webdvd.cpp

   1 // Copyright 2005-6 Ben Hutchings <ben@decadentplace.org.uk>.
   2 // See the file "COPYING" for licence details.
   3
   4 #include <cassert>
   5 #include <cstring>
   6 #include <exception>
   7 #include <fstream>
   8 #include <iomanip>
   9 #include <iostream>
  10 #include <memory>
  11 #include <queue>
  12 #include <set>
  13 #include <sstream>
  14 #include <string>
  15
  16 #include <stdlib.h>
  17
  18 #include <boost/shared_ptr.hpp>
  19
  20 #include <gdkmm/pixbuf.h>
  21 #include <glibmm/convert.h>
  22 #include <glibmm/spawn.h>
  23 #include <gtkmm/main.h>
  24 #include <gtkmm/window.h>
  25
  26 #include <imglib2/ImageErrors.h>
  27 #include <nsGUIEvent.h>
  28 #include <nsIBoxObject.h>
  29 #include <nsIContent.h>
  30 #include <nsIDocShell.h>
  31 #include <nsIDOMAbstractView.h>
  32 #include <nsIDOMBarProp.h>
  33 #include <nsIDOMDocumentEvent.h>
  34 #include <nsIDOMDocumentView.h>
  35 #include <nsIDOMElement.h>
  36 #include <nsIDOMEventTarget.h>
  37 #include <nsIDOMHTMLDocument.h>
  38 #include <nsIDOMMouseEvent.h>
  39 #include <nsIDOMNSDocument.h>
  40 #include <nsIDOMWindow.h>
  41 #include <nsIEventStateManager.h>
  42 #include <nsIInterfaceRequestorUtils.h>
  43 #include <nsIURI.h> // required before nsILink.h
  44 #include <nsILink.h>
  45 #include <nsIPrefBranch.h>
  46 #include <nsIPrefService.h>
  47 #include <nsIPresContext.h>
  48 #include <nsIPresShell.h>
  49 #include <nsIServiceManagerUtils.h>
  50 #include <nsIWebBrowser.h>
  51 #include <nsString.h>
  52
  53 #include "browser_widget.hpp"
  54 #include "child_iterator.hpp"
  55 #include "dvd.hpp"
  56 #include "generate_dvd.hpp"
  57 #include "link_iterator.hpp"
  58 #include "null_prompt_service.hpp"
  59 #include "pixbufs.hpp"
  60 #include "style_sheets.hpp"
  61 #include "temp_file.hpp"
  62 #include "video.hpp"
  63 #include "x_frame_buffer.hpp"
  64 #include "xml_utils.hpp"
  65 #include "xpcom_support.hpp"
  66
  67 using xpcom_support::check;
  68
  69 namespace
  70 {
  71     // We can try using any of these encoders to convert PNG to MPEG.
  72     enum mpeg_encoder
  73     {
  74         mpeg_encoder_ffmpeg,         // ffmpeg - doesn't work yet
  75         mpeg_encoder_mjpegtools_old, // mjpegtools before version 1.8
  76         mpeg_encoder_mjpegtools_new  // mjpegtools from version 1.8
  77     };
  78
  79     struct rectangle
  80     {
  81         int left, top;     // inclusive
  82         int right, bottom; // exclusive
  83
  84         rectangle operator|=(const rectangle & other)
  85             {
  86                 if (other.empty())
  87                 {
  88                     // use current extents unchanged
  89                 }
  90                 else if (empty())
  91                 {
  92                     // use other extents
  93                     *this = other;
  94                 }
  95                 else
  96                 {
  97                     // find rectangle enclosing both extents
  98                     left = std::min(left, other.left);
  99                     top = std::min(top, other.top);
 100                     right = std::max(right, other.right);
 101                     bottom = std::max(bottom, other.bottom);
 102                 }
 103
 104                 return *this;
 105             }
 106
 107         rectangle operator&=(const rectangle & other)
 108             {
 109                 // find rectangle enclosed in both extents
 110                 left = std::max(left, other.left);
 111                 top = std::max(top, other.top);
 112                 right = std::max(left, std::min(right, other.right));
 113                 bottom = std::max(top, std::min(bottom, other.bottom));
 114                 return *this;
 115             }
 116
 117         bool empty() const
 118             {
 119                 return left == right || bottom == top;
 120             }
 121     };
 122
 123     rectangle get_elem_rect(nsIDOMNSDocument * ns_doc,
 124                             nsIDOMElement * elem)
 125     {
 126         rectangle result;
 127
 128         // Start with this element's bounding box
 129         nsCOMPtr<nsIBoxObject> box;
 130         check(ns_doc->GetBoxObjectFor(elem, getter_AddRefs(box)));
 131         int width, height;
 132         check(box->GetScreenX(&result.left));
 133         check(box->GetScreenY(&result.top));
 134         check(box->GetWidth(&width));
 135         check(box->GetHeight(&height));
 136         result.right = result.left + width;
 137         result.bottom = result.top + height;
 138
 139         // Merge bounding boxes of all child elements
 140         for (child_iterator it = child_iterator(elem), end; it != end; ++it)
 141         {
 142             nsCOMPtr<nsIDOMNode> child_node(*it);
 143             PRUint16 child_type;
 144             if (check(child_node->GetNodeType(&child_type)),
 145                 child_type == nsIDOMNode::ELEMENT_NODE)
 146             {
 147                 nsCOMPtr<nsIDOMElement> child_elem(
 148                     do_QueryInterface(child_node));
 149                 result |= get_elem_rect(ns_doc, child_elem);
 150             }
 151         }
 152
 153         return result;
 154     }
 155
 156
 157     class webdvd_window : public Gtk::Window
 158     {
 159     public:
 160         webdvd_window(
 161             const video::frame_params & frame_params,
 162             const std::string & main_page_uri,
 163             const std::string & output_dir,
 164             mpeg_encoder encoder);
 165
 166         bool is_finished() const;
 167
 168     private:
 169         dvd_contents::pgc_ref add_menu(const std::string & uri);
 170         dvd_contents::pgc_ref add_title(const std::string & uri);
 171         void load_next_page();
 172         void on_net_state_change(const char * uri, gint flags, guint status);
 173         bool browser_is_busy() const
 174             {
 175                 return pending_window_update_ || pending_req_count_;
 176             }
 177         bool process_page();
 178         void save_screenshot();
 179         void process_links(nsIPresShell * pres_shell,
 180                            nsIPresContext * pres_context,
 181                            nsIDOMWindow * dom_window);
 182
 183         video::frame_params frame_params_;
 184         std::string output_dir_;
 185         mpeg_encoder encoder_;
 186         browser_widget browser_widget_;
 187         nsCOMPtr<nsIStyleSheet> stylesheet_;
 188
 189         dvd_contents contents_;
 190         typedef std::map<std::string, dvd_contents::pgc_ref> resource_map_type;
 191         resource_map_type resource_map_;
 192
 193         std::queue<std::string> page_queue_;
 194         bool pending_window_update_;
 195         int pending_req_count_;
 196         bool have_tweaked_page_;
 197         std::auto_ptr<temp_file> background_temp_;
 198         struct page_state;
 199         std::auto_ptr<page_state> page_state_;
 200
 201         bool finished_;
 202     };
 203
 204     webdvd_window::webdvd_window(
 205         const video::frame_params & frame_params,
 206         const std::string & main_page_uri,
 207         const std::string & output_dir,
 208         mpeg_encoder encoder)
 209             : frame_params_(frame_params),
 210               output_dir_(output_dir),
 211               encoder_(encoder),
 212               stylesheet_(load_css("file://" WEBDVD_LIB_DIR "/webdvd.css")),
 213               pending_window_update_(false),
 214               pending_req_count_(0),
 215               have_tweaked_page_(false),
 216               finished_(false)
 217     {
 218         set_size_request(frame_params_.width, frame_params_.height);
 219         set_resizable(false);
 220
 221         add(browser_widget_);
 222         browser_widget_.show();
 223         browser_widget_.signal_net_state().connect(
 224             SigC::slot(*this, &webdvd_window::on_net_state_change));
 225
 226         add_menu(main_page_uri);
 227         load_next_page();
 228     }
 229
 230     bool webdvd_window::is_finished() const
 231     {
 232         return finished_;
 233     }
 234
 235     dvd_contents::pgc_ref webdvd_window::add_menu(const std::string & uri)
 236     {
 237         dvd_contents::pgc_ref next_menu(dvd_contents::menu_pgc,
 238                                         contents_.menus.size());
 239         std::pair<resource_map_type::iterator, bool> insert_result(
 240             resource_map_.insert(std::make_pair(uri, next_menu)));
 241
 242         if (!insert_result.second)
 243         {
 244             return insert_result.first->second;
 245         }
 246         else
 247         {
 248             page_queue_.push(uri);
 249             contents_.menus.resize(contents_.menus.size() + 1);
 250             return next_menu;
 251         }
 252     }
 253
 254     dvd_contents::pgc_ref webdvd_window::add_title(const std::string & uri)
 255     {
 256         dvd_contents::pgc_ref next_title(dvd_contents::title_pgc,
 257                                          contents_.titles.size());
 258         std::pair<resource_map_type::iterator, bool> insert_result(
 259             resource_map_.insert(std::make_pair(uri, next_title)));
 260
 261         if (!insert_result.second)
 262         {
 263             return insert_result.first->second;
 264         }
 265         else
 266         {
 267             Glib::ustring hostname;
 268             std::string path(Glib::filename_from_uri(uri, hostname));
 269             // FIXME: Should check the hostname
 270
 271             vob_list list;
 272
 273             // Store a reference to a linked VOB file, or the contents
 274             // of a linked VOB list file.
 275             if (path.compare(path.size() - 4, 4, ".vob") == 0)
 276             {
 277                 if (!Glib::file_test(path, Glib::FILE_TEST_IS_REGULAR))
 278                     throw std::runtime_error(
 279                         path + " is missing or not a regular file");
 280                 vob_ref ref;
 281                 ref.file = path;
 282                 list.push_back(ref);
 283             }
 284             else
 285             {
 286                 assert(path.compare(path.size() - 8, 8, ".voblist") == 0);
 287                 read_vob_list(path).swap(list);
 288             }
 289
 290             contents_.titles.resize(contents_.titles.size() + 1);
 291             contents_.titles.back().swap(list);
 292             return next_title;
 293         }
 294     }
 295
 296     void webdvd_window::load_next_page()
 297     {
 298         assert(!page_queue_.empty());
 299         const std::string & uri = page_queue_.front();
 300         std::cout << "loading " << uri << std::endl;
 301
 302         browser_widget_.load_uri(uri);
 303     }
 304
 305     void webdvd_window::on_net_state_change(const char * uri,
 306                                            gint flags, guint status)
 307     {
 308 #       ifdef DEBUG_ON_NET_STATE_CHANGE
 309         std::cout << "webdvd_window::on_net_state_change(";
 310         if (uri)
 311             std::cout << '"' << uri << '"';
 312         else
 313             std::cout << "NULL";
 314         std::cout << ", ";
 315         {
 316             gint flags_left = flags;
 317             static const struct {
 318                 gint value;
 319                 const char * name;
 320             } flag_names[] = {
 321                 { GTK_MOZ_EMBED_FLAG_START, "STATE_START" },
 322                 { GTK_MOZ_EMBED_FLAG_REDIRECTING, "STATE_REDIRECTING" },
 323                 { GTK_MOZ_EMBED_FLAG_TRANSFERRING, "STATE_TRANSFERRING" },
 324                 { GTK_MOZ_EMBED_FLAG_NEGOTIATING, "STATE_NEGOTIATING" },
 325                 { GTK_MOZ_EMBED_FLAG_STOP, "STATE_STOP" },
 326                 { GTK_MOZ_EMBED_FLAG_IS_REQUEST, "STATE_IS_REQUEST" },
 327                 { GTK_MOZ_EMBED_FLAG_IS_DOCUMENT, "STATE_IS_DOCUMENT" },
 328                 { GTK_MOZ_EMBED_FLAG_IS_NETWORK, "STATE_IS_NETWORK" },
 329                 { GTK_MOZ_EMBED_FLAG_IS_WINDOW, "STATE_IS_WINDOW" }
 330             };
 331             for (int i = 0; i != sizeof(flag_names)/sizeof(flag_names[0]); ++i)
 332             {
 333                 if (flags & flag_names[i].value)
 334                 {
 335                     std::cout << flag_names[i].name;
 336                     flags_left -= flag_names[i].value;
 337                     if (flags_left)
 338                         std::cout << " | ";
 339                 }
 340             }
 341             if (flags_left)
 342                 std::cout << "0x" << std::setbase(16) << flags_left;
 343         }
 344         std::cout << ", " << "0x" << std::setbase(16) << status << ")\n";
 345 #       endif // DEBUG_ON_NET_STATE_CHANGE
 346
 347         if (flags & GTK_MOZ_EMBED_FLAG_IS_REQUEST)
 348         {
 349             if (flags & GTK_MOZ_EMBED_FLAG_START)
 350                 ++pending_req_count_;
 351
 352             if (flags & GTK_MOZ_EMBED_FLAG_STOP)
 353             {
 354                 assert(pending_req_count_ != 0);
 355                 --pending_req_count_;
 356             }
 357         }
 358
 359         if (flags & GTK_MOZ_EMBED_FLAG_IS_DOCUMENT
 360             && flags & GTK_MOZ_EMBED_FLAG_START)
 361         {
 362             pending_window_update_ = true;
 363             have_tweaked_page_ = false;
 364         }
 365
 366         if (flags & GTK_MOZ_EMBED_FLAG_IS_WINDOW
 367             && flags & GTK_MOZ_EMBED_FLAG_STOP)
 368         {
 369             // Check whether the load was successful, ignoring this
 370             // pseudo-error.
 371             if (status != NS_IMAGELIB_ERROR_LOAD_ABORTED)
 372                 check(status);
 373
 374             pending_window_update_ = false;
 375         }
 376
 377         if (!browser_is_busy())
 378         {
 379             try
 380             {
 381                 if (!process_page())
 382                 {
 383                     finished_ = true;
 384                     Gtk::Main::quit();
 385                 }
 386             }
 387             catch (std::exception & e)
 388             {
 389                 std::cerr << "Fatal error";
 390                 if (!page_queue_.empty())
 391                     std::cerr << " while processing <" << page_queue_.front()
 392                               << ">";
 393                 std::cerr << ": " << e.what() << "\n";
 394                 Gtk::Main::quit();
 395             }
 396             catch (Glib::Exception & e)
 397             {
 398                 std::cerr << "Fatal error";
 399                 if (!page_queue_.empty())
 400                     std::cerr << " while processing <" << page_queue_.front()
 401                               << ">";
 402                 std::cerr << ": " << e.what() << "\n";
 403                 Gtk::Main::quit();
 404             }
 405         }
 406     }
 407
 408     bool webdvd_window::process_page()
 409     {
 410         assert(!page_queue_.empty());
 411
 412         nsCOMPtr<nsIWebBrowser> browser(browser_widget_.get_browser());
 413         nsCOMPtr<nsIDocShell> doc_shell(do_GetInterface(browser));
 414         assert(doc_shell);
 415         nsCOMPtr<nsIPresShell> pres_shell;
 416         check(doc_shell->GetPresShell(getter_AddRefs(pres_shell)));
 417         nsCOMPtr<nsIPresContext> pres_context;
 418         check(doc_shell->GetPresContext(getter_AddRefs(pres_context)));
 419         nsCOMPtr<nsIDOMWindow> dom_window;
 420         check(browser->GetContentDOMWindow(getter_AddRefs(dom_window)));
 421
 422         // If we haven't done so already, apply the stylesheet and
 423         // disable scrollbars.
 424         if (!have_tweaked_page_)
 425         {
 426             apply_style_sheet(stylesheet_, pres_shell);
 427
 428             // This actually only needs to be done once.
 429             nsCOMPtr<nsIDOMBarProp> dom_bar_prop;
 430             check(dom_window->GetScrollbars(getter_AddRefs(dom_bar_prop)));
 431             check(dom_bar_prop->SetVisible(false));
 432
 433             have_tweaked_page_ = true;
 434
 435             // Might need to wait a while for things to load or more
 436             // likely for a re-layout.
 437             if (browser_is_busy())
 438                 return true;
 439         }
 440
 441         // All further work should only be done if we're not in preview mode.
 442         if (!output_dir_.empty())
 443         {
 444             // If we haven't already started work on this menu, save a
 445             // screenshot of its normal appearance.
 446             if (!page_state_.get())
 447                 save_screenshot();
 448
 449             // Start or continue processing links.
 450             process_links(pres_shell, pres_context, dom_window);
 451
 452             // If we've finished work on the links, move on to the
 453             // next page, if any, or else generate the DVD filesystem.
 454             if (!page_state_.get())
 455             {
 456                 page_queue_.pop();
 457                 if (page_queue_.empty())
 458                 {
 459                     generate_dvd(contents_, output_dir_);
 460                     return false;
 461                 }
 462                 else
 463                 {
 464                     load_next_page();
 465                 }
 466             }
 467         }
 468
 469         return true;
 470     }
 471
 472     void webdvd_window::save_screenshot()
 473     {
 474         Glib::RefPtr<Gdk::Window> window(get_window());
 475         assert(window);
 476         window->process_updates(true);
 477
 478         background_temp_.reset(new temp_file("webdvd-back-"));
 479         background_temp_->close();
 480         std::cout << "saving " << background_temp_->get_name() << std::endl;
 481         Gdk::Pixbuf::create(Glib::RefPtr<Gdk::Drawable>(window),
 482                             window->get_colormap(),
 483                             0, 0, 0, 0,
 484                             frame_params_.width, frame_params_.height)
 485             ->save(background_temp_->get_name(), "png");
 486     }
 487
 488     struct webdvd_window::page_state
 489     {
 490         page_state(nsIDOMDocument * doc, int width, int height)
 491                 : diff_pixbuf(Gdk::Pixbuf::create(
 492                                   Gdk::COLORSPACE_RGB,
 493                                   true, 8, // has_alpha, bits_per_sample
 494                                   width, height)),
 495                   spumux_temp("webdvd-spumux-"),
 496                   links_temp("webdvd-links-"),
 497                   link_num(0),
 498                   links_it(doc),
 499                   link_changing(false)
 500             {
 501                 spumux_temp.close();
 502                 links_temp.close();
 503             }
 504
 505         Glib::RefPtr<Gdk::Pixbuf> diff_pixbuf;
 506
 507         temp_file spumux_temp;
 508         std::ofstream spumux_file;
 509
 510         temp_file links_temp;
 511
 512         unsigned link_num;
 513         link_iterator links_it, links_end;
 514
 515         rectangle link_rect;
 516         bool link_changing;
 517         Glib::RefPtr<Gdk::Pixbuf> norm_pixbuf;
 518     };
 519
 520     void webdvd_window::process_links(nsIPresShell * pres_shell,
 521                                      nsIPresContext * pres_context,
 522                                      nsIDOMWindow * dom_window)
 523     {
 524         Glib::RefPtr<Gdk::Window> window(get_window());
 525         assert(window);
 526
 527         nsCOMPtr<nsIDOMDocument> basic_doc;
 528         check(dom_window->GetDocument(getter_AddRefs(basic_doc)));
 529         nsCOMPtr<nsIDOMNSDocument> ns_doc(do_QueryInterface(basic_doc));
 530         assert(ns_doc);
 531         nsCOMPtr<nsIEventStateManager> event_state_man(
 532             pres_context->EventStateManager()); // does not AddRef
 533         assert(event_state_man);
 534         nsCOMPtr<nsIDOMDocumentEvent> event_factory(
 535             do_QueryInterface(basic_doc));
 536         assert(event_factory);
 537         nsCOMPtr<nsIDOMDocumentView> doc_view(do_QueryInterface(basic_doc));
 538         assert(doc_view);
 539         nsCOMPtr<nsIDOMAbstractView> view;
 540         check(doc_view->GetDefaultView(getter_AddRefs(view)));
 541
 542         // Set up or recover our iteration state.
 543         std::auto_ptr<page_state> state(page_state_);
 544         if (!state.get())
 545         {
 546             state.reset(
 547                 new page_state(
 548                     basic_doc, frame_params_.width, frame_params_.height));
 549
 550             state->spumux_file.open(state->spumux_temp.get_name().c_str());
 551             state->spumux_file <<
 552                 "<subpictures>\n"
 553                 "  <stream>\n"
 554                 "    <spu force='yes' start='00:00:00.00'\n"
 555                 "        highlight='" << state->links_temp.get_name() << "'\n"
 556                 "        select='" << state->links_temp.get_name() << "'>\n";
 557         }
 558
 559         rectangle window_rect = {
 560             0, 0, frame_params_.width, frame_params_.height
 561         };
 562
 563         unsigned menu_num = resource_map_[page_queue_.front()].index;
 564
 565         for (/* no initialisation */;
 566              state->links_it != state->links_end;
 567              ++state->links_it)
 568         {
 569             nsCOMPtr<nsIDOMNode> node(*state->links_it);
 570
 571             // Find the link URI and separate any fragment from it.
 572             nsCOMPtr<nsILink> link(do_QueryInterface(node));
 573             assert(link);
 574             nsCOMPtr<nsIURI> uri_iface;
 575             check(link->GetHrefURI(getter_AddRefs(uri_iface)));
 576             std::string uri_and_fragment, uri, fragment;
 577             {
 578                 nsCString uri_and_fragment_ns;
 579                 check(uri_iface->GetSpec(uri_and_fragment_ns));
 580                 uri_and_fragment.assign(uri_and_fragment_ns.BeginReading(),
 581                                         uri_and_fragment_ns.EndReading());
 582
 583                 std::size_t hash_pos = uri_and_fragment.find('#');
 584                 uri.assign(uri_and_fragment, 0, hash_pos);
 585                 if (hash_pos != std::string::npos)
 586                     fragment.assign(uri_and_fragment,
 587                                     hash_pos + 1, std::string::npos);
 588             }
 589
 590             // Is this a new link?
 591             if (!state->link_changing)
 592             {
 593                 // Find a rectangle enclosing the link and clip it to the
 594                 // window.
 595                 nsCOMPtr<nsIDOMElement> elem(do_QueryInterface(node));
 596                 assert(elem);
 597                 state->link_rect = get_elem_rect(ns_doc, elem);
 598                 state->link_rect &= window_rect;
 599
 600                 if (state->link_rect.empty())
 601                 {
 602                     std::cerr << "Ignoring invisible link to "
 603                               << uri_and_fragment << "\n";
 604                     continue;
 605                 }
 606
 607                 ++state->link_num;
 608
 609                 if (state->link_num >= unsigned(dvd::menu_buttons_max))
 610                 {
 611                     if (state->link_num == unsigned(dvd::menu_buttons_max))
 612                         std::cerr << "No more than " << dvd::menu_buttons_max
 613                                   << " buttons can be placed on a menu\n";
 614                     std::cerr << "Ignoring link to " << uri_and_fragment
 615                               << "\n";
 616                     continue;
 617                 }
 618
 619                 state->spumux_file <<
 620                     "      <button x0='" << state->link_rect.left << "'"
 621                     " y0='" << state->link_rect.top << "'"
 622                     " x1='" << state->link_rect.right - 1 << "'"
 623                     " y1='" << state->link_rect.bottom - 1 << "'/>\n";
 624
 625                 // Check whether this is a link to a video or a page then
 626                 // add it to the known resources if not already seen; then
 627                 // add it to the menu entries.
 628                 dvd_contents::pgc_ref target;
 629                 // FIXME: This is a bit of a hack.  Perhaps we could decide
 630                 // later based on the MIME type determined by Mozilla?
 631                 if ((uri.size() > 4
 632                      && uri.compare(uri.size() - 4, 4, ".vob") == 0)
 633                     || (uri.size() > 8
 634                         && uri.compare(uri.size() - 8, 8, ".voblist") == 0))
 635                 {
 636                     PRBool is_file;
 637                     check(uri_iface->SchemeIs("file", &is_file));
 638                     if (!is_file)
 639                     {
 640                         std::cerr << "Links to video must use the file:"
 641                                   << " scheme\n";
 642                         continue;
 643                     }
 644                     target = add_title(uri);
 645                     target.sub_index =
 646                         std::strtoul(fragment.c_str(), NULL, 10);
 647                 }
 648                 else
 649                 {
 650                     target = add_menu(uri);
 651                     // TODO: If there's a fragment, work out which button
 652                     // is closest and set target.sub_index.
 653                 }
 654                 contents_.menus[menu_num].entries.push_back(target);
 655
 656                 nsCOMPtr<nsIContent> content(do_QueryInterface(node));
 657                 assert(content);
 658                 nsCOMPtr<nsIDOMEventTarget> event_target(
 659                     do_QueryInterface(node));
 660                 assert(event_target);
 661
 662                 state->norm_pixbuf = Gdk::Pixbuf::create(
 663                     Glib::RefPtr<Gdk::Drawable>(window),
 664                     window->get_colormap(),
 665                     state->link_rect.left,
 666                     state->link_rect.top,
 667                     0,
 668                     0,
 669                     state->link_rect.right - state->link_rect.left,
 670                     state->link_rect.bottom - state->link_rect.top);
 671
 672                 nsCOMPtr<nsIDOMEvent> event;
 673                 check(event_factory->CreateEvent(
 674                           NS_ConvertASCIItoUTF16("MouseEvents"),
 675                           getter_AddRefs(event)));
 676                 nsCOMPtr<nsIDOMMouseEvent> mouse_event(
 677                     do_QueryInterface(event));
 678                 assert(mouse_event);
 679                 check(mouse_event->InitMouseEvent(
 680                           NS_ConvertASCIItoUTF16("mouseover"),
 681                           true,  // can bubble
 682                           true,  // cancelable
 683                           view,
 684                           0,     // detail: mouse click count
 685                           state->link_rect.left, // screenX
 686                           state->link_rect.top,  // screenY
 687                           state->link_rect.left, // clientX
 688                           state->link_rect.top,  // clientY
 689                           false, false, false, false, // qualifiers
 690                           0,     // button: left (or primary)
 691                           0));   // related target
 692                 PRBool dummy;
 693                 check(event_target->DispatchEvent(mouse_event,
 694                                                   &dummy));
 695                 check(event_state_man->SetContentState(content,
 696                                                        NS_EVENT_STATE_HOVER));
 697
 698                 pres_shell->FlushPendingNotifications(true);
 699
 700                 // We may have to exit and wait for image loading
 701                 // to complete, at which point we will be called
 702                 // again.
 703                 if (browser_is_busy())
 704                 {
 705                     state->link_changing = true;
 706                     page_state_ = state;
 707                     return;
 708                 }
 709             }
 710
 711             window->process_updates(true);
 712
 713             Glib::RefPtr<Gdk::Pixbuf> changed_pixbuf(
 714                 Gdk::Pixbuf::create(
 715                     Glib::RefPtr<Gdk::Drawable>(window),
 716                     window->get_colormap(),
 717                     state->link_rect.left,
 718                     state->link_rect.top,
 719                     0,
 720                     0,
 721                     state->link_rect.right - state->link_rect.left,
 722                     state->link_rect.bottom - state->link_rect.top));
 723             diff_rgb_pixbufs(
 724                 state->norm_pixbuf,
 725                 changed_pixbuf,
 726                 state->diff_pixbuf,
 727                 state->link_rect.left,
 728                 state->link_rect.top,
 729                 state->link_rect.right - state->link_rect.left,
 730                 state->link_rect.bottom - state->link_rect.top);
 731         }
 732
 733         quantise_rgba_pixbuf(state->diff_pixbuf, dvd::button_n_colours);
 734
 735         std::cout << "saving " << state->links_temp.get_name()
 736                   << std::endl;
 737         state->diff_pixbuf->save(state->links_temp.get_name(), "png");
 738
 739         state->spumux_file <<
 740             "    </spu>\n"
 741             "  </stream>\n"
 742             "</subpictures>\n";
 743
 744         state->spumux_file.close();
 745
 746         // TODO: if (!state->spumux_file) throw ...
 747
 748         {
 749             std::ostringstream command_stream;
 750             if (encoder_ == mpeg_encoder_ffmpeg)
 751             {
 752                 command_stream
 753                     << "ffmpeg"
 754                     << " -f image2 -vcodec png -i "
 755                     << background_temp_->get_name()
 756                     << " -target " << frame_params_.name <<  "-dvd"
 757                     << " -vcodec mpeg2video -an -y /dev/stdout"
 758                     << " | spumux -v0 -mdvd " << state->spumux_temp.get_name()
 759                     << " > " << contents_.menus[menu_num].vob_temp->get_name();
 760             }
 761             else
 762             {
 763                 assert(encoder_ == mpeg_encoder_mjpegtools_old
 764                        || encoder_ == mpeg_encoder_mjpegtools_new);
 765                 command_stream
 766                     << "pngtopnm "
 767                     << background_temp_->get_name()
 768                     << " | ppmtoy4m -v0 -n1 -F"
 769                     << frame_params_.rate_numer
 770                     << ":" << frame_params_.rate_denom
 771                     << " -A" << frame_params_.pixel_ratio_width
 772                     << ":" << frame_params_.pixel_ratio_height
 773                     << " -Ip ";
 774                 // The chroma subsampling keywords changed between
 775                 // versions 1.6.2 and 1.8 of mjpegtools.  There is no
 776                 // keyword that works with both.
 777                 if (encoder_ == mpeg_encoder_mjpegtools_old)
 778                     command_stream << "-S420_mpeg2";
 779                 else
 780                     command_stream << "-S420mpeg2";
 781                 command_stream
 782                     << (" | mpeg2enc -v0 -f8 -a2 -o/dev/stdout"
 783                         " | mplex -v0 -f8 -o/dev/stdout /dev/stdin"
 784                         " | spumux -v0 -mdvd ")
 785                     << state->spumux_temp.get_name()
 786                     << " > "
 787                     << contents_.menus[menu_num].vob_temp->get_name();
 788             }
 789             std::string command(command_stream.str());
 790             const char * argv[] = {
 791                 "/bin/sh", "-c", command.c_str(), 0
 792             };
 793             std::cout << "running " << argv[2] << std::endl;
 794             int command_result;
 795             Glib::spawn_sync(".",
 796                              Glib::ArrayHandle<std::string>(
 797                                  argv, sizeof(argv)/sizeof(argv[0]),
 798                                  Glib::OWNERSHIP_NONE),
 799                              Glib::SPAWN_STDOUT_TO_DEV_NULL,
 800                              SigC::Slot0<void>(),
 801                              0, 0,
 802                              &command_result);
 803             if (command_result != 0)
 804                 throw std::runtime_error("spumux pipeline failed");
 805         }
 806     }
 807
 808     const video::frame_params & lookup_frame_params(const char * str)
 809     {
 810         assert(str);
 811         static const struct { const char * str; bool is_ntsc; }
 812         known_strings[] = {
 813             { "NTSC",  true },
 814             { "ntsc",  true },
 815             { "PAL",   false },
 816             { "pal",   false },
 817             // For DVD purposes, SECAM can be treated identically to PAL.
 818             { "SECAM", false },
 819             { "secam", false }
 820         };
 821         for (std::size_t i = 0;
 822              i != sizeof(known_strings)/sizeof(known_strings[0]);
 823              ++i)
 824             if (std::strcmp(str, known_strings[i].str) == 0)
 825                 return known_strings[i].is_ntsc ?
 826                     video::ntsc_params : video::pal_params;
 827         throw std::runtime_error(
 828             std::string("Invalid video standard: ").append(str));
 829     }
 830
 831     void print_usage(std::ostream & stream, const char * command_name)
 832     {
 833         stream <<
 834             "Usage: " << command_name << " [gtk-options] [--preview]\n"
 835             "           [--video-std {ntsc|pal|secam}]\n"
 836             "           [--encoder {mjpegtools|mjpegtools-old}]\n"
 837             "           menu-url [output-dir]\n");
 838     }
 839
 840     void set_browser_preferences()
 841     {
 842         nsCOMPtr<nsIPrefService> pref_service;
 843         static const nsCID pref_service_cid = NS_PREFSERVICE_CID;
 844         check(CallGetService<nsIPrefService>(pref_service_cid,
 845                                              getter_AddRefs(pref_service)));
 846         nsCOMPtr<nsIPrefBranch> pref_branch;
 847
 848         // Disable IE-compatibility kluge that causes backgrounds to
 849         // sometimes/usually be missing from snapshots.  This is only
 850         // effective from Mozilla 1.8 onward.
 851 #       if MOZ_VERSION_MAJOR > 1                                 \
 852            || (MOZ_VERSION_MAJOR == 1 && MOZ_VERSION_MINOR >= 8)
 853         check(pref_service->GetDefaultBranch("layout",
 854                                              getter_AddRefs(pref_branch)));
 855         check(pref_branch->SetBoolPref(
 856                   "fire_onload_after_image_background_loads",
 857                   true));
 858 #       endif
 859
 860         // Set display resolution.  With standard-definition video we
 861         // will be fitting ~600 pixels across a screen typically
 862         // ranging from 10 to 25 inches wide, for a resolution of
 863         // 24-60 dpi.  I therefore declare the average horizontal
 864         // resolution to be 40 dpi.  The vertical resolution will be
 865         // slightly higher (PAL/SECAM) or lower (NTSC), but
 866         // unfortunately Mozilla doesn't support non-square pixels
 867         // (and neither do fontconfig or Xft anyway).
 868         check(pref_service->GetDefaultBranch("browser.display",
 869                                              getter_AddRefs(pref_branch)));
 870         check(pref_branch->SetIntPref("screen_resolution", 40));
 871     }
 872
 873 } // namespace
 874
 875 void fatal_error(const std::string & message)
 876 {
 877     std::cerr << "Fatal error: " << message << "\n";
 878     Gtk::Main::quit();
 879 }
 880
 881 int main(int argc, char ** argv)
 882 {
 883     try
 884     {
 885         video::frame_params frame_params = video::pal_params;
 886         bool preview_mode = false;
 887         std::string menu_url;
 888         std::string output_dir;
 889         mpeg_encoder encoder = mpeg_encoder_mjpegtools_new;
 890
 891         // Do initial option parsing.  We have to do this before
 892         // letting Gtk parse the arguments since we may need to spawn
 893         // Xvfb first.
 894         int argi = 1;
 895         while (argi != argc)
 896         {
 897             if (std::strcmp(argv[argi], "--") == 0)
 898             {
 899                 break;
 900             }
 901             else if (std::strcmp(argv[argi], "--help") == 0)
 902             {
 903                 print_usage(std::cout, argv[0]);
 904                 return EXIT_SUCCESS;
 905             }
 906             else if (std::strcmp(argv[argi], "--preview") == 0)
 907             {
 908                 preview_mode = true;
 909                 argi += 1;
 910             }
 911             else if (std::strcmp(argv[argi], "--video-std") == 0)
 912             {
 913                 if (argi + 1 == argc)
 914                 {
 915                     std::cerr << "Missing argument to --video-std\n";
 916                     print_usage(std::cerr, argv[0]);
 917                     return EXIT_FAILURE;
 918                 }
 919                 frame_params = lookup_frame_params(argv[argi + 1]);
 920                 argi += 2;
 921             }
 922             else
 923             {
 924                 argi += 1;
 925             }
 926         }
 927
 928         std::auto_ptr<x_frame_buffer> fb;
 929         if (!preview_mode)
 930         {
 931             // Spawn Xvfb and set env variables so that Xlib will use it
 932             // Use 8 bits each for RGB components, which should translate into
 933             // "enough" bits for YUV components.
 934             fb.reset(new x_frame_buffer(frame_params.width,
 935                                         frame_params.height,
 936                                         3 * 8));
 937             setenv("XAUTHORITY", fb->get_authority().c_str(), true);
 938             setenv("DISPLAY", fb->get_display().c_str(), true);
 939         }
 940
 941         // Initialise Gtk
 942         Gtk::Main kit(argc, argv);
 943
 944         // Complete option parsing with Gtk's options out of the way.
 945         argi = 1;
 946         while (argi != argc)
 947         {
 948             if (std::strcmp(argv[argi], "--") == 0)
 949             {
 950                 argi += 1;
 951                 break;
 952             }
 953             else if (std::strcmp(argv[argi], "--preview") == 0)
 954             {
 955                 argi += 1;
 956             }
 957             else if (std::strcmp(argv[argi], "--video-std") == 0)
 958             {
 959                 argi += 2;
 960             }
 961             else if (std::strcmp(argv[argi], "--save-temps") == 0)
 962             {
 963                 temp_file::keep_all(true);
 964                 argi += 1;
 965             }
 966             else if (std::strcmp(argv[argi], "--encoder") == 0)
 967             {
 968                 if (argi + 1 == argc)
 969                 {
 970                     std::cerr << "Missing argument to --encoder\n";
 971                     print_usage(std::cerr, argv[0]);
 972                     return EXIT_FAILURE;
 973                 }
 974                 if (std::strcmp(argv[argi + 1], "ffmpeg") == 0)
 975                 {
 976                     encoder = mpeg_encoder_ffmpeg;
 977                 }
 978                 else if (std::strcmp(argv[argi + 1], "mjpegtools-old") == 0)
 979                 {
 980                     encoder = mpeg_encoder_mjpegtools_old;
 981                 }
 982                 else if (std::strcmp(argv[argi + 1], "mjpegtools") == 0
 983                          || std::strcmp(argv[argi + 1], "mjpegtools-new") == 0)
 984                 {
 985                     encoder = mpeg_encoder_mjpegtools_new;
 986                 }
 987                 else
 988                 {
 989                     std::cerr << "Invalid argument to --encoder\n";
 990                     print_usage(std::cerr, argv[0]);
 991                     return EXIT_FAILURE;
 992                 }
 993                 argi += 2;
 994             }
 995             else if (argv[argi][0] == '-')
 996             {
 997                 std::cerr << "Invalid option: " << argv[argi] << "\n";
 998                 print_usage(std::cerr, argv[0]);
 999                 return EXIT_FAILURE;
1000             }
1001             else
1002             {
1003                 break;
1004             }
1005         }
1006
1007         // Look for a starting URL or filename and (except in preview
1008         // mode) an output directory after the options.
1009         if (argc - argi != (preview_mode ? 1 : 2))
1010         {
1011             print_usage(std::cerr, argv[0]);
1012             return EXIT_FAILURE;
1013         }
1014         if (std::strstr(argv[argi], "://"))
1015         {
1016             // It appears to be an absolute URL, so use it as-is.
1017             menu_url = argv[argi];
1018         }
1019         else
1020         {
1021             // Assume it's a filename.  Resolve it to an absolute URL.
1022             std::string path(argv[argi]);
1023             if (!Glib::path_is_absolute(path))
1024                 path = Glib::build_filename(Glib::get_current_dir(), path);
1025             menu_url = Glib::filename_to_uri(path);
1026         }
1027         if (!preview_mode)
1028             output_dir = argv[argi + 1];
1029
1030         // Initialise Mozilla
1031         browser_widget::initialiser browser_init;
1032         set_browser_preferences();
1033         if (!preview_mode)
1034             null_prompt_service::install();
1035
1036         // Run the browser/converter
1037         webdvd_window window(frame_params, menu_url, output_dir, encoder);
1038         Gtk::Main::run(window);
1039
1040         return ((preview_mode || window.is_finished())
1041                 ? EXIT_SUCCESS
1042                 : EXIT_FAILURE);
1043     }
1044     catch (std::exception & e)
1045     {
1046         std::cerr << "Fatal error: " << e.what() << "\n";
1047         return EXIT_FAILURE;
1048     }
1049 }