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CGPDFPageGetDrawingTransform refuses to upscale

Hi,

I  am drawing a PDF page like this:

pageRef = CGPDFDocumentGetPage(inPDFDoc, 1) ;
pageTransform = CGPDFPageGetDrawingTransform (pageRef, kCGPDFArtBox, inRect, 0, true) ;
CGContextConcatCTM (inContext, pageTransform);
CGContextDrawPDFPage (inContext, pageRef);

What I am seeing is that the image scales as long as inRect is smaller than the artBox of the PDF, but as soon as inRect is larger than the artBox of the PDF no scaling occurs. So I can effectively downscale my image to fit a smaller inRect, but not upscale it to fit a larger inRect. This is on 10.3.8.

Am I doing something wrong? Should I use another method for drawing? Is there something I need to do to get upscaling or is this a bug?

Thanks,

david.
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