New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/drape_frontend/gui/drape_gui.cpp

@@ -0,0 +1,75 @@
+#include "drape_gui.hpp"
+#include "ruler_helper.hpp"
+
+#include "drape_frontend/color_constants.hpp"
+#include "drape_frontend/visual_params.hpp"
+
+#include "base/assert.hpp"
+
+namespace gui
+{
+df::ColorConstant const kGuiTextColor = "GuiText";
+
+struct DrapeGui::Impl
+{
+  RulerHelper m_rulerHelper;
+};
+
+DrapeGui::DrapeGui()
+  : m_impl(new Impl())
+{}
+
+DrapeGui & DrapeGui::Instance()
+{
+  static DrapeGui s_gui;
+  if (!s_gui.m_impl)
+    s_gui.m_impl.reset(new Impl());
+
+  return s_gui;
+}
+
+RulerHelper & DrapeGui::GetRulerHelper()
+{
+  return Instance().GetRulerHelperImpl();
+}
+
+dp::FontDecl DrapeGui::GetGuiTextFont()
+{
+  return {df::GetColorConstant(kGuiTextColor), 14};
+}
+
+void DrapeGui::Destroy()
+{
+  ASSERT(m_impl != nullptr, ());
+  m_impl.reset();
+}
+
+void DrapeGui::SetSurfaceSize(m2::PointF const & size)
+{
+  std::lock_guard<std::mutex> lock(m_surfaceSizeMutex);
+  m_surfaceSize = size;
+}
+
+m2::PointF DrapeGui::GetSurfaceSize() const
+{
+  std::lock_guard<std::mutex> lock(m_surfaceSizeMutex);
+  return m_surfaceSize;
+}
+
+RulerHelper & DrapeGui::GetRulerHelperImpl()
+{
+  ASSERT(m_impl != nullptr, ());
+  return m_impl->m_rulerHelper;
+}
+
+void DrapeGui::ConnectOnCompassTappedHandler(Shape::TTapHandler const & handler)
+{
+  m_onCompassTappedHandler = handler;
+}
+
+void DrapeGui::CallOnCompassTappedHandler()
+{
+  if(m_onCompassTappedHandler != nullptr)
+    m_onCompassTappedHandler();
+}
+}  // namespace gui