Bug report #2483: Window resize/zoom problem with large rasters - QGIS Application - QGIS Issue Tracking

Bug report #2483

Window resize/zoom problem with large rasters

Added by John Tull over 14 years ago. Updated almost 12 years ago.

Status:	Closed
Priority:	Low
Assignee:	-
Category:	GUI
Affected QGIS version:	master	Regression?:	No
Operating System:	OS X	Easy fix?:	No
Pull Request or Patch supplied:	No	Resolution:	worksforme
Crashes QGIS or corrupts data:	No	Copied to github as #:	12543

Description

With current trunk and qt-4.6.2 on OS X, the qgis application window behaves strangely when trying to resize it. To reproduce the problem:

1) load a large raster image to the canvas (mine is a 600mb hillshade)

2) grab the window resize widget in the bottom right and drag to a new size

3) wait patiently for the resize and redraw (note it does not redraw to where you dragged your mouse)

4) click the pan tool or top bar of the application window

The result is the window resizing to a very small size after the interface click event. I am guessing this is memory-related, somehow, but just making a guess. I do not know if it is a qt or a qgis bug. FWIW, I do not have render caching enabled.

History

#1 Updated by John Tull over 14 years ago

Disabling rendering is a means to circumvent the issue. Perhaps it would be possible to disable rendering of the map canvas on resize events as a workaround?

#2 Updated by John Tull over 13 years ago

The default behavior is to disable the render improvement option in QGIS. It is unclear if this bug is a result of qt problems or something in the QGIS code. A real solution would be great, especially as further render enhancements are developed for QGIS.