Add a mouseover_image image key in game_config...

...to render an overlay under the mouse Working but not used yet.

data/game_config.cfg

@@ -98,6 +98,7 @@
     terrain_mask_image="terrain/alphamask.png"
     grid_image_top="terrain/grid-top.png"
     grid_image_bottom="terrain/grid-bottom.png"
+    mouseover_image=""
     unreachable_image="terrain/darken.png"
 
     fog_prefix="terrain/fog"

src/game_config.cpp

@@ -61,6 +61,7 @@ namespace game_config
 	std::string terrain_mask_image = "terrain/alphamask.png";
 	std::string grid_image_top = "terrain/grid-top.png";
 	std::string grid_image_bottom = "terrain/grid-bottom.png";
+	std::string mouseover_image = "";
 	std::string unreachable_image = "terrain/darken.png";    /**< overlay image for unreachable tiles. */
 	std::string linger_image = "terrain/darken-linger.png";  /**< overlay image for tiles in linger mode. */
 
@@ -204,6 +205,7 @@ namespace game_config
 		terrain_mask_image = v["terrain_mask_image"].str();
 		grid_image_top = v["grid_image_top"].str();
 		grid_image_bottom = v["grid_image_bottom"].str();
+		mouseover_image = v["mouseover_image"].str();
 		unreachable_image = v["unreachable_image"].str();
 
 		shroud_prefix = v["shroud_prefix"].str();

src/game_config.hpp

@@ -70,6 +70,7 @@ namespace game_config
 		flag_image, flag_icon_image,
 		terrain_mask_image,
 		grid_image_top, grid_image_bottom,
+		mouseover_image,
 		unreachable_image, linger_image,
 		shroud_prefix, fog_prefix,
 		observer_image, tod_bright_image, tod_dark_image,

src/game_display.cpp

@@ -387,6 +387,11 @@ void game_display::draw_hex(const map_location& loc)
 		blit.surf.clear();
 	}
 
+	if(on_map && loc == mouseoverHex_ && !game_config::mouseover_image.empty()) {
+		drawing_buffer_add(LAYER_MOVE_INFO, loc, tblit(xpos, ypos,
+			image::get_image(game_config::mouseover_image, image::UNMASKED)));
+	}
+
 	// Show def% and turn to reach infos
 	if(!is_shrouded && on_map) {
 		draw_movement_info(loc);