Re: Slow Cocoa
Re: Slow Cocoa
- Subject: Re: Slow Cocoa
- From: Public Look <email@hidden>
- Date: Mon, 16 Feb 2004 10:47:05 -0500
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
with the join and intersection of segments within a path. When you
started using NSBezierPath, did you also start creating complex paths
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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| References: | |
| | >Slow Cocoa (From: Sam McCandlish <email@hidden>) |