Re: CGLayer resolution on iPhone with Retina display
Re: CGLayer resolution on iPhone with Retina display
- Subject: Re: CGLayer resolution on iPhone with Retina display
- From: David Duncan <email@hidden>
- Date: Sun, 29 Aug 2010 10:53:54 -0700
I would recommend you file a bug.
--
David Duncan
On Aug 29, 2010, at 9:38 AM, Matt Neuburg <email@hidden> wrote:
> On or about 8/28/10 9:31 PM, thus spake "David Duncan"
> <email@hidden>:
>
>> In the case of iOS for example, caching contents to CGLayers is rarely useful
>> because it is rarely useful to use a software cache – it is usually far more
>> useful to use a hardware cache, which means CALayer or UIView, not CGLayer.
>
> I bow to all you say; still the question remains whether, taken
> dispassionately and in the abstract, it might be a useful behavior if
> calling CGLayerCreateWithContext() would cause the resulting CGLayer to have
> the "resolution" of the context from which it is created, as advertised, so
> that drawing back into the same context with e.g. CGContextDrawLayerAtPoint
> would not cause the ultimate drawing to have half the "resolution" on the
> iPhone 4?
>
> Just to repeat, the flag-drawing example on this page:
>
> <http://developer.apple.com/iphone/library/documentation/GraphicsImaging/Con
> ceptual/drawingwithquartz2d/dq_layers/dq_layers.html>
>
> ...is Apple's own, and behaves undesirably when the screen is
> double-resolution, visibly drawing the flag's stars in single resolution. m.
>
> --
> matt neuburg, phd = email@hidden, http://www.tidbits.com/matt/
> pantes anthropoi tou eidenai oregontai phusei
> Among the 2007 MacTech Top 25, http://tinyurl.com/2rh4pf
> AppleScript: the Definitive Guide, 2nd edition
> http://www.tidbits.com/matt/default.html#applescriptthings
> Take Control of Exploring & Customizing Snow Leopard
> http://tinyurl.com/kufyy8
> RubyFrontier! http://www.apeth.com/RubyFrontierDocs/default.html
> TidBITS, Mac news and reviews since 1990, http://www.tidbits.com
>
>
>
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