From f018229fd5bebb57d8bfc596d832652d6593da03 Mon Sep 17 00:00:00 2001
From: Mikhail Pozdnyakov <mikhail.pozdnyakov@mapbox.com>
Date: Fri, 12 Apr 2019 14:56:09 +0300
Subject: Use emplace_hint for inserting render items

---
 src/mbgl/renderer/renderer_impl.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/mbgl/renderer/renderer_impl.cpp b/src/mbgl/renderer/renderer_impl.cpp
index c634e900a8..5078e01edb 100644
--- a/src/mbgl/renderer/renderer_impl.cpp
+++ b/src/mbgl/renderer/renderer_impl.cpp
@@ -236,10 +236,10 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
 
     std::set<RenderItem> renderItems;
     std::vector<const RenderLayerSymbolInterface*> renderItemsWithSymbols;
+    auto renderItemsEmplaceHint = renderItems.begin();
 
     // Update all sources and initialize renderItems.
     staticData->has3D = false;
-    
     for (const auto& sourceImpl : *sourceImpls) {
         RenderSource* source = renderSources.at(sourceImpl->id).get();
         std::vector<Immutable<Layer::Impl>> filteredLayersForSource;
@@ -263,7 +263,7 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
                     if (layerNeedsRendering) {
                         sourceNeedsRendering = true;
                         filteredLayersForSource.push_back(layerImpl);
-                        renderItems.emplace(*layer, source, index);
+                        renderItemsEmplaceHint = renderItems.emplace_hint(renderItemsEmplaceHint, *layer, source, index);
                     }
                 }
                 continue;
@@ -278,7 +278,7 @@ void Renderer::Impl::render(const UpdateParameters& updateParameters) {
                         continue; // This layer is shown with background color, and it shall not be added to render items. 
                     }
                 }
-                renderItems.emplace(*layer, nullptr, index);
+                renderItemsEmplaceHint = renderItems.emplace_hint(renderItemsEmplaceHint, *layer, nullptr, index);
             }
         }
         source->update(sourceImpl,
-- 
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