Add stronghold loot support for seed map

Author: xpple

src/main/c/cubiomes

@@ -19,7 +19,7 @@ public enum MapFeature {
     DESERT_PYRAMID("desert_pyramid", Cubiomes.Desert_Pyramid(), Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_1_3(), "cubiomes_viewer_icons", 19, 20),
     JUNGLE_PYRAMID("jungle_pyramid", Cubiomes.Jungle_Pyramid(), Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_1_3(), "cubiomes_viewer_icons", 19, 20),
     SWAMP_HUT("swamp_hut", Cubiomes.Swamp_Hut(), Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_1_4(), "cubiomes_viewer_icons", 20, 20),
-    STRONGHOLD("stronghold", -1, Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_B1_8(), "cubiomes_viewer_icons", 19, 20),
+    STRONGHOLD("stronghold", Cubiomes.Stronghold(), Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_B1_8(), "cubiomes_viewer_icons", 19, 20),
     IGLOO("igloo", Cubiomes.Igloo(), Cubiomes.DIM_OVERWORLD(), Cubiomes.MC_1_9(), "cubiomes_viewer_icons", 20, 20) {
         private static final Texture IGLOO_BASEMENT_TEXTURE = new Texture("igloo_basement", "cubiomes_viewer_icons", 20, 20);
         @Override

src/main/java/dev/xpple/seedmapper/seedmap/MapFeature.java

@@ -972,8 +972,9 @@ private void showLoot(FeatureWidget widget) {
         // temporary arena so that everything will be deallocated after the loot is calculated
         try (Arena tempArena = Arena.ofConfined()) {
             MemorySegment structureVariant = StructureVariant.allocate(tempArena);
-            Cubiomes.getVariant(structureVariant, structure, this.version, this.seed, pos.getX(), pos.getZ(), biome);
-            biome = StructureVariant.biome(structureVariant) != -1 ? StructureVariant.biome(structureVariant) : biome;
+            if (Cubiomes.getVariant(structureVariant, structure, this.version, this.seed, pos.getX(), pos.getZ(), biome) != 0) {
+                biome = StructureVariant.biome(structureVariant) != -1 ? StructureVariant.biome(structureVariant) : biome;
+            }
             MemorySegment structureSaltConfig = StructureSaltConfig.allocate(tempArena);
             if (Cubiomes.getStructureSaltConfig(structure, this.version, biome, structureSaltConfig) == 0) {
                 return;