Added copyright lines for files I've edited this year.
[synfig.git] / synfig-studio / trunk / src / gtkmm / workarea.cpp
index e22108a..d7d61c0 100644 (file)
@@ -2,11 +2,12 @@
 /*!    \file workarea.cpp
 **     \brief Template Header
 **
-**     $Id: workarea.cpp,v 1.3 2005/01/16 19:55:57 darco Exp $
+**     $Id$
 **
 **     \legal
 **     Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
-**     Copyright 2006 Yue Shi Lai
+**     Copyright (c) 2006 Yue Shi Lai
+**     Copyright (c) 2007, 2008 Chris Moore
 **
 **     This package is free software; you can redistribute it and/or
 **     modify it under the terms of the GNU General Public License as
@@ -51,6 +52,7 @@
 #include <synfig/target_scanline.h>
 #include <synfig/target_tile.h>
 #include <synfig/surface.h>
+#include <synfig/valuenode_composite.h>
 #include <synfigapp/canvasinterface.h>
 #include "event_mouse.h"
 #include "event_layerclick.h"
@@ -70,6 +72,8 @@
 
 #include <synfig/mutex.h>
 
+#include "general.h"
+
 #endif
 
 /* === U S I N G =========================================================== */
@@ -104,7 +108,7 @@ public:
 
        int twindow_start, twindow_width, twindow_height, twindow_pad;
        int refresh_id;
-       
+
        bool onionskin;
        bool onion_first_tile;
        int onion_layers;
@@ -116,13 +120,13 @@ public:
        void set_onion_skin(bool x)
        {
                onionskin=x;
-               
+
                Time time(rend_desc().get_time_start());
-               
+
                onion_skin_queue.push_back(time);
                //onion_skin_queue.push_back(time-1);
                //onion_skin_queue.push_back(time+1);
-               
+
                try
                {
                        onion_skin_queue.push_back(
@@ -133,7 +137,7 @@ public:
                }
                catch(...)
                {  }
-               
+
                try
                {
                        onion_skin_queue.push_back(
@@ -144,13 +148,13 @@ public:
                }
                catch(...)
                {  }
-               
+
                onion_layers=onion_skin_queue.size();
-               
+
                onion_first_tile=false;
        }
 public:
-       
+
        WorkAreaTarget(WorkArea *workarea,int w, int h):
                workarea(workarea),
                low_res(workarea->get_low_resolution_flag()),
@@ -167,8 +171,9 @@ public:
                set_clipping(true);
                if(low_res)
                {
-                       set_tile_w(workarea->tile_w/2);
-                       set_tile_h(workarea->tile_h/2);
+                       int div = workarea->get_low_res_pixel_size();
+                       set_tile_w(workarea->tile_w/div);
+                       set_tile_h(workarea->tile_h/div);
                }
                else
                {
@@ -178,7 +183,7 @@ public:
                set_canvas(workarea->get_canvas());
                set_quality(workarea->get_quality());
        }
-       
+
        ~WorkAreaTarget()
        {
                workarea->queue_draw();
@@ -188,8 +193,10 @@ public:
        {
                assert(workarea);
                newdesc->set_flags(RendDesc::PX_ASPECT|RendDesc::IM_SPAN);
-               if(low_res)
-                       newdesc->set_wh(w/2,h/2);
+               if(low_res) {
+                       int div = workarea->get_low_res_pixel_size();
+                       newdesc->set_wh(w/div,h/div);
+               }
                else
                        newdesc->set_wh(w,h);
 
@@ -197,7 +204,7 @@ public:
                                workarea->get_w()!=w
                        ||      workarea->get_h()!=h
                ) workarea->set_wh(w,h,4);
-               
+
                workarea->full_frame=false;
 
                desc=*newdesc;
@@ -216,12 +223,12 @@ public:
        virtual int next_frame(Time& time)
        {
                synfig::Mutex::Lock lock(mutex);
-               
+
                if(!onionskin)
                        return synfig::Target_Tile::next_frame(time);
-               
+
                onion_first_tile=(onion_layers==(signed)onion_skin_queue.size());
-               
+
                if(!onion_skin_queue.empty())
                {
                        time=onion_skin_queue.front();
@@ -229,7 +236,7 @@ public:
                }
                else
                        return 0;
-               
+
                return onion_skin_queue.size()+1;
        }
 
@@ -237,17 +244,17 @@ public:
        {
                synfig::Mutex::Lock lock(mutex);
                //if(workarea->tile_queue.empty()) return 0;
-                       
+
                //int curr_tile(workarea->tile_queue.front());
                //workarea->tile_queue.pop_front();
                int curr_tile(workarea->next_unrendered_tile(refresh_id-onion_skin_queue.size()));
                if(curr_tile<0)
                        return 0;
-               
+
                // Width of the image(in tiles)
                int tw(rend_desc().get_w()/get_tile_w());
                if(rend_desc().get_w()%get_tile_w()!=0)tw++;
-                               
+
                y=(curr_tile/tw)*get_tile_w();
                x=(curr_tile%tw)*get_tile_h();
 
@@ -260,8 +267,8 @@ public:
                return total_tiles()-curr_tile+1;
        }
 
-       
-       virtual bool start_frame(synfig::ProgressCallback *cb)
+
+       virtual bool start_frame(synfig::ProgressCallback */*cb*/)
        {
                synfig::Mutex::Lock lock(mutex);
 
@@ -279,16 +286,16 @@ public:
                //tile_iter=workarea->tile_book.begin()+twindow_start;
                return true;
        }
-               
+
        static void free_buff(const guint8 *x) { free(const_cast<guint8*>(x)); }
-       
+
        virtual bool add_tile(const synfig::Surface &surface, int x, int y)
        {
                synfig::Mutex::Lock lock(mutex);
                assert(surface);
-               
+
                PixelFormat pf(PF_RGB);
-               
+
                const int total_bytes(get_tile_w()*get_tile_h()*synfig::channels(pf));
 
                unsigned char *buffer((unsigned char*)malloc(total_bytes));
@@ -301,7 +308,10 @@ public:
                        int w(get_tile_w());
                        int h(get_tile_h());
                        int x(surface.get_w()*surface.get_h());
-                       //if(low_res) { w/=2,h/=2; }
+                       //if(low_res) {
+                       //      int div = workarea->get_low_res_pixel_size();
+                       //      w/=div,h/=div;
+                       //}
                        Color dark(0.6,0.6,0.6);
                        Color lite(0.8,0.8,0.8);
                        for(int i=0;i<x;i++)
@@ -326,7 +336,7 @@ public:
                        return false;
 
                Glib::RefPtr<Gdk::Pixbuf> pixbuf;
-               
+
                pixbuf=Gdk::Pixbuf::create_from_data(
                        buffer, // pointer to the data
                        Gdk::COLORSPACE_RGB, // the colorspace
@@ -336,20 +346,21 @@ public:
                        surface.get_h(),        // height
                        surface.get_w()*synfig::channels(pf), // stride (pitch)
                        sigc::ptr_fun(&WorkAreaTarget::free_buff)
-               );      
+               );
 
                if(low_res)
                {
                        // We need to scale up
+                       int div = workarea->get_low_res_pixel_size();
                        pixbuf=pixbuf->scale_simple(
-                               surface.get_w()*2,
-                               surface.get_h()*2,
+                               surface.get_w()*div,
+                               surface.get_h()*div,
                                Gdk::INTERP_NEAREST
                        );
                }
-               
+
                if(!onionskin || onion_first_tile || !workarea->tile_book[index].first)
-               {                                                       
+               {
                        workarea->tile_book[index].first=pixbuf;
                }
                else
@@ -368,9 +379,9 @@ public:
                                255/(onion_layers-onion_skin_queue.size()+1) //int overall_alpha
                        );
                }
-               
+
                //if(index%2)
-                       workarea->queue_draw();                 
+                       workarea->queue_draw();
                assert(workarea->tile_book[index].first);
                return true;
        }
@@ -393,7 +404,7 @@ public:
 
        int twindow_start, twindow_width, twindow_height, twindow_pad;
        int refresh_id;
-       
+
        bool onionskin;
        bool onion_first_tile;
        int onion_layers;
@@ -405,15 +416,15 @@ public:
        void set_onion_skin(bool x)
        {
                onionskin=x;
-               
+
                Time time(rend_desc().get_time_start());
-               
+
                onion_skin_queue.push_back(time);
                //onion_skin_queue.push_back(time-1);
                //onion_skin_queue.push_back(time+1);
                if(!onionskin)
                        return;
-               
+
                try
                {
                        onion_skin_queue.push_back(
@@ -424,7 +435,7 @@ public:
                }
                catch(...)
                {  }
-               
+
                try
                {
                        onion_skin_queue.push_back(
@@ -435,13 +446,13 @@ public:
                }
                catch(...)
                {  }
-               
+
                onion_layers=onion_skin_queue.size();
-               
+
                onion_first_tile=false;
        }
 public:
-       
+
        WorkAreaTarget_Full(WorkArea *workarea,int w, int h):
                workarea(workarea),
                low_res(workarea->get_low_resolution_flag()),
@@ -454,7 +465,7 @@ public:
                set_canvas(workarea->get_canvas());
                set_quality(workarea->get_quality());
        }
-       
+
        ~WorkAreaTarget_Full()
        {
        }
@@ -464,7 +475,10 @@ public:
                assert(workarea);
                newdesc->set_flags(RendDesc::PX_ASPECT|RendDesc::IM_SPAN);
                if(low_res)
-                       newdesc->set_wh(w/2,h/2);
+               {
+                       int div = workarea->get_low_res_pixel_size();
+                       newdesc->set_wh(w/div,h/div);
+               }
                else
                        newdesc->set_wh(w,h);
 
@@ -472,7 +486,7 @@ public:
                                workarea->get_w()!=w
                        ||      workarea->get_h()!=h
                ) workarea->set_wh(w,h,4);
-               
+
                surface.set_wh(newdesc->get_w(),newdesc->get_h());
 
                desc=*newdesc;
@@ -491,21 +505,21 @@ public:
 
                if(!onionskin)
                        return synfig::Target_Scanline::next_frame(time);
-               
+
                onion_first_tile=(onion_layers==(signed)onion_skin_queue.size());
-               
+
                if(!onion_skin_queue.empty())
                {
                        time=onion_skin_queue.front();
                        onion_skin_queue.pop_front();
                }
                else
-                       return 0;               
+                       return 0;
                return onion_skin_queue.size()+1;
        }
 
-       
-       virtual bool start_frame(synfig::ProgressCallback *cb)
+
+       virtual bool start_frame(synfig::ProgressCallback */*cb*/)
        {
                return true;
        }
@@ -521,13 +535,13 @@ public:
        }
 
        static void free_buff(const guint8 *x) { free(const_cast<guint8*>(x)); }
-       
+
        virtual void end_frame()
        {
                assert(surface);
-               
+
                PixelFormat pf(PF_RGB);
-               
+
                const int total_bytes(surface.get_w()*surface.get_h()*synfig::channels(pf));
 
                unsigned char *buffer((unsigned char*)malloc(total_bytes));
@@ -540,15 +554,19 @@ public:
                        int w(surface.get_w());
                        //int h(surface.get_h());
                        int x(surface.get_w()*surface.get_h());
-                       //if(low_res) { w/=2,h/=2; }
+                       //if(low_res) {
+                       //      int div = workarea->get_low_res_pixel_size();
+                       //      w/=div,h/=div;
+                       //}
                        Color dark(0.6,0.6,0.6);
                        Color lite(0.8,0.8,0.8);
                        int tw=workarea->tile_w;
                        int th=workarea->tile_h;
                        if(low_res)
                        {
-                               tw/=2;
-                               th/=2;
+                               int div = workarea->get_low_res_pixel_size();
+                               tw/=div;
+                               th/=div;
                        }
                        for(int i=0;i<x;i++)
                                dest=Color2PixelFormat(
@@ -564,7 +582,7 @@ public:
                }
 
                Glib::RefPtr<Gdk::Pixbuf> pixbuf;
-               
+
                pixbuf=Gdk::Pixbuf::create_from_data(
                        buffer, // pointer to the data
                        Gdk::COLORSPACE_RGB, // the colorspace
@@ -574,22 +592,23 @@ public:
                        surface.get_h(),        // height
                        surface.get_w()*synfig::channels(pf), // stride (pitch)
                        sigc::ptr_fun(&WorkAreaTarget::free_buff)
-               );      
+               );
 
                if(low_res)
                {
                        // We need to scale up
+                       int div = workarea->get_low_res_pixel_size();
                        pixbuf=pixbuf->scale_simple(
-                               surface.get_w()*2,
-                               surface.get_h()*2,
+                               surface.get_w()*div,
+                               surface.get_h()*div,
                                Gdk::INTERP_NEAREST
                        );
                }
-               
+
                int index=0;
-               
+
                if(!onionskin || onion_first_tile || !workarea->tile_book[index].first)
-               {                                                       
+               {
                        workarea->tile_book[index].first=pixbuf;
                }
                else
@@ -608,8 +627,8 @@ public:
                                255/(onion_layers-onion_skin_queue.size()+1) //int overall_alpha
                        );
                }
-               
-               workarea->queue_draw();                 
+
+               workarea->queue_draw();
                assert(workarea->tile_book[index].first);
        }
 };
@@ -626,15 +645,17 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        canvas(canvas_interface->get_canvas()),
        scrollx_adjustment(0,-4,4,0.01,0.1),
        scrolly_adjustment(0,-4,4,0.01,0.1),
-       w(128),
-       h(128),
+       w(TILE_SIZE),
+       h(TILE_SIZE),
        last_event_time(0),
        progresscallback(0),
        dragging(DRAG_NONE),
        show_grid(false),
-       tile_w(128),
-       tile_h(128)
-{      
+       tile_w(TILE_SIZE),
+       tile_h(TILE_SIZE),
+       timecode_width(0),
+       timecode_height(0)
+{
        show_guides=true;
        curr_input_device=0;
        full_frame=false;
@@ -643,7 +664,8 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        render_idle_func_id=0;
        zoom=prev_zoom=1.0;
        quality=10;
-       rendering=false;        
+       low_res_pixel_size=2;
+       rendering=false;
        canceled_=false;
        low_resolution=true;
        pw=0.001;
@@ -653,7 +675,7 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        queued=false;
        dirty_trap_enabled=false;
        solid_lines=true;
-       
+
        dirty_trap_queued=0;
 
        meta_data_lock=false;
@@ -674,7 +696,7 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
 
        // Not that it really makes a difference... (setting this to zero, that is)
        refreshes=0;
-       
+
        drawing_area=manage(new class Gtk::DrawingArea());
        drawing_area->show();
        drawing_area->set_extension_events(Gdk::EXTENSION_EVENTS_ALL);
@@ -696,9 +718,9 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        drawing_frame->modify_bg(Gtk::STATE_SELECTED,Gdk::Color("#00ff00"));
        */
        //drawing_frame->set_state(Gtk::STATE_NORMAL);
-       
+
        drawing_frame->show();
-       
+
        attach(*drawing_frame, 1, 3+RULER_FIX, 1, 2, Gtk::EXPAND|Gtk::FILL, Gtk::EXPAND|Gtk::FILL, 0, 0);
 
        Gtk::IconSize iconsize=Gtk::IconSize::from_name("synfig-small_icon");
@@ -726,7 +748,7 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        menubutton->signal_pressed().connect(sigc::mem_fun(*this, &WorkArea::popup_menu));
        attach(*menubutton, 0, 1, 0, 1, Gtk::SHRINK, Gtk::SHRINK, 0, 0);
 
-       
+
 
        Gtk::VScrollbar *vscrollbar1 = manage(new class Gtk::VScrollbar(*get_scrolly_adjustment()));
        Gtk::HScrollbar *hscrollbar1 = manage(new class Gtk::HScrollbar(*get_scrollx_adjustment()));
@@ -747,15 +769,15 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        add_events(Gdk::KEY_PRESS_MASK);
        drawing_area->add_events(Gdk::BUTTON_PRESS_MASK | Gdk::BUTTON_RELEASE_MASK);
        drawing_area->add_events(Gdk::BUTTON1_MOTION_MASK | Gdk::BUTTON2_MOTION_MASK |Gdk::POINTER_MOTION_MASK);
-       
+
        // ----------------- Attach signals
-       
+
        drawing_area->signal_expose_event().connect(sigc::mem_fun(*this, &WorkArea::refresh));
        drawing_area->signal_event().connect(sigc::mem_fun(*this, &WorkArea::on_drawing_area_event));
        drawing_area->signal_size_allocate().connect(sigc::hide(sigc::mem_fun(*this, &WorkArea::refresh_dimension_info)));
 
 
-       
+
        canvas_interface->signal_rend_desc_changed().connect(sigc::mem_fun(*this, &WorkArea::refresh_dimension_info));
        // When either of the scrolling adjustments change, then redraw.
        get_scrollx_adjustment()->signal_value_changed().connect(sigc::mem_fun(*this, &WorkArea::queue_scroll));
@@ -779,14 +801,14 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
        set_focus_point(Point(0,0));
 
 
-       load_meta_data();       
+       load_meta_data();
        // Load sketch
        {
                String data(canvas->get_meta_data("sketch"));
                if(!data.empty())
                {
                        if(!load_sketch(data))
-                               load_sketch(dirname(canvas->get_file_name())+ETL_DIRECTORY_SEPERATOR+basename(data));
+                               load_sketch(dirname(canvas->get_file_name())+ETL_DIRECTORY_SEPARATOR+basename(data));
                }
        }
 
@@ -799,6 +821,24 @@ WorkArea::WorkArea(etl::loose_handle<synfigapp::CanvasInterface> canvas_interfac
 WorkArea::~WorkArea()
 {
 //     delete [] buffer;
+
+       // don't leave the render function queued if we are about to vanish;
+       // that causes crashes
+       if(render_idle_func_id)
+               render_idle_func_id=0;
+}
+
+bool
+WorkArea::get_updating()const
+{
+       return App::single_threaded && async_renderer && async_renderer->updating;
+}
+
+void
+WorkArea::stop_updating(bool cancel)
+{
+       async_renderer->stop();
+       if (cancel) canceled_=true;
 }
 
 void
@@ -826,7 +866,7 @@ WorkArea::save_meta_data()
                }
                if(!data.empty())
                        canvas_interface->set_meta_data("guide_x",data);
-               
+
                data.clear();
                for(iter=get_guide_list_y().begin();iter!=get_guide_list_y().end();++iter)
                {
@@ -837,7 +877,7 @@ WorkArea::save_meta_data()
                if(!data.empty())
                        canvas_interface->set_meta_data("guide_y",data);
        }
-       
+
        if(get_sketch_filename().size())
        {
                if(dirname(canvas->get_file_name())==dirname(get_sketch_filename()))
@@ -855,7 +895,7 @@ WorkArea::load_meta_data()
        if(meta_data_lock)
                return;
        meta_data_lock=true;
-       
+
        String data;
 
        data=canvas->get_meta_data("grid_size");
@@ -864,11 +904,13 @@ WorkArea::load_meta_data()
                float gx(get_grid_size()[0]),gy(get_grid_size()[1]);
 
                String::iterator iter(find(data.begin(),data.end(),' '));
-               String tmp(data.begin(),iter);                                          
-               
+               String tmp(data.begin(),iter);
+
                if(!tmp.empty())
                        gx=stratof(tmp);
-               
+               else
+                       synfig::error("WorkArea::load_meta_data(): Unable to parse data for \"grid_size\", which was \"%s\"",data.c_str());
+
                if(iter==data.end())
                        tmp.clear();
                else
@@ -876,11 +918,11 @@ WorkArea::load_meta_data()
 
                if(!tmp.empty())
                        gy=stratof(tmp);
-               
+               else
+                       synfig::error("WorkArea::load_meta_data(): Unable to parse data for \"grid_size\", which was \"%s\"",data.c_str());
+
                set_grid_size(Vector(gx,gy));
        }
-       else
-               synfig::error("WorkArea::load_meta_data(): Unable to parse data for \"grid_size\", which was \"%s\"",data.c_str());
 
        data=canvas->get_meta_data("grid_show");
        if(data.size() && (data=="1" || data[0]=='t' || data[0]=='T'))
@@ -917,34 +959,34 @@ WorkArea::load_meta_data()
                set_onion_skin(true);
        if(data.size() && (data=="0" || data[0]=='f' || data[0]=='F'))
                set_onion_skin(false);
-       
+
        data=canvas->get_meta_data("guide_x");
        get_guide_list_x().clear();
        while(!data.empty())
        {
                String::iterator iter(find(data.begin(),data.end(),' '));
-               String guide(data.begin(),iter);                                                
+               String guide(data.begin(),iter);
 
                if(!guide.empty())
                        get_guide_list_x().push_back(stratof(guide));
-               
+
                if(iter==data.end())
                        data.clear();
                else
                        data=String(iter+1,data.end());
        }
        //sort(get_guide_list_x());
-       
+
        data=canvas->get_meta_data("guide_y");
        get_guide_list_y().clear();
        while(!data.empty())
        {
                String::iterator iter(find(data.begin(),data.end(),' '));
-               String guide(data.begin(),iter);                                                
+               String guide(data.begin(),iter);
 
                if(!guide.empty())
                        get_guide_list_y().push_back(stratof(guide));
-               
+
                if(iter==data.end())
                        data.clear();
                else
@@ -981,7 +1023,7 @@ WorkArea::enable_grid()
        queue_draw();
 }
 
-void 
+void
 WorkArea::disable_grid()
 {
        show_grid=false;
@@ -1039,19 +1081,19 @@ void
 WorkArea::set_focus_point(const synfig::Point &point)
 {
        // These next three lines try to ensure that we place the
-       // focus on a pixel boundry
+       // focus on a pixel boundary
        /*Point adjusted(point[0]/abs(get_pw()),point[1]/abs(get_ph()));
        adjusted[0]=(abs(adjusted[0]-floor(adjusted[0]))<0.5)?floor(adjusted[0])*abs(get_pw()):ceil(adjusted[0])*abs(get_ph());
        adjusted[1]=(abs(adjusted[1]-floor(adjusted[1]))<0.5)?floor(adjusted[1])*abs(get_ph()):ceil(adjusted[1])*abs(get_ph());
        */
        const synfig::Point& adjusted(point);
-       
+
        synfig::RendDesc &rend_desc(get_canvas()->rend_desc());
        Real x_factor=(rend_desc.get_br()[0]-rend_desc.get_tl()[0]>0)?-1:1;
        Real y_factor=(rend_desc.get_br()[1]-rend_desc.get_tl()[1]>0)?-1:1;
 
        get_scrollx_adjustment()->set_value(adjusted[0]*x_factor);
-       get_scrolly_adjustment()->set_value(adjusted[1]*y_factor);      
+       get_scrolly_adjustment()->set_value(adjusted[1]*y_factor);
 }
 
 synfig::Point
@@ -1060,7 +1102,7 @@ WorkArea::get_focus_point()const
        synfig::RendDesc &rend_desc(get_canvas()->rend_desc());
        Real x_factor=(rend_desc.get_br()[0]-rend_desc.get_tl()[0]>0)?-1:1;
        Real y_factor=(rend_desc.get_br()[1]-rend_desc.get_tl()[1]>0)?-1:1;
-       
+
        return synfig::Point(get_scrollx_adjustment()->get_value()*x_factor, get_scrolly_adjustment()->get_value()*y_factor);
 }
 
@@ -1074,11 +1116,11 @@ WorkArea::set_wh(int W, int H,int CHAN)
        }
        if(W<=0 || H<=0 || CHAN<=0)
                return false;
-       
+
        assert(W>0);
        assert(H>0);
        assert(CHAN>0);
-       
+
        // Set all of the parameters
        w=W;
        h=H;
@@ -1087,7 +1129,7 @@ WorkArea::set_wh(int W, int H,int CHAN)
        refresh_dimension_info();
 
        tile_book.clear();
-               
+
        return true;
 }
 
@@ -1098,10 +1140,10 @@ WorkArea::on_key_press_event(GdkEventKey* event)
                return false;
 
        Real multiplier(1.0);
-       
+
        if(Gdk::ModifierType(event->state)&GDK_SHIFT_MASK)
                multiplier=10.0;
-       
+
        Vector nudge;
        switch(event->keyval)
        {
@@ -1121,15 +1163,15 @@ WorkArea::on_key_press_event(GdkEventKey* event)
                        return false;
                        break;
        }
-       
+
        synfigapp::Action::PassiveGrouper grouper(instance.get(),"Nudge");
-       
+
        // Grid snap does not apply to nudging
        bool grid_snap_holder(get_grid_snap());
        bool guide_snap_holder(get_guide_snap());
        set_grid_snap(false);
 
-       try {   
+       try {
                start_duck_drag(get_selected_duck()->get_trans_point());
                translate_selected_ducks(get_selected_duck()->get_trans_point()+nudge*multiplier);
                end_duck_drag();
@@ -1142,7 +1184,7 @@ WorkArea::on_key_press_event(GdkEventKey* event)
 
        set_grid_snap(grid_snap_holder);
        set_guide_snap(guide_snap_holder);
-       
+
        return true;
 }
 
@@ -1156,9 +1198,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
        float pressure(0);
        bool is_mouse(false);
        Gdk::ModifierType modifier(Gdk::ModifierType(0));
-       
-       drawing_area->grab_focus();
-       
+
        // Handle input stuff
        if(
                event->any.type==GDK_MOTION_NOTIFY ||
@@ -1178,9 +1218,10 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                {
                        device=event->button.device;
                        modifier=Gdk::ModifierType(event->button.state);
+                       drawing_area->grab_focus();
                }
-                       
-               // Make sure we recognise the device
+
+               // Make sure we recognize the device
                if(curr_input_device)
                {
                        if(curr_input_device!=device)
@@ -1189,15 +1230,15 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                curr_input_device=device;
                                signal_input_device_changed()(curr_input_device);
                        }
-               }               
+               }
                else if(device)
                {
                        curr_input_device=device;
                        signal_input_device_changed()(curr_input_device);
-               }                       
+               }
 
                assert(curr_input_device);
-               
+
                // Calculate the position of the
                // input device in canvas coordinates
                // and the buttons
@@ -1221,14 +1262,14 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        //synfig::info("pressure=%f",pressure);
                        pressure-=0.04f;
                        pressure/=1.0f-0.04f;
-                       
-                       
+
+
                        assert(!isnan(pressure));
-                       
+
                        mouse_pos=synfig::Point(screen_to_comp_coords(synfig::Point(x,y)));
-                       
+
                        button_pressed=event->button.button;
-                       
+
                        if(button_pressed==1 && pressure<0 && (event->any.type!=GDK_BUTTON_RELEASE && event->any.type!=GDK_BUTTON_PRESS))
                                button_pressed=0;
                        if(pressure<0)
@@ -1236,17 +1277,17 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
 
                        //if(event->any.type==GDK_BUTTON_PRESS && button_pressed)
                        //      synfig::info("Button pressed on input device = %d",event->button.button);
-                       
+
                        //if(event->button.axes[2]>0.1)
                        //      button_pressed=1;
                        //else
-                       //      button_pressed=0;                               
+                       //      button_pressed=0;
                }
        }
        // GDK mouse scrolling events
        else if(event->any.type==GDK_SCROLL)
        {
-               // GDK information needed to properly interprete mouse
+               // GDK information needed to properly interpret mouse
                // scrolling events are: scroll.state, scroll.x/scroll.y, and
                // scroll.direction. The value of scroll.direction will be
                // obtained later.
@@ -1277,49 +1318,70 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                switch(button_pressed)
                {
                case 1: // Attempt to click on a duck
-               {       
+               {
                        etl::handle<Duck> duck;
                        dragging=DRAG_NONE;
-                       
+
                        if(allow_duck_clicks)
                        {
                                duck=find_duck(mouse_pos,radius);
-                               
+
                                if(duck)
                                {
-                                       clicked_duck=0;
+                                       // make a note of whether the duck we click on was selected or not
                                        if(duck_is_selected(duck))
-                                       {
                                                clicked_duck=duck;
-                                       }
                                        else
                                        {
-                                               if(modifier&GDK_SHIFT_MASK)
-                                               {
-                                                       select_duck(duck);
-                                               }
-                                               else if(modifier&GDK_CONTROL_MASK)
-                                               {
-                                                       select_duck(duck);
-                                               }
-                                               else
-                                               {
+                                               clicked_duck=0;
+                                               // if CTRL isn't pressed, clicking an unselected duck will unselect all other ducks
+                                               if(!(modifier&GDK_CONTROL_MASK))
                                                        clear_selected_ducks();
-                                                       select_duck(duck);
-                                               }
+                                               select_duck(duck);
                                        }
                                }
                        }
                        //else
                        //      clear_selected_ducks();
-                               
-               
-               
+
+
+
                        selected_bezier=find_bezier(mouse_pos,radius,&bezier_click_pos);
                        if(duck && duck->get_editable())
                        {
                                //get_selected_duck()->signal_user_click(0)();
                                //if(clicked_duck)clicked_duck->signal_user_click(0)();
+
+                               // if the user is holding shift while clicking on a tangent duck, consider splitting the tangent
+                               if (event->motion.state&GDK_SHIFT_MASK && duck->get_type() == Duck::TYPE_TANGENT)
+                               {
+                                       synfigapp::ValueDesc value_desc = duck->get_value_desc();
+
+                                       // we have the tangent, but need the vertex - that's the parent
+                                       if (value_desc.parent_is_value_node()) {
+                                               ValueNode_Composite::Handle parent_value_node = value_desc.get_parent_value_node();
+
+                                               // if the tangent isn't split, then split it
+                                               if (!((*(parent_value_node->get_link("split")))(get_time()).get(bool())))
+                                               {
+                                                       get_canvas_view()->canvas_interface()->
+                                                               change_value(synfigapp::ValueDesc(parent_value_node,
+                                                                                                                                 parent_value_node->get_link_index_from_name("split")),
+                                                                                        true);
+                                                       // rebuild the ducks from scratch, so the tangents ducks aren't connected
+                                                       get_canvas_view()->rebuild_ducks();
+
+                                                       // reprocess the mouse click
+                                                       return on_drawing_area_event(event);
+                                               }
+                                       } else {
+                                               // I don't know how to access the vertex from the tangent duck when originally drawing the bline in the bline tool
+
+                                               // synfig::ValueNode::Handle vn = value_desc.get_value_node();
+                                               synfig::info("parent isn't value node?  shift-drag-tangent doesn't work in bline tool yet...");
+                                       }
+                               }
+
                                dragging=DRAG_DUCK;
                                drag_point=mouse_pos;
                                //drawing_area->queue_draw();
@@ -1329,7 +1391,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        }
 // I commented out this section because
 // it was causing issues when rotoscoping.
-// At the moment, we don't need it, so 
+// At the moment, we don't need it, so
 // this was the easiest way to fix the problem.
 /*
                        else
@@ -1347,7 +1409,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                {
                                        // Check for a guide click
                                        GuideList::iterator iter;
-                                       
+
                                        iter=find_guide_x(mouse_pos,radius);
                                        if(iter==get_guide_list_x().end())
                                        {
@@ -1395,33 +1457,29 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                {
                        etl::handle<Duck> duck=find_duck(mouse_pos,radius);
                        etl::handle<Bezier> bezier=find_bezier(mouse_pos,radius,&bezier_click_pos);
-                       
+
                        Layer::Handle layer(get_canvas()->find_layer(mouse_pos));
                        if(duck)
                        {
                                if(get_selected_ducks().size()<=1)
                                        duck->signal_user_click(2)();
                                else
-                               {
                                        canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MULTIPLE_DUCKS_CLICKED,BUTTON_RIGHT,mouse_pos,pressure,modifier));
-                               }
                                return true;
                        }
-                       else
-                       if(bezier)
+                       else if(bezier)
                        {
                                bezier->signal_user_click(2)(bezier_click_pos);
                                return true;
                        }
-                       else 
-                       if(layer)
+                       else if (layer)
                        {
-                               if(canvas_view->get_smach().process_event(EventLayerClick(layer,BUTTON_RIGHT,mouse_pos))==Smach::RESULT_OK)                                             
+                               if(canvas_view->get_smach().process_event(EventLayerClick(layer,BUTTON_RIGHT,mouse_pos))==Smach::RESULT_OK)
                                        return false;
                                return true;
                        }
                        else
-                               canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,BUTTON_RIGHT,mouse_pos,pressure,modifier));                  
+                               canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,BUTTON_RIGHT,mouse_pos,pressure,modifier));
                        /*
                        if(canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DOWN,BUTTON_RIGHT,mouse_pos,pressure,modifier))==Smach::RESULT_OK)
                        {
@@ -1451,16 +1509,16 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        last_event_time=event->motion.time;
 
                signal_cursor_moved_();
-       
-               // Guide/Duck hilights on hover
+
+               // Guide/Duck highlights on hover
                if(dragging==DRAG_NONE)
                {
                        GuideList::iterator iter;
-                       
+
                        iter=find_guide_x(mouse_pos,radius);
                        if(iter==get_guide_list_x().end())
                                iter=find_guide_y(mouse_pos,radius);
-                       
+
                        if(iter!=curr_guide)
                        {
                                curr_guide=iter;
@@ -1476,7 +1534,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        }
                }
 
-       
+
                if(dragging==DRAG_DUCK)
                {
                        if(canvas_view->get_cancel_status())
@@ -1494,20 +1552,22 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        }
                        selected_duck->set_point(point);
                        */
-                       
+
                        //Point p(mouse_pos);
-                       
+
                        set_axis_lock(event->motion.state&GDK_SHIFT_MASK);
-                       
+
                        translate_selected_ducks(mouse_pos);
-                       
+
                        drawing_area->queue_draw();
                }
+
                if(dragging==DRAG_BOX)
                {
                        curr_point=mouse_pos;
                        drawing_area->queue_draw();
                }
+
                if(dragging==DRAG_GUIDE)
                {
                        if(curr_guide_is_x)
@@ -1516,30 +1576,34 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                *curr_guide=mouse_pos[1];
                        drawing_area->queue_draw();
                }
+
                if(dragging!=DRAG_WINDOW)
                {       // Update those triangle things on the rulers
                        const synfig::Point point(mouse_pos);
                        hruler->property_position()=Distance(point[0],Distance::SYSTEM_UNITS).get(App::distance_system,get_canvas()->rend_desc());
                        vruler->property_position()=Distance(point[1],Distance::SYSTEM_UNITS).get(App::distance_system,get_canvas()->rend_desc());
                }
-               if(dragging==DRAG_WINDOW)
-               {
-                       set_focus_point(get_focus_point()+mouse_pos-drag_point);
-               }
-               else
-               if(event->motion.state&GDK_BUTTON1_MASK && canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,BUTTON_LEFT,mouse_pos,pressure,modifier))==Smach::RESULT_ACCEPT)
+
+               if(dragging == DRAG_WINDOW)
+                       set_focus_point(get_focus_point() + mouse_pos-drag_point);
+               else if (event->motion.state & GDK_BUTTON1_MASK &&
+                               canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG, BUTTON_LEFT,
+                                                                                                                                 mouse_pos,pressure,modifier)) == Smach::RESULT_ACCEPT)
                        return true;
-               else
-               if(event->motion.state&GDK_BUTTON2_MASK && canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,BUTTON_MIDDLE,mouse_pos,pressure,modifier))==Smach::RESULT_ACCEPT)
+               else if (event->motion.state & GDK_BUTTON2_MASK &&
+                                canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG, BUTTON_MIDDLE,
+                                                                                                                                  mouse_pos, pressure, modifier)) == Smach::RESULT_ACCEPT)
                        return true;
-               else
-               if(event->motion.state&GDK_BUTTON3_MASK && canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG,BUTTON_RIGHT,mouse_pos,pressure,modifier))==Smach::RESULT_ACCEPT)
+               else if (event->motion.state & GDK_BUTTON3_MASK &&
+                                canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_DRAG, BUTTON_RIGHT,
+                                                                                                                                  mouse_pos, pressure, modifier)) == Smach::RESULT_ACCEPT)
                        return true;
-               else
-               if(canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_MOTION,BUTTON_NONE,mouse_pos,pressure,modifier))==Smach::RESULT_ACCEPT)
+               else if(canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_MOTION, BUTTON_NONE,
+                                                                                                                                 mouse_pos, pressure,modifier)) == Smach::RESULT_ACCEPT)
                        return true;
 
                break;
+
        case GDK_BUTTON_RELEASE:
        {
                bool ret(false);
@@ -1552,12 +1616,12 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                }
                else
                if(dragging==DRAG_DUCK)
-               {                       
+               {
                        synfigapp::Action::PassiveGrouper grouper(instance.get(),"Move");
                        dragging=DRAG_NONE;
                        //translate_selected_ducks(mouse_pos);
                        set_axis_lock(false);
-                       
+
                        try{
                        get_canvas_view()->duck_refresh_flag=false;
                        get_canvas_view()->duck_refresh_needed=false;
@@ -1565,37 +1629,20 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        get_canvas_view()->duck_refresh_flag=true;
                        if(!drag_did_anything)
                        {
-                               //etl::handle<Duck> duck=find_duck(mouse_pos,radius);
-                               
-                               if(modifier&GDK_SHIFT_MASK)
+                               // if we originally clicked on a selected duck ...
+                               if(clicked_duck)
                                {
-                                       //synfig::info("DUCK_DRAG_RELEASE: SHIFT-MASK ON!");
-                                       if(clicked_duck)
-                                       {
-                                               //synfig::info("DUCK_DRAG_RELEASE: CLICKED DUCK!");
+                                       // ... and CTRL is pressed, then just toggle the clicked duck
+                                       //     otherwise make the clicked duck the only selected duck
+                                       if(modifier&GDK_CONTROL_MASK)
                                                unselect_duck(clicked_duck);
-                                       }
-                               }
-                               else if(modifier&GDK_CONTROL_MASK)
-                               {
-                                       //synfig::info("DUCK_DRAG_RELEASE: CONTROL-MASK ON!");
-                                       if(clicked_duck)
-                                       {
-                                               //synfig::info("DUCK_DRAG_RELEASE: CLICKED DUCK!");
-                                               unselect_duck(clicked_duck);
-                                       }
-                               }
-                               else
-                               {
-                                       //synfig::info("DUCK_DRAG_RELEASE: NO MASK!");
-                                       if(clicked_duck)
+                                       else
                                        {
-                                               //synfig::info("DUCK_DRAG_RELEASE: CLICKED DUCK!");
                                                clear_selected_ducks();
                                                select_duck(clicked_duck);
                                        }
-                               }               
-                               if(clicked_duck)clicked_duck->signal_user_click(0)();
+                                       clicked_duck->signal_user_click(0)();
+                               }
                        }
                        else
                        {
@@ -1614,28 +1661,37 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
 
                        ret=true;
                }
-               
+
                if(dragging==DRAG_BOX)
-               {                       
+               {
                        dragging=DRAG_NONE;
                        if((drag_point-mouse_pos).mag()>radius/2.0f)
                        {
                                if(canvas_view->get_smach().process_event(EventBox(drag_point,mouse_pos,MouseButton(event->button.button),modifier))==Smach::RESULT_ACCEPT)
                                        return true;
 
-                               if(!(modifier&GDK_CONTROL_MASK) && !(modifier&GDK_SHIFT_MASK))
+                               // when dragging a box around some ducks:
+                               // SHIFT selects; CTRL toggles; SHIFT+CTRL unselects; <none> clears all then selects
+                               if(modifier&GDK_SHIFT_MASK)
+                                       select_ducks_in_box(drag_point,mouse_pos);
+
+                               if(modifier&GDK_CONTROL_MASK)
+                                       toggle_select_ducks_in_box(drag_point,mouse_pos);
+                               else if(!(modifier&GDK_SHIFT_MASK))
+                               {
                                        clear_selected_ducks();
-                               select_ducks_in_box(drag_point,mouse_pos);
+                                       select_ducks_in_box(drag_point,mouse_pos);
+                               }
                                ret=true;
                        }
                        else
-                       {       
+                       {
                                if(allow_layer_clicks)
                                {
                                        Layer::Handle layer(get_canvas()->find_layer(drag_point));
                                        //if(layer)
                                        {
-                                               if(canvas_view->get_smach().process_event(EventLayerClick(layer,BUTTON_LEFT,mouse_pos,modifier))==Smach::RESULT_OK)                                             
+                                               if(canvas_view->get_smach().process_event(EventLayerClick(layer,BUTTON_LEFT,mouse_pos,modifier))==Smach::RESULT_OK)
                                                        signal_layer_selected_(layer);
                                                ret=true;
                                        }
@@ -1646,12 +1702,12 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                }
                        }
                }
-               
+
                dragging=DRAG_NONE;
 
                if(canvas_view->get_smach().process_event(EventMouse(EVENT_WORKAREA_MOUSE_BUTTON_UP,MouseButton(event->button.button),mouse_pos,pressure,modifier))==Smach::RESULT_ACCEPT)
                        ret=true;
-               
+
                return ret;
        }
                break;
@@ -1666,7 +1722,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
 
                if(modifier&GDK_CONTROL_MASK)
                {
-                       
+
                        // The zoom is performed while preserving the pointer
                        // position as a fixed point (similarly to Xara Xtreme and
                        // Inkscape).
@@ -1689,11 +1745,13 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                        switch(event->scroll.direction)
                        {
                                case GDK_SCROLL_UP:
+                               case GDK_SCROLL_RIGHT:
                                        get_scrollx_adjustment()->set_value(scroll_point[0]+(mouse_pos[0]-scroll_point[0])*(1.25-(1+drift)));
                                        get_scrolly_adjustment()->set_value(scroll_point[1]-(mouse_pos[1]+scroll_point[1])*(1.25-(1+drift)));
                                        zoom_in();
                                        break;
                                case GDK_SCROLL_DOWN:
+                               case GDK_SCROLL_LEFT:
                                        get_scrollx_adjustment()->set_value(scroll_point[0]+(mouse_pos[0]-scroll_point[0])*(1/1.25-(1+drift)));
                                        get_scrolly_adjustment()->set_value(scroll_point[1]-(mouse_pos[1]+scroll_point[1])*(1/1.25-(1+drift)));
                                        zoom_out();
@@ -1719,12 +1777,18 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                case GDK_SCROLL_DOWN:
                                        get_scrollx_adjustment()->set_value(get_scrollx_adjustment()->get_value()+scroll_pixel*pw);
                                        break;
+                               case GDK_SCROLL_LEFT:
+                                       get_scrolly_adjustment()->set_value(get_scrolly_adjustment()->get_value()+scroll_pixel*ph);
+                                       break;
+                               case GDK_SCROLL_RIGHT:
+                                       get_scrolly_adjustment()->set_value(get_scrolly_adjustment()->get_value()-scroll_pixel*ph);
+                                       break;
                                default:
                                        break;
                        }
                }
                else
-               {       
+               {
                        // Scroll in either direction by 20 pixels. Ideally, the
                        // amount of pixels per scrolling event should be
                        // configurable. Xara Xtreme currently uses an (hard
@@ -1740,6 +1804,12 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
                                case GDK_SCROLL_DOWN:
                                        get_scrolly_adjustment()->set_value(get_scrolly_adjustment()->get_value()-scroll_pixel*ph);
                                        break;
+                               case GDK_SCROLL_LEFT:
+                                       get_scrollx_adjustment()->set_value(get_scrollx_adjustment()->get_value()-scroll_pixel*pw);
+                                       break;
+                               case GDK_SCROLL_RIGHT:
+                                       get_scrollx_adjustment()->set_value(get_scrollx_adjustment()->get_value()+scroll_pixel*pw);
+                                       break;
                                default:
                                        break;
                        }
@@ -1753,7 +1823,7 @@ WorkArea::on_drawing_area_event(GdkEvent *event)
 }
 
 bool
-WorkArea::on_hruler_event(GdkEvent *event)
+WorkArea::on_hruler_event(GdkEvent */*event*/)
 {
 /*
        switch(event->type)
@@ -1783,17 +1853,17 @@ WorkArea::on_hruler_event(GdkEvent *event)
                                x=event->button.x;
                                y=event->button.y;
                        }
-                       
+
                        if(isnan(y) || isnan(x))
-                               return false;                   
-                       
+                               return false;
+
                        *curr_guide=synfig::Point(screen_to_comp_coords(synfig::Point(x,y)))[1];
 
                        queue_draw();
                }
                return true;
                break;
-               
+
        case GDK_BUTTON_RELEASE:
                if(dragging==DRAG_GUIDE && curr_guide_is_x==false)
                {
@@ -1810,16 +1880,14 @@ WorkArea::on_hruler_event(GdkEvent *event)
 }
 
 bool
-WorkArea::on_vruler_event(GdkEvent *event)
+WorkArea::on_vruler_event(GdkEvent */*event*/)
 {
 /*
        switch(event->type)
     {
        case GDK_BUTTON_PRESS:
-               DEBUGPOINT();
                if(dragging==DRAG_NONE)
                {
-                       DEBUGPOINT();
                        dragging=DRAG_GUIDE;
                        curr_guide=get_guide_list_x().insert(get_guide_list_x().begin());
                        curr_guide_is_x=true;
@@ -1827,10 +1895,8 @@ WorkArea::on_vruler_event(GdkEvent *event)
                return true;
                break;
        case GDK_BUTTON_RELEASE:
-               DEBUGPOINT();
                if(dragging==DRAG_GUIDE && curr_guide_is_x==true)
                {
-                       DEBUGPOINT();
                        dragging=DRAG_NONE;
                        get_guide_list_x().erase(curr_guide);
                }
@@ -1853,7 +1919,10 @@ WorkArea::refresh_dimension_info()
        canvasheight=rend_desc.get_br()[1]-rend_desc.get_tl()[1];
 
        pw=canvaswidth/w;
-       ph=canvasheight/h;      
+       ph=canvasheight/h;
+
+       Duckmatic::set_flip_x(pw < 0);
+       Duckmatic::set_flip_y(ph > 0);
 
        scrollx_adjustment.set_page_increment(abs(get_grid_size()[0]));
        scrollx_adjustment.set_step_increment(abs(pw));
@@ -1865,20 +1934,20 @@ WorkArea::refresh_dimension_info()
        scrolly_adjustment.set_page_increment(abs(get_grid_size()[1]));
 
 
-       
+
        if(drawing_area->get_width()<=0 || drawing_area->get_height()<=0 || w==0 || h==0)
                return;
-       
+
        const synfig::Point focus_point(get_focus_point());
        const synfig::Real x(focus_point[0]/pw+drawing_area->get_width()/2-w/2);
        const synfig::Real y(focus_point[1]/ph+drawing_area->get_height()/2-h/2);
-       
+
        window_tl[0]=rend_desc.get_tl()[0]-pw*x;
        window_br[0]=rend_desc.get_br()[0]+pw*(drawing_area->get_width()-x-w);
 
        window_tl[1]=rend_desc.get_tl()[1]-ph*y;
        window_br[1]=rend_desc.get_br()[1]+ph*(drawing_area->get_height()-y-h);
-       
+
        hruler->property_lower()=Distance(window_tl[0],Distance::SYSTEM_UNITS).get(App::distance_system,rend_desc);
        hruler->property_upper()=Distance(window_br[0],Distance::SYSTEM_UNITS).get(App::distance_system,rend_desc);
        vruler->property_lower()=Distance(window_tl[1],Distance::SYSTEM_UNITS).get(App::distance_system,rend_desc);
@@ -1904,7 +1973,7 @@ WorkArea::screen_to_comp_coords(synfig::Point pos)const
 }
 
 synfig::Point
-WorkArea::comp_to_screen_coords(synfig::Point pos)const
+WorkArea::comp_to_screen_coords(synfig::Point /*pos*/)const
 {
        synfig::warning("WorkArea::comp_to_screen_coords: Not yet implemented");
        return synfig::Point();
@@ -1918,32 +1987,33 @@ WorkArea::next_unrendered_tile(int refreshes)const
                return -1;
 
        //const synfig::RendDesc &rend_desc(get_canvas()->rend_desc());
-       
+
        const synfig::Vector focus_point(get_focus_point());
-       
+
        // Calculate the window coordinates of the top-left
        // corner of the canvas.
        const synfig::Vector::value_type
                x(focus_point[0]/pw+drawing_area->get_width()/2-w/2),
                y(focus_point[1]/ph+drawing_area->get_height()/2-h/2);
-       
-       const int width_in_tiles(w/tile_w+(w%tile_w?1:0));
+
+       int div = low_res_pixel_size;
+       const int width_in_tiles(w/tile_w+((low_resolution?((w/div)%(tile_w/div)):(w%tile_w))?1:0));
        const int height_in_tiles(h/tile_h+(h%tile_h?1:0));
-                       
+
        int
                u(0),v(0),
                u1(int(-x/tile_w)),
                v1(int(-y/tile_h)),
                u2(int((-x+drawing_area->get_width())/tile_w+1)),
                v2(int((-y+drawing_area->get_height())/tile_h+1));
-       
+
        if(u2>width_in_tiles)u2=width_in_tiles;
        if(v2>height_in_tiles)v2=height_in_tiles;
        if(u1<0)u1=0;
        if(v1<0)v1=0;
-               
+
        int last_good_tile(-1);
-       
+
        for(v=v1;v<v2;v++)
                for(u=u1;u<u2;u++)
                {
@@ -1966,7 +2036,7 @@ private:
        F func;
 public:
        handle2ptr_t(const F &func):func(func) { };
-       
+
        R operator()(typename etl::handle<T> x) { return func(*x); }
 };
 
@@ -1999,14 +2069,14 @@ WorkArea::refresh(GdkEventExpose*event)
        assert(get_canvas());
 
        drawing_area->get_window()->clear();
-       
+
        //const synfig::RendDesc &rend_desc(get_canvas()->rend_desc());
-       
+
        const synfig::Vector focus_point(get_focus_point());
-       
+
        // Update the old focus point
        last_focus_point=focus_point;
-       
+
        // Draw out the renderables
        {
                std::set<etl::handle<WorkAreaRenderer> >::iterator iter;
@@ -2019,8 +2089,7 @@ WorkArea::refresh(GdkEventExpose*event)
                                );
                }
        }
-       
-       
+
        // Calculate the window coordinates of the top-left
        // corner of the canvas.
        //const synfig::Vector::value_type
@@ -2031,32 +2100,36 @@ WorkArea::refresh(GdkEventExpose*event)
        //const synfig::Vector::value_type window_endx(window_br[0]);
        //const synfig::Vector::value_type window_starty(window_tl[1]);
        //const synfig::Vector::value_type window_endy(window_br[1]);
-       
-       Glib::RefPtr<Gdk::GC> gc=Gdk::GC::create(drawing_area->get_window());
-
 
+       Glib::RefPtr<Gdk::GC> gc=Gdk::GC::create(drawing_area->get_window());
 
        // If we are in animate mode, draw a red border around the screen
        if(canvas_interface->get_mode()&synfigapp::MODE_ANIMATE)
        {
-               /*gc->set_rgb_fg_color(Gdk::Color("#FF0000"));
-               gc->set_line_attributes(1,Gdk::LINE_SOLID,Gdk::CAP_BUTT,Gdk::JOIN_MITER);       
+// #define USE_FRAME_BACKGROUND_TO_SHOW_EDIT_MODE
+#ifdef USE_FRAME_BACKGROUND_TO_SHOW_EDIT_MODE
+               // This method of drawing the red border doesn't work on any
+               // Gtk theme which uses the crux-engine, hcengine, industrial,
+               // mist, or ubuntulooks engine, such as the default ubuntu
+               // 'Human' theme.
+               drawing_frame->modify_bg(Gtk::STATE_NORMAL,Gdk::Color("#FF0000"));
+#else
+               // So let's do it in a more primitive fashion.
+               gc->set_rgb_fg_color(Gdk::Color("#FF0000"));
+               gc->set_line_attributes(1,Gdk::LINE_SOLID,Gdk::CAP_BUTT,Gdk::JOIN_MITER);
                drawing_area->get_window()->draw_rectangle(
                        gc,
                        false,  // Fill?
                        0,0,    // x,y
-                       drawing_area->get_width()-1,drawing_area->get_height()-1        //w,h
-               );
-               */
-               drawing_frame->modify_bg(Gtk::STATE_NORMAL,Gdk::Color("#FF0000"));
-               //get_window()->set_background(Gdk::Color("#FF0000"));
+                       drawing_area->get_width()-1,drawing_area->get_height()-1); // w,h
+#endif
        }
+#ifdef USE_FRAME_BACKGROUND_TO_SHOW_EDIT_MODE
        else
                drawing_frame->unset_bg(Gtk::STATE_NORMAL);
+#endif
 
-
-
-       previous_focus=get_focus_point();       
+       previous_focus=get_focus_point();
 
        return true;
 }
@@ -2090,7 +2163,17 @@ WorkArea::set_quality(int x)
        queue_render_preview();
 }
 
+void
+WorkArea::set_low_res_pixel_size(int x)
+{
+       if(x==low_res_pixel_size)
+               return;
+       low_res_pixel_size=x;
+       queue_render_preview();
+}
 
+namespace studio
+{
 class WorkAreaProgress : public synfig::ProgressCallback
 {
        WorkArea *work_area;
@@ -2128,10 +2211,18 @@ public:
                return cb->amount_complete(current,total);
        }
 };
+}
 
 bool
 studio::WorkArea::async_update_preview()
 {
+       if (get_updating())
+       {
+               stop_updating();
+               queue_render_preview();
+               return false;
+       }
+
        async_renderer=0;
 
        queued=false;
@@ -2141,43 +2232,52 @@ studio::WorkArea::async_update_preview()
        // This object will mark us as busy until
        // we are done.
        //studio::App::Busy busy;
-       
+
        //WorkAreaProgress callback(this,get_canvas_view()->get_ui_interface().get());
        //synfig::ProgressCallback *cb=&callback;
 
        if(!is_visible())return false;
-       
+
        /*
        // If we are queued to render the scene at the next idle
-       // go ahead and de-queue it. 
+       // go ahead and de-queue it.
        if(render_idle_func_id)
        {
-               g_source_remove(render_idle_func_id);           
+               g_source_remove(render_idle_func_id);
                //queued=false;
                render_idle_func_id=0;
        }
        */
-       
+
        dirty=false;
        get_canvas_view()->reset_cancel_status();
-       
+
        //bool ret=false;
        RendDesc desc=get_canvas()->rend_desc();
-       
+
        int w=(int)(desc.get_w()*zoom);
        int h=(int)(desc.get_h()*zoom);
-               
+
+       // ensure that the size we draw is at least one pixel in each dimension
+       int min_size = low_resolution ? low_res_pixel_size : 1;
+       if (w < min_size) w = min_size;
+       if (h < min_size) h = min_size;
+
        // Setup the description parameters
-       desc.set_antialias(1);  
+       desc.set_antialias(1);
        desc.set_time(cur_time);
-       
+
        set_rend_desc(desc);
 
        // Create the render target
        handle<Target> target;
-       
-       if(w*h>(low_resolution?480*270:480*270/2))
+
+       // if we have lots of pixels to render and the tile renderer isn't disabled, use it
+       int div;
+       div = low_resolution ? low_res_pixel_size : 1;
+       if (w*h > 240*div*135*div && !getenv("SYNFIG_DISABLE_TILE_RENDER"))
        {
+               // do a tile render
                handle<WorkAreaTarget> trgt(new class WorkAreaTarget(this,w,h));
 
                trgt->set_rend_desc(&desc);
@@ -2186,13 +2286,14 @@ studio::WorkArea::async_update_preview()
        }
        else
        {
+               // do a scanline render
                handle<WorkAreaTarget_Full> trgt(new class WorkAreaTarget_Full(this,w,h));
 
                trgt->set_rend_desc(&desc);
                trgt->set_onion_skin(get_onion_skin());
                target=trgt;
        }
-       
+
        // We can rest assured that our time has already
        // been set, so there is no need to have to
        // recalculate that over again.
@@ -2210,13 +2311,13 @@ studio::WorkArea::async_update_preview()
        synfig::ProgressCallback *cb=get_canvas_view()->get_ui_interface().get();
 
        rendering=true;
-       cb->task("Rendering...");
+       cb->task(_("Rendering..."));
        rendering=true;
-       
+
        return true;
 }
 
-void 
+void
 studio::WorkArea::async_update_finished()
 {
        synfig::ProgressCallback *cb=get_canvas_view()->get_ui_interface().get();
@@ -2225,19 +2326,19 @@ studio::WorkArea::async_update_finished()
 
        if(!async_renderer)
                return;
-       
-       // If we completed successfuly, then
+
+       // If we completed successfully, then
        // we aren't dirty anymore
        if(async_renderer->has_success())
        {
                dirty=false;
                //queued=false;
-               cb->task("Idle");
+               cb->task(_("Idle"));
        }
        else
        {
                dirty=true;
-               cb->task("Render Failed");
+               cb->task(_("Render Failed"));
        }
        //get_canvas_view()->reset_cancel_status();
        done_rendering();
@@ -2257,10 +2358,10 @@ again:
        // This object will mark us as busy until
        // we are done.
        studio::App::Busy busy;
-       
+
        WorkAreaProgress callback(this,get_canvas_view()->get_ui_interface().get());
        synfig::ProgressCallback *cb=&callback;
-       
+
        // We don't want to render if we are already rendering
        if(rendering)
        {
@@ -2269,36 +2370,35 @@ again:
        }
 
        if(!is_visible())return false;
-       get_canvas()->set_time(get_time());     
+       get_canvas()->set_time(get_time());
        get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
        signal_rendering()();
-       
+
        // If we are queued to render the scene at the next idle
-       // go ahead and de-queue it. 
+       // go ahead and de-queue it.
        if(render_idle_func_id)
        {
-               g_source_remove(render_idle_func_id);           
+               g_source_remove(render_idle_func_id);
                //queued=false;
                render_idle_func_id=0;
        }
        // Start rendering
        rendering=true;
-       
+
        dirty=false;
        get_canvas_view()->reset_cancel_status();
-       
-       bool ret=false;
+
        RendDesc desc=get_canvas()->rend_desc();
        //newdesc->set_flags(RendDesc::PX_ASPECT|RendDesc::IM_SPAN);
-       
+
        int w=(int)(desc.get_w()*zoom);
        int h=(int)(desc.get_h()*zoom);
-               
+
        // Setup the description parameters
-       desc.set_antialias(1);  
+       desc.set_antialias(1);
        desc.set_time(cur_time);
        //desc.set_wh(w,h);
-       
+
        set_rend_desc(desc);
 
        // Create the render target
@@ -2310,12 +2410,12 @@ again:
        // been set, so there is no need to have to
        // recalculate that over again.
        target->set_avoid_time_sync(true);
-       
+
        if(cb)
-               cb->task(strprintf("Rendering canvas %s...",get_canvas()->get_name().c_str()));
+               cb->task(strprintf(_("Rendering canvas %s..."),get_canvas()->get_name().c_str()));
+
+       bool ret = target->render(cb);
 
-       target->render(cb);
-       
        if(!ret && !get_canvas_view()->get_cancel_status() && dirty)
        {
                rendering=false;
@@ -2324,21 +2424,21 @@ again:
        }
        if(get_canvas_view()->get_cancel_status())
                canceled_=true;
-       
+
        if(cb)
        {
                if(ret)
-                       cb->task("Idle");
+                       cb->task(_("Idle"));
                else
-                       cb->task("Render Failed");
-               cb->amount_complete(0,1);                       
+                       cb->task(_("Render Failed"));
+               cb->amount_complete(0,1);
        }
 
        // Refresh the work area to make sure that
        // it is being displayed correctly
        drawing_area->queue_draw();
-               
-       // If we completed successfuly, then
+
+       // If we completed successfully, then
        // we aren't dirty anymore
        if(ret)
        {
@@ -2353,7 +2453,7 @@ again:
 }
 
 void
-studio::WorkArea::async_render_preview(Time time)
+studio::WorkArea::async_render_preview(synfig::Time time)
 {
        cur_time=time;
        //tile_book.clear();
@@ -2361,7 +2461,7 @@ studio::WorkArea::async_render_preview(Time time)
        refreshes+=5;
        if(!is_visible())return;
 
-       get_canvas()->set_time(get_time());     
+       get_canvas()->set_time(get_time());
        get_canvas_view()->get_smach().process_event(EVENT_REFRESH_DUCKS);
        signal_rendering()();
 
@@ -2374,7 +2474,7 @@ WorkArea::async_render_preview()
 }
 
 bool
-studio::WorkArea::sync_render_preview(Time time)
+studio::WorkArea::sync_render_preview(synfig::Time time)
 {
        cur_time=time;
        //tile_book.clear();
@@ -2399,9 +2499,9 @@ void
 WorkArea::queue_scroll()
 {
 //     const synfig::RendDesc &rend_desc(get_canvas()->rend_desc());
-       
+
        const synfig::Point focus_point(get_focus_point());
-       
+
        const synfig::Real
                new_x(focus_point[0]/pw+drawing_area->get_width()/2-w/2),
                new_y(focus_point[1]/ph+drawing_area->get_height()/2-h/2);
@@ -2415,18 +2515,46 @@ WorkArea::queue_scroll()
                return;
 
        const int
-               dx(round_to_int(old_x)-round_to_int(new_x)),    
+               dx(round_to_int(old_x)-round_to_int(new_x)),
                dy(round_to_int(old_y)-round_to_int(new_y));
-       
+
        drawing_area->get_window()->scroll(-dx,-dy);
 
-       /*drawing_area->queue_draw_area(
-               0,
-               0,
-               128,
-               64
-       );
-       */
+       if (timecode_width && timecode_height)
+       {
+               drawing_area->queue_draw_area(4,       4,    4+timecode_width,    4+timecode_height);
+               drawing_area->queue_draw_area(4-dx, 4-dy, 4-dx+timecode_width, 4-dy+timecode_height);
+       }
+
+#ifndef USE_FRAME_BACKGROUND_TO_SHOW_EDIT_MODE
+       if(canvas_interface->get_mode()&synfigapp::MODE_ANIMATE)
+       {
+               int maxx = drawing_area->get_width()-1;
+               int maxy = drawing_area->get_height()-1;
+
+               if (dx > 0)
+               {
+                       drawing_area->queue_draw_area(      0, 0,       1, maxy);
+                       drawing_area->queue_draw_area(maxx-dx, 0, maxx-dx, maxy);
+               }
+               else if (dx < 0) 
+               {
+                       drawing_area->queue_draw_area(   maxx, 0,    maxx, maxy);
+                       drawing_area->queue_draw_area(    -dx, 0,     -dx, maxy);
+               }
+               if (dy > 0)
+               {
+                       drawing_area->queue_draw_area(0,       0, maxx,       1);
+                       drawing_area->queue_draw_area(0, maxy-dy, maxx, maxy-dy);
+               }
+               else if (dy < 0) 
+               {
+                       drawing_area->queue_draw_area(0,    maxy, maxx,    maxy);
+                       drawing_area->queue_draw_area(0,     -dy, maxx,     -dy);
+               }
+       }
+#endif // USE_FRAME_BACKGROUND_TO_SHOW_EDIT_MODE
+
        last_focus_point=focus_point;
 }
 
@@ -2464,9 +2592,11 @@ studio::WorkArea::zoom_norm()
 gboolean
 studio::WorkArea::__render_preview(gpointer data)
 {
-
        WorkArea *work_area(static_cast<WorkArea*>(data));
 
+       // there's no point anyone trying to cancel the timer now - it's gone off already
+       work_area->render_idle_func_id = 0;
+
        work_area->queued=false;
        work_area->async_render_preview(work_area->get_canvas_view()->get_time());
 
@@ -2489,24 +2619,29 @@ studio::WorkArea::queue_render_preview()
 */
                //async_renderer=0;
        }
-       
+
        if(dirty_trap_enabled)
        {
                dirty_trap_queued++;
                return;
        }
-       
+
        int queue_time=50;
-       
+
        if(rendering)
                queue_time+=250;
-       
+
 
        if(queued==false)
        {
                //synfig::info("queue_render_preview(): (re)queuing...");
                //render_idle_func_id=g_idle_add_full(G_PRIORITY_DEFAULT,__render_preview,this,NULL);
-               render_idle_func_id=g_timeout_add_full(G_PRIORITY_DEFAULT,queue_time,__render_preview,this,NULL);
+               render_idle_func_id=g_timeout_add_full(
+                       G_PRIORITY_DEFAULT,     // priority - 
+                       queue_time,                     // interval - the time between calls to the function, in milliseconds (1/1000ths of a second)
+                       __render_preview,       // function - function to call
+                       this,                           // data     - data to pass to function
+                       NULL);                          // notify   - function to call when the idle is removed, or NULL
                queued=true;
        }
 /*     else if(rendering)
@@ -2521,7 +2656,7 @@ studio::WorkArea::queue_render_preview()
 DirtyTrap::DirtyTrap(WorkArea *work_area):work_area(work_area)
 {
        work_area->dirty_trap_enabled=true;
-       
+
        work_area->dirty_trap_queued=0;
 }
 
@@ -2549,12 +2684,12 @@ studio::WorkArea::set_cursor(Gdk::CursorType x)
        drawing_area->get_window()->set_cursor(Gdk::Cursor(x));
 }
 
-#include "iconcontroler.h"
+#include "iconcontroller.h"
 
 void
 studio::WorkArea::refresh_cursor()
 {
-//     set_cursor(IconControler::get_tool_cursor(canvas_view->get_smach().get_state_name(),drawing_area->get_window()));
+//     set_cursor(IconController::get_tool_cursor(canvas_view->get_smach().get_state_name(),drawing_area->get_window()));
 }
 
 void