[core] Convert "legacy" filters directly into expressions (#11610)

Ports the specialized filter-* expressions from GL JS, adding them to src/mbgl/style/expression/compound_expression.cpp

1 files changed, 5 insertions, 7 deletions

diff --git a/platform/android/src/style/layers/layer.cpp b/platform/android/src/style/layers/layer.cpp
index 6fe6e3cb29..c7a6bcd3a3 100644
--- a/platform/android/src/style/layers/layer.cpp
+++ b/platform/android/src/style/layers/layer.cpp
@@ -157,14 +157,12 @@ namespace android {
         using namespace mbgl::style::conversion;
 
         Filter filter = layer.accept(GetFilterEvaluator());
-
-        jni::Object<gson::JsonElement> converted;
-        if (filter.is<ExpressionFilter>()) {
-            ExpressionFilter filterExpression = filter.get<ExpressionFilter>();
-            mbgl::Value expressionValue = filterExpression.expression.get()->serialize();
-            converted = gson::JsonElement::New(env, expressionValue);
+        if (filter.expression) {
+            mbgl::Value expressionValue = (*filter.expression)->serialize();
+            return gson::JsonElement::New(env, expressionValue);
+        } else {
+            return jni::Object<gson::JsonElement>();
         }
-        return converted;
     }
 
     struct SetSourceLayerEvaluator {