CGImageCreate 在 swift 中给出错误

Question

我正在尝试将图像像素绘制到图形上下文中以迭代和打印图像的色彩空间信息值。我设法缓冲了所有原始像素值。但是我尝试使用 CGImageCreate 绘制位图图像时遇到了以下错误，同样是screenshot attached。这是我写的代码。

func createRGBAPixel(inImage: CGImageRef) -> CGContextRef {
//Image width, height

let pixelWidth = CGImageGetWidth(inImage)
let pixelHeight = CGImageGetHeight(inImage)

//Declaring number of bytes 

let bytesPerRow = Int(pixelWidth) * 4
let byteCount = bytesPerRow * Int(pixelHeight)

//RGB color space

let colorSpace = CGColorSpaceCreateDeviceRGB()

//Allocating image data

let mapData = malloc(byteCount)
let mapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.PremultipliedFirst.rawValue)

//Create bitmap context

let context = CGBitmapContextCreate(mapData, pixelWidth, pixelHeight, Int(8), Int(bytesPerRow), colorSpace, mapInfo.rawValue)

let imageRef = CGBitmapContextCreateImage(context)


CGContextDrawImage(context, CGRectMake(0, 0, pixelWidth, pixelHeight), imageRef)


let data = CGDataProviderCopyData(CGImageGetDataProvider(imageRef)) as! NSData
let pixels = UnsafePointer<UInt8>(data.bytes)
var newPixelsArray = [UInt8](count: byteCount, repeatedValue: 0)
let provider = CGDataProviderCreateWithData(nil , &newPixelsArray, data.length, nil)
let newImageRef = CGImageCreate(pixelWidth, pixelHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBitsPerPixel(imageRef), bytesPerRow, colorSpace, mapInfo, provider, nil, false, kCGRenderingIntentDefault)


return context!

CGImageCreate 在“kCGRenderingIntentDefault”处给出错误，说“未解析的标识符”。我也导入了 coreGraphics，它在这个地方不接受任何值。可以提出什么建议？

请帮忙。

Answer 1

由于 Swift SDK 对此类枚举所做的事情，您必须将 kCGRenderingIntentDefault 替换为 .defaultIntent，如下所示：

let newImageRef = CGImageCreate(pixelWidth, pixelHeight, CGImageGetBitsPerComponent(imageRef), CGImageGetBitsPerPixel(imageRef), bytesPerRow, colorSpace, mapInfo, provider, nil, false, .defaultIntent)