Bug report #16988

Updated canvas setting for min/max values of raster layer with pseudocolor style causes continuous updates

Added by Johannes Kroeger over 6 years ago. Updated over 6 years ago.

Affected QGIS version:master Regression?:Yes
Operating System: Easy fix?:No
Pull Request or Patch supplied:No Resolution:
Crashes QGIS or corrupts data:No Copied to github as #:24887


Load a (singleband?) raster layer.
Set a Singleband pseudocolor.
Select "Updated canvas" for the "Statistics extent".
QGIS will now continuously update those values, flickering between different ones, without the user moving the map extents/canvas at all.
QGIS should only update when the map extents/canvas actually changes.

Master from ~20 hours ago.

I noticed that even with just one layer loaded and not using pseudocolor but "Singleband gray", the min/max values update two times on each canvas move. Maybe that is related?

Associated revisions

Revision a4067399
Added by Nyall Dawson over 6 years ago

Add render context flag to indicate canvas preview jobs

In future we can use this to optimise the preview job and shortcut
by doing lower quality/faster renders.

For now, use this flag to identify preview jobs and only apply
'updated canvas' min/max to rasters for non-preview jobs

Fixes #16988


#1 Updated by Giovanni Manghi over 6 years ago

  • Regression? changed from No to Yes
  • Priority changed from Normal to High

#2 Updated by Nyall Dawson over 6 years ago

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

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