Created
September 23, 2016 03:41
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ImageProcessor - Sources - RGBAImage . swift
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| import UIKit | |
| public struct Pixel { | |
| public var value: UInt32 | |
| public var red: UInt8 { | |
| get { | |
| return UInt8(value & 0xFF) | |
| } | |
| set { | |
| value = UInt32(newValue) | (value & 0xFFFFFF00) | |
| } | |
| } | |
| public var green: UInt8 { | |
| get { | |
| return UInt8((value >> 8) & 0xFF) | |
| } | |
| set { | |
| value = (UInt32(newValue) << 8) | (value & 0xFFFF00FF) | |
| } | |
| } | |
| public var blue: UInt8 { | |
| get { | |
| return UInt8((value >> 16) & 0xFF) | |
| } | |
| set { | |
| value = (UInt32(newValue) << 16) | (value & 0xFF00FFFF) | |
| } | |
| } | |
| public var alpha: UInt8 { | |
| get { | |
| return UInt8((value >> 24) & 0xFF) | |
| } | |
| set { | |
| value = (UInt32(newValue) << 24) | (value & 0x00FFFFFF) | |
| } | |
| } | |
| } | |
| public struct RGBAImage { | |
| public var pixels: [Pixel] | |
| public var width: Int | |
| public var height: Int | |
| public init?(image: UIImage) { | |
| guard let cgImage = image.CGImage else { return nil } | |
| // Redraw image for correct pixel format | |
| let colorSpace = CGColorSpaceCreateDeviceRGB() | |
| var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue | |
| bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue | |
| width = Int(image.size.width) | |
| height = Int(image.size.height) | |
| let bytesPerRow = width * 4 | |
| let imageData = UnsafeMutablePointer<Pixel>.alloc(width * height) | |
| guard let imageContext = CGBitmapContextCreate(imageData, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) else { return nil } | |
| CGContextDrawImage(imageContext, CGRect(origin: CGPointZero, size: image.size), cgImage) | |
| let bufferPointer = UnsafeMutableBufferPointer<Pixel>(start: imageData, count: width * height) | |
| pixels = Array(bufferPointer) | |
| imageData.destroy() | |
| imageData.dealloc(width * height) | |
| } | |
| public func toUIImage() -> UIImage? { | |
| let colorSpace = CGColorSpaceCreateDeviceRGB() | |
| var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue | |
| bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue | |
| let bytesPerRow = width * 4 | |
| let imageDataReference = UnsafeMutablePointer<Pixel>(pixels) | |
| defer { | |
| imageDataReference.destroy() | |
| } | |
| let imageContext = CGBitmapContextCreateWithData(imageDataReference, width, height, 8, bytesPerRow, colorSpace, bitmapInfo, nil, nil) | |
| guard let cgImage = CGBitmapContextCreateImage(imageContext) else {return nil} | |
| let image = UIImage(CGImage: cgImage) | |
| return image | |
| } | |
| } |
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