https://bugs.documentfoundation.org/show_bug.cgi?id=37559

Mike Kaganski <mikekagan...@hotmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|filter:pdf                  |bisected
           See Also|https://bugs.freedesktop.or |
                   |g/show_bug.cgi?id=66460,    |
                   |https://bugs.freedesktop.or |
                   |g/show_bug.cgi?id=65127,    |
                   |https://bugs.freedesktop.or |
                   |g/show_bug.cgi?id=64100,    |
                   |https://bugs.freedesktop.or |
                   |g/show_bug.cgi?id=65831,    |
                   |https://bugs.freedesktop.or |
                   |g/show_bug.cgi?id=66146     |
           Assignee|libreoffice-b...@lists.free |mikekagan...@hotmail.com
                   |desktop.org                 |

--- Comment #85 from Mike Kaganski <mikekagan...@hotmail.com> ---
The problem caused by following lines in EnhancedCustomShape2d.cxx:

>        if( !bLineGeometryNeededOnly )
>        {
>            // hack aNewB2DPolyPolygon to fill logic rect - this is
>            // needed to produce gradient fills that look like mso
>            aNewB2DPolygon.clear();
>            aNewB2DPolygon.append(basegfx::B2DPoint(0,0));
>            aNewB2DPolygon.setClosed(true);
>            aNewB2DPolyPolygon.append(aNewB2DPolygon);
> 
>            aNewB2DPolygon.clear();
>            aNewB2DPolygon.append(basegfx::B2DPoint(aLogicRect.GetWidth(),
>                                                    aLogicRect.GetHeight()));
>            aNewB2DPolygon.setClosed(true);
>            aNewB2DPolyPolygon.append(aNewB2DPolygon);
>        }

Disabling this codepath stops adding the points. Current AOO code doesn't
contain these lines.

This is added by:

author  Thorsten Behrens <tbehr...@novell.com>  2010-10-26 21:04:44 (GMT)
committer       Thorsten Behrens <tbehr...@novell.com>  2010-10-26 21:04:44
(GMT)
commit  f64ef72743e55389e446e0d4bc6febd475011023
tree    13dacfb392466476bbe647c74520fa1e4eb860af
parent  5e1626f2cf40d4b52128d4464e838b8df0be55a7
> Better shading algo for customshapes, better gradients
> Some custom shapes can have shaded parts, like for example 3d can,
> the bevelled buttons etc. Those shaded colors are calculated
> internally, and have been way off at times. Now using HSV color
> space & the originally documented luminance modifications in steps
> of 10 percent. Compared to MSO, still no 100 percent match, but
> that seems due to gamma correction there.
> Additionally, starting with MSO12, gradients on those shaded surfaces
> look much better; adapted code to display gradients equally nice.
> 
> Note that most of this patch also applies to ooxml import; note as
> well that customshapes from *all* kind of input files (including ODF
> docs) now look different than before; no real way of changing this
> in a backward-compatible way, since behaviour of custom shapes is
> mandated (mostly) by internal tables, and not stored in a file.
> 
> Applies patches/dev300/ppt-customshape-shading-fix (much of it was
> accepted at OOo already, via i#102797)
> 
> Applies patches/dev300/ppt-customshape-shading-fix.diff: fixed prob
> with line arrows - the extra-added single point polygons lead to
> extra arrows randomly around the custom shape. i#105654

The problem isn't in PDF export, so removing filter:pdf keyword. To see it on
screen, one needs to disable OpenGL and AntiAliasing in
Tools->Options->LibreOffice->View. In older versions, one may look for
AntiAliasing in Expert Configuration or in config files.

The code was applied to OOo in i#102797, and was reverted later in i#105654.
However, they still were reproducible in Linux distros before LO, possibly as
part of GoOO (in 3.1 and 3.2 versions of OOo under SUSE and Ubuntu: see
https://bz.apache.org/ooo/show_bug.cgi?id=108658 and
https://bz.apache.org/ooo/show_bug.cgi?id=115511).

The OOo issue didn't contain any clear specifications or test cases, only
patches, neither are there any unit tests on this, so I cannot check if
reverting this part of commit breaks something.

A patch (that reverts these lines) is submitted for review:
https://gerrit.libreoffice.org/35498. Thorsten, I added you as reviewer.

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