我如何结合两个以上的CIImage

Question

如何将两个或多个CIImage合并到另一个CIImage中。我尝试使用ciContext.drawImage。我如何从中获得CGImage？我所理解的是，我正在写一个上下文，我应该可以从中获得一个图像。如果我理解错误，请告诉我。

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

Answer 1

您可以尝试这样的事情：

    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)
    }

Answer 2

您应该使用CIFilter-s：）

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