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