A solution of converting bitmap to ImageRef in swift3.0

[thickfive]

I tried to get an image from an UInt8 arrary of RGBA, but i didn't get any useful method of how to covert it, until found soluton in your code.

Here is my code in swift3.0, hope that can help anyone else who meets the same problem.

Thanks!

 func imageRefFromBitmap() {

        //  CFData
        let size: (width: Int, height: Int) = (200, 150)
        let bitmapData = CFDataCreateMutable(nil, 0)
        CFDataSetLength(bitmapData, size.width * size.height * 4)

        //  BytePtr
        let bitmap = CFDataGetMutableBytePtr(bitmapData)

        //  RGBA, 0~255
        for i in 0..<size.height {
            for j in 0..<size.width {
                let k = 4 * (j + i * size.height)
                bitmap?[k+0] = 255  //  red
                bitmap?[k+1] = 0    //  green
                bitmap?[k+2] = 0    //  blue
                bitmap?[k+3] = 255  //  alpha
            }
        }

        //  CGImage
        let provider = CGDataProvider.init(data: bitmapData!)
        let imageRef = CGImage.init(width: size.width, height: size.height, bitsPerComponent: 8, bitsPerPixel: 4 * 8, bytesPerRow: 4 * size.width, space: CGColorSpaceCreateDeviceRGB(), bitmapInfo: [CGBitmapInfo.byteOrderMask, CGBitmapInfo.init(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)], provider: provider!, decode: nil, shouldInterpolate: false, intent: CGColorRenderingIntent.defaultIntent)

        //  In my case, self is an instance of UIView, it works fine
        layer.contents = imageRef
    }