Re: CALayer content looks "blurry"
Re: CALayer content looks "blurry"
- Subject: Re: CALayer content looks "blurry"
- From: David Duncan <email@hidden>
- Date: Thu, 17 Jan 2008 10:39:09 -0800
On Jan 17, 2008, at 7:38 AM, Michael wrote:
in the past several days I was playing with Core Animation. I'm
playing with an app holding images and bezier path as content of a
view. I moved the view drawing operation "into" a CALayer. Comparing
the output of the "old" view based drawing with the CALayer output,
the CALayer output looks blurry. For example the images are not as
crisp in the details and the lines drawn by the bezier path are not
as sharp as drawn in the view.
Are you sure the layer is placed on an integer boundary? If the layer
is not placed on an integral boundary then it will show interpolation
artifacts (which typically makes a layer look blurry). If your setting
the frame you can usually fix this by making sure that the frame is
passed through CGRectMakeIntegral() before you set it on the layer. If
your setting the position then you need to account for the anchorPoint
and the size of the layer to make sure that it is set integrally (it
might be easier to calculate a frame and then set that instead).
This may also be caused by having set a transform on the layer or a
parent layer (via either the transform or sublayerTransform
properties). If these scale the coordinate system in some way then you
may be seeing the layer contents scaled. Core Animation always uploads
layer content at the size of the layer, not at its scaled size, so
this could also be causing your issues.
--
David Duncan
Apple DTS Animation and Printing
email@hidden
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