Re: Forcing NSImage to cache images at certain sizes
Re: Forcing NSImage to cache images at certain sizes
- Subject: Re: Forcing NSImage to cache images at certain sizes
- From: Ken Ferry <email@hidden>
- Date: Fri, 21 May 2010 19:10:29 -0700
Hi BJ,
On Fri, May 21, 2010 at 2:44 PM, B.J. Buchalter <email@hidden> wrote:
> I read the NSImage and Cocoa drawing guide docs, which tends to indicate
> that calling drawInRect:fromRect:operation:fraction: on an NSImage will
> cause it to create a cached image rep that matches the scaled image so that
> the next time it is drawn it does not need to be scaled again.
>
The docs haven't fully integrated new info from 10.6, when NSImage changed a
bunch. Take a look at the AppKit release
notes<http://developer.apple.com/mac/library/releasenotes/cocoa/appkit.html>
.
>
> That is not what I am seeing here, and the scaling is definitely taking a
> nontrivial amount of time when redrawing my views. I have played around with
> setting the caching and scaling on the NSImage, but it doesn't appear to be
> having any impact (the internal image rep for the image never changes).
>
Could you attach a test app please? There's more than one thing that could
be the issue.
>
> What is the proper way to ensure that the NSImage is cached to match the
> required drawing size? Do I need to build my own cache?
>
> Thanks!
>
> B.J. Buchalter
> Metric Halo
> http://www.mhlabs.com
>
>
>
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