Re: Slow Cocoa
Re: Slow Cocoa
- Subject: Re: Slow Cocoa
- From: Public Look <email@hidden>
- Date: Mon, 16 Feb 2004 15:44:31 -0500
For the record, the archive is corrupted for this thread. I did NOT
write the following article that is attributed to me:
http://cocoa.mamasam.com/COCOADEV/2004/02/2/84595.php
I did write the following text which as far as I can tell has been
swallowed by the archives:
Begin forwarded message:
>
From: Public Look <email@hidden>
>
Date: February 16, 2004 10:47:05 AM EST
>
To: Sam McCandlish <email@hidden>
>
Cc: email@hidden
>
Subject: Re: Slow Cocoa
>
>
Objective-C messaging is unlikely to have any significant impact on
>
drawing speed. The messaging overhead is negligible compared to the
>
processing needed to paint anti-aliased pixels. The only way I would
>
suspect messaging overhead is if you were using multiple messages to
>
paint every pixel.
>
>
Quartz has interesting and non-intuitive performance characteristics.
>
Many paths with few segments can be drawn much faster than few paths
>
with many segments. There is a huge combinatorial overhead associated
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with the join and intersection of segments within a path. When you
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started using NSBezierPath, did you also start creating complex paths
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with many segments ?
>
>
See past threads on this topic in the archives:
>
http://cocoa.mamasam.com/COCOADEV/2002/04/1/30630.php
>
http://cocoa.mamasam.com/COCOADEV/2002/02/1/24334.php
>
>
On Feb 15, 2004, at 10:23 PM, Sam McCandlish wrote:
>
>
> I am making an app that draws using Quartz. I used to use the C
>
> functions, but then I started using NSBezierPath. When I tried that
>
> everything was slower. I am guessing this is because of the
>
> messaging. Is there a way to "speed up" objc? Thanks!
>
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