Thanks for your response.
As you may have guessed, the HIViewRef/CGContextRef confusion was just
a mistake in summarizing my own code for my previous email; also the
CGContextBeginPage/CGContextEndPage was a vestigial artifact of the
random things I was trying. I also said my bitmap bits were
untouched; I meant to say that I was getting just an all-white bitmap.
Such is the peril of writing a technical email at 1:30 AM.
Unfortunately, I still have the same problem when I replace my code
with the two functions provided in link: an all-white bitmap (255 255
255 ...) instead of the window's contents.
I might suspect the window needs to be marked as dirty right before
the blit, but as I mentioned earlier I've tried calling various
updating/dirtying functions as well as sending update/draw events, all
without effect.
-jeff
--- David Duncan <email@hidden> wrote:
> On Mar 12, 2007, at 10:35 PM, Jeff Sparks wrote:
>
> > HIViewRef context = CGBitmapContextCreate(
> > my_surface.bits,
> > my_surface.width,
> > my_surface.height,
> > 8,
> > my_surface.pitch,
> > CGImageGetColorSpace(image),
> > CGImageGetBitmapInfo(image)) ;
>
> Two things here
> 1) CGBitmapContextCreate returns a CGContextRef, not an HIViewRef.
> 2) You generally can't pass the results of CGImageGetBitmapInfo
> directly to CGBitmapContextCreate as images can have some bitmap info
> that is invalid for a CGContext, so you may want to check that
> CGBitmapContextCreate isn't returning NULL.
>
> To see one way of dealing with this, check out Q&A 1509 Getting the
> pixel data from a CGImage object
> <http://developer.apple.com/qa/qa2007/qa1509.html>
>
> > CGContextBeginPage(context, &bounds) ;
> > CGContextDrawImage(context, bounds, image) ;
> > CGContextEndPage(context) ;
>
> I'm not certain exactly why your using CGContextBegin/EndPage but it
> shouldn't be necessary here.
> --
> Reality is what, when you stop believing in it, doesn't go away.
> Failure is not an option. It is a privilege reserved for those who try.
>
> David Duncan
>
>
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