Re: dataWithPDFInsideRect doesn't clip images within NSView
Re: dataWithPDFInsideRect doesn't clip images within NSView
- Subject: Re: dataWithPDFInsideRect doesn't clip images within NSView
- From: Graham Cox <email@hidden>
- Date: Thu, 27 Feb 2014 22:38:42 +1100
On 27 Feb 2014, at 9:31 pm, Leonardo <email@hidden> wrote:
> I draw an NSImage within an NSView scaling its size in order to fill the
> image within the view bounds. The image is larger than the NSView's bounds,
> but on the display it looks well clipped to those bounds.
>
> Since the image's NSView is a subView of the page's NSView, I create a PDF
> saving that page's NSView
>
> [pageView dataWithPDFInsideRect:pageRect];
>
> and I get a pdf file. Anyway, when I inspect the pdf file with Acrobat, I
> clearly see that the image hasn't been cropped. As I see from the blue
> rectangle around the visible small image, the whole original and larger
> image has been embedded within the pdf document.
> In facts if I Control-Click-Edit the image on the pdf, I get the original
> whole image. So the pdf file size results bigger than what it would really
> be. I don't get this trouble when saving the page to a TIFF or any other
> raster image file (with NSBitmapImageRep -> CGImage ->
> displayRectIgnoringOpacity -> CGImageDestinationFinalize).
This is exactly what you'd expect. Core Graphics basically *is* a PDF. So when you draw an image into a view that is clipped, all you're doing is setting a clipping path and drawing an image. The PDF faithfully records that.
When you create a different image that is clipped to the smaller area, then that's what is recorded.
> My question:
> Do you know an option, any API, to clip the image to its NSView's frame on
> the pdf, as it properly looks on the display? Or should I clip the image by
> my own code?
When you know how it works, the question becomes moot. The short answer is 'no', there's no API. You have to resample/crop the image as you need, or accept the larger filesize for the convenience that you get from the simple API.
--Graham
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