[Issue 124968] .jpg picture with lots of horizontal white lines artifacts if Contour for Wrap enabled

[bugzilla]

https://bz.apache.org/ooo/show_bug.cgi?id=124968

Silviu <sil...@unity3d.com> changed:

           What    |Removed                     |Added
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                 CC|                            |sil...@unity3d.com

--- Comment #3 from Silviu <sil...@unity3d.com> ---
I have managed to reproduce this issue using the following specifications :

Windows 10
Intel(R)Core(TM)2 Duo CPU @ 2.93 GHz
6 GB RAM
GeForce GTX 650 Ti

I was using the latest Open Office build :
AOO420m1(Build:9800)  -  Rev. 1692551
Rev.169255

The bug can be reproduced without the file attached by the user. It doesn't
seem to be related to tables as a simple image
can reproduce this. The repro steps for the bug are :

- create a new document
- import an image and copy and paste it
- in the Wrap apply the same settings for both images
- select Before and Contour and notice that only the first image will get
corrupted.

While investigating this bug i tried various image files like jpeg, png, tiff
and giff. It seems the issue reproduces when the image has a background and
that causes the image to get corrupted. PNG images do not have a background
thus they do not reproduce this bug.

PNG - not reproducible
TIFF - not reproducible
GIF - not reproducible

GIF doesn't seem to be supported in the Writer and displays a static image.
Changing the wrap does not reproduce the bug
altough the static image has a background. It displays the picture correctly.

While testing i have also noticed that the issue only happens on the first
picture introduced in the document. Using a second 
image with the same settings will not get corrupted.

Steps to reproduce :

- import an image and copy and paste it
- in the Wrap apply the same settings for both images
- select Before and Contour and notice that only the first image will get
corrupted.

More images can get corrupted if they are selected and the settings are changed
for all images :

- select all images 
- change them all to Before and Contour

Please see the screenshots attached.

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