[Merkaartor] [Merkaartor - Bug #3206] (New) Performance issue

[Chris Browet]

Nevermind... Seems I f... up in my tests. Only Qt 4.7 seem to solve the Qt
problem...

On Mon, Dec 20, 2010 at 11:47, Chris Browet <cbro at semperpax.com> wrote:

> Hi,
>
> Long story:
> From the early days of Merkaartor, Qt had a problem when we were drawing
> long roads at high zoom levels. Somehow, the drawing was not properly
> clipped and an insane large bitmap was created by Qt to draw the road and
> then only clipped to be drawn on screen. So we resolved to implement our own
> clipping.
>
> Recently I noticed (at least on my test systems) that it was no longer
> necessary and removing self-clipping would allow to remove the dependency on
> Boost and specifically Boost::Geometry
> Not knowing precisely when that was solved on the Qt side, I disabled
> self-clipping for Qt >= 4.6.0.
>
> My Test systems (which do no not have the problem) are:
> Win 7 / Qt 4.6.3 / ATI
> Ubunutu 10.04 / Qt 4.6.2 / Virtualbox
> Ubuntu 64 10.10 / Qt 4.7.0 / Virtualbox
>
> Could those affected by the problem add to
> http://merkaartor.be/issues/3206:
> - Their OS version
> - Their Qt version
> - Their graphic card brand
>
> The goal is to find a proper pattern (if any). If none can be identified,
> I'll think about some other way...
>
> Thanks in advance
> - Chris -
>
>
>
> On Mon, Dec 20, 2010 at 08:10, <noreply at merkaartor.be> wrote:
>
>>  Issue #3206 has been reported by Jean-Claude Repetto.
>> ------------------------------
>> Bug #3206: Performance issue <http://merkaartor.be/issues/3206>
>>
>>    - Author: Jean-Claude Repetto
>>    - Status: New
>>    - Priority: High
>>    - Assigned to:
>>    - Category:
>>    - Target version:
>>    - Resolution:
>>
>> The current (17 december 2010) trunk version is very slow (about 40 times
>> slower than a mid-october version). For example, dragging a node takes from
>> 8 to 10 seconds, while with an older version it took a fraction of second.
>> I used "git bisect" to check the exact version where the problem appeared
>> :
>>
>> aef25d136e1b7cb2858027356b32a71ea821d97b is the first bad commit
>> commit aef25d136e1b7cb2858027356b32a71ea821d97b
>> Author: Chris "Koying" Browet <cbro at semperpax.com>
>> Date: Mon Nov 1 03:31:55 2010 +0100
>>
>> Spatialite cont'd
>>     Do not self-clip QpainterPath anymore
>>
>> ------------------------------
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>
>
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