Sprite Packer图集导出工具

Sprite Packer只能预览，没法拿到图集图片

菜单栏 -> Window -> 2D -> Sprite Packer

下面的工具可以将图集导出

#if UNITY_EDITOR

using UnityEditor;
using UnityEditor.Sprites;
using UnityEngine;
using System.IO;

public class AtlasExportTool
{
    [MenuItem("MyTools/PackSpritesAndExport Select Atlas", true)]
    static bool PackSpritesAndExportSelectAtlasValidate()
    {
        return null != Selection.activeObject;
    }

    [MenuItem("MyTools/PackSpritesAndExport Select Atlas")]
    static void PackSpritesAndExportSelectAtlas()
    {
        if (null == Selection.activeObject) return;
        if (Application.isPlaying) return;

        var assetPath = AssetDatabase.GetAssetPath(Selection.activeObject);
        var imp = AssetImporter.GetAtPath(assetPath) as TextureImporter;
        if (null == imp || TextureImporterType.Sprite != imp.textureType)
        {
            Debug.Log($"所选资源不是Sprite");
            return;
        }

        if (string.IsNullOrEmpty(imp.spritePackingTag))
        {
            Debug.Log($"所选Sprite没有Packting Tag");
            return;
        }

        string outDirPath = "_AtlasTemp";
        if (!Directory.Exists(outDirPath))
        {
            Directory.CreateDirectory(outDirPath);
        }

        EditorUtility.DisplayProgressBar("RebuildAtlasCacheIfNeeded...", "RebuildAtlasCacheIfNeeded...", 0);
        Packer.RebuildAtlasCacheIfNeeded(EditorUserBuildSettings.activeBuildTarget, true, Packer.Execution.ForceRegroup);
        EditorUtility.ClearProgressBar();

        Debug.Log($"atlasName: {imp.spritePackingTag}");
        var textures = Packer.GetTexturesForAtlas(imp.spritePackingTag);
        ExportTextures(outDirPath, textures);

        var alphaTextures = Packer.GetAlphaTexturesForAtlas(imp.spritePackingTag);
        ExportTextures(outDirPath, alphaTextures);

        Debug.Log($"finish");
    }


    [MenuItem("MyTools/PackSpritesAndExport All Atlas")]
    static void PackSpritesAndExportAtlas()
    {
        if (Application.isPlaying) return;

        string outDirPath = "_AtlasTemp";
        if (!Directory.Exists(outDirPath))
        {
            Directory.CreateDirectory(outDirPath);
        }

        EditorUtility.DisplayProgressBar("RebuildAtlasCacheIfNeeded...", "RebuildAtlasCacheIfNeeded...", 0);
        Packer.RebuildAtlasCacheIfNeeded(EditorUserBuildSettings.activeBuildTarget, true, Packer.Execution.ForceRegroup);
        EditorUtility.ClearProgressBar();

        foreach (var atlasName in Packer.atlasNames)
        {
            Debug.Log($"atlasName: {atlasName}");
            var textures = Packer.GetTexturesForAtlas(atlasName);
            ExportTextures(outDirPath, textures);

            var alphaTextures = Packer.GetAlphaTexturesForAtlas(atlasName);
            ExportTextures(outDirPath, alphaTextures);
        }

        Debug.Log($"finish");
    }

    static void ExportTextures(string outDirPath, Texture[] textures)
    {
        for (int i = 0; i < textures.Length; i++)
        {
            var tex = textures[i];

            var tempRT = RenderTexture.GetTemporary(tex.width, tex.height, 0, RenderTextureFormat.ARGB32);
            Graphics.SetRenderTarget(tempRT);
            Graphics.Blit(tex, tempRT);

            var resultTex = new Texture2D(tex.width, tex.height, TextureFormat.RGBA32, false);
            resultTex.ReadPixels(new Rect(0, 0, tex.width, tex.height), 0, 0);
            resultTex.Apply();

            var bytes = resultTex.EncodeToPNG();

            Graphics.SetRenderTarget(null);
            RenderTexture.ReleaseTemporary(tempRT);

            //var bytes = tex.EncodeToPNG();

            var resultFilePath = "";
            if (1 == textures.Length)
                resultFilePath = Path.Combine(outDirPath, $"{tex.name}.png");
            else
                resultFilePath = Path.Combine(outDirPath, $"{tex.name}-Page{i}.png");

            File.WriteAllBytes(resultFilePath, bytes);
        }
    }

}

#endif

导出的图集