Initial Create

基础框架实现

Jetson Media/ui/UIImage.swift

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+import UIKit
+
+extension UIImage {
+    func decodeImage(num: Int) -> UIImage {
+        guard let decodedImage = decodeImage2(num: num) else {
+            print("解密失败，返回原图")
+            return self
+        }
+        
+        // 将解密后的图片进行上下翻转
+        // 2. 上下翻转图片
+        //let flippedImage = decodedImage.flipVertically()
+               
+               // 3. 左右镜像图片
+        let mirroredImage = decodedImage.wrongFlipHorizontally().correctFlipHorizontally()
+        return mirroredImage
+    }
+    // 当前错误的水平翻转（保持原样）
+    private func wrongFlipHorizontally() -> UIImage {
+        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
+        defer { UIGraphicsEndImageContext() }
+        
+        guard let context = UIGraphicsGetCurrentContext(),
+              let cgImage = self.cgImage else {
+            print("镜像失败：无法获取 CGImage")
+            return self
+        }
+        
+        // 当前错误的翻转逻辑（实际会产生垂直翻转效果）
+        context.translateBy(x: self.size.width, y: 0)
+        context.scaleBy(x: -1.0, y: 1.0)
+        
+        context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
+        
+        return UIGraphicsGetImageFromCurrentImageContext() ?? self
+    }
+    
+    // 新增：正确的水平翻转方法
+    private func correctFlipHorizontally() -> UIImage {
+        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
+        defer { UIGraphicsEndImageContext() }
+        
+        guard let context = UIGraphicsGetCurrentContext(),
+              let cgImage = self.cgImage else {
+            print("镜像失败：无法获取 CGImage")
+            return self
+        }
+        
+        // 正确的水平翻转逻辑
+        context.translateBy(x: self.size.width, y: self.size.height)
+        context.scaleBy(x: -1.0, y: -1.0)  // 只翻转x轴
+        
+        context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
+        
+        return UIGraphicsGetImageFromCurrentImageContext() ?? self
+    }
+    // 解密图片逻辑（与之前一致）
+    private func decodeImage2(num: Int) -> UIImage? {
+        guard num > 0 else {
+            print("解密跳过：num 参数为 0，直接返回原图")
+            return self
+        }
+        
+        let width = Int(self.size.width * self.scale)
+        let height = Int(self.size.height * self.scale)
+        let totalHeight = height // 总高度为整数
+        let totalWidth = width
+        
+        UIGraphicsBeginImageContextWithOptions(CGSize(width: totalWidth, height: totalHeight), false, self.scale)
+        defer { UIGraphicsEndImageContext() }
+        
+        guard let context = UIGraphicsGetCurrentContext(),
+              let cgImage = self.cgImage else {
+            print("解密失败：无法创建图形上下文或获取 CGImage")
+            return nil
+        }
+        
+        let segmentHeight = totalHeight / num // 每段高度
+        let remainder = totalHeight % num     // 余数
+        
+        print("图片总高度: \(totalHeight)，每段高度: \(segmentHeight)，余数: \(remainder)")
+        
+        for i in 0..<num {
+            var currentSegmentHeight = segmentHeight
+            let ySrc = segmentHeight * i // 从顶部开始裁剪
+            var yDst = segmentHeight * i // 从顶部开始绘制
+            
+            if i == 0 {
+                currentSegmentHeight += remainder // 第一段包含余数
+            }
+            
+            let srcRect = CGRect(
+                x: 0,
+                y: CGFloat(ySrc),
+                width: CGFloat(totalWidth),
+                height: CGFloat(currentSegmentHeight)
+            )
+            
+            let dstRect = CGRect(
+                x: 0,
+                y: CGFloat(yDst),
+                width: CGFloat(totalWidth),
+                height: CGFloat(currentSegmentHeight)
+            )
+            
+            print("段 \(i): 源矩形: \(srcRect)，目标矩形: \(dstRect)")
+            
+            if let croppedImage = cgImage.cropping(to: srcRect) {
+                context.draw(croppedImage, in: dstRect)
+            } else {
+                print("段 \(i): 裁剪失败")
+            }
+        }
+        
+        return UIGraphicsGetImageFromCurrentImageContext()
+    }
+    
+    // 上下翻转图片逻辑
+    private func flipVertically() -> UIImage {
+        UIGraphicsBeginImageContextWithOptions(self.size, false, self.scale)
+        defer { UIGraphicsEndImageContext() }
+        
+        guard let context = UIGraphicsGetCurrentContext(),
+              let cgImage = self.cgImage else {
+            print("翻转失败：无法获取 CGImage")
+            return self
+        }
+        
+        // 翻转坐标系
+        context.translateBy(x: 0, y: self.size.height)
+        context.scaleBy(x: 1.0, y: -1.0)
+        
+        // 绘制翻转后的图片
+        context.draw(cgImage, in: CGRect(origin: .zero, size: self.size))
+        
+        return UIGraphicsGetImageFromCurrentImageContext() ?? self
+    }
+}