Compact Image Buffer Maker

import CoreGraphics
import CoreImage

public struct ImageBufferMaker {

    let image: CIImage

    public init(image: CIImage) {
        self.image = image
    }

    public func makeBuffer() -> [UInt8] {
        let context = CIContext()
        let ciimage = image
        let dimension = ciimage.extent.width * ciimage.extent.height
        var bitmap = [UInt8](repeating: 0, count: 4 * Int(dimension)) // 4 'инта по 8 бит' на пиксель
        context.render(ciimage,
                       toBitmap: &bitmap,
                       rowBytes: 4 * Int(ciimage.extent.width),
                       bounds: ciimage.extent,
                       format: CIFormat.RGBA8,
                       colorSpace: CGColorSpaceCreateDeviceRGB()
        )
        return bitmap
    }
}

// Usage
let text = "/Users/yourname/Desktop/image.jpg"
let url = URL(fileURLWithPath: text)
let photo = CIImage(contentsOf: url)!
let buffer = ImageBufferMaker(image: photo).makeBuffer()
print("buffer: \(buffer)")