From ae701a3bd8b163f4d02a5d5658831d451e0010ff Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Wed, 17 Jan 2024 23:59:53 +0000
Subject: [PATCH] Add scoped helper to temporarily override current blitter

---
 src/blitter/factory.hpp | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/blitter/factory.hpp b/src/blitter/factory.hpp
index e03d5f2934..fcf83d7f99 100644
--- a/src/blitter/factory.hpp
+++ b/src/blitter/factory.hpp
@@ -179,6 +179,21 @@ public:
 	 * Create an instance of this Blitter-class.
 	 */
 	virtual Blitter *CreateInstance() = 0;
+
+	/* Scoped temporary current blitter override */
+	struct TemporaryCurrentBlitterOverride {
+		Blitter *old_blitter;
+
+		TemporaryCurrentBlitterOverride(Blitter *new_blitter) : old_blitter(*GetActiveBlitter())
+		{
+			*GetActiveBlitter() = new_blitter;
+		}
+
+		~TemporaryCurrentBlitterOverride()
+		{
+			*GetActiveBlitter() = this->old_blitter;
+		}
+	};
 };
 
 extern std::string _ini_blitter;