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?
The sequence I'm using (hope I haven't missed anything out) is: NSImage *theImage = [[NSImage alloc] initWithContentsOfFile:fileName]; ... NSObject *imageRepresentation = [[image representations] objectAtIndex:imgRepresentationIndex]; bmp = (NSBitmapImageRep*)imageRepresentation; ... const unsigned char *srcData = [bmp bitmapData]; The file is in fact a TIFF file, so it does contain raster data. Am I going about this the wrong way as a means of getting at the raw pixels stored in a file? Thanks for any suggestions. 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
