>> 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_______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
