smallmap_gui.cpp

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/*
 * 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/>.
 */
 
#include "stdafx.h"
#include "core/backup_type.hpp"
#include "clear_map.h"
#include "industry.h"
#include "station_map.h"
#include "landscape.h"
#include "tree_map.h"
#include "viewport_func.h"
#include "town.h"
#include "tunnelbridge_map.h"
#include "core/endian_func.hpp"
#include "vehicle_base.h"
#include "sound_func.h"
#include "window_func.h"
#include "company_base.h"
#include "zoom_func.h"
#include "strings_func.h"
#include "blitter/factory.hpp"
#include "linkgraph/linkgraph_gui.h"
#include "timer/timer.h"
#include "timer/timer_window.h"
#include "smallmap_gui.h"
 
#include "widgets/smallmap_widget.h"
 
#include "table/strings.h"
 
#include <bitset>
 
#include "safeguards.h"
 
static int _smallmap_industry_count; 
static int _smallmap_company_count;  
static int _smallmap_cargo_count;    
 
struct LegendAndColour {
  uint8_t colour;            
  StringID legend;           
  IndustryType type;         
  uint8_t height;            
  CompanyID company;         
  bool show_on_map;          
  bool end;                  
  bool col_break;            
};
 
static uint8_t _linkstat_colours_in_legenda[] = {0, 1, 3, 5, 7, 9, 11};
 
static const int NUM_NO_COMPANY_ENTRIES = 4; 
 
#define MK(a, b) {a, b, INVALID_INDUSTRYTYPE, 0, INVALID_COMPANY, true, false, false}
 
#define MC(col_break)  {0, STR_TINY_BLACK_HEIGHT, INVALID_INDUSTRYTYPE, 0, INVALID_COMPANY, true, false, col_break}
 
#define MO(a, b) {a, b, INVALID_INDUSTRYTYPE, 0, INVALID_COMPANY, true, false, false}
 
#define MOEND() {0, 0, INVALID_INDUSTRYTYPE, 0, OWNER_NONE, true, true, false}
 
#define MKEND() {0, STR_NULL, INVALID_INDUSTRYTYPE, 0, INVALID_COMPANY, true, true, false}
 
#define MS(a, b) {a, b, INVALID_INDUSTRYTYPE, 0, INVALID_COMPANY, true, false, true}
 
static LegendAndColour _legend_land_contours[] = {
  MK(PC_BLACK,           STR_SMALLMAP_LEGENDA_ROADS),
  MK(PC_GREY,            STR_SMALLMAP_LEGENDA_RAILROADS),
  MK(PC_LIGHT_BLUE,      STR_SMALLMAP_LEGENDA_STATIONS_AIRPORTS_DOCKS),
  MK(PC_DARK_RED,        STR_SMALLMAP_LEGENDA_BUILDINGS_INDUSTRIES),
  MK(PC_WHITE,           STR_SMALLMAP_LEGENDA_VEHICLES),
 
  /* Placeholders for the colours and heights of the legend.
   * The following values are set at BuildLandLegend() based
   * on each colour scheme and the maximum map height. */
  MC(true),
  MC(false),
  MC(false),
  MC(false),
  MC(false),
  MC(false),
  MC(true),
  MC(false),
  MC(false),
  MC(false),
  MC(false),
  MC(false),
  MKEND()
};
 
static const LegendAndColour _legend_vehicles[] = {
  MK(PC_RED,             STR_SMALLMAP_LEGENDA_TRAINS),
  MK(PC_YELLOW,          STR_SMALLMAP_LEGENDA_ROAD_VEHICLES),
  MK(PC_LIGHT_BLUE,      STR_SMALLMAP_LEGENDA_SHIPS),
  MK(PC_WHITE,           STR_SMALLMAP_LEGENDA_AIRCRAFT),
 
  MS(PC_BLACK,           STR_SMALLMAP_LEGENDA_TRANSPORT_ROUTES),
  MK(PC_DARK_RED,        STR_SMALLMAP_LEGENDA_BUILDINGS_INDUSTRIES),
  MKEND()
};
 
static const LegendAndColour _legend_routes[] = {
  MK(PC_BLACK,           STR_SMALLMAP_LEGENDA_ROADS),
  MK(PC_GREY,            STR_SMALLMAP_LEGENDA_RAILROADS),
  MK(PC_DARK_RED,        STR_SMALLMAP_LEGENDA_BUILDINGS_INDUSTRIES),
 
  MS(PC_VERY_DARK_BROWN, STR_SMALLMAP_LEGENDA_RAILROAD_STATION),
  MK(PC_ORANGE,          STR_SMALLMAP_LEGENDA_TRUCK_LOADING_BAY),
  MK(PC_YELLOW,          STR_SMALLMAP_LEGENDA_BUS_STATION),
  MK(PC_RED,             STR_SMALLMAP_LEGENDA_AIRPORT_HELIPORT),
  MK(PC_LIGHT_BLUE,      STR_SMALLMAP_LEGENDA_DOCK),
  MKEND()
};
 
static const LegendAndColour _legend_vegetation[] = {
  MK(PC_ROUGH_LAND,      STR_SMALLMAP_LEGENDA_ROUGH_LAND),
  MK(PC_GRASS_LAND,      STR_SMALLMAP_LEGENDA_GRASS_LAND),
  MK(PC_BARE_LAND,       STR_SMALLMAP_LEGENDA_BARE_LAND),
  MK(PC_RAINFOREST,      STR_SMALLMAP_LEGENDA_RAINFOREST),
  MK(PC_FIELDS,          STR_SMALLMAP_LEGENDA_FIELDS),
  MK(PC_TREES,           STR_SMALLMAP_LEGENDA_TREES),
 
  MS(PC_GREEN,           STR_SMALLMAP_LEGENDA_FOREST),
  MK(PC_GREY,            STR_SMALLMAP_LEGENDA_ROCKS),
  MK(PC_ORANGE,          STR_SMALLMAP_LEGENDA_DESERT),
  MK(PC_LIGHT_BLUE,      STR_SMALLMAP_LEGENDA_SNOW),
  MK(PC_BLACK,           STR_SMALLMAP_LEGENDA_TRANSPORT_ROUTES),
  MK(PC_DARK_RED,        STR_SMALLMAP_LEGENDA_BUILDINGS_INDUSTRIES),
  MKEND()
};
 
static LegendAndColour _legend_land_owners[NUM_NO_COMPANY_ENTRIES + MAX_COMPANIES + 1] = {
  MO(PC_WATER,           STR_SMALLMAP_LEGENDA_WATER),
  MO(0x00,               STR_SMALLMAP_LEGENDA_NO_OWNER), // This colour will vary depending on settings.
  MO(PC_DARK_RED,        STR_SMALLMAP_LEGENDA_TOWNS),
  MO(PC_DARK_GREY,       STR_SMALLMAP_LEGENDA_INDUSTRIES),
  /* The legend will be terminated the first time it is used. */
  MOEND(),
};
 
#undef MK
#undef MC
#undef MS
#undef MO
#undef MOEND
#undef MKEND
 
static LegendAndColour _legend_linkstats[NUM_CARGO + lengthof(_linkstat_colours_in_legenda) + 1];
static LegendAndColour _legend_from_industries[NUM_INDUSTRYTYPES + 1];
static uint _industry_to_list_pos[NUM_INDUSTRYTYPES];
static uint16_t _industry_to_name_string_width[NUM_INDUSTRYTYPES];
static bool _smallmap_show_heightmap = false;
static IndustryType _smallmap_industry_highlight = INVALID_INDUSTRYTYPE;
static bool _smallmap_industry_highlight_state;
static uint _company_to_list_pos[MAX_COMPANIES];
 
void BuildIndustriesLegend()
{
  uint j = 0;
 
  /* Add each name */
  for (IndustryType ind : _sorted_industry_types) {
    const IndustrySpec *indsp = GetIndustrySpec(ind);
    if (indsp->enabled) {
      _legend_from_industries[j].legend = indsp->name;
      _legend_from_industries[j].colour = indsp->map_colour;
      _legend_from_industries[j].type = ind;
      _legend_from_industries[j].show_on_map = true;
      _legend_from_industries[j].col_break = false;
      _legend_from_industries[j].end = false;
 
      /* Store widget number for this industry type. */
      _industry_to_list_pos[ind] = j;
      j++;
    }
  }
  /* Terminate the list */
  _legend_from_industries[j].end = true;
 
  /* Store number of enabled industries */
  _smallmap_industry_count = j;
}
 
void BuildLinkStatsLegend()
{
  /* Clear the legend */
  memset(_legend_linkstats, 0, sizeof(_legend_linkstats));
 
  uint i = 0;
  for (; i < _sorted_cargo_specs.size(); ++i) {
    const CargoSpec *cs = _sorted_cargo_specs[i];
 
    _legend_linkstats[i].legend = cs->name;
    _legend_linkstats[i].colour = cs->legend_colour;
    _legend_linkstats[i].type = cs->Index();
    _legend_linkstats[i].show_on_map = true;
  }
 
  _legend_linkstats[i].col_break = true;
  _smallmap_cargo_count = i;
 
  for (; i < _smallmap_cargo_count + lengthof(_linkstat_colours_in_legenda); ++i) {
    _legend_linkstats[i].legend = STR_EMPTY;
    _legend_linkstats[i].colour = LinkGraphOverlay::LINK_COLOURS[_settings_client.gui.linkgraph_colours][_linkstat_colours_in_legenda[i - _smallmap_cargo_count]];
    _legend_linkstats[i].show_on_map = true;
  }
 
  _legend_linkstats[_smallmap_cargo_count].legend = STR_LINKGRAPH_LEGEND_UNUSED;
  _legend_linkstats[i - 1].legend = STR_LINKGRAPH_LEGEND_OVERLOADED;
  _legend_linkstats[(_smallmap_cargo_count + i - 1) / 2].legend = STR_LINKGRAPH_LEGEND_SATURATED;
  _legend_linkstats[i].end = true;
}
 
static const LegendAndColour * const _legend_table[] = {
  _legend_land_contours,
  _legend_vehicles,
  _legend_from_industries,
  _legend_linkstats,
  _legend_routes,
  _legend_vegetation,
  _legend_land_owners,
};
 
#define MKCOLOUR(x)         TO_LE32X(x)
 
#define MKCOLOUR_XXXX(x)    (MKCOLOUR(0x01010101) * (uint)(x))
#define MKCOLOUR_X0X0(x)    (MKCOLOUR(0x01000100) * (uint)(x))
#define MKCOLOUR_0X0X(x)    (MKCOLOUR(0x00010001) * (uint)(x))
#define MKCOLOUR_0XX0(x)    (MKCOLOUR(0x00010100) * (uint)(x))
#define MKCOLOUR_X00X(x)    (MKCOLOUR(0x01000001) * (uint)(x))
 
#define MKCOLOUR_XYXY(x, y) (MKCOLOUR_X0X0(x) | MKCOLOUR_0X0X(y))
#define MKCOLOUR_XYYX(x, y) (MKCOLOUR_X00X(x) | MKCOLOUR_0XX0(y))
 
#define MKCOLOUR_0000       MKCOLOUR_XXXX(0x00)
#define MKCOLOUR_0FF0       MKCOLOUR_0XX0(0xFF)
#define MKCOLOUR_F00F       MKCOLOUR_X00X(0xFF)
#define MKCOLOUR_FFFF       MKCOLOUR_XXXX(0xFF)
 
#include "table/heightmap_colours.h"
 
struct SmallMapColourScheme {
  std::vector<uint32_t> height_colours; 
  std::span<const uint32_t> height_colours_base; 
  uint32_t default_colour;             
};
 
static SmallMapColourScheme _heightmap_schemes[] = {
  {{}, _green_map_heights,      MKCOLOUR_XXXX(0x54)}, 
  {{}, _dark_green_map_heights, MKCOLOUR_XXXX(0x62)}, 
  {{}, _violet_map_heights,     MKCOLOUR_XXXX(0x81)}, 
};
 
void BuildLandLegend()
{
  /* The smallmap window has never been initialized, so no need to change the legend. */
  if (_heightmap_schemes[0].height_colours.empty()) return;
 
  /*
   * The general idea of this function is to fill the legend with an appropriate evenly spaced
   * selection of height levels. All entries with STR_TINY_BLACK_HEIGHT are reserved for this.
   * At the moment there are twelve of these.
   *
   * The table below defines up to which height level a particular delta in the legend should be
   * used. One could opt for just dividing the maximum height and use that as delta, but that
   * creates many "ugly" legend labels, e.g. once every 950 meter. As a result, this table will
   * reduce the number of deltas to 7: every 100m, 200m, 300m, 500m, 750m, 1000m and 1250m. The
   * deltas are closer together at the lower numbers because going from 12 entries to just 4, as
   * would happen when replacing 200m and 300m by 250m, would mean the legend would be short and
   * that might not be considered appropriate.
   *
   * The current method yields at least 7 legend entries and at most 12. It can be increased to
   * 8 by adding a 150m and 400m option, but especially 150m creates ugly heights.
   *
   * It tries to evenly space the legend items over the two columns that are there for the legend.
   */
 
  /* Table for delta; if max_height is less than the first column, use the second column as value. */
  uint deltas[][2] = { { 24, 2 }, { 48, 4 }, { 72, 6 }, { 120, 10 }, { 180, 15 }, { 240, 20 }, { MAX_TILE_HEIGHT + 1, 25 }};
  uint i = 0;
  for (; _settings_game.construction.map_height_limit >= deltas[i][0]; i++) {
    /* Nothing to do here. */
  }
  uint delta = deltas[i][1];
 
  int total_entries = (_settings_game.construction.map_height_limit / delta) + 1;
  int rows = CeilDiv(total_entries, 2);
  int j = 0;
 
  for (i = 0; i < lengthof(_legend_land_contours) - 1 && j < total_entries; i++) {
    if (_legend_land_contours[i].legend != STR_TINY_BLACK_HEIGHT) continue;
 
    _legend_land_contours[i].col_break = j % rows == 0;
    _legend_land_contours[i].end = false;
    _legend_land_contours[i].height = j * delta;
    _legend_land_contours[i].colour = _heightmap_schemes[_settings_client.gui.smallmap_land_colour].height_colours[j * delta];
    j++;
  }
  _legend_land_contours[i].end = true;
}
 
void BuildOwnerLegend()
{
  _legend_land_owners[1].colour = _heightmap_schemes[_settings_client.gui.smallmap_land_colour].default_colour;
 
  int i = NUM_NO_COMPANY_ENTRIES;
  for (const Company *c : Company::Iterate()) {
    _legend_land_owners[i].colour = GetColourGradient(c->colour, SHADE_LIGHT);
    _legend_land_owners[i].company = c->index;
    _legend_land_owners[i].show_on_map = true;
    _legend_land_owners[i].col_break = false;
    _legend_land_owners[i].end = false;
    _company_to_list_pos[c->index] = i;
    i++;
  }
 
  /* Terminate the list */
  _legend_land_owners[i].end = true;
 
  /* Store maximum amount of owner legend entries. */
  _smallmap_company_count = i;
}
 
struct AndOr {
  uint32_t mor;
  uint32_t mand;
};
 
static inline uint32_t ApplyMask(uint32_t colour, const AndOr *mask)
{
  return (colour & mask->mand) | mask->mor;
}
 
 
static const AndOr _smallmap_contours_andor[] = {
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_CLEAR
  {MKCOLOUR_0XX0(PC_GREY      ), MKCOLOUR_F00F}, // MP_RAILWAY
  {MKCOLOUR_0XX0(PC_BLACK     ), MKCOLOUR_F00F}, // MP_ROAD
  {MKCOLOUR_0XX0(PC_DARK_RED  ), MKCOLOUR_F00F}, // MP_HOUSE
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_TREES
  {MKCOLOUR_XXXX(PC_LIGHT_BLUE), MKCOLOUR_0000}, // MP_STATION
  {MKCOLOUR_XXXX(PC_WATER     ), MKCOLOUR_0000}, // MP_WATER
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_VOID
  {MKCOLOUR_XXXX(PC_DARK_RED  ), MKCOLOUR_0000}, // MP_INDUSTRY
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_TUNNELBRIDGE
  {MKCOLOUR_0XX0(PC_DARK_RED  ), MKCOLOUR_F00F}, // MP_OBJECT
  {MKCOLOUR_0XX0(PC_GREY      ), MKCOLOUR_F00F},
};
 
static const AndOr _smallmap_vehicles_andor[] = {
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_CLEAR
  {MKCOLOUR_0XX0(PC_BLACK     ), MKCOLOUR_F00F}, // MP_RAILWAY
  {MKCOLOUR_0XX0(PC_BLACK     ), MKCOLOUR_F00F}, // MP_ROAD
  {MKCOLOUR_0XX0(PC_DARK_RED  ), MKCOLOUR_F00F}, // MP_HOUSE
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_TREES
  {MKCOLOUR_0XX0(PC_BLACK     ), MKCOLOUR_F00F}, // MP_STATION
  {MKCOLOUR_XXXX(PC_WATER     ), MKCOLOUR_0000}, // MP_WATER
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_VOID
  {MKCOLOUR_XXXX(PC_DARK_RED  ), MKCOLOUR_0000}, // MP_INDUSTRY
  {MKCOLOUR_0000               , MKCOLOUR_FFFF}, // MP_TUNNELBRIDGE
  {MKCOLOUR_0XX0(PC_DARK_RED  ), MKCOLOUR_F00F}, // MP_OBJECT
  {MKCOLOUR_0XX0(PC_BLACK     ), MKCOLOUR_F00F},
};
 
static const uint8_t _tiletype_importance[] = {
  2, // MP_CLEAR
  8, // MP_RAILWAY
  7, // MP_ROAD
  5, // MP_HOUSE
  2, // MP_TREES
  9, // MP_STATION
  2, // MP_WATER
  1, // MP_VOID
  6, // MP_INDUSTRY
  8, // MP_TUNNELBRIDGE
  2, // MP_OBJECT
  0,
};
 
 
static inline uint32_t GetSmallMapContoursPixels(TileIndex tile, TileType t)
{
  const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
  return ApplyMask(cs->height_colours[TileHeight(tile)], &_smallmap_contours_andor[t]);
}
 
static inline uint32_t GetSmallMapVehiclesPixels(TileIndex, TileType t)
{
  const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
  return ApplyMask(cs->default_colour, &_smallmap_vehicles_andor[t]);
}
 
static inline uint32_t GetSmallMapIndustriesPixels(TileIndex tile, TileType t)
{
  const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
  return ApplyMask(_smallmap_show_heightmap ? cs->height_colours[TileHeight(tile)] : cs->default_colour, &_smallmap_vehicles_andor[t]);
}
 
static inline uint32_t GetSmallMapRoutesPixels(TileIndex tile, TileType t)
{
  switch (t) {
    case MP_STATION:
      switch (GetStationType(tile)) {
        case STATION_RAIL:    return MKCOLOUR_XXXX(PC_VERY_DARK_BROWN);
        case STATION_AIRPORT: return MKCOLOUR_XXXX(PC_RED);
        case STATION_TRUCK:   return MKCOLOUR_XXXX(PC_ORANGE);
        case STATION_BUS:     return MKCOLOUR_XXXX(PC_YELLOW);
        case STATION_DOCK:    return MKCOLOUR_XXXX(PC_LIGHT_BLUE);
        default:              return MKCOLOUR_FFFF;
      }
 
    case MP_RAILWAY: {
      AndOr andor = {
        MKCOLOUR_0XX0(GetRailTypeInfo(GetRailType(tile))->map_colour),
        _smallmap_contours_andor[t].mand
      };
 
      const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
      return ApplyMask(cs->default_colour, &andor);
    }
 
    case MP_ROAD: {
      const RoadTypeInfo *rti = nullptr;
      if (GetRoadTypeRoad(tile) != INVALID_ROADTYPE) {
        rti = GetRoadTypeInfo(GetRoadTypeRoad(tile));
      } else {
        rti = GetRoadTypeInfo(GetRoadTypeTram(tile));
      }
      if (rti != nullptr) {
        AndOr andor = {
          MKCOLOUR_0XX0(rti->map_colour),
          _smallmap_contours_andor[t].mand
        };
 
        const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
        return ApplyMask(cs->default_colour, &andor);
      }
      [[fallthrough]];
    }
 
    default:
      /* Ground colour */
      const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
      return ApplyMask(cs->default_colour, &_smallmap_contours_andor[t]);
  }
}
 
static inline uint32_t GetSmallMapLinkStatsPixels(TileIndex tile, TileType t)
{
  return _smallmap_show_heightmap ? GetSmallMapContoursPixels(tile, t) : GetSmallMapRoutesPixels(tile, t);
}
 
static const uint32_t _vegetation_clear_bits[] = {
  MKCOLOUR_XXXX(PC_GRASS_LAND), 
  MKCOLOUR_XXXX(PC_ROUGH_LAND), 
  MKCOLOUR_XXXX(PC_GREY),       
  MKCOLOUR_XXXX(PC_FIELDS),     
  MKCOLOUR_XXXX(PC_LIGHT_BLUE), 
  MKCOLOUR_XXXX(PC_ORANGE),     
  MKCOLOUR_XXXX(PC_GRASS_LAND), 
  MKCOLOUR_XXXX(PC_GRASS_LAND), 
};
 
static inline uint32_t GetSmallMapVegetationPixels(TileIndex tile, TileType t)
{
  switch (t) {
    case MP_CLEAR:
      if (IsClearGround(tile, CLEAR_GRASS)) {
        if (GetClearDensity(tile) < 3) return MKCOLOUR_XXXX(PC_BARE_LAND);
        if (GetTropicZone(tile) == TROPICZONE_RAINFOREST) return MKCOLOUR_XXXX(PC_RAINFOREST);
      }
      return _vegetation_clear_bits[GetClearGround(tile)];
 
    case MP_INDUSTRY:
      return IsTileForestIndustry(tile) ? MKCOLOUR_XXXX(PC_GREEN) : MKCOLOUR_XXXX(PC_DARK_RED);
 
    case MP_TREES:
      if (GetTreeGround(tile) == TREE_GROUND_SNOW_DESERT || GetTreeGround(tile) == TREE_GROUND_ROUGH_SNOW) {
        return (_settings_game.game_creation.landscape == LT_ARCTIC) ? MKCOLOUR_XYYX(PC_LIGHT_BLUE, PC_TREES) : MKCOLOUR_XYYX(PC_ORANGE, PC_TREES);
      }
      return (GetTropicZone(tile) == TROPICZONE_RAINFOREST) ? MKCOLOUR_XYYX(PC_RAINFOREST, PC_TREES) : MKCOLOUR_XYYX(PC_GRASS_LAND, PC_TREES);
 
    default:
      return ApplyMask(MKCOLOUR_XXXX(PC_GRASS_LAND), &_smallmap_vehicles_andor[t]);
  }
}
 
uint32_t GetSmallMapOwnerPixels(TileIndex tile, TileType t, IncludeHeightmap include_heightmap)
{
  Owner o;
 
  switch (t) {
    case MP_VOID:     return MKCOLOUR_XXXX(PC_BLACK);
    case MP_INDUSTRY: return MKCOLOUR_XXXX(PC_DARK_GREY);
    case MP_HOUSE:    return MKCOLOUR_XXXX(PC_DARK_RED);
    default:          o = GetTileOwner(tile); break;
    /* FIXME: For MP_ROAD there are multiple owners.
     * GetTileOwner returns the rail owner (level crossing) resp. the owner of ROADTYPE_ROAD (normal road),
     * even if there are no ROADTYPE_ROAD bits on the tile.
     */
  }
 
  if ((o < MAX_COMPANIES && !_legend_land_owners[_company_to_list_pos[o]].show_on_map) || o == OWNER_NONE || o == OWNER_WATER) {
    if (t == MP_WATER) return MKCOLOUR_XXXX(PC_WATER);
    const SmallMapColourScheme *cs = &_heightmap_schemes[_settings_client.gui.smallmap_land_colour];
    return ((include_heightmap == IncludeHeightmap::IfEnabled && _smallmap_show_heightmap) || include_heightmap == IncludeHeightmap::Always)
      ? cs->height_colours[TileHeight(tile)] : cs->default_colour;
  } else if (o == OWNER_TOWN) {
    return MKCOLOUR_XXXX(PC_DARK_RED);
  }
 
  return MKCOLOUR_XXXX(_legend_land_owners[_company_to_list_pos[o]].colour);
}
 
static const uint8_t _vehicle_type_colours[6] = {
  PC_RED, PC_YELLOW, PC_LIGHT_BLUE, PC_WHITE, PC_BLACK, PC_RED
};
 
enum SmallMapType : uint8_t {
  SMT_CONTOUR,
  SMT_VEHICLES,
  SMT_INDUSTRY,
  SMT_LINKSTATS,
  SMT_ROUTES,
  SMT_VEGETATION,
  SMT_OWNER,
};
DECLARE_ENUM_AS_ADDABLE(SmallMapType)
 
 
class SmallMapWindow : public Window {
protected:
  enum ZoomLevelChange {
    ZLC_INITIALIZE, 
    ZLC_ZOOM_OUT,   
    ZLC_ZOOM_IN,    
  };
 
  static SmallMapType map_type; 
  static bool show_towns;       
  static bool show_ind_names;   
  static int map_height_limit;  
 
  static const uint INDUSTRY_MIN_NUMBER_OF_COLUMNS = 2; 
 
  uint min_number_of_columns;    
  uint min_number_of_fixed_rows; 
  uint column_width;             
  uint legend_width;             
 
  int32_t scroll_x;  
  int32_t scroll_y;  
  int32_t subscroll; 
  int zoom;        
 
  std::unique_ptr<LinkGraphOverlay> overlay;
 
  static void BreakIndustryChainLink()
  {
    InvalidateWindowClassesData(WC_INDUSTRY_CARGOES, NUM_INDUSTRYTYPES);
  }
 
  static inline Point SmallmapRemapCoords(int x, int y)
  {
    Point pt;
    pt.x = (y - x) * 2;
    pt.y = y + x;
    return pt;
  }
 
  static inline void DrawVertMapIndicator(int x, int y, int y2)
  {
    GfxFillRect(x, y,      x, y + 3, PC_VERY_LIGHT_YELLOW);
    GfxFillRect(x, y2 - 3, x, y2,    PC_VERY_LIGHT_YELLOW);
  }
 
  static inline void DrawHorizMapIndicator(int x, int x2, int y)
  {
    GfxFillRect(x,      y, x + 3, y, PC_VERY_LIGHT_YELLOW);
    GfxFillRect(x2 - 3, y, x2,    y, PC_VERY_LIGHT_YELLOW);
  }
 
  inline uint GetMinLegendWidth() const
  {
    return WidgetDimensions::scaled.framerect.left + this->min_number_of_columns * this->column_width;
  }
 
  inline uint GetNumberColumnsLegend(uint width) const
  {
    return width / this->column_width;
  }
 
  inline uint GetLegendHeight(uint num_columns) const
  {
    return WidgetDimensions::scaled.framerect.Vertical() +
        this->GetNumberRowsLegend(num_columns) * GetCharacterHeight(FS_SMALL);
  }
 
  inline CompanyMask GetOverlayCompanyMask() const
  {
    return Company::IsValidID(_local_company) ? 1U << _local_company : MAX_UVALUE(CompanyMask);
  }
 
  IntervalTimer<TimerWindow> blink_interval = {std::chrono::milliseconds(450), [this](auto) {
    Blink();
  }};
 
  IntervalTimer<TimerWindow> refresh_interval = {std::chrono::milliseconds(930), [this](auto) {
    ForceRefresh();
  }};
 
  void RebuildColourIndexIfNecessary()
  {
    /* Rebuild colour indices if necessary. */
    if (SmallMapWindow::map_height_limit == _settings_game.construction.map_height_limit) return;
 
    for (auto &heightmap_scheme : _heightmap_schemes) {
      /* The heights go from 0 up to and including maximum. */
      size_t heights = _settings_game.construction.map_height_limit + 1;
      heightmap_scheme.height_colours.resize(heights);
 
      for (size_t z = 0; z < heights; z++) {
        size_t access_index = (heightmap_scheme.height_colours_base.size() * z) / heights;
 
        /* Choose colour by mapping the range (0..max heightlevel) on the complete colour table. */
        heightmap_scheme.height_colours[z] = heightmap_scheme.height_colours_base[access_index];
      }
    }
 
    SmallMapWindow::map_height_limit = _settings_game.construction.map_height_limit;
    BuildLandLegend();
  }
 
  uint GetNumberRowsLegend(uint columns) const
  {
    /* Reserve one column for link colours */
    uint num_rows_linkstats = CeilDiv(_smallmap_cargo_count, columns - 1);
    uint num_rows_others = CeilDiv(std::max(_smallmap_industry_count, _smallmap_company_count), columns);
    return std::max({this->min_number_of_fixed_rows, num_rows_linkstats, num_rows_others});
  }
 
  void SelectLegendItem(int click_pos, LegendAndColour *legend, int end_legend_item, int begin_legend_item = 0)
  {
    if (_ctrl_pressed) {
      /* Disable all, except the clicked one */
      bool changes = false;
      for (int i = begin_legend_item; i != end_legend_item; i++) {
        bool new_state = (i == click_pos);
        if (legend[i].show_on_map != new_state) {
          changes = true;
          legend[i].show_on_map = new_state;
        }
      }
      if (!changes) {
        /* Nothing changed? Then show all (again). */
        for (int i = begin_legend_item; i != end_legend_item; i++) {
          legend[i].show_on_map = true;
        }
      }
    } else {
      legend[click_pos].show_on_map = !legend[click_pos].show_on_map;
    }
 
    if (this->map_type == SMT_INDUSTRY) this->BreakIndustryChainLink();
  }
 
  void SwitchMapType(SmallMapType map_type)
  {
    this->RaiseWidget(WID_SM_CONTOUR + this->map_type);
    this->map_type = map_type;
    this->LowerWidget(WID_SM_CONTOUR + this->map_type);
 
    this->SetupWidgetData();
 
    if (map_type == SMT_LINKSTATS) this->overlay->SetDirty();
    if (map_type != SMT_INDUSTRY) this->BreakIndustryChainLink();
    this->ReInit();
  }
 
  void SetNewScroll(int sx, int sy, int sub)
  {
    const NWidgetBase *wi = this->GetWidget<NWidgetBase>(WID_SM_MAP);
    Point hv = InverseRemapCoords(wi->current_x * ZOOM_BASE * TILE_SIZE / 2, wi->current_y * ZOOM_BASE * TILE_SIZE / 2);
    hv.x *= this->zoom;
    hv.y *= this->zoom;
 
    if (sx < -hv.x) {
      sx = -hv.x;
      sub = 0;
    }
    if (sx > (int)(Map::MaxX() * TILE_SIZE) - hv.x) {
      sx = Map::MaxX() * TILE_SIZE - hv.x;
      sub = 0;
    }
    if (sy < -hv.y) {
      sy = -hv.y;
      sub = 0;
    }
    if (sy > (int)(Map::MaxY() * TILE_SIZE) - hv.y) {
      sy = Map::MaxY() * TILE_SIZE - hv.y;
      sub = 0;
    }
 
    this->scroll_x = sx;
    this->scroll_y = sy;
    this->subscroll = sub;
    if (this->map_type == SMT_LINKSTATS) this->overlay->SetDirty();
  }
 
  void DrawMapIndicators() const
  {
    /* Find main viewport. */
    const Viewport *vp = GetMainWindow()->viewport;
 
    Point upper_left_smallmap_coord  = InverseRemapCoords2(vp->virtual_left, vp->virtual_top);
    Point lower_right_smallmap_coord = InverseRemapCoords2(vp->virtual_left + vp->virtual_width - 1, vp->virtual_top + vp->virtual_height - 1);
 
    Point upper_left = this->RemapTile(upper_left_smallmap_coord.x / (int)TILE_SIZE, upper_left_smallmap_coord.y / (int)TILE_SIZE);
    upper_left.x -= this->subscroll;
 
    Point lower_right = this->RemapTile(lower_right_smallmap_coord.x / (int)TILE_SIZE, lower_right_smallmap_coord.y / (int)TILE_SIZE);
    lower_right.x -= this->subscroll;
 
    SmallMapWindow::DrawVertMapIndicator(upper_left.x, upper_left.y, lower_right.y);
    SmallMapWindow::DrawVertMapIndicator(lower_right.x, upper_left.y, lower_right.y);
 
    SmallMapWindow::DrawHorizMapIndicator(upper_left.x, lower_right.x, upper_left.y);
    SmallMapWindow::DrawHorizMapIndicator(upper_left.x, lower_right.x, lower_right.y);
  }
 
  void DrawSmallMapColumn(void *dst, uint xc, uint yc, int pitch, int reps, int start_pos, int end_pos, Blitter *blitter) const
  {
    void *dst_ptr_abs_end = blitter->MoveTo(_screen.dst_ptr, 0, _screen.height);
    uint min_xy = _settings_game.construction.freeform_edges ? 1 : 0;
 
    do {
      /* Check if the tile (xc,yc) is within the map range */
      if (xc >= Map::MaxX() || yc >= Map::MaxY()) continue;
 
      /* Check if the dst pointer points to a pixel inside the screen buffer */
      if (dst < _screen.dst_ptr) continue;
      if (dst >= dst_ptr_abs_end) continue;
 
      /* Construct tilearea covered by (xc, yc, xc + this->zoom, yc + this->zoom) such that it is within min_xy limits. */
      TileArea ta;
      if (min_xy == 1 && (xc == 0 || yc == 0)) {
        if (this->zoom == 1) continue; // The tile area is empty, don't draw anything.
 
        ta = TileArea(TileXY(std::max(min_xy, xc), std::max(min_xy, yc)), this->zoom - (xc == 0), this->zoom - (yc == 0));
      } else {
        ta = TileArea(TileXY(xc, yc), this->zoom, this->zoom);
      }
      ta.ClampToMap(); // Clamp to map boundaries (may contain MP_VOID tiles!).
 
      uint32_t val = this->GetTileColours(ta);
      uint8_t *val8 = (uint8_t *)&val;
      int idx = std::max(0, -start_pos);
      for (int pos = std::max(0, start_pos); pos < end_pos; pos++) {
        blitter->SetPixel(dst, idx, 0, val8[idx]);
        idx++;
      }
    /* Switch to next tile in the column */
    } while (xc += this->zoom, yc += this->zoom, dst = blitter->MoveTo(dst, pitch, 0), --reps != 0);
  }
 
  void DrawVehicles(const DrawPixelInfo *dpi, Blitter *blitter) const
  {
    for (const Vehicle *v : Vehicle::Iterate()) {
      if (v->type == VEH_EFFECT) continue;
      if (v->vehstatus & (VS_HIDDEN | VS_UNCLICKABLE)) continue;
 
      /* Remap into flat coordinates. */
      Point pt = this->RemapTile(v->x_pos / (int)TILE_SIZE, v->y_pos / (int)TILE_SIZE);
 
      int y = pt.y - dpi->top;
      if (!IsInsideMM(y, 0, dpi->height)) continue; // y is out of bounds.
 
      bool skip = false; // Default is to draw both pixels.
      int x = pt.x - this->subscroll - 3 - dpi->left; // Offset X coordinate.
      if (x < 0) {
        /* if x+1 is 0, that means we're on the very left edge,
         * and should thus only draw a single pixel */
        if (++x != 0) continue;
        skip = true;
      } else if (x >= dpi->width - 1) {
        /* Check if we're at the very right edge, and if so draw only a single pixel */
        if (x != dpi->width - 1) continue;
        skip = true;
      }
 
      /* Calculate pointer to pixel and the colour */
      uint8_t colour = (this->map_type == SMT_VEHICLES) ? _vehicle_type_colours[v->type] : PC_WHITE;
 
      /* And draw either one or two pixels depending on clipping */
      blitter->SetPixel(dpi->dst_ptr, x, y, colour);
      if (!skip) blitter->SetPixel(dpi->dst_ptr, x + 1, y, colour);
    }
  }
 
  void DrawTowns(const DrawPixelInfo *dpi, const int vertical_padding) const
  {
    for (const Town *t : Town::Iterate()) {
      /* Remap the town coordinate */
      Point pt = this->RemapTile(TileX(t->xy), TileY(t->xy));
      int x = pt.x - this->subscroll - (t->cache.sign.width_small >> 1);
      int y = pt.y + vertical_padding;
 
      /* Check if the town sign is within bounds */
      if (x + t->cache.sign.width_small > dpi->left &&
          x < dpi->left + dpi->width &&
          y + GetCharacterHeight(FS_SMALL) > dpi->top &&
          y < dpi->top + dpi->height) {
        /* And draw it. */
        SetDParam(0, t->index);
        DrawString(x, x + t->cache.sign.width_small, y, STR_SMALLMAP_TOWN);
      }
    }
  }
 
  void DrawIndustryNames(const DrawPixelInfo *dpi, const int vertical_padding) const
  {
    if (this->map_type != SMT_INDUSTRY) return;
 
    for (const Industry *i : Industry::Iterate()) {
      const LegendAndColour &tbl = _legend_from_industries[_industry_to_list_pos[i->type]];
      if (!tbl.show_on_map) continue;
 
      /* Industry names blink together with their blobs in the smallmap. */
      const bool is_blinking = i->type == _smallmap_industry_highlight && !_smallmap_industry_highlight_state;
      if (is_blinking) continue;
 
      if (_industry_to_name_string_width[i->type] == 0) {
        _industry_to_name_string_width[i->type] = GetStringBoundingBox(tbl.legend, FS_SMALL).width;
      }
      const uint16_t &legend_text_width = _industry_to_name_string_width[i->type];
 
      /* Remap the industry coordinate */
      const TileIndex &tile = i->location.GetCenterTile();
      const Point pt = this->RemapTile(TileX(tile), TileY(tile));
      const int x = pt.x - this->subscroll - (legend_text_width / 2);
      const int y = pt.y + vertical_padding;
 
      /* Check if the industry name is within bounds */
      if (x + legend_text_width > dpi->left &&
          x < dpi->left + dpi->width &&
          y + GetCharacterHeight(FS_SMALL) > dpi->top &&
          y < dpi->top + dpi->height) {
 
        /* And draw it. */
        DrawString(x, x + legend_text_width, y, tbl.legend, TC_WHITE, SA_LEFT, false, FS_SMALL);
      }
    }
  }
 
  void DrawSmallMap(DrawPixelInfo *dpi) const
  {
    Blitter *blitter = BlitterFactory::GetCurrentBlitter();
    AutoRestoreBackup dpi_backup(_cur_dpi, dpi);
 
    /* Clear it */
    GfxFillRect(dpi->left, dpi->top, dpi->left + dpi->width - 1, dpi->top + dpi->height - 1, PC_BLACK);
 
    /* Which tile is displayed at (dpi->left, dpi->top)? */
    int dx;
    Point tile = this->PixelToTile(dpi->left, dpi->top, &dx);
    int tile_x = this->scroll_x / (int)TILE_SIZE + tile.x;
    int tile_y = this->scroll_y / (int)TILE_SIZE + tile.y;
 
    void *ptr = blitter->MoveTo(dpi->dst_ptr, -dx - 4, 0);
    int x = - dx - 4;
    int y = 0;
 
    for (;;) {
      /* Distance from left edge */
      if (x >= -3) {
        if (x >= dpi->width) break; // Exit the loop.
 
        int end_pos = std::min(dpi->width, x + 4);
        int reps = (dpi->height - y + 1) / 2; // Number of lines.
        if (reps > 0) {
          this->DrawSmallMapColumn(ptr, tile_x, tile_y, dpi->pitch * 2, reps, x, end_pos, blitter);
        }
      }
 
      if (y == 0) {
        tile_y += this->zoom;
        y++;
        ptr = blitter->MoveTo(ptr, 0, 1);
      } else {
        tile_x -= this->zoom;
        y--;
        ptr = blitter->MoveTo(ptr, 0, -1);
      }
      ptr = blitter->MoveTo(ptr, 2, 0);
      x += 2;
    }
 
    /* Draw vehicles */
    if (this->map_type == SMT_CONTOUR || this->map_type == SMT_VEHICLES) this->DrawVehicles(dpi, blitter);
 
    /* Draw link stat overlay */
    if (this->map_type == SMT_LINKSTATS) this->overlay->Draw(dpi);
 
    const int map_labels_vertical_padding = ScaleGUITrad(2);
 
    /* Draw town names */
    if (this->show_towns) this->DrawTowns(dpi, map_labels_vertical_padding);
 
    /* Draw industry names */
    if (this->show_ind_names) this->DrawIndustryNames(dpi, map_labels_vertical_padding);
 
    /* Draw map indicators */
    this->DrawMapIndicators();
  }
 
  Point RemapTile(int tile_x, int tile_y) const
  {
    int x_offset = tile_x - this->scroll_x / (int)TILE_SIZE;
    int y_offset = tile_y - this->scroll_y / (int)TILE_SIZE;
 
    if (this->zoom == 1) return SmallmapRemapCoords(x_offset, y_offset);
 
    /* For negative offsets, round towards -inf. */
    if (x_offset < 0) x_offset -= this->zoom - 1;
    if (y_offset < 0) y_offset -= this->zoom - 1;
 
    return SmallmapRemapCoords(x_offset / this->zoom, y_offset / this->zoom);
  }
 
  Point PixelToTile(int px, int py, int *sub, bool add_sub = true) const
  {
    if (add_sub) px += this->subscroll;  // Total horizontal offset.
 
    /* For each two rows down, add a x and a y tile, and
     * For each four pixels to the right, move a tile to the right. */
    Point pt = {((py >> 1) - (px >> 2)) * this->zoom, ((py >> 1) + (px >> 2)) * this->zoom};
    px &= 3;
 
    if (py & 1) { // Odd number of rows, handle the 2 pixel shift.
      if (px < 2) {
        pt.x += this->zoom;
        px += 2;
      } else {
        pt.y += this->zoom;
        px -= 2;
      }
    }
 
    *sub = px;
    return pt;
  }
 
  Point ComputeScroll(int tx, int ty, int x, int y, int *sub) const
  {
    assert(x >= 0 && y >= 0);
 
    int new_sub;
    Point tile_xy = PixelToTile(x, y, &new_sub, false);
    tx -= tile_xy.x;
    ty -= tile_xy.y;
 
    Point scroll;
    if (new_sub == 0) {
      *sub = 0;
      scroll.x = (tx + this->zoom) * TILE_SIZE;
      scroll.y = (ty - this->zoom) * TILE_SIZE;
    } else {
      *sub = 4 - new_sub;
      scroll.x = (tx + 2 * this->zoom) * TILE_SIZE;
      scroll.y = (ty - 2 * this->zoom) * TILE_SIZE;
    }
    return scroll;
  }
 
  void SetZoomLevel(ZoomLevelChange change, const Point *zoom_pt)
  {
    static const int zoomlevels[] = {1, 2, 4, 6, 8}; // Available zoom levels. Bigger number means more zoom-out (further away).
    static const int MIN_ZOOM_INDEX = 0;
    static const int MAX_ZOOM_INDEX = lengthof(zoomlevels) - 1;
 
    int new_index, cur_index, sub;
    Point tile;
    switch (change) {
      case ZLC_INITIALIZE:
        cur_index = - 1; // Definitely different from new_index.
        new_index = MIN_ZOOM_INDEX;
        tile.x = tile.y = 0;
        break;
 
      case ZLC_ZOOM_IN:
      case ZLC_ZOOM_OUT:
        for (cur_index = MIN_ZOOM_INDEX; cur_index <= MAX_ZOOM_INDEX; cur_index++) {
          if (this->zoom == zoomlevels[cur_index]) break;
        }
        assert(cur_index <= MAX_ZOOM_INDEX);
 
        tile = this->PixelToTile(zoom_pt->x, zoom_pt->y, &sub);
        new_index = Clamp(cur_index + ((change == ZLC_ZOOM_IN) ? -1 : 1), MIN_ZOOM_INDEX, MAX_ZOOM_INDEX);
        break;
 
      default: NOT_REACHED();
    }
 
    if (new_index != cur_index) {
      this->zoom = zoomlevels[new_index];
      if (cur_index >= 0) {
        Point new_tile = this->PixelToTile(zoom_pt->x, zoom_pt->y, &sub);
        this->SetNewScroll(this->scroll_x + (tile.x - new_tile.x) * TILE_SIZE,
            this->scroll_y + (tile.y - new_tile.y) * TILE_SIZE, sub);
      } else if (this->map_type == SMT_LINKSTATS) {
        this->overlay->SetDirty();
      }
      this->SetWidgetDisabledState(WID_SM_ZOOM_IN,  this->zoom == zoomlevels[MIN_ZOOM_INDEX]);
      this->SetWidgetDisabledState(WID_SM_ZOOM_OUT, this->zoom == zoomlevels[MAX_ZOOM_INDEX]);
      this->SetDirty();
    }
  }
 
  void SetOverlayCargoMask()
  {
    CargoTypes cargo_mask = 0;
    for (int i = 0; i != _smallmap_cargo_count; ++i) {
      if (_legend_linkstats[i].show_on_map) SetBit(cargo_mask, _legend_linkstats[i].type);
    }
    this->overlay->SetCargoMask(cargo_mask);
  }
 
  void SetupWidgetData()
  {
    StringID legend_tooltip;
    StringID enable_all_tooltip;
    StringID disable_all_tooltip;
    int industry_names_select_plane;
    int select_buttons_plane;
    switch (this->map_type) {
      case SMT_INDUSTRY:
        legend_tooltip = STR_SMALLMAP_TOOLTIP_INDUSTRY_SELECTION;
        enable_all_tooltip = STR_SMALLMAP_TOOLTIP_ENABLE_ALL_INDUSTRIES;
        disable_all_tooltip = STR_SMALLMAP_TOOLTIP_DISABLE_ALL_INDUSTRIES;
        industry_names_select_plane = 0;
        select_buttons_plane = 0;
        break;
 
      case SMT_OWNER:
        legend_tooltip = STR_SMALLMAP_TOOLTIP_COMPANY_SELECTION;
        enable_all_tooltip = STR_SMALLMAP_TOOLTIP_ENABLE_ALL_COMPANIES;
        disable_all_tooltip = STR_SMALLMAP_TOOLTIP_DISABLE_ALL_COMPANIES;
        industry_names_select_plane = SZSP_NONE;
        select_buttons_plane = 0;
        break;
 
      case SMT_LINKSTATS:
        legend_tooltip = STR_SMALLMAP_TOOLTIP_CARGO_SELECTION;
        enable_all_tooltip = STR_SMALLMAP_TOOLTIP_ENABLE_ALL_CARGOS;
        disable_all_tooltip = STR_SMALLMAP_TOOLTIP_DISABLE_ALL_CARGOS;
        industry_names_select_plane = SZSP_NONE;
        select_buttons_plane = 0;
        break;
 
      default:
        legend_tooltip = STR_NULL;
        enable_all_tooltip = STR_NULL;
        disable_all_tooltip = STR_NULL;
        industry_names_select_plane = SZSP_NONE;
        select_buttons_plane = 1;
        break;
    }
 
    this->GetWidget<NWidgetCore>(WID_SM_LEGEND)->SetDataTip(STR_NULL, legend_tooltip);
    this->GetWidget<NWidgetCore>(WID_SM_ENABLE_ALL)->SetDataTip(STR_SMALLMAP_ENABLE_ALL, enable_all_tooltip);
    this->GetWidget<NWidgetCore>(WID_SM_DISABLE_ALL)->SetDataTip(STR_SMALLMAP_DISABLE_ALL, disable_all_tooltip);
    this->GetWidget<NWidgetStacked>(WID_SM_SHOW_IND_NAMES_SEL)->SetDisplayedPlane(industry_names_select_plane);
    this->GetWidget<NWidgetStacked>(WID_SM_SELECT_BUTTONS)->SetDisplayedPlane(select_buttons_plane);
  }
 
  uint32_t GetTileColours(const TileArea &ta) const
  {
    int importance = 0;
    TileIndex tile = INVALID_TILE; // Position of the most important tile.
    TileType et = MP_VOID;         // Effective tile type at that position.
 
    for (TileIndex ti : ta) {
      TileType ttype = GetTileType(ti);
 
      switch (ttype) {
        case MP_TUNNELBRIDGE: {
          TransportType tt = GetTunnelBridgeTransportType(ti);
 
          switch (tt) {
            case TRANSPORT_RAIL: ttype = MP_RAILWAY; break;
            case TRANSPORT_ROAD: ttype = MP_ROAD;    break;
            default:             ttype = MP_WATER;   break;
          }
          break;
        }
 
        case MP_INDUSTRY:
          /* Special handling of industries while in "Industries" smallmap view. */
          if (this->map_type == SMT_INDUSTRY) {
            /* If industry is allowed to be seen, use its colour on the map.
             * This has the highest priority above any value in _tiletype_importance. */
            IndustryType type = Industry::GetByTile(ti)->type;
            if (_legend_from_industries[_industry_to_list_pos[type]].show_on_map) {
              if (type == _smallmap_industry_highlight) {
                if (_smallmap_industry_highlight_state) return MKCOLOUR_XXXX(PC_WHITE);
              } else {
                return GetIndustrySpec(type)->map_colour * 0x01010101;
              }
            }
            /* Otherwise make it disappear */
            ttype = IsTileOnWater(ti) ? MP_WATER : MP_CLEAR;
          }
          break;
 
        default:
          break;
      }
 
      if (_tiletype_importance[ttype] > importance) {
        importance = _tiletype_importance[ttype];
        tile = ti;
        et = ttype;
      }
    }
 
    switch (this->map_type) {
      case SMT_CONTOUR:
        return GetSmallMapContoursPixels(tile, et);
 
      case SMT_VEHICLES:
        return GetSmallMapVehiclesPixels(tile, et);
 
      case SMT_INDUSTRY:
        return GetSmallMapIndustriesPixels(tile, et);
 
      case SMT_LINKSTATS:
        return GetSmallMapLinkStatsPixels(tile, et);
 
      case SMT_ROUTES:
        return GetSmallMapRoutesPixels(tile, et);
 
      case SMT_VEGETATION:
        return GetSmallMapVegetationPixels(tile, et);
 
      case SMT_OWNER:
        return GetSmallMapOwnerPixels(tile, et, IncludeHeightmap::IfEnabled);
 
      default: NOT_REACHED();
    }
  }
 
  int GetPositionOnLegend(Point pt)
  {
    const NWidgetBase *wi = this->GetWidget<NWidgetBase>(WID_SM_LEGEND);
    uint line = (pt.y - wi->pos_y - WidgetDimensions::scaled.framerect.top) / GetCharacterHeight(FS_SMALL);
    uint columns = this->GetNumberColumnsLegend(wi->current_x);
    uint number_of_rows = this->GetNumberRowsLegend(columns);
    if (line >= number_of_rows) return -1;
 
    bool rtl = _current_text_dir == TD_RTL;
    int x = pt.x - wi->pos_x;
    if (rtl) x = wi->current_x - x;
    uint column = (x - WidgetDimensions::scaled.framerect.left) / this->column_width;
 
    return (column * number_of_rows) + line;
  }
 
  void UpdateLinks()
  {
    if (this->map_type == SMT_LINKSTATS) {
      CompanyMask company_mask = this->GetOverlayCompanyMask();
      if (this->overlay->GetCompanyMask() != company_mask) {
        this->overlay->SetCompanyMask(company_mask);
      } else {
        this->overlay->SetDirty();
      }
    }
  }
 
  void Blink()
  {
    if (_smallmap_industry_highlight == INVALID_INDUSTRYTYPE) return;
 
    _smallmap_industry_highlight_state = !_smallmap_industry_highlight_state;
 
    this->UpdateLinks();
    this->SetDirty();
  }
 
  void ForceRefresh()
  {
    if (_smallmap_industry_highlight != INVALID_INDUSTRYTYPE) return;
 
    this->UpdateLinks();
    this->SetDirty();
  }
 
public:
  friend class NWidgetSmallmapDisplay;
 
  SmallMapWindow(WindowDesc &desc, int window_number) : Window(desc)
  {
    _smallmap_industry_highlight = INVALID_INDUSTRYTYPE;
    this->overlay = std::make_unique<LinkGraphOverlay>(this, WID_SM_MAP, 0, this->GetOverlayCompanyMask(), 1);
    this->CreateNestedTree();
    this->LowerWidget(WID_SM_CONTOUR + this->map_type);
 
    this->RebuildColourIndexIfNecessary();
 
    this->SetWidgetLoweredState(WID_SM_SHOW_HEIGHT, _smallmap_show_heightmap);
 
    this->SetWidgetLoweredState(WID_SM_TOGGLETOWNNAME, this->show_towns);
    this->SetWidgetLoweredState(WID_SM_SHOW_IND_NAMES, this->show_ind_names);
 
    this->SetupWidgetData();
    this->FinishInitNested(window_number);
 
    this->SetZoomLevel(ZLC_INITIALIZE, nullptr);
    this->SmallMapCenterOnCurrentPos();
    this->SetOverlayCargoMask();
  }
 
  void SmallMapCenterOnCurrentPos()
  {
    const Viewport *vp = GetMainWindow()->viewport;
    Point viewport_center = InverseRemapCoords2(vp->virtual_left + vp->virtual_width / 2, vp->virtual_top + vp->virtual_height / 2);
 
    int sub;
    const NWidgetBase *wid = this->GetWidget<NWidgetBase>(WID_SM_MAP);
    Point sxy = this->ComputeScroll(viewport_center.x / (int)TILE_SIZE, viewport_center.y / (int)TILE_SIZE,
        std::max(0, (int)wid->current_x / 2 - 2), wid->current_y / 2, &sub);
    this->SetNewScroll(sxy.x, sxy.y, sub);
    this->SetDirty();
  }
 
  Point GetStationMiddle(const Station *st) const
  {
    int x = CenterBounds(st->rect.left, st->rect.right, 0);
    int y = CenterBounds(st->rect.top, st->rect.bottom, 0);
    Point ret = this->RemapTile(x, y);
 
    /* Same magic 3 as in DrawVehicles; that's where I got it from.
     * No idea what it is, but without it the result looks bad.
     */
    ret.x -= 3 + this->subscroll;
    return ret;
  }
 
  void Close([[maybe_unused]] int data) override
  {
    this->BreakIndustryChainLink();
    this->Window::Close();
  }
 
  void SetStringParameters(WidgetID widget) const override
  {
    switch (widget) {
      case WID_SM_CAPTION:
        SetDParam(0, STR_SMALLMAP_TYPE_CONTOURS + this->map_type);
        break;
    }
  }
 
  void OnInit() override
  {
    uint min_width = 0;
    this->min_number_of_columns = INDUSTRY_MIN_NUMBER_OF_COLUMNS;
    this->min_number_of_fixed_rows = lengthof(_linkstat_colours_in_legenda);
    for (uint i = 0; i < lengthof(_legend_table); i++) {
      uint height = 0;
      uint num_columns = 1;
      for (const LegendAndColour *tbl = _legend_table[i]; !tbl->end; ++tbl) {
        StringID str;
        if (i == SMT_INDUSTRY) {
          SetDParam(0, tbl->legend);
          SetDParam(1, IndustryPool::MAX_SIZE);
          str = STR_SMALLMAP_INDUSTRY;
        } else if (i == SMT_LINKSTATS) {
          SetDParam(0, tbl->legend);
          str = STR_SMALLMAP_LINKSTATS;
        } else if (i == SMT_OWNER) {
          if (tbl->company != INVALID_COMPANY) {
            if (!Company::IsValidID(tbl->company)) {
              /* Rebuild the owner legend. */
              BuildOwnerLegend();
              this->OnInit();
              return;
            }
            /* Non-fixed legend entries for the owner view. */
            SetDParam(0, tbl->company);
            str = STR_SMALLMAP_COMPANY;
          } else {
            str = tbl->legend;
          }
        } else {
          if (tbl->col_break) {
            this->min_number_of_fixed_rows = std::max(this->min_number_of_fixed_rows, height);
            height = 0;
            num_columns++;
          }
          height++;
          str = tbl->legend;
        }
        min_width = std::max(GetStringBoundingBox(str).width, min_width);
      }
      this->min_number_of_fixed_rows = std::max(this->min_number_of_fixed_rows, height);
      this->min_number_of_columns = std::max(this->min_number_of_columns, num_columns);
    }
 
    /* Width of the legend blob. */
    this->legend_width = GetCharacterHeight(FS_SMALL) * 9 / 6;
 
    /* The width of a column is the minimum width of all texts + the size of the blob + some spacing */
    this->column_width = min_width + WidgetDimensions::scaled.hsep_normal + this->legend_width + WidgetDimensions::scaled.framerect.Horizontal();
 
    /* Cached string widths of industry names in the smallmap. Calculation is deferred to DrawIndustryNames(). */
    std::fill(std::begin(_industry_to_name_string_width), std::end(_industry_to_name_string_width), 0);
  }
 
  void OnPaint() override
  {
    if (this->map_type == SMT_OWNER) {
      for (const LegendAndColour *tbl = _legend_table[this->map_type]; !tbl->end; ++tbl) {
        if (tbl->company != INVALID_COMPANY && !Company::IsValidID(tbl->company)) {
          /* Rebuild the owner legend. */
          BuildOwnerLegend();
          this->InvalidateData(1);
          break;
        }
      }
    }
 
    this->DrawWidgets();
  }
 
  void DrawWidget(const Rect &r, WidgetID widget) const override
  {
    switch (widget) {
      case WID_SM_MAP: {
        Rect ir = r.Shrink(WidgetDimensions::scaled.bevel);
        DrawPixelInfo new_dpi;
        if (!FillDrawPixelInfo(&new_dpi, ir)) return;
        this->DrawSmallMap(&new_dpi);
        break;
      }
 
      case WID_SM_LEGEND: {
        uint columns = this->GetNumberColumnsLegend(r.Width());
        uint number_of_rows = this->GetNumberRowsLegend(columns);
        bool rtl = _current_text_dir == TD_RTL;
        uint i = 0; // Row counter for industry legend.
        uint row_height = GetCharacterHeight(FS_SMALL);
        int padding = ScaleGUITrad(1);
 
        Rect origin = r.WithWidth(this->column_width, rtl).Shrink(WidgetDimensions::scaled.framerect).WithHeight(row_height);
        Rect text = origin.Indent(this->legend_width + WidgetDimensions::scaled.hsep_normal, rtl);
        Rect icon = origin.WithWidth(this->legend_width, rtl).Shrink(0, padding, 0, 0);
 
        StringID string = STR_NULL;
        switch (this->map_type) {
          case SMT_INDUSTRY:
            string = STR_SMALLMAP_INDUSTRY;
            break;
          case SMT_LINKSTATS:
            string = STR_SMALLMAP_LINKSTATS;
            break;
          case SMT_OWNER:
            string = STR_SMALLMAP_COMPANY;
            break;
          default:
            break;
        }
 
        for (const LegendAndColour *tbl = _legend_table[this->map_type]; !tbl->end; ++tbl) {
          if (tbl->col_break || ((this->map_type == SMT_INDUSTRY || this->map_type == SMT_OWNER || this->map_type == SMT_LINKSTATS) && i++ >= number_of_rows)) {
            /* Column break needed, continue at top, COLUMN_WIDTH pixels
             * (one "row") to the right. */
            int x = rtl ? -(int)this->column_width : this->column_width;
            int y = origin.top - text.top;
            text = text.Translate(x, y);
            icon = icon.Translate(x, y);
            i = 1;
          }
 
          uint8_t legend_colour = tbl->colour;
 
          switch (this->map_type) {
            case SMT_INDUSTRY:
              /* Industry name must be formatted, since it's not in tiny font in the specs.
               * So, draw with a parameter and use the STR_SMALLMAP_INDUSTRY string, which is tiny font */
              SetDParam(0, tbl->legend);
              SetDParam(1, Industry::GetIndustryTypeCount(tbl->type));
              if (tbl->show_on_map && tbl->type == _smallmap_industry_highlight) {
                legend_colour = _smallmap_industry_highlight_state ? PC_WHITE : PC_BLACK;
              }
              [[fallthrough]];
 
            case SMT_LINKSTATS:
              SetDParam(0, tbl->legend);
              [[fallthrough]];
 
            case SMT_OWNER:
              if (this->map_type != SMT_OWNER || tbl->company != INVALID_COMPANY) {
                if (this->map_type == SMT_OWNER) SetDParam(0, tbl->company);
                if (!tbl->show_on_map) {
                  /* Simply draw the string, not the black border of the legend colour.
                   * This will enforce the idea of the disabled item */
                  DrawString(text, string, TC_GREY);
                } else {
                  DrawString(text, string, TC_BLACK);
                  GfxFillRect(icon, PC_BLACK); // Outer border of the legend colour
                }
                break;
              }
              [[fallthrough]];
 
            default:
              if (this->map_type == SMT_CONTOUR) SetDParam(0, tbl->height * TILE_HEIGHT_STEP);
              /* Anything that is not an industry or a company is using normal process */
              GfxFillRect(icon, PC_BLACK);
              DrawString(text, tbl->legend);
              break;
          }
          GfxFillRect(icon.Shrink(WidgetDimensions::scaled.bevel), legend_colour); // Legend colour
 
          text = text.Translate(0, row_height);
          icon = icon.Translate(0, row_height);
        }
      }
    }
  }
 
  void OnClick([[maybe_unused]] Point pt, WidgetID widget, [[maybe_unused]] int click_count) override
  {
    switch (widget) {
      case WID_SM_MAP: { // Map window
        if (click_count > 0) this->mouse_capture_widget = widget;
 
        const NWidgetBase *wid = this->GetWidget<NWidgetBase>(WID_SM_MAP);
        Window *w = GetMainWindow();
        int sub;
        pt = this->PixelToTile(pt.x - wid->pos_x, pt.y - wid->pos_y, &sub);
        ScrollWindowTo(this->scroll_x + pt.x * TILE_SIZE, this->scroll_y + pt.y * TILE_SIZE, -1, w);
 
        this->SetDirty();
        break;
      }
 
      case WID_SM_ZOOM_IN:
      case WID_SM_ZOOM_OUT: {
        const NWidgetBase *wid = this->GetWidget<NWidgetBase>(WID_SM_MAP);
        Point zoom_pt = { (int)wid->current_x / 2, (int)wid->current_y / 2};
        this->SetZoomLevel((widget == WID_SM_ZOOM_IN) ? ZLC_ZOOM_IN : ZLC_ZOOM_OUT, &zoom_pt);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        break;
      }
 
      case WID_SM_CONTOUR:    // Show land contours
      case WID_SM_VEHICLES:   // Show vehicles
      case WID_SM_INDUSTRIES: // Show industries
      case WID_SM_LINKSTATS:  // Show route map
      case WID_SM_ROUTES:     // Show transport routes
      case WID_SM_VEGETATION: // Show vegetation
      case WID_SM_OWNERS:     // Show land owners
        this->SwitchMapType((SmallMapType)(widget - WID_SM_CONTOUR));
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        break;
 
      case WID_SM_CENTERMAP: // Center the smallmap again
        this->SmallMapCenterOnCurrentPos();
        this->HandleButtonClick(WID_SM_CENTERMAP);
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        break;
 
      case WID_SM_TOGGLETOWNNAME: // Toggle town names
        this->show_towns = !this->show_towns;
        this->SetWidgetLoweredState(WID_SM_TOGGLETOWNNAME, this->show_towns);
 
        this->SetDirty();
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        break;
 
      case WID_SM_SHOW_IND_NAMES: // Toggle industry names
        this->show_ind_names = !this->show_ind_names;
        this->SetWidgetLoweredState(WID_SM_SHOW_IND_NAMES, this->show_ind_names);
 
        this->SetDirty();
        if (_settings_client.sound.click_beep) SndPlayFx(SND_15_BEEP);
        break;
 
      case WID_SM_LEGEND: // Legend
        if (this->map_type == SMT_INDUSTRY || this->map_type == SMT_LINKSTATS || this->map_type == SMT_OWNER) {
          int click_pos = this->GetPositionOnLegend(pt);
          if (click_pos < 0) break;
 
          /* If industry type small map*/
          if (this->map_type == SMT_INDUSTRY) {
            /* If click on industries label, find right industry type and enable/disable it. */
            if (click_pos < _smallmap_industry_count) {
              this->SelectLegendItem(click_pos, _legend_from_industries, _smallmap_industry_count);
            }
          } else if (this->map_type == SMT_LINKSTATS) {
            if (click_pos < _smallmap_cargo_count) {
              this->SelectLegendItem(click_pos, _legend_linkstats, _smallmap_cargo_count);
              this->SetOverlayCargoMask();
            }
          } else if (this->map_type == SMT_OWNER) {
            if (click_pos < _smallmap_company_count) {
              this->SelectLegendItem(click_pos, _legend_land_owners, _smallmap_company_count, NUM_NO_COMPANY_ENTRIES);
            }
          }
          this->SetDirty();
        }
        break;
 
      case WID_SM_ENABLE_ALL:
      case WID_SM_DISABLE_ALL: {
        LegendAndColour *tbl = nullptr;
        switch (this->map_type) {
          case SMT_INDUSTRY:
            tbl = _legend_from_industries;
            this->BreakIndustryChainLink();
            break;
          case SMT_OWNER:
            tbl = &(_legend_land_owners[NUM_NO_COMPANY_ENTRIES]);
            break;
          case SMT_LINKSTATS:
            tbl = _legend_linkstats;
            break;
          default:
            NOT_REACHED();
        }
        for (;!tbl->end && tbl->legend != STR_LINKGRAPH_LEGEND_UNUSED; ++tbl) {
          tbl->show_on_map = (widget == WID_SM_ENABLE_ALL);
        }
        if (this->map_type == SMT_LINKSTATS) this->SetOverlayCargoMask();
        this->SetDirty();
        break;
      }
 
      case WID_SM_SHOW_HEIGHT: // Enable/disable showing of heightmap.
        _smallmap_show_heightmap = !_smallmap_show_heightmap;
        this->SetWidgetLoweredState(WID_SM_SHOW_HEIGHT, _smallmap_show_heightmap);
        this->SetDirty();
        break;
    }
  }
 
  void OnInvalidateData(int data = 0, bool gui_scope = true) override
  {
    if (!gui_scope) return;
 
    switch (data) {
      case 1:
        /* The owner legend has already been rebuilt. */
        this->ReInit();
        break;
 
      case 0: {
        extern std::bitset<NUM_INDUSTRYTYPES> _displayed_industries;
        if (this->map_type != SMT_INDUSTRY) this->SwitchMapType(SMT_INDUSTRY);
 
        for (int i = 0; i != _smallmap_industry_count; i++) {
          _legend_from_industries[i].show_on_map = _displayed_industries.test(_legend_from_industries[i].type);
        }
        break;
      }
 
      case 2:
        this->RebuildColourIndexIfNecessary();
        break;
 
      default: NOT_REACHED();
    }
    this->SetDirty();
  }
 
  bool OnRightClick(Point, WidgetID widget) override
  {
    if (widget != WID_SM_MAP || _scrolling_viewport) return false;
 
    _scrolling_viewport = true;
    return true;
  }
 
  void OnMouseWheel(int wheel) override
  {
    if (_settings_client.gui.scrollwheel_scrolling != SWS_OFF) {
      const NWidgetBase *wid = this->GetWidget<NWidgetBase>(WID_SM_MAP);
      int cursor_x = _cursor.pos.x - this->left - wid->pos_x;
      int cursor_y = _cursor.pos.y - this->top  - wid->pos_y;
      if (IsInsideMM(cursor_x, 0, wid->current_x) && IsInsideMM(cursor_y, 0, wid->current_y)) {
        Point pt = {cursor_x, cursor_y};
        this->SetZoomLevel((wheel < 0) ? ZLC_ZOOM_IN : ZLC_ZOOM_OUT, &pt);
      }
    }
  }
 
  void OnScroll(Point delta) override
  {
    if (_settings_client.gui.scroll_mode == VSM_VIEWPORT_RMB_FIXED || _settings_client.gui.scroll_mode == VSM_MAP_RMB_FIXED) _cursor.fix_at = true;
 
    /* While tile is at (delta.x, delta.y)? */
    int sub;
    Point pt = this->PixelToTile(delta.x, delta.y, &sub);
    this->SetNewScroll(this->scroll_x + pt.x * TILE_SIZE, this->scroll_y + pt.y * TILE_SIZE, sub);
 
    this->SetDirty();
  }
 
  void OnMouseOver([[maybe_unused]] Point pt, WidgetID widget) override
  {
    IndustryType new_highlight = INVALID_INDUSTRYTYPE;
    if (widget == WID_SM_LEGEND && this->map_type == SMT_INDUSTRY) {
      int industry_pos = GetPositionOnLegend(pt);
      if (industry_pos >= 0 && industry_pos < _smallmap_industry_count) {
        new_highlight = _legend_from_industries[industry_pos].type;
      }
    }
    if (new_highlight != _smallmap_industry_highlight) {
      _smallmap_industry_highlight = new_highlight;
      _smallmap_industry_highlight_state = true;
      this->SetDirty();
    }
  }
 
};
 
SmallMapType SmallMapWindow::map_type = SMT_CONTOUR;
bool SmallMapWindow::show_towns = true;
bool SmallMapWindow::show_ind_names = false;
int SmallMapWindow::map_height_limit = -1;
 
class NWidgetSmallmapDisplay : public NWidgetContainer {
  const SmallMapWindow *smallmap_window; 
public:
  NWidgetSmallmapDisplay() : NWidgetContainer(NWID_VERTICAL)
  {
    this->smallmap_window = nullptr;
  }
 
  void SetupSmallestSize(Window *w) override
  {
    assert(this->children.size() == 2);
    NWidgetBase *display = this->children.front().get();
    NWidgetBase *bar = this->children.back().get();
 
    display->SetupSmallestSize(w);
    bar->SetupSmallestSize(w);
 
    this->smallmap_window = dynamic_cast<SmallMapWindow *>(w);
    assert(this->smallmap_window != nullptr);
    this->smallest_x = std::max(display->smallest_x, bar->smallest_x + smallmap_window->GetMinLegendWidth());
    this->smallest_y = display->smallest_y + std::max(bar->smallest_y, smallmap_window->GetLegendHeight(smallmap_window->min_number_of_columns));
    this->fill_x = std::max(display->fill_x, bar->fill_x);
    this->fill_y = (display->fill_y == 0 && bar->fill_y == 0) ? 0 : std::min(display->fill_y, bar->fill_y);
    this->resize_x = std::max(display->resize_x, bar->resize_x);
    this->resize_y = std::min(display->resize_y, bar->resize_y);
    this->ApplyAspectRatio();
  }
 
  void AssignSizePosition(SizingType sizing, int x, int y, uint given_width, uint given_height, bool rtl) override
  {
    this->pos_x = x;
    this->pos_y = y;
    this->current_x = given_width;
    this->current_y = given_height;
 
    assert(this->children.size() == 2);
    NWidgetBase *display = this->children.front().get();
    NWidgetBase *bar = this->children.back().get();
 
    if (sizing == ST_SMALLEST) {
      this->smallest_x = given_width;
      this->smallest_y = given_height;
      /* Make display and bar exactly equal to their minimal size. */
      display->AssignSizePosition(ST_SMALLEST, x, y, display->smallest_x, display->smallest_y, rtl);
      bar->AssignSizePosition(ST_SMALLEST, x, y + display->smallest_y, bar->smallest_x, bar->smallest_y, rtl);
    }
 
    uint bar_height = std::max(bar->smallest_y, this->smallmap_window->GetLegendHeight(this->smallmap_window->GetNumberColumnsLegend(given_width - bar->smallest_x)));
    uint display_height = given_height - bar_height;
    display->AssignSizePosition(ST_RESIZE, x, y, given_width, display_height, rtl);
    bar->AssignSizePosition(ST_RESIZE, x, y + display_height, given_width, bar_height, rtl);
  }
};
 
static constexpr NWidgetPart _nested_smallmap_display[] = {
  NWidget(WWT_PANEL, COLOUR_BROWN, WID_SM_MAP_BORDER),
    NWidget(WWT_INSET, COLOUR_BROWN, WID_SM_MAP), SetMinimalSize(346, 140), SetResize(1, 1), SetPadding(2, 2, 2, 2), EndContainer(),
  EndContainer(),
};
 
static constexpr NWidgetPart _nested_smallmap_bar[] = {
  NWidget(WWT_PANEL, COLOUR_BROWN),
    NWidget(NWID_HORIZONTAL),
      NWidget(WWT_EMPTY, INVALID_COLOUR, WID_SM_LEGEND), SetResize(1, 1),
      NWidget(NWID_VERTICAL),
        /* Top button row. */
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_SM_ZOOM_IN),
              SetDataTip(SPR_IMG_ZOOMIN, STR_TOOLBAR_TOOLTIP_ZOOM_THE_VIEW_IN), SetFill(1, 1),
          NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_SM_CENTERMAP),
              SetDataTip(SPR_IMG_SMALLMAP, STR_SMALLMAP_CENTER), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_BLANK),
              SetDataTip(SPR_EMPTY, STR_NULL), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_CONTOUR),
              SetDataTip(SPR_IMG_SHOW_COUNTOURS, STR_SMALLMAP_TOOLTIP_SHOW_LAND_CONTOURS_ON_MAP), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_VEHICLES),
              SetDataTip(SPR_IMG_SHOW_VEHICLES, STR_SMALLMAP_TOOLTIP_SHOW_VEHICLES_ON_MAP), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_INDUSTRIES),
              SetDataTip(SPR_IMG_INDUSTRY, STR_SMALLMAP_TOOLTIP_SHOW_INDUSTRIES_ON_MAP), SetFill(1, 1),
        EndContainer(),
        /* Bottom button row. */
        NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
          NWidget(WWT_PUSHIMGBTN, COLOUR_BROWN, WID_SM_ZOOM_OUT),
              SetDataTip(SPR_IMG_ZOOMOUT, STR_TOOLBAR_TOOLTIP_ZOOM_THE_VIEW_OUT), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_TOGGLETOWNNAME),
              SetDataTip(SPR_IMG_TOWN, STR_SMALLMAP_TOOLTIP_TOGGLE_TOWN_NAMES_ON_OFF), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_LINKSTATS),
              SetDataTip(SPR_IMG_CARGOFLOW, STR_SMALLMAP_TOOLTIP_SHOW_LINK_STATS_ON_MAP), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_ROUTES),
              SetDataTip(SPR_IMG_SHOW_ROUTES, STR_SMALLMAP_TOOLTIP_SHOW_TRANSPORT_ROUTES_ON), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_VEGETATION),
              SetDataTip(SPR_IMG_PLANTTREES, STR_SMALLMAP_TOOLTIP_SHOW_VEGETATION_ON_MAP), SetFill(1, 1),
          NWidget(WWT_IMGBTN, COLOUR_BROWN, WID_SM_OWNERS),
              SetDataTip(SPR_IMG_COMPANY_GENERAL, STR_SMALLMAP_TOOLTIP_SHOW_LAND_OWNERS_ON_MAP), SetFill(1, 1),
        EndContainer(),
        NWidget(NWID_SPACER), SetResize(0, 1),
      EndContainer(),
    EndContainer(),
  EndContainer(),
};
 
static std::unique_ptr<NWidgetBase> SmallMapDisplay()
{
  std::unique_ptr<NWidgetBase> map_display = std::make_unique<NWidgetSmallmapDisplay>();
 
  map_display = MakeNWidgets(_nested_smallmap_display, std::move(map_display));
  map_display = MakeNWidgets(_nested_smallmap_bar, std::move(map_display));
  return map_display;
}
 
static constexpr NWidgetPart _nested_smallmap_widgets[] = {
  NWidget(NWID_HORIZONTAL),
    NWidget(WWT_CLOSEBOX, COLOUR_BROWN),
    NWidget(WWT_CAPTION, COLOUR_BROWN, WID_SM_CAPTION), SetDataTip(STR_SMALLMAP_CAPTION, STR_TOOLTIP_WINDOW_TITLE_DRAG_THIS),
    NWidget(WWT_SHADEBOX, COLOUR_BROWN),
    NWidget(WWT_DEFSIZEBOX, COLOUR_BROWN),
    NWidget(WWT_STICKYBOX, COLOUR_BROWN),
  EndContainer(),
  NWidgetFunction(SmallMapDisplay), // Smallmap display and legend bar + image buttons.
  /* Bottom button row and resize box. */
  NWidget(NWID_HORIZONTAL),
    NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SM_SELECT_BUTTONS),
      NWidget(NWID_HORIZONTAL, NC_EQUALSIZE),
        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_SM_ENABLE_ALL), SetDataTip(STR_SMALLMAP_ENABLE_ALL, STR_NULL),
        NWidget(WWT_PUSHTXTBTN, COLOUR_BROWN, WID_SM_DISABLE_ALL), SetDataTip(STR_SMALLMAP_DISABLE_ALL, STR_NULL),
        NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_SM_SHOW_HEIGHT), SetDataTip(STR_SMALLMAP_SHOW_HEIGHT, STR_SMALLMAP_TOOLTIP_SHOW_HEIGHT),
 
        /* 'show industry names' button and container. Only shown for the industry map type. */
        NWidget(NWID_SELECTION, INVALID_COLOUR, WID_SM_SHOW_IND_NAMES_SEL),
          NWidget(WWT_TEXTBTN, COLOUR_BROWN, WID_SM_SHOW_IND_NAMES), SetDataTip(STR_SMALLMAP_SHOW_INDUSTRY_NAMES, STR_SMALLMAP_TOOLTIP_SHOW_INDUSTRY_NAMES),
        EndContainer(),
 
        NWidget(WWT_PANEL, COLOUR_BROWN), SetFill(1, 0), SetResize(1, 0),
        EndContainer(),
      EndContainer(),
      NWidget(WWT_PANEL, COLOUR_BROWN), SetFill(1, 0), SetResize(1, 0),
      EndContainer(),
    EndContainer(),
    NWidget(WWT_RESIZEBOX, COLOUR_BROWN),
  EndContainer(),
};
 
static WindowDesc _smallmap_desc(
  WDP_AUTO, "smallmap", 484, 314,
  WC_SMALLMAP, WC_NONE,
  0,
  _nested_smallmap_widgets
);
 
void ShowSmallMap()
{
  AllocateWindowDescFront<SmallMapWindow>(_smallmap_desc, 0);
}
 
bool ScrollMainWindowTo(int x, int y, int z, bool instant)
{
  bool res = ScrollWindowTo(x, y, z, GetMainWindow(), instant);
 
  /* If a user scrolls to a tile (via what way what so ever) and already is on
   * that tile (e.g.: pressed twice), move the smallmap to that location,
   * so you directly see where you are on the smallmap. */
 
  if (res) return res;
 
  SmallMapWindow *w = dynamic_cast<SmallMapWindow*>(FindWindowById(WC_SMALLMAP, 0));
  if (w != nullptr) w->SmallMapCenterOnCurrentPos();
 
  return res;
}
 
Point GetSmallMapStationMiddle(const Window *w, const Station *st)
{
  return static_cast<const SmallMapWindow *>(w)->GetStationMiddle(st);
}