Re: Heads-up: Potentially breaking changes to the GDK drawing model pushed

[Morten Welinder <mortenw gnome org>]

Argh!

Will the stream of ABI changes never end?

Gnumeric uses this to provide a walking-ant cursor large selected areas -- areas
too big for processing in the normal paint loop.

Morten





On Fri, Jun 20, 2014 at 9:00 PM, Jasper St. Pierre
<jstpierre mecheye net> wrote:
> To better support Wayland with fewer copies and less drawing artifacts, I've
> pushed some potentially breaking changes to GDK, namely around
> gdk_cairo_create and gdk_window_begin_paint_region.
>
> https://git.gnome.org/browse/gtk+/commit/?id=d48adf9cee7e340acd7f8b9a5f9716695352b848
> https://git.gnome.org/browse/gtk+/commit/?id=be30e440c350f0f3e0f2572f7f3eab54ef96af0e
>
> With these changes, it is now illegal to call gdk_cairo_create outside of a
> begin_paint / end_paint. This was always sketchy, and would never work on
> Wayland anyway. If your code does this, we will print a warning and return a
> dummy surface which won't ever be composited back into the main surface.
>
> Additionally, it is now forbidden to call gdk_window_begin_paint_region more
> than once. Previously, the code had a "paint stack" which tracked paints,
> but since GTK+ never used this codepath it was never actually tested and was
> indeed broken on Wayland due to the way the Wayland backend was written.
> Again, we will print a warning in this case and return.
>
> As part of these changes, gtk_widget_set_double_buffered was deprecated and
> removed. Again, it will never work on Wayland, as that is natively
> double-buffered, and it would simply break there.
>
> I tested with some local big applications like Ardour and the GNOME
> applications, but don't have a GTK+3 build of Firefox, LibreOffice, Eclipse,
> or any big GTK+ apps like Inkscape or The GIMP.
>
> Please double-check to make sure your apps still work fine. If you have a
> problem with any of this or I broke your apps by accident, please reply and
> I'll try to fix it.
>
> Thanks!
>
> --
>   Jasper
>
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