1：resize_pic.py脚本，这种直接改了原图片的宽+高。
python->PIL
import os
from PIL import Image
import 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:
yield f
#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 allTexturePaths = new List();
private List allTextureExtension = new List();
//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 noCheckDir = new List {"Assets\\Main/Atlas", "Assets\\Main/Sprites"};
[MenuItem("Texture/TextureCompressSize")]
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[i]))
{
EditorUtility.DisplayProgressBar(string.Format("Spine Export{0}/{1}",curNumber,allTexturePaths.Count),allTexturePaths[i],(float)curNumber/(float)(allTexturePaths.Count));
if(allTexturePaths[i].Contains(ignoreDir))
continue;
bool isExist = false;
for(int j = 0; j 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。