added blend modes

autoload/blend_mode_manager.gd

@@ -0,0 +1,58 @@
+extends Node
+
+## Blend Mode Manager
+##
+## Manages blend mode constants and provides utility functions for 
+## working with blend modes in the PNGTuber application.
+
+## Blend mode constants
+enum BlendMode {
+	NORMAL = 0,
+	MULTIPLY = 1,
+	SCREEN = 2,
+	OVERLAY = 3,
+	SOFT_LIGHT = 4,
+	HARD_LIGHT = 5,
+	COLOR_DODGE = 6,
+	COLOR_BURN = 7,
+	DARKEN = 8,
+	LIGHTEN = 9,
+	ADD = 10,        # Linear Dodge
+	SUBTRACT = 11
+}
+
+## Returns an array of blend mode names for use in dropdowns
+static func get_blend_mode_names() -> Array:
+	return [
+		"Normal",
+		"Multiply", 
+		"Screen",
+		"Overlay",
+		"Soft Light",
+		"Hard Light",
+		"Color Dodge",
+		"Color Burn",
+		"Darken",
+		"Lighten",
+		"Add",
+		"Subtract"
+	]
+
+## Returns the string name for a given blend mode enum value
+static func get_blend_mode_name(mode: BlendMode) -> String:
+	var names = get_blend_mode_names()
+	if mode >= 0 and mode < names.size():
+		return names[mode]
+	return "Normal"
+
+## Returns the blend mode enum value for a given name
+static func get_blend_mode_from_name(name: String) -> BlendMode:
+	var names = get_blend_mode_names()
+	var index = names.find(name)
+	if index != -1:
+		return index as BlendMode
+	return BlendMode.NORMAL
+
+## Returns whether a blend mode is valid
+static func is_valid_blend_mode(mode: int) -> bool:
+	return mode >= BlendMode.NORMAL and mode <= BlendMode.SUBTRACT

autoload/blend_mode_manager.gd.uid

@@ -0,0 +1 @@
+uid://bm1aeoarbpp6b