特效处理
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using UnityEditor;
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using UnityEngine;
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using UnityEngine.U2D;
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/// <summary>
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/// 图片 maxTextureSize 批量设置工具（按原图尺寸智能降分辨率）。
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///
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/// 【用途】
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/// UI 图片常超采样（2048 的图实际显示只需 1200 左右），批量把 TextureImporter 的
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/// maxTextureSize 降到合适档位，减小包体与内存。规则：
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/// 目标缩放比例控制在原图的 60%~80%：
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/// - 在 [60%, 80%] 区间内取 2 的幂档位（32/64/.../4096），取区间内满足 ≥60% 的最小档位（最省内存）；
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/// - 区间内没有档位时，取 ≥60% 的最小档位（硬保清晰度下限，允许略超 80%）；
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/// - 档位 ≥ 原图边长（缩放后无变化）→ 不修改。
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///
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/// 【使用】
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/// 1. Project 选中一个/多个文件夹或图片（文件夹会递归）
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/// 2. 菜单 Tools → 图片尺寸工具 → [扫描选中对象]
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/// 3. 检查列表（新 maxSize、实际缩放比、预计内存节省），可逐行勾选
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/// 4. [应用勾选项] 批量写入 TextureImporter 并重导入
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///
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/// 【注意】
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/// - 已被 SpriteAtlas 收录的图会标注并默认跳过（图集的平台设置优先，单图 maxSize 无效）
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/// - 只处理 TextureImporter（Sprite / Default / GUI 类型），NormalMap 等自动跳过
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/// </summary>
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public class TextureMaxSizeWindow : EditorWindow
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{
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[MenuItem("Tools/图片尺寸工具")]
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public static void Open()
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{
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var w = GetWindow<TextureMaxSizeWindow>("图片尺寸工具");
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w.minSize = new Vector2(640f, 560f);
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}
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private class ItemInfo
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{
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public string path;
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public int w, h;
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public int curMax;
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public int newMax;
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public float scale; // 实际缩放比例（1=不缩）
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public bool inAtlas; // 已被 SpriteAtlas 收录
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public bool selected = true;
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public long savedBytes; // 预计内存节省（RGBA32 估算）
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}
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private readonly List<ItemInfo> _items = new List<ItemInfo>();
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private HashSet<string> _atlasPaths; // 所有图集收录的资源路径
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private Vector2 _scroll;
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private bool _skipSmall = true; // 跳过边长≤128 的小图
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private bool _skipInAtlas = true; // 跳过已被图集收录的
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private bool _onlyShrunk = true; // 只显示会实际缩小的
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private void OnGUI()
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{
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EditorGUILayout.HelpBox(
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"按原图尺寸智能设置 maxTextureSize：缩放控制在原图的 60%~80%，\n" +
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"取区间内 ≥60% 的最小 2 的幂档位（区间无档位时取 ≥60% 最小档位，保清晰度优先）。\n" +
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"选中 Project 里的文件夹或图片后点扫描。", MessageType.Info);
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if (GUILayout.Button("扫描选中对象（文件夹/图片）", GUILayout.Height(30)))
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Scan();
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_skipSmall = EditorGUILayout.ToggleLeft("跳过小图（最长边 ≤ 128）", _skipSmall);
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_skipInAtlas = EditorGUILayout.ToggleLeft("跳过已被 SpriteAtlas 收录的图（图集设置优先）", _skipInAtlas);
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_onlyShrunk = EditorGUILayout.ToggleLeft("只显示会实际缩小的图", _onlyShrunk);
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EditorGUILayout.Space(4);
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var visible = VisibleItems().ToList();
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if (visible.Count > 0)
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{
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long totalSaved = visible.Where(i => i.selected).Sum(i => i.savedBytes);
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EditorGUILayout.LabelField(
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$"共 {visible.Count} 项 | 勾选 {visible.Count(i => i.selected)} 项 | 预计节省内存 ~{totalSaved / 1048576f:F1} MB（RGBA32 估算）",
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EditorStyles.boldLabel);
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EditorGUILayout.BeginHorizontal();
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if (GUILayout.Button("全选")) visible.ForEach(i => i.selected = true);
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if (GUILayout.Button("全不选")) visible.ForEach(i => i.selected = false);
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EditorGUILayout.EndHorizontal();
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_scroll = EditorGUILayout.BeginScrollView(_scroll, GUILayout.MinHeight(220));
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foreach (var it in visible)
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{
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EditorGUILayout.BeginHorizontal();
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it.selected = EditorGUILayout.Toggle(it.selected, GUILayout.Width(20));
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string tag = it.inAtlas ? "[图集内]" : "";
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string change = it.newMax != it.curMax ? $"{it.curMax} → {it.newMax}" : $"{it.curMax}(已是目标)";
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GUILayout.Label($"{it.w}×{it.h} max: {change} 缩至 {it.scale:P0} {tag}", GUILayout.Width(330));
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GUILayout.Label(it.path, EditorStyles.miniLabel);
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EditorGUILayout.EndHorizontal();
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}
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EditorGUILayout.EndScrollView();
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using (new EditorGUI.DisabledScope(!visible.Any(i => i.selected)))
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{
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if (GUILayout.Button("应用勾选项", GUILayout.Height(34)))
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Apply(visible.Where(i => i.selected).ToList());
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}
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}
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else
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{
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EditorGUILayout.HelpBox("尚未扫描，或按当前过滤条件没有需要处理的图片", MessageType.None);
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}
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}
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private IEnumerable<ItemInfo> VisibleItems()
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{
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foreach (var it in _items)
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{
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if (_skipSmall && Mathf.Max(it.w, it.h) <= 128) continue;
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if (_skipInAtlas && it.inAtlas) continue;
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if (_onlyShrunk && it.newMax >= Mathf.Max(it.w, it.h)) continue;
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yield return it;
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}
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}
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/// <summary>扫描选中对象（文件夹递归 / 单张图片），收集贴图并计算目标 maxSize</summary>
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private void Scan()
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{
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_items.Clear();
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_atlasPaths = CollectAtlasPaths();
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var paths = new HashSet<string>();
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foreach (var obj in Selection.objects)
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{
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string p = AssetDatabase.GetAssetPath(obj);
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if (string.IsNullOrEmpty(p)) continue;
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if (Directory.Exists(p))
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{
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foreach (var guid in AssetDatabase.FindAssets("t:Texture2D", new[] { p }))
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paths.Add(AssetDatabase.GUIDToAssetPath(guid));
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}
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else if (p.EndsWith(".png") || p.EndsWith(".jpg") || p.EndsWith(".jpeg") || p.EndsWith(".tga"))
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{
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paths.Add(p);
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}
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}
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foreach (var path in paths.OrderBy(p => p))
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{
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var importer = AssetImporter.GetAtPath(path) as TextureImporter;
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if (importer == null) continue;
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// 只处理常规贴图类型（NormalMap 等跳过）
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if (importer.textureType == TextureImporterType.NormalMap) continue;
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var tex = AssetDatabase.LoadAssetAtPath<Texture2D>(path);
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if (tex == null) continue;
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int side = Mathf.Max(tex.width, tex.height);
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int newMax = ComputeMaxSize(side);
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// maxSize 只在小于原边长时才实际缩放
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float scale = newMax < side ? (float)newMax / side : 1f;
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long cur = (long)tex.width * tex.height * 4;
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long after = (long)(tex.width * scale) * (long)(tex.height * scale) * 4;
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_items.Add(new ItemInfo
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{
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path = path,
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w = tex.width,
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h = tex.height,
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curMax = importer.maxTextureSize,
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newMax = newMax,
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scale = scale,
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inAtlas = _atlasPaths.Contains(path),
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savedBytes = cur - after
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});
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}
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ShowNotification(new GUIContent($"扫描到 {_items.Count} 张贴图"));
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}
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/// <summary>
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/// 计算目标 maxTextureSize：
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/// 取 ≥ 原边长 60% 的最小 2 的幂档位（32~4096）。
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/// 若该档位落在 [60%,80%] 区间内则同时满足上限约束；
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/// 区间内无档位时允许略超 80%（清晰度 60% 是硬下限）。
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/// </summary>
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private static int ComputeMaxSize(int side)
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{
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int lower = Mathf.CeilToInt(side * 0.6f);
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int pow = 32;
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while (pow < lower && pow < 4096) pow <<= 1;
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return Mathf.Clamp(pow, 32, 4096);
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}
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/// <summary>收集所有 SpriteAtlas（含其 packable 文件夹展开）覆盖的资源路径。
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/// 该版本 SpriteAtlas 的 packables 无公开读取 API，用 SerializedObject 读 m_EditorData.packables。</summary>
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private static HashSet<string> CollectAtlasPaths()
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{
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var set = new HashSet<string>();
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foreach (var guid in AssetDatabase.FindAssets("t:SpriteAtlas"))
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{
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var atlasPath = AssetDatabase.GUIDToAssetPath(guid);
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var atlas = AssetDatabase.LoadAssetAtPath<SpriteAtlas>(atlasPath);
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if (atlas == null) continue;
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var so = new SerializedObject(atlas);
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var packables = so.FindProperty("m_EditorData.packables");
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if (packables == null || !packables.isArray) continue;
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for (int i = 0; i < packables.arraySize; i++)
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{
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var packable = packables.GetArrayElementAtIndex(i).objectReferenceValue;
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if (packable == null) continue;
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string p = AssetDatabase.GetAssetPath(packable);
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if (string.IsNullOrEmpty(p)) continue;
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if (Directory.Exists(p))
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{
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foreach (var g in AssetDatabase.FindAssets("t:Texture2D", new[] { p }))
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set.Add(AssetDatabase.GUIDToAssetPath(g));
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}
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else
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set.Add(p);
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}
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}
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return set;
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}
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/// <summary>批量写入 maxTextureSize 并重导入</summary>
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private void Apply(List<ItemInfo> targets)
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{
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try
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{
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int done = 0;
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foreach (var it in targets)
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{
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EditorUtility.DisplayProgressBar("应用 maxSize", it.path, (float)done / targets.Count);
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var importer = AssetImporter.GetAtPath(it.path) as TextureImporter;
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if (importer != null && importer.maxTextureSize != it.newMax)
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{
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importer.maxTextureSize = it.newMax;
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importer.SaveAndReimport();
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}
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done++;
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}
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}
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finally
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{
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EditorUtility.ClearProgressBar();
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}
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Debug.Log($"[图片尺寸工具] 已应用 {targets.Count} 项 maxTextureSize");
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// 重新扫描刷新列表（当前值已变化）
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Scan();
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}
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}
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