The function CGContextDrawPDFDocument scales up nicely.
-----Original Message-----
From: quartz-dev-bounces+ejkerr=email@hidden
[mailto:quartz-dev-bounces+ejkerr=email@hidden] On Behalf
Of Derek Clegg
Sent: Thursday, March 31, 2005 12:28 PM
To: David Niemeijer
Cc: email@hidden
Subject: Re: CGPDFPageGetDrawingTransform refuses to upscale
On Mar 31, 2005, at 5:02 AM, David Niemeijer wrote:
> 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?
For good or for ill, what you are seeing is the correct behavior.
For upscaling, the "easiest" thing to do is to scale the context
yourself before using the drawing transform.
Derek
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