From dd604a7b3650617ab3fef81eef1a63fc28761396 Mon Sep 17 00:00:00 2001
From: "Thiago Marcos P. Santos" <thiago@mapbox.com>
Date: Tue, 4 Oct 2016 15:51:00 +0300
Subject: [core] Pre-filter sources based on the layers they contain

---
 src/mbgl/style/style.cpp | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/mbgl/style/style.cpp b/src/mbgl/style/style.cpp
index 50de887dbc..522965b953 100644
--- a/src/mbgl/style/style.cpp
+++ b/src/mbgl/style/style.cpp
@@ -13,6 +13,7 @@
 #include <mbgl/style/layers/raster_layer.hpp>
 #include <mbgl/style/layer_impl.hpp>
 #include <mbgl/style/parser.hpp>
+#include <mbgl/style/query_parameters.hpp>
 #include <mbgl/style/transition_options.hpp>
 #include <mbgl/style/class_dictionary.hpp>
 #include <mbgl/style/update_parameters.hpp>
@@ -393,10 +394,23 @@ RenderData Style::getRenderData(MapDebugOptions debugOptions) const {
 }
 
 std::vector<Feature> Style::queryRenderedFeatures(const QueryParameters& parameters) const {
+    std::unordered_set<std::string> sourceFilter;
+
+    if (parameters.layerIDs) {
+        for (const auto& layerID : *parameters.layerIDs) {
+            auto layer = getLayer(layerID);
+            if (layer) sourceFilter.emplace(layer->baseImpl->source);
+        }
+    }
+
     std::vector<Feature> result;
     std::unordered_map<std::string, std::vector<Feature>> resultsByLayer;
 
     for (const auto& source : sources) {
+        if (!sourceFilter.empty() && sourceFilter.find(source->getID()) == sourceFilter.end()) {
+            continue;
+        }
+
         auto sourceResults = source->baseImpl->queryRenderedFeatures(parameters);
         std::move(sourceResults.begin(), sourceResults.end(), std::inserter(resultsByLayer, resultsByLayer.begin()));
     }
-- 
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