https://bugs.kde.org/show_bug.cgi?id=424233
Ahab Greybeard <ahab.greybe...@hotmail.co.uk> changed:
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--- Comment #1 from Ahab Greybeard <ahab.greybe...@hotmail.co.uk> ---
Created attachment 130166
--> https://bugs.kde.org/attachment.cgi?id=130166&action=edit
Illustration of Wrap artifacts after Moves
I can confirm that this happens for all appimages from verison 4.2.0 to a
recent 5.0.0 prealpha.
I attach a .zipped collection of screenshots to illustrate some points.
As has been noted, it can happen when performing large distance moves while the
view is in Wrap Around Mode.
This happens rarely and you do need to do lots of fast large distance moves.
These moves take time to perform (depending on PC-graphics speed/power).
-----------------------------------
However, a very quick way to see it happen is to have off-canvas content in an
original image.
1-red-tiled.png shows a Wrapped view of a simple painted image that has a small
amount of off-canvas content, caused by 'accidentally' painting too close to
the edge of the canvas. This is not visible as would be expected.
After a very small move then the screen shows 2-red-tiled-after-move.png.
-----------------------------------
For the cases where there is no off-canvas content originally, I think that
off-canvas content is introduced in a way that creates artifacts after rapid
long distance moves:
3-rose-artifacts.png shows the end-result of this with Wrap mode turned off
after the artifacts appear.
4-rose-off-canvas.png shows the result after doing Image -> Trim to Current
Layer to reveal the off-canvas content.
-----------------------------------
With Wrap mode on, you can paint 'attractive' well tiled images as shown in
5-blue-nice-pattern.
Such an image does not have off-canvas content.
A small move perfomed with Wrap on will introduce off-canvas content but this
does not affect the Wrapped image or Wrapped moves.
Longer distance moves introduce more off-canvas content of a fragmented nature
which still doesn't affect the Wrapped view.
Eventually, if you do repeated rapid large distance moves with Wrap on, you can
get artifacts as seen in 6-blue-pattern-moved-lots.png
7-blue-off-canvas.png shows the off-canvas content at that stage.
-----------------------------------
One possible solution may be to perform a Trim to Image Size before
implementing wrap mode and after moves during wrap mode.
Ideally, the introduced off-canvas content not be created in the first place.
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