src/wx/film_viewer.cc

   1 /*
   2     Copyright (C) 2012 Carl Hetherington <cth@carlh.net>
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17
  18 */
  19
  20 /** @file  src/film_viewer.cc
  21  *  @brief A wx widget to view `thumbnails' of a Film.
  22  */
  23
  24 #include <iostream>
  25 #include <iomanip>
  26 #include "lib/film.h"
  27 #include "lib/format.h"
  28 #include "lib/util.h"
  29 #include "lib/thumbs_job.h"
  30 #include "lib/job_manager.h"
  31 #include "lib/film_state.h"
  32 #include "lib/options.h"
  33 #include "lib/subtitle.h"
  34 #include "film_viewer.h"
  35 #include "wx_util.h"
  36
  37 using namespace std;
  38 using namespace boost;
  39
  40 class ThumbPanel : public wxPanel
  41 {
  42 public:
  43         ThumbPanel (wxPanel* parent, Film* film)
  44                 : wxPanel (parent)
  45                 , _film (film)
  46                 , _frame_rebuild_needed (false)
  47                 , _composition_needed (false)
  48         {}
  49
  50         /** Handle a paint event */
  51         void paint_event (wxPaintEvent& ev)
  52         {
  53                 if (!_film || _film->thumbs().size() == 0) {
  54                         wxPaintDC dc (this);
  55                         return;
  56                 }
  57
  58                 if (_frame_rebuild_needed) {
  59                         _image.reset (new wxImage (std_to_wx (_film->thumb_file (_index))));
  60
  61                         _subtitle.reset ();
  62                         pair<Position, string> s = _film->thumb_subtitle (_index);
  63                         if (!s.second.empty ()) {
  64                                 _subtitle.reset (new SubtitleView (s.first, std_to_wx (s.second)));
  65                         }
  66
  67                         _frame_rebuild_needed = false;
  68                         compose ();
  69                 }
  70
  71                 if (_composition_needed) {
  72                         compose ();
  73                 }
  74
  75                 wxPaintDC dc (this);
  76                 if (_bitmap) {
  77                         dc.DrawBitmap (*_bitmap, 0, 0, false);
  78                 }
  79
  80                 if (_film->with_subtitles() && _subtitle) {
  81                         dc.DrawBitmap (*_subtitle->bitmap, _subtitle->transformed_area.x, _subtitle->transformed_area.y, true);
  82                 }
  83         }
  84
  85         /** Handle a size event */
  86         void size_event (wxSizeEvent &)
  87         {
  88                 if (!_image) {
  89                         return;
  90                 }
  91
  92                 recompose ();
  93         }
  94
  95         /** @param n Thumbnail index */
  96         void set (int n)
  97         {
  98                 _index = n;
  99                 _frame_rebuild_needed = true;
 100                 Refresh ();
 101         }
 102
 103         void set_film (Film* f)
 104         {
 105                 _film = f;
 106                 if (!_film) {
 107                         clear ();
 108                         _frame_rebuild_needed = true;
 109                         Refresh ();
 110                 } else {
 111                         _frame_rebuild_needed = true;
 112                         Refresh ();
 113                 }
 114         }
 115
 116         /** Clear our thumbnail image */
 117         void clear ()
 118         {
 119                 _bitmap.reset ();
 120                 _image.reset ();
 121                 _subtitle.reset ();
 122         }
 123
 124         void recompose ()
 125         {
 126                 _composition_needed = true;
 127                 Refresh ();
 128         }
 129
 130         DECLARE_EVENT_TABLE ();
 131
 132 private:
 133
 134         void compose ()
 135         {
 136                 _composition_needed = false;
 137
 138                 if (!_film || !_image) {
 139                         return;
 140                 }
 141
 142                 /* Size of the view */
 143                 int vw, vh;
 144                 GetSize (&vw, &vh);
 145
 146                 Crop const fc = _film->crop ();
 147
 148                 /* Cropped rectangle */
 149                 Rect cropped_area (
 150                         fc.left,
 151                         fc.top,
 152                         _image->GetWidth() - (fc.left + fc.right),
 153                         _image->GetHeight() - (fc.top + fc.bottom)
 154                         );
 155
 156                 /* Target ratio */
 157                 float const target = _film->format() ? _film->format()->ratio_as_float (_film) : 1.78;
 158
 159                 _transformed_image = _image->GetSubImage (wxRect (cropped_area.x, cropped_area.y, cropped_area.width, cropped_area.height));
 160
 161                 float x_scale = 1;
 162                 float y_scale = 1;
 163
 164                 if ((float (vw) / vh) > target) {
 165                         /* view is longer (horizontally) than the ratio; fit height */
 166                         _transformed_image.Rescale (vh * target, vh, wxIMAGE_QUALITY_HIGH);
 167                         x_scale = vh * target / cropped_area.width;
 168                         y_scale = float (vh) / cropped_area.height;
 169                 } else {
 170                         /* view is shorter (horizontally) than the ratio; fit width */
 171                         _transformed_image.Rescale (vw, vw / target, wxIMAGE_QUALITY_HIGH);
 172                         x_scale = float (vw) / cropped_area.width;
 173                         y_scale = (vw / target) / cropped_area.height;
 174                 }
 175
 176                 _bitmap.reset (new wxBitmap (_transformed_image));
 177
 178                 if (_subtitle) {
 179
 180                         _subtitle->transformed_area = subtitle_transformed_area (
 181                                 x_scale, y_scale, _subtitle->base_area, _film->subtitle_offset(), _film->subtitle_scale()
 182                                 );
 183
 184                         _subtitle->transformed_image = _subtitle->base_image;
 185                         _subtitle->transformed_image.Rescale (_subtitle->transformed_area.width, _subtitle->transformed_area.height, wxIMAGE_QUALITY_HIGH);
 186                         _subtitle->transformed_area.x -= _film->crop().left;
 187                         _subtitle->transformed_area.y -= _film->crop().top;
 188                         _subtitle->bitmap.reset (new wxBitmap (_subtitle->transformed_image));
 189                 }
 190         }
 191
 192         Film* _film;
 193         shared_ptr<wxImage> _image;
 194         wxImage _transformed_image;
 195         /** currently-displayed thumbnail index */
 196         int _index;
 197         shared_ptr<wxBitmap> _bitmap;
 198         bool _frame_rebuild_needed;
 199         bool _composition_needed;
 200
 201         struct SubtitleView
 202         {
 203                 SubtitleView (Position p, wxString const & i)
 204                         : base_image (i)
 205                 {
 206                         base_area.x = p.x;
 207                         base_area.y = p.y;
 208                         base_area.width = base_image.GetWidth ();
 209                         base_area.height = base_image.GetHeight ();
 210                 }
 211
 212                 Rect base_area;
 213                 Rect transformed_area;
 214                 wxImage base_image;
 215                 wxImage transformed_image;
 216                 shared_ptr<wxBitmap> bitmap;
 217         };
 218
 219         shared_ptr<SubtitleView> _subtitle;
 220 };
 221
 222 BEGIN_EVENT_TABLE (ThumbPanel, wxPanel)
 223 EVT_PAINT (ThumbPanel::paint_event)
 224 EVT_SIZE (ThumbPanel::size_event)
 225 END_EVENT_TABLE ()
 226
 227 FilmViewer::FilmViewer (Film* f, wxWindow* p)
 228         : wxPanel (p)
 229         , _film (0)
 230 {
 231         _sizer = new wxBoxSizer (wxVERTICAL);
 232         SetSizer (_sizer);
 233
 234         _thumb_panel = new ThumbPanel (this, f);
 235         _sizer->Add (_thumb_panel, 1, wxEXPAND);
 236
 237         int const m = max (1LU, f ? f->thumbs().size() - 1 : 0);
 238         _slider = new wxSlider (this, wxID_ANY, 0, 0, m);
 239         _sizer->Add (_slider, 0, wxEXPAND | wxLEFT | wxRIGHT);
 240         set_thumbnail (0);
 241
 242         _slider->Connect (wxID_ANY, wxEVT_COMMAND_SLIDER_UPDATED, wxCommandEventHandler (FilmViewer::slider_changed), 0, this);
 243
 244         set_film (_film);
 245 }
 246
 247 void
 248 FilmViewer::set_thumbnail (int n)
 249 {
 250         if (_film == 0 || int (_film->thumbs().size()) <= n) {
 251                 return;
 252         }
 253
 254         _thumb_panel->set (n);
 255 }
 256
 257 void
 258 FilmViewer::slider_changed (wxCommandEvent &)
 259 {
 260         set_thumbnail (_slider->GetValue ());
 261 }
 262
 263 void
 264 FilmViewer::film_changed (FilmState::Property p)
 265 {
 266         switch (p) {
 267         case FilmState::THUMBS:
 268                 if (_film && _film->thumbs().size() > 1) {
 269                         _slider->SetRange (0, _film->thumbs().size() - 1);
 270                 } else {
 271                         _thumb_panel->clear ();
 272                         _slider->SetRange (0, 1);
 273                 }
 274
 275                 _slider->SetValue (0);
 276                 set_thumbnail (0);
 277                 break;
 278         case FilmState::CONTENT:
 279                 setup_visibility ();
 280                 _film->examine_content ();
 281                 update_thumbs ();
 282                 break;
 283         case FilmState::CROP:
 284         case FilmState::FORMAT:
 285         case FilmState::WITH_SUBTITLES:
 286         case FilmState::SUBTITLE_OFFSET:
 287         case FilmState::SUBTITLE_SCALE:
 288                 _thumb_panel->recompose ();
 289                 break;
 290         default:
 291                 break;
 292         }
 293 }
 294
 295 void
 296 FilmViewer::set_film (Film* f)
 297 {
 298         if (_film == f) {
 299                 return;
 300         }
 301
 302         _film = f;
 303         _thumb_panel->set_film (_film);
 304
 305         if (!_film) {
 306                 return;
 307         }
 308
 309         _film->Changed.connect (sigc::mem_fun (*this, &FilmViewer::film_changed));
 310         film_changed (Film::CROP);
 311         film_changed (Film::THUMBS);
 312         setup_visibility ();
 313 }
 314
 315 void
 316 FilmViewer::update_thumbs ()
 317 {
 318         if (!_film) {
 319                 return;
 320         }
 321
 322         _film->update_thumbs_pre_gui ();
 323
 324         shared_ptr<const FilmState> s = _film->state_copy ();
 325         shared_ptr<Options> o (new Options (s->dir ("thumbs"), ".png", ""));
 326         o->out_size = _film->size ();
 327         o->apply_crop = false;
 328         o->decode_audio = false;
 329         o->decode_video_frequency = 128;
 330         o->decode_subtitles = true;
 331
 332         shared_ptr<Job> j (new ThumbsJob (s, o, _film->log(), shared_ptr<Job> ()));
 333         j->Finished.connect (sigc::mem_fun (_film, &Film::update_thumbs_post_gui));
 334         JobManager::instance()->add (j);
 335 }
 336
 337 void
 338 FilmViewer::setup_visibility ()
 339 {
 340         if (!_film) {
 341                 return;
 342         }
 343
 344         ContentType const c = _film->content_type ();
 345         _slider->Show (c == VIDEO);
 346 }