add asset propagation for grass textures

docs/release-notes.md

@@ -7,6 +7,9 @@
   * Updated for the 'Force Off' gamepad mode added in Stardew Valley 1.4.0.1.
   * Fixed compatibility issue with Arch Linux.
 
+* For modders:
+  * Added asset propagation for grass textures.
+
 * For the web UI:
   * If a JSON validator upload can't be saved to Pastebin (e.g. due to rate limits), it's now uploaded to Amazon S3 instead. Files uploaded to S3 expire after one month.
   * Updated the JSON validator for Content Patcher 1.10.0.

src/SMAPI/Metadata/CoreAssetPropagator.cs

@@ -474,10 +474,14 @@ namespace StardewModdingAPI.Metadata
                 /****
                 ** Content\TerrainFeatures
                 ****/
-                case "terrainfeatures\\flooring": // Flooring
+                case "terrainfeatures\\flooring": // from Flooring
                     Flooring.floorsTexture = content.Load<Texture2D>(key);
                     return true;
 
+                case "terrainfeatures\\grass": // from Grass
+                    this.ReloadGrassTextures(content, key);
+                    return true;
+
                 case "terrainfeatures\\hoedirt": // from HoeDirt
                     HoeDirt.lightTexture = content.Load<Texture2D>(key);
                     return true;
@@ -694,6 +698,35 @@ namespace StardewModdingAPI.Metadata
             return true;
         }
 
+        /// <summary>Reload tree textures.</summary>
+        /// <param name="content">The content manager through which to reload the asset.</param>
+        /// <param name="key">The asset key to reload.</param>
+        /// <returns>Returns whether any textures were reloaded.</returns>
+        private bool ReloadGrassTextures(LocalizedContentManager content, string key)
+        {
+            Grass[] grasses =
+                (
+                    from location in Game1.locations
+                    from grass in location.terrainFeatures.Values.OfType<Grass>()
+                    let textureName = this.NormalizeAssetNameIgnoringEmpty(
+                        this.Reflection.GetMethod(grass, "textureName").Invoke<string>()
+                    )
+                    where textureName == key
+                    select grass
+                )
+                .ToArray();
+
+            if (grasses.Any())
+            {
+                Lazy<Texture2D> texture = new Lazy<Texture2D>(() => content.Load<Texture2D>(key));
+                foreach (Grass grass in grasses)
+                    this.Reflection.GetField<Lazy<Texture2D>>(grass, "texture").SetValue(texture);
+                return true;
+            }
+
+            return false;
+        }
+
         /// <summary>Reload the disposition data for matching NPCs.</summary>
         /// <param name="content">The content manager through which to reload the asset.</param>
         /// <param name="key">The asset key to reload.</param>