[Unity3D] 5.0 图集合并扩展工具，用于解决UGUI与AssetBundle打包造成资源包过大的问题

UGUI Image已Sprite为主，而简单的合并图集可以使用自带的SpritePacker。

而当在使用AssetBundle的时候情况有些不同，会造成每个AB都会引入完整的Sprite图集，显然就增加了AB的大小，重复资源。

为了解决这个问题我们可以手动合并图集，那么方案也有多种，这里我们可以编辑器自带的API来实现一个小的图集合并工具。


private static bool CombineSpritesHelper(string path, string dpath, string name, int padding)


{


string[] paths = AssetDatabase.FindAssets("t:sprite", new string[] { path });


List<Sprite> spriteList = new List<Sprite>();


List<Texture2D> texList = new List<Texture2D>();




foreach (var o in paths)


{


Sprite s = AssetDatabase.LoadAssetAtPath(AssetDatabase.GUIDToAssetPath(o), typeof(Sprite)) as Sprite;


if (null != s)


{


spriteList.Add(s);


texList.Add(s.texture);


}


}




if (texList.Count > 0)


{


Texture2D tex = new Texture2D(1024, 1024, TextureFormat.ARGB32, true);


Rect[] uvs = UITexturePacker.PackTextures(tex, texList.ToArray(), 4, 4, padding, 1024);


if (null == uvs)


{


EditorUtility.DisplayDialog(path, "图集超过1024，需要分组成多张图集", "点击退出");


Object.DestroyImmediate(tex);


tex = null;


return false;


}


else


{


List<SpriteMetaData> metaList = new List<SpriteMetaData>();


for (int i = 0; i < uvs.Length; ++i)


{


SpriteMetaData data = new SpriteMetaData();


data.alignment = (int)SpriteAlignment.Center;


data.border = spriteList[i].border;


data.name = spriteList[i].name;


data.pivot = spriteList[i].pivot;


data.rect = new Rect(uvs[i].x * tex.width, uvs[i].y * tex.height, uvs[i].width * tex.width, uvs[i].height * tex.height);


metaList.Add(data);


}




//string dpath = path.Substring(0, path.Length - obj.name.Length) + "SpriteSet";


if (!System.IO.Directory.Exists(dpath))


{


System.IO.Directory.CreateDirectory(dpath);


}




string file = dpath + "/" + name + ".png";


if (System.IO.File.Exists(file))


{


System.IO.File.Delete(file);


}


System.IO.File.WriteAllBytes(file, tex.EncodeToPNG());




AssetDatabase.ImportAsset(file, ImportAssetOptions.ForceUpdate);


TextureImporter importer = AssetImporter.GetAtPath(file) as TextureImporter;


importer.spritesheet = metaList.ToArray();


importer.spriteImportMode = SpriteImportMode.Multiple;


importer.textureType = TextureImporterType.Sprite;


importer.textureFormat = TextureImporterFormat.ARGB32;


importer.mipmapEnabled = true;


importer.mipmapFilter = TextureImporterMipFilter.BoxFilter;


importer.assetBundleName = "ui_image/" + name.ToLower();


AssetDatabase.ImportAsset(file);


AssetDatabase.Refresh();


}


}


return true;


}




[MenuItem("Tool/Combine Sprites")]


[MenuItem("Assets/Tool/Combine Sprites")]


public static void CombineSprites()


{


EditorUtility.DisplayProgressBar("Combine Sprites", "Initializing

", 0);


try


{


Object obj = Selection.activeObject;


string path = AssetDatabase.GetAssetPath(obj.GetInstanceID());


string dpath = path.Substring(0, path.Length - obj.name.Length) + "SpriteSet";




if (System.IO.Directory.Exists(path))


{


string[] directories = System.IO.Directory.GetDirectories(path);


int count = 0;


if (directories.Length > 0)


{


foreach (var directory in directories)


{


count++;


EditorUtility.DisplayProgressBar("Combine Sprites", string.Format("combing

{0}", count), (float)(count) / (directories.Length));


if (!CombineSpritesHelper(directory, dpath, string.Concat(obj.name, "_", count.ToString()), 1))


{


break;


}


}


}


else


{


EditorUtility.DisplayProgressBar("Combine Sprites", "combing

0", 1);


CombineSpritesHelper(path, dpath, obj.name, 1);


}


}


}


catch (System.Exception e)


{


Debug.LogError(e);


}


EditorUtility.ClearProgressBar();


}

使用方法很简单，可以修改源码中的路径，可以将多个Single Sprite合成一个Multi Sprite。然后在供，UGUI使用，注意最好保存好合并前的源文件，不然可能造成新增图片打图集后对应不上从而造成引用丢失。