class_name Project extends Reference
# A class for project properties.

var name := "" setget name_changed
var size : Vector2 setget size_changed
var undo_redo : UndoRedo
var tile_mode : int = Global.TileMode.NONE
var tile_mode_rects := [] # Cached to avoid recalculation
var undos := 0 # The number of times we added undo properties
var has_changed := false setget has_changed_changed
var frames := [] setget frames_changed # Array of Frames (that contain Cels)
var layers := [] setget layers_changed # Array of Layers
var current_frame := 0 setget frame_changed
var current_layer := 0 setget layer_changed
var animation_tags := [] setget animation_tags_changed # Array of AnimationTags
var guides := [] # Array of Guides
var brushes := [] # Array of Images
var fps := 6.0

var x_symmetry_point
var y_symmetry_point
var x_symmetry_axis : SymmetryGuide
var y_symmetry_axis : SymmetryGuide

var selection_bitmap := BitMap.new()
# This is useful for when the selection is outside of the canvas boundaries, on the left and/or above (negative coords)
var selection_offset := Vector2.ZERO setget _selection_offset_changed
var has_selection := false

# For every camera (currently there are 3)
var cameras_zoom := [Vector2(0.15, 0.15), Vector2(0.15, 0.15), Vector2(0.15, 0.15)] # Array of Vector2
var cameras_offset := [Vector2.ZERO, Vector2.ZERO, Vector2.ZERO] # Array of Vector2

# Export directory path and export file name
var directory_path := ""
var file_name := "untitled"
var file_format : int = Export.FileFormat.PNG
var was_exported := false


func _init(_frames := [], _name := tr("untitled"), _size := Vector2(64, 64)) -> void:
	frames = _frames
	name = _name
	size = _size
	selection_bitmap.create(size)
	update_tile_mode_rects()

	undo_redo = UndoRedo.new()

	Global.tabs.add_tab(name)
	OpenSave.current_save_paths.append("")
	OpenSave.backup_save_paths.append("")

	x_symmetry_point = size.x / 2
	y_symmetry_point = size.y / 2

	if !x_symmetry_axis:
		x_symmetry_axis = SymmetryGuide.new()
		x_symmetry_axis.type = x_symmetry_axis.Types.HORIZONTAL
		x_symmetry_axis.project = self
		x_symmetry_axis.add_point(Vector2(-19999, y_symmetry_point))
		x_symmetry_axis.add_point(Vector2(19999, y_symmetry_point))
		Global.canvas.add_child(x_symmetry_axis)

	if !y_symmetry_axis:
		y_symmetry_axis = SymmetryGuide.new()
		y_symmetry_axis.type = y_symmetry_axis.Types.VERTICAL
		y_symmetry_axis.project = self
		y_symmetry_axis.add_point(Vector2(x_symmetry_point, -19999))
		y_symmetry_axis.add_point(Vector2(x_symmetry_point, 19999))
		Global.canvas.add_child(y_symmetry_axis)

	if OS.get_name() == "HTML5":
		directory_path = "user://"
	else:
		directory_path = OS.get_system_dir(OS.SYSTEM_DIR_DESKTOP)


func commit_undo() -> void:
	if Global.canvas.selection.is_moving_content:
		Global.canvas.selection.move_content_cancel()
	else:
		undo_redo.undo()


func commit_redo() -> void:
	Global.control.redone = true
	undo_redo.redo()
	Global.control.redone = false


func selection_bitmap_changed() -> void:
	var image := Image.new()
	var image_texture := ImageTexture.new()
	has_selection = selection_bitmap.get_true_bit_count() > 0
	if has_selection:
		image = bitmap_to_image(selection_bitmap)
		image_texture.create_from_image(image, 0)
	Global.canvas.selection.marching_ants_outline.texture = image_texture


func _selection_offset_changed(value : Vector2) -> void:
	selection_offset = value
	Global.canvas.selection.marching_ants_outline.offset = selection_offset
	Global.canvas.selection.update_on_zoom(Global.camera.zoom.x)


func change_project() -> void:
	# Remove old nodes
	for container in Global.layers_container.get_children():
		container.queue_free()

	remove_cel_buttons()

	for frame_id in Global.frame_ids.get_children():
		Global.frame_ids.remove_child(frame_id)
		frame_id.queue_free()

	# Create new ones
	for i in range(layers.size() - 1, -1, -1):
		# Create layer buttons
		var layer_container = load("res://src/UI/Timeline/LayerButton.tscn").instance()
		layer_container.i = i
		if layers[i].name == tr("Layer") + " 0":
			layers[i].name = tr("Layer") + " %s" % i

		Global.layers_container.add_child(layer_container)
		layer_container.label.text = layers[i].name
		layer_container.line_edit.text = layers[i].name

		Global.frames_container.add_child(layers[i].frame_container)
		for j in range(frames.size()): # Create Cel buttons
			var cel_button = load("res://src/UI/Timeline/CelButton.tscn").instance()
			cel_button.frame = j
			cel_button.layer = i
			cel_button.get_child(0).texture = frames[j].cels[i].image_texture
			if j == current_frame and i == current_layer:
				cel_button.pressed = true

			layers[i].frame_container.add_child(cel_button)

	for j in range(frames.size()): # Create frame ID labels
		var label := Label.new()
		label.rect_min_size.x = Global.animation_timeline.cel_size
		label.align = Label.ALIGN_CENTER
		label.text = str(j + 1)
		if j == current_frame:
			label.add_color_override("font_color", Global.control.theme.get_color("Selected Color", "Label"))
		Global.frame_ids.add_child(label)

	var layer_button = Global.layers_container.get_child(Global.layers_container.get_child_count() - 1 - current_layer)
	layer_button.pressed = true

	Global.current_frame_mark_label.text = "%s/%s" % [str(current_frame + 1), frames.size()]

	Global.disable_button(Global.remove_frame_button, frames.size() == 1)
	Global.disable_button(Global.move_left_frame_button, frames.size() == 1 or current_frame == 0)
	Global.disable_button(Global.move_right_frame_button, frames.size() == 1 or current_frame == frames.size() - 1)
	toggle_layer_buttons_layers()
	toggle_layer_buttons_current_layer()

	self.animation_tags = animation_tags

	# Change the guides
	for guide in Global.canvas.get_children():
		if guide is Guide:
			if guide in guides:
				guide.visible = Global.show_guides
				if guide is SymmetryGuide:
					if guide.type == Guide.Types.HORIZONTAL:
						guide.visible = Global.show_x_symmetry_axis and Global.show_guides
					else:
						guide.visible = Global.show_y_symmetry_axis and Global.show_guides
			else:
				guide.visible = false

	# Change the project brushes
	Brushes.clear_project_brush()
	for brush in brushes:
		Brushes.add_project_brush(brush)

	Global.canvas.update()
	Global.canvas.grid.update()
	Global.transparent_checker._ready()
	Global.animation_timeline.fps_spinbox.value = fps
	Global.horizontal_ruler.update()
	Global.vertical_ruler.update()
	Global.cursor_position_label.text = "[%s×%s]" % [size.x, size.y]

	Global.window_title = "%s - Pixelorama %s" % [name, Global.current_version]
	if has_changed:
		Global.window_title = Global.window_title + "(*)"

	var save_path = OpenSave.current_save_paths[Global.current_project_index]
	if save_path != "":
		Global.open_sprites_dialog.current_path = save_path
		Global.save_sprites_dialog.current_path = save_path
		Global.top_menu_container.file_menu.set_item_text(4, tr("Save") + " %s" % save_path.get_file())
	else:
		Global.top_menu_container.file_menu.set_item_text(4, tr("Save"))

	Export.directory_path = directory_path
	Export.file_name = file_name
	Export.file_format = file_format
	Export.was_exported = was_exported

	if !was_exported:
		Global.top_menu_container.file_menu.set_item_text(6, tr("Export"))
	else:
		Global.top_menu_container.file_menu.set_item_text(6, tr("Export") + " %s" % (file_name + Export.file_format_string(file_format)))

	for j in Global.TileMode.values():
		Global.tile_mode_submenu.set_item_checked(j, j == tile_mode)

	# Change selection effect & bounding rectangle
	Global.canvas.selection.marching_ants_outline.offset = selection_offset
	selection_bitmap_changed()
	Global.canvas.selection.big_bounding_rectangle = get_selection_rectangle()
	Global.canvas.selection.big_bounding_rectangle.position += selection_offset
	Global.canvas.selection.update()

	var i := 0
	for camera in [Global.camera, Global.camera2, Global.camera_preview]:
		camera.zoom = cameras_zoom[i]
		camera.offset = cameras_offset[i]
		camera.zoom_changed()
		i += 1


func serialize() -> Dictionary:
	var layer_data := []
	for layer in layers:
		var linked_cels := []
		for cel in layer.linked_cels:
			linked_cels.append(frames.find(cel))

		layer_data.append({
			"name" : layer.name,
			"visible" : layer.visible,
			"locked" : layer.locked,
			"new_cels_linked" : layer.new_cels_linked,
			"linked_cels" : linked_cels,
		})

	var tag_data := []
	for tag in animation_tags:
		tag_data.append({
			"name" : tag.name,
			"color" : tag.color.to_html(),
			"from" : tag.from,
			"to" : tag.to,
		})

	var guide_data := []
	for guide in guides:
		if guide is SymmetryGuide:
			continue
		if !is_instance_valid(guide):
			continue
		var coords = guide.points[0].x
		if guide.type == Guide.Types.HORIZONTAL:
			coords = guide.points[0].y

		guide_data.append({"type" : guide.type, "pos" : coords})

	var frame_data := []
	for frame in frames:
		var cel_data := []
		for cel in frame.cels:
			cel_data.append({
				"opacity" : cel.opacity,
#				"image_data" : cel.image.get_data()
			})
		frame_data.append({
			"cels" : cel_data,
			"duration" : frame.duration
		})
	var brush_data := []
	for brush in brushes:
		brush_data.append({
			"size_x" : brush.get_size().x,
			"size_y" : brush.get_size().y
		})

	var project_data := {
		"pixelorama_version" : Global.current_version,
		"name" : name,
		"size_x" : size.x,
		"size_y" : size.y,
		"save_path" : OpenSave.current_save_paths[Global.projects.find(self)],
		"layers" : layer_data,
		"tags" : tag_data,
		"guides" : guide_data,
		"symmetry_points" : [x_symmetry_point, y_symmetry_point],
		"frames" : frame_data,
		"brushes" : brush_data,
		"export_directory_path" : directory_path,
		"export_file_name" : file_name,
		"export_file_format" : file_format,
		"fps" : fps
	}

	return project_data


func deserialize(dict : Dictionary) -> void:
	if dict.has("name"):
		name = dict.name
	if dict.has("size_x") and dict.has("size_y"):
		size.x = dict.size_x
		size.y = dict.size_y
		update_tile_mode_rects()
	if dict.has("save_path"):
		OpenSave.current_save_paths[Global.projects.find(self)] = dict.save_path
	if dict.has("frames"):
		var frame_i := 0
		for frame in dict.frames:
			var cels := []
			for cel in frame.cels:
				cels.append(Cel.new(Image.new(), cel.opacity))
			var duration := 1.0
			if frame.has("duration"):
				duration = frame.duration
			elif dict.has("frame_duration"):
				duration = dict.frame_duration[frame_i]

			frames.append(Frame.new(cels, duration))
			frame_i += 1

		if dict.has("layers"):
			var layer_i :=  0
			for saved_layer in dict.layers:
				var linked_cels := []
				for linked_cel_number in saved_layer.linked_cels:
					linked_cels.append(frames[linked_cel_number])
					frames[linked_cel_number].cels[layer_i].image = linked_cels[0].cels[layer_i].image
					frames[linked_cel_number].cels[layer_i].image_texture = linked_cels[0].cels[layer_i].image_texture
				var layer := Layer.new(saved_layer.name, saved_layer.visible, saved_layer.locked, HBoxContainer.new(), saved_layer.new_cels_linked, linked_cels)
				layers.append(layer)
				layer_i += 1
	if dict.has("tags"):
		for tag in dict.tags:
			animation_tags.append(AnimationTag.new(tag.name, Color(tag.color), tag.from, tag.to))
		self.animation_tags = animation_tags
	if dict.has("guides"):
		for g in dict.guides:
			var guide := Guide.new()
			guide.type = g.type
			if guide.type == Guide.Types.HORIZONTAL:
				guide.add_point(Vector2(-99999, g.pos))
				guide.add_point(Vector2(99999, g.pos))
			else:
				guide.add_point(Vector2(g.pos, -99999))
				guide.add_point(Vector2(g.pos, 99999))
			guide.has_focus = false
			guide.project = self
			Global.canvas.add_child(guide)
	if dict.has("symmetry_points"):
		x_symmetry_point = dict.symmetry_points[0]
		y_symmetry_point = dict.symmetry_points[1]
		x_symmetry_axis.points[0].y = floor(y_symmetry_point / 2 + 1)
		x_symmetry_axis.points[1].y = floor(y_symmetry_point / 2 + 1)
		y_symmetry_axis.points[0].x = floor(x_symmetry_point / 2 + 1)
		y_symmetry_axis.points[1].x = floor(x_symmetry_point / 2 + 1)
	if dict.has("export_directory_path"):
		directory_path = dict.export_directory_path
	if dict.has("export_file_name"):
		file_name = dict.export_file_name
	if dict.has("export_file_format"):
		file_format = dict.export_file_format
	if dict.has("fps"):
		fps = dict.fps


func name_changed(value : String) -> void:
	name = value
	Global.tabs.set_tab_title(Global.tabs.current_tab, name)


func size_changed(value : Vector2) -> void:
	size = value
	update_tile_mode_rects()


func frames_changed(value : Array) -> void:
	frames = value
	remove_cel_buttons()

	for frame_id in Global.frame_ids.get_children():
		Global.frame_ids.remove_child(frame_id)
		frame_id.queue_free()

	for i in range(layers.size() - 1, -1, -1):
		Global.frames_container.add_child(layers[i].frame_container)

	for j in range(frames.size()):
		var label := Label.new()
		label.rect_min_size.x = Global.animation_timeline.cel_size
		label.align = Label.ALIGN_CENTER
		label.text = str(j + 1)
		Global.frame_ids.add_child(label)

		for i in range(layers.size() - 1, -1, -1):
			var cel_button = load("res://src/UI/Timeline/CelButton.tscn").instance()
			cel_button.frame = j
			cel_button.layer = i
			cel_button.get_child(0).texture = frames[j].cels[i].image_texture

			layers[i].frame_container.add_child(cel_button)

	set_timeline_first_and_last_frames()


func layers_changed(value : Array) -> void:
	layers = value
	if Global.layers_changed_skip:
		Global.layers_changed_skip = false
		return

	for container in Global.layers_container.get_children():
		container.queue_free()

	remove_cel_buttons()

	for i in range(layers.size() - 1, -1, -1):
		var layer_container = load("res://src/UI/Timeline/LayerButton.tscn").instance()
		layer_container.i = i
		if layers[i].name == tr("Layer") + " 0":
			layers[i].name = tr("Layer") + " %s" % i

		Global.layers_container.add_child(layer_container)
		layer_container.label.text = layers[i].name
		layer_container.line_edit.text = layers[i].name

		Global.frames_container.add_child(layers[i].frame_container)
		for j in range(frames.size()):
			var cel_button = load("res://src/UI/Timeline/CelButton.tscn").instance()
			cel_button.frame = j
			cel_button.layer = i
			cel_button.get_child(0).texture = frames[j].cels[i].image_texture

			layers[i].frame_container.add_child(cel_button)

	var layer_button = Global.layers_container.get_child(Global.layers_container.get_child_count() - 1 - current_layer)
	layer_button.pressed = true
	self.current_frame = current_frame # Call frame_changed to update UI
	toggle_layer_buttons_layers()


func remove_cel_buttons() -> void:
	for container in Global.frames_container.get_children():
		for button in container.get_children():
			container.remove_child(button)
			button.queue_free()
		Global.frames_container.remove_child(container)


func frame_changed(value : int) -> void:
	Global.canvas.selection.move_content_confirm()
	current_frame = value
	Global.current_frame_mark_label.text = "%s/%s" % [str(current_frame + 1), frames.size()]

	for i in frames.size():
		var text_color := Color.white
		if Global.theme_type == Global.ThemeTypes.CARAMEL || Global.theme_type == Global.ThemeTypes.LIGHT:
			text_color = Color.black
		Global.frame_ids.get_child(i).add_color_override("font_color", text_color)
		for layer in layers: # De-select all the other frames
			if i < layer.frame_container.get_child_count():
				layer.frame_container.get_child(i).pressed = false

	# Select the new frame
	if current_frame < Global.frame_ids.get_child_count():
		Global.frame_ids.get_child(current_frame).add_color_override("font_color", Global.control.theme.get_color("Selected Color", "Label"))
	if layers and current_frame < layers[current_layer].frame_container.get_child_count():
		layers[current_layer].frame_container.get_child(current_frame).pressed = true

	Global.disable_button(Global.remove_frame_button, frames.size() == 1)
	Global.disable_button(Global.move_left_frame_button, frames.size() == 1 or current_frame == 0)
	Global.disable_button(Global.move_right_frame_button, frames.size() == 1 or current_frame == frames.size() - 1)

	if current_frame < frames.size():
		Global.layer_opacity_slider.value = frames[current_frame].cels[current_layer].opacity * 100
		Global.layer_opacity_spinbox.value = frames[current_frame].cels[current_layer].opacity * 100

	Global.canvas.update()
	Global.transparent_checker._ready() # To update the rect size


func layer_changed(value : int) -> void:
	Global.canvas.selection.move_content_confirm()
	current_layer = value

	for container in Global.layers_container.get_children():
		container.pressed = false

	if current_layer < Global.layers_container.get_child_count():
		var layer_button = Global.layers_container.get_child(Global.layers_container.get_child_count() - 1 - current_layer)
		layer_button.pressed = true

	toggle_layer_buttons_current_layer()

	yield(Global.get_tree().create_timer(0.01), "timeout")
	self.current_frame = current_frame # Call frame_changed to update UI


func toggle_layer_buttons_layers() -> void:
	if !layers:
		return
	if layers[current_layer].locked:
		Global.disable_button(Global.remove_layer_button, true)

	if layers.size() == 1:
		Global.disable_button(Global.remove_layer_button, true)
		Global.disable_button(Global.move_up_layer_button, true)
		Global.disable_button(Global.move_down_layer_button, true)
		Global.disable_button(Global.merge_down_layer_button, true)
	elif !layers[current_layer].locked:
		Global.disable_button(Global.remove_layer_button, false)


func toggle_layer_buttons_current_layer() -> void:
	if current_layer < layers.size() - 1:
		Global.disable_button(Global.move_up_layer_button, false)
	else:
		Global.disable_button(Global.move_up_layer_button, true)

	if current_layer > 0:
		Global.disable_button(Global.move_down_layer_button, false)
		Global.disable_button(Global.merge_down_layer_button, false)
	else:
		Global.disable_button(Global.move_down_layer_button, true)
		Global.disable_button(Global.merge_down_layer_button, true)

	if current_layer < layers.size():
		if layers[current_layer].locked:
			Global.disable_button(Global.remove_layer_button, true)
		else:
			if layers.size() > 1:
				Global.disable_button(Global.remove_layer_button, false)


func animation_tags_changed(value : Array) -> void:
	animation_tags = value
	for child in Global.tag_container.get_children():
		child.queue_free()

	for tag in animation_tags:
		var tag_base_size = Global.animation_timeline.cel_size + 3
		var tag_c : Container = load("res://src/UI/Timeline/AnimationTagUI.tscn").instance()
		Global.tag_container.add_child(tag_c)
		tag_c.tag = tag
		var tag_position : int = Global.tag_container.get_child_count() - 1
		Global.tag_container.move_child(tag_c, tag_position)
		tag_c.get_node("Label").text = tag.name
		tag_c.get_node("Label").modulate = tag.color
		tag_c.get_node("Line2D").default_color = tag.color

		tag_c.rect_position.x = (tag.from - 1) * tag_base_size + tag.from
		var tag_size : int = tag.to - tag.from
		tag_c.rect_min_size.x = (tag_size + 1) * tag_base_size
		tag_c.get_node("Line2D").points[2] = Vector2(tag_c.rect_min_size.x, 0)
		tag_c.get_node("Line2D").points[3] = Vector2(tag_c.rect_min_size.x, 32)

	set_timeline_first_and_last_frames()


func set_timeline_first_and_last_frames() -> void:
	# This is useful in case tags get modified DURING the animation is playing
	# otherwise, this code is useless in this context, since these values are being set
	# when the play buttons get pressed anyway
	Global.animation_timeline.first_frame = 0
	Global.animation_timeline.last_frame = frames.size() - 1
	if Global.play_only_tags:
		for tag in animation_tags:
			if current_frame + 1 >= tag.from && current_frame + 1 <= tag.to:
				Global.animation_timeline.first_frame = tag.from - 1
				Global.animation_timeline.last_frame = min(frames.size() - 1, tag.to - 1)


func has_changed_changed(value : bool) -> void:
	has_changed = value
	if value:
		Global.tabs.set_tab_title(Global.tabs.current_tab, name + "(*)")
	else:
		Global.tabs.set_tab_title(Global.tabs.current_tab, name)


func get_tile_mode_rect() -> Rect2:
	return tile_mode_rects[tile_mode]


func update_tile_mode_rects() -> void:
	tile_mode_rects.resize(Global.TileMode.size())
	tile_mode_rects[Global.TileMode.NONE] = Rect2(Vector2.ZERO, size)
	tile_mode_rects[Global.TileMode.BOTH] = Rect2(Vector2(-1, -1) * size, Vector2(3, 3) * size)
	tile_mode_rects[Global.TileMode.X_AXIS] = Rect2(Vector2(-1, 0) * size, Vector2(3, 1) * size)
	tile_mode_rects[Global.TileMode.Y_AXIS] = Rect2(Vector2(0, -1) * size, Vector2(1, 3) * size)


func is_empty() -> bool:
	return frames.size() == 1 and layers.size() == 1 and frames[0].cels[0].image.is_invisible() and animation_tags.size() == 0


func can_pixel_get_drawn(pixel : Vector2) -> bool:
	if pixel.x < 0 or pixel.y < 0 or pixel.x >= size.x or pixel.y >= size.y:
		return false
	var selection_position : Vector2 = Global.canvas.selection.big_bounding_rectangle.position
	if selection_position.x < 0:
		pixel.x -= selection_position.x
	if selection_position.y < 0:
		pixel.y -= selection_position.y
	if has_selection:
		return selection_bitmap.get_bit(pixel)
	else:
		return true


func invert_bitmap(bitmap : BitMap) -> void:
	for x in bitmap.get_size().x:
		for y in bitmap.get_size().y:
			var pos := Vector2(x, y)
			bitmap.set_bit(pos, !bitmap.get_bit(pos))


# Unexposed BitMap class function - https://github.com/godotengine/godot/blob/master/scene/resources/bit_map.cpp#L605
func resize_bitmap(bitmap : BitMap, new_size : Vector2) -> BitMap:
	if new_size == bitmap.get_size():
		return bitmap
	var new_bitmap := BitMap.new()
	new_bitmap.create(new_size)
	var lw = min(bitmap.get_size().x, new_size.x)
	var lh = min(bitmap.get_size().y, new_size.y)
	for x in lw:
		for y in lh:
			new_bitmap.set_bit(Vector2(x, y), bitmap.get_bit(Vector2(x, y)))

	return new_bitmap


# Unexposed BitMap class function - https://github.com/godotengine/godot/blob/master/scene/resources/bit_map.cpp#L622
func bitmap_to_image(bitmap : BitMap) -> Image:
	var image := Image.new()
	var width := bitmap.get_size().x
	var height := bitmap.get_size().y
	var square_size = max(width, height)
	image.create(square_size, square_size, false, Image.FORMAT_LA8)
	image.lock()
	for x in width:
		for y in height:
			var pos := Vector2(x, y)
			var color = Color(1, 1, 1, 1) if bitmap.get_bit(pos) else Color(0, 0, 0, 0)
			image.set_pixelv(pos, color)
	image.unlock()
	return image


func get_selection_rectangle(bitmap : BitMap = selection_bitmap) -> Rect2:
	if bitmap.get_true_bit_count() == 0:
		return Rect2()

	var minx := 0xFFFFFF
	var miny := 0xFFFFFF
	var maxx := -1
	var maxy := -1
	for j in bitmap.get_size().y:
		for i in bitmap.get_size().x:
			if !bitmap.get_bit(Vector2(i, j)):
				continue
			if i > maxx:
				maxx = i
			if j > maxy:
				maxy = j
			if i < minx:
				minx = i
			if j < miny:
				miny = j

	if maxx == -1:
		return Rect2()
	else:
		return Rect2(minx, miny, maxx - minx + 1, maxy - miny + 1)


func move_bitmap_values(bitmap : BitMap, move_offset := true) -> void:
	var selection_node = Global.canvas.selection
	var selection_position : Vector2 = selection_node.big_bounding_rectangle.position
	var selection_end : Vector2 = selection_node.big_bounding_rectangle.end

	var image : Image = bitmap_to_image(bitmap)
	var selection_rect := image.get_used_rect()
	var smaller_image := image.get_rect(selection_rect)
	image.lock()
	image.fill(Color(0))
	var dst := selection_position
	var x_diff = selection_end.x - size.x
	var y_diff = selection_end.y - size.y
	var nw = max(size.x, size.x + x_diff)
	var nh = max(size.y, size.y + y_diff)

	if selection_position.x < 0:
		nw -= selection_position.x
		if move_offset:
			self.selection_offset.x = selection_position.x
		dst.x = 0
	else:
		if move_offset:
			self.selection_offset.x = 0
	if selection_position.y < 0:
		nh -= selection_position.y
		if move_offset:
			self.selection_offset.y = selection_position.y
		dst.y = 0
	else:
		if move_offset:
			self.selection_offset.y = 0

	if nw <= image.get_size().x:
		nw = image.get_size().x
	if nh <= image.get_size().y:
		nh = image.get_size().y

	image.crop(nw, nh)
	image.blit_rect(smaller_image, Rect2(Vector2.ZERO, Vector2(nw, nh)), dst)
	bitmap.create_from_image_alpha(image)


func resize_bitmap_values(bitmap : BitMap, new_size : Vector2, flip_x : bool, flip_y : bool) -> BitMap:
	var selection_node = Global.canvas.selection
	var selection_position : Vector2 = selection_node.big_bounding_rectangle.position
	var dst := selection_position
	var new_bitmap_size := size
	new_bitmap_size.x = max(size.x, abs(selection_position.x) + new_size.x)
	new_bitmap_size.y = max(size.y, abs(selection_position.y) + new_size.y)
	var new_bitmap := BitMap.new()
	var image : Image = bitmap_to_image(bitmap)
	var selection_rect := image.get_used_rect()
	var smaller_image := image.get_rect(selection_rect)
	if selection_position.x <= 0:
		self.selection_offset.x = selection_position.x
		dst.x = 0
	if selection_position.y <= 0:
		self.selection_offset.y = selection_position.y
		dst.y = 0
	image.lock()
	image.fill(Color(0))
	smaller_image.resize(new_size.x, new_size.y, Image.INTERPOLATE_NEAREST)
	if flip_x:
		smaller_image.flip_x()
	if flip_y:
		smaller_image.flip_y()
	if new_bitmap_size != size:
		image.crop(new_bitmap_size.x, new_bitmap_size.y)
	image.blit_rect(smaller_image, Rect2(Vector2.ZERO, new_bitmap_size), dst)
	new_bitmap.create_from_image_alpha(image)

	return new_bitmap