On Tue, Apr 6, 2010 at 5:24 PM, Chris Tracewell <ch...@thinkcl.com> wrote:
> > On Apr 6, 2010, at 4:50 PM, Ken Ferry wrote: > > > On Tue, Apr 6, 2010 at 2:58 PM, Jens Alfke <j...@mooseyard.com> wrote: > >> >> On Apr 6, 2010, at 1:17 PM, Chris Tracewell wrote: >> >> I am trying to get NSImageView to alias dropped images, but it refuses. >>> >> >> Nitpick: you mean "antialias". Aliasing is what creates the jaggies, >> antialiasing smooths them away. >> >> >> Just spent an hour looking and trying several variations to no avail. >>> Here's what I have done in a subclass of NSImageView. >>> >> >> I remember having to deal with this too, years ago. It's too bad AppKit >> hasn't added support for this yet :( >> >> The problem is that NSImageView internally keeps a scaled copy of the >> image. So the actual scaling that creates the aliasing isn't done in the >> drawRect: method at all. >> > > This was once true, but is out of date. I'd like to see a test app. For > example, how do you know you aren't getting antialiasing? It may be that > you just don't like the output. :-) > > > Well - NSImageInterpolationHigh and NSImageInterpolationNone produce the > same exact result - screen shot copy (control-command-shift-4) > the imageView built once using NSImageInterpolationHigh and once > using NSImageInterpolationNone then paste each into a Photoshop layer, align > them perfectly and then turn the top layer off and on at 800% and there is > not a single pixel that moves or changes color. > > The dropped image is roughly 1000 x 1000 (a screen shot PNG) and the > imageView size is 200x200 > > To make sure the currentContext was correct - I log [[NSGraphicsContext > currentContext] imageInterpolation] for each build and it shows the correct > values 3 and 1 respectively. And then just to be super sure I I > log [[NSGraphicsContext currentContext] isDrawingToScreen] inside drawRect > of my NSImageView subclass and get YES. > > I did implement my own image sizing in drawRect and then used [self > setImage] and it works great. Not sure what could be the issue. > > > It would also be good to know what OS you are working on. > > -Ken > > > > I'm using 10.5.8. - XCode 3.1.2 - iMac Core 2 Duo and the app is GC. > What Jens is saying is probably true in 10.5, not in 10.6. Nevertheless, I would be interested to see a test app. -Ken Cocoa Frameworks _______________________________________________ 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
