Treat video elements as replaced content and render the current frame. (#31412)

* Treat video elements as replaced content and render the current frame.

* Update test results.

components/layout_2020/dom.rs

@@ -93,6 +93,7 @@ pub(crate) trait NodeExt<'dom>: 'dom + LayoutNode<'dom> {
     fn as_image(self) -> Option<(Option<Arc<NetImage>>, PhysicalSize<f64>)>;
     fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)>;
     fn as_iframe(self) -> Option<(PipelineId, BrowsingContextId)>;
+    fn as_video(self) -> Option<(webrender_api::ImageKey, PhysicalSize<f64>)>;
     fn style(self, context: &LayoutContext) -> ServoArc<ComputedValues>;
 
     fn get_style_and_layout_data(self) -> Option<StyleAndLayoutData<'dom>>;
@@ -125,6 +126,13 @@ where
         Some((resource, PhysicalSize::new(width, height)))
     }
 
+    fn as_video(self) -> Option<(webrender_api::ImageKey, PhysicalSize<f64>)> {
+        let node = self.to_threadsafe();
+        let frame_data = node.media_data()?.current_frame?;
+        let (width, height) = (frame_data.1 as f64, frame_data.2 as f64);
+        Some((frame_data.0, PhysicalSize::new(width, height)))
+    }
+
     fn as_canvas(self) -> Option<(CanvasInfo, PhysicalSize<f64>)> {
         let node = self.to_threadsafe();
         let canvas_data = node.canvas_data()?;

components/layout_2020/replaced.rs

@@ -117,11 +117,17 @@ pub(crate) struct IFrameInfo {
     pub browsing_context_id: BrowsingContextId,
 }
 
+#[derive(Debug, Serialize)]
+pub(crate) struct VideoInfo {
+    pub image_key: webrender_api::ImageKey,
+}
+
 #[derive(Debug, Serialize)]
 pub(crate) enum ReplacedContentKind {
     Image(Option<Arc<Image>>),
     IFrame(IFrameInfo),
     Canvas(CanvasInfo),
+    Video(VideoInfo),
 }
 
 impl ReplacedContent {
@@ -145,6 +151,11 @@ impl ReplacedContent {
                     }),
                     None,
                 )
+            } else if let Some((image_key, intrinsic_size_in_dots)) = element.as_video() {
+                (
+                    ReplacedContentKind::Video(VideoInfo { image_key }),
+                    Some(intrinsic_size_in_dots),
+                )
             } else {
                 return None;
             }
@@ -263,6 +274,15 @@ impl ReplacedContent {
                 })
                 .into_iter()
                 .collect(),
+            ReplacedContentKind::Video(video) => vec![Fragment::Image(ImageFragment {
+                base: self.base_fragment_info.into(),
+                style: style.clone(),
+                rect: LogicalRect {
+                    start_corner: LogicalVec2::zero(),
+                    size: size.into(),
+                },
+                image_key: video.image_key,
+            })],
             ReplacedContentKind::IFrame(iframe) => {
                 vec![Fragment::IFrame(IFrameFragment {
                     base: self.base_fragment_info.into(),

tests/wpt/meta/css/css-images/object-view-box-fit-cover-video.html.ini

@@ -0,0 +1,2 @@
+[object-view-box-fit-cover-video.html]
+  expected: FAIL

tests/wpt/meta/css/css-images/object-view-box-writing-mode-video.html.ini

@@ -0,0 +1,2 @@
+[object-view-box-writing-mode-video.html]
+  expected: FAIL

tests/wpt/meta/html/semantics/embedded-content/the-video-element/video_dynamic_poster_absolute.htm.ini

@@ -1,2 +0,0 @@
-[video_dynamic_poster_absolute.htm]
-  expected: FAIL

tests/wpt/meta/html/semantics/embedded-content/the-video-element/video_dynamic_poster_relative.htm.ini

@@ -1,2 +0,0 @@
-[video_dynamic_poster_relative.htm]
-  expected: FAIL