On Sun, Feb 17, 2013, at 05:12 PM, iain wrote: > > Does anyone have any hints of something I may have missed, or something > I'm > going about the wrong way?
Unless there's something you haven't told us, you shouldn't need to keep track of your visible rect at all. It sounds like you're trying to be really smart and only cache the drawing necessary for your visible rect rather than the more naive approach of drawing a cache for your entire view whenever its bounds change. Is this really a performance boost for you? You say that the drawing is complicated; if by this you mean that you spend a lot of time doing things other than blitting pixels, you are doing yourself a disservice by drawing minimally. It would be faster for you to cache the entire view at once. If it really is an advantage for you to cache only the pixels that are going to be in your visible rect, you can override -viewWillDraw to call -getRectsBeingDrawn:… and be super-smart about your caching. But I suggest you do some profiling and see whether you gain time by overriding -setFrameSize: to set a flag that you pick up in an override of -viewWillDraw to render a cache for the entire bounds of your view. --Kyle Sluder _______________________________________________ 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: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
