source: binary-improvements/AllocsCommands/Commands/ExportItemIcons.cs@ 275

using System;
using System.Collections.Generic;
using System.IO;

using UnityEngine;

namespace AllocsFixes.CustomCommands
{
        public class ExportItemIcons : ConsoleCmdAbstract
        {
                public override string GetDescription ()
                {
                        return "Exports all ItemIcons";
                }

                public override string GetHelp () {
                        return "Exports all ItemIcons currently in the game to the folder \"ItemIcons\" in the game root";
                }

                public override string[] GetCommands ()
                {
                        return new string[] { "exportitemicons" };
                }

                public override void Execute (List<string> _params, CommandSenderInfo _senderInfo) {
                        string exportPath = Utils.GetGameDir ("ItemIcons");

                        GameObject atlasObj = GameObject.Find ("/NGUI Root (2D)/ItemIconAtlas");
                        if (atlasObj == null) {
                                SdtdConsole.Instance.Output ("Atlas object not found");
                                return;
                        }
                        DynamicUIAtlas atlas = atlasObj.GetComponent<DynamicUIAtlas> ();
                        if (atlas == null) {
                                SdtdConsole.Instance.Output ("Atlas component not found");
                                return;
                        }

                        Texture2D atlasTex = atlas.texture as Texture2D;

                        if (Directory.Exists (exportPath)) {
                                SdtdConsole.Instance.Output ("Export path (" + exportPath + ") already exists");
                                return;
                        }
                        Directory.CreateDirectory (exportPath);

                        foreach (UISpriteData data in atlas.spriteList) {
                                string name = data.name;
                                Texture2D tex = new Texture2D (data.width, data.height, TextureFormat.ARGB32, false);
                                tex.SetPixels (atlasTex.GetPixels (data.x, atlasTex.height - data.height - data.y, data.width, data.height));
                                byte[] pixData = tex.EncodeToPNG ();
                                File.WriteAllBytes (exportPath + "/" + name + ".png", pixData);

                                UnityEngine.Object.Destroy (tex);
                        }

                }
        }
}