On Sun, Feb 8, 2009 at 9:39 PM, Michael Ash <michael....@gmail.com> wrote:
> On 2/8/09, Stephen J. Butler <stephen.but...@gmail.com> wrote: > > One thing to watch out for -- and it's generated some traffic on this > > list recently -- is that NSImage creates hidden windows to manage > > resources. So if you're loading many, many, many images, NSImage can > > lockup the Window Server. > > This really needs a qualifier: NSImage *can* create hidden windows to > manage resources. To be more specific, NSImage can create an > NSCachedImageRep, which in turn creates NSWindows. The specific > circumstances in which this happens are when you draw into an NSImage > using lockFocus and the like, and at least sometimes when you draw > with the image. Simply creating an NSImage from a file and then > extracting one of its representations shouldn't create an > NSCachedImageRep. Drawing an NSImage that is backed by NSBitmapImageRep(s) will also never end up creating windows on 10.5, and probably earlier. -[NSImage lockFocus] is the main thing that will get the windowserver involved. The 10.6 AppKit release notes will have more on this topic[1]. -Ken Cocoa Frameworks [1] already do, for those who can read them. _______________________________________________ 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
