LibWeb: Move m_needs_repaint and record_display_list() in Document

Let's make document responsible for display list invalidation,
considering it already takes care of style and layout.

Userland/Libraries/LibWeb/HTML/AudioTrack.cpp

@@ -31,7 +31,7 @@ AudioTrack::AudioTrack(JS::Realm& realm, JS::NonnullGCPtr<HTMLMediaElement> medi
     , m_audio_plugin(Platform::AudioCodecPlugin::create(move(loader)).release_value_but_fixme_should_propagate_errors())
 {
     m_audio_plugin->on_playback_position_updated = [this](auto position) {
-        if (auto const* paintable = m_media_element->paintable())
+        if (auto* paintable = m_media_element->paintable())
             paintable->set_needs_display();
 
         auto playback_position = static_cast<double>(position.to_milliseconds()) / 1000.0;

Userland/Libraries/LibWeb/HTML/EventLoop/EventLoop.cpp

@@ -209,7 +209,7 @@ void EventLoop::process()
     //         loop processing.
     for_each_fully_active_document_in_docs([&](DOM::Document& document) {
         auto navigable = document.navigable();
-        if (navigable && !navigable->has_a_rendering_opportunity() && navigable->needs_repaint())
+        if (navigable && !navigable->has_a_rendering_opportunity() && document.needs_repaint())
             schedule();
         if (navigable && navigable->has_a_rendering_opportunity())
             return;
@@ -328,7 +328,7 @@ void EventLoop::process()
     // 16. For each fully active Document in docs, update the rendering or user interface of that Document and its browsing context to reflect the current state.
     for_each_fully_active_document_in_docs([&](DOM::Document& document) {
         auto navigable = document.navigable();
-        if (navigable && navigable->needs_repaint()) {
+        if (navigable && document.needs_repaint()) {
             auto* browsing_context = document.browsing_context();
             auto& page = browsing_context->page();
             if (navigable->is_traversable()) {
@@ -341,7 +341,7 @@ void EventLoop::process()
     // FIXME: Not in the spec: If there is a screenshot request queued, process it now.
     //        This prevents tests deadlocking on screenshot requests on macOS.
     for (auto& document : docs) {
-        if (document->page().top_level_traversable()->needs_repaint())
+        if (document->needs_repaint())
             document->page().client().process_screenshot_requests();
     }
 

Userland/Libraries/LibWeb/HTML/Navigable.cpp

@@ -2000,9 +2000,10 @@ void Navigable::set_viewport_size(CSSPixelSize size)
         document->invalidate_style();
         document->set_needs_layout();
     }
-    set_needs_display();
 
     if (auto document = active_document()) {
+        document->set_needs_display();
+
         document->inform_all_viewport_clients_about_the_current_viewport_rect();
 
         // Schedule the HTML event loop to ensure that a `resize` event gets fired.
@@ -2015,9 +2016,9 @@ void Navigable::perform_scroll_of_viewport(CSSPixelPoint new_position)
     if (m_viewport_scroll_offset != new_position) {
         m_viewport_scroll_offset = new_position;
         scroll_offset_did_change();
-        set_needs_display();
 
         if (auto document = active_document()) {
+            document->set_needs_display();
             document->set_needs_to_refresh_scroll_state(true);
             document->inform_all_viewport_clients_about_the_current_viewport_rect();
         }
@@ -2029,24 +2030,9 @@ void Navigable::perform_scroll_of_viewport(CSSPixelPoint new_position)
 
 void Navigable::set_needs_display()
 {
-    set_needs_display(viewport_rect());
-}
-
-void Navigable::set_needs_display(CSSPixelRect const&)
-{
-    // FIXME: Ignore updates outside the visible viewport rect.
-    //        This requires accounting for fixed-position elements in the input rect, which we don't do yet.
-
-    m_needs_repaint = true;
-
-    if (is<TraversableNavigable>(*this)) {
-        // Schedule the main thread event loop, which will, in turn, schedule a repaint.
-        Web::HTML::main_thread_event_loop().schedule();
-        return;
+    if (auto document = active_document(); document) {
+        document->set_needs_display();
     }
-
-    if (container() && container()->paintable())
-        container()->paintable()->set_needs_display();
 }
 
 // https://html.spec.whatwg.org/#rendering-opportunity
@@ -2090,59 +2076,6 @@ void Navigable::inform_the_navigation_api_about_aborting_navigation()
     }));
 }
 
-RefPtr<Painting::DisplayList> Navigable::record_display_list(PaintConfig config)
-{
-    auto document = active_document();
-    if (!document)
-        return {};
-
-    auto display_list = Painting::DisplayList::create();
-    Painting::DisplayListRecorder display_list_recorder(display_list);
-
-    if (config.canvas_fill_rect.has_value()) {
-        display_list_recorder.fill_rect(config.canvas_fill_rect.value(), CSS::SystemColor::canvas());
-    }
-
-    auto const& page = traversable_navigable()->page();
-    auto viewport_rect = page.css_to_device_rect(this->viewport_rect());
-    Gfx::IntRect bitmap_rect { {}, viewport_rect.size().to_type<int>() };
-
-    auto background_color = document->background_color();
-
-    display_list_recorder.fill_rect(bitmap_rect, background_color);
-    if (!document->paintable()) {
-        VERIFY_NOT_REACHED();
-    }
-
-    Web::PaintContext context(display_list_recorder, page.palette(), page.client().device_pixels_per_css_pixel());
-    context.set_device_viewport_rect(viewport_rect);
-    context.set_should_show_line_box_borders(config.should_show_line_box_borders);
-    context.set_should_paint_overlay(config.paint_overlay);
-    context.set_has_focus(config.has_focus);
-
-    document->update_paint_and_hit_testing_properties_if_needed();
-
-    auto& viewport_paintable = *document->paintable();
-
-    viewport_paintable.refresh_scroll_state();
-
-    viewport_paintable.paint_all_phases(context);
-
-    display_list->set_device_pixels_per_css_pixel(page.client().device_pixels_per_css_pixel());
-
-    Vector<RefPtr<Painting::ScrollFrame>> scroll_state;
-    scroll_state.resize(viewport_paintable.scroll_state.size());
-    for (auto& [_, scrollable_frame] : viewport_paintable.scroll_state) {
-        scroll_state[scrollable_frame->id] = scrollable_frame;
-    }
-
-    display_list->set_scroll_state(move(scroll_state));
-
-    m_needs_repaint = false;
-
-    return display_list;
-}
-
 // https://html.spec.whatwg.org/multipage/browsing-the-web.html#event-uni
 UserNavigationInvolvement user_navigation_involvement(DOM::Event const& event)
 {

Userland/Libraries/LibWeb/HTML/Navigable.h

@@ -170,7 +170,6 @@ public:
     void perform_scroll_of_viewport(CSSPixelPoint position);
 
     void set_needs_display();
-    void set_needs_display(CSSPixelRect const&);
 
     void set_is_popup(TokenizedFeature::Popup is_popup) { m_is_popup = is_popup; }
 
@@ -179,16 +178,6 @@ public:
 
     [[nodiscard]] TargetSnapshotParams snapshot_target_snapshot_params();
 
-    [[nodiscard]] bool needs_repaint() const { return m_needs_repaint; }
-
-    struct PaintConfig {
-        bool paint_overlay { false };
-        bool should_show_line_box_borders { false };
-        bool has_focus { false };
-        Optional<Gfx::IntRect> canvas_fill_rect {};
-    };
-    RefPtr<Painting::DisplayList> record_display_list(PaintConfig);
-
     Page& page() { return m_page; }
     Page const& page() const { return m_page; }
 
@@ -245,8 +234,6 @@ private:
     CSSPixelSize m_size;
     CSSPixelPoint m_viewport_scroll_offset;
 
-    bool m_needs_repaint { false };
-
     Web::EventHandler m_event_handler;
 };
 

Userland/Libraries/LibWeb/HTML/TraversableNavigable.cpp

@@ -1189,12 +1189,16 @@ JS::GCPtr<DOM::Node> TraversableNavigable::currently_focused_area()
 
 void TraversableNavigable::paint(DevicePixelRect const& content_rect, Painting::BackingStore& target, PaintOptions paint_options)
 {
-    HTML::Navigable::PaintConfig paint_config;
+    auto document = active_document();
+    if (!document)
+        return;
+
+    DOM::Document::PaintConfig paint_config;
     paint_config.paint_overlay = paint_options.paint_overlay == PaintOptions::PaintOverlay::Yes;
     paint_config.should_show_line_box_borders = paint_options.should_show_line_box_borders;
     paint_config.has_focus = paint_options.has_focus;
     paint_config.canvas_fill_rect = Gfx::IntRect { {}, content_rect.size() };
-    auto display_list = record_display_list(paint_config);
+    auto display_list = document->record_display_list(paint_config);
     if (!display_list) {
         return;
     }