Use preload on the tool scenes again

This makes the initial app load time fast again, as it used to be before the tool logic changes. The code is uglier to read now but it's worth it.

Also optimize update_tool_cursors()

src/Autoload/Tools.gd

@@ -12,41 +12,85 @@ var alt := false
 var tools := {
 	"RectSelect":
 	Tool.new(
-		"RectSelect", "Rectangular Selection", "rectangle_select", "", [], "Tools/SelectionTools"
+		"RectSelect",
+		"Rectangular Selection",
+		"rectangle_select",
+		preload("res://src/Tools/SelectionTools/RectSelect.tscn")
 	),
 	"EllipseSelect":
 	Tool.new(
-		"EllipseSelect", "Elliptical Selection", "ellipse_select", "", [], "Tools/SelectionTools"
+		"EllipseSelect",
+		"Elliptical Selection",
+		"ellipse_select",
+		preload("res://src/Tools/SelectionTools/EllipseSelect.tscn")
 	),
 	"PolygonSelect":
 	Tool.new(
 		"PolygonSelect",
 		"Polygonal Selection",
 		"polygon_select",
-		"Double-click to connect the last point to the starting point",
-		[],
-		"Tools/SelectionTools"
+		preload("res://src/Tools/SelectionTools/PolygonSelect.tscn"),
+		"Double-click to connect the last point to the starting point"
 	),
 	"ColorSelect":
-	Tool.new("ColorSelect", "Select By Color", "color_select", "", [], "Tools/SelectionTools"),
-	"MagicWand": Tool.new("MagicWand", "Magic Wand", "magic_wand", "", [], "Tools/SelectionTools"),
-	"Lasso": Tool.new("Lasso", "Lasso / Free Select Tool", "lasso", "", [], "Tools/SelectionTools"),
-	"Move": Tool.new("Move", "Move", "move"),
-	"Zoom": Tool.new("Zoom", "Zoom", "zoom"),
-	"Pan": Tool.new("Pan", "Pan", "pan"),
+	Tool.new(
+		"ColorSelect",
+		"Select By Color",
+		"color_select",
+		preload("res://src/Tools/SelectionTools/ColorSelect.tscn")
+	),
+	"MagicWand":
+	Tool.new(
+		"MagicWand",
+		"Magic Wand",
+		"magic_wand",
+		preload("res://src/Tools/SelectionTools/MagicWand.tscn")
+	),
+	"Lasso":
+	Tool.new(
+		"Lasso",
+		"Lasso / Free Select Tool",
+		"lasso",
+		preload("res://src/Tools/SelectionTools/Lasso.tscn")
+	),
+	"Move": Tool.new("Move", "Move", "move", preload("res://src/Tools/Move.tscn")),
+	"Zoom": Tool.new("Zoom", "Zoom", "zoom", preload("res://src/Tools/Zoom.tscn")),
+	"Pan": Tool.new("Pan", "Pan", "pan", preload("res://src/Tools/Pan.tscn")),
 	"ColorPicker":
 	Tool.new(
-		"ColorPicker", "Color Picker", "colorpicker", "Select a color from a pixel of the sprite"
+		"ColorPicker",
+		"Color Picker",
+		"colorpicker",
+		preload("res://src/Tools/ColorPicker.tscn"),
+		"Select a color from a pixel of the sprite"
 	),
-	"Pencil": Tool.new("Pencil", "Pencil", "pencil", "Hold %s to make a line", ["Shift"]),
-	"Eraser": Tool.new("Eraser", "Eraser", "eraser", "Hold %s to make a line", ["Shift"]),
-	"Bucket": Tool.new("Bucket", "Bucket", "fill"),
-	"Shading": Tool.new("Shading", "Shading Tool", "shading"),
+	"Pencil":
+	Tool.new(
+		"Pencil",
+		"Pencil",
+		"pencil",
+		preload("res://src/Tools/Pencil.tscn"),
+		"Hold %s to make a line",
+		["Shift"]
+	),
+	"Eraser":
+	Tool.new(
+		"Eraser",
+		"Eraser",
+		"eraser",
+		preload("res://src/Tools/Eraser.tscn"),
+		"Hold %s to make a line",
+		["Shift"]
+	),
+	"Bucket": Tool.new("Bucket", "Bucket", "fill", preload("res://src/Tools/Bucket.tscn")),
+	"Shading":
+	Tool.new("Shading", "Shading Tool", "shading", preload("res://src/Tools/Shading.tscn")),
 	"LineTool":
 	Tool.new(
 		"LineTool",
 		"Line Tool",
 		"linetool",
+		preload("res://src/Tools/LineTool.tscn"),
 		"""Hold %s to snap the angle of the line
 Hold %s to center the shape on the click origin
 Hold %s to displace the shape's origin""",
@@ -57,6 +101,7 @@ Hold %s to displace the shape's origin""",
 		"RectangleTool",
 		"Rectangle Tool",
 		"rectangletool",
+		preload("res://src/Tools/RectangleTool.tscn"),
 		"""Hold %s to create a 1:1 shape
 Hold %s to center the shape on the click origin
 Hold %s to displace the shape's origin""",
@@ -67,6 +112,7 @@ Hold %s to displace the shape's origin""",
 		"EllipseTool",
 		"Ellipse Tool",
 		"ellipsetool",
+		preload("res://src/Tools/EllipseTool.tscn"),
 		"""Hold %s to create a 1:1 shape
 Hold %s to center the shape on the click origin
 Hold %s to displace the shape's origin""",
@@ -87,6 +133,7 @@ class Tool:
 	var display_name := ""
 	var scene: PackedScene
 	var icon: Texture
+	var cursor_icon: Texture
 	var shortcut := ""
 	var extra_hint := ""
 	var extra_shortcuts := []  # Array of String(s)
@@ -96,17 +143,18 @@ class Tool:
 		_name: String,
 		_display_name: String,
 		_shortcut: String,
+		_scene: PackedScene,
 		_extra_hint := "",
-		_extra_shortucts := [],
-		subdir := "Tools"
+		_extra_shortucts := []
 	) -> void:
 		name = _name
 		display_name = _display_name
 		shortcut = _shortcut
+		scene = _scene
 		extra_hint = _extra_hint
 		extra_shortcuts = _extra_shortucts
 		icon = load("res://assets/graphics/tools/%s.png" % name.to_lower())
-		scene = load("res://src/%s/%s.tscn" % [subdir, name])
+		cursor_icon = load("res://assets/graphics/tools/cursors/%s.png" % name.to_lower())
 
 	func generate_hint_tooltip() -> String:
 		var hint := display_name
@@ -301,17 +349,10 @@ func update_hint_tooltips() -> void:
 
 
 func update_tool_cursors() -> void:
-	var left_image = load(
-		"res://assets/graphics/tools/cursors/%s.png" % _slots[BUTTON_LEFT].tool_node.name.to_lower()
-	)
-	Global.left_cursor.texture = left_image
-	var right_image = load(
-		(
-			"res://assets/graphics/tools/cursors/%s.png"
-			% _slots[BUTTON_RIGHT].tool_node.name.to_lower()
-		)
-	)
-	Global.right_cursor.texture = right_image
+	var left_tool: Tool = tools[_slots[BUTTON_LEFT].tool_node.name]
+	Global.left_cursor.texture = left_tool.cursor_icon
+	var right_tool: Tool = tools[_slots[BUTTON_RIGHT].tool_node.name]
+	Global.right_cursor.texture = right_tool.cursor_icon
 
 
 func draw_indicator() -> void: