UIImage+Decompression.swift

//
//  UIImage+Decompression.swift
//  Contis Protocol
//
//  Created by Nigel Barber on 01/03/2017.
//  Copyright © 2017 @mindbrix. All rights reserved.
//

import CoreGraphics
import ImageIO
import UIKit

extension UIImage {
    static func decompressedCGImageWithData(data: NSData) -> CGImageRef? {
        if let source = CGImageSourceCreateWithData(data as CFData, nil) {
            if let image = CGImageSourceCreateImageAtIndex(source, 0, nil) {
                let width = CGImageGetWidth(image), height = CGImageGetHeight(image)
                let BGRA = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue | CGBitmapInfo.ByteOrder32Little.rawValue)
                if let ctx = CGBitmapContextCreate(nil, width, height, 8, width * 4, CGColorSpaceCreateDeviceRGB(), BGRA.rawValue) {
                    CGContextSetBlendMode(ctx, .Copy)
                    CGContextSetInterpolationQuality(ctx, .None)
                    CGContextDrawImage(ctx, CGRectMake(0, 0, CGFloat(width), CGFloat(height)), image)
                    
                    return CGBitmapContextCreateImage(ctx)
                }
            }
        }
        return nil
    }
}