[Ipe-discuss] Antialiasing, delete

Dmitriy Morozov defaultmail at foxcub.org
Mon Dec 12 19:58:03 CET 2005

> Dmitriy Morozov wrote:
>> I have removed this line because the lines were flickering noticeably
>> with it (not dramatically, but noticeably) when antialiasing was on.
>> In light of what you say about Ipe's implicit off-screen drawing,
>> I'm not sure why this happens. I use only Linux, and it has not
>> become slow (i.e., I saw no change in speed). However, it would be
>> interesting to have other users check its performance too.
> Most mysterious.  On my computer (a standard Fedora Core 3
> installation), Ipe became unusably slow (it would take 5 seconds for the
> display to follow the cursor movement).  Perhaps I should take out Ipe's
> own rendering to bitmap and see what happens.  I'd encourage all Linux
> user's to comment out the following line in
> "src/ipecanvas/ipecanvas.cpp" and report whether Ipe slows down
> dramatically or whether it improves rendering without any problem:
>    setAttribute(Qt::WA_PaintOnScreen);

The systems I've tried this one are Gentoo Linux, and CentOS (some Red Hat
derivative that our department runs). That's just for the record.

>>>Yes, it's a bug (and has already been filed).
>> Well, by me, so it wasn't already when I asked. ;-)
> That's not what I meant.  You filed bug #130, but the same problem had
> already been reported as bug #122 and bug #128.

Ah, I misunderstood. It would be nice if Ipe Bugzilla had the same feature
as KDE Bugzilla where it performed a search on the summary first to give a
list of potentially related bugs, before letting you fill out the
description of a bug. It would help in situations like this one.


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