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Core Graphics wants 10 petabytes of RAM
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Core Graphics wants 10 petabytes of RAM


  • Subject: Core Graphics wants 10 petabytes of RAM
  • From: Thomas Davie <email@hidden>
  • Date: Tue, 7 Sep 2010 13:07:41 +0100

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);
    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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