Make undo/redo store tilemap cell indices and tileset tiles

Fixes issues with cases 0.5 and 5 of auto mode, and should be a better system overall. Only works with BaseDraw tools, needs to be applied everywhere as well.

src/Autoload/Global.gd

@@ -984,7 +984,6 @@ func undo_or_redo(
 			if action_name == "Scale":
 				cel.size_changed(project.size)
 			canvas.update_texture(layer_index, frame_index, project, undo)
-			cel.on_undo_redo(undo)
 		else:
 			for i in project.frames.size():
 				for j in project.layers.size():
@@ -992,7 +991,6 @@ func undo_or_redo(
 					if action_name == "Scale":
 						cel.size_changed(project.size)
 					canvas.update_texture(j, i, project, undo)
-					cel.on_undo_redo(undo)
 
 		canvas.selection.queue_redraw()
 		if action_name == "Scale":

src/Autoload/OpenSave.gd

@@ -269,7 +269,7 @@ func open_pxo_file(path: String, is_backup := false, replace_empty := true) -> v
 					var image := Image.create_from_data(
 						tile_size.x, tile_size.y, false, new_project.get_image_format(), image_data
 					)
-					tileset.add_tile(image, null, 2)
+					tileset.add_tile(image, null)
 		zip_reader.close()
 	new_project.export_directory_path = path.get_base_dir()
 
@@ -844,14 +844,14 @@ func open_image_as_tileset(
 	var frame_width := image.get_size().x / horiz
 	var frame_height := image.get_size().y / vert
 	var tile_size := Vector2i(frame_width, frame_height)
-	var tileset := TileSetCustom.new(tile_size, project, path.get_basename().get_file())
+	var tileset := TileSetCustom.new(tile_size, path.get_basename().get_file())
 	for yy in range(vert):
 		for xx in range(horiz):
 			var cropped_image := image.get_region(
 				Rect2i(frame_width * xx, frame_height * yy, frame_width, frame_height)
 			)
 			@warning_ignore("int_as_enum_without_cast")
-			tileset.add_tile(cropped_image, null, 2)
+			tileset.add_tile(cropped_image, null)
 	project.tilesets.append(tileset)
 
 
@@ -866,7 +866,7 @@ func open_image_as_tileset_smart(
 	if sliced_rects.size() == 0:  # Image is empty sprite (manually set data to be consistent)
 		tile_size = image.get_size()
 		sliced_rects.append(Rect2i(Vector2i.ZERO, tile_size))
-	var tileset := TileSetCustom.new(tile_size, project, path.get_basename().get_file())
+	var tileset := TileSetCustom.new(tile_size, path.get_basename().get_file())
 	for rect in sliced_rects:
 		var offset: Vector2 = (0.5 * (tile_size - rect.size)).floor()
 		var cropped_image := Image.create(
@@ -874,7 +874,7 @@ func open_image_as_tileset_smart(
 		)
 		cropped_image.blit_rect(image, rect, offset)
 		@warning_ignore("int_as_enum_without_cast")
-		tileset.add_tile(cropped_image, null, 2)
+		tileset.add_tile(cropped_image, null)
 	project.tilesets.append(tileset)
 
 

src/Classes/Cels/BaseCel.gd

@@ -77,10 +77,6 @@ func update_texture(_undo := false) -> void:
 				cel.texture_changed.emit()
 
 
-func on_undo_redo(_undo: bool) -> void:
-	pass
-
-
 ## Returns a curated [Dictionary] containing the cel data.
 func serialize() -> Dictionary:
 	var dict := {"opacity": opacity, "z_index": z_index}

src/Classes/Cels/CelTileMap.gd

@@ -29,9 +29,6 @@ var cells: Array[Cell]
 var horizontal_cells: int
 ## The amount of vertical cells.
 var vertical_cells: int
-## Dictionary of [int] and an [Array] of [bool] ([member TileSetPanel.placing_tiles])
-## and [enum TileSetPanel.TileEditingMode].
-var undo_redo_modes := {}
 ## Dictionary of [int] and [Array].
 ## The key is the index of the tile in the tileset,
 ## and the value is the index of the tilemap tile that changed first, along with
@@ -147,14 +144,9 @@ func transform_tile(
 	return transformed_tile
 
 
-func update_tileset(undo: bool) -> void:
+func update_tileset() -> void:
 	editing_images.clear()
-	var undos := tileset.project.undos
-	if not undo and not _is_redo():
-		undo_redo_modes[undos] = [TileSetPanel.placing_tiles, TileSetPanel.tile_editing_mode]
-	if undo:
-		undos += 1
-	var tile_editing_mode := _get_tile_editing_mode(undos)
+	var tile_editing_mode := TileSetPanel.tile_editing_mode
 	for i in cells.size():
 		var coords := get_cell_coords_in_image(i)
 		var rect := Rect2i(coords, tileset.tile_size)
@@ -171,7 +163,7 @@ func update_tileset(undo: bool) -> void:
 			if index == 0:
 				# If the tileset is empty, only then add a new tile.
 				if tileset.tiles.size() <= 1:
-					tileset.add_tile(image_portion, self, tile_editing_mode)
+					tileset.add_tile(image_portion, self)
 					cells[i].index = tileset.tiles.size() - 1
 				continue
 			if not tiles_equal(i, image_portion, current_tile.image):
@@ -189,12 +181,8 @@ func update_tileset(undo: bool) -> void:
 					found_tile = true
 					break
 			if not found_tile:
-				tileset.add_tile(image_portion, self, tile_editing_mode)
+				tileset.add_tile(image_portion, self)
 				cells[i].index = tileset.tiles.size() - 1
-	if undo:
-		var tile_removed := tileset.remove_unused_tiles(self)
-		if tile_removed:
-			_re_index_all_cells()
 
 
 ## Cases:[br]
@@ -256,7 +244,7 @@ func _handle_auto_editing_mode(i: int, image_portion: Image) -> void:
 		else:
 			# Case 2: The cell is not mapped already,
 			# and it does not exist in the tileset.
-			tileset.add_tile(image_portion, self, TileSetPanel.TileEditingMode.AUTO)
+			tileset.add_tile(image_portion, self)
 			cells[i].index = tileset.tiles.size() - 1
 	else:  # If the cell is already mapped.
 		if tiles_equal(i, image_portion, current_tile.image):
@@ -284,7 +272,7 @@ func _handle_auto_editing_mode(i: int, image_portion: Image) -> void:
 				# exist in the tileset as a tile,
 				# and the currently mapped tile still exists in the tileset.
 				tileset.unuse_tile_at_index(index, self)
-				tileset.add_tile(image_portion, self, TileSetPanel.TileEditingMode.AUTO)
+				tileset.add_tile(image_portion, self)
 				cells[i].index = tileset.tiles.size() - 1
 			else:
 				# Case 7: The cell is mapped and it does not
@@ -349,15 +337,6 @@ func _is_redo() -> bool:
 	return Global.control.redone
 
 
-func _get_tile_editing_mode(undos: int) -> TileSetPanel.TileEditingMode:
-	var tile_editing_mode: TileSetPanel.TileEditingMode
-	if undo_redo_modes.has(undos):
-		tile_editing_mode = undo_redo_modes[undos][1]
-	else:
-		tile_editing_mode = TileSetPanel.tile_editing_mode
-	return tile_editing_mode
-
-
 ## If the tileset has been modified by another tile, make sure to also update it here.
 func _on_tileset_updated(cel: CelTileMap) -> void:
 	if cel == self or not is_instance_valid(cel):
@@ -415,36 +394,29 @@ func size_changed(new_size: Vector2i) -> void:
 	_re_index_all_cells()
 
 
-func on_undo_redo(undo: bool) -> void:
-	var undos := tileset.project.undos
-	if undo:
-		undos += 1
-	if (undo or _is_redo()) and undo_redo_modes.has(undos):
-		var placing_tiles: bool = undo_redo_modes[undos][0]
-		if placing_tiles:
-			_re_index_all_cells()
-			return
-	update_tileset(undo)
-
-
 func serialize_undo_data() -> Dictionary:
 	var dict := {}
-	var cells_serialized := []
-	cells_serialized.resize(cells.size())
-	for i in cells.size():
-		cells_serialized[i] = cells[i].serialize()
-	dict["cells_data"] = cells_serialized
+	var cell_indices := []
+	cell_indices.resize(cells.size())
+	for i in cell_indices.size():
+		cell_indices[i] = cells[i].serialize()
+	dict["cell_indices"] = cell_indices
+	dict["tileset"] = tileset.serialize_undo_data()
 	return dict
 
 
 func deserialize_undo_data(dict: Dictionary, undo_redo: UndoRedo, undo: bool) -> void:
-	var cells_data = dict["cells_data"]
-	for i in cells_data.size():
-		var cell_data: Dictionary = cells_data[i]
+	var cell_indices = dict["cell_indices"]
 	if undo:
+		for i in cell_indices.size():
+			var cell_data: Dictionary = cell_indices[i]
 			undo_redo.add_undo_method(cells[i].deserialize.bind(cell_data))
+		undo_redo.add_undo_method(tileset.deserialize_undo_data.bind(dict.get("tileset"), self))
 	else:
+		for i in cell_indices.size():
+			var cell_data: Dictionary = cell_indices[i]
 			undo_redo.add_do_method(cells[i].deserialize.bind(cell_data))
+		undo_redo.add_do_method(tileset.deserialize_undo_data.bind(dict.get("tileset"), self))
 
 
 func serialize() -> Dictionary:

src/Classes/Project.gd

@@ -352,7 +352,7 @@ func deserialize(dict: Dictionary, zip_reader: ZIPReader = null, file: FileAcces
 	if dict.has("tilesets"):
 		for saved_tileset in dict["tilesets"]:
 			var tile_size = str_to_var("Vector2i" + saved_tileset.get("tile_size"))
-			var tileset := TileSetCustom.new(tile_size, self)
+			var tileset := TileSetCustom.new(tile_size)
 			tileset.deserialize(saved_tileset)
 			tilesets.append(tileset)
 	if dict.has("frames") and dict.has("layers"):

src/Classes/TileSetCustom.gd

@@ -10,8 +10,6 @@ extends RefCounted
 ## The [CelTileMap] that the changes are coming from is referenced in the [param cel] parameter.
 signal updated(cel: CelTileMap)
 
-## The [Project] the tileset is being used by.
-var project: Project
 ## The tileset's name.
 var name := ""
 ## The size of each individual tile.
@@ -24,45 +22,30 @@ var tiles: Array[Tile] = []
 class Tile:
 	## The [Image] tile itself.
 	var image: Image
-	## The mode that was used when this tile was added to the tileset.
-	var mode_added: TileSetPanel.TileEditingMode
 	## The amount of tiles this tile is being used in tilemaps.
 	var times_used := 1
-	## The step number of undo/redo when this tile was added to the tileset.
-	var undo_step_added := 0
 
-	func _init(
-		_image: Image, _mode_added: TileSetPanel.TileEditingMode, _undo_step_added := 0
-	) -> void:
+	func _init(_image: Image) -> void:
 		image = _image
-		mode_added = _mode_added
-		undo_step_added = _undo_step_added
 
 	## A method that checks if the tile should be removed from the tileset.
-	## Returns [code]true[/code] if the current undo step is less than [member undo_step_added],
-	## which essentially means that the tile always gets removed if the user undos to the point
-	## the tile was added to the tileset.
-	## Otherwise, it returns [code]true[/code] if [member mode_added] is not equal to
-	## [enum TileSetPanel.TileEditingMode.STACK] and the amount of [member times_used] is 0.
-	func can_be_removed(project: Project) -> bool:
-		if project.undos < undo_step_added:
-			return true
-		return mode_added != TileSetPanel.TileEditingMode.STACK and times_used <= 0
+	## Returns [code]true[/code] if the amount of [member times_used] is 0.
+	func can_be_removed() -> bool:
+		return times_used <= 0
 
 
-func _init(_tile_size: Vector2i, _project: Project, _name := "") -> void:
+func _init(_tile_size: Vector2i, _name := "") -> void:
 	tile_size = _tile_size
-	project = _project
 	name = _name
 	var empty_image := Image.create_empty(tile_size.x, tile_size.y, false, Image.FORMAT_RGBA8)
-	tiles.append(Tile.new(empty_image, TileSetPanel.tile_editing_mode))
+	tiles.append(Tile.new(empty_image))
 
 
 ## Adds a new [param image] as a tile to the tileset.
 ## The [param cel] parameter references the [CelTileMap] that this change is coming from,
 ## and the [param edit_mode] parameter contains the tile editing mode at the time of this change.
-func add_tile(image: Image, cel: CelTileMap, edit_mode: TileSetPanel.TileEditingMode) -> void:
-	var tile := Tile.new(image, edit_mode, project.undos)
+func add_tile(image: Image, cel: CelTileMap) -> void:
+	var tile := Tile.new(image)
 	tiles.append(tile)
 	updated.emit(cel)
 
@@ -70,10 +53,8 @@ func add_tile(image: Image, cel: CelTileMap, edit_mode: TileSetPanel.TileEditing
 ## Adds a new [param image] as a tile in a given [param position] in the tileset.
 ## The [param cel] parameter references the [CelTileMap] that this change is coming from,
 ## and the [param edit_mode] parameter contains the tile editing mode at the time of this change.
-func insert_tile(
-	image: Image, position: int, cel: CelTileMap, edit_mode: TileSetPanel.TileEditingMode
-) -> void:
-	var tile := Tile.new(image, edit_mode, project.undos)
+func insert_tile(image: Image, position: int, cel: CelTileMap) -> void:
+	var tile := Tile.new(image)
 	tiles.insert(position, tile)
 	updated.emit(cel)
 
@@ -86,7 +67,7 @@ func insert_tile(
 ## The [param cel] parameter references the [CelTileMap] that this change is coming from.
 func unuse_tile_at_index(index: int, cel: CelTileMap) -> bool:
 	tiles[index].times_used -= 1
-	if tiles[index].can_be_removed(project):
+	if tiles[index].can_be_removed():
 		remove_tile_at_index(index, cel)
 		return true
 	return false
@@ -122,7 +103,7 @@ func remove_unused_tiles(cel: CelTileMap) -> bool:
 	var tile_removed := false
 	for i in range(tiles.size() - 1, 0, -1):
 		var tile := tiles[i]
-		if tile.can_be_removed(project):
+		if tile.can_be_removed():
 			remove_tile_at_index(i, cel)
 			tile_removed = true
 	return tile_removed
@@ -139,3 +120,25 @@ func serialize() -> Dictionary:
 func deserialize(dict: Dictionary) -> void:
 	name = dict.get("name", name)
 	tile_size = str_to_var("Vector2i" + dict.get("tile_size"))
+
+
+func serialize_undo_data() -> Dictionary:
+	var dict := {}
+	for tile in tiles:
+		var image_data := tile.image.get_data()
+		dict[tile.image] = [image_data.compress(), image_data.size(), tile.times_used]
+	return dict
+
+
+func deserialize_undo_data(dict: Dictionary, cel: CelTileMap) -> void:
+	tiles.resize(dict.size())
+	var i := 0
+	for image: Image in dict:
+		var tile_data = dict[image]
+		var buffer_size := tile_data[1] as int
+		var image_data := (tile_data[0] as PackedByteArray).decompress(buffer_size)
+		image.set_data(tile_size.x, tile_size.y, false, image.get_format(), image_data)
+		tiles[i] = Tile.new(image)
+		tiles[i].times_used = tile_data[2]
+		i += 1
+	updated.emit(cel)

src/Tools/BaseDraw.gd

@@ -272,6 +272,9 @@ func prepare_undo(action: String) -> void:
 
 
 func commit_undo() -> void:
+	for cel in _undo_data:
+		if cel is CelTileMap:
+			(cel as CelTileMap).update_tileset()
 	var redo_data := _get_undo_data()
 	var project := Global.current_project
 	var frame := -1

src/UI/Timeline/NewTileMapLayerDialog.gd

@@ -14,7 +14,7 @@ func _on_confirmed() -> void:
 	var tile_size := tile_size_slider.value
 	var tileset: TileSetCustom
 	if tileset_option_button.selected == 0:
-		tileset = TileSetCustom.new(tile_size, project, tileset_name)
+		tileset = TileSetCustom.new(tile_size, tileset_name)
 	else:
 		tileset = project.tilesets[tileset_option_button.selected - 1]
 	var layer := LayerTileMap.new(project, tileset, layer_name)