Texture2dをPNGに変換するスクリプト

Texture2dToPNG.cs

//Texture2dをTexture[]に設定し、...から"Convert to PNG"で変換することができます
//UnityEditorでの使用を想定

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;
using System.IO;

public class Texture2dToPNG : MonoBehaviour
{
    [SerializeField]Texture2D[] texture;
    [Space(20)]
    [SerializeField]string _path;
    [SerializeField]string FileName;
    int i,o;
    
    Texture2D createReadabeTexture2D(Texture2D texture2d)
    {
        RenderTexture renderTexture = RenderTexture.GetTemporary(
                    texture2d.width,
                    texture2d.height,
                    0,
                    RenderTextureFormat.Default,
                    RenderTextureReadWrite.Linear);
        Graphics.Blit(texture2d, renderTexture);
        RenderTexture previous = RenderTexture.active;
        RenderTexture.active = renderTexture;
        Texture2D readableTextur2D = new Texture2D(texture2d.width, texture2d.height);
        readableTextur2D.ReadPixels(new Rect(0, 0, renderTexture.width, renderTexture.height), 0, 0);
        readableTextur2D.Apply();
        RenderTexture.active = previous;
        RenderTexture.ReleaseTemporary(renderTexture);
        return readableTextur2D;
    }

    [ContextMenu("Convert to PNG")]void toPNG(){Convert(0);}
    [ContextMenu("Convert to JPEG")]void toJPEG(){Convert(1);}
    [ContextMenu("Convert to TGA")]void toEXR(){Convert(2);}

    void Convert(int Format)
    {
        string[] _missing = new string[texture.Length];
        string missing = "0, ";
        string notmissing = "";
        bool firstmissing = false;
        bool UseTexture2dName = false;
        byte[] bytes = null;
        string _format = "";
        for(i=0;i!=texture.Length;i++)
        {
            if(texture[i] == null)
            {
                for(o=0;o!=_missing.Length;o++)
                {
                    if(_missing[o] == "")
                    {
                        _missing[o] = i.ToString();
                        break;
                    }
                }
                if(!firstmissing)
                {
                    firstmissing = true;
                    missing = "";
                }
                missing = missing + i.ToString() + ", ";
            }else
            {
                notmissing = notmissing + i.ToString() + ", ";
            }
        }
        if(missing != "")
        {
            missing = missing.Remove((missing.Length - 2));
            if(missing == "0" && notmissing != ""){
            }else
            {
                if(notmissing != "")
                {
                    notmissing = notmissing.Remove((notmissing.Length - 2));
                    bool ConvertOnlyNotMissing = EditorUtility.DisplayDialog("確認","Texture[" + missing + "]にTexture2dが設定されていませんが、\nTexture[" + notmissing + "]にはTexture2dが設定されています。このまま実行しますか？", "はい","いいえ");
                    if(!ConvertOnlyNotMissing)return;
                }else
                {
                    EditorUtility.DisplayDialog("エラー","Texture[" + missing + "]にTexture2dが設定されていません。", "了解");
                    Debug.LogError("Texture[" + missing + "]にTexture2dが設定されていません。");
                    return;
                }
            } 
        }
        string DateAndTime = System.DateTime.Now.ToString().Replace("/","_").Replace(":",".").Replace(" ","-");
        _path = _path.Replace("<date>",DateAndTime);
        if(_path == "")
        {
            _path = EditorUtility.OpenFolderPanel("フォルダを指定してください","","");
        }else if(!Directory.Exists(_path))
        {
            bool CreateFolder = EditorUtility.DisplayDialog("確認","選択されたパスは存在しません。フォルダを作成しますか?","はい","いいえ");
            if(CreateFolder)
            {
                Directory.CreateDirectory(_path);
            }else
            {
                return;
            }
        }
        if( _path.EndsWith("/") || _path.EndsWith("\\") ) _path = _path.Remove((_path.Length - 1));
        bool skipConvert = false;
        for(i=0;i!=texture.Length;i++)
        {
            if(FileName == "") UseTexture2dName = true;
            if(texture[i] == null) skipConvert = true;
            if(!skipConvert)
            {
                switch(Format)
                {
                case 0:
                    bytes = createReadabeTexture2D(texture[i]).EncodeToPNG();
                    _format = ".png";
                    break;
                case 1:
                    bytes = createReadabeTexture2D(texture[i]).EncodeToJPG();
                    _format = ".jpeg";
                    break;
                case 2:
                    bytes = createReadabeTexture2D(texture[i]).EncodeToTGA();
                    _format = ".tga";
                    break;
                default:
                    _format = "";
                    break;
                }
                string size = createReadabeTexture2D(texture[i]).height + "x" + createReadabeTexture2D(texture[i]).width;
                string path = _path + "/";
                if(UseTexture2dName) FileName = texture[i].name;
                File.WriteAllBytes(path + size + "_" + DateAndTime + "." + FileName + i.ToString() + _format, bytes);
                Debug.Log("\"" + texture[i].name + "\" の" + _format.Replace(".","").ToUpper() + "ファイルの生成に成功しました。");
            }else if(skipConvert)
            {
                skipConvert = false;
            } 
        }
        if(UseTexture2dName) FileName = null;
        System.Diagnostics.Process.Start(_path);
    }
}