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List:       koffice
Subject:    Re: Formatting large docs in Kword
From:       Clarence Dang <dang () kde ! org>
Date:       2002-12-13 5:40:19
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On Wed, 11 Dec 2002 12:59 am, Nicolas Goutte wrote:
> On Tuesday 10 December 2002 07:25, Clarence Dang wrote:
> > I can see Nicolas smiling here because I once told him that these modes
> > where "exotic" and "useless" :-)  But now it seems like I'm wrong!
>
> They might be exotic but when you have a text formated in this way they are
> very useful. :-)
>
Yes I know, you win :)

> > > BTW Kword now loads and edits these big docs pretty quickly.
> >
> > Really?  The filter reads one character at a time, last time I checked...
>
> The filter is fast. 
I agree that in the grand scheme of things it is pretty fast (practically and 
in terms of time complexity).

But since I am an optimisation person (still programming 286s :)), I should 
point out that calling QTextStream::operator>> (QChar) in 
ASCIIImport::readLine 20 million times (for bug #45973, at least) is rather 
expensive.
QT did not inline the function and there is way too much logic to read in a 
single character in the qt libs especially for those 20MB DNA sequences that 
we open every day :)

QStreamText::readLine does support Mac newlines (now) and would be much 
faster....

But then, I'm not complaining :) so actually, don't change it to 
QStreamText::readLine yet because I actually have a use for 
ASCIIImport::readLine (since I'm going to be hacking that filter in a week or 
two)....

I wonder if something like "partial importing" (only load part of the 
document, what vi and msword appear to do) could be implemented in the 
KOffice filter system....

> It is loading in KWord that is not, especially the
> needed paginating after load. The pagination may need even more time than
> the load itself. (That is why I have made KDE Bug #50467
> http://bugs.kde.org/show_bug.cgi?id=50467 )
>
Yes KWord seems to be the bottleneck with mswritefilter too but maybe it's the 
amount of XML that gets passed to it...

Clarence

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