On Tue, Oct 26, 2010 at 4:14 AM, Gregory Weston <gwes...@mac.com> wrote: > Iceberg-Dev wrote: > >>> When working with NSBitmapImageRep, calling -bitmapData is a signal >>> that you may be editing the data. It is not repackaged until the >>> bitmap is drawn, or somesuch. It's illegal to just stash a pointer >>> to the data and use it arbitrarily later - that won't necessarily >>> be the same data as now backs the image. This is described in the >>> 10.6 AppKit release notes. >> >> Calling -bitmapData works on Mac OS X 10.5, it does not work on Mac >> OS X 10.6. On 10.6, it's slow and the data gets zeroed. Bug? > > It would seem, but where is uncertain. I just threw something together to > access every byte of a 3MPixel image sequentially. It consistently took just > over 0.02s and did not result in data loss.
Well, on my MacBook Pro: - it's slow - it zeroes the data and it crashes: 0 libSystem.B.dylib 0x00007fffffe006c5 __bzero + 197 1 com.apple.Foundation 0x00007fff87909245 -[NSConcreteMutableData setLength:] + 214 2 com.apple.Foundation 0x00007fff87909155 -[NSConcreteMutableData initWithLength:] + 404 3 com.apple.AppKit 0x00007fff86c03eae NSNewBitmapBackingStore + 220 4 com.apple.AppKit 0x00007fff86c3e4e2 -[NSBitmapImageRep _fromCGImage:performBlockUsingMutableData:] + 191 5 com.apple.AppKit 0x00007fff86c03d85 __-[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:]_block_invoke_1 + 341 6 com.apple.AppKit 0x00007fff86b2f9a2 -[NSBitmapImageRep _performBlockUsingBacking:] + 45 7 com.apple.AppKit 0x00007fff86c03c2c -[NSBitmapImageRep _withoutChangingBackingPerformBlockUsingBackingMutableData:] + 79 8 com.apple.AppKit 0x00007fff86c03bc2 __-[NSBitmapImageRep _performBlockUsingBackingMutableData:]_block_invoke_1 + 125 9 com.apple.AppKit 0x00007fff86b2f9a2 -[NSBitmapImageRep _performBlockUsingBacking:] + 45 10 com.apple.AppKit 0x00007fff86c03b41 -[NSBitmapImageRep _performBlockUsingBackingMutableData:] + 79 11 com.apple.AppKit 0x00007fff86c03aef -[NSBitmapImageRep getBitmapDataPlanes:] + 79 Without calling - bitmapData, it's reasonably fast and does not crash. Can you post your sample code? _______________________________________________ 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
