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Re: QC comp to return CIImage instead of NSImage?

Subject: Re: QC comp to return CIImage instead of NSImage?
From: Dominik Westner <email@hidden>
Date: Thu, 25 Jan 2007 19:48:35 +0100
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On

I have a QC composition, using just a VideoInput and a Sprite.
The VideoInput's "Image" output is published.
I run this from a Cocoa app, rendering it into a QCView.
When I access the image using:
     id anImage=[qcView valueForOutputKey:@"Image"];
...the object in anImage is an NSImage.
Is there any way to make it so I can get back a CIImage instead? I just want to feed anImage into a CIFilter. I'm trying to avoid using: [CIImage imageWithData:[anImage TIFFRepresentation]]
Roland

Well, actually a QC Composition should probably return an NSImage with a NSCIImageRep, so you could do something like this.

Here is a category on NSImage, which returns a CIImage, either from the NSCIImageRep if one exists or by creating a new CIImage from NSImage's bitmapRepresentation.

-(CIImage*) CIImage { NSCIImageRep* rep = [self ciimageRepresentation]; if(rep) { return [rep CIImage]; } NSLog(@"No ciimage rep found -- creating one"); CIImage* result = [[[CIImage alloc] initWithBitmapImageRep:[self bitmapRepresentation]] autorelease]; [self addRepresentation:[NSCIImageRep imageRepWithCIImage:result]]; return result; }

-(NSCIImageRep*) ciimageRepresentation {
	NSEnumerator *enumerator = [[self representations] objectEnumerator];
    NSImageRep *representation;
    while (representation = [enumerator nextObject]) {
        if ([representation isKindOfClass:[NSCIImageRep class]]) {
            return (NSCIImageRep *)representation;
        }
    }
	return nil;
}


Dominik
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