00001 /* === S Y N F I G ========================================================= */ 00022 /* ========================================================================= */ 00023 00024 /* === S T A R T =========================================================== */ 00025 00026 #ifndef __SYNFIG_LAYER_PASTEIMAGE_H 00027 #define __SYNFIG_LAYER_PASTEIMAGE_H 00028 00029 /* === H E A D E R S ======================================================= */ 00030 00031 #include "layer_composite.h" 00032 #include "color.h" 00033 #include "vector.h" 00034 #include "real.h" 00035 #include "time.h" 00036 #include "canvasbase.h" 00037 #include "canvas.h" 00038 #include "rect.h" 00039 00040 /* === M A C R O S ========================================================= */ 00041 00042 /* === T Y P E D E F S ===================================================== */ 00043 00044 /* === C L A S S E S & S T R U C T S ======================================= */ 00045 00046 namespace synfig { 00047 00048 class Layer_PasteCanvas : public Layer_Composite, public Layer_NoDeform 00049 { 00050 SYNFIG_LAYER_MODULE_EXT 00051 private: 00052 00053 Vector origin; 00054 Vector focus; 00055 00056 etl::loose_handle<synfig::Canvas> canvas; 00057 00059 mutable int depth; 00060 00061 Real zoom; 00062 00063 Time time_offset; 00064 00065 mutable Time curr_time; 00066 00067 bool muck_with_time_; 00068 00069 bool children_lock; 00070 00071 mutable Rect bounds; 00072 00073 sigc::connection child_changed_connection; 00074 00075 // Nasty hack: Remember whether we called an extra ref() when 00076 // setting the canvas, so we know whether to call an extra unref() 00077 // when finished with the canvas. 00078 // 00079 // Here's the story: 00080 // 00081 // The root canvas is destructed first. That sets the 00082 // Layer::canvas_ (the parent canvas) of any PasteCanvas layer it 00083 // contains to nil, due to a call to Layer::set_canvas(0), 00084 // triggered by the connection made when Layer::set_canvas 00085 // originally set its canvas_ member to point to the root canvas. 00086 // ~Canvas does begin_delete() which triggers that connection. 00087 // 00088 // After ~Canvas has run, the members of the root canvas are 00089 // freed, including its children_ list. If this was the last 00090 // reference to the child canvas that the pastecanvas uses, that 00091 // child canvas will Layer_PasteCanvas::set_sub_canvas(0) on the 00092 // PasteCanvas layer to set its canvas (the child, pasted canvas) 00093 // not to refer to the soon-to-be destroys child canvas. But 00094 // set_sub_canvas() originally looked at the value of 00095 // Layer::canvas_ (the parent canvas, obtained via 00096 // Layer::get_canvas()) to decide whether to do an extra ref() on 00097 // canvas (the child canvas). We need to unref() it now if we 00098 // did, but we've forgotten whether we did. So we use this 00099 // 'extra_reference' member to store that decision. 00100 bool extra_reference; 00101 00102 /* 00103 -- ** -- S I G N A L S ------------------------------------------------------- 00104 */ 00105 00106 private: 00107 00108 sigc::signal<void> signal_subcanvas_changed_; 00109 00110 /* 00111 -- ** -- S I G N A L I N T E R F A C E ------------------------------------- 00112 */ 00113 00114 public: 00115 00116 sigc::signal<void>& signal_subcanvas_changed() { return signal_subcanvas_changed_; } 00117 00118 public: 00119 00120 void update_renddesc(); 00121 00122 virtual void on_canvas_set(); 00123 00124 void set_muck_with_time(bool x=false) { muck_with_time_=x; } 00125 00126 etl::handle<synfig::Canvas> get_sub_canvas()const { return canvas; } 00127 void set_sub_canvas(etl::handle<synfig::Canvas> x); 00128 00129 Real get_zoom()const { return zoom; } 00130 00131 Time get_time_offset()const { return time_offset; } 00132 00133 Point get_origin()const { return origin; } 00134 00135 Layer_PasteCanvas(); 00136 virtual ~Layer_PasteCanvas(); 00137 00138 virtual String get_local_name()const; 00139 00140 virtual bool set_param(const String & param, const synfig::ValueBase &value); 00141 00142 virtual ValueBase get_param(const String & param)const; 00143 00144 virtual Color get_color(Context context, const Point &pos)const; 00145 00146 virtual void set_time(Context context, Time time)const; 00147 00148 virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const; 00149 00150 virtual Vocab get_param_vocab()const; 00151 00152 virtual synfig::Rect get_bounding_rect()const; 00153 00154 virtual synfig::Layer::Handle hit_check(synfig::Context context, const synfig::Point &point)const; 00155 00156 protected: 00157 virtual void get_times_vfunc(Node::time_set &set) const; 00158 00159 }; // END of class Layer_PasteCanvas 00160 00161 }; // END of namespace synfig 00162 00163 /* === E N D =============================================================== */ 00164 00165 #endif