The RGB and alpha channel separation for images in the "improved" Unity project

http://blog.csdn.net/u010153703/article/details/39477887

"There are two obvious questions in this article:
1. Processing an alpha map is a pixel-by-pixel processing with the Texture.setpixel () function. Recommended batch processing, using the Texture.setpixels () function. Recommended batch processing, using the Texture.setpixels () function. ”

The improvement:

Using Unityengine;  Using System.Collections;  Using System.Collections.Generic;  Using Unityeditor;  Using System.IO;    Using System.Reflection;    public class materialtextureforetc1{private static string defaultwhitetexpath_relative = "Assets/default_alpha.png";      private static texture2d Defaultwhitetex = null;        [MenuItem ("Effortforetc1/depart RGB and Alpha Channel")] static void Seperatealltexturesrgbandalphachannel () {        Debug.Log ("Start departing."); if (!        Getdefaultwhitetexture ()) {return;        } string[] paths = Directory.GetFiles (Application.datapath, "* *", searchoption.alldirectories); foreach (string path in Paths) {if (!string. IsNullOrEmpty (path) && istexturefile (path) &&!            istextureconverted (path))//full name {seperatergbaandlphachannel (path);    }} assetdatabase.refresh (); Refresh to ensure new generated RBA andAlpha textures shown in Unity as well as the meta file Debug.Log ("Finish departing."); } #region Process texture static void Seperatergbaandlphachannel (String _texpath) {string Assetrelativepa        th = Getrelativeassetpath (_texpath);    Settexturereadableex (Assetrelativepath); Set readable flag and set TextureFormat TrueColor texture2d Sourcetex = Resources.loadassetatpath (Assetrelativepa  Th, typeof (Texture2d)) as texture2d; Not just the textures under Resources file if (!sourcetex) {debug.logerror ("Load Texture Fai            LED: "+ Assetrelativepath);        Return        } Textureimporter ti = null;        try {ti = (textureimporter) textureimporter.getatpath (Assetrelativepath);            } catch {Debug.logerror ("Load Texture failed:" + assetrelativepath);        Return        } if (ti = = null) {return; } bool Bgeneratemipmap = ti.mipmapenabled; Same with the texture import setting texture2d Rgbtex = new Texture2d (Sourcetex.width, Sourcetex.height, Te        Xtureformat.rgb24, Bgeneratemipmap); Rgbtex.setpixels (Sourcetex.             Getpixels ());  Texture2d Mipmaptex = new Texture2d (Sourcetex.width, Sourcetex.height, Textureformat.rgba32, true); Alpha Channel needed here mipmaptex.setpixels (Sourcetex.        Getpixels ());        Mipmaptex.apply ();   color[] Colors2rdlevel = mipmaptex.getpixels (1);        Second level of Mipmap color[] Colorsalpha = new Color[colors2rdlevel.length]; if (colors2rdlevel.length! = (mipmaptex.width+1)/2 * (mipmaptex.height+1)/2) {Debug.logerror ("Size            Error. ");        Return        } bool Balphaexist = FALSE;            for (int i = 0; i < colors2rdlevel.length; ++i) {COLORSALPHA[I].R = colors2rdlevel[i].a;            COLORSALPHA[I].G = COLORS2RDLEVEL[I].A; COLORSALPHA[I].B = Colors2RDLEVEL[I].A; if (!            Mathf.approximately (COLORS2RDLEVEL[I].A, 1.0f)) {balphaexist = true;        }} texture2d Alphatex = null; if (balphaexist) {Alphatex = new texture2d ((sourcetex.width+1)/2, (sourcetex.height+1)/2, TEXTUREFO Rmat.        RGB24, Bgeneratemipmap); } else {Alphatex = new texture2d (Defaultwhitetex.width, Defaultwhitetex.height, TEXTUREFORMAT.RG        B24, false);        } alphatex.setpixels (Colorsalpha);        Rgbtex.apply ();        Alphatex.apply ();        byte[] bytes = Rgbtex.encodetopng ();        File.writeallbytes (Assetrelativepath, bytes);        byte[] alphabytes = Alphatex.encodetopng ();        String alphatexrelativepath = Getalphatexpath (_texpath);        File.writeallbytes (Alphatexrelativepath, alphabytes);        Reimportasset (Assetrelativepath, Rgbtex.width, rgbtex.height); Reimportasset (Alphatexrelativepath, Alphatex.width, alphatex.height);        Debug.Log ("Succeed departing:" + Assetrelativepath); } static void Reimportasset (string path, int width, int height) {try {Assetdatabase.impor        Tasset (path);            } catch {Debug.logerror ("Import Texture failed:" + path);        Return        } textureimporter importer = null;        try {importer = (textureimporter) textureimporter.getatpath (path);            } catch {Debug.logerror ("Load Texture failed:" + path);        Return        } if (importer = = null) {return;        } importer.maxtexturesize = Mathf.max (width, height);        Importer.anisolevel = 0;  Importer.isreadable = false;        Increase memory cost If readable is true importer.textureformat = textureimporterformat.automaticcompressed;        Importer.texturetype = Textureimportertype.image; if (path. Contains ("/ui/")) {ImporTer.texturetype = Textureimportertype.gui;    } assetdatabase.importasset (path);    } static void Settexturereadableex (string _relativeassetpath)//set readable flag and set TextureFormat TrueColor        {Textureimporter ti = null;        try {ti = (textureimporter) textureimporter.getatpath (_relativeassetpath);            } catch {Debug.logerror ("Load Texture failed:" + _relativeassetpath);        Return        } if (ti = = null) {return;        } ti.isreadable = true;      Ti.textureformat = Textureimporterformat.automatictruecolor; This is essential for departing textures for ETC1.        No compression format for following operation.    Assetdatabase.importasset (_relativeassetpath); } static bool Getdefaultwhitetexture () {Defaultwhitetex = Resources.loadassetatpath (Defaultwhitetexpath_rela  tive, typeof (Texture2d)) as texture2d; Not just the textures unDer Resources file if (!defaultwhitetex) {debug.logerror ("Load Texture Failed:" + defaultwhi            tetexpath_relative);        return false;    } return true; } #endregion #region string or path helper static bool Istexturefile (string _path) {string Path = _path.          ToLower (); return path. EndsWith (". psd") | | Path. EndsWith (". TGA") | | Path. EndsWith (". png") | | Path. EndsWith (". jpg") | | Path. EndsWith (". bmp") | | Path. EndsWith (". tif") | | Path.      EndsWith (". gif"); } static bool Istextureconverted (string _path) {return _path. Contains ("_rgb.") | | _path.    Contains ("_alpha.");      } static string Getrgbtexpath (String _texpath) {return Gettexpath (_texpath, "_rgb.");      } static string Getalphatexpath (String _texpath) {return Gettexpath (_texpath, "_alpha."); } static string Gettexpath (String _texpath, String _texrole) {string dir = system.io.pAth.        GetDirectoryName (_texpath);        string filename = System.IO.Path.GetFileNameWithoutExtension (_texpath);        string result = Dir + "/" + filename + _texrole + "png";      return result;          } static string Getrelativeassetpath (String _fullpath) {_fullpath = Getrightformatpath (_fullpath);          int idx = _fullpath.indexof ("Assets");          String assetrelativepath = _fullpath.substring (idx);      return assetrelativepath; } static string Getrightformatpath (String _path) {return _path.      Replace ("\ \", "/");   } #endregion}

The RGB and alpha channel separation for images in the "improved" Unity project