On Sun, Aug 29, 2010 at 2:10 PM, David Duncan <david.dun...@apple.com>wrote:
> On Aug 29, 2010, at 11:21 AM, Matt Neuburg wrote: > > > On or about 8/28/10 9:31 PM, thus spake "David Duncan" > > <david.dun...@apple.com>: > > > >> it is usually far more > >> useful to use a hardware cache, which means CALayer or UIView, not > CGLayer. > > > > Sorry to keep coming back to this, but the documentation implies that > > CGLayer *is* a hardware cache - that's why I was using it. For example, > the > > documentation says: > > It is (potentially) a hardware cache on the desktop in certain situations. > Nothing in CG is hardware accelerated on iOS however, and CGLayer is no > exception. > Additionally, I don't think it's actually hardware accelerated on the desktop either. In practice at the moment, a CGLayer is basically a CGImage together with a CGBitmapContext. I can think of case where something different happens, but that case still doesn't use the GPU. -Ken Cocoa Frameworks > > >> Before you call this or any routine that uses CGLayer objects, you must > check > >> to make sure that the system is running Mac OS X v10.4 or later and has > a > >> graphics card that supports using CGLayer objects > > > > This suggests that CGLayer is implemented in hardware; otherwise surely > the > > check for a proper graphics card wouldn't be necessary? But perhaps I'm > > misunderstanding.... m. > > > If you require hardware acceleration of CGLayer objects perhaps, but to > simply use CGLayers requires no such check. This would be a bug in the > documentation. > > Much of the shared documentation between iOS and Mac OS X will contain > information that is incorrect for one platform or another. We strive to > point out where information applies to only one platform or another, but > this is an ongoing effort. > -- > David Duncan > > _______________________________________________ > > 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/kenferry%40gmail.com > > This email sent to kenfe...@gmail.com > _______________________________________________ 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
