Exposed GetOverlayDrawList(). (~#545, ~#530)

imgui.cpp

@@ -2233,6 +2233,11 @@ int ImGui::GetFrameCount()
     return GImGui->FrameCount;
 }
 
+ImDrawList* ImGui::GetOverlayDrawList()
+{
+    return &GImGui->OverlayDrawList;
+}
+
 void ImGui::NewFrame()
 {
     ImGuiContext& g = *GImGui;

imgui.h

@@ -441,6 +441,7 @@ namespace ImGui
     IMGUI_API bool          IsRectVisible(const ImVec2& rect_min, const ImVec2& rect_max);      // test if rectangle (in screen space) is visible / not clipped. to perform coarse clipping on user's side.
     IMGUI_API float         GetTime();
     IMGUI_API int           GetFrameCount();
+    IMGUI_API ImDrawList*   GetOverlayDrawList();                                               // this draw list will be the last rendered one, useful to quickly draw overlays shapes/text
     IMGUI_API const char*   GetStyleColorName(ImGuiCol idx);
     IMGUI_API ImVec2        CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = +0.0f);   // utility to find the closest point the last item bounding rectangle edge. useful to visually link items
     IMGUI_API ImVec2        CalcTextSize(const char* text, const char* text_end = NULL, bool hide_text_after_double_hash = false, float wrap_width = -1.0f);