Ios 渲染MTIImage_Ios_Swift_Metal - Fatal编程技术网

Ios 渲染MTIImage

ios swift

Ios 渲染MTIImage,ios,swift,metal,Ios,Swift,Metal,请不要评判我，我只是在学斯威夫特最近，我安装了Metalpatal framework，并按照说明进行操作：但是由于MTIContext，我得到了一个错误。也许我需要申报更多的金属花瓣我的代码： import UIKit import MetalPetal import CoreGraphics class ViewController: UIViewController { @IBOutlet weak var image1: UIImageView! overri

请不要评判我，我只是在学斯威夫特

最近，我安装了Metalpatal framework，并按照说明进行操作：

但是由于MTIContext，我得到了一个错误。也许我需要申报更多的金属花瓣

我的代码：

import UIKit
import MetalPetal
import CoreGraphics

class ViewController: UIViewController {

    @IBOutlet weak var image1: UIImageView!
    override func viewDidLoad() {

        super.viewDidLoad()




        weak var image: UIImage?
        image = image1.image
        var ciImage = CIImage(image: image!)
        var cgImage1 = convertCIImageToCGImage(inputImage: ciImage!)
        let imageFromCGImage = MTIImage(cgImage: cgImage1!)


        let inputImage = imageFromCGImage
        let filter = MTISaturationFilter()
        filter.saturation = 1
        filter.inputImage = inputImage

        let outputImage = filter.outputImage


        let context = MTIContext()

        do {
            try context.render(outputImage, to: pixelBuffer)

            var image3: CIImage? = try context.makeCIImage(from: outputImage!)

            //context.makeCIImage(from: image)

            //context.makeCGImage(from: image)
        } catch {
            print(error)
        }





        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    func convertCIImageToCGImage(inputImage: CIImage) -> CGImage? {
        let context = CIContext(options: nil)
        if let cgImage = context.createCGImage(inputImage, from: inputImage.extent) {
            return cgImage
        }
        return nil
    }

}

@YuAo

输入图像

UIImage基于基础石英图像（可使用cgImage检索）或基础岩心图像（可使用ciImage从UIImage检索）

MTIImage为这两种类型提供构造函数

MTIContext

MTIContext必须使用可通过调用MTLCreateSystemDefaultDevice（）检索的设备进行初始化

渲染

不需要渲染到像素缓冲区。我们可以通过调用makeCGImage得到结果

测试

我已经在上面介绍了您的源代码，并对其稍作修改以适应上述要点

我还添加了第二个UIImageView以查看过滤结果。我还将饱和度更改为0，以查看过滤器是否工作

如果涉及GPU或着色器，那么在真实设备上测试而不是在模拟器上测试是有意义的

结果如下所示：

override func viewDidLoad() {

    super.viewDidLoad()

    guard let image = UIImage(named: "regensburg.jpg") else { return }
    guard let cgImage = image.cgImage else { return }

    imageView1.image = image

    let filter = MTISaturationFilter()
    filter.saturation = 0
    filter.inputImage = MTIImage(cgImage: cgImage)

    if let device = MTLCreateSystemDefaultDevice(),
        let outputImage = filter.outputImage {
        do {
            let context = try MTIContext(device: device)
            let filteredImage = try context.makeCGImage(from: outputImage)
            imageView2.image = UIImage(cgImage: filteredImage)
        } catch {
            print(error)
        }
    }
}

在上面的区域中，您可以看到原始jpg，在下面的区域中，应用了过滤器

Swift

产生此结果的简化Swift代码如下所示：

override func viewDidLoad() {

    super.viewDidLoad()

    guard let image = UIImage(named: "regensburg.jpg") else { return }
    guard let cgImage = image.cgImage else { return }

    imageView1.image = image

    let filter = MTISaturationFilter()
    filter.saturation = 0
    filter.inputImage = MTIImage(cgImage: cgImage)

    if let device = MTLCreateSystemDefaultDevice(),
        let outputImage = filter.outputImage {
        do {
            let context = try MTIContext(device: device)
            let filteredImage = try context.makeCGImage(from: outputImage)
            imageView2.image = UIImage(cgImage: filteredImage)
        } catch {
            print(error)
        }
    }
}