Replace "High-Res Display Scaling" with adjustable "Zoom" option

AATool/Configuration/MainConfig.cs

@@ -41,11 +41,20 @@ public class MainConfig : Config
                 {"High Contrast",  (Hex("000000"), Hex("FFFFFF"), Hex("FFFFFF"))}
             };
 
+            public static readonly Dictionary<string, double> DisplayScales = new ()
+            {
+                {"100%", 1 },
+                {"125%", 1.25 },
+                {"150%", 1.5 },
+                {"175%", 1.75 },
+                {"200%", 2 },
+            };
+
             private static Color Hex(string hex) => 
                 ColorHelper.TryGetHexColor(hex, out Color color) ? color : Color.White;
 
             [JsonProperty] public readonly Setting<int> FpsCap = new (60);
-            [JsonProperty] public readonly Setting<int> DisplayScale = new (1);
+            [JsonProperty] public readonly Setting<double> DisplayScale = new (1);
 
             [JsonProperty] public readonly Setting<bool> AllowUserResizing = new (false);
             [JsonProperty] public readonly Setting<bool> HideCompletedAdvancements = new (false);

AATool/UI/Screens/UIMainScreen.cs

@@ -321,7 +321,9 @@ protected override void ConstrainWindow()
                 RenderCache?.Dispose();
                 RenderCache = new RenderTarget2D(this.GraphicsDevice, width, height);
             }
-            this.Form.ClientSize = new System.Drawing.Size(width * Config.Main.DisplayScale, height * Config.Main.DisplayScale);
+            int clientWidth = Convert.ToInt32(Convert.ToDouble(width) * Config.Main.DisplayScale);
+            int clientHeight = Convert.ToInt32(Convert.ToDouble(height) * Config.Main.DisplayScale);
+            this.Form.ClientSize = new System.Drawing.Size(clientWidth, clientHeight);
 
             //snap window to user's preferred location
             if (!this.Positioned || Config.Main.StartupArrangement.Changed || Config.Main.StartupDisplay.Changed)

AATool/Winforms/Controls/CMainSettings.cs

@@ -35,7 +35,6 @@ public void LoadSettings()
             this.viewMode.Text          = Main.TextInfo.ToTitleCase(Config.Main.Layout.Value);
             this.hideBasic.Checked      = !Config.Main.ShowBasicAdvancements;
             this.ambientGlow.Checked    = Config.Main.ShowAmbientGlow;
-            this.highRes.Checked        = Config.Main.DisplayScale > 1;
             this.frameStyle.Text        = Config.Main.FrameStyle;
             this.progressBarStyle.Text  = Config.Main.ProgressBarStyle;
             this.refreshIcon.Text       = Config.Main.RefreshIcon;
@@ -51,6 +50,15 @@ public void LoadSettings()
             this.startupMonitor.SelectedIndex = MathHelper.Clamp(Config.Main.StartupDisplay - 1, 0, this.startupMonitor.Items.Count - 1);
             this.startupMonitor.Enabled = this.startupPosition.Text != "Remember";
 
+            // display scale
+            this.highRes.Items.Clear();
+            foreach (KeyValuePair<string, double> displayScale in Config.MainConfig.DisplayScales)
+            {
+                this.highRes.Items.Add(displayScale.Key);
+                if (Config.Main.DisplayScale == displayScale.Value)
+                    this.highRes.Text = displayScale.Key;
+            }
+
             //colors
             this.theme.Items.Clear();
             foreach (KeyValuePair<string, (Color, Color, Color)> theme in Config.MainConfig.Themes)
@@ -82,7 +90,6 @@ private void SaveSettings()
                 Config.Main.HideCompletedAdvancements.Set(this.hideCompletedAdvancements.Checked);
                 Config.Main.HideCompletedCriteria.Set(this.hideCompletedCriteria.Checked);
                 Config.Main.ShowAmbientGlow.Set(this.ambientGlow.Checked);
-                Config.Main.DisplayScale.Set(this.highRes.Checked ? 2 : 1);
                 Config.Main.Layout.Set(this.viewMode.Text.ToLower());
                 Config.Main.FrameStyle.Set(this.frameStyle.Text);
                 Config.Main.ProgressBarStyle.Set(this.progressBarStyle.Text);
@@ -342,6 +349,18 @@ private void OnIndexChanged(object sender, EventArgs e)
                     Config.Main.RainbowMode.Set(false);
                 }
             }
+            if (sender == this.highRes)
+            {
+                string displayScaleText = this.highRes.Text;
+                if (Config.MainConfig.DisplayScales.TryGetValue(displayScaleText, out double displayScale))
+                {
+                    Config.Main.DisplayScale.Set(displayScale);
+                }
+                else
+                {
+                    Config.Main.DisplayScale.Set(1);
+                }
+            }
             else if (sender == this.startupPosition)
             {
                 this.startupMonitor.Enabled = this.startupPosition.Text != "Remember";