Add rendering of leisure=dog_park

Dog parks are rendered in a slightly darker shade of the fill colour
used for parks.

The 'paw' icon is based on work contributed to the public domain by Trac
user Giardia¹.

This closes gravitystorm#341.

1: https://trac.openstreetmap.org/ticket/2482

amenity-points.mss

@@ -915,6 +915,13 @@
     marker-clip: false;
   }
 
+  [feature = 'leisure_dog_park'][zoom >= 17] {
+    marker-file: url('symbols/dog_park.16.svg');
+    marker-placement: interior;
+    marker-fill: darken(@park, 60%);
+    marker-clip: false;
+  }
+
   [feature = 'leisure_playground'][zoom >= 17] {
     marker-file: url('symbols/playground.16.svg');
     marker-fill: @amenity-brown;
@@ -1208,6 +1215,17 @@
     text-placement: interior;
   }
 
+  [feature = 'leisure_dog_park'][zoom >= 17] {
+    text-name: "[name]";
+    text-size: @standard-text-size;
+    text-fill: darken(@park, 60%);
+    text-face-name: @standard-font;
+    text-halo-radius: 1.5; /* Extra halo needed to stand out from paw pattern. */
+    text-halo-fill: rgba(255,255,255,0.6);
+    text-wrap-width: @standard-wrap-width;
+    text-placement: interior;
+  }
+
   [feature = 'amenity_parking'][zoom >= 10][way_pixels > 900],
   [feature = 'amenity_bicycle_parking'][zoom >= 10][way_pixels > 900],
   [feature = 'amenity_motorcycle_parking'][zoom >= 10][way_pixels > 900] {

landcover.mss

@@ -219,6 +219,20 @@
     }
   }
 
+  [feature = 'leisure_dog_park'] {
+    [zoom >= 10] {
+      polygon-fill: darken(@park, 5%);
+      [way_pixels >= 4]  { polygon-gamma: 0.75; }
+      [way_pixels >= 64] { polygon-gamma: 0.3;  }
+    }
+    [zoom >= 16] {
+      polygon-pattern-file: url('symbols/dog_park.png');
+      polygon-pattern-alignment: global;
+      [way_pixels >= 4]  { polygon-pattern-gamma: 0.75; }
+      [way_pixels >= 64] { polygon-pattern-gamma: 0.3;  }
+    }
+  }
+
   [feature = 'leisure_golf_course'][zoom >= 10],
   [feature = 'leisure_miniature_golf'][zoom >= 15] {
     polygon-fill: @golf_course;

project.yaml

@@ -152,7 +152,7 @@ Layer:
                                                     'brownfield', 'landfill', 'construction') THEN landuse ELSE NULL END)) AS landuse,
               ('leisure_' || (CASE WHEN leisure IN ('swimming_pool', 'playground', 'park', 'recreation_ground', 'common', 'garden', 
                                                     'golf_course', 'miniature_golf', 'picnic_table', 'sports_centre', 'stadium', 'pitch', 
-                                                    'track') THEN leisure ELSE NULL END)) AS leisure,
+                                                    'track', 'dog_park') THEN leisure ELSE NULL END)) AS leisure,
               ('military_' || (CASE WHEN military IN ('danger_area') THEN military ELSE NULL END)) AS military,
               ('natural_' || (CASE WHEN "natural" IN ('beach', 'shoal', 'heath', 'grassland', 'wood', 'sand', 'scree', 'shingle', 'bare_rock', 'scrub') THEN "natural" ELSE NULL END)) AS "natural",
               ('wetland_' || (CASE WHEN "natural" IN ('wetland', 'marsh', 'mud') THEN (CASE WHEN "natural" IN ('marsh', 'mud') THEN "natural" ELSE wetland END) ELSE NULL END)) AS wetland,
@@ -1755,7 +1755,8 @@ Layer:
                                             'real_estate', 'religion', 'rental', 'salon', 'scuba_diving', 'second_hand', 'sewing', 'shoe_repair', 'shopping_centre', 
                                             'solarium', 'souvenir', 'tailor', 'tanning', 'tattoo', 'tea', 'ticket', 'tiles', 'tobacco', 'trade', 'tyres', 
                                             'vacuum_cleaner', 'video', 'video_games', 'watches', 'wholesale', 'yes') THEN 'other' ELSE NULL END,
-              'leisure_' || CASE WHEN leisure IN ('water_park', 'playground', 'miniature_golf', 'golf_course', 'picnic_table', 'slipway') THEN leisure ELSE NULL END,
+              'leisure_' || CASE WHEN leisure IN ('water_park', 'playground', 'miniature_golf', 'golf_course', 'picnic_table', 'slipway',
+                                                  'dog_park') THEN leisure ELSE NULL END,
               'man_made_' || CASE WHEN man_made IN ('mast', 'water_tower', 'lighthouse', 'windmill', 'obelisk') THEN man_made ELSE NULL END,
               'natural_' || CASE WHEN "natural" IN ('peak', 'volcano', 'saddle', 'spring', 'cave_entrance') THEN "natural" ELSE NULL END,
               'historic_' || CASE WHEN historic IN ('memorial', 'monument', 'archaeological_site') THEN historic ELSE NULL END,
@@ -1793,7 +1794,8 @@ Layer:
                            'taxi', 'theatre', 'toilets', 'drinking_water', 'prison', 'hunting_stand', 'nightclub', 
                            'veterinary', 'social_facility')
             OR shop IS NOT NULL -- skip checking a huge list and use a null check
-            OR leisure IN ('water_park', 'playground', 'miniature_golf', 'golf_course', 'picnic_table', 'slipway')
+            OR leisure IN ('water_park', 'playground', 'miniature_golf', 'golf_course', 'picnic_table', 'slipway',
+                           'dog_park')
             OR man_made IN ('mast', 'water_tower', 'lighthouse', 'windmill', 'cross', 'obelisk')
             OR "natural" IN ('peak', 'volcano', 'saddle', 'spring', 'cave_entrance')
             OR historic IN ('memorial', 'monument', 'archaeological_site', 'wayside_cross')
@@ -2075,7 +2077,7 @@ Layer:
                                             'yes') THEN 'other' ELSE NULL END,
               'leisure_' || CASE WHEN leisure IN ('swimming_pool', 'water_park', 'miniature_golf', 'golf_course', 'sports_centre', 'stadium', 'track', 
                                                   'pitch', 'playground', 'park', 'recreation_ground', 'common', 'garden', 'nature_reserve', 'marina', 
-                                                  'picnic_table') THEN leisure ELSE NULL END,
+                                                  'picnic_table', 'dog_park') THEN leisure ELSE NULL END,
               'power_' || CASE WHEN power IN ('plant', 'station', 'generator', 'sub_station', 'substation') THEN power ELSE NULL END,
               'landuse_' || CASE WHEN landuse IN ('reservoir', 'basin', 'recreation_ground', 'village_green', 'quarry', 'vineyard', 'orchard', 'cemetery', 
                                                   'residential', 'garages', 'meadow', 'grass', 'allotments', 'forest', 'farmyard', 'farm', 'farmland', 
@@ -2217,7 +2219,7 @@ Layer:
                                                 'wholesale', 'yes') THEN 'other' ELSE NULL END,
                   'leisure_' || CASE WHEN leisure IN ('swimming_pool', 'water_park', 'miniature_golf', 'golf_course', 'sports_centre', 'stadium', 'track',  
                                                       'pitch','playground', 'park', 'recreation_ground', 'common', 'garden', 'nature_reserve', 'marina',  
-                                                      'slipway', 'picnic_table') THEN leisure ELSE NULL END,
+                                                      'slipway', 'picnic_table', 'dog_park') THEN leisure ELSE NULL END,
                   'power_' || CASE WHEN power IN ('plant', 'station', 'generator', 'sub_station', 'substation') THEN power ELSE NULL END,
                   'landuse_' || CASE WHEN landuse IN ('reservoir', 'basin', 'recreation_ground', 'village_green', 'quarry', 'vineyard', 'orchard', 'cemetery', 
                                                       'residential', 'garages', 'meadow', 'grass', 'allotments', 'forest', 'farmyard', 'farm', 'farmland',