Thanks --

Tried that, but I was still getting the image cleared in the CGLayer.  Perhaps 
I hadn't set it up properly.

brad
http://music.columbia.edu/~brad


On May 31, 2010, at 2:11 PM, Alastair Houghton wrote:

> On 30 May 2010, at 22:30, Brad Garton wrote:
> 
>> To answer my own question:  draw to a bitmap offscreen, and then draw that 
>> into the UIView rect.  The bitmap isn't cleared (unless done explicitly).
> 
> Hi Brad,
> 
> Depending on the application, it may be better to use a CGLayer rather than a 
> CGBitmapContext.
> 
> Kind regards,
> 
> Alastair.
> 
> --
> http://alastairs-place.net
> 
> 
> 
> 

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