Le lundi 28 septembre 2009 à 20:13 -0600, Craig Matsuura a écrit : > I want to get some clarification on the BACKSYSTEM, BACKVIDEO and > FRONTONLY. > > > > Here is my understanding: > > > > BACKSYSTEM uses a virtual framebuffer of the screen (Some place in > RAM) and DirectFB draws on this screen (surface), once a Flip is > called the virtual framebuffer is copied to the Real/Visible > framebuffer.
Yes, in DirectFB, BACKSYSTEM describe a memory part that is not directly displayable by the video device. But after all, it depends of hardware. For some system the video memory is at a particular place in RAM, for some BACKSYSTEM is just like BACKVIDEO. > BACKVIDEO use the off screen video memory and draws in the screen > (surface) that is off screen. When a Flip is called the framebuffer > starting position is changed to the off screen position to make the > screen visible. The next frame is draw on the off screen and the > process is repeated. Yes. > > > > FRONTONLY, draw directly to the visible framebuffer. Yes. > > -- Lionel Landwerlin <lionel.landwer...@openwide.fr> _______________________________________________ directfb-dev mailing list directfb-dev@directfb.org http://mail.directfb.org/cgi-bin/mailman/listinfo/directfb-dev
