Re: CALayer unwanted blurring
Re: CALayer unwanted blurring
- Subject: Re: CALayer unwanted blurring
- From: Matt Long <email@hidden>
- Date: Mon, 19 Jan 2009 16:07:34 -0700
How very interesting...
I wanted to confirm this so I wrote a little code. Here's an image of
the results.
http://cimgf.com/files/BlurryLayer.png
And here's the Xcode project:
http://cimgf.com/files/BlurryLayer.zip
Thanks for pointing that out David.
-Matt
On Jan 19, 2009, at 11:21 AM, David Duncan wrote:
On Jan 17, 2009, at 4:30 PM, Joe Wildish wrote:
Anyway, I did find a post on this list that mentions a similar
problem (http://www.cocoabuilder.com/archive/message/cocoa/2008/12/13/225352
). However, in my case I am not applying any transforms to the
layer hierarchy, and I am also ensuring that the frame origin of
each object is drawn at a "whole number" point (both of these
things are mentioned as potential causes in that thread).
Your suffering from the same problem as above. The frame origin is
not what matters, but rather the layer's position (all aspects of
the frame are synthesized from other properties of the layer).
Depending on if your layer's dimensions are odd or even the position
should be on the pixel or on the half pixel to avoid antialiasing
like this.
--
David Duncan
Apple DTS Animation and Printing
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