Pixel Array to UIImage in Swift

Question

I\'ve been trying to figure out how to convert an array of rgb pixel data to a UIImage in Swift.

I\'m keeping the rgb data per pixel in a simple struct:

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Answer 1

Update for Swift 3

struct PixelData {
    var a: UInt8 = 0
    var r: UInt8 = 0
    var g: UInt8 = 0
    var b: UInt8 = 0
}

func imageFromBitmap(pixels: [PixelData], width: Int, height: Int) -> UIImage? {
    assert(width > 0)

    assert(height > 0)

    let pixelDataSize = MemoryLayout.size
    assert(pixelDataSize == 4)

    assert(pixels.count == Int(width * height))

    let data: Data = pixels.withUnsafeBufferPointer {
        return Data(buffer: $0)
    }

    let cfdata = NSData(data: data) as CFData
    let provider: CGDataProvider! = CGDataProvider(data: cfdata)
    if provider == nil {
        print("CGDataProvider is not supposed to be nil")
        return nil
    }
    let cgimage: CGImage! = CGImage(
        width: width,
        height: height,
        bitsPerComponent: 8,
        bitsPerPixel: 32,
        bytesPerRow: width * pixelDataSize,
        space: CGColorSpaceCreateDeviceRGB(),
        bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedFirst.rawValue),
        provider: provider,
        decode: nil,
        shouldInterpolate: true,
        intent: .defaultIntent
    )
    if cgimage == nil {
        print("CGImage is not supposed to be nil")
        return nil
    }
    return UIImage(cgImage: cgimage)
}