From 6725363052eca77abda380c0491bd87ba836919e Mon Sep 17 00:00:00 2001
From: James Groom <OSSYoshiRulz@gmail.com>
Date: Sat, 28 Oct 2023 02:35:27 +1000
Subject: [PATCH] Allow drawing on LuaPictureBoxes on multiple windows (fixes
 #3778)

fixes bb4ba2184, though it wasn't working correctly before that either
this whole thing needs deduping
---
 .../tools/Lua/Libraries/FormsLuaLibrary.cs    | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs b/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
index 2e44ba1124..bea94805a0 100644
--- a/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
+++ b/src/BizHawk.Client.EmuHawk/tools/Lua/Libraries/FormsLuaLibrary.cs
@@ -443,6 +443,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -474,6 +475,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -506,6 +508,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -538,6 +541,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -570,6 +574,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -602,6 +607,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -642,6 +648,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -682,6 +689,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -724,6 +732,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -767,6 +776,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -798,6 +808,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -844,6 +855,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -876,6 +888,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -908,6 +921,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -949,6 +963,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -991,6 +1006,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1023,6 +1039,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1062,6 +1079,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1103,6 +1121,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1147,6 +1166,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1191,6 +1211,7 @@ namespace BizHawk.Client.EmuHawk
 						return;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1223,6 +1244,7 @@ namespace BizHawk.Client.EmuHawk
 						return 0;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);
@@ -1256,6 +1278,7 @@ namespace BizHawk.Client.EmuHawk
 						return 0;
 					}
 					var match = form.Controls().FirstOrDefault(c => c.Handle == ptr);
+					if (match is null) return;
 					if (match is not LuaPictureBox control)
 					{
 						LogOutputCallback(ERR_MSG_CONTROL_NOT_LPB);