Created attachment 62988 [details]
This is a composite picture obtained from two screenshots of the same slideshow. The uppert part corresponds to the version with hardware acceleration disabled, the lower part with hardware acceleration enabled.

Problem description: 
Hello,

When I use a custom animation in a slideshow (like using a zoom effect to bring a picture in forefront), as soon as the animation starts and even after it has finished, the fonts used in the slide become slightly fuzzy. This only appears when I enable the hardware acceleration in the LibreOffice options.

I have noticed this behaviour both under Ubuntu 12.04 using the Unity desktop environment and under Mint13 using the Cinnamon environment. Thus, we can not attribute this bug to either Compiz or Clutter.

My graphic card is a Nvidia GeForce 9600M GS and I use the proprietary drivers (currently the version 295.53).

My version of LibreOffice is currently 3.5.3.2 Build ID: 350m1(Build:2).

Steps to reproduce:
1. Enable hardware acceleration under Tools/Options/View
2. Create a slideshow
3. Add some text and one picture in one slide. Link the picture to a custom animation such as Entrance/Zoom/Fast speed/Start on click.
4. Play the slideshow fullscreen

Current behavior:
The fonts used for the text part of the slide become fuzzy.

Expected behavior:
The fonts should remain sharp.

Platform (if different from the browser): 
              
Linux x86_64 Ubuntu/12.04 and Mint 13