Re: [NSBitmapImageRep getBitmapDataPlanes] copying data?
Re: [NSBitmapImageRep getBitmapDataPlanes] copying data?
- Subject: Re: [NSBitmapImageRep getBitmapDataPlanes] copying data?
- From: Jonny Taylor <email@hidden>
- Date: Mon, 21 Feb 2011 21:19:47 +0000
>> I am looking at the performance of my code, and have found that rather a lot of time is spent in [NSBitmapImageRep getBitmapDataPlanes]. This is rather disappointing because I had assumed this was a 'trivial' way of getting a pointer to the actual data store itself in the case of raster data. Investigation using shark appears to confirm that the call is making a copy of the data(?). Can anyone shed any light on what is going on and whether I can do anything about it?
>
> Assuming you're running on Snow Leopard, the relevant information is in this document:
>
> http://developer.apple.com/library/mac/#releasenotes/Cocoa/AppKit.html
Thanks very much for your reply, that's very helpful. So do I understand it correctly that there is no way at all of peeking (read only) at the pixels of a NSBitmapImageRep without triggering a copy? That's a bit of a shame if so - guess I'll have to look into CoreImage.
Cheers
Jonny_______________________________________________
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