From: Jonas Dreßler <verdre@v0yd.nl>
Date: Mon, 10 Feb 2020 14:21:29 +0000 (+0100)
Subject: blur-effect: Add some more documentation about performance
X-Git-Tag: archive/raspbian/50.5-1+rpi1~1^2~777^2^2~99
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=b4d491a4d21f97b7a11a1eaca853d71921916c8f;p=gnome-shell.git

blur-effect: Add some more documentation about performance

Explicitly mention that this effect works best for large blur radii and
can be slow if the blurred actor/image is large and not being scaled.

https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/991
---

diff --git a/src/shell-blur-effect.c b/src/shell-blur-effect.c
index 4a2f8f782..7f1be6b1d 100644
--- a/src/shell-blur-effect.c
+++ b/src/shell-blur-effect.c
@@ -42,7 +42,9 @@
  * # Optimizations
  *
  * There are a number of optimizations in place to make this blur implementation
- * real-time.
+ * real-time. All in all, the implementation performs best when using large
+ * blur-radii that allow downscaling the texture to smaller sizes, at small
+ * radii where no downscaling is possible this can easily halve the framerate.
  *
  * ## Multipass
  *