Re: How to draw a CGImage object to a NSView?
Re: How to draw a CGImage object to a NSView?
- Subject: Re: How to draw a CGImage object to a NSView?
- From: "Ken Ferry" <email@hidden>
- Date: Wed, 20 Feb 2008 15:44:26 -0800
On Wed, Feb 20, 2008 at 3:26 PM, Jim Correia <email@hidden> wrote:
> On Feb 20, 2008, at 5:29 PM, Ken Ferry wrote:
>
> >> I think it will cost too much performance to convert the CGImage
> >> objects to other formats, e.g. NSImage, CIImage.
> >
> > It isn't very expensive to make an NSImage from a CGImage. If you
> > create an NSBitmapImageRep with -initWithCGImage:, the
> > NSBitmapImageRep will just reference the CGImage and draw it when
> > necessary. There is no conversion of the data.
>
> It is worth pointing out that an NSBitmapImageRep created in this way
> is dependent on the CGImage - the CGImage's lifetime must be at least
> that of the dependent bitmap image rep.
>
> http://lists.apple.com/archives/cocoa-dev/2008/Jan/msg01474.html
>
> http://lists.apple.com/archives/cocoa-dev/2008/Jan/msg01481.html
That's reversed. The limitation is that if you take a CGImage from an
arbitrary NSBitmapImageRep with -CGImage, the CGImage may undetectably
go invalid when the bitmap is destroyed.
Hopefully this issue will be lifted in a future release.
-Ken
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