How do I rotate a image pointed to by a CGImageRef

[Fastrak]

NSString* imageFileName = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"tree002.png"];
CGDataProviderRef provider = CGDataProviderCreateWithFilename([imageFileName UTF8String]);
CGImageRef myImage = CGImageCreateWithPNGDataProvider(provider, NULL, true, kCGRenderingIntentDefault);
CGDataProviderRelease(provider);

Anyone have a clean way to rotate the image pointed to by myImage?
I figure there is a call SOMEWHERE like:

[myImage setTransform: CGAffineTransformMakeRotation(3.14/2)];

but cannot find one.

[jeff_lamarche]

CIFilter *transform = [CIFilter filterWithName:@"CIAffineTransform"];
[transform setValue:img forKey:@"inputImage"];
NSAffineTransform *affineTransform = [NSAffineTransform transform];
[affineTransform rotateByDegrees:90];
[transform setValue:affineTransform forKey:@"inputTransform"];
CIImage * result = [transform valueForKey:@"outputImage"];

[Fastrak]

Maybe I am missing something simple but CIFilter is not included in the latest QuartzCore framework in the iPhone SDK.

Is there something else I need to do?

[bonehead]

Yeah I don't see CIFilter or CIImage either in beta3.

I'm assuming UIImage.imageOrientation won't do what you want? Looks like it just affects display.

I looked briefly for something that took the result of NSValue's
+ (NSValue *)valueWithCGAffineTransformCGAffineTransform)tr ansform

but I don't see anything obvious.l