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Re: Core Graphics wants 10 petabytes of RAM
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Re: Core Graphics wants 10 petabytes of RAM


  • Subject: Re: Core Graphics wants 10 petabytes of RAM
  • From: Guillem Palou <email@hidden>
  • Date: Tue, 7 Sep 2010 14:10:36 +0200

On Sep 7, 2010, at 2:07 PM, Thomas Davie wrote:

> I'm having a problem with CoreGraphics periodically deciding it wants to allocate an enormous amount of RAM, the code in question is simply trying to create an NSImage from raw data:
>
>    CGContextRef context = CGBitmapContextCreate(imgData,
>                                              width,
>                                              height,
>                                              8,
>                                              4 * width,
>                                              colourSpace,
>                                              kCGBitmapByteOrderDefault | kCGImageAlphaPremultipliedLast);
>    CGImageRef cgImage = CGBitmapContextCreateImage(ctx);

Should be CGImageRef cgImage = CGBitmapContextCreateImage(context); ??


>    NSImage *i = [[[NSImage alloc] initWithCGImage:cgImage size:NSMakeSize(width, height)] autorelease];
>    CGImageRelease(cgImage);
>    CGContextRelease(context);
>    CGColorSpaceRelease(colourSpace);
>
> Creating the image (the call to CGBitmapContextCreateImage) sometimes (seemingly at random) produces this error:
> <Error>: CGDataProviderCreateWithCopyOfData: failed to vm_allocate 10248191152060862009 bytes: 3.
>
> And returns a nil image.  Applying the debugger finds that width, height and imgData are all sane values (512, 512, and 512 * 512 * 4 bytes of data).
>
> Cheers to anyone who knows what's up.
>
> Bob
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