fixup segfaulting editor, favoring display_context over game_board

Currently, the editor does not generate game_board objects, and
leaves the pointer resources::gameboard null. This commit makes
map_location, reports, and tod_manager, three things used in
editor mode, use the display_context pointer instead of the
game_board pointer. We also move a function to display_context,
which finds a const unit * to a visible unit at a hex.

projectfiles/CodeBlocks-SCons/wesnoth.cbp

@@ -191,6 +191,7 @@
 		<Unit filename="../../src/dialogs.hpp" />
 		<Unit filename="../../src/display.cpp" />
 		<Unit filename="../../src/display.hpp" />
+		<Unit filename="../../src/display_context.cpp" />
 		<Unit filename="../../src/display_context.hpp" />
 		<Unit filename="../../src/editor/action/action_base.hpp" />
 		<Unit filename="../../src/editor/action/action.cpp" />

projectfiles/CodeBlocks/wesnoth.cbp

@@ -229,6 +229,7 @@
 		<Unit filename="..\..\src\dialogs.hpp" />
 		<Unit filename="..\..\src\display.cpp" />
 		<Unit filename="..\..\src\display.hpp" />
+		<Unit filename="..\..\src\display_context.cpp" />
 		<Unit filename="..\..\src\display_context.hpp" />
 		<Unit filename="..\..\src\editor\action\action.cpp" />
 		<Unit filename="..\..\src\editor\action\action.hpp" />

projectfiles/VC9/wesnoth.vcproj

@@ -20052,6 +20052,10 @@
 			RelativePath="..\..\src\display.hpp"
 			>
 		</File>
+		<File
+			RelativePath="..\..\src\display_context.cpp"
+			>
+		</File>
 		<File
 			RelativePath="..\..\src\display_context.hpp"
 			>

src/CMakeLists.txt

@@ -916,6 +916,7 @@ set(libwesnoth-game_STAT_SRC
 	construct_dialog.cpp
 	cursor.cpp
 	display.cpp
+	display_context.cpp
 	events.cpp
 	font.cpp
 	format_time_summary.cpp

src/SConscript

@@ -75,6 +75,7 @@ libwesnoth_sources = Split("""
     construct_dialog.cpp
     cursor.cpp
     display.cpp
+    display_context.cpp
     events.cpp
     format_time_summary.cpp
     generic_event.cpp

src/display_context.cpp

@@ -0,0 +1,31 @@
+/*
+   Copyright (C) 2014 by Chris Beck <render787@gmail.com>
+   Part of the Battle for Wesnoth Project http://www.wesnoth.org/
+
+   This program 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; either version 2 of the License, or
+   (at your option) any later version.
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY.
+
+   See the COPYING file for more details.
+*/
+
+#include "display_context.hpp"
+
+#include "map.hpp"
+#include "map_location.hpp"
+#include "team.hpp"
+#include "unit.hpp"
+#include "unit_map.hpp"
+
+const unit * display_context::get_visible_unit(const map_location & loc, const team &current_team, bool see_all) const
+{
+	if (!map().on_board(loc)) return NULL;
+	const unit_map::const_iterator u = units().find(loc);
+	if (!u.valid() || !u->is_visible_to_team(current_team, map(), see_all)) {
+		return NULL;
+	}
+	return &*u;
+}

src/display_context.hpp

@@ -28,12 +28,17 @@ class team;
 class gamemap;
 class unit_map;
 
+class unit;
+struct map_location;
+
 class display_context {
 public:
 	virtual const std::vector<team> & teams() const = 0;
 	virtual const gamemap & map() const = 0;
 	virtual const unit_map & units() const = 0;
 
+	const unit * get_visible_unit(const map_location &loc, const team &current_team, bool see_all = false) const;
+
 	virtual ~display_context() {}
 };
 

src/map_location.cpp

@@ -24,8 +24,8 @@
 #include "map_location.hpp"
 
 #include "config.hpp"
+#include "display_context.hpp"
 #include "formula_string_utils.hpp"
-#include "game_board.hpp"
 #include "map.hpp"
 #include "resources.hpp"
 #include "gettext.hpp"
@@ -318,7 +318,7 @@ std::vector<map_location> parse_location_range(const std::string &x, const std::
 	std::vector<map_location> res;
 	const std::vector<std::string> xvals = utils::split(x);
 	const std::vector<std::string> yvals = utils::split(y);
-	const gamemap *map = & resources::gameboard->map();
+	const gamemap *map = & resources::disp_context->map();
 	assert(map);
 	int xmin = 1, xmax = map->w(), ymin = 1, ymax = map->h();
 	if (with_border) {

src/reports.cpp

@@ -16,6 +16,7 @@
 
 #include "actions/attack.hpp"
 #include "attack_prediction.hpp"
+#include "display_context.hpp"
 #include "editor/editor_controller.hpp"
 #include "editor/palette/terrain_palettes.hpp"
 #include "font.hpp"
@@ -123,14 +124,14 @@ namespace reports {
 
 static const unit *get_visible_unit()
 {
-	return resources::gameboard->get_visible_unit(resources::screen->displayed_unit_hex(),
+	return resources::disp_context->get_visible_unit(resources::screen->displayed_unit_hex(),
 		(*resources::teams)[resources::screen->viewing_team()],
 		resources::screen->show_everything());
 }
 
 static const unit *get_selected_unit()
 {
-	return resources::gameboard->get_visible_unit(resources::screen->selected_hex(),
+	return resources::disp_context->get_visible_unit(resources::screen->selected_hex(),
 		(*resources::teams)[resources::screen->viewing_team()],
 		resources::screen->show_everything());
 }
@@ -318,7 +319,7 @@ static config unit_status(const unit* u)
 	if (!u) return report();
 	config res;
 	map_location displayed_unit_hex = resources::screen->displayed_unit_hex();
-	if (resources::gameboard->map().on_board(displayed_unit_hex) && u->invisible(displayed_unit_hex)) {
+	if (resources::disp_context->map().on_board(displayed_unit_hex) && u->invisible(displayed_unit_hex)) {
 		add_status(res, "misc/invisible.png", N_("invisible: "),
 			N_("This unit is invisible. It cannot be seen or attacked by enemy units."));
 	}
@@ -528,8 +529,8 @@ static config unit_defense(const unit* u, const map_location& displayed_unit_hex
 	}
 
 	std::ostringstream str, tooltip;
-	const gamemap &map = resources::gameboard->map();
-	if(!resources::gameboard->map().on_board(displayed_unit_hex)) {
+	const gamemap &map = resources::disp_context->map();
+	if(!resources::disp_context->map().on_board(displayed_unit_hex)) {
 		return report();
 	}
 
@@ -617,7 +618,7 @@ static config unit_moves(const unit* u)
 		if (terrain == t_translation::FOGGED || terrain == t_translation::VOID_TERRAIN || terrain == t_translation::OFF_MAP_USER)
 			continue;
 
-		const terrain_type& info = resources::gameboard->map().get_terrain_info(terrain);
+		const terrain_type& info = resources::disp_context->map().get_terrain_info(terrain);
 
 		if (info.union_type().size() == 1 && info.union_type()[0] == info.number() && info.is_nonnull()) {
 
@@ -1199,7 +1200,7 @@ static config unit_box_at(const map_location& mouseover_hex)
 	else if (local_tod.bonus_modified < 0) local_tod_image += "~DARKEN()";
 	if (preferences::flip_time()) local_tod_image += "~FL(horiz)";
 
-	const gamemap &map = resources::gameboard->map();
+	const gamemap &map = resources::disp_context->map();
 	t_translation::t_terrain terrain = map.get_terrain(mouseover_hex);
 
 	//if (terrain == t_translation::OFF_MAP_USER)
@@ -1278,13 +1279,13 @@ REPORT_GENERATOR(villages)
 	str << td.villages << '/';
 	if (viewing_team.uses_shroud()) {
 		int unshrouded_villages = 0;
-		BOOST_FOREACH(const map_location &loc, resources::gameboard->map().villages()) {
+		BOOST_FOREACH(const map_location &loc, resources::disp_context->map().villages()) {
 			if (!viewing_team.shrouded(loc))
 				++unshrouded_villages;
 		}
 		str << unshrouded_villages;
 	} else {
-		str << resources::gameboard->map().villages().size();
+		str << resources::disp_context->map().villages().size();
 	}
 	return gray_inactive(str.str());
 }
@@ -1351,7 +1352,7 @@ void blit_tced_icon(config &cfg, const std::string &terrain_id, const std::strin
 
 REPORT_GENERATOR(terrain_info)
 {
-	const gamemap &map = resources::gameboard->map();
+	const gamemap &map = resources::disp_context->map();
 	map_location mouseover_hex = display::get_singleton()->mouseover_hex();
 
 	if (!map.on_board(mouseover_hex))
@@ -1397,7 +1398,7 @@ REPORT_GENERATOR(terrain_info)
 
 REPORT_GENERATOR(terrain)
 {
-	const gamemap &map = resources::gameboard->map();
+	const gamemap &map = resources::disp_context->map();
 	int viewing_side = resources::screen->viewing_side();
 	const team &viewing_team = (*resources::teams)[viewing_side - 1];
 	map_location mouseover_hex = resources::screen->mouseover_hex();
@@ -1446,7 +1447,7 @@ REPORT_GENERATOR(zoom_level)
 
 REPORT_GENERATOR(position)
 {
-	const gamemap &map = resources::gameboard->map();
+	const gamemap &map = resources::disp_context->map();
 	map_location mouseover_hex = resources::screen->mouseover_hex(),
 		displayed_unit_hex = resources::screen->displayed_unit_hex(),
 		selected_hex = resources::screen->selected_hex();

src/tod_manager.cpp

@@ -15,6 +15,7 @@
 #include "tod_manager.hpp"
 #include "wml_exception.hpp"
 #include "gettext.hpp"
+#include "display_context.hpp"
 #include "formula_string_utils.hpp"
 #include "gamestatus.hpp"
 #include "log.hpp"
@@ -194,7 +195,7 @@ const time_of_day& tod_manager::get_time_of_day(const map_location& loc, int n_t
 
 const time_of_day tod_manager::get_illuminated_time_of_day(const map_location& loc, int for_turn) const
 {
-	const gamemap& map = resources::gameboard->map();
+	const gamemap& map = resources::disp_context->map();
 	const unit_map& units = *resources::units;
 
 	// get ToD ignoring illumination