Update to Godot 4

.gitignore

@@ -0,0 +1,2 @@
+# Godot-specific ignores
+.godot/

Main.gd

@@ -1,37 +1,26 @@
 extends Control
 
-const GIFExporter = preload("res://gdgifexporter/exporter.gd")
-const MedianCutQuantization = preload("res://gdgifexporter/quantization/median_cut.gd")
-const UniformQuantization = preload("res://gdgifexporter/quantization/uniform.gd")
+const GIFExporter := preload("res://gdgifexporter/exporter.gd")
+const MedianCutQuantization := preload("res://gdgifexporter/quantization/median_cut.gd")
+const UniformQuantization := preload("res://gdgifexporter/quantization/uniform.gd")
 
-var img1: Image
-var img2: Image
-var img3: Image
-var img4: Image
+var img1: Image = preload("res://imgs/colors2.png").get_image()
+var img2: Image = preload("res://imgs/colors.png").get_image()
+var img3: Image = preload("res://imgs/one_color.png").get_image()
+var img4: Image = preload("res://imgs/half_transparent.png").get_image()
 
-var export_thread: Thread = Thread.new()
-var timer: float = 0
-var should_count: bool = false
-var count_mutex: Mutex = Mutex.new()
-
-var imgs := []
+var export_thread := Thread.new()
+var timer := 0.0
+var should_count := false
+var count_mutex := Mutex.new()
 
 
 func _ready():
-	img1 = Image.new()
-	img2 = Image.new()
-	img3 = Image.new()
-	img4 = Image.new()
-	img1.load("res://imgs/colors2.png")
 	img1.convert(Image.FORMAT_RGBA8)
-	img2.load("res://imgs/colors.png")
 	img2.convert(Image.FORMAT_RGBA8)
-	img3.load("res://imgs/one_color.png")
 	img3.convert(Image.FORMAT_RGBA8)
-	img4.load("res://imgs/half_transparent.png")
 	img4.convert(Image.FORMAT_RGBA8)
-	var img_texture := ImageTexture.new()
-	img_texture.create_from_image(img1)
+	var img_texture := ImageTexture.create_from_image(img1)
 	$CenterContainer/VBoxContainer/TextureRect.texture = img_texture
 
 
@@ -50,7 +39,7 @@ func export_thread_method(_args: Dictionary):
 	count_mutex.lock()
 	should_count = true
 	count_mutex.unlock()
-	var exporter = GIFExporter.new(img1.get_width(), img1.get_height())
+	var exporter := GIFExporter.new(img1.get_width(), img1.get_height())
 	exporter.add_frame(img1, 1, MedianCutQuantization)
 	exporter.add_frame(img2, 1, MedianCutQuantization)
 	exporter.add_frame(img3, 1, MedianCutQuantization)
@@ -63,15 +52,14 @@ func export_thread_method(_args: Dictionary):
 	timer = 0
 	count_mutex.unlock()
 
-	var file: File = File.new()
-	file.open("user://result.gif", File.WRITE)
+	var file := FileAccess.open("user://result.gif", FileAccess.WRITE)
 	file.store_buffer(exporter.export_file_data())
 	file.close()
 
 
 func _on_Button_pressed():
 	if not should_count:
-		if export_thread.is_active():
+		if export_thread.is_started():
 			export_thread.wait_to_finish()
 		export_thread = Thread.new()
-		export_thread.start(self, "export_thread_method", {})
+		export_thread.start(export_thread_method.bind({}))

Main.tscn

@@ -1,42 +1,33 @@
-[gd_scene load_steps=2 format=2]
+[gd_scene load_steps=2 format=3 uid="uid://babsvfuef2pcq"]
 
-[ext_resource path="res://Main.gd" type="Script" id=1]
+[ext_resource type="Script" path="res://Main.gd" id="1"]
 
 [node name="Control" type="Control"]
+layout_mode = 3
+anchors_preset = 15
 anchor_right = 1.0
 anchor_bottom = 1.0
-script = ExtResource( 1 )
-__meta__ = {
-"_edit_use_anchors_": false
-}
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1")
 
 [node name="CenterContainer" type="CenterContainer" parent="."]
+layout_mode = 0
 anchor_right = 1.0
 anchor_bottom = 1.0
-__meta__ = {
-"_edit_use_anchors_": false
-}
 
 [node name="VBoxContainer" type="VBoxContainer" parent="CenterContainer"]
-margin_left = 491.0
-margin_top = 286.0
-margin_right = 532.0
-margin_bottom = 314.0
+layout_mode = 2
 alignment = 1
 
 [node name="Button" type="Button" parent="CenterContainer/VBoxContainer"]
-margin_right = 41.0
-margin_bottom = 20.0
+layout_mode = 2
 text = "Start"
 
 [node name="TextureRect" type="TextureRect" parent="CenterContainer/VBoxContainer"]
-margin_top = 24.0
-margin_right = 41.0
-margin_bottom = 24.0
+layout_mode = 2
 
 [node name="TextureRect2" type="TextureRect" parent="CenterContainer/VBoxContainer"]
-margin_top = 28.0
-margin_right = 41.0
-margin_bottom = 28.0
+layout_mode = 2
 
 [connection signal="pressed" from="CenterContainer/VBoxContainer/Button" to="." method="_on_Button_pressed"]

default_env.tres

@@ -1,7 +1,7 @@
-[gd_resource type="Environment" load_steps=2 format=2]
+[gd_resource type="Environment" load_steps=2 format=3 uid="uid://byyxtyx523h6k"]
 
-[sub_resource type="ProceduralSky" id=1]
+[sub_resource type="Sky" id="1"]
 
 [resource]
 background_mode = 2
-background_sky = SubResource( 1 )
+sky = SubResource("1")