static public void PackTexture(List <TextureImporter> imps, string atlasName, string atlasPath, string texturePath)
{
if (imps == null || imps.Count <= 0)
{
Debug.Log("选择打包的小图数量为0");
return;
}
//检查文件夹是否存在
if (!Directory.Exists(atlasPath))
{
Directory.CreateDirectory(atlasPath);
}
//检查文件夹是否存在
if (!Directory.Exists(texturePath))
{
Directory.CreateDirectory(texturePath);
}
//图集预制相对路径
string relativePath = atlasPath + atlasName + ".prefab";
//图集预制绝对路径
//string absolutePath = Path.GetFullPath(atlasPath) + atlasName + ".png";
//纹理相对路径
string relativeTexPath = texturePath + atlasName + ".png";
//纹理绝对路径
string absoluteTexPath = Path.GetFullPath(texturePath) + atlasName + ".png";
//判断图片格式不对了，先进性格式的转换
CheckFormat(imps);
//加载图片资源
Texture2D[] texs = LoadTextures(imps);
//创建Atlas实例
UIAtlas atlasInfo = ScriptableObject.CreateInstance <UIAtlas>();
atlasInfo.name = atlasName;
//打包小图到大纹理并返回uv信息
Texture2D atlasTexture = new Texture2D(1, 1);
Rect[] rs = atlasTexture.PackTextures(texs, (int)padding, (int)matAtlasSize);
//把图集写入到磁盘文件
File.WriteAllBytes(absoluteTexPath, atlasTexture.EncodeToPNG());
//刷新图片
AssetDatabase.Refresh();
AssetDatabase.ImportAsset(relativeTexPath);
//记录图片的名字，只是用于输出日志用;
StringBuilder names = new StringBuilder();
//SpriteMetaData结构可以让我们编辑图片的一些信息,想图片的name,包围盒border,在图集中的区域rect等
SpriteMetaData[] sheet = new SpriteMetaData[rs.Length];
for (var i = 0; i < sheet.Length; i++)
{
SpriteMetaData meta = new SpriteMetaData();
meta.name = texs[i].name;
//这里的rect记录的是单个图片在图集中的uv坐标值
meta.rect = rs[i];
meta.rect.Set(
meta.rect.x * atlasTexture.width,
meta.rect.y * atlasTexture.height,
meta.rect.width * atlasTexture.width,
meta.rect.height * atlasTexture.height
);
TextureImporter texImp = imps[i];
//如果图片有包围盒信息的话
if (texImp != null)
{
meta.border = texImp.spriteBorder;
meta.pivot = texImp.spritePivot;
}
sheet[i] = meta;
SpriteData sd = new SpriteData();
sd.name = meta.name;
sd.alignment = meta.alignment;
sd.border = new Vector4(meta.border.x, meta.border.y, meta.border.z, meta.border.w);
sd.pivot = new Vector2(meta.pivot.x, meta.pivot.y);
sd.rect = new Rect(meta.rect);
if (!atlasInfo.HasSpriteData(meta.name))
{
atlasInfo._uvs.Add(sd);
}
else
{
Debug.LogErrorFormat("{0}图集中存在相同名称的图片：{1}", atlasInfo.name, meta.name);
}
//打印日志用
names.Append(meta.name);
if (i < sheet.Length - 1)
{
names.Append(",");
}
}
//设置图集纹理信息
TextureImporter imp = TextureImporter.GetAtPath(relativeTexPath) as TextureImporter;
imp.textureType = TextureImporterType.Sprite;//图集的类型
imp.textureCompression = TextureImporterCompression.Uncompressed;
imp.alphaIsTransparency = true;
//imp.SetPlatformTextureSettings("iPhone", 2048, TextureImporterFormat.AutomaticTruecolor);
imp.SetPlatformTextureSettings("Android", 2048, TextureImporterFormat.ETC2_RGBA8);
imp.ClearPlatformTextureSettings("iPhone");
imp.textureFormat = TextureImporterFormat.AutomaticTruecolor; //TextureImporterFormat.AutomaticCompressed;//图集的格式
imp.spriteImportMode = SpriteImportMode.Multiple; //Multiple表示我们这个大图片(图集)中包含很多小图片
imp.mipmapEnabled = false; //是否开启mipmap
imp.isReadable = false;
imp.spritesheet = sheet; //设置图集中小图片的信息(每个图片所在的区域rect等)
// 保存并刷新
imp.SaveAndReimport();
//重新加载导出的纹理
Texture2D texture2d = AssetDatabase.LoadAssetAtPath <Texture2D>(relativeTexPath);
//填充图集信息
atlasInfo._tex2d = texture2d;
AssetDatabase.CreateAsset(atlasInfo, relativePath);
GameObject.DestroyImmediate(atlasInfo);
//输出日志
Debug.Log("Atlas create ok. " + names.ToString());
}
