Merge branch 'master' into jgrpp

# Conflicts:
#	src/autoreplace_gui.cpp
#	src/build_vehicle_gui.cpp
#	src/cheat_gui.cpp
#	src/company_gui.cpp
#	src/debug.cpp
#	src/engine_gui.h
#	src/error_gui.cpp
#	src/group_gui.cpp
#	src/industry_cmd.cpp
#	src/industry_gui.cpp
#	src/misc_gui.cpp
#	src/network/network_gui.cpp
#	src/newgrf.cpp
#	src/newgrf_debug_gui.cpp
#	src/newgrf_gui.cpp
#	src/order_gui.cpp
#	src/rail_gui.cpp
#	src/road_gui.cpp
#	src/saveload/saveload.cpp
#	src/screenshot_gui.cpp
#	src/sound/win32_s.cpp
#	src/statusbar_gui.cpp
#	src/strgen/strgen.cpp
#	src/table/newgrf_debug_data.h
#	src/timetable_gui.cpp
#	src/toolbar_gui.cpp
#	src/town_gui.cpp
#	src/vehicle_gui.cpp
#	src/video/sdl2_v.cpp
#	src/video/sdl_v.cpp
#	src/viewport.cpp

src/newgrf_act5.h

@@ -0,0 +1,31 @@
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** @file newgrf_act5.h Information about NewGRF Action 5. */
+
+#ifndef NEWGRF_ACT5_H
+#define NEWGRF_ACT5_H
+
+/** The type of action 5 type. */
+enum Action5BlockType {
+	A5BLOCK_FIXED,                ///< Only allow replacing a whole block of sprites. (TTDP compatible)
+	A5BLOCK_ALLOW_OFFSET,         ///< Allow replacing any subset by specifiing an offset.
+	A5BLOCK_INVALID,              ///< unknown/not-implemented type
+};
+
+/** Information about a single action 5 type. */
+struct Action5Type {
+	Action5BlockType block_type;  ///< How is this Action5 type processed?
+	SpriteID sprite_base;         ///< Load the sprites starting from this sprite.
+	uint16_t min_sprites;         ///< If the Action5 contains less sprites, the whole block will be ignored.
+	uint16_t max_sprites;         ///< If the Action5 contains more sprites, only the first max_sprites sprites will be used.
+	const char *name;             ///< Name for error messages.
+};
+
+std::span<const Action5Type> GetAction5Types();
+
+#endif /* NEWGRF_ACT5_H */