2010-2-9 8:53, Justin Hou wrote: > > Hi, Niels, > > Oh, I get it. Thanks. > > I'm working on an embedded system. If it works, I could ask the > > system guys create this file. > > Regards. > > -Justin > > > > On 2010-2-8 21:56, Niels Roest wrote: > >> Hi Justin, > >> > >> /etc/fb.modes is not part of DirectFB, but of the generic framebuffer > >> framework of linux. > >> on my system I can do "man fb.modes" and get an explanation of the > >> contents. > >> > >> Greets > >> Niels > >> > >> Justin Hou wrote: > >>> Hi, guys, > >>> > >>> I'm trying to use SetVideoMode interface, to change the video > >>> mode dynamically, but failed. After some tracing, I found a file > >>> named /etc/fb.modes is needed. I think I should create this file and > >>> describe what kind of modes my chip supports. > >>> Could someone give me a simple about this file? > >>> Thanks very much! > >>> > >>> -Justin > >>> > >>>> _______________________________________________ > >>>> directfb-dev mailing list > >>>> directfb-dev@directfb.org <mailto:directfb-dev@directfb.org> > >>>> http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev > >>>> > >>>> > >>> > >>> ------------------------------------------------------------------------ > >>> > >>> > >>> _______________________________________________ > >>> directfb-dev mailing list > >>> directfb-dev@directfb.org > >>> http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev > >> > >> > > > > _______________________________________________ > > directfb-dev mailing list > > directfb-dev@directfb.org > > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev > > _______________________________________________ > directfb-dev mailing list > directfb-dev@directfb.org > http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
