From 8650c6cd814d6ac04d754689fd15b23701fc7776 Mon Sep 17 00:00:00 2001
From: rachytski <siarhei.rachytski@gmail.com>
Date: Thu, 24 Jan 2013 18:51:39 +0300
Subject: [PATCH] refactored gui::Button to use graphics::DisplayList's for
 faster rendering.

---
 gui/button.cpp | 62 +++++++++++++++++++++++++++++++++++++++++++++-----
 gui/button.hpp |  7 ++++++
 2 files changed, 63 insertions(+), 6 deletions(-)

diff --git a/gui/button.cpp b/gui/button.cpp
index 82e6cbb41a..a415bc83cc 100644
--- a/gui/button.cpp
+++ b/gui/button.cpp
@@ -1,5 +1,9 @@
 #include "button.hpp"
-#include "../graphics/overlay_renderer.hpp"
+#include "controller.hpp"
+
+#include "../graphics/screen.hpp"
+
+#include "../geometry/transformations.hpp"
 
 namespace gui
 {
@@ -97,6 +101,45 @@ namespace gui
     Element::setController(controller);
   }
 
+  void Button::cacheButtonBody(EState state)
+  {
+    graphics::Screen * cs = m_controller->GetCacheScreen();
+
+    cs->beginFrame();
+
+    shared_ptr<graphics::DisplayList> & dl = m_dls[state];
+
+    dl.reset();
+    dl.reset(cs->createDisplayList());
+
+    cs->setDisplayList(dl.get());
+
+    double k = visualScale();
+    m2::RectD rr = roughBoundRect();
+
+    cs->drawRoundedRectangle(m2::RectD(-rr.SizeX() / 2,
+                                       -rr.SizeY() / 2,
+                                        rr.SizeX() / 2,
+                                        rr.SizeY() / 2),
+                             10 * k, color(state), depth());
+
+    cs->setDisplayList(0);
+
+    cs->endFrame();
+  }
+
+  void Button::cache()
+  {
+    cacheButtonBody(EActive);
+    cacheButtonBody(EPressed);
+  }
+
+  void Button::purge()
+  {
+    m_dls.clear();
+    m_textView->purge();
+  }
+
   vector<m2::AnyRectD> const & Button::boundRects() const
   {
     if (isDirtyRect())
@@ -137,17 +180,23 @@ namespace gui
     if (!isVisible())
       return;
 
-    double k = visualScale();
+    checkDirtyLayout();
 
-    r->drawRoundedRectangle(roughBoundRect(), 10 * k, color(state()), depth());
+    math::Matrix<double, 3, 3> drawM = math::Shift(math::Identity<double, 3>(),
+                                                   pivot());
 
-    graphics::FontDesc desc = font(state());
-    desc.m_size *= k;
+    map<EState, shared_ptr<graphics::DisplayList> >::const_iterator it;
+    it = m_dls.find(state());
+
+    if (it != m_dls.end())
+      r->drawDisplayList(it->second.get(), drawM * m);
+    else
+      LOG(LWARNING, ("m_dls[state] is not set!"));
 
     m_textView->draw(r, m);
   }
 
-  void Button::setPivot(m2::PointD const &pv)
+  void Button::setPivot(m2::PointD const & pv)
   {
     m_textView->setPivot(pv);
     Element::setPivot(pv);
@@ -165,3 +214,4 @@ namespace gui
     Element::setColor(state, c);
   }
 }
+
diff --git a/gui/button.hpp b/gui/button.hpp
index 049cf16df1..0be6bc233c 100644
--- a/gui/button.hpp
+++ b/gui/button.hpp
@@ -33,9 +33,14 @@ namespace gui
     unsigned m_minHeight;
 
     scoped_ptr<TextView> m_textView;
+    map<EState, shared_ptr<graphics::DisplayList> > m_dls;
+
+    void cacheButtonBody(EState state);
 
     mutable vector<m2::AnyRectD> m_boundRects;
 
+    void cache();
+
   public:
 
     struct Params : Element::Params
@@ -75,6 +80,8 @@ namespace gui
     vector<m2::AnyRectD> const & boundRects() const;
     void draw(graphics::OverlayRenderer * r, math::Matrix<double, 3, 3> const & m) const;
 
+    void purge();
+
     /// @}
   };
 }