How do I combine two ore more CIImage

问题

How do I combine two or more CIImage into another one. I tried using ciContext.drawImage. How do I get a CGImage from it ?? What I have understood is that I am writing into a context from which I should be able to get an Image. Please let me know if I have understood anything wrong.

let eaglContext = EAGLContext(API: .OpenGLES2)
let ciContext = CIContext(EAGLContext: eaglContext)
ciContext.drawImage(firstCIImage, inRect: firstRect, fromRect: secondRect)
ciContext.drawImage(secondCIImage, inRect: secondRect, fromRect: secondRect)

回答1:

You may try something like that:

    var outputImage: CIImage?
    let images : Array<CIImage> = [] // add all your CIImages that you'd like to combine
    for image in images {
        outputImage = outputImage == nil ? image : image.imageByCompositingOverImage(outputImage!)
    }
    var cgImage: CGImageRef
    if let image = outputImage {
        let eaglContext = EAGLContext(API: .OpenGLES2)
        let ciContext = CIContext(EAGLContext: eaglContext)
        cgImage = ciContext.createCGImage(image, fromRect: image.extent)
    }

回答2:

You should use CIFilter-s for that :)

tutorial

来源：https://stackoverflow.com/questions/31996715/how-do-i-combine-two-ore-more-ciimage