From 9322e2e74fce2a3702f9605204192c7edc377fc2 Mon Sep 17 00:00:00 2001
From: rachytski <siarhei.rachytski@gmail.com>
Date: Sun, 8 Jan 2012 15:25:27 +0400
Subject: [PATCH] added clipping elements in InfoLayer to the specified
 rectangle bounds.

---
 map/tile_renderer.cpp |  4 ++++
 yg/info_layer.cpp     | 44 +++++++++++++++++++++++++++++++++++++++++++
 yg/info_layer.hpp     |  2 ++
 3 files changed, 50 insertions(+)

diff --git a/map/tile_renderer.cpp b/map/tile_renderer.cpp
index f8eb19791b..258e00cf93 100644
--- a/map/tile_renderer.cpp
+++ b/map/tile_renderer.cpp
@@ -177,6 +177,10 @@ void TileRenderer::DrawTile(core::CommandsQueue::Environment const & env,
   if (!env.isCancelled())
     drawer->screen()->resetInfoLayer();
 
+  /// filter out the overlay elements that are out of the bound rect for the tile
+  if (!env.isCancelled())
+    tileInfoLayer->clip(renderRect);
+
   yg::gl::PacketsQueue * glQueue = threadData.m_drawerParams.m_renderQueue;
 
   if (!env.isCancelled())
diff --git a/yg/info_layer.cpp b/yg/info_layer.cpp
index dbef6fb941..fb02064245 100644
--- a/yg/info_layer.cpp
+++ b/yg/info_layer.cpp
@@ -255,5 +255,49 @@ namespace yg
         v[pos]->setIsNeedRedraw(false);
     }
   }
+
+  void InfoLayer::clip(m2::RectI const & r)
+  {
+    vector<shared_ptr<OverlayElement> > v;
+    m_tree.ForEach(MakeBackInsertFunctor(v));
+    m_tree.Clear();
+
+    int clippedCnt = 0;
+    int elemCnt = v.size();
+
+    m2::RectD rd(r);
+    m2::AnyRectD ard(rd);
+
+    for (unsigned i = 0; i < v.size(); ++i)
+    {
+      shared_ptr<OverlayElement> const & e = v[i];
+
+      if (!e->isVisible())
+      {
+        clippedCnt++;
+        continue;
+      }
+
+      if (!e->roughBoundRect().IsIntersect(rd))
+        clippedCnt++;
+      else
+      {
+        bool hasIntersection = false;
+        for (unsigned j = 0; j < e->boundRects().size(); ++j)
+        {
+          if (ard.IsIntersect(e->boundRects()[j]))
+          {
+            hasIntersection = true;
+            break;
+          }
+        }
+
+        if (hasIntersection)
+          processOverlayElement(e);
+      }
+    }
+
+    LOG(LINFO, ("clipped out", clippedCnt, "elements,", elemCnt, "elements total"));
+  }
 }
 
diff --git a/yg/info_layer.hpp b/yg/info_layer.hpp
index e317f81244..ad93643d3f 100644
--- a/yg/info_layer.hpp
+++ b/yg/info_layer.hpp
@@ -51,5 +51,7 @@ namespace yg
     void setCouldOverlap(bool flag);
 
     void merge(InfoLayer const & infoLayer, math::Matrix<double, 3, 3> const & m);
+
+    void clip(m2::RectI const & r);
   };
 }