I now have hacked in basic color for the wall tiles but not enemies and items.

assets/tiles.json

@@ -5,6 +5,8 @@
     "display": 10398,
     "ceiling": "ceiling_black",
     "light": 0,
+    "foreground": [40, 40, 40],
+    "background": [10, 10, 10],
     "id": 0
   },
   "wall_plain": {
@@ -12,6 +14,8 @@
     "collision": true,
     "display": 9608,
     "light": 0,
+    "foreground": [100, 100, 100],
+    "background": [10, 10, 10],
     "id": 1
   },
   "wall_moss": {
@@ -19,6 +23,8 @@
     "collision": true,
     "display": 8820,
     "light": 20,
+    "foreground": [150, 255, 150],
+    "background": [10, 10, 10],
     "id": 2
   },
   "ceiling_black": {
@@ -26,6 +32,8 @@
     "collision": false,
     "display": 35,
     "light": 0,
+    "foreground": [150, 150, 150],
+    "background": [10, 10, 10],
     "id": 4
   },
   "lava_floor": {
@@ -34,6 +42,8 @@
     "display": 35,
     "ceiling": "ceiling_black",
     "light": 20,
+    "foreground": [255, 0, 0],
+    "background": [10, 10, 10],
     "id": 5
   },
   "gray_stone_floor_light": {
@@ -42,6 +52,8 @@
     "display": 35,
     "ceiling": "ceiling_blue_light",
     "light": 40,
+    "foreground": [150, 150, 150],
+    "background": [10, 10, 10],
     "id": 6
   },
   "ceiling_blue_light": {
@@ -49,6 +61,8 @@
     "collision": false,
     "display": 35,
     "light": 0,
+    "foreground": [150, 150, 150],
+    "background": [10, 10, 10],
     "id": 7
   },
   "wood_wall": {
@@ -56,6 +70,8 @@
     "collision": false,
     "display": 35,
     "light": 0,
+    "foreground": [250, 250, 150],
+    "background": [10, 10, 10],
     "id": 8
   }
 }

tests/map.cpp

@@ -121,7 +121,7 @@ TEST_CASE("map image test", "[map-sprite]") {
     auto coords = sprite_coord.at(display);
     sf::IntRect square{coords, {size.x, size.y}};
     sf::Sprite sprite{map_sprites, square};
-    sprite.setColor({150,150,150,255});
+    // sprite.setColor({150,150,150,255});
     sprite.setPosition({float(it.x * size.x), float(it.y * size.y)});
     render.draw(sprite);
   }

tools/icongen.cpp

@@ -25,6 +25,7 @@ using BoolGrid = Base<bool>;
 struct MapConfig {
   MapGrid map = make<wchar_t>(TILE_COUNT, TILE_COUNT);
   BoolGrid centered = make<bool>(TILE_COUNT, TILE_COUNT);
+  std::unordered_map<wchar_t, sf::Color> colors;
   each_row_t<MapGrid> it{map};
 };
 
@@ -124,7 +125,7 @@ struct MapTileBuilder {
         sprite.setPosition(cell_pos);
       }
 
-      sprite.setColor(DEFAULT_COLOR);
+      sprite.setColor(config.colors[display_char]);
 
       $render->draw(sprite);
     }
@@ -160,8 +161,18 @@ void load_config(MapConfig& config, bool is_centered, std::string path, std::fun
 
   for(auto [key, val] : tiles.json().items()) {
     config.it.next();
-    config.map[config.it.y][config.it.x] = finder(val);
+    auto display = finder(val);
+    config.map[config.it.y][config.it.x] = display;
     config.centered[config.it.y][config.it.x] = is_centered;
+
+    if(val.contains("foreground")) {
+      auto fg_color = val["foreground"];
+      sf::Color fg{fg_color[0], fg_color[1], fg_color[2]};
+      config.colors.insert_or_assign(display, fg);
+    } else {
+      sf::Color fg{255, 100, 100};
+      config.colors.insert_or_assign(display, fg);
+    }
   }
 }