Add `MakeSdlRect` helper function for -Wnarrowing

Source/utils/sdl_geometry.h

@@ -0,0 +1,23 @@
+/**
+ * @file sdl_geometry.h
+ * Helpers for SDL geometry types
+ */
+#pragma once
+
+#include <SDL_version.h>
+
+#if SDL_VERSION_ATLEAST(2, 0, 0)
+#include <SDL_rect.h>
+#else
+#include <SDL_video.h>
+#endif
+
+/**
+ * @brief Same as constructing directly but avoids type conversion warnings.
+ */
+inline SDL_Rect MakeSdlRect(
+    decltype(SDL_Rect {}.x) x, decltype(SDL_Rect {}.y) y,
+    decltype(SDL_Rect {}.w) w, decltype(SDL_Rect {}.h) h)
+{
+	return SDL_Rect { x, y, w, h };
+}