On Sat, Feb 01, 2020 at 08:29:10AM -0800, Aaron Jensen wrote:
> On Sat, Feb 1, 2020 at 6:22 AM Alan Third <alan@idiocy.org> wrote:
> >
> > I’m now stumped because I can’t actually find any image type in the
> > documentation that isn’t immutable. I’m sure there must be something.
> > The Mac port appears to be using IOSurfaces, but as far as I can tell
> > they can be changed underneath you so aren’t much use for just
> > updating little bits of the Emacs frame at a time. I must be
> > misunderstanding something.
> 
> I know nothing, but have you looked into
> https://developer.apple.com/library/archive/documentation/GraphicsImaging/Conceptual/drawingwithquartz2d/dq_layers/dq_layers.html
> ?

Can you try the attached patch? It looks like it’s faster here, but I
can’t really tell.
-- 
Alan Third