像素阵列来的UIImage斯威夫特

问题描述

我一直在试图找出如何RGB像素数据的数组转换为斯威夫特一个UIImage。

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

我让每个像素的RGB数据在一个简单的结构：

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

public struct PixelData {
   var a: Int
   var r: Int
   var g: Int
   var b: Int
}

我做了我的方式，下面的函数，但产生的图像是不正确：

I've made my way to the following function, but the resulting image is incorrect:

func imageFromARGB32Bitmap(pixels:[PixelData], width: Int, height: Int)-> UIImage {
    let rgbColorSpace = CGColorSpaceCreateDeviceRGB()
    let bitmapInfo:CGBitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedFirst.rawValue)
    let bitsPerComponent:Int = 8
    let bitsPerPixel:Int = 32

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

    var data = pixels // Copy to mutable []
    let providerRef = CGDataProviderCreateWithCFData(
        NSData(bytes: &data, length: data.count * sizeof(PixelData))
    )

    let cgim = CGImageCreate(
        width,
        height,
        bitsPerComponent,
        bitsPerPixel,
        width * Int(sizeof(PixelData)),
        rgbColorSpace,
        bitmapInfo,
        providerRef,
        nil,
        true,
        kCGRenderingIntentDefault
    )
    return UIImage(CGImage: cgim)!
}

有关如何在RGB排列正确转换到一个UIImage的任何提示或指针？

Any tips or pointers on how to properly convert an rgb array to an UIImage?

推荐答案

您唯一的问题是，在你的 PixelData取出结构中的数据类型必须是 UINT8 。我创建了以下在操场测试图像：

Your only problem is that the data types in your PixelData structure need to be UInt8. I created a test image in a Playground with the following:

public struct PixelData {
    var a: UInt8
    var r: UInt8
    var g: UInt8
    var b: UInt8
}

var pixels = [PixelData]()

let red = PixelData(a: 255, r: 255, g: 0, b: 0)
let green = PixelData(a: 255, r: 0, g: 255, b: 0)
let blue = PixelData(a: 255, r: 0, g: 0, b: 255)

for i in 1...300 {
    pixels.append(red)
}
for i in 1...300 {
    pixels.append(green)
}
for i in 1...300 {
    pixels.append(blue)
}

let image = imageFromARGB32Bitmap(pixels, 30, 30)

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