public override void drawOnImage(ref Image image, BoundingBox boundingBox)
            {
                BitmapDecal decal;
                if (!BitmapDecalCache.Instance.decals.TryGetValue(_url, out decal)) return;

                Image decalImage = new Image(decal.image);
                Color32 color = new Color32(_red, _green, _blue, _alpha);
                decalImage.recolor(Global.Black32, color, false, true);
                decalImage.rotateImage(_rotation);
                if (_mirror) decalImage.flipHorizontally();

                image.blendImage(decalImage, _blendMethod, _position, _alphaOption, _textureAlpha, boundingBox);
            }
                public override void drawRight(TextureEditGUI gui)
                {
                    if (BitmapDecalCache.Instance.monoSheets.Count == 0) return;

                    Color contentColor = GUI.contentColor;
                    GUI.backgroundColor = Global.BackgroundColor;

                    _scrollPos = GUILayout.BeginScrollView(_scrollPos, GUI.skin.box, GUILayout.MinWidth(250), GUILayout.ExpandHeight(true));

                    GUILayout.Label("Decal Sheets");

                    GUILayout.Space(3);

                    int oldSelectedSheet = _selectedSheet;
                    for (int i = 0; i < BitmapDecalCache.Instance.monoSheets.Count; ++i)
                    {
                        if (i == _selectedSheet) GUI.contentColor = Global.SelectedColor;
                        else GUI.contentColor = Global.NotSelectedColor;

                        if (GUILayout.Button(BitmapDecalCache.Instance.monoSheets[i].displayName, GUILayout.ExpandWidth(true))) _selectedSheet = i;
                    }

                    if (_selectedSheet != oldSelectedSheet)
                    {
                        if (_textures != null)
                        {
                            for (int i = 0; i < _textures.Count; ++i)
                            {
                                UnityEngine.Object.Destroy(_textures[i]);
                            }
                            _textures = null;
                        }
                        if (_selectedDecal >= BitmapDecalCache.Instance.monoSheets[_selectedSheet].decals.Count) _selectedDecal = 0;
                    }

                    GUILayout.Space(10);

                    GUILayout.Label("Decals");

                    GUILayout.Space(3);

                    if (_textures == null)
                    {
                        _textures = new List<Texture2D>();
                        for (int i = 0; i < BitmapDecalCache.Instance.monoSheets[_selectedSheet].decals.Count; ++i)
                        {
                            Image image = new Image(BitmapDecalCache.Instance.monoSheets[_selectedSheet].decals[i].image);
                            image.recolor(Global.Black32, Global.White32, false, false);

                            Texture2D texture = new Texture2D(image.width, image.height, TextureFormat.ARGB32, false);
                            texture.SetPixels32(image.pixels);
                            texture.Apply();

                            _textures.Add(texture);
                        }
                    }

                    int oldSelectedDecal = _selectedDecal;
                    int x = 0;
                    GUILayout.BeginHorizontal();
                    for (int i = 0; i < _textures.Count; ++i)
                    {
                        if (i == _selectedDecal)
                        {
                            GUI.backgroundColor = Color.yellow;
                            if (GUILayout.Button(_textures[i], GUILayout.Width(_textures[i].width + 4), GUILayout.Height(_textures[i].height + 4))) _selectedDecal = i;
                            GUI.backgroundColor = Global.BackgroundColor;
                        }
                        else
                        {
                            if (GUILayout.Button(_textures[i], GUILayout.Width(_textures[i].width + 4), GUILayout.Height(_textures[i].height + 4))) _selectedDecal = i;
                        }

                        x += _textures[i].width + 5;
                        if (i < (_textures.Count - 1))
                        {
                            if (x > 0 && (x + _textures[i+1].width) > 200)
                            {
                                GUILayout.EndHorizontal();
                                GUILayout.BeginHorizontal();
                                x = 0;
                            }
                        }
                    }
                    GUILayout.EndHorizontal();

                    GUILayout.EndScrollView();

                    GUI.contentColor = contentColor;

                    if (oldSelectedSheet != _selectedSheet || oldSelectedDecal != _selectedDecal)
                    {
                        _imBitmapMonoDecal._url = BitmapDecalCache.Instance.monoSheets[_selectedSheet].decals[_selectedDecal].url;
                        gui.setRemakePreview();
                    }
                }
            protected void drawDecalOnImage(ref Image image, ref Image normalMap, string _url, BoundingBox boundingBox)
            {
                BitmapDecal decal;
                if (!BitmapDecalCache.Instance.decals.TryGetValue(_url, out decal)) return;

                drawOnImage(ref image, boundingBox);

                if (_normalOption == NormalOption.USE_BACKGROUND) return;

                Image backgroundImage = new Image(normalMap.width, normalMap.height);
                Color32 backgroudColor = new Color32(127, 127, 127, 0);
                backgroundImage.fill(backgroudColor);

                Color32 color = Global.Gray32;
                if (_normalOption == NormalOption.RAISE_TEXT) color = Global.White32;
                if (_normalOption == NormalOption.LOWER_TEXT) color = Global.Black32;

                Image decalImage = new Image(decal.image);
                decalImage.recolor(Global.Black32, color, false, true);
                decalImage.rotateImage(_rotation);
                if (_mirror) decalImage.flipHorizontally();

                backgroundImage.blendImage(decalImage, BlendMethod.PIXEL, _position, AlphaOption.OVERWRITE, 255, boundingBox);

                Image normalMapImage = backgroundImage.createNormalMap(_normalScale);

                if (image.width == normalMap.width && image.height == normalMap.height) normalMap.rescale(image.width, image.height);
                normalMap.overlay(normalMapImage, backgroundImage, 128, boundingBox);
            }