--- /dev/null
+/* === S Y N F I G ========================================================= */
+/*! \file layer_pastecanvas.h
+** \brief Header file for implementation of the "Paste Canvas" layer
+**
+** $Id$
+**
+** \legal
+** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
+** 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
+** published by the Free Software Foundation; either version 2 of
+** the License, or (at your option) any later version.
+**
+** This package is distributed in the hope that it will be useful,
+** but WITHOUT ANY WARRANTY; without even the implied warranty of
+** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+** General Public License for more details.
+** \endlegal
+*/
+/* ========================================================================= */
+
+/* === S T A R T =========================================================== */
+
+#ifndef __SYNFIG_LAYER_PASTEIMAGE_H
+#define __SYNFIG_LAYER_PASTEIMAGE_H
+
+/* === H E A D E R S ======================================================= */
+
+#include "layer_composite.h"
+#include "color.h"
+#include "vector.h"
+#include "real.h"
+#include "time.h"
+#include "canvasbase.h"
+#include "canvas.h"
+#include "rect.h"
+
+/* === M A C R O S ========================================================= */
+
+/* === T Y P E D E F S ===================================================== */
+
+/* === C L A S S E S & S T R U C T S ======================================= */
+
+namespace synfig {
+
+class Layer_PasteCanvas : public Layer_Composite, public Layer_NoDeform
+{
+ SYNFIG_LAYER_MODULE_EXT
+private:
+
+ Vector origin;
+ Vector focus;
+
+ etl::loose_handle<synfig::Canvas> canvas;
+
+ //! Recursion depth counter
+ mutable int depth;
+
+ Real zoom;
+
+ Time time_offset;
+
+ mutable Time curr_time;
+
+ bool muck_with_time_;
+
+ bool children_lock;
+
+ mutable Rect bounds;
+
+ sigc::connection child_changed_connection;
+
+ // Nasty hack: Remember whether we called an extra ref() when
+ // setting the canvas, so we know whether to call an extra unref()
+ // when finished with the canvas.
+ //
+ // Here's the story:
+ //
+ // The root canvas is destructed first. That sets the
+ // Layer::canvas_ (the parent canvas) of any PasteCanvas layer it
+ // contains to nil, due to a call to Layer::set_canvas(0),
+ // triggered by the connection made when Layer::set_canvas
+ // originally set its canvas_ member to point to the root canvas.
+ // ~Canvas does begin_delete() which triggers that connection.
+ //
+ // After ~Canvas has run, the members of the root canvas are
+ // freed, including its children_ list. If this was the last
+ // reference to the child canvas that the pastecanvas uses, that
+ // child canvas will Layer_PasteCanvas::set_sub_canvas(0) on the
+ // PasteCanvas layer to set its canvas (the child, pasted canvas)
+ // not to refer to the soon-to-be destroys child canvas. But
+ // set_sub_canvas() originally looked at the value of
+ // Layer::canvas_ (the parent canvas, obtained via
+ // Layer::get_canvas()) to decide whether to do an extra ref() on
+ // canvas (the child canvas). We need to unref() it now if we
+ // did, but we've forgotten whether we did. So we use this
+ // 'extra_reference' member to store that decision.
+ bool extra_reference;
+
+ /*
+ -- ** -- S I G N A L S -------------------------------------------------------
+ */
+
+private:
+
+ sigc::signal<void> signal_subcanvas_changed_;
+
+ /*
+ -- ** -- S I G N A L I N T E R F A C E -------------------------------------
+ */
+
+public:
+
+ sigc::signal<void>& signal_subcanvas_changed() { return signal_subcanvas_changed_; }
+
+public:
+
+ void update_renddesc();
+
+ virtual void on_canvas_set();
+
+ void set_muck_with_time(bool x=false) { muck_with_time_=x; }
+
+ etl::handle<synfig::Canvas> get_sub_canvas()const { return canvas; }
+ void set_sub_canvas(etl::handle<synfig::Canvas> x);
+
+ Real get_zoom()const { return zoom; }
+
+ Time get_time_offset()const { return time_offset; }
+
+ Point get_origin()const { return origin; }
+
+ Layer_PasteCanvas();
+ virtual ~Layer_PasteCanvas();
+
+ virtual String get_local_name()const;
+
+ virtual bool set_param(const String & param, const synfig::ValueBase &value);
+
+ virtual ValueBase get_param(const String & param)const;
+
+ virtual Color get_color(Context context, const Point &pos)const;
+
+ virtual void set_time(Context context, Time time)const;
+
+ virtual bool accelerated_render(Context context,Surface *surface,int quality, const RendDesc &renddesc, ProgressCallback *cb)const;
+
+ virtual Vocab get_param_vocab()const;
+
+ virtual synfig::Rect get_bounding_rect()const;
+
+ virtual synfig::Layer::Handle hit_check(synfig::Context context, const synfig::Point &point)const;
+
+protected:
+ virtual void get_times_vfunc(Node::time_set &set) const;
+
+}; // END of class Layer_PasteCanvas
+
+}; // END of namespace synfig
+
+/* === E N D =============================================================== */
+
+#endif
projects / synfig.git / blobdiff