Re: CGImage to NSImage, or PDFPage?
Re: CGImage to NSImage, or PDFPage?
- Subject: Re: CGImage to NSImage, or PDFPage?
- From: Brian Postow <email@hidden>
- Date: Tue, 10 Aug 2010 18:49:22 -0400
On Aug 10, 2010, at 6:02 PM, Nick Zitzmann wrote:
>
> On Aug 10, 2010, at 3:45 PM, Brian Postow wrote:
>
>> Is there something obvious that I'm missing?
>
> Yes. If you can require Leopard or later, then just create an NSBitmapImageRep using -initWithCGImage:, then create the NSImage with the size of the CGImage and add that NSBitmapImageRep to the NSImage. If not, then create a new image with the size of the CGImage, lock focus on the image, draw the CGImage using CGContextDrawImage(), and unlock focus.
>
> Nick Zitzmann
> <http://www.chronosnet.com/>
>
>
Excellent! Now is there an easier way to get the CGImage out of the PDFPage than:
PDFPage * pg = [doc pageAtIndex: pageNum -1];
NSData* imgData = [pg dataRepresentation];
NSImage* img = [[NSImage alloc] initWithData:imgData ];
imgData = [img TIFFRepresentation];
CGImageSourceRef imageSource =
CGImageSourceCreateWithData((CFDataRef)imgData, NULL);
NSDictionary * options = [NSDictionary dictionaryWithObject:
(id)kCFBooleanTrue
forKey: (id) kCGImageSourceShouldCache];
CGImageRef imgRef = CGImageSourceCreateImageAtIndex(imageSource, 0, options);
? About 1/2 of the time I seem to be crashing in the dataRepresentation call for some reason...
Brian Postow
Senior Software Engineer
Acordex Imaging Systems
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