Overhaul depth preview rendering:

* Replace Jet color map with grayscale
* Added Shift + \ hotkey to toggle preview
* Added Shift + [, Shift + ] hotkeys to change contrast
* Added Shift + ;, Shift + ' hotkeys to change offset

OpenRA.Mods.Common/Widgets/Logic/DepthPreviewHotkeysLogic.cs

@@ -0,0 +1,92 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2021 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version. For more
+ * information, see COPYING.
+ */
+#endregion
+
+using System.Collections.Generic;
+using OpenRA.Mods.Common.Lint;
+using OpenRA.Traits;
+using OpenRA.Widgets;
+
+namespace OpenRA.Mods.Common.Widgets.Logic
+{
+	[ChromeLogicArgsHotkeys("ToggleDepthPreviewKey",
+		"IncreaseDepthPreviewContrastKey", "DecreaseDepthPreviewContrastKey",
+		"IncreaseDepthPreviewOffsetKey", "DecreaseDepthPreviewOffsetKey")]
+	public class DepthPreviewHotkeysLogic : ChromeLogic
+	{
+		[ObjectCreator.UseCtor]
+		public DepthPreviewHotkeysLogic(Widget widget, World world, ModData modData, Dictionary<string, MiniYaml> logicArgs)
+		{
+			var debugVis = world.WorldActor.TraitOrDefault<DebugVisualizations>();
+
+			var toggleKey = new HotkeyReference();
+			if (logicArgs.TryGetValue("ToggleDepthPreviewKey", out var yaml))
+				toggleKey = modData.Hotkeys[yaml.Value];
+
+			var increaseContrastKey = new HotkeyReference();
+			if (logicArgs.TryGetValue("IncreaseDepthPreviewContrastKey", out yaml))
+				increaseContrastKey = modData.Hotkeys[yaml.Value];
+
+			var decreaseContrastKey = new HotkeyReference();
+			if (logicArgs.TryGetValue("DecreaseDepthPreviewContrastKey", out yaml))
+				decreaseContrastKey = modData.Hotkeys[yaml.Value];
+
+			var increaseOffsetKey = new HotkeyReference();
+			if (logicArgs.TryGetValue("IncreaseDepthPreviewOffsetKey", out yaml))
+				increaseOffsetKey = modData.Hotkeys[yaml.Value];
+
+			var decreaseOffsetKey = new HotkeyReference();
+			if (logicArgs.TryGetValue("DecreaseDepthPreviewOffsetKey", out yaml))
+				decreaseOffsetKey = modData.Hotkeys[yaml.Value];
+
+			var keyhandler = widget.Get<LogicKeyListenerWidget>("DEPTHPREVIEW_KEYHANDLER");
+			keyhandler.AddHandler(e =>
+			{
+				if (e.Event != KeyInputEvent.Down)
+					return false;
+
+				if (toggleKey.IsActivatedBy(e))
+				{
+					debugVis.DepthBuffer ^= true;
+					return true;
+				}
+
+				if (!debugVis.DepthBuffer)
+					return false;
+
+				if (decreaseOffsetKey.IsActivatedBy(e))
+				{
+					debugVis.DepthBufferOffset -= 0.05f;
+					return true;
+				}
+
+				if (increaseOffsetKey.IsActivatedBy(e))
+				{
+					debugVis.DepthBufferOffset += 0.05f;
+					return true;
+				}
+
+				if (increaseContrastKey.IsActivatedBy(e))
+				{
+					debugVis.DepthBufferContrast += 0.1f;
+					return true;
+				}
+
+				if (decreaseContrastKey.IsActivatedBy(e))
+				{
+					debugVis.DepthBufferContrast -= 0.1f;
+					return true;
+				}
+
+				return false;
+			});
+		}
+	}
+}