[Bug 356158] Re: gaussian blur distorted when screen rotated

[Bogdan Butnaru]

** Attachment added: "How it looks when the screen is 90° rotated with respect to how it was when Compiz started"
   http://launchpadlibrarian.net/24859454/incorrect.png

** Description changed:

  Binary package hint: compiz
  
  Hello! I'm running up-to-date Jaunty/amd64, on a self-built desktop with
  an NVidia GeForce 9600 video card, running the NVIDIA GLX Module 180.37.
  (I've got  180.44-0ubuntu1 installed, but haven't rebooted yet, I'll do
  that and update the report.)
  
  Using CCSM I've activated Alpha Blur for all windows, using the Gaussian
  filter with radius 7 and strength 0.2603 (just some random value that
  looked good).
  
  This works correctly until I rotate my screen (I've got a pivot
  monitor). I do the rotation with nVidia's tool, after enabling RandR
  with option "RandRRotation" "True" in my xorg.conf
  
  On rotated screens, the blur is horizontally distorted (it seems at
  least some component is stretched). I assume the screen ratio is
  implicitly represented, perhaps as the size of an intermediary texture,
  and isn't updated on rotations.
  
  This happens the same if the initial state is landscape or portrait: the
  state the screen was in when Compiz was started is correct, and
  90°-rotated states are distorted. If Compiz is restarted with the screen
  rotated, than that rotation state becomes correct and its rotations
  become distorted.
  
+ [Edit:] I've attached screenshots with the two cases. The correct one
+ was done in portrait orientation, the incorrect one in landscape. The
+ window and the icons below are the same, but the wallpaper does not
+ follow the screen rotation so it's different between the two states.
+ 
  Let me know if you need any more info.

-- 
gaussian blur distorted when screen rotated
https://bugs.launchpad.net/bugs/356158
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