Bug report #403
Rendering extremely slow with vector transparency
|Affected QGIS version:||Regression?:||No|
|Operating System:||All||Easy fix?:||No|
|Pull Request or Patch supplied:||Resolution:||worksforme|
|Crashes QGIS or corrupts data:||Copied to github as #:||10462|
Rendering with vector transparency set is intolerably slow if antialiasing is turned off. On a new install, we should set AA on by default.
If someone can confirm this, we should issue a warning when setting transparency if AA is off.
#4 Updated by Markus Neteler over 14 years ago
- Status changed from Closed to Feedback
- Resolution deleted (
I am using Madriva2007 with QT4.2.1 and rendering is indeed extremely slow with vector transparency. Using SVN HEAD.
So I suggest to add a warning about this in case AA is disabled. I take liberty to reopen. In the German translation it is rather impossible to understand what checkboxes should be activated to avoid this slowliness.
#5 Updated by Tim Sutton over 14 years ago
Im testing with qt4.3 and I cant replicate. In many cases turning on anti-aliasing will actually slow down rendering so I think its going to be very confusing to put up a message saying 'turn on AA to speed up rendering with transparnecy, but AA will slow down rendering.'. Im going to forward this bug to 0.8.2, but I wonder if the preblem is resolved with qt4.3 in which case we should consider recommending this version of qt4.3.
#6 Updated by Tim Sutton about 13 years ago
- Status changed from Feedback to Closed
- Resolution set to worksforme
Closed - works for me under Qt 4.3 & Qt4.4. Please reopen if problem persists under a current version of Qt4. Suggestions to improve wording of options for clarity in German would be welcome.