[cairo] [RFC] Pixman & compositing with overlapping source and destination pixel data

[Soeren Sandmann]

Siarhei Siamashka <siarhei.siamashka at gmail.com> writes:

> write-through cache for it (with a simple kernel patch) improves scrolling
> and moving windows performance by 4x-5x factor (unless shadow framebuffer is
> used, which is also not good for performance). 

What is the issue with the shadow framebuffer? It does add some extra
memory traffic from the final copy, but I would have thought that
everything else becoming much faster, would more than make up for it.


Soren