Bug Hunting Session
Bug 123360 - Antialiasing not great for PNG images depending on zoomlevel without OpenGL enabled
Summary: Antialiasing not great for PNG images depending on zoomlevel without OpenGL e...
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: graphics stack (show other bugs)
Version:
(earliest affected)
4.4.7.2 release
Hardware: All Windows (All)
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: Writer-Images
  Show dependency treegraph
 
Reported: 2019-02-11 15:42 UTC by Telesto
Modified: 2019-03-28 18:28 UTC (History)
3 users (show)

See Also:
Crash report or crash signature:


Attachments
Example file (3.16 MB, application/vnd.oasis.opendocument.text)
2019-02-11 15:43 UTC, Telesto
Details
Example file (231.74 KB, image/png)
2019-02-11 15:43 UTC, Telesto
Details

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Description Telesto 2019-02-11 15:42:42 UTC
Description:
Antialiasing not great for PNG images depending on zoomlevel without OpenGL enabled.. Based on bug 86675 

Steps to Reproduce:
1. Open the attached file
2. Zoom out (for me 90%)

Actual Results:
Letters lines appear to thin

Expected Results:
Same look as the jpg


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 6.3.0.0.alpha0+
Build ID: 0b21f6556b6fff76290d1095089da89532365215
CPU threads: 4; OS: Windows 6.3; UI render: default; VCL: win; 
Locale: nl-NL (nl_NL); UI-Language: en-US
Calc: C
Comment 1 Telesto 2019-02-11 15:43:09 UTC
Created attachment 149159 [details]
Example file
Comment 2 Telesto 2019-02-11 15:43:37 UTC
Created attachment 149160 [details]
Example file
Comment 3 Luboš Luňák 2019-03-28 12:59:56 UTC
- This only shows with OpenGL disabled either on Windows, or on Linux with the "gen" vcl plugin (SAL_DISABLEGL=1 SAL_USE_VCLPLUGIN=gen). So this shouldn't be a dependency of the VCL-OpenGL bugreport. Given that we default to OpenGL on Windows and on Linux pretty much nobody uses the gen plugin, most users shouldn't be affected.

- It is related to bug #80498. Presumably reverting that fixes this but reintroduces that problem. Making the image lose the alpha channel should also avoid the problem.
Comment 4 Telesto 2019-03-28 18:28:41 UTC
(In reply to Luboš Luňák from comment #3)
> - This only shows with OpenGL disabled either on Windows, or on Linux with
> the "gen" vcl plugin (SAL_DISABLEGL=1 SAL_USE_VCLPLUGIN=gen). So this
> shouldn't be a dependency of the VCL-OpenGL bugreport. Given that we default
> to OpenGL on Windows and on Linux pretty much nobody uses the gen plugin,
> most users shouldn't be affected.

Small note on that. The default is OpenGL. However the driver blacklist is quite long. For example: Intel OpenGL issues where fixed by blacklisting them (not quite up to date with the current situation, though).

The crash reporter shows quite some report on Windows without OpenGL enabled, but could be a coincidence. Some states would be nice :-).