[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

--- Comment #7 from Telesto  ---
Created attachment 137812
  --> https://bugs.documentfoundation.org/attachment.cgi?id=137812=edit
Example file

To keep this (nota) bug 'complete', a different, more regular document issue:
1. Open the attached file
2. Select the vertical scroll bar, left click & hold, scroll up and down.
Scrolling behavior isn't that great in LibO6

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

Buovjaga  changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 CC||todven...@suomi24.fi
 Resolution|--- |NOTABUG

--- Comment #6 from Buovjaga  ---
Yep, I think without an identified target in the code, we can't keep this open.
Closing.

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

--- Comment #5 from V Stuart Foote  ---
(In reply to Telesto from comment #4)
> 
> Setting GDI/GDI+ to default for the time being, dropping the 'active'
> support for OpenGL, and focus more on accelerated hardware seems a logical
> conclusion (to me)

The route for hardware accelerating Windows builds would be through native
DirectX and DirectWrite _not GDI+_ or legacy Uniscribe. 

The truth is, legacy GDI+ and GDI native implementation is becoming more
unmaintainable as Microsoft moves the platform away from it.

But cross-platform we've moved to HarfBuzz, and are looking at Freetype, with
some skia support, as replacements for DirectWrite rendering on Windows. 

Similar choices in non-native implementations for macOS Quartz have been made.

Its all pretty messy--but resources of the project prevent doing "native"
development for the supported platforms.

What can be done for the project is OpenGL implementation based.

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

--- Comment #4 from Telesto  ---
I'm only the messenger; don't take it personally.. I'm only trying to make
aware about less snappy scrolling behaviour.

I reported this because it would bug me as user, when using LibreOffice in
OpenGL mode.
They problem is that every performance loss is noticeable, because they
rendering is - in my experience on Windows - slowish in general. Even before
the identified commit.

Sometimes I wonder why OpenGL - when available - should be the default on
Windows anyway. They performance isn't great. Only a few people at the bug
tracker have OpenGL available. It's consuming limited resources 

Setting GDI/GDI+ to default for the time being, dropping the 'active' support
for OpenGL, and focus more on accelerated hardware seems a logical conclusion
(to me)

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

V Stuart Foote  changed:

   What|Removed |Added

Version|5.2.0.4 release |5.1.0.3 release
 Blocks||93529

--- Comment #3 from V Stuart Foote  ---
Double buffering with OpenGL commit for bibisect comment 1 went in at 5.1.0.1.

In fact lack of double buffering continues to plague default rendering, e.g.
bug 105863 or bug 112889


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=93529
[Bug 93529] [META] VCL/OpenGL rendering tracker bug for 5.0+
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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

V Stuart Foote  changed:

   What|Removed |Added

 CC||vstuart.fo...@utsa.edu

--- Comment #2 from V Stuart Foote  ---
So what if OpenGL lags a little, as cross platform it is moving performance
forward onto accelerated hardware in a reasonably consistent fashion. 

I don't think it is fair to compaare OpenGL to legacy GDI/GDI+ with all its
warts. For more meaningful performance gains on Windows builds we would have to
implement native DirectX 11 with Direct2D, DirectDraw even DirectCompute, and
also support WDDM driver features. It would make the GUI more stable and
perform better, but is way out of scope.

Obviously that is not going to happen.

So IMHO => NAB

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

Telesto  changed:

   What|Removed |Added

   Keywords||bibisected, bisected, perf

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

--- Comment #1 from Telesto  ---
Created attachment 137522
  --> https://bugs.documentfoundation.org/attachment.cgi?id=137522=edit
Bibisect log

Bisected to:

author  Michael Meeks  2015-11-13 12:00:59
(GMT)
committer   Michael Meeks  2015-12-11
11:39:55 (GMT)
commit  7bc1f1285e82982b5d900f54f3c6f877517598b8 (patch)
treef055198ff7acfa3cf2fac695186452530d539f19
parent  93185f720aab0e58564c050ea3518746d8597803 (diff)
tdf#93529 - move to a Mac-like double-buffered OpenGL model.
This moves us to always rendering to an off-screen texture, and then
(at idle) blitting this to the screen & swapping buffers. Ideally we
should never see any rendering, or flicker again with this approach.

Several fixes are included:
   + avoid multiple OpenGL contexts being created for the same window,
 created excessive flicker problems.
   + de-virtualize UseContext - which context we use is less critical.
   + kill 'mbOffscreen' distinction - all VCL rendering is offscreen.
   + implement 'doFlush' and high priority idle flushing.
   + bind stencil buffer for clipping vs. textures - fixing complex
 clopping when rendering to virtual-devices, and off-screen.
   + document environment. variables.
   + use white as default background glClear color, but red or
 random color for DBGUTIL.

Based on using Page Down (the buffering can be noticed)

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[Libreoffice-bugs] [Bug 113649] Editing: The latency while scrolling with OpenGL enabled is a bit to high

[bugzilla-daemon]

https://bugs.documentfoundation.org/show_bug.cgi?id=113649

Telesto  changed:

   What|Removed |Added

Summary|Editing: The latency while  |Editing: The latency while
   |scrolling with OpenGL   |scrolling with OpenGL
   |enabled is a bit to high|enabled is a bit to high
   |with OpenGL |

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