Re: Lock/unlock focus does not draw image in Snow Leopard

On Aug 29, 2009, at 6:18, Adam R. Maxwell wrote:

>
> On Aug 28, 2009, at 7:48 PM, Michael McCulloch wrote:
>
>> Actually lockFocus on an image is perfectly reasonable and legit.  
>> My situation is that I have a bunch of smaller "master" images that  
>> are used to build bigger composited images based on program  
>> context, so my draw selector does all that work. It basically  
>> selects rects from the masters and builds a composite image result.  
>> Keeping the master images small at design time considerably reduces  
>> the size of my distribution.
>
> It's not clear what you expect to happen here, since what you're  
> doing seems at best undefined.  If you want to draw the  
> NSCustomImageRep in an NSImage, send lockFocus to the NSImage and  
> then draw the rep without adding it.  You are adding the  
> NSCustomImageRep to an NSImage, then drawing that same rep to the  
> same NSImage.  That draws into some internal image rep of the image  
> (likely an NSCachedImageRep, at least in 10.5 and earlier), and  
> probably does various other odd things.  What are you doing with  
> that NSImage?
>



Michael,

I think what you want is something like lockFocusOnRepresentation:,  
right? You should definitely read the Snow Leopard AppKit release  
notes about this now deprecated (because rather confusing) method, I  
think it might give you the insight you need.

Christiaan