Issue 101402 - Slide show: comb slide transition is slow on Windows
Summary: Slide show: comb slide transition is slow on Windows
Alias: None
Product: Impress
Classification: Application
Component: viewing (show other issues)
Version: DEV300m45
Hardware: All All
: P3 Trivial with 1 vote (vote)
Target Milestone: ---
Assignee: AOO issues mailing list
QA Contact:
Depends on:
Reported: 2009-04-28 10:38 UTC by groucho266
Modified: 2017-05-20 11:11 UTC (History)
1 user (show)

See Also:
Issue Type: DEFECT
Latest Confirmation in: ---
Developer Difficulty: ---


Note You need to log in before you can comment on or make changes to this issue.
Description groucho266 2009-04-28 10:38:00 UTC
The comb (horizontal) slide transition is relatively (when compared to other
transition types) on Windows.

How to reproduce:
1. Create new Impress document
2. Create one more slide.
3. Change background of new slide color to black.
4. Assign slide transition effect "Comb Horizontal" to second slide.
5. Start presentation and hit space to start transition.

Animation is more jerky then with other transition types.

It takes more than 100ms to render each frame.
Comment 1 groucho266 2009-04-28 10:45:17 UTC
The strange/funny part about this bug:
When you turn hardware acceleration off then rendering frames for this type of
transition animation becomes faster. 
That is because the VCL canvas, that is used as non-hardware accelerated canvas,
uses GDI (no plus) for painting bitmaps.  This IS hardware accelerated.
The DirectX canvas uses GDI+ for painting bitmaps.  This is NOT hardware

One way to fix this is to use DirectX to paint bitmaps.
Comment 2 groucho266 2009-09-25 09:27:53 UTC
Changing target to OOo 3.3.
Comment 3 groucho266 2010-07-07 15:42:29 UTC
Changing target due to time constraints.
Comment 4 groucho266 2011-02-08 16:11:27 UTC
Changing target.
Comment 5 Marcus 2017-05-20 11:11:16 UTC
Reset assigne to the default "".