关于处理ETC2_4的倍数思路+脚本
1：resize_pic.py脚本，这种直接改了原图片的宽+高。python->PIL
import osfrom PIL import Imageimport struct##检查并调整bg图片的宽高，确保宽高都是4的倍数，这样才可以使用ETC压缩格式#''' #遍历目录中的png文件def list_pic(dirpath): print(dirpath) for root, dirs, fs in os.walk(dirpath): for f in fs: if f.endswith('.jpg') or f.endswith('.png'): yield os.path.join(root, f) #获取图片实际尺寸def get_png_size(fpath): with open(fpath, 'rb') as f: f.seek(4*4, 0) return (struct.unpack(">II", f.read(8)) ) def getSize(path): img = Image.open(path) imgSize = img.size#大小/尺寸 w = img.width #图片的宽 h = img.height #图片的高 f = img.format #图像格式 return w,h #列出宽高不是4的倍数的图片 def list_not_4_pic(dirpath): for f in list_pic(dirpath): w,h = getSize(f) print(f+"---"+str(w)+"---"+str(h)) if w%4 != 0 or h%4 != 0: yieldf#调整图片的尺寸，确保宽高是4的倍数 def resize_4_pic(dirpath): with open('resize_4_pic.output.log', 'w') as log: for f in list_not_4_pic(dirpath): img = Image.open(f) (w,h) = img.size nw = (w%4==0) and w or (w + (4-(w%4))) nh = (h%4==0) and h or (h + (4-(h%4))) print( (w, h),'->',(nw,nh), f) log.write("%s | (%d,%d)-> (%d,%d)\n"%(f,w, h,nw,nh)) img = img.resize( (nw,nh), Image.ANTIALIAS) img.save(f) if '__main__' == __name__: resize_4_pic('.')
2：unity编辑器代码处理
using System;using System.Collections.Generic;using System.IO;using System.Text;using UnityEditor;using UnityEngine;public class TextureSizeEditorWindow:EditorWindow{ private int curNumber; private string curFilePath; private PlatformType platformType; private List<string> allTexturePaths = new List<string>(); private List<string> allTextureExtension = new List<string>(); //查找不是4倍数的脚本 public const string ETC2_FILE_PATH = "_CheckETC2Size.log"; private FileStream fs; private string etc2logFullPath; private byte[] writeBytes; private string ignoreDir ="Assets\\Art/Spine_special"; // private List<string> noCheckDir = new List<string> {"Assets\\Main/Atlas", "Assets\\Main/Sprites"}; static void OpenTextureCompressPanel() { TextureSizeEditorWindow window = (TextureSizeEditorWindow)EditorWindow.GetWindow(typeof(TextureSizeEditorWindow), false, "TextureCompressSizeEditor", true); window.Show(); } private void OnGUI() { GUILayout.Label("请输入你要压缩的贴图的文件路径"); curFilePath = GUILayout.TextField(curFilePath); //Android--ETC2格式需要是4的倍数 GUILayout.Label("查找不是4的倍数的图片-ETC2 ："); if (GUILayout.Button("按照路径查找-按钮")) { curNumber = 0; allTexturePaths.Clear(); string newFilePath = curFilePath.Replace("\\", "_"); newFilePath = newFilePath.Replace(":", "_"); newFilePath = newFilePath.Replace("Assets/", ""); etc2logFullPath = Application.dataPath + "/" + newFilePath + ETC2_FILE_PATH; if (File.Exists(etc2logFullPath)) File.Delete(etc2logFullPath); fs = new FileStream(etc2logFullPath, FileMode.OpenOrCreate); GetAllTexturePath(); CheckAllTextureSizeCompress(); Debug.LogError("Android下查找不是4的倍数的图片-ETC2，PATH = " + etc2logFullPath); writeBytes = null; fs.Close(); } GUILayout.Label("设置图片为4的倍数 ： "); if (GUILayout.Button("按照路径修改-按钮")) { curNumber = 0; allTexturePaths.Clear(); allTextureExtension.Clear(); GetAllTexturePath(); ChangeAllTextureSizeCompress(); } GUILayout.Label("关闭进度条 ： "); if (GUILayout.Button("CloseBar-btn ")) { EditorUtility.ClearProgressBar(); } } void GetAllTexturePath() { if (string.IsNullOrEmpty(curFilePath)) { Debug.LogError("输入的路径有错，curFilePath = " + curFilePath); return; } SetAllTexturePath(curFilePath); } void SetAllTexturePath(string path) { DirectoryInfo info = new DirectoryInfo(path); DirectoryInfo[] dirInfo = info.GetDirectories(); FileInfo[] files = info.GetFiles(); foreach (var fileInfo in files) { if (fileInfo.Extension == ".meta") continue; if (fileInfo.Extension == ".png" || fileInfo.Extension == ".tga" || fileInfo.Extension == ".jpg") { string curPath = path + "/" + fileInfo.Name; Debug.LogError("文件的路径==" + curPath); allTexturePaths.Add(curPath); allTextureExtension.Add(fileInfo.Extension); } } foreach (DirectoryInfo nextDirInfo in dirInfo) { SetAllTexturePath(path + "/" + nextDirInfo.Name); } } void CheckAllTextureSizeCompress() { if (allTexturePaths == null || allTexturePaths.Count == 0) { Debug.LogError("allTexturePaths is nil or length =0 , 输入的路径有错，curFilePath = " + curFilePath); return; } for (int i = 0; i < allTexturePaths.Count; i++) { curNumber++; if (!string.IsNullOrEmpty(allTexturePaths)) { EditorUtility.DisplayProgressBar(string.Format("Spine Export{0}/{1}",curNumber,allTexturePaths.Count),allTexturePaths,(float)curNumber/(float)(allTexturePaths.Count)); if(allTexturePaths.Contains(ignoreDir)) continue; bool isExist = false; for(int j = 0; j<noCheckDir.Count; j++) { if (allTexturePaths.Contains(noCheckDir)) { isExist = true; } } if (isExist) continue; SetTextureSize(allTexturePaths); } } } void SetTextureSize(string path) { Texture2D texture2D = AssetDatabase.LoadAssetAtPath(path, typeof(Texture2D)) as Texture2D; if (texture2D != null) { if (!((texture2D.width % 4 == 0) && (texture2D.height % 4 == 0))) { writeBytes = Encoding.UTF8.GetBytes( path + ", width =" + texture2D.width + ",height =" +texture2D.height + "\n"); fs.Write(writeBytes, 0, writeBytes.Length); } if (allTexturePaths != null && allTexturePaths.Count == curNumber) { EditorUtility.ClearProgressBar(); } } } void ChangeAllTextureSizeCompress() { if (allTexturePaths == null || allTexturePaths.Count == 0) { Debug.LogError("allTexturePaths is nil or length =0 , 输入的路径有错，curFilePath = " + curFilePath); return; } for (int i = 0; i < allTexturePaths.Count; i++) { if (!string.IsNullOrEmpty(allTexturePaths)) { curNumber++; EditorUtility.DisplayProgressBar(string.Format("Spine Export{0}/{1}",curNumber,allTexturePaths.Count),allTexturePaths,(float)curNumber/(float)(allTexturePaths.Count)); if(allTexturePaths.Contains(ignoreDir)) continue; bool isExist = false; for(int j = 0; j<noCheckDir.Count; j++) { if (allTexturePaths.Contains(noCheckDir)) { isExist = true; } } if (isExist) continue; ChangeTextureSize(allTexturePaths, allTextureExtension); } } } void ChangeTextureSize(string path, string extension) { Texture2D texture2D = AssetDatabase.LoadAssetAtPath(path, typeof(Texture2D)) as Texture2D; bool needChange = false; if(texture2D != null) needChange = !((texture2D.width % 4 == 0) && (texture2D.height % 4 == 0)); if (needChange) { TextureImporterFormat lastTextureFormat; bool lastIsReadable; TextureImporter ti = (TextureImporter)TextureImporter.GetAtPath(path); lastTextureFormat = ti.textureFormat; lastIsReadable = ti.isReadable; ti.isReadable = true; ti.textureFormat = TextureImporterFormat.ARGB32; AssetDatabase.ImportAsset(path); Texture2D resultTexture = new Texture2D(texture2D.width + (4-texture2D.width%4), texture2D.height + (4-texture2D.height%4), TextureFormat.RGBA32, false); resultTexture.name = texture2D.name; int widthStart = (resultTexture.width - texture2D.width) / 2; int heightStart = (resultTexture.height - texture2D.height) / 2; Color outColor = new Color(0, 0, 0, 0); //左下角开始 for (int wIndex = 0; wIndex < resultTexture.width; wIndex++) { for (int hIndex = 0; hIndex < resultTexture.height; hIndex++) { if ((widthStart + wIndex) > texture2D.width + widthStart) { // if (wIndex % 2 == 0) // outColor = Color.black; // else // outColor = Color.red; resultTexture.SetPixel(wIndex, hIndex, outColor); }else if ( (heightStart + hIndex )> texture2D.height + heightStart) { // if (hIndex % 2 == 0) // outColor = Color.black; // else // outColor = Color.red; resultTexture.SetPixel(wIndex, hIndex, outColor); } else if(wIndex < widthStart) { // if (wIndex % 2 == 0) // outColor = Color.black; // else // outColor = Color.red; resultTexture.SetPixel(wIndex, hIndex, outColor); }else if (hIndex < heightStart) { // if (hIndex % 2 == 0) // outColor = Color.black; // else // outColor = Color.red; resultTexture.SetPixel(wIndex, hIndex, outColor); } else { resultTexture.SetPixel(wIndex, hIndex, texture2D.GetPixel(wIndex-widthStart, hIndex-heightStart)); } } } byte[] textuteByte = new byte[]{}; if (extension == ".png") { textuteByte = resultTexture.EncodeToPNG(); } else if(extension == ".tga") { textuteByte = resultTexture.EncodeToTGA(); }else if (extension == ".jpg") { textuteByte =resultTexture.EncodeToJPG(); } string filePath = Application.dataPath+ path.Replace("Assets",""); File.WriteAllBytes(filePath, textuteByte); ti = (TextureImporter)TextureImporter.GetAtPath(path); ti.isReadable = lastIsReadable; ti.textureFormat = lastTextureFormat; AssetDatabase.ImportAsset(path); AssetDatabase.SaveAssets(); AssetDatabase.Refresh(); Debug.LogError( "图片尺寸更改完成, " + path + ", width =" + texture2D.width + ",height =" +texture2D.height + "\n"); } if (allTexturePaths != null && allTexturePaths.Count == curNumber) { EditorUtility.ClearProgressBar(); } }}
3：也可以导入的时候设置2的N次方，但是感觉不适用。
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