App 2.40.2: the Grid map moves on the GPU

The map was hardware-rendered, but every frame recomputed every road
point, rebuilt every path and drew the big roads three times, at 20
frames a second, and the car jumped with each GPS fix. Now it is its own
view under the Grid (MapLayerView, a hardware layer): drawn once into a
GPU texture and only redrawn when tiles change or after about 230 m;
each display frame only sets its translation and rotation. The car
glides between fixes, and the Grid over the map redraws only with the
readings.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LhzAVaUyqcw5PkGjz4mWW6

app/src/main/java/com/evsuite/abrp/MapRoads.java

@@ -65,6 +65,8 @@ final class MapRoads {
         return t;
     });
     private volatile Fix fix;
+    /** Goes up whenever a tile arrives or is dropped, so a view knows to rebuild its shapes. */
+    private volatile int version;
     /** The last bearing while moving; GPS has none at a standstill. */
     private volatile float bearing = Float.NaN;
     private volatile boolean serverMissing;
@@ -100,6 +102,10 @@ final class MapRoads {
         return f == null || SystemClock.elapsedRealtime() - f.elapsedMs > FIX_FRESH_MS ? null : f;
     }
 
+    int version() {
+        return version;
+    }
+
     Collection<RoadTile> tiles() {
         return tiles.values();
     }
@@ -116,7 +122,10 @@ final class MapRoads {
     /** Queues the 3×3 tiles round (cx, cy), the car's own first, and forgets far ones. */
     private void want(int cx, int cy) {
         for (Long key : tiles.keySet()) {
-            if (Math.abs(MapGeometry.keyX(key) - cx) > 2 || Math.abs(MapGeometry.keyY(key) - cy) > 2) tiles.remove(key);
+            if (Math.abs(MapGeometry.keyX(key) - cx) > 2 || Math.abs(MapGeometry.keyY(key) - cy) > 2) {
+                tiles.remove(key);
+                version++;
+            }
         }
         int[][] order = { {0, 0}, {0, -1}, {1, 0}, {0, 1}, {-1, 0}, {1, -1}, {1, 1}, {-1, 1}, {-1, -1} };
         long now = SystemClock.elapsedRealtime();
@@ -152,6 +161,7 @@ final class MapRoads {
         }
         if (cached != null) {
             tiles.put(key, cached);
+            version++;
             if (System.currentTimeMillis() - file.lastModified() < DISK_AGE_MS) return;
         }
         ServerConfig config = ServerConfig.get(context);
@@ -172,6 +182,7 @@ final class MapRoads {
             }
             failedAt.remove(key);
             tiles.put(key, tile);
+            version++;
             save(file, r.body);
         } catch (Exception e) {
             Log.w(TAG, "Map tile not loaded: " + e.getClass().getSimpleName());