利用Unity自带的合图切割功能将合图切割成子图

 1 using UnityEngine;
 2 using UnityEditor;
 3 using System.Collections.Generic;
 4 using System.IO;
 5 
 6 /// <summary>
 7 /// 可以将Unity里自带的合图切割功能切割后的合图导出为子图
 8 /// 使用方法：
 9 /// 1.先导入Png合图
10 /// 2.图片Texture Type要选择Advanced并且下面那个Read/Wite Enable要打勾
11 /// 3.将图片格式设置为合图“mult”，并点击“Editor”开始切割合图
12 /// 4.切割完毕后先选中该张图片，点击Process to Sprites后便可以导出
13 /// </summary>
14 public static class SpriteSheetPackerImport
15 {
16     [MenuItem("Assets/Sprite Sheet Packer/Process to Sprites")]
17     static void ProcessToSprite()
18     {
19         Texture2D image = Selection.activeObject as Texture2D;                          //获取旋转的对象
20         string rootPath = Path.GetDirectoryName(AssetDatabase.GetAssetPath(image));     //获取路径名称
21         string path = rootPath + "/" + image.name + ".PNG";                             //图片路径名称
22 
23 
24         TextureImporter texImp = AssetImporter.GetAtPath(path) as TextureImporter;
25 
26 
27         AssetDatabase.CreateFolder(rootPath, image.name);                               //创建文件夹
28 
29 
30         foreach (SpriteMetaData metaData in texImp.spritesheet)                         //遍历小图集
31         {
32             Texture2D myimage = new Texture2D((int)metaData.rect.width, (int)metaData.rect.height);
33 
34 
35             //abc_0:(x:2.00, y:400.00, width:103.00, height:112.00)
36             for (int y = (int)metaData.rect.y; y < metaData.rect.y + metaData.rect.height; y++)//Y轴像素
37             {
38                 for (int x = (int)metaData.rect.x; x < metaData.rect.x + metaData.rect.width; x++)
39                     myimage.SetPixel(x - (int)metaData.rect.x, y - (int)metaData.rect.y, image.GetPixel(x, y));
40             }
41 
42 
43             //转换纹理到EncodeToPNG兼容格式
44             if (myimage.format != TextureFormat.ARGB32 && myimage.format != TextureFormat.RGB24)
45             {
46                 Texture2D newTexture = new Texture2D(myimage.width, myimage.height);
47                 newTexture.SetPixels(myimage.GetPixels(0), 0);
48                 myimage = newTexture;
49             }
50             var pngData = myimage.EncodeToPNG();
51 
52 
53             //AssetDatabase.CreateAsset(myimage, rootPath + "/" + image.name + "/" + metaData.name + ".PNG");
54             File.WriteAllBytes(rootPath + "/" + image.name + "/" + metaData.name + ".PNG", pngData);
55         }
56     }
57 }