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Re: Bilt HIView to Offscreen bitmap

Subject: Re: Bilt HIView to Offscreen bitmap
From: David Duncan <email@hidden>
Date: Mon, 12 Mar 2007 23:32:04 -0700
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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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