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/*
Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
This program 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 program 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/** @file src/film_viewer.h
* @brief A wx widget to view `thumbnails' of a Film.
*/
#include <wx/wx.h>
#include "lib/film.h"
class wxToggleButton;
class FFmpegPlayer;
class Image;
class RGBPlusAlphaImage;
class Subtitle;
/** @class FilmViewer
* @brief A wx widget to view a preview of a Film.
*
* The film takes the following path through the viewer:
*
* 1. get_frame() asks our _player to decode some data. If it does, process_video()
* will be called.
*
* 2. process_video() takes the image and subtitle from the decoder (_raw_frame and _raw_sub)
* and calls raw_to_display().
*
* 3. raw_to_display() copies _raw_frame to _display_frame, processing it and scaling it.
*
* 4. calling _panel->Refresh() and _panel->Update() results in paint_panel() being called;
* this creates frame_bitmap from _display_frame and blits it to the display. It also
* blits the subtitle, if required.
*
* update_from_decoder() asks the player to re-emit its current frame on the next pass(), and then
* starts from step #1.
*
* update_from_raw() starts at step #3, then calls _panel->Refresh and _panel->Update.
*/
class FilmViewer : public wxPanel
{
public:
FilmViewer (boost::shared_ptr<Film>, wxWindow *);
void set_film (boost::shared_ptr<Film>);
private:
void film_changed (Film::Property);
void film_content_changed (boost::weak_ptr<Content>, int);
void paint_panel (wxPaintEvent &);
void panel_sized (wxSizeEvent &);
void slider_moved (wxScrollEvent &);
void play_clicked (wxCommandEvent &);
void timer (wxTimerEvent &);
void process_video (boost::shared_ptr<const Image>, bool, boost::shared_ptr<Subtitle>, Time);
void calculate_sizes ();
void check_play_state ();
void update_from_raw ();
void update_from_decoder ();
void raw_to_display ();
void get_frame ();
void active_jobs_changed (bool);
void back_clicked (wxCommandEvent &);
void forward_clicked (wxCommandEvent &);
boost::shared_ptr<Film> _film;
boost::shared_ptr<Player> _player;
wxSizer* _v_sizer;
wxPanel* _panel;
wxSlider* _slider;
wxButton* _back_button;
wxButton* _forward_button;
wxStaticText* _frame;
wxStaticText* _timecode;
wxToggleButton* _play_button;
wxTimer _timer;
boost::shared_ptr<const Image> _raw_frame;
boost::shared_ptr<Subtitle> _raw_sub;
boost::shared_ptr<const Image> _display_frame;
/* The x offset at which we display the actual film content; this corresponds
to the film's padding converted to our coordinates.
*/
int _display_frame_x;
boost::shared_ptr<RGBPlusAlphaImage> _display_sub;
Position _display_sub_position;
bool _got_frame;
/** Size of our output (including padding if we have any) */
libdcp::Size _out_size;
/** Size that we will make our film (equal to _out_size unless we have padding) */
libdcp::Size _film_size;
/** Size of the panel that we have available */
libdcp::Size _panel_size;
};
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