https://bugzilla.gnome.org/show_bug.cgi?id=772075
--- Comment #3 from Gustavo Noronha (kov) <[email protected]> ---
Created attachment 338532
--> https://bugzilla.gnome.org/attachment.cgi?id=338532&action=edit
css shadows: repeat a painted surface rather than masking
After further investigating, it seems like doing a repeat masking is much
slower than a repeat paint operation. Using an intermediate surface and
repeating it improves performance a lot - I can now resize terminal and
browser windows without hiccups, and the pixbufs demo runs much better.
I still see a lot of overhead caused by the mixing of GL and 2D cairo in some
test cases (such as
https://webkit.org/blog-files/3d-transforms/poster-circle.html), but the
overhead caused by painting shadows pretty much disappears from
my profiles (I'm testing mainly with gtk 3.20 on Fedora 24, but tried the patch
on master as well).
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