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圖集打包Atlas

制作

NGUI是必須先打出圖集然后才能開始做界面。因為始終都要去考慮你的UI圖集。比如圖集會不會超1024 ，圖集該如何來規劃等等。

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UGUI 讓開發者徹底模糊圖集的概念，讓開發者不要去關心自己的圖集。做界面的時候只用小圖，而在最終打包的時候unity才會把你的小圖和并在一張大的圖集里面。然而這一切都是自動完成的，開發者不需要去care它。

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NGUI在打包圖集的時候圖集的默認格式是RGBA32，也就是支持帶透明通道的圖片，這樣一張1024的圖集也就是4M內存。為了優化圖集，我們可以選擇把帶透明通道圖片 和 不帶透明通道的圖片分開打圖集，這樣可以減少內存的占用量。然而著一切的一切在NGUI上都需要手動操作，而SpritePacker則全自動完成。Sprite上的Packing Tag 同一標識的圖片。

UGUI會把相同圖片格式的圖片打包成同一圖集。MomoAtals和RUORUOAtlas就是Packing Tag的標識符，那么此時根據這兩個標識符SpritePacker將打出兩個圖集出來。 因為MomoAtlas這些圖片中，一部分是RGBA32格式，還有一部分是ETC 4bits格式，那么MomoAtlas將被在分成兩個圖集，就是尾綴帶Group的。

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打包Sprite Packer有兩個打包模式

DefaultPackerPolicy：是默認的打包方式，也是矩形打包方式。他會把所有的小圖按照矩形的方式來排列，如果寬高不一樣的圖片，它們會自動補起。

TightPackerPolicy：是緊密打包方式，也就是盡可能的把圖片都打包在圖集上，這種方式要比DefaultPackerPolicy打包的圖片更多一些，也就是更省空間。

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圖中[TIGHT]開頭的就表示單獨這張圖采用TightPackerPolicy打包模式。

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自定義打包

假如我想自定義打包方式咋辦?比如我想設置圖片打包格式，或者圖集大小等等怎么辦？把如下代碼放在Editor文件夾下， 在代碼里面就可以設置圖集的屬性了。

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using System;

using System.Linq;

using UnityEngine;

using UnityEditor;

using UnityEditor.Sprites;

using System.Collections.Generic;

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// DefaultPackerPolicy will pack rectangles no matter what Sprite mesh type is unless their packing tag contains "[TIGHT]".

class DefaultPackerPolicySample : UnityEditor.Sprites.IPackerPolicy

{

????protected class Entry

????{

????????public Sprite????????????sprite;

????????public AtlasSettings???? settings;

????????public string????????????atlasName;

????????public SpritePackingMode packingMode;

????}

????

????public virtual int GetVersion() { return 1; }

????

????protected virtual string TagPrefix { get { return "[TIGHT]"; } }

????protected virtual bool AllowTightWhenTagged { get { return true; } }

????

????public void OnGroupAtlases(BuildTarget target, PackerJob job, int[] textureImporterInstanceIDs)

????{

????????List<Entry> entries = new List<Entry>();

????????

????????foreach (int instanceID in textureImporterInstanceIDs)

????????{

????????????TextureImporter ti = EditorUtility.InstanceIDToObject(instanceID) as TextureImporter;

????????????

????????????TextureImportInstructions ins = new TextureImportInstructions();

????????????ti.ReadTextureImportInstructions(ins, target);

????????????

????????????TextureImporterSettings tis = new TextureImporterSettings();

????????????ti.ReadTextureSettings(tis);

????????????

????????????Sprite[] sprites = AssetDatabase.LoadAllAssetRepresentationsAtPath(ti.assetPath).Select(x => x as Sprite).Where(x => x != null).ToArray();

????????????foreach (Sprite sprite in sprites)

????????????{

????????????????????????????????//在這里設置每個圖集的參數

????????????????Entry entry = new Entry();

????????????????entry.sprite = sprite;

????????????????entry.settings.format = ins.desiredFormat;

????????????????entry.settings.usageMode = ins.usageMode;

????????????????entry.settings.colorSpace = ins.colorSpace;

????????????????entry.settings.compressionQuality = ins.compressionQuality;

????????????????entry.settings.filterMode = Enum.IsDefined(typeof(FilterMode), ti.filterMode) ? ti.filterMode : FilterMode.Bilinear;

????????????????entry.settings.maxWidth = 1024;

????????????????entry.settings.maxHeight = 1024;

????????????????entry.atlasName = ParseAtlasName(ti.spritePackingTag);

????????????????entry.packingMode = GetPackingMode(ti.spritePackingTag, tis.spriteMeshType);

????????????????

????????????????entries.Add(entry);

????????????}

????????????

????????????Resources.UnloadAsset(ti);

????????}

????????

????????// First split sprites into groups based on atlas name

????????var atlasGroups =

????????????from e in entries

????????????????group e by e.atlasName;

????????foreach (var atlasGroup in atlasGroups)

????????{

????????????int page = 0;

????????????// Then split those groups into smaller groups based on texture settings

????????????var settingsGroups =

????????????????from t in atlasGroup

????????????????????group t by t.settings;

????????????foreach (var settingsGroup in settingsGroups)

????????????{

????????????????string atlasName = atlasGroup.Key;

????????????????if (settingsGroups.Count() > 1)

????????????????????atlasName += string.Format(" (Group {0})", page);

????????????????

????????????????job.AddAtlas(atlasName, settingsGroup.Key);

????????????????foreach (Entry entry in settingsGroup)

????????????????{

????????????????????job.AssignToAtlas(atlasName, entry.sprite, entry.packingMode, SpritePackingRotation.None);

????????????????}

????????????????

????????????????++page;

????????????}

????????}

????}

????

????protected bool IsTagPrefixed(string packingTag)

????{

????????packingTag = packingTag.Trim();

????????if (packingTag.Length < TagPrefix.Length)

????????????return false;

????????return (packingTag.Substring(0, TagPrefix.Length) == TagPrefix);

????}

????

????private string ParseAtlasName(string packingTag)

????{

????????string name = packingTag.Trim();

????????if (IsTagPrefixed(name))

????????????name = name.Substring(TagPrefix.Length).Trim();

????????return (name.Length == 0) ? "(unnamed)" : name;

????}

????

????private SpritePackingMode GetPackingMode(string packingTag, SpriteMeshType meshType)

????{

????????if (meshType == SpriteMeshType.Tight)

????????????if (IsTagPrefixed(packingTag) == AllowTightWhenTagged)

????????????????return SpritePackingMode.Tight;

????????return SpritePackingMode.Rectangle;

????}

}

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雖然可以全選在設置圖片的pack tag，但是我覺得最好全自動完成，比如我們把圖片放在不同的文件夾下，那么文件夾的名子就可以用做Atals的名子。最后在分享一條這樣的腳本。

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using UnityEngine; using System.Collections; using UnityEditor; using System.IO; ? ? public class??Post : AssetPostprocessor { ? ? ????void OnPostprocessTexture (Texture2D texture) ????{ ????????string AtlasName =??new DirectoryInfo(Path.GetDirectoryName(assetPath)).Name; ????????TextureImporter textureImporter??= assetImporter as TextureImporter; ????????textureImporter.textureType = TextureImporterType.Sprite; ????????textureImporter.spritePackingTag = AtlasName; ????????textureImporter.mipmapEnabled = false; ????} ? ? }

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