rimworld-animation-studio/Assets/Scripts/Graphics/SingleGraphic.cs

using System;
using System.IO;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Serialization;
using UnityEngine;

namespace RimWorldAnimationStudio
{
    [Serializable]
    public class SingleGraphic
    {
        public string path;
        [XmlIgnore] public Sprite sprite = null;

        public void SetPath(string path)
        {
            string streamingAssets = Path.GetFullPath(Application.streamingAssetsPath);
            string combinedPath = Path.GetFullPath(Path.Combine(streamingAssets, path));

            if (path == null || path.Any() == false || Path.GetExtension(path) != ".png")
            { this.path = null; return; }

            if (File.Exists(path) == false && File.Exists(combinedPath) == false)
            { this.path = null; return; }

            if (path.Contains(streamingAssets))
            {
                path = path.Replace(streamingAssets, "");
                path = path.TrimStart(new char[] { '\\', '/' });
            }

            this.path = path;          
            sprite = LoadSprite(Path.GetFullPath(Path.Combine(streamingAssets, path)));
        }

        public Sprite LoadSprite(string path)
        {
            if (path == null || path.Any() == false || File.Exists(path) == false || Path.GetExtension(path) != ".png") return null;

            byte[] pngBytes = File.ReadAllBytes(path);

            Texture2D texture = new Texture2D(2, 2);
            texture.LoadImage(pngBytes);

            float scale = Mathf.Min(texture.width, texture.height) / 128f;

            Sprite sprite = Sprite.Create(texture, new Rect(0.0f, 0.0f, texture.width, texture.height), new Vector2(0.5f, 0.5f), 85.0f * scale);

            return sprite;
        }
    }
}