On Tue, Jun 15, 2004 at 12:51:03AM +0200, Stefan Lucke wrote: > On Dienstag, 15. Juni 2004 00:15, Ville Syrj�l� wrote: > > On Tue, Jun 15, 2004 at 12:01:59AM +0200, Stefan Lucke wrote: > > > I've a question how to realize some sort of cropping > > > with SetScreenLocation ( .. ). > > > > > > My test stream has a 4:3 frame encoded as 16:9 anamorphic mpeg2 frame. > > > To display this correct on a 4:3 or 5:4 display, a center out operation has to be > > > done. > > > > > > Is such a operation possible with SetScreenLocation ? > > > > I'm not exactly sure what you mean. > > Let's say the decoded picture is of size 720x576. It is anamorphic 16:9. > But I know (AFD descriptors tell that) the active area is of 4:3 format. So > only this area should be drawn on a 4:3 screen in full size. Without doing > that I would get black bars on top and bottom due to 16:9 scaling and > black bars left and right, since the active area is 4:3. > > > Do you want to resize the image so > > that parts of it go outside the visible screen? > > No (virtual yes). I want to draw a part of picture so that it fills the screen. > With Xv output it is easy. There I can specify source x and y offsets and > source width and height witch should be drawn at a given destination area. > With Xv-X11 this works with matrox and radeon and I think with others too.
DirectFB doesn't have any method of specifying source cropping for layers. It would be a useful thing to add though. But you since you're looking to fill the entire screen you don't actually need source cropping. SetScreenLocation() will suffice provided that the driver crops things properly. You just have to calculate the coordinates and size accordingly. -- Ville Syrj�l� [EMAIL PROTECTED] http://www.sci.fi/~syrjala/
