Bug 95709 - [DISPLAY] Presentation mode renders graphics wrong
Summary: [DISPLAY] Presentation mode renders graphics wrong
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) Master
Hardware: All All
: highest normal
Assignee: Armin Le Grand
Whiteboard: target:5.2.0 target:5.1.2 target:5.0.6
Keywords: bibisected, regression
Depends on:
Reported: 2015-11-09 18:10 UTC by Olivier Hallot
Modified: 2016-10-25 19:09 UTC (History)
7 users (show)

See Also:
Crash report or crash signature:

Image shows the issue (79.06 KB, image/png)
2015-11-09 18:10 UTC, Olivier Hallot
File with issue in (66.88 KB, application/vnd.oasis.opendocument.presentation)
2015-11-09 18:11 UTC, Olivier Hallot
Stripped, adapted SVG (2.15 KB, image/svg+xml)
2016-02-26 14:28 UTC, Armin Le Grand

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Description Olivier Hallot 2015-11-09 18:10:30 UTC
Created attachment 120424 [details]
Image shows the issue

The image shows the background of the slide not scaled to full screen.

A white strip in the right and bottom confirm.

ID de compilação: e5f16313668ac592c1bfb310f4390624e3dbfb75
Local: pt-BR (pt_BR.UTF-8)
Comment 1 Olivier Hallot 2015-11-09 18:11:55 UTC
Created attachment 120425 [details]
File with issue in
Comment 2 tommy27 2015-11-09 20:14:02 UTC
renders fine under Win8.1 x64 using LibO and recent daily build

would you please tell your exact Linux distro and version, your graphic card and the screen resolution of your monitor(s)?
Comment 3 tommy27 2015-11-09 20:14:46 UTC
did you tested with older LibO releases to see if the bug is a regression or an old one?
Comment 4 Olivier Hallot 2015-11-09 20:40:57 UTC
Kubuntu 15.10

olivier@olivier-ntbk:~$ uname -a
Linux olivier-ntbk 4.2.0-17-generic #21-Ubuntu SMP Fri Oct 23 19:56:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Laptop Dell Vostro 3560 (i7, 8GB, Intel graphics and AMD graphics)

Main display is Intel.

lspci -k:

00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
        Subsystem: Dell Device 056e
        Kernel driver in use: i915

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7500M/7600M Series] (rev ff)
        Kernel driver in use: radeon

Screen is 1920 x 1080 laptop.
Comment 5 Buovjaga 2015-11-12 11:31:31 UTC
Repro, but not with 3.5.0. Not related to OpenGL setting.

Win 7 Pro 64-bit, Version: (x64)
Build ID: e5f16313668ac592c1bfb310f4390624e3dbfb75
Locale: fi-FI (fi_FI)

Build ID: b216cc1b8096eb60c27f67e8c27b7cd756c75e38
TinderBox: Win-x86@62-merge-TDF, Branch:MASTER, Time: 2015-11-12_00:06:20
Locale: fi-FI (fi_FI)

Comment 6 raal 2015-11-13 07:57:51 UTC
Reproducible with Version:
Build ID: 57d6b92b69a31260dea0d84fcd1fc5866ada7adb, win7
Comment 7 tommy27 2015-11-13 08:31:50 UTC
render fine in Win7x64 SP1 using LibO
I wonder why I don't reproduce it...
Comment 8 Robinson Tryon (qubit) 2015-12-14 05:32:37 UTC Comment hidden (obsolete)
Comment 9 Joel Madero 2015-12-14 17:36:01 UTC
Normal - can prevent high quality/professional work;
Highest - I think this qualifies, native format, regression, major feature (backgrounds in a presentation), etc...

Two bibisects - at one point things works correctly -> then there was no background at all -> then it got to the current state.

The bibisects:
Bibisect #1: Moving from no background -> current state
Bibisect #2: Moving from right -> no background

98011212e3ccd9334f4112d8312cfd2087624283 is the first bad commit
commit 98011212e3ccd9334f4112d8312cfd2087624283
Author: Matthew Francis <mjay.francis@gmail.com>
Date:   Sat Mar 14 23:46:43 2015 +0800

    commit 2ddfaf1f03135c10d33e0e99ebe8a56d3783d214
    Author:     Armin Le Grand <alg@apache.org>
    AuthorDate: Wed Jul 23 16:35:32 2014 +0000
    Commit:     Caolán McNamara <caolanm@redhat.com>
    CommitDate: Thu Jul 24 13:08:15 2014 +0100
        Resolves: fdo#81598 #i125300# enhanced handling of multiple ClipRegions...
        in MetafileProcessor
        (cherry picked from commit 02e2c7b225036c6478a1f7e8315a9c8361025a7f)
        Change-Id: Iefefc36c040507795bc2c25fe8d4a610eb12adb9

:040000 040000 2e78de6d68baaac9f88c621ef42a3b303b2b79d1 fdc88fc5ca2ab00d8027242975cdbe5444aee311 M	opt

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git bisect start 'latest' 'oldest'
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# bad: [98011212e3ccd9334f4112d8312cfd2087624283] source-hash-2ddfaf1f03135c10d33e0e99ebe8a56d3783d214
git bisect bad 98011212e3ccd9334f4112d8312cfd2087624283
# good: [883604282766e705001a45bea49ecbcf8771b012] source-hash-ba4b92389bd7df92e1eddf025ad03ee6355cabfa
git bisect good 883604282766e705001a45bea49ecbcf8771b012
# first bad commit: [98011212e3ccd9334f4112d8312cfd2087624283] source-hash-2ddfaf1f03135c10d33e0e99ebe8a56d3783d214

ba6eb41acb8df58f3009920f8ab8b32a3e1b764e is the first bad commit
commit ba6eb41acb8df58f3009920f8ab8b32a3e1b764e
Author: Bjoern Michaelsen <bjoern.michaelsen@canonical.com>
Date:   Tue Dec 11 01:59:31 2012 +0000

    commit ae4e4a11d4300f7448cb6bd170fcb034542caddc
    Author:     Rene Engelhard <rene@debian.org>
    AuthorDate: Tue Nov 6 21:24:32 2012 +0100
    Commit:     Rene Engelhard <rene@debian.org>
    CommitDate: Tue Nov 6 21:24:32 2012 +0100
        Change-Id: I2c7968194afbcf74967cd16c639dce7de858a513

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:100644 100644 bcee1e11bd693642ca5a6330175b58082e5dcdd0 54d2377f5b3afd6ed668b3e24cb877c289119ec5 M	ccache.log
:100644 100644 75677cef16786d2cc95c0d8f301482278ca055c3 d18a6ebcd3b8537c3dd3dbc16e862fb6370ecb8a M	commitmsg
:100644 100644 83b4ecc0ecb3e031c804d49f45f854e95d5cc961 d482c00e5fff6081c6b87b637fd9ffaf3e1e2c6c M	dev-install.log
:100644 100644 91437b9974ffada7e049273419bb8c66c91c0539 abf45ab9609c77a5ab952aa310eafe8c2ffaf85c M	make.log
:040000 040000 45c0bab8b669778ab523c8f65a25e8c9afde604a f4bfa15b2f72d3df5675b07bcf32254a819b9d19 M	opt

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Comment 10 Armin Le Grand 2016-02-25 17:02:51 UTC
Seems to have to do with the MasterPageBackgroundImage being a SVG. Using the same as PNG works well. SVGs may be embedded to ClipRegions when content overlaps SVG range definition (see svgio, SvgSvgNode::decomposeSvgNode), but that is used for some time.
Comment 11 Armin Le Grand 2016-02-25 17:27:22 UTC
Checked, not the reason. When pres starts, three MaskPrimitive2D are processed in VclMetafileProcessor2D. When suppressing the 1st one, all is looking good. Need to dig deeper.
Since internals there are like they are for some time I'm wondering if or to what this is a regression. Same happens e.g. with Version:, Version:, Version: It does not happen in Version:, Version, and Version Thus, must have been added between and
Comment 12 Armin Le Grand 2016-02-25 17:47:54 UTC
There are two Regions created using B2DPolyPolygons which lead to problems, one created at svgio import, one when PolyPolygonGraphicPrimitive2D gets decomposed. Both are used for long time and for display, so there must be an error somewhere on the transfer of these regions to the slideshow.
Tried to break at WriteRegion/ReadRegion which I thought might be used when the Metafile is handed over to the slideshow, but it is not...
Comment 13 Armin Le Grand 2016-02-25 18:10:04 UTC
Checked all primitive creators, pref sizes and embeddings, looks good. Metafile is tunneled to presentation, thus the B2DPolyPolygon will survive. Need to check directly what slideshow does with MetaActionType::CLIPREGION...
Comment 14 Armin Le Grand 2016-02-26 09:13:31 UTC
Leaving all clippings out in cppcanvas ImplRenderer::createActions does not help and shows that all SVG data reation is indeed correct - what is lost is when cppcanvas tries to render that SVG itself as graphic.
Can be proved by not using the same image as background, but as regular graphic -> effect in the slideshow is the same, internal parts of the SVG graphic are painted wrong (the background, while other parts are correct).

Thus: The error is that the canvas renderer is not capable to render this SVG correctly. I am not a canvas-renderer specialist.
Comment 15 Armin Le Grand 2016-02-26 09:31:12 UTC
The SVG gets embedded with it's primitives just in a transformation expressing it's geometric positioning (as it should be). Thus the wrong-painted part of it should reside in the same metafile (the primitives get processed using the MetafileRenderer, slideshow does not use primitives (yet)). Trying to extract/strip the example
Comment 16 Armin Le Grand 2016-02-26 10:45:21 UTC
Poblem is cppcanvas\source\mtfrenderer\transparencygroupaction.cxx line 371. Some hard to understand corrections on canvas transformation state. If not executing this, all works correctly.
We have to ask Thorsten, it's old stuff mixed with some new one (last is commit af1514abf26b2070bd342ce449f209a42f3989e5).
Comment 17 Armin Le Grand 2016-02-26 13:57:16 UTC
Did some tests. There are two possibilities which make TransparencyGroupAction::renderSubset work:
(1) Leave out aScaleCorrection
(2) Add 'aLocalState.Clip.clear();' after setRenderStateTransform
Comment 18 Armin Le Grand 2016-02-26 14:27:46 UTC
Checked deeper, (1) only seems to work since it is a gradient. Using a test file which clearly shows the borders (attaching stripped, modified one) makes this a no-op.
What happens is that the scale needs to be taken out, but the local clip is then wrong (if used). Thus, (2) splits in (a) clearing clip or (b) adapting clip to the scale-adaption, too. That would involve convert clip from XPolyPolygon2D to B2DPolyPolygon, transform, convert back and set.
It depends if this is ever used - (a) is fast, (b) is correct.

Did I mention that all this would be obsolete when presentation would use primitives...?
Comment 19 Armin Le Grand 2016-02-26 14:28:23 UTC
Created attachment 123012 [details]
Stripped, adapted SVG
Comment 20 Armin Le Grand 2016-02-26 15:32:17 UTC
Implemented clip adaption, works well. Preparing solution...
Comment 21 Commit Notification 2016-02-28 10:12:42 UTC
Armin Le Grand committed a patch related to this issue.
It has been pushed to "master":


tdf#95709 adapt clip polygon for transparence groups

It will be available in 5.2.0.

The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:

Affected users are encouraged to test the fix and report feedback.
Comment 22 Commit Notification 2016-03-04 14:47:46 UTC
Armin Le Grand committed a patch related to this issue.
It has been pushed to "libreoffice-5-1":


tdf#95709 adapt clip polygon for transparence groups

It will be available in 5.1.2.

The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:

Affected users are encouraged to test the fix and report feedback.
Comment 23 Commit Notification 2016-03-04 14:47:52 UTC
Armin Le Grand committed a patch related to this issue.
It has been pushed to "libreoffice-5-0":


tdf#95709 adapt clip polygon for transparence groups

It will be available in 5.0.6.

The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:

Affected users are encouraged to test the fix and report feedback.