Pass Cairo context down to child elements instead of recreating it.

rtgui/filebrowserentry.cc

@@ -705,14 +705,13 @@ void FileBrowserEntry::updateCursor (int x, int y)
     }
 }
 
-void FileBrowserEntry::draw ()
+void FileBrowserEntry::draw (Cairo::RefPtr<Cairo::Context> cc)
 {
 
-    ThumbBrowserEntryBase::draw ();
+    ThumbBrowserEntryBase::draw (cc);
 
     if (state == SRotateSelecting) {
-        Cairo::RefPtr<Cairo::Context> cr = parent->getDrawingArea ()->get_window()->create_cairo_context();
-        drawStraightenGuide (cr);
+        drawStraightenGuide (cc);
     }
 }
 

rtgui/filebrowserentry.h

@@ -70,7 +70,7 @@ public:
 
     FileBrowserEntry (Thumbnail* thm, const Glib::ustring& fname);
     ~FileBrowserEntry ();
-    void draw ();
+    void draw (Cairo::RefPtr<Cairo::Context> cc);
 
     void setImageAreaToolListener (ImageAreaToolListener* l)
     {

rtgui/thumbbrowserbase.cc

@@ -917,7 +917,7 @@ bool ThumbBrowserBase::Internal::on_draw(const ::Cairo::RefPtr< Cairo::Context>
                 parent->fd[i]->updatepriority = false;
             } else {
                 parent->fd[i]->updatepriority = true;
-                parent->fd[i]->draw ();
+                parent->fd[i]->draw (cr);
             }
         }
     }

rtgui/thumbbrowserentrybase.cc

@@ -467,7 +467,7 @@ void ThumbBrowserEntryBase::drawFrame (Cairo::RefPtr<Cairo::Context> cc, const G
     }
 }
 
-void ThumbBrowserEntryBase::draw ()
+void ThumbBrowserEntryBase::draw (Cairo::RefPtr<Cairo::Context> cc)
 {
 
     if (!drawable || !parent) {
@@ -490,11 +490,6 @@ void ThumbBrowserEntryBase::draw ()
         updateBackBuffer ();
     }
 
-    Gtk::Widget* w = parent->getDrawingArea ();
-
-    Glib::RefPtr<Gdk::Window> win = w->get_window();
-    Cairo::RefPtr<Cairo::Context> cc = win->create_cairo_context();
-
     int w_ = startx + ofsX;
     int h_ = starty + ofsY;
     cc->set_source(backBuffer->getSurface(), w_, h_);

rtgui/thumbbrowserentrybase.h

@@ -119,7 +119,7 @@ public:
 
     void updateBackBuffer   ();
     void resize             (int h);
-    virtual void draw       ();
+    virtual void draw       (Cairo::RefPtr<Cairo::Context> cc);
 
     void addButtonSet       (LWButtonSet* bs);
     int getMinimalHeight    ()