Il 28/11/2011 19:49, Radim Blazek ha scritto:
Preparing projects for qgis_bench application, I noticed that qgis
renders the same project much slower than qgis_bench. I found that
QgsMapCanvasMap was using by default QPixmap, not QImage, which is 7
times slower! To be precise, QGIS was using QPixmap by default, but in
options GUI was set as default QImage. If "Fix problems with
incorrectly filled polygons" is unchecked (default), QImage is used.
It means that it was sufficient to open options dialog, apply (not
changing anything) and QgsMapCanvasMap started to use QImage.
Obviously, this could not be noticed by developers and advanced users,
because they had used options dialog at least once. Naive users (like
me), who rely on default settings, were using QPixmap. It seems, that
since 2006, all the first-time users (and thus maybe also last-time
users) were experiencing this problem. Is it possible or am I wrong?
Hopefully. Having fixed this problem (fixed in master [2]), the true
optimization may start.
Thanks a lot Radim.
I tried checking and unchecking the option, but the results were not
noticeable at the desktop level: did I miss something?
All the best.
--
Paolo Cavallini
See: http://www.faunalia.it/pc
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