golang怎么翻转图片

import (
    "image"
    "image/color"
)

func flipImage(originalImage image.Image, direction string) image.Image {

    // Get the dimensions of the original image
    width := originalImage.Bounds().Size().X
    height := originalImage.Bounds().Size().Y
    
    // Create a new image with the same size as the original image
    newImage := image.NewRGBA(originalImage.Bounds())
    
    // Loop through every pixel in the new image
    for x := 0; x < width; x++ {
        for y := 0; y < height; y++ {
            
            // Calculate the new x,y position based on the flip direction
            newX := x
            newY := y
            if direction == "horizontal" {
                newX = width - x - 1
            } else {
                newY = height - y - 1
            }
            
            // Get the color of the pixel at the original x,y position
            originalPixel := originalImage.At(x, y)
            r, g, b, a := originalPixel.RGBA()
            
            // Set the color of the pixel at the new x,y position in the new image
            newImage.Set(newX, newY, color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)})
        }
    }
    
    // Return the new image
    return newImage
}

package main

import (
    "fmt"
    "image/jpeg"
    "os"
)

func main() {
    // Open the image file
    file, err := os.Open("original.jpg")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer file.Close()

    // Decode the image file
    originalImage, err := jpeg.Decode(file)
    if err != nil {
        fmt.Println(err)
        return
    }

    // Flip the image horizontally
    flippedImage := flipImage(originalImage, "horizontal")

    // Save the flipped image to a new file
    newFile, err := os.Create("flipped.jpg")
    if err != nil {
        fmt.Println(err)
        return
    }
    defer newFile.Close()

    jpeg.Encode(newFile, flippedImage, &jpeg.Options{Quality: 100})
}