On Tue, 2014-06-24 at 19:14 -0600, Jean-Yves Avenard wrote: > Hi > > On 25 June 2014 11:07, Zhao, Yakui <[email protected]> wrote: > >> To have a 1440x1080 video properly scaled, I need to call vaPutSurface > >> with: > >> va_status = vaPutSurface(m_display->m_va_disp, surface, > >> pic->m_pixmap, > >> 0, 0, > >> m_size.width(), m_size.height(), > >> 0, 0, > >> 1014, 576, //m_size.width(), m_size.height(), > >> NULL, 0, > >> field); > >> > > > > The vaPutSurface contains two groups of parameters to determine how to > > display the corresponding video. > > >Src rectangle: This determines the region of source region. > > >Dest rectangle: This determines where the video is displayed on the > > target window/pixmap > > > > Under some scenarios the dimension of the video source is different with > > that of the target window/pixmap. In such case it will use the > > width/height ratio of the source video to calibrate the corresponding > > dest region, which is to avoid the stretching. > > Of course you can use any region to display it if the stretching doesn't > > matter. > > Thanks for your answer. > > However, it doesn't make much sense to me. > I'm already making use of the src and dest rectangle as you can see in > my snippet above. > > And more importantly, the GL viewport of the destination rectangle is > set to be of the dimension of the source rectangle. > > There should be no stretching, scaling to be done of any kind, seeing > that source rectangle and destination rectangle are of the same > dimension.
As we mentioned in the previous email, the dest region parameter of vaPutSurface determines where it is displayed on the target window/pixmap. But one note is that the target window/pixmap is not directly displayed instead it is managed/composed by the window manager. Maybe the window manager will do some stretching although vaPutSurface doesn't do the stretching. > > Yet, somehow, vaPutSurface doesn't respect that and apply some > stretching magic I'm yet to comprehend _______________________________________________ Libva mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/libva
