Opened 17 years ago
Closed 15 years ago
Last modified 14 years ago
#403 closed defect (worksforme)
Rendering extremely slow with vector transparency
|Reported by:||gsherman||Owned by:||wonder|
|Priority:||critical: causes crash or data corruption||Milestone:|
|Must Fix for Release:||Yes||Platform:||All|
|Platform Version:||Awaiting user input:||no|
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.
Change History (8)
comment:1 by , 17 years ago
comment:2 by , 17 years ago
Works fine for me with Qt-4.2.1 under Linux with most polygons. With very complicated polygons or .shp files with large numbers of polygons I do see a small difference, but nothing that is significantly slower.
comment:3 by , 17 years ago
|Status:||new → closed|
Perhaps this is an issue with my (and others) X11 configuration.
I'll close this issue.
comment:4 by , 16 years ago
|Awaiting user input:||unset|
|Status:||closed → reopened|
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.
comment:5 by , 16 years ago
|Milestone:||Version 0.8 → Version 0.8.1|
comment:6 by , 16 years ago
|Milestone:||Version 0.8.1 → Version 0.8.2|
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.
comment:7 by , 15 years ago
|Status:||reopened → closed|
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.
comment:8 by , 14 years ago
Milestone Version 1.0.0 deleted
This does not happen on my system (Kubuntu 6.10, Qt-4.2.1). Performance is ok for me with transparency and with/without AA.