From kde-kimageshop  Wed Jun 06 09:11:40 2007
From: Boudewijn Rempt <boud () valdyas ! org>
Date: Wed, 06 Jun 2007 09:11:40 +0000
To: kde-kimageshop
Subject: Re: QRegion
Message-Id: <200706061111.42545.boud () valdyas ! org>
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On Wednesday 06 June 2007, Boudewijn Rempt wrote:
> On Monday 04 June 2007, Boudewijn Rempt wrote:
> > It uses internally some X11 stuff that's meant for optimizing screen
> > updates. Yes, having a class that collects rects, computes the smallest
> > set of the biggests possible rects is an interesting problem.
>
> I did think a bit on a KisRegion class and I fairly sure that I cannot ma=
ke
> it work.

Apparently it's really a hard problem: Pippin doesn't have a solution eithe=
r.=20
I asked Zack Rusin, and he suggested to use QPainterPath and the Qt4=20
tesselator. In Qt 4.4, we'll be able to add and subtract rects from a=20
QPainterPath -- and we'll have access to the tesselator. That should make i=
t=20
possible to replace QRegion. Whether it'll be faster I don't know, but give=
n=20
that it's Zack working on the thing I guess it will.

Of course, we could already try to use QPainterPath together with=20
toFillPolygons and then QPolygonF::boundingRect() -- but that doesn't help=
=20
with the layer dirty region marking.

=2D-=20
Boudewijn Rempt=20
http://www.valdyas.org/fading/index.cgi

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