Jasper St. Pierre wrote: > On Fri, Nov 15, 2013 at 6:17 AM, Martin Gräßlin > <mgraess...@kde.org> wrote: > <snip, because gmane> > > I think the trap that I personally don't want to run into is the case > where we have a compositor that doesn't support SSD coupled to a client > that doesn't support CSD. Nobody can draw the decorations, and at this > point we've engineered the user into a corner. > > For me, the debate about window decorations and Wayland is that we need > *something* to be mandated to be supported. GNOME wants that to be CSD, > and KDE wants that to be SSD.
From Martin's message: "It would require clients to support CSD" What he's advocating is that, yes, everything must include _support_ for CSD. But enabling it at _runtime_ should not be mandatory. > From the GNOME side, we're heavily using CSD features in our apps [0] > (such that we'd probably even ignore the Wayland hint to ignore CSD, > actually), and SSD code in mutter is a large pile of code I would not like > to maintain, as it's quite complicated, so it's natural for us to want to > encourage CSD. And his proposal explicitly allows that. All it is is a communication channel; the compositor politely requesting "I'd prefer [not] to draw the decorations for you" and the application saying "I am [not] drawing my own decorations." Without this, the two sides have no clean way to communicate that information, and to do so requires ad-hoc, hackish attempts to support it at a layer that support does not belong in. With it, at least the left hand and right hand can tell what the other is doing. > I also think that CSD has technical advantages for complex server effects: > if we simply paint surfaces around the window, if we put the window into > e.g. Coverflow Alt-Tab, we won't see seams around the window. (And > personally, I'm of the opinion that any design changes you'd need to make > to apps to make them usable on a touch device vs. regular device stem far > beyond the window decorations they use in the end.) As far as design changes between the devices, those are smaller than you might think (especially with Qt Quick 2 and the work going on with that; see [1] and [2]) > I'm fine with a hint telling apps to not draw decorations, but I'd like to > mandate that CSD is supported by everything. As I noted, Martin's mail said the same thing. > [0] > http://build.gnome.org/ostree/buildmaster/results/tasks/applicationstest/applicationstest/work-gnome-continuous-x86_64-runtime/screenshot-nautilus.desktop.png Link is a 404. [1] http://aseigo.blogspot.com/2012/10/one-code-base-multiple-form-factors.html [2] http://www.notmart.org/index.php/Software/Components_towards_a_new_plasma _______________________________________________ wayland-devel mailing list wayland-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/wayland-devel