unity获取Texture2D的原始大小

unity设置后的大小

image.png

原始大小

大小

使用 System.Drawing.Image.FromFile获取原始图片，还需要 System.Drawing的DLL库文件，放到Plugins文件夹下面，代码如下：

using System.Collections.Generic;
using UnityEngine;
using System.Drawing;
using System.IO;
using System.Reflection;
using UnityEditor;
using UnityEngine.UI;
public class DefaultSize
{

    // 选中任意张图片单机右键
    [MenuItem("Assets/获取size")]
    static void GetSize()
    {
        UnityEngine.Object[] files = Selection.objects;
        bool isHave = false;
        for (int i = 0; i < files.Length; i++)
        {
            if (files[i] is Texture2D)
            {
                Texture2D tex = files[i] as Texture2D;
                string filePath = AssetDatabase.GetAssetPath(tex);
                // 第一种方式
                var cIma = System.Drawing.Image.FromFile(filePath);
                Debug.LogError("原始大小：" + cIma.Width + "  " + cIma.Height);
                Debug.LogError("当前大小：" + tex.width + "  " + tex.height);
                  // 第二种方式
                TextureImporter textureImporter = AssetImporter.GetAtPath(filePath) as TextureImporter;
                int width = 0;
                int height = 0;
                GetTextureOriginalSize(textureImporter, out width, out height);
                Debug.LogError(width + "：" + height);
            }
        }
    }
    public static void GetTextureOriginalSize(TextureImporter ti, out int width, out int height)
    {
        if (ti == null)
        {
            width = 0;
            height = 0;
            return;
        }

        object[] args = new object[2] { 0, 0 };
        MethodInfo mi = typeof(TextureImporter).GetMethod("GetWidthAndHeight", BindingFlags.NonPublic | BindingFlags.Instance);
        mi.Invoke(ti, args);

        width = (int)args[0];
        height = (int)args[1];
    }


}