using UnityEngine;
using System.IO;
using System.Collections.Generic;
using System.Threading.Tasks;

public class BatchTrimAndSaveImages : MonoBehaviour
{

    public Texture2D[] textures;
    public string outputPath = "Assets/OutputImages";

    private void Start()
    {
        CropTextures();
    }
    void CropTextures()
    {
        if (textures == null || textures.Length == 0) return;

        foreach (var texture in textures)
        {
            var originalWidth = texture.width;
            var originalHeight = texture.height;

            // 确保宽度和高度是裁切后尺寸的整数倍
            var width = Mathf.ClosestPowerOfTwo(originalWidth);
            var height = Mathf.ClosestPowerOfTwo(originalHeight);

            // 创建一个新的Texture2D，并裁剪原始纹理
            var croppedTexture = new Texture2D(width, height);
            for (var y = 0; y < height; y++)
            {
                for (var x = 0; x < width; x++)
                {
                    var color = texture.GetPixel((int)(x * (originalWidth / (float)width)), (int)(y * (originalHeight / (float)height)));
                    croppedTexture.SetPixel(x, y, color);
                }
            }

            // 应用所有设置的像素
            croppedTexture.Apply();

            // 保存裁剪后的纹理
            var pngData = croppedTexture.EncodeToPNG();
            File.WriteAllBytes(Path.Combine(outputPath, texture.name + ".png"), pngData);

            // 清理内存
            DestroyImmediate(croppedTexture);
        }
    }
}