XAMARIN ANDROID：抗锯齿问题

Question

我们创建了一种方法，可以从图像中剪切圆圈，然后使用边框显示它。问题是，即使将抗锯齿设置为“true”，它看起来像这样：

您可以清楚地看到，圆形图像非常像素化。这是我们用来调试的三星S6的截图。

这是有问题的代码：

// Image file which you want to upload.
guard let image = UIImage(named: "YourImage") else { return }


                let imgRep : NSBitmapImageRep = image.representations.first as! NSBitmapImageRep

                let imgData : Data = imgRep.representation(using: .PNG, properties: [:])!


                let cameraFileName    = "some_random_name_img.png"

                let fileUrl = URL(fileURLWithPath: cameraFileName, isDirectory: true)
                do {

                    try imgData.write(to: fileUrl, options: NSData.WritingOptions.atomic)

                    DispatchQueue.main.async {
                        // Stop Camera Session if you are capturing image from camera
                        self.cameraSession.stopRunning()

                        let someParam   = ""
                        let someParam2  = ""


                        let date = Date()
                        let dateString = "\(date)"



                        Alamofire.upload(multipartFormData: { (multipartFormData) in

                        // Add parameters in request 

         multipartFormData.append(cameraFileName.data(using: .utf8)!, withName: "name")

         multipartFormData.append(dateString.data(using: .utf8)!, withName: "startDatetime")

         multipartFormData.append(someParam.data(using: .utf8)!, withName: "userId")

         multipartFormData.append(someParam2.data(using: .utf8)!, withName: "phoneServiceId")

         multipartFormData.append(fileUrl, withName: "file")

                        }, to:"Your_Api_Url.com") // POST Url
                        { (result) in
                            switch result {
                            case .success(let upload, _ , _):

                                upload.uploadProgress(closure: { (progress) in

                                    print("uploding")
                                })

                                upload.responseJSON { response in
                                    print(response)
                                    print("done")






                                }

                            case .failure(let encodingError):
                                print("failed")
                                print(encodingError)

                            }
                        }

                    }

                }
                catch let error as NSError {
                    print("Ooops! Something went wrong: \(error)")
                }

}

有人能暗示我们走向正确的方向吗？那太棒了:)。

谢谢！

Answer 1

就像他们说的那样，您需要先绘制位图，然后在其上绘制抗锯齿圆。在生成的图像中，非抗锯齿位图绘制在圆上。