Load images as tilesets

src/Autoload/OpenSave.gd

@@ -835,6 +835,25 @@ func import_reference_image_from_image(image: Image) -> void:
 	reference_image_imported.emit()
 
 
+func open_image_as_tileset(
+	path: String, image: Image, horiz: int, vert: int, project := Global.current_project
+) -> void:
+	horiz = mini(horiz, image.get_size().x)
+	vert = mini(vert, image.get_size().y)
+	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_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)
+			)
+			cropped_image.convert(project.get_image_format())
+			tileset.add_tile(cropped_image, null, 2)
+	project.tilesets.append(tileset)
+
+
 func set_new_imported_tab(project: Project, path: String) -> void:
 	var prev_project_empty := Global.current_project.is_empty()
 	var prev_project_pos := Global.current_project_index

src/UI/Dialogs/ImportPreviewDialog.gd

@@ -11,7 +11,8 @@ enum ImageImportOptions {
 	NEW_REFERENCE_IMAGE,
 	PALETTE,
 	BRUSH,
-	PATTERN
+	PATTERN,
+	TILESET
 }
 enum BrushTypes { FILE, PROJECT, RANDOM }
 
@@ -75,6 +76,7 @@ func _on_ImportPreviewDialog_about_to_show() -> void:
 	import_option_button.add_item("New palette")
 	import_option_button.add_item("New brush")
 	import_option_button.add_item("New pattern")
+	import_option_button.add_item("Tileset")
 
 	# adding custom importers
 	for id in custom_importers.keys():
@@ -207,6 +209,10 @@ func _on_ImportPreviewDialog_confirmed() -> void:
 			var location := "Patterns".path_join(file_name_ext)
 			var dir := DirAccess.open(path.get_base_dir())
 			dir.copy(path, Global.home_data_directory.path_join(location))
+		elif current_import_option == ImageImportOptions.TILESET:
+			OpenSave.open_image_as_tileset(
+				path, image, spritesheet_horizontal, spritesheet_vertical
+			)
 
 		else:
 			if current_import_option in custom_importers.keys():
@@ -250,7 +256,11 @@ func synchronize() -> void:
 			dialog.at_layer_option.get_node("AtLayerOption") as OptionButton
 		)
 		# Sync properties (if any)
-		if id == ImageImportOptions.SPRITESHEET_TAB or id == ImageImportOptions.SPRITESHEET_LAYER:
+		if (
+			id == ImageImportOptions.SPRITESHEET_TAB
+			or id == ImageImportOptions.SPRITESHEET_LAYER
+			or id == ImageImportOptions.TILESET
+		):
 			var h_frames := spritesheet_options.find_child("HorizontalFrames") as SpinBox
 			var v_frames := spritesheet_options.find_child("VerticalFrames") as SpinBox
 			var d_h_frames := dialog.spritesheet_options.find_child("HorizontalFrames") as SpinBox
@@ -298,7 +308,7 @@ func _on_ImportOption_item_selected(id: ImageImportOptions) -> void:
 	_hide_all_options()
 	import_options.get_parent().visible = true
 
-	if id == ImageImportOptions.SPRITESHEET_TAB:
+	if id == ImageImportOptions.SPRITESHEET_TAB or id == ImageImportOptions.TILESET:
 		frame_size_label.visible = true
 		spritesheet_options.visible = true
 		texture_rect.get_child(0).visible = true
@@ -505,6 +515,7 @@ func _call_queue_redraw() -> void:
 	if (
 		current_import_option == ImageImportOptions.SPRITESHEET_TAB
 		or current_import_option == ImageImportOptions.SPRITESHEET_LAYER
+		or current_import_option == ImageImportOptions.TILESET
 	):
 		if smart_slice:
 			if is_instance_valid(sliced_rects) and not sliced_rects.rects.is_empty():

src/UI/Dialogs/ImportPreviewDialog.tscn

@@ -223,10 +223,9 @@ text = "Brush type:"
 [node name="BrushTypeOption" type="OptionButton" parent="VBoxContainer/ImportOptionsContainer/ImportOptions/NewBrushOptions/Type"]
 layout_mode = 2
 mouse_default_cursor_shape = 2
-item_count = 3
 selected = 0
+item_count = 3
 popup/item_0/text = "File brush"
-popup/item_0/id = 0
 popup/item_1/text = "Project brush"
 popup/item_1/id = 1
 popup/item_2/text = "Random brush"

src/UI/Timeline/NewTileMapLayerDialog.gd

@@ -41,5 +41,9 @@ func _on_about_to_popup() -> void:
 
 
 func _on_tileset_option_button_item_selected(index: int) -> void:
+	if index > 0:
+		var tileset := Global.current_project.tilesets[index - 1]
+		tileset_name_line_edit.text = tileset.name
+		tile_size_slider.value = tileset.tile_size
 	tileset_name_line_edit.editable = index == 0
 	tile_size_slider.editable = tileset_name_line_edit.editable