diff --git a/server/TracyTimelineController.cpp b/server/TracyTimelineController.cpp
index a8ca0189..3546246e 100644
--- a/server/TracyTimelineController.cpp
+++ b/server/TracyTimelineController.cpp
@@ -1,7 +1,6 @@
 #include <algorithm>
 
-#include "imgui.h"
-
+#include "TracyImGui.hpp"
 #include "TracyTimelineController.hpp"
 
 namespace tracy
@@ -107,11 +106,19 @@ void TimelineController::End( double pxns, const ImVec2& wpos, bool hover,  bool
         UpdateCenterItem();
     }
 
+    TimelineContext ctx;
+    ctx.w = ImGui::GetContentRegionAvail().x - 1;
+    ctx.ty = ImGui::GetTextLineHeight();
+    ctx.scale = GetScale();
+    ctx.pxns = pxns;
+    ctx.nspx = 1.0 / pxns;
+    ctx.wpos = wpos;
+
     for( auto& item : m_items )
     {
         if( item->WantPreprocess() && item->IsVisible() )
         {
-            item->Preprocess();
+            item->Preprocess( ctx );
         }
     }
 
diff --git a/server/TracyTimelineItem.hpp b/server/TracyTimelineItem.hpp
index f5f53beb..310525c1 100644
--- a/server/TracyTimelineItem.hpp
+++ b/server/TracyTimelineItem.hpp
@@ -12,6 +12,13 @@ namespace tracy
 class View;
 class Worker;
 
+struct TimelineContext
+{
+    float w, ty, scale;
+    double pxns, nspx;
+    ImVec2 wpos;
+};
+
 class TimelineItem
 {
 public:
@@ -22,7 +29,7 @@ public:
     void Draw( bool firstFrame, double pxns, int yOffset, const ImVec2& wpos, bool hover, float yMin, float yMax );
 
     bool WantPreprocess() const { return m_wantPreprocess; }
-    virtual void Preprocess() { assert( false ); }
+    virtual void Preprocess( const TimelineContext& ctx ) { assert( false ); }
 
     void VisibilityCheckbox();
     virtual void SetVisible( bool visible ) { m_visible = visible; }