fl3.go

package main

import (
    "image"
    "sync"
)

var imageCache = sync.Map{}

func getImage(path string) image.Image {
    if img, ok := imageCache.Load(path); ok {
        return img.(image.Image)
    }
    img := loadImage(path)
    imageCache.Store(path, img)
    return img
}

func loadImage(path string) image.Image {
    // ...
}