Compiz ‘Thumbnail Window Previews’ artefacts (further fix +)

Bug #1606369 reported by David Black on 2016-07-25
14
This bug affects 3 people
Affects Status Importance Assigned to Milestone
ubuntu-mate
Low
Unassigned
compiz (Ubuntu)
Low
Martin Wimpress
Nominated for Xenial by Martin Wimpress
Nominated for Yakkety by Martin Wimpress

Bug Description

With current settings, Galculator creates an unsightly additive thumbnail artefact which remains after thumbnail preview closes (screen capture link).
http://www.pasteall.org/pic/show.php?id=102129

# Fix
org.compiz.profiles.mate.plugins.decor

- active-shadow-x-offset 6
+ active-shadow-x-offset 2

- active-shadow-y-offset 6
+ active-shadow-y-offset 2

- inactive-shadow-x-offset 6
+ inactive-shadow-x-offset 2

- inactive-shadow-y-offset 6
+ inactive-shadow-y-offset 2

# This fix also benefits all Compiz windows, as shadows become more proportionally balanced.

___

# Recommendation
With current settings, thumbnails occupy almost half the screen vertically on a Netbook (1024x600 resolution).

# Fix
org.compiz.profiles.mate.plugins.thumbnail

- thumb-size 280
+ thumb-size 256

___

Edit: Simplified bug report/fix, tried to improved readability. Thanks

David Black (db4tech) on 2016-07-25
description: updated
description: updated
description: updated
Changed in compiz (Ubuntu):
milestone: none → xenial-updates
importance: Undecided → Low
assignee: nobody → Martin Wimpress (flexiondotorg)
status: New → Triaged
Changed in ubuntu-mate:
status: New → Triaged
importance: Undecided → Low
Changed in compiz (Ubuntu):
milestone: xenial-updates → none
David Black (db4tech) on 2016-10-14
description: updated
David Black (db4tech) on 2016-10-14
description: updated
Csaba Nemethi (csaba-nemethi) wrote :

The solution proposed by David Black won't eliminate all artefacts related to the thumbnail window previews. To see this, apply the proposed solution and then just type "wish" in a MATE-Terminal. The resulting window has a geometry of 200x200, and the corresponding thumbnail still gives rise to the reported artefact. Same problem with any other top-level window having a sufficiently small size.

Alternative solution: Change org.compiz.profiles.mate.plugins.thumbnail.border from the value 12 to 19 (or higher).

With this patch, I could no longer reproduce that annoying thumbnail artefact, regardless of whether the change proposed by David Black was in effect or not.

BTW: IMHO, the shadow effect generated by the original offset value of 6 (for active-shadow-x-offset, active-shadow-y-offset, inactive-shadow-x-offset and inactive-shadow-y-offset) looks better than the one corresponding to the proposed offset value of 2). Of course, this is just matter of taste.

Csaba Nemethi (csaba-nemethi) wrote :

After some more testing I came to the conclusion that proportionally balanced shadows (as proposed by David Black) will result in improved appearance when using a light theme (and will be OK for dark themes, too). Also, with that fix in effect, it is sufficient to change the value of org.compiz.profiles.mate.plugins.thumbnail.border from 12 to 15 (instead of 19) in order to completely eliminate the reported artefact. Consequently:

Alternative solution revisited: Apply the fix proposed by David Black AND change the value of org.compiz.profiles.mate.plugins.thumbnail.border from 12 to 15.

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