Fix crash when loading some resource packs. (#1838)

Author: leMaik

chunky/src/java/se/llbit/chunky/resources/texturepack/ConditionalTextures.java

@@ -5,8 +5,6 @@
 
 import java.io.IOException;
 import java.io.InputStream;
-import java.nio.file.Files;
-import java.nio.file.Path;
 
 /**
  * This texture loader will load different textures depending on a texture being available.
@@ -30,11 +28,6 @@ public boolean load(LayeredResourcePacks texturePack) {
     return otherwise.load(texturePack);
   }
 
-  @Override
-  public boolean loadFromTerrain(BitmapImage[] terrain) {
-    throw new UnsupportedOperationException("ConditionalTextures doesn't support loadFromTerrain");
-  }
-
   @Override
   protected boolean load(InputStream imageStream) throws IOException, TextureFormatError {
     throw new UnsupportedOperationException("Call load(ZipFile) instead!");

chunky/src/java/se/llbit/chunky/resources/texturepack/JsonFontTextureLoader.java

@@ -86,7 +86,8 @@ private boolean loadFontDefinitions(LayeredResourcePacks texturePack, String fon
       JsonObject definition = fontDefinition.asObject();
       if (definition.get("type").stringValue("").equals("bitmap")) {
         BitmapImage spritemap;
-        String texture = definition.get("file").stringValue("").split(":")[1];
+        String[] textureAndNamespace = definition.get("file").stringValue("").split(":");
+        String texture = textureAndNamespace.length > 1 ? textureAndNamespace[1] : textureAndNamespace[0];
         Optional<LayeredResourcePacks.Entry> texturePath = texturePack.getFirstEntry("assets/minecraft/textures/" + texture);
         if (texturePath.isPresent()) {
           try (InputStream imageStream = texturePath.get().getInputStream()) {
@@ -106,6 +107,10 @@ private boolean loadFontDefinitions(LayeredResourcePacks texturePack, String fon
 
         int width = spritemap.width / 16;
         int height = fontDefinition.asObject().get("height").asInt(8);
+        if (width <= 0 || height <= 0) {
+          // some resource packs somehow do this, ignore
+          continue;
+        }
         int ascent =
           fontDefinition
             .asObject()