]> git.decadent.org.uk Git - videolink.git/blobdiff - webdvd.cpp
Added comments.
[videolink.git] / webdvd.cpp
index a6064b2bf33bf65fc9b904fd9b54b023c0861ba5..6c6419e70afd8cf27ff686f8dcfeb5abfc9dbf22 100644 (file)
@@ -110,6 +110,7 @@ namespace
     {
        rectangle result;
 
+       // Start with this element's bounding box
        nsCOMPtr<nsIBoxObject> box;
        check(ns_doc->GetBoxObjectFor(elem, getter_AddRefs(box)));
        int width, height;
@@ -120,6 +121,7 @@ namespace
        result.right = result.left + width;
        result.bottom = result.top + height;
 
+       // Merge bounding boxes of all child elements
        for (ChildIterator it = ChildIterator(elem), end; it != end; ++it)
        {
            nsCOMPtr<nsIDOMNode> child_node(*it);
@@ -149,6 +151,7 @@ namespace
        void add_video(const std::string & uri);
        void load_next_page();
        void on_net_state_change(const char * uri, gint flags, guint status);
+       bool process_page();
        void save_screenshot();
        void process_links(nsIPresShell * pres_shell,
                           nsIPresContext * pres_context,
@@ -165,11 +168,11 @@ namespace
        std::map<std::string, ResourceEntry> resource_map_;
        std::vector<std::vector<std::string> > page_links_;
        std::vector<std::string> video_paths_;
-       bool loading_;
+       bool pending_window_update_;
        int pending_req_count_;
        std::auto_ptr<temp_file> background_temp_;
-       struct link_state;
-       std::auto_ptr<link_state> link_state_;
+       struct page_state;
+       std::auto_ptr<page_state> page_state_;
        std::vector<boost::shared_ptr<temp_file> > page_temp_files_;
     };
 
@@ -180,7 +183,7 @@ namespace
            : frame_params_(frame_params),
              output_dir_(output_dir),
              stylesheet_(load_css("file://" WEBDVD_LIB_DIR "/webdvd.css")),
-             loading_(false),
+             pending_window_update_(false),
              pending_req_count_(0)
     {
        set_default_size(frame_params_.width, frame_params_.height);
@@ -220,8 +223,6 @@ namespace
 
     void WebDvdWindow::load_next_page()
     {
-       loading_ = true;
-
        assert(!page_queue_.empty());
        const std::string & uri = page_queue_.front();
        std::cout << "loading " << uri << std::endl;
@@ -229,77 +230,43 @@ namespace
        std::size_t page_count = page_links_.size();
        resource_map_[uri].second = ++page_count;
        page_links_.resize(page_count);
+
+       pending_window_update_ = true;
        browser_widget_.load_uri(uri);
     }
 
     void WebDvdWindow::on_net_state_change(const char * uri,
                                           gint flags, guint status)
     {
-       enum {
-           process_nothing,
-           process_new_page,
-           process_current_link
-       } action = process_nothing;
-
        if (flags & GTK_MOZ_EMBED_FLAG_IS_REQUEST)
        {
            if (flags & GTK_MOZ_EMBED_FLAG_START)
                ++pending_req_count_;
+
            if (flags & GTK_MOZ_EMBED_FLAG_STOP)
            {
                assert(pending_req_count_ != 0);
                --pending_req_count_;
            }
-           if (pending_req_count_ == 0 && link_state_.get())
-               action = process_current_link;
        }
            
        if (flags & GTK_MOZ_EMBED_FLAG_STOP
            && flags & GTK_MOZ_EMBED_FLAG_IS_WINDOW)
-           action = process_new_page;
-
-       if (action != process_nothing)
        {
-           assert(loading_ && !page_queue_.empty());
-           assert(pending_req_count_ == 0);
+           // Check whether the load was successful, ignoring this
+           // pseudo-error.
+           if (status != NS_IMAGELIB_ERROR_LOAD_ABORTED)
+               check(status);
 
+           pending_window_update_ = false;
+       }
+
+       if (pending_req_count_ == 0 && !pending_window_update_)
+       {
            try
            {
-               // Check whether the load was successful, ignoring this
-               // pseudo-error.
-               if (status != NS_IMAGELIB_ERROR_LOAD_ABORTED)
-                   check(status);
-
-               nsCOMPtr<nsIWebBrowser> browser(
-                   browser_widget_.get_browser());
-               nsCOMPtr<nsIDocShell> doc_shell(do_GetInterface(browser));
-               assert(doc_shell);
-               nsCOMPtr<nsIPresShell> pres_shell;
-               check(doc_shell->GetPresShell(getter_AddRefs(pres_shell)));
-               nsCOMPtr<nsIPresContext> pres_context;
-               check(doc_shell->GetPresContext(
-                         getter_AddRefs(pres_context)));
-               nsCOMPtr<nsIDOMWindow> dom_window;
-               check(browser->GetContentDOMWindow(
-                         getter_AddRefs(dom_window)));
-
-               if (action == process_new_page)
-               {
-                   apply_style_sheet(stylesheet_, pres_shell);
-                   save_screenshot();
-               }
-               process_links(pres_shell, pres_context, dom_window);
-               if (!link_state_.get())
-               {
-                   page_queue_.pop();
-                   if (page_queue_.empty())
-                   {
-                       generate_dvd();
-                       Gtk::Main::quit();
-                   }
-                   else
-                       load_next_page();
-               }
+               if (!process_page())
+                   Gtk::Main::quit();
            }
            catch (std::exception & e)
            {
@@ -313,6 +280,60 @@ namespace
        }
     }
 
+    bool WebDvdWindow::process_page()
+    {
+       assert(!page_queue_.empty());
+
+       nsCOMPtr<nsIWebBrowser> browser(browser_widget_.get_browser());
+       nsCOMPtr<nsIDocShell> doc_shell(do_GetInterface(browser));
+       assert(doc_shell);
+       nsCOMPtr<nsIPresShell> pres_shell;
+       check(doc_shell->GetPresShell(getter_AddRefs(pres_shell)));
+       nsCOMPtr<nsIPresContext> pres_context;
+       check(doc_shell->GetPresContext(getter_AddRefs(pres_context)));
+       nsCOMPtr<nsIDOMWindow> dom_window;
+       check(browser->GetContentDOMWindow(getter_AddRefs(dom_window)));
+
+       if (output_dir_.empty())
+       {
+           // In preview mode, just apply the stylesheet and let the
+           // user select links.
+           apply_style_sheet(stylesheet_, pres_shell);
+       }
+       else
+       {
+           // If we haven't already started work on this page, apply
+           // the stylesheet and save a screenshot of its normal
+           // appearance.
+           if (!page_state_.get())
+           {
+               apply_style_sheet(stylesheet_, pres_shell);
+               save_screenshot();
+           }
+
+           // Start or continue processing links.
+           process_links(pres_shell, pres_context, dom_window);
+
+           // If we've finished work on the links, move on to the
+           // next page, if any, or else generate the DVD filesystem.
+           if (!page_state_.get())
+           {
+               page_queue_.pop();
+               if (page_queue_.empty())
+               {
+                   generate_dvd();
+                   return false;
+               }
+               else
+               {
+                   load_next_page();
+               }
+           }
+       }
+
+       return true;
+    }
+
     void WebDvdWindow::save_screenshot()
     {
        Glib::RefPtr<Gdk::Window> window(get_window());
@@ -329,14 +350,29 @@ namespace
            ->save(background_temp_->get_name(), "png");
     }
 
-    struct WebDvdWindow::link_state
+    struct WebDvdWindow::page_state
     {
+       page_state(nsIDOMDocument * doc, int width, int height)
+               : diff_pixbuf(Gdk::Pixbuf::create(
+                                 Gdk::COLORSPACE_RGB,
+                                 true, 8, // has_alpha, bits_per_sample
+                                 width, height)),
+                 spumux_temp("webdvd-spumux-"),
+                 links_temp("webdvd-links-"),
+                 link_num(0),
+                 links_it(doc),
+                 link_changing(false)
+           {
+               spumux_temp.close();
+               links_temp.close();
+           }
+
        Glib::RefPtr<Gdk::Pixbuf> diff_pixbuf;
 
-       std::auto_ptr<temp_file> spumux_temp;
+       temp_file spumux_temp;
        std::ofstream spumux_file;
 
-       std::auto_ptr<temp_file> links_temp;
+       temp_file links_temp;
 
        int link_num;
        LinkIterator links_it, links_end;
@@ -369,37 +405,22 @@ namespace
        check(doc_view->GetDefaultView(getter_AddRefs(view)));
 
        // Set up or recover our iteration state.
-       std::auto_ptr<link_state> state(link_state_);
+       std::auto_ptr<page_state> state(page_state_);
        if (!state.get())
        {
-           state.reset(new link_state);
-
-           state->diff_pixbuf = Gdk::Pixbuf::create(
-               Gdk::COLORSPACE_RGB,
-               true, 8, // has_alpha, bits_per_sample
-               frame_params_.width, frame_params_.height);
-
-           state->spumux_temp.reset(new temp_file("webdvd-spumux-"));
-           state->spumux_temp->close();
-
-           state->links_temp.reset(new temp_file("webdvd-links-"));
-           state->links_temp->close();
+           state.reset(
+               new page_state(
+                   basic_doc, frame_params_.width, frame_params_.height));
            
-           state->spumux_file.open(state->spumux_temp->get_name().c_str());
+           state->spumux_file.open(state->spumux_temp.get_name().c_str());
            state->spumux_file <<
                "<subpictures>\n"
                "  <stream>\n"
                "    <spu force='yes' start='00:00:00.00'\n"
-               "        highlight='" << state->links_temp->get_name()
-                              << "'\n"
-               "        select='" << state->links_temp->get_name()
-                              << "'>\n";
-
-           state->link_num = 0;
-           state->links_it = LinkIterator(basic_doc);
-           state->link_changing = false;
+               "        highlight='" << state->links_temp.get_name() << "'\n"
+               "        select='" << state->links_temp.get_name() << "'>\n";
        }
-           
+
        rectangle window_rect = {
            0, 0, frame_params_.width, frame_params_.height
        };
@@ -526,7 +547,7 @@ namespace
                if (pending_req_count_ > 0)
                {
                    state->link_changing = true;
-                   link_state_ = state;
+                   page_state_ = state;
                    return;
                }
            }
@@ -564,9 +585,9 @@ namespace
 
        quantise_rgba_pixbuf(state->diff_pixbuf, dvd::button_n_colours);
 
-       std::cout << "saving " << state->links_temp->get_name()
+       std::cout << "saving " << state->links_temp.get_name()
                  << std::endl;
-       state->diff_pixbuf->save(state->links_temp->get_name(), "png");
+       state->diff_pixbuf->save(state->links_temp.get_name(), "png");
 
        state->spumux_file <<
            "    </spu>\n"
@@ -592,7 +613,7 @@ namespace
                               " | mpeg2enc -v0 -f8 -a2 -o/dev/stdout"
                               " | mplex -v0 -f8 -o/dev/stdout /dev/stdin"
                               " | spumux -v0 -mdvd ")
-                          << state->spumux_temp->get_name()
+                          << state->spumux_temp.get_name()
                           << " > " << vob_temp->get_name();
            std::string command(command_stream.str());
            const char * argv[] = {
@@ -867,75 +888,114 @@ namespace
            std::string("Invalid video standard: ").append(str));
     }
 
+    void print_usage(std::ostream & stream, const char * command_name)
+    {
+       stream << "Usage: " << command_name
+              << (" [gtk-options] [--video-std std-name]"
+                  " [--preview] menu-url [output-dir]\n");
+    }
+    
 } // namespace
 
 int main(int argc, char ** argv)
 {
     try
     {
-       // Determine video frame parameters.
        video::frame_params frame_params = video::pal_params;
-       for (int argi = 1; argi != argc; ++argi)
+       bool preview_mode = false;
+
+       // Do initial argument parsing.  We have to do this before
+       // letting Gtk parse the arguments since we may need to spawn
+       // Xvfb first.
+       int argi = 1;
+       while (argi != argc)
        {
            if (std::strcmp(argv[argi], "--") == 0)
+           {
                break;
-           if (std::strcmp(argv[argi], "--video-std") == 0)
+           }
+           else if (std::strcmp(argv[argi], "--help") == 0)
+           {
+               print_usage(std::cout, argv[0]);
+               return EXIT_SUCCESS;
+           }
+           else if (std::strcmp(argv[argi], "--preview") == 0)
+           {
+               preview_mode = true;
+               argi += 1;
+           }
+           else if (std::strcmp(argv[argi], "--video-std") == 0)
            {
                if (argi + 1 == argc)
                {
                    std::cerr << "Missing argument to --video-std\n";
+                   print_usage(std::cerr, argv[0]);
                    return EXIT_FAILURE;
                }
                frame_params = lookup_frame_params(argv[argi + 1]);
-               break;
+               argi += 2;
+           }
+           else
+           {
+               argi += 1;
            }
        }
-       
-       // Spawn Xvfb and set env variables so that Xlib will use it
-       // Use 8 bits each for RGB components, which should translate into
-       // "enough" bits for YUV components.
-       FrameBuffer fb(frame_params.width, frame_params.height, 3 * 8);
-       setenv("XAUTHORITY", fb.get_x_authority().c_str(), true);
-       setenv("DISPLAY", fb.get_x_display().c_str(), true);
+
+       std::auto_ptr<FrameBuffer> fb;
+       if (!preview_mode)
+       {
+           // Spawn Xvfb and set env variables so that Xlib will use it
+           // Use 8 bits each for RGB components, which should translate into
+           // "enough" bits for YUV components.
+           fb.reset(new FrameBuffer(frame_params.width, frame_params.height,
+                                    3 * 8));
+           setenv("XAUTHORITY", fb->get_x_authority().c_str(), true);
+           setenv("DISPLAY", fb->get_x_display().c_str(), true);
+       }
 
        // Initialise Gtk
        Gtk::Main kit(argc, argv);
 
-       // Check we have the right number of arguments.  We can't
-       // do this earlier because we need to let Gtk read and remove
-       // any of the many options it understands.
-       int argi = 1;
+       // Complete argument parsing with Gtk's options out of the way.
+       argi = 1;
        while (argi != argc)
        {
-           if (std::strcmp(argv[argi], "--video-std") == 0)
+           if (std::strcmp(argv[argi], "--") == 0)
            {
-               argi += 2;
+               argi += 1;
+               break;
            }
-           else if (std::strcmp(argv[argi], "--") == 0)
+           else if (std::strcmp(argv[argi], "--preview") == 0)
            {
                argi += 1;
-               break;
+           }
+           else if (std::strcmp(argv[argi], "--video-std") == 0)
+           {
+               argi += 2;
            }
            else if (argv[argi][0] == '-')
            {
                std::cerr << "Invalid option: " << argv[argi] << "\n";
+               print_usage(std::cerr, argv[0]);
                return EXIT_FAILURE;
            }
            else
+           {
                break;
+           }
        }
-       if (argi != argc - 2)
+       if (argc - argi != (preview_mode ? 1 : 2))
        {
-           std::cerr << "Usage: " << argv[0]
-                     << (" [gtk-options] [--video-std std-name]"
-                         "front-page-url output-dir\n");
+           print_usage(std::cerr, argv[0]);
            return EXIT_FAILURE;
        }
 
        // Initialise Mozilla
        BrowserWidget::init();
 
-       WebDvdWindow window(frame_params, argv[argi], argv[argi + 1]);
+       WebDvdWindow window(frame_params,
+                           argv[argi],
+                           preview_mode ? "" : argv[argi + 1]);
        Gtk::Main::run(window);
     }
     catch (std::exception & e)