Bug report #17379

WMS layers not rendered in Composer - 2.18.14-16

Added by Pedro Venâncio about 5 years ago. Updated almost 5 years ago.

Assignee:Matthias Kuhn
Category:Map Composer/Printing
Affected QGIS version:2.18.14 Regression?:Yes
Operating System:Windows Easy fix?:No
Pull Request or Patch supplied:No Resolution:fixed/implemented
Crashes QGIS or corrupts data:No Copied to github as #:25276


WMS layers are not rendered in Print Composer in QGIS 2.18.14-2 (code revision 9d4ab51ee1) - OSGeo4W 64bits.

To replicate:

1) Load a WMS layer in QGIS;
2) New Print Composer;
3) Add New Map.

Nothing appears in the map composer.

This only happens on QGIS 2.18.14-2. On 2.18.14-1 (code revision ff83b9a479), everything works ok.

This seems related with October 31 commits from Matthias, that try to fix this segmentation fault bug: #16803

PS: the affected version field is not correct. I've chosen 2.18.13 because 2.18.14 is not an option yet.

Associated revisions

Revision abb7d2a1
Added by Matthias Kuhn almost 5 years ago

Revert force WMS rendering in non-gui thread

Fix #17379


#1 Updated by Nyall Dawson about 5 years ago

Matthias - based on this i think we should back out fde62409, and then kill that option to create raster preview images from the options dialog and all code. It's just not worth the hassle.

#2 Updated by Jürgen Fischer about 5 years ago

  • Description updated (diff)

#3 Updated by Luigi Pirelli about 5 years ago

yes, it could be safe,the patch b3ea17f3e2e8d430775d545bc624650ef3654766 would avoid to enter in draw call creating legend
related with this PR https://github.com/qgis/QGIS/pull/5302

#4 Updated by Matthias Kuhn about 5 years ago

How does it not crash with the print composer but does crash with the preview image?

Isn't the print composer potentially also in a dangerous situation to die if the user interacts during export or other unexpected things happen in processEvents?

I'm ok with this fix for 2.18 because it seems it's the quickest way we can get to a relatively safe situation. For 3.0 we need to find a better solution, QEventLoop and processEvents calls on the main thread are evil.

I'll try to come up with something.

#5 Updated by Pedro Venâncio about 5 years ago

Hi Matthias,

This is happening again in QGIS code revision 193ead7398.

#6 Updated by Giovanni Manghi about 5 years ago

  • Status changed from Open to Feedback

So now this affects only master? or again also 2.18.*?

#7 Updated by Pedro Venâncio about 5 years ago

Hi Giovanni,

It does not affects master, neither 2.14.20. It only affects 2.18.x (>= 2.18.14-2).

Somehow I thought this change was reverted when I opened this ticket, but now I see that this is broken since then. The machine where I've tested this morning wasn't updated since 2.18.14-1 (code revision ff83b9a479), was only updated today.

So, this seems a serious problem, that should be avoided in the next point release 2.18.15 (2017-12-08).

#8 Updated by Giovanni Manghi about 5 years ago

  • Affected QGIS version changed from 2.18.13 to 2.18.14
  • Subject changed from WMS layers not rendered in Composer - 2.18.14-2 code revision 9d4ab51ee1 to WMS layers not rendered in Composer - 2.18.14-16
  • Status changed from Feedback to Open

So, 2.18.14-16 is affected, 2.18.14-1 is not. Must be fixed otherwise is will affect the next standalone installers too.

#10 Updated by Anonymous almost 5 years ago

  • Status changed from Open to Closed
  • % Done changed from 0 to 100

#11 Updated by Giovanni Manghi almost 5 years ago

  • Resolution set to fixed/implemented

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