>>If a client really wants to use the transparency, and does not want opaque black bars, it can be the client's responsibility to produce a buffer that can fill the screen.
This is what the client wants to. The Qt app call "hide" function just wants to implement a function like minimize the window. But there is no minimize in fullscreen mode. I think maybe the qtwayland can implement the "hide" to make the window really transparent , not a black screen now. Thank you. Best Regards Nancy 2015-10-02 14:36 GMT+08:00 Pekka Paalanen <ppaala...@gmail.com>: > On Thu, 1 Oct 2015 12:27:21 -0700 > Bill Spitzak <spit...@gmail.com> wrote: > > > On Thu, Oct 1, 2015 at 12:50 AM, Pekka Paalanen <ppaala...@gmail.com> > wrote: > > > > > > The black blanket surface behind the window OTOH allows for direct > > > scanout. If black bars are not visible and the client buffer is > > > completely opaque, it is possible to scan it out without composition by > > > rendering. > > > > > > > There should be some way to detect if the buffer is opaque, in which case > > these optimizations could be done. > > There is, the hint is given by the client: > wl_surface.set_opaque_region. This one we already do in Weston. > > > Thanks, > pq >
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