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layout: Make the compositor rather than layout determine the position of
each iframe. The old code that attempted to do this during layout wasn't able to work for multiple reasons: it couldn't know where the iframe was going to be on the page (because of nested iframes), and at the time it was building the display list for a fragment it couldn't know where that fragment was going to be in page coordinates. This patch rewrites that code so that both the sizes and positions of iframes are determined by the compositor. Layout layerizes all iframes and marks the iframe layers with the appropriate pipeline and subpage IDs so that the compositor can place them correctly. This approach is similar in spirit to Gecko's `RefLayer` infrastructure. The logic that determines when it is time to take the screenshot for reftests has been significantly revamped to deal with this change in delegation of responsibility. Additionally, this code removes the infrastructure that sends layout data back to the layout task to be destroyed, since it is now all thread-safe and can be destroyed on the script task. The failing tests now fail because of a pre-existing bug related to intrinsic heights and borders on inline replaced elements. They happened to pass before because we never rendered the iframes at all, which meant they never had a chance to draw the red border the tests expect to not render! Closes #7377.
This commit is contained in:
Patrick Walton
parent
ed0d70e234
commit
c72d0c2ed0
20 changed files with 602 additions and 389 deletions
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@ -14,13 +14,12 @@ use azure::azure_hl::Color;
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use block::BlockFlow;
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use canvas_traits::{CanvasMsg, FromLayoutMsg};
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use context::LayoutContext;
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use euclid::Matrix4;
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use euclid::{Point2D, Point3D, Rect, SideOffsets2D, Size2D};
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use euclid::{Matrix4, Point2D, Point3D, Rect, SideOffsets2D, Size2D};
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use flex::FlexFlow;
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use flow::{self, BaseFlow, Flow, IS_ABSOLUTELY_POSITIONED};
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use flow_ref;
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use fragment::{CoordinateSystem, Fragment, HAS_LAYER, IframeFragmentInfo, ImageFragmentInfo};
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use fragment::{ScannedTextFragmentInfo, SpecificFragmentInfo};
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use fragment::{CoordinateSystem, Fragment, HAS_LAYER, ImageFragmentInfo, ScannedTextFragmentInfo};
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use fragment::{SpecificFragmentInfo};
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use gfx::display_list::{BLUR_INFLATION_FACTOR, BaseDisplayItem, BorderDisplayItem};
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use gfx::display_list::{BorderRadii, BoxShadowClipMode, BoxShadowDisplayItem, ClippingRegion};
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use gfx::display_list::{DisplayItem, DisplayItemMetadata, DisplayList};
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@ -35,9 +34,7 @@ use inline::{FIRST_FRAGMENT_OF_ELEMENT, InlineFlow, LAST_FRAGMENT_OF_ELEMENT};
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use ipc_channel::ipc::{self, IpcSharedMemory};
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use list_item::ListItemFlow;
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use model::{self, MaybeAuto, ToGfxMatrix};
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use msg::compositor_msg::{LayerId, ScrollPolicy};
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use msg::constellation_msg::ConstellationChan;
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use msg::constellation_msg::Msg as ConstellationMsg;
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use msg::compositor_msg::{LayerId, ScrollPolicy, SubpageLayerInfo};
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use net_traits::image::base::{Image, PixelFormat};
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use net_traits::image_cache_task::UsePlaceholder;
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use std::default::Default;
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@ -70,7 +67,7 @@ const INSERTION_POINT_LOGICAL_WIDTH: Au = Au(1 * AU_PER_PX);
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/// Whether a stacking context needs a layer or not.
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pub enum StackingContextLayerNecessity {
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Always(LayerId, ScrollPolicy),
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IfCanvas(LayerId),
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IfCanvasOrIframe(LayerId),
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}
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/// The results of display list building for a single flow.
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@ -206,13 +203,6 @@ pub trait FragmentDisplayListBuilding {
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clip: &ClippingRegion,
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stacking_relative_display_port: &Rect<Au>);
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/// Sends the size and position of this iframe fragment to the constellation. This is out of
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/// line to guide inlining.
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fn finalize_position_and_size_of_iframe(&self,
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iframe_fragment: &IframeFragmentInfo,
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offset: Point2D<Au>,
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layout_context: &LayoutContext);
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/// Returns the appropriate clipping region for descendants of this fragment.
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fn clipping_region_for_children(&self,
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current_clip: &ClippingRegion,
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@ -270,7 +260,6 @@ pub trait FragmentDisplayListBuilding {
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needs_layer: StackingContextLayerNecessity,
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mode: StackingContextCreationMode)
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-> Arc<StackingContext>;
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}
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fn handle_overlapping_radii(size: &Size2D<Au>, radii: &BorderRadii<Au>) -> BorderRadii<Au> {
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@ -1060,28 +1049,6 @@ impl FragmentDisplayListBuilding for Fragment {
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&stacking_relative_border_box,
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&clip)
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}
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// If this is an iframe, then send its position and size up to the constellation.
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//
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// FIXME(pcwalton): Doing this during display list construction seems potentially
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// problematic if iframes are outside the area we're computing the display list for, since
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// they won't be able to reflow at all until the user scrolls to them. Perhaps we should
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// separate this into two parts: first we should send the size only to the constellation
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// once that's computed during assign-block-sizes, and second we should should send the
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// origin to the constellation here during display list construction. This should work
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// because layout for the iframe only needs to know size, and origin is only relevant if
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// the iframe is actually going to be displayed.
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if let SpecificFragmentInfo::Iframe(ref iframe_fragment) = self.specific {
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let stacking_relative_border_box_in_parent_coordinate_system =
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self.stacking_relative_border_box(stacking_relative_flow_origin,
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relative_containing_block_size,
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relative_containing_block_mode,
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CoordinateSystem::Parent);
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self.finalize_position_and_size_of_iframe(
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&**iframe_fragment,
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stacking_relative_border_box_in_parent_coordinate_system.origin,
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layout_context)
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}
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}
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fn build_fragment_type_specific_display_items(&mut self,
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@ -1317,15 +1284,18 @@ impl FragmentDisplayListBuilding for Fragment {
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filters.push(Filter::Opacity(effects.opacity))
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}
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// Ensure every canvas has a layer
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// Ensure every canvas or iframe has a layer.
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let (scroll_policy, layer_id) = match needs_layer {
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StackingContextLayerNecessity::Always(layer_id, scroll_policy) =>
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(scroll_policy, Some(layer_id)),
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StackingContextLayerNecessity::IfCanvas(layer_id) => {
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if let SpecificFragmentInfo::Canvas(_) = self.specific {
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(ScrollPolicy::Scrollable, Some(layer_id))
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} else {
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(ScrollPolicy::Scrollable, None)
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StackingContextLayerNecessity::Always(layer_id, scroll_policy) => {
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(scroll_policy, Some(layer_id))
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}
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StackingContextLayerNecessity::IfCanvasOrIframe(layer_id) => {
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// FIXME(pcwalton): So so bogus :(
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match self.specific {
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SpecificFragmentInfo::Canvas(_) | SpecificFragmentInfo::Iframe(_) => {
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(ScrollPolicy::Scrollable, Some(layer_id))
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}
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_ => (ScrollPolicy::Scrollable, None),
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}
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}
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};
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@ -1341,6 +1311,18 @@ impl FragmentDisplayListBuilding for Fragment {
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}
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}
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let subpage_layer_info = match self.specific {
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SpecificFragmentInfo::Iframe(ref iframe_fragment_info) => {
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let border_padding = self.border_padding.to_physical(self.style().writing_mode);
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Some(SubpageLayerInfo {
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pipeline_id: iframe_fragment_info.pipeline_id,
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subpage_id: iframe_fragment_info.subpage_id,
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origin: Point2D::new(border_padding.left, border_padding.top),
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})
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}
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_ => None,
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};
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let scrolls_overflow_area = mode == StackingContextCreationMode::OuterScrollWrapper;
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let transform_style = self.style().get_used_transform_style();
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let establishes_3d_context = scrolls_overflow_area ||
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@ -1357,28 +1339,8 @@ impl FragmentDisplayListBuilding for Fragment {
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establishes_3d_context,
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scrolls_overflow_area,
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scroll_policy,
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layer_id))
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}
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#[inline(never)]
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fn finalize_position_and_size_of_iframe(&self,
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iframe_fragment: &IframeFragmentInfo,
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offset: Point2D<Au>,
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layout_context: &LayoutContext) {
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let border_padding = (self.border_padding).to_physical(self.style.writing_mode);
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let content_size = self.content_box().size.to_physical(self.style.writing_mode);
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let iframe_rect = Rect::new(Point2D::new((offset.x + border_padding.left).to_f32_px(),
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(offset.y + border_padding.top).to_f32_px()),
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Size2D::new(content_size.width.to_f32_px(),
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content_size.height.to_f32_px()));
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debug!("finalizing position and size of iframe for {:?},{:?}",
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iframe_fragment.pipeline_id,
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iframe_fragment.subpage_id);
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let ConstellationChan(ref chan) = layout_context.shared.constellation_chan;
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chan.send(ConstellationMsg::FrameRect(iframe_fragment.pipeline_id,
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iframe_fragment.subpage_id,
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iframe_rect)).unwrap();
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layer_id,
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subpage_layer_info))
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}
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fn clipping_region_for_children(&self,
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@ -1643,7 +1605,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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&self.base,
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display_list,
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layout_context,
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StackingContextLayerNecessity::IfCanvas(self.layer_id()),
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StackingContextLayerNecessity::IfCanvasOrIframe(self.layer_id()),
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StackingContextCreationMode::Normal))
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} else {
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match self.fragment.style.get_box().position {
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@ -1720,7 +1682,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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&self.base,
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display_list,
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layout_context,
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StackingContextLayerNecessity::IfCanvas(self.layer_id()),
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StackingContextLayerNecessity::IfCanvasOrIframe(self.layer_id()),
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StackingContextCreationMode::Normal));
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}
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return
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@ -1785,7 +1747,7 @@ impl BlockFlowDisplayListBuilding for BlockFlow {
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&self.base,
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display_list,
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layout_context,
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StackingContextLayerNecessity::IfCanvas(self.layer_id()),
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StackingContextLayerNecessity::IfCanvasOrIframe(self.layer_id()),
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StackingContextCreationMode::Normal))
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} else {
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DisplayListBuildingResult::Normal(display_list)
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@ -1871,13 +1833,17 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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// FIXME(Savago): fix Fragment::establishes_stacking_context() for absolute positioned item
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// and remove the check for filter presence. Further details on #5812.
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has_stacking_context = has_stacking_context && {
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if let SpecificFragmentInfo::Canvas(_) = self.fragments.fragments[0].specific {
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true
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} else {
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!self.fragments.fragments[0].style().get_effects().filter.is_empty()
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//
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// FIXME(#7424, pcwalton): This is terribly bogus! What is even going on here?
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if has_stacking_context {
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match self.fragments.fragments[0].specific {
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SpecificFragmentInfo::Canvas(_) | SpecificFragmentInfo::Iframe(_) => {}
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_ => {
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has_stacking_context =
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!self.fragments.fragments[0].style().get_effects().filter.is_empty()
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}
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}
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};
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}
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self.base.display_list_building_result = if has_stacking_context {
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DisplayListBuildingResult::StackingContext(
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@ -1885,7 +1851,8 @@ impl InlineFlowDisplayListBuilding for InlineFlow {
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&self.base,
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display_list,
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layout_context,
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StackingContextLayerNecessity::IfCanvas(self.layer_id()),
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StackingContextLayerNecessity::Always(self.layer_id(),
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ScrollPolicy::Scrollable),
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StackingContextCreationMode::Normal))
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} else {
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DisplayListBuildingResult::Normal(display_list)
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