first commit

app/.gitignore

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+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/Assets/AssetStoreTools*
+
+# Visual Studio 2015 cache directory
+/.vs/
+
+# Autogenerated VS/MD/Consulo solution and project files
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+
+# Unity3D generated meta files
+*.pidb.meta
+
+# Unity3D Generated File On Crash Reports
+sysinfo.txt
+
+# Builds
+*.apk

app/Assets/iPhoneXSafeAreaDrawer/Editor/iPhoneXSafeAreaDrawer.cs

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+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace iPhoneXSafeAreaDrawerEditor
+{
+	[InitializeOnLoad]
+	public static class iPhoneXSafeAreaDrawer
+	{
+		private static Texture m_portraitImage;
+		private static Texture m_landscapeImage;
+		private static iPhoneXSafeAreaDrawerSettings m_settings;
+
+		private static Texture portraitImage
+		{
+			get
+			{
+				if ( m_portraitImage == null )
+				{
+					var guid = AssetDatabase
+						.FindAssets( "iPhoneXSafeAreaDrawer-portrait" )
+						.FirstOrDefault()
+					;
+
+					var path = AssetDatabase.GUIDToAssetPath( guid );
+
+					m_portraitImage = AssetDatabase.LoadAssetAtPath<Texture>( path );
+				}
+				return m_portraitImage;
+			}
+		}
+
+		private static Texture landscapeImage
+		{
+			get
+			{
+				if ( m_landscapeImage == null )
+				{
+					var guid = AssetDatabase
+						.FindAssets( "iPhoneXSafeAreaDrawer-landscape" )
+						.FirstOrDefault()
+					;
+
+					var path = AssetDatabase.GUIDToAssetPath( guid );
+
+					m_landscapeImage = AssetDatabase.LoadAssetAtPath<Texture>( path );
+				}
+				return m_landscapeImage;
+			}
+		}
+
+		private static iPhoneXSafeAreaDrawerSettings settings
+		{
+			get
+			{
+				if ( m_settings == null )
+				{
+					m_settings = AssetDatabase
+						.FindAssets( "t:iPhoneXSafeAreaDrawerSettings" )
+						.Select( c => AssetDatabase.GUIDToAssetPath( c ) )
+						.Select( c => AssetDatabase.LoadAssetAtPath<iPhoneXSafeAreaDrawerSettings>( c ) )
+						.FirstOrDefault()
+					;
+				}
+				return m_settings;
+			}
+		}
+
+		static iPhoneXSafeAreaDrawer()
+		{
+			// Unity エディタ起動時にゲームオブジェクトを生成する場合は
+			// 1 フレーム処理を遅らせる必要がある
+			EditorApplication.delayCall += Initialize;
+		}
+
+		private static void Initialize()
+		{
+			var obj = GameObject.Find( "OnGUIHandler" );
+
+			if ( obj == null )
+			{
+				obj = new GameObject( "OnGUIHandler", typeof( OnGUIHandler ) );
+				obj.hideFlags = HideFlags.DontSave | HideFlags.HideInHierarchy;
+			}
+
+			var handler = obj.GetComponent<OnGUIHandler>();
+			handler.mOnGUI = OnGUI;
+		}
+
+		private static void OnGUI()
+		{
+			if ( !settings.IsEnable ) return;
+
+			var img = settings.IsPortrait ? portraitImage : landscapeImage;
+			var pos = new Rect( 0, 0, Screen.width, Screen.height );
+			GUI.DrawTexture( pos, img );
+		}
+	}
+}

app/Assets/iPhoneXSafeAreaDrawer/Editor/iPhoneXSafeAreaDrawerSettings.asset

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+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 0
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: 2b4a4c2bb01403b4a86882fb3ac359e2, type: 3}
+  m_Name: iPhoneXSafeAreaDrawerSettings
+  m_EditorClassIdentifier: 
+  m_isEnable: 0
+  m_isPortrait: 0

app/Assets/iPhoneXSafeAreaDrawer/Scripts/OnGUIHandler.cs

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+using System;
+using UnityEngine;
+
+namespace iPhoneXSafeAreaDrawerEditor
+{
+	/// <summary>
+	/// OnGUI が呼び出されるタイミングでイベントを実行するコンポーネント
+	/// </summary>
+	[ExecuteInEditMode]
+	public sealed class OnGUIHandler : MonoBehaviour
+	{
+		public Action mOnGUI { private get; set; }
+
+		private void OnGUI()
+		{
+			mOnGUI?.Invoke();
+		}
+	}
+}