[Libreoffice-bugs] [Bug 144780] New: Anti-aliasing ON + No Transparency + Custom page size = line right and bottom of PNG draw exports

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=144780

            Bug ID: 144780
           Summary: Anti-aliasing ON + No Transparency + Custom page size
                    = line right and bottom of PNG draw exports
           Product: LibreOffice
           Version: 7.2.1.1 rc
          Hardware: All
                OS: Windows (All)
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Draw
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: xordevoreaux at gmail.com

Description:
If I have anti-aliasing on and I enter a custom page size for a drawing
document with no margins when I don't export using transparency, then white /
anti-aliased to white lines appear right and bottom of any PNG export.

If I export using transparency, it's okay.

THE PROBLEM with exporting with transparency is that nothing on a master page
in Windows LO Draw shows up. It's an unfortunate either-or situation:

a. Don't export with transparency and have items on master pages export
b. Export with transparency and no items on master pages export

SO there's two different problems. 

The first problem with transparency / no master was reported here
https://bugs.documentfoundation.org/show_bug.cgi?id=123973

The second problem is what I'm reporting today with the lines right and bottom
of the export based on non-standard page dimensions (the destination program
I'm using that consumes what I'm exporting from LO Draw wants 2048x2048 pixels
EXACTLY which LO draw produces if the dimensions are 21.33″x21.33″). 

Even the slightest deviation from standard page dimensions causes the bug which
I've included in the steps to reproduce.

I am not convinced that the bug I'm reporting today is the same as this bug
https://bugs.documentfoundation.org/show_bug.cgi?id=117160 because that bug had
more to do with SKIA / hardware acceleration only rather than
anti-aliasing+weird page dimensions.








Steps to Reproduce:
1. Launch LO Draw in Microsoft Windows
2. Assure that anti-aliasing in on in Options (Options / General / View)
3. Set the page margins to None
4. Set the page dimensions to something other than default (11x8.5 to 11x8.6)
5. Set the background color of the page to black
6. Export to PNG (no transparency option selected, interlacing irrelevant)
7. Observe the exported PNG right and bottom edges

Actual Results:
A white line (or a line anti-aliased to alpha which appears white) shows up
right and bottom of the exported PNG.

Expected Results:
There should never be any artifacts on the PNG export.


Reproducible: Always


User Profile Reset: No



Additional Info:
Version: 7.2.2.1 (x64) / LibreOffice Community
Build ID: 0e408af0b27894d652a87aa5f21fe17bf058124c
CPU threads: 8; OS: Windows 10.0 Build 19043; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL

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