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9c0561536d
* script: Do not run layout in a thread Instead of spawning a thread for layout that almost always runs synchronously with script, simply run layout in the script thread. This is a resurrection of #28708, taking just the bits that remove the layout thread. It's a complex change and thus is just a first step toward cleaning up the interface between script and layout. Messages are still passed from script to layout via a `process()` method and script proxies some messages to layout from other threads as well. Big changes: 1. Layout is created in the script thread on Document load, thus every live document is guaranteed to have a layout. This isn't completely hidden in the interface, but we can safely `unwrap()` on a Document's layout. 2. Layout configuration is abstracted away into a LayoutConfig struct and the LayoutFactory is a struct passed around by the Constellation. This is to avoid having to monomorphize the entire script thread for each layout. 3. Instead of having the Constellation block on the layout thread to figure out the current epoch and whether there are pending web fonts loading, updates are sent synchronously to the Constellation when rendering to a screenshot. This practically only used by the WPT. A couple tests start to fail, which is probably inevitable since removing the layout thread has introduced timing changes in "exit after load" and screenshot behavior. Co-authored-by: Josh Matthews <josh@joshmatthews.net> * Update test expectations * Fix some issues found during review * Clarify some comments * Address review comments --------- Co-authored-by: Josh Matthews <josh@joshmatthews.net>
1257 lines
45 KiB
Rust
1257 lines
45 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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//! Utilities for querying the layout, as needed by layout.
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use std::cmp::{max, min};
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use std::ops::Deref;
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use std::sync::{Arc, Mutex};
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use app_units::Au;
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use euclid::default::{Box2D, Point2D, Rect, Size2D, Vector2D};
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use euclid::Size2D as TypedSize2D;
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use ipc_channel::ipc::IpcSender;
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use msg::constellation_msg::PipelineId;
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use script_layout_interface::rpc::{
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ContentBoxResponse, ContentBoxesResponse, LayoutRPC, NodeGeometryResponse,
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NodeScrollIdResponse, OffsetParentResponse, ResolvedStyleResponse, TextIndexResponse,
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};
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use script_layout_interface::wrapper_traits::{
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LayoutNode, ThreadSafeLayoutElement, ThreadSafeLayoutNode,
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};
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use script_layout_interface::{LayoutElementType, LayoutNodeType};
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use script_traits::{LayoutMsg as ConstellationMsg, UntrustedNodeAddress};
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use servo_arc::Arc as ServoArc;
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use servo_url::ServoUrl;
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use style::computed_values::display::T as Display;
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use style::computed_values::position::T as Position;
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use style::computed_values::visibility::T as Visibility;
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use style::context::{QuirksMode, SharedStyleContext, StyleContext, ThreadLocalStyleContext};
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use style::dom::TElement;
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use style::logical_geometry::{BlockFlowDirection, InlineBaseDirection, WritingMode};
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use style::properties::style_structs::{self, Font};
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use style::properties::{
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parse_one_declaration_into, ComputedValues, Importance, LonghandId, PropertyDeclarationBlock,
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PropertyDeclarationId, PropertyId, SourcePropertyDeclaration,
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};
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use style::selector_parser::PseudoElement;
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use style::shared_lock::SharedRwLock;
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use style::stylesheets::{CssRuleType, Origin, UrlExtraData};
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use style_traits::{CSSPixel, ParsingMode, ToCss};
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use webrender_api::ExternalScrollId;
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use crate::construct::ConstructionResult;
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use crate::context::LayoutContext;
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use crate::display_list::items::{DisplayList, OpaqueNode, ScrollOffsetMap};
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use crate::display_list::IndexableText;
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use crate::flow::{Flow, GetBaseFlow};
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use crate::fragment::{Fragment, FragmentBorderBoxIterator, FragmentFlags, SpecificFragmentInfo};
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use crate::inline::InlineFragmentNodeFlags;
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use crate::sequential;
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use crate::wrapper::LayoutNodeLayoutData;
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/// Mutable data belonging to the LayoutThread.
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///
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/// This needs to be protected by a mutex so we can do fast RPCs.
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pub struct LayoutThreadData {
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/// The channel on which messages can be sent to the constellation.
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pub constellation_chan: IpcSender<ConstellationMsg>,
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/// The root stacking context.
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pub display_list: Option<DisplayList>,
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pub indexable_text: IndexableText,
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/// A queued response for the union of the content boxes of a node.
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pub content_box_response: Option<Rect<Au>>,
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/// A queued response for the content boxes of a node.
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pub content_boxes_response: Vec<Rect<Au>>,
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/// A queued response for the client {top, left, width, height} of a node in pixels.
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pub client_rect_response: Rect<i32>,
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/// A queued response for the scroll id for a given node.
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pub scroll_id_response: Option<ExternalScrollId>,
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/// A queued response for the scroll {top, left, width, height} of a node in pixels.
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pub scrolling_area_response: Rect<i32>,
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/// A queued response for the resolved style property of an element.
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pub resolved_style_response: String,
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/// A queued response for the resolved font style for canvas.
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pub resolved_font_style_response: Option<ServoArc<Font>>,
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/// A queued response for the offset parent/rect of a node.
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pub offset_parent_response: OffsetParentResponse,
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/// Scroll offsets of scrolling regions.
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pub scroll_offsets: ScrollOffsetMap,
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/// Index in a text fragment. We need this do determine the insertion point.
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pub text_index_response: TextIndexResponse,
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/// A queued response for the list of nodes at a given point.
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pub nodes_from_point_response: Vec<UntrustedNodeAddress>,
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/// A queued response for the inner text of a given element.
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pub element_inner_text_response: String,
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/// A queued response for the viewport dimensions for a given browsing context.
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pub inner_window_dimensions_response: Option<TypedSize2D<f32, CSSPixel>>,
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}
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pub struct LayoutRPCImpl(pub Arc<Mutex<LayoutThreadData>>);
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// https://drafts.csswg.org/cssom-view/#overflow-directions
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fn overflow_direction(writing_mode: &WritingMode) -> OverflowDirection {
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match (
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writing_mode.block_flow_direction(),
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writing_mode.inline_base_direction(),
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) {
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(BlockFlowDirection::TopToBottom, InlineBaseDirection::LeftToRight) |
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(BlockFlowDirection::LeftToRight, InlineBaseDirection::LeftToRight) => {
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OverflowDirection::RightAndDown
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},
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(BlockFlowDirection::TopToBottom, InlineBaseDirection::RightToLeft) |
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(BlockFlowDirection::RightToLeft, InlineBaseDirection::LeftToRight) => {
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OverflowDirection::LeftAndDown
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},
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(BlockFlowDirection::RightToLeft, InlineBaseDirection::RightToLeft) => {
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OverflowDirection::LeftAndUp
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},
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(BlockFlowDirection::LeftToRight, InlineBaseDirection::RightToLeft) => {
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OverflowDirection::RightAndUp
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},
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}
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}
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impl LayoutRPC for LayoutRPCImpl {
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// The neat thing here is that in order to answer the following two queries we only
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// need to compare nodes for equality. Thus we can safely work only with `OpaqueNode`.
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fn content_box(&self) -> ContentBoxResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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ContentBoxResponse(rw_data.content_box_response)
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}
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/// Requests the dimensions of all the content boxes, as in the `getClientRects()` call.
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fn content_boxes(&self) -> ContentBoxesResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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ContentBoxesResponse(rw_data.content_boxes_response.clone())
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}
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fn nodes_from_point_response(&self) -> Vec<UntrustedNodeAddress> {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.nodes_from_point_response.clone()
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}
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fn node_geometry(&self) -> NodeGeometryResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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NodeGeometryResponse {
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client_rect: rw_data.client_rect_response,
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}
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}
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fn scrolling_area(&self) -> NodeGeometryResponse {
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NodeGeometryResponse {
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client_rect: self.0.lock().unwrap().scrolling_area_response,
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}
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}
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fn node_scroll_id(&self) -> NodeScrollIdResponse {
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NodeScrollIdResponse(
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self.0
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.lock()
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.unwrap()
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.scroll_id_response
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.expect("scroll id is not correctly fetched"),
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)
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}
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/// Retrieves the resolved value for a CSS style property.
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fn resolved_style(&self) -> ResolvedStyleResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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ResolvedStyleResponse(rw_data.resolved_style_response.clone())
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}
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fn resolved_font_style(&self) -> Option<ServoArc<Font>> {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.resolved_font_style_response.clone()
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}
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fn offset_parent(&self) -> OffsetParentResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.offset_parent_response.clone()
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}
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fn text_index(&self) -> TextIndexResponse {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.text_index_response.clone()
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}
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fn element_inner_text(&self) -> String {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.element_inner_text_response.clone()
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}
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fn inner_window_dimensions(&self) -> Option<TypedSize2D<f32, CSSPixel>> {
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let LayoutRPCImpl(rw_data) = self;
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let rw_data = rw_data.lock().unwrap();
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rw_data.inner_window_dimensions_response
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}
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}
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struct UnioningFragmentBorderBoxIterator {
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node_address: OpaqueNode,
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rect: Option<Rect<Au>>,
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}
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impl UnioningFragmentBorderBoxIterator {
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fn new(node_address: OpaqueNode) -> UnioningFragmentBorderBoxIterator {
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UnioningFragmentBorderBoxIterator {
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node_address,
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rect: None,
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}
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}
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}
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impl FragmentBorderBoxIterator for UnioningFragmentBorderBoxIterator {
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fn process(&mut self, _: &Fragment, _: i32, border_box: &Rect<Au>) {
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self.rect = match self.rect {
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Some(rect) => Some(rect.union(border_box)),
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None => Some(*border_box),
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};
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}
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fn should_process(&mut self, fragment: &Fragment) -> bool {
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fragment.contains_node(self.node_address)
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}
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}
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struct CollectingFragmentBorderBoxIterator {
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node_address: OpaqueNode,
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rects: Vec<Rect<Au>>,
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}
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impl CollectingFragmentBorderBoxIterator {
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fn new(node_address: OpaqueNode) -> CollectingFragmentBorderBoxIterator {
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CollectingFragmentBorderBoxIterator {
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node_address,
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rects: Vec::new(),
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}
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}
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}
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impl FragmentBorderBoxIterator for CollectingFragmentBorderBoxIterator {
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fn process(&mut self, _: &Fragment, _: i32, border_box: &Rect<Au>) {
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self.rects.push(*border_box);
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}
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fn should_process(&mut self, fragment: &Fragment) -> bool {
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fragment.contains_node(self.node_address)
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}
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}
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enum Side {
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Left,
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Right,
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Bottom,
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Top,
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}
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enum MarginPadding {
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Margin,
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Padding,
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}
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enum PositionProperty {
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Left,
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Right,
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Top,
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Bottom,
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Width,
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Height,
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}
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#[derive(Debug)]
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enum OverflowDirection {
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RightAndDown,
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LeftAndDown,
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LeftAndUp,
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RightAndUp,
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}
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struct PositionRetrievingFragmentBorderBoxIterator {
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node_address: OpaqueNode,
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result: Option<Au>,
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position: Point2D<Au>,
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property: PositionProperty,
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}
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impl PositionRetrievingFragmentBorderBoxIterator {
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fn new(
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node_address: OpaqueNode,
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property: PositionProperty,
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position: Point2D<Au>,
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) -> PositionRetrievingFragmentBorderBoxIterator {
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PositionRetrievingFragmentBorderBoxIterator {
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node_address,
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position,
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property,
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result: None,
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}
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}
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}
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impl FragmentBorderBoxIterator for PositionRetrievingFragmentBorderBoxIterator {
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fn process(&mut self, fragment: &Fragment, _: i32, border_box: &Rect<Au>) {
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let border_padding = fragment
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.border_padding
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.to_physical(fragment.style.writing_mode);
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self.result = Some(match self.property {
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PositionProperty::Left => self.position.x,
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PositionProperty::Top => self.position.y,
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PositionProperty::Width => border_box.size.width - border_padding.horizontal(),
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PositionProperty::Height => border_box.size.height - border_padding.vertical(),
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// TODO: the following 2 calculations are completely wrong.
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// They should return the difference between the parent's and this
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// fragment's border boxes.
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PositionProperty::Right => border_box.max_x() + self.position.x,
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PositionProperty::Bottom => border_box.max_y() + self.position.y,
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});
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}
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fn should_process(&mut self, fragment: &Fragment) -> bool {
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fragment.contains_node(self.node_address)
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}
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}
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struct MarginRetrievingFragmentBorderBoxIterator {
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node_address: OpaqueNode,
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result: Option<Au>,
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writing_mode: WritingMode,
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margin_padding: MarginPadding,
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side: Side,
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}
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impl MarginRetrievingFragmentBorderBoxIterator {
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fn new(
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node_address: OpaqueNode,
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side: Side,
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margin_padding: MarginPadding,
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writing_mode: WritingMode,
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) -> MarginRetrievingFragmentBorderBoxIterator {
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MarginRetrievingFragmentBorderBoxIterator {
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node_address,
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side,
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margin_padding,
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result: None,
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writing_mode,
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}
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}
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}
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impl FragmentBorderBoxIterator for MarginRetrievingFragmentBorderBoxIterator {
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fn process(&mut self, fragment: &Fragment, _: i32, _: &Rect<Au>) {
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let rect = match self.margin_padding {
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MarginPadding::Margin => &fragment.margin,
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MarginPadding::Padding => &fragment.border_padding,
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};
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self.result = Some(match self.side {
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Side::Left => rect.left(self.writing_mode),
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Side::Right => rect.right(self.writing_mode),
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Side::Bottom => rect.bottom(self.writing_mode),
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Side::Top => rect.top(self.writing_mode),
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});
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}
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fn should_process(&mut self, fragment: &Fragment) -> bool {
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fragment.contains_node(self.node_address)
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}
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}
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pub fn process_content_box_request(
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requested_node: OpaqueNode,
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layout_root: &mut dyn Flow,
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) -> Option<Rect<Au>> {
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// FIXME(pcwalton): This has not been updated to handle the stacking context relative
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// stuff. So the position is wrong in most cases.
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let mut iterator = UnioningFragmentBorderBoxIterator::new(requested_node);
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sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
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iterator.rect
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}
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pub fn process_content_boxes_request(
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requested_node: OpaqueNode,
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layout_root: &mut dyn Flow,
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) -> Vec<Rect<Au>> {
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// FIXME(pcwalton): This has not been updated to handle the stacking context relative
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// stuff. So the position is wrong in most cases.
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let mut iterator = CollectingFragmentBorderBoxIterator::new(requested_node);
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sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
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iterator.rects
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}
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struct FragmentClientRectQueryIterator {
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node_address: OpaqueNode,
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client_rect: Rect<i32>,
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}
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impl FragmentClientRectQueryIterator {
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fn new(node_address: OpaqueNode) -> FragmentClientRectQueryIterator {
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FragmentClientRectQueryIterator {
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node_address,
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client_rect: Rect::zero(),
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}
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}
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}
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struct UnioningFragmentScrollAreaIterator {
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node_address: OpaqueNode,
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union_rect: Rect<i32>,
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origin_rect: Rect<i32>,
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level: Option<i32>,
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is_child: bool,
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overflow_direction: OverflowDirection,
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}
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impl UnioningFragmentScrollAreaIterator {
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fn new(node_address: OpaqueNode) -> UnioningFragmentScrollAreaIterator {
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UnioningFragmentScrollAreaIterator {
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node_address,
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union_rect: Rect::zero(),
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origin_rect: Rect::zero(),
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level: None,
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is_child: false,
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// FIXME(#20867)
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overflow_direction: OverflowDirection::RightAndDown,
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}
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}
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}
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struct NodeOffsetBoxInfo {
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offset: Point2D<Au>,
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rectangle: Rect<Au>,
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}
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struct ParentBorderBoxInfo {
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node_address: OpaqueNode,
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origin: Point2D<Au>,
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}
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struct ParentOffsetBorderBoxIterator {
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node_address: OpaqueNode,
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has_processed_node: bool,
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node_offset_box: Option<NodeOffsetBoxInfo>,
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parent_nodes: Vec<Option<ParentBorderBoxInfo>>,
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}
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impl ParentOffsetBorderBoxIterator {
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fn new(node_address: OpaqueNode) -> ParentOffsetBorderBoxIterator {
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ParentOffsetBorderBoxIterator {
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node_address,
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has_processed_node: false,
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node_offset_box: None,
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parent_nodes: Vec::new(),
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}
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}
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}
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|
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impl FragmentBorderBoxIterator for FragmentClientRectQueryIterator {
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fn process(&mut self, fragment: &Fragment, _: i32, border_box: &Rect<Au>) {
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let style_structs::Border {
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border_top_width: top_width,
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border_right_width: right_width,
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border_bottom_width: bottom_width,
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border_left_width: left_width,
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..
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} = *fragment.style.get_border();
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let (left_width, right_width) = (left_width.to_px(), right_width.to_px());
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let (top_width, bottom_width) = (top_width.to_px(), bottom_width.to_px());
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self.client_rect.origin.y = top_width;
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self.client_rect.origin.x = left_width;
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self.client_rect.size.width = border_box.size.width.to_px() - left_width - right_width;
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self.client_rect.size.height = border_box.size.height.to_px() - top_width - bottom_width;
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}
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|
fn should_process(&mut self, fragment: &Fragment) -> bool {
|
|
fragment.node == self.node_address
|
|
}
|
|
}
|
|
|
|
// https://drafts.csswg.org/cssom-view/#scrolling-area
|
|
impl FragmentBorderBoxIterator for UnioningFragmentScrollAreaIterator {
|
|
fn process(&mut self, fragment: &Fragment, level: i32, border_box: &Rect<Au>) {
|
|
// In cases in which smaller child elements contain less padding than the parent
|
|
// the a union of the two elements padding rectangles could result in an unwanted
|
|
// increase in size. To work around this, we store the original elements padding
|
|
// rectangle as `origin_rect` and the union of all child elements padding and
|
|
// margin rectangles as `union_rect`.
|
|
let style_structs::Border {
|
|
border_top_width: top_border,
|
|
border_right_width: right_border,
|
|
border_bottom_width: bottom_border,
|
|
border_left_width: left_border,
|
|
..
|
|
} = *fragment.style.get_border();
|
|
let (left_border, right_border) = (left_border.to_px(), right_border.to_px());
|
|
let (top_border, bottom_border) = (top_border.to_px(), bottom_border.to_px());
|
|
let right_padding = border_box.size.width.to_px() - right_border - left_border;
|
|
let bottom_padding = border_box.size.height.to_px() - bottom_border - top_border;
|
|
let top_padding = top_border;
|
|
let left_padding = left_border;
|
|
|
|
match self.level {
|
|
Some(start_level) if level <= start_level => {
|
|
self.is_child = false;
|
|
},
|
|
Some(_) => {
|
|
let padding = Rect::new(
|
|
Point2D::new(left_padding, top_padding),
|
|
Size2D::new(right_padding, bottom_padding),
|
|
);
|
|
let top_margin = fragment.margin.top(fragment.style.writing_mode).to_px();
|
|
let left_margin = fragment.margin.left(fragment.style.writing_mode).to_px();
|
|
let bottom_margin = fragment.margin.bottom(fragment.style.writing_mode).to_px();
|
|
let right_margin = fragment.margin.right(fragment.style.writing_mode).to_px();
|
|
let margin = Rect::new(
|
|
Point2D::new(left_margin, top_margin),
|
|
Size2D::new(right_margin, bottom_margin),
|
|
);
|
|
|
|
// This is a workaround because euclid does not support unioning empty
|
|
// rectangles.
|
|
// TODO: The way that this iterator is calculating scroll area is very
|
|
// suspect and the code below is a workaround until it can be written
|
|
// in a better way.
|
|
self.union_rect = Box2D::new(
|
|
Point2D::new(
|
|
min(
|
|
padding.min_x(),
|
|
min(margin.min_x(), self.union_rect.min_x()),
|
|
),
|
|
min(
|
|
padding.min_y(),
|
|
min(margin.min_y(), self.union_rect.min_y()),
|
|
),
|
|
),
|
|
Point2D::new(
|
|
max(
|
|
padding.max_x(),
|
|
max(margin.max_x(), self.union_rect.max_x()),
|
|
),
|
|
max(
|
|
padding.max_y(),
|
|
max(margin.max_y(), self.union_rect.max_y()),
|
|
),
|
|
),
|
|
)
|
|
.to_rect();
|
|
},
|
|
None => {
|
|
self.level = Some(level);
|
|
self.is_child = true;
|
|
self.overflow_direction = overflow_direction(&fragment.style.writing_mode);
|
|
self.origin_rect = Rect::new(
|
|
Point2D::new(left_padding, top_padding),
|
|
Size2D::new(right_padding, bottom_padding),
|
|
);
|
|
},
|
|
};
|
|
}
|
|
|
|
fn should_process(&mut self, fragment: &Fragment) -> bool {
|
|
fragment.contains_node(self.node_address) || self.is_child
|
|
}
|
|
}
|
|
|
|
// https://drafts.csswg.org/cssom-view/#extensions-to-the-htmlelement-interface
|
|
impl FragmentBorderBoxIterator for ParentOffsetBorderBoxIterator {
|
|
fn process(&mut self, fragment: &Fragment, level: i32, border_box: &Rect<Au>) {
|
|
if self.node_offset_box.is_none() {
|
|
// We haven't found the node yet, so we're still looking
|
|
// for its parent. Remove all nodes at this level or
|
|
// higher, as they can't be parents of this node.
|
|
self.parent_nodes.truncate(level as usize);
|
|
assert_eq!(
|
|
self.parent_nodes.len(),
|
|
level as usize,
|
|
"Skipped at least one level in the flow tree!"
|
|
);
|
|
}
|
|
|
|
if !fragment.is_primary_fragment() {
|
|
// This fragment doesn't correspond to anything worth
|
|
// taking measurements from.
|
|
|
|
if self.node_offset_box.is_none() {
|
|
// If this is the only fragment in the flow, we need to
|
|
// do this to avoid failing the above assertion.
|
|
self.parent_nodes.push(None);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
if fragment.node == self.node_address {
|
|
// Found the fragment in the flow tree that matches the
|
|
// DOM node being looked for.
|
|
|
|
assert!(
|
|
self.node_offset_box.is_none(),
|
|
"Node was being treated as inline, but it has an associated fragment!"
|
|
);
|
|
|
|
self.has_processed_node = true;
|
|
self.node_offset_box = Some(NodeOffsetBoxInfo {
|
|
offset: border_box.origin,
|
|
rectangle: *border_box,
|
|
});
|
|
|
|
// offsetParent returns null if the node is fixed.
|
|
if fragment.style.get_box().position == Position::Fixed {
|
|
self.parent_nodes.clear();
|
|
}
|
|
} else if let Some(node) = fragment.inline_context.as_ref().and_then(|inline_context| {
|
|
inline_context
|
|
.nodes
|
|
.iter()
|
|
.find(|node| node.address == self.node_address)
|
|
}) {
|
|
// TODO: Handle cases where the `offsetParent` is an inline
|
|
// element. This will likely be impossible until
|
|
// https://github.com/servo/servo/issues/13982 is fixed.
|
|
|
|
// Found a fragment in the flow tree whose inline context
|
|
// contains the DOM node we're looking for, i.e. the node
|
|
// is inline and contains this fragment.
|
|
match self.node_offset_box {
|
|
Some(NodeOffsetBoxInfo {
|
|
ref mut rectangle, ..
|
|
}) => {
|
|
*rectangle = rectangle.union(border_box);
|
|
},
|
|
None => {
|
|
// https://github.com/servo/servo/issues/13982 will
|
|
// cause this assertion to fail sometimes, so it's
|
|
// commented out for now.
|
|
/*assert!(node.flags.contains(FIRST_FRAGMENT_OF_ELEMENT),
|
|
"First fragment of inline node found wasn't its first fragment!");*/
|
|
|
|
self.node_offset_box = Some(NodeOffsetBoxInfo {
|
|
offset: border_box.origin,
|
|
rectangle: *border_box,
|
|
});
|
|
},
|
|
}
|
|
|
|
if node
|
|
.flags
|
|
.contains(InlineFragmentNodeFlags::LAST_FRAGMENT_OF_ELEMENT)
|
|
{
|
|
self.has_processed_node = true;
|
|
}
|
|
} else if self.node_offset_box.is_none() {
|
|
let is_body_element = fragment
|
|
.flags
|
|
.contains(FragmentFlags::IS_BODY_ELEMENT_OF_HTML_ELEMENT_ROOT);
|
|
let is_valid_parent = match (
|
|
is_body_element,
|
|
fragment.style.get_box().position,
|
|
&fragment.specific,
|
|
) {
|
|
// Spec says it's valid if any of these are true:
|
|
// 1) Is the body element
|
|
// 2) Is static position *and* is a table or table cell
|
|
// 3) Is not static position
|
|
(true, _, _) |
|
|
(false, Position::Static, &SpecificFragmentInfo::Table) |
|
|
(false, Position::Static, &SpecificFragmentInfo::TableCell) |
|
|
(false, Position::Sticky, _) |
|
|
(false, Position::Absolute, _) |
|
|
(false, Position::Relative, _) |
|
|
(false, Position::Fixed, _) => true,
|
|
|
|
// Otherwise, it's not a valid parent
|
|
(false, Position::Static, _) => false,
|
|
};
|
|
|
|
let parent_info = if is_valid_parent {
|
|
let border_width = fragment
|
|
.border_width()
|
|
.to_physical(fragment.style.writing_mode);
|
|
|
|
Some(ParentBorderBoxInfo {
|
|
node_address: fragment.node,
|
|
origin: border_box.origin + Vector2D::new(border_width.left, border_width.top),
|
|
})
|
|
} else {
|
|
None
|
|
};
|
|
|
|
self.parent_nodes.push(parent_info);
|
|
}
|
|
}
|
|
|
|
fn should_process(&mut self, _: &Fragment) -> bool {
|
|
!self.has_processed_node
|
|
}
|
|
}
|
|
|
|
pub fn process_client_rect_query(
|
|
requested_node: OpaqueNode,
|
|
layout_root: &mut dyn Flow,
|
|
) -> Rect<i32> {
|
|
let mut iterator = FragmentClientRectQueryIterator::new(requested_node);
|
|
sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
|
|
iterator.client_rect
|
|
}
|
|
|
|
pub fn process_node_scroll_id_request<'dom>(
|
|
id: PipelineId,
|
|
requested_node: impl LayoutNode<'dom>,
|
|
) -> ExternalScrollId {
|
|
let layout_node = requested_node.to_threadsafe();
|
|
layout_node.generate_scroll_id(id)
|
|
}
|
|
|
|
/// <https://drafts.csswg.org/cssom-view/#scrolling-area>
|
|
pub fn process_scrolling_area_request(
|
|
requested_node: Option<OpaqueNode>,
|
|
layout_root: &mut dyn Flow,
|
|
) -> Rect<i32> {
|
|
let requested_node = match requested_node {
|
|
Some(node) => node,
|
|
None => {
|
|
let rect = layout_root.base().overflow.scroll;
|
|
return Rect::new(
|
|
Point2D::new(rect.origin.x.to_nearest_px(), rect.origin.y.to_nearest_px()),
|
|
Size2D::new(rect.width().ceil_to_px(), rect.height().ceil_to_px()),
|
|
);
|
|
},
|
|
};
|
|
|
|
let mut iterator = UnioningFragmentScrollAreaIterator::new(requested_node);
|
|
sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
|
|
match iterator.overflow_direction {
|
|
OverflowDirection::RightAndDown => {
|
|
let right = max(
|
|
iterator.union_rect.size.width,
|
|
iterator.origin_rect.size.width,
|
|
);
|
|
let bottom = max(
|
|
iterator.union_rect.size.height,
|
|
iterator.origin_rect.size.height,
|
|
);
|
|
Rect::new(iterator.origin_rect.origin, Size2D::new(right, bottom))
|
|
},
|
|
OverflowDirection::LeftAndDown => {
|
|
let bottom = max(
|
|
iterator.union_rect.size.height,
|
|
iterator.origin_rect.size.height,
|
|
);
|
|
let left = min(iterator.union_rect.origin.x, iterator.origin_rect.origin.x);
|
|
Rect::new(
|
|
Point2D::new(left, iterator.origin_rect.origin.y),
|
|
Size2D::new(iterator.origin_rect.size.width, bottom),
|
|
)
|
|
},
|
|
OverflowDirection::LeftAndUp => {
|
|
let top = min(iterator.union_rect.origin.y, iterator.origin_rect.origin.y);
|
|
let left = min(iterator.union_rect.origin.x, iterator.origin_rect.origin.x);
|
|
Rect::new(Point2D::new(left, top), iterator.origin_rect.size)
|
|
},
|
|
OverflowDirection::RightAndUp => {
|
|
let top = min(iterator.union_rect.origin.y, iterator.origin_rect.origin.y);
|
|
let right = max(
|
|
iterator.union_rect.size.width,
|
|
iterator.origin_rect.size.width,
|
|
);
|
|
Rect::new(
|
|
Point2D::new(iterator.origin_rect.origin.x, top),
|
|
Size2D::new(right, iterator.origin_rect.size.height),
|
|
)
|
|
},
|
|
}
|
|
}
|
|
|
|
fn create_font_declaration(
|
|
value: &str,
|
|
property: &PropertyId,
|
|
url_data: &ServoUrl,
|
|
quirks_mode: QuirksMode,
|
|
) -> Option<PropertyDeclarationBlock> {
|
|
let mut declarations = SourcePropertyDeclaration::default();
|
|
let result = parse_one_declaration_into(
|
|
&mut declarations,
|
|
property.clone(),
|
|
value,
|
|
Origin::Author,
|
|
&UrlExtraData(url_data.get_arc()),
|
|
None,
|
|
ParsingMode::DEFAULT,
|
|
quirks_mode,
|
|
CssRuleType::Style,
|
|
);
|
|
let declarations = match result {
|
|
Ok(()) => {
|
|
let mut block = PropertyDeclarationBlock::new();
|
|
block.extend(declarations.drain(), Importance::Normal);
|
|
block
|
|
},
|
|
Err(_) => return None,
|
|
};
|
|
// TODO: Force to set line-height property to 'normal' font property.
|
|
Some(declarations)
|
|
}
|
|
|
|
fn resolve_for_declarations<'dom, E>(
|
|
context: &SharedStyleContext,
|
|
parent_style: Option<&ComputedValues>,
|
|
declarations: PropertyDeclarationBlock,
|
|
shared_lock: &SharedRwLock,
|
|
) -> ServoArc<ComputedValues>
|
|
where
|
|
E: LayoutNode<'dom>,
|
|
{
|
|
let parent_style = match parent_style {
|
|
Some(parent) => parent,
|
|
None => context.stylist.device().default_computed_values(),
|
|
};
|
|
context
|
|
.stylist
|
|
.compute_for_declarations::<E::ConcreteElement>(
|
|
&context.guards,
|
|
parent_style,
|
|
ServoArc::new(shared_lock.wrap(declarations)),
|
|
)
|
|
}
|
|
|
|
pub fn process_resolved_font_style_request<'dom, E>(
|
|
context: &LayoutContext,
|
|
node: E,
|
|
value: &str,
|
|
property: &PropertyId,
|
|
url_data: ServoUrl,
|
|
shared_lock: &SharedRwLock,
|
|
) -> Option<ServoArc<Font>>
|
|
where
|
|
E: LayoutNode<'dom>,
|
|
{
|
|
use style::stylist::RuleInclusion;
|
|
use style::traversal::resolve_style;
|
|
|
|
// 1. Parse the given font property value
|
|
let quirks_mode = context.style_context.quirks_mode();
|
|
let declarations = create_font_declaration(value, property, &url_data, quirks_mode)?;
|
|
|
|
// TODO: Reject 'inherit' and 'initial' values for the font property.
|
|
|
|
// 2. Get resolved styles for the parent element
|
|
let element = node.as_element().unwrap();
|
|
let parent_style = if node.is_connected() {
|
|
if element.has_data() {
|
|
node.to_threadsafe().as_element().unwrap().resolved_style()
|
|
} else {
|
|
let mut tlc = ThreadLocalStyleContext::new();
|
|
let mut context = StyleContext {
|
|
shared: &context.style_context,
|
|
thread_local: &mut tlc,
|
|
};
|
|
let styles = resolve_style(&mut context, element, RuleInclusion::All, None, None);
|
|
styles.primary().clone()
|
|
}
|
|
} else {
|
|
let default_declarations =
|
|
create_font_declaration("10px sans-serif", property, &url_data, quirks_mode).unwrap();
|
|
resolve_for_declarations::<E>(
|
|
&context.style_context,
|
|
None,
|
|
default_declarations,
|
|
shared_lock,
|
|
)
|
|
};
|
|
|
|
// 3. Resolve the parsed value with resolved styles of the parent element
|
|
let computed_values = resolve_for_declarations::<E>(
|
|
&context.style_context,
|
|
Some(&*parent_style),
|
|
declarations,
|
|
shared_lock,
|
|
);
|
|
|
|
Some(computed_values.clone_font())
|
|
}
|
|
|
|
/// Return the resolved value of property for a given (pseudo)element.
|
|
/// <https://drafts.csswg.org/cssom/#resolved-value>
|
|
pub fn process_resolved_style_request<'dom>(
|
|
context: &LayoutContext,
|
|
node: impl LayoutNode<'dom>,
|
|
pseudo: &Option<PseudoElement>,
|
|
property: &PropertyId,
|
|
layout_root: &mut dyn Flow,
|
|
) -> String {
|
|
use style::stylist::RuleInclusion;
|
|
use style::traversal::resolve_style;
|
|
|
|
let element = node.as_element().unwrap();
|
|
|
|
// We call process_resolved_style_request after performing a whole-document
|
|
// traversal, so in the common case, the element is styled.
|
|
if element.has_data() {
|
|
return process_resolved_style_request_internal(node, pseudo, property, layout_root);
|
|
}
|
|
|
|
// In a display: none subtree. No pseudo-element exists.
|
|
if pseudo.is_some() {
|
|
return String::new();
|
|
}
|
|
|
|
let mut tlc = ThreadLocalStyleContext::new();
|
|
let mut context = StyleContext {
|
|
shared: &context.style_context,
|
|
thread_local: &mut tlc,
|
|
};
|
|
|
|
let styles = resolve_style(
|
|
&mut context,
|
|
element,
|
|
RuleInclusion::All,
|
|
pseudo.as_ref(),
|
|
None,
|
|
);
|
|
let style = styles.primary();
|
|
let longhand_id = match *property {
|
|
PropertyId::LonghandAlias(id, _) | PropertyId::Longhand(id) => id,
|
|
// Firefox returns blank strings for the computed value of shorthands,
|
|
// so this should be web-compatible.
|
|
PropertyId::ShorthandAlias(..) | PropertyId::Shorthand(_) => return String::new(),
|
|
PropertyId::Custom(ref name) => {
|
|
return style.computed_value_to_string(PropertyDeclarationId::Custom(name));
|
|
},
|
|
};
|
|
|
|
// No need to care about used values here, since we're on a display: none
|
|
// subtree, use the resolved value.
|
|
style.computed_value_to_string(PropertyDeclarationId::Longhand(longhand_id))
|
|
}
|
|
|
|
/// The primary resolution logic, which assumes that the element is styled.
|
|
fn process_resolved_style_request_internal<'dom>(
|
|
requested_node: impl LayoutNode<'dom>,
|
|
pseudo: &Option<PseudoElement>,
|
|
property: &PropertyId,
|
|
layout_root: &mut dyn Flow,
|
|
) -> String {
|
|
let layout_el = requested_node.to_threadsafe().as_element().unwrap();
|
|
let layout_el = match *pseudo {
|
|
Some(PseudoElement::Before) => layout_el.get_before_pseudo(),
|
|
Some(PseudoElement::After) => layout_el.get_after_pseudo(),
|
|
Some(PseudoElement::DetailsSummary) |
|
|
Some(PseudoElement::DetailsContent) |
|
|
Some(PseudoElement::Selection) => None,
|
|
// FIXME(emilio): What about the other pseudos? Probably they shouldn't
|
|
// just return the element's style!
|
|
_ => Some(layout_el),
|
|
};
|
|
|
|
let layout_el = match layout_el {
|
|
None => {
|
|
// The pseudo doesn't exist, return nothing. Chrome seems to query
|
|
// the element itself in this case, Firefox uses the resolved value.
|
|
// https://www.w3.org/Bugs/Public/show_bug.cgi?id=29006
|
|
return String::new();
|
|
},
|
|
Some(layout_el) => layout_el,
|
|
};
|
|
|
|
let style = &*layout_el.resolved_style();
|
|
let longhand_id = match *property {
|
|
PropertyId::LonghandAlias(id, _) | PropertyId::Longhand(id) => id,
|
|
// Firefox returns blank strings for the computed value of shorthands,
|
|
// so this should be web-compatible.
|
|
PropertyId::ShorthandAlias(..) | PropertyId::Shorthand(_) => return String::new(),
|
|
PropertyId::Custom(ref name) => {
|
|
return style.computed_value_to_string(PropertyDeclarationId::Custom(name));
|
|
},
|
|
};
|
|
|
|
let positioned = match style.get_box().position {
|
|
Position::Relative | Position::Sticky | Position::Fixed | Position::Absolute => true,
|
|
_ => false,
|
|
};
|
|
|
|
//TODO: determine whether requested property applies to the element.
|
|
// eg. width does not apply to non-replaced inline elements.
|
|
// Existing browsers disagree about when left/top/right/bottom apply
|
|
// (Chrome seems to think they never apply and always returns resolved values).
|
|
// There are probably other quirks.
|
|
let applies = true;
|
|
|
|
fn used_value_for_position_property<'dom, N>(
|
|
layout_el: <N::ConcreteThreadSafeLayoutNode as ThreadSafeLayoutNode<'dom>>::ConcreteThreadSafeLayoutElement,
|
|
layout_root: &mut dyn Flow,
|
|
requested_node: N,
|
|
longhand_id: LonghandId,
|
|
) -> String
|
|
where
|
|
N: LayoutNode<'dom>,
|
|
{
|
|
let maybe_data = layout_el.borrow_layout_data();
|
|
let position = maybe_data.map_or(Point2D::zero(), |data| {
|
|
match data.flow_construction_result {
|
|
ConstructionResult::Flow(ref flow_ref, _) => flow_ref
|
|
.deref()
|
|
.base()
|
|
.stacking_relative_position
|
|
.to_point(),
|
|
// TODO(dzbarsky) search parents until we find node with a flow ref.
|
|
// https://github.com/servo/servo/issues/8307
|
|
_ => Point2D::zero(),
|
|
}
|
|
});
|
|
let property = match longhand_id {
|
|
LonghandId::Bottom => PositionProperty::Bottom,
|
|
LonghandId::Top => PositionProperty::Top,
|
|
LonghandId::Left => PositionProperty::Left,
|
|
LonghandId::Right => PositionProperty::Right,
|
|
LonghandId::Width => PositionProperty::Width,
|
|
LonghandId::Height => PositionProperty::Height,
|
|
_ => unreachable!(),
|
|
};
|
|
let mut iterator = PositionRetrievingFragmentBorderBoxIterator::new(
|
|
requested_node.opaque(),
|
|
property,
|
|
position,
|
|
);
|
|
sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
|
|
iterator
|
|
.result
|
|
.map(|r| r.to_css_string())
|
|
.unwrap_or_default()
|
|
}
|
|
|
|
// TODO: we will return neither the computed nor used value for margin and padding.
|
|
match longhand_id {
|
|
LonghandId::MarginBottom |
|
|
LonghandId::MarginTop |
|
|
LonghandId::MarginLeft |
|
|
LonghandId::MarginRight |
|
|
LonghandId::PaddingBottom |
|
|
LonghandId::PaddingTop |
|
|
LonghandId::PaddingLeft |
|
|
LonghandId::PaddingRight
|
|
if applies && style.get_box().display != Display::None =>
|
|
{
|
|
let (margin_padding, side) = match longhand_id {
|
|
LonghandId::MarginBottom => (MarginPadding::Margin, Side::Bottom),
|
|
LonghandId::MarginTop => (MarginPadding::Margin, Side::Top),
|
|
LonghandId::MarginLeft => (MarginPadding::Margin, Side::Left),
|
|
LonghandId::MarginRight => (MarginPadding::Margin, Side::Right),
|
|
LonghandId::PaddingBottom => (MarginPadding::Padding, Side::Bottom),
|
|
LonghandId::PaddingTop => (MarginPadding::Padding, Side::Top),
|
|
LonghandId::PaddingLeft => (MarginPadding::Padding, Side::Left),
|
|
LonghandId::PaddingRight => (MarginPadding::Padding, Side::Right),
|
|
_ => unreachable!(),
|
|
};
|
|
let mut iterator = MarginRetrievingFragmentBorderBoxIterator::new(
|
|
requested_node.opaque(),
|
|
side,
|
|
margin_padding,
|
|
style.writing_mode,
|
|
);
|
|
sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
|
|
iterator
|
|
.result
|
|
.map(|r| r.to_css_string())
|
|
.unwrap_or_default()
|
|
},
|
|
|
|
LonghandId::Bottom | LonghandId::Top | LonghandId::Right | LonghandId::Left
|
|
if applies && positioned && style.get_box().display != Display::None =>
|
|
{
|
|
used_value_for_position_property(layout_el, layout_root, requested_node, longhand_id)
|
|
},
|
|
LonghandId::Width | LonghandId::Height
|
|
if applies && style.get_box().display != Display::None =>
|
|
{
|
|
used_value_for_position_property(layout_el, layout_root, requested_node, longhand_id)
|
|
},
|
|
// FIXME: implement used value computation for line-height
|
|
_ => style.computed_value_to_string(PropertyDeclarationId::Longhand(longhand_id)),
|
|
}
|
|
}
|
|
|
|
pub fn process_offset_parent_query(
|
|
requested_node: OpaqueNode,
|
|
layout_root: &mut dyn Flow,
|
|
) -> OffsetParentResponse {
|
|
let mut iterator = ParentOffsetBorderBoxIterator::new(requested_node);
|
|
sequential::iterate_through_flow_tree_fragment_border_boxes(layout_root, &mut iterator);
|
|
|
|
let node_offset_box = iterator.node_offset_box;
|
|
let parent_info = iterator.parent_nodes.into_iter().rev().flatten().next();
|
|
match (node_offset_box, parent_info) {
|
|
(Some(node_offset_box), Some(parent_info)) => {
|
|
let origin = node_offset_box.offset - parent_info.origin.to_vector();
|
|
let size = node_offset_box.rectangle.size;
|
|
OffsetParentResponse {
|
|
node_address: Some(parent_info.node_address.into()),
|
|
rect: Rect::new(origin, size),
|
|
}
|
|
},
|
|
_ => OffsetParentResponse::empty(),
|
|
}
|
|
}
|
|
|
|
enum InnerTextItem {
|
|
Text(String),
|
|
RequiredLineBreakCount(u32),
|
|
}
|
|
|
|
// https://html.spec.whatwg.org/multipage/#the-innertext-idl-attribute
|
|
pub fn process_element_inner_text_query<'dom>(
|
|
node: impl LayoutNode<'dom>,
|
|
indexable_text: &IndexableText,
|
|
) -> String {
|
|
// Step 1.
|
|
let mut results = Vec::new();
|
|
// Step 2.
|
|
inner_text_collection_steps(node, indexable_text, &mut results);
|
|
let mut max_req_line_break_count = 0;
|
|
let mut inner_text = Vec::new();
|
|
for item in results {
|
|
match item {
|
|
InnerTextItem::Text(s) => {
|
|
if max_req_line_break_count > 0 {
|
|
// Step 5.
|
|
for _ in 0..max_req_line_break_count {
|
|
inner_text.push("\u{000A}".to_owned());
|
|
}
|
|
max_req_line_break_count = 0;
|
|
}
|
|
// Step 3.
|
|
if !s.is_empty() {
|
|
inner_text.push(s.to_owned());
|
|
}
|
|
},
|
|
InnerTextItem::RequiredLineBreakCount(count) => {
|
|
// Step 4.
|
|
if inner_text.is_empty() {
|
|
// Remove required line break count at the start.
|
|
continue;
|
|
}
|
|
// Store the count if it's the max of this run,
|
|
// but it may be ignored if no text item is found afterwards,
|
|
// which means that these are consecutive line breaks at the end.
|
|
if count > max_req_line_break_count {
|
|
max_req_line_break_count = count;
|
|
}
|
|
},
|
|
}
|
|
}
|
|
inner_text.into_iter().collect()
|
|
}
|
|
|
|
// https://html.spec.whatwg.org/multipage/#inner-text-collection-steps
|
|
#[allow(unsafe_code)]
|
|
fn inner_text_collection_steps<'dom>(
|
|
node: impl LayoutNode<'dom>,
|
|
indexable_text: &IndexableText,
|
|
results: &mut Vec<InnerTextItem>,
|
|
) {
|
|
let mut items = Vec::new();
|
|
for child in node.traverse_preorder() {
|
|
let node = match child.type_id() {
|
|
LayoutNodeType::Text => child.parent_node().unwrap(),
|
|
_ => child,
|
|
};
|
|
|
|
let element_data = match node.get_style_and_opaque_layout_data() {
|
|
Some(data) => &data.style_data.element_data,
|
|
None => continue,
|
|
};
|
|
|
|
let style = match element_data.borrow().styles.get_primary() {
|
|
None => continue,
|
|
Some(style) => style.clone(),
|
|
};
|
|
|
|
// Step 2.
|
|
if style.get_inherited_box().visibility != Visibility::Visible {
|
|
continue;
|
|
}
|
|
|
|
// Step 3.
|
|
let display = style.get_box().display;
|
|
if !child.is_connected() || display == Display::None {
|
|
continue;
|
|
}
|
|
|
|
match child.type_id() {
|
|
LayoutNodeType::Text => {
|
|
// Step 4.
|
|
if let Some(text_content) = indexable_text.get(child.opaque()) {
|
|
for content in text_content {
|
|
items.push(InnerTextItem::Text(content.text_run.text.to_string()));
|
|
}
|
|
}
|
|
},
|
|
LayoutNodeType::Element(LayoutElementType::HTMLBRElement) => {
|
|
// Step 5.
|
|
items.push(InnerTextItem::Text(String::from(
|
|
"\u{000A}", /* line feed */
|
|
)));
|
|
},
|
|
LayoutNodeType::Element(LayoutElementType::HTMLParagraphElement) => {
|
|
// Step 8.
|
|
items.insert(0, InnerTextItem::RequiredLineBreakCount(2));
|
|
items.push(InnerTextItem::RequiredLineBreakCount(2));
|
|
},
|
|
_ => {},
|
|
}
|
|
|
|
match display {
|
|
Display::TableCell if !is_last_table_cell() => {
|
|
// Step 6.
|
|
items.push(InnerTextItem::Text(String::from("\u{0009}" /* tab */)));
|
|
},
|
|
Display::TableRow if !is_last_table_row() => {
|
|
// Step 7.
|
|
items.push(InnerTextItem::Text(String::from(
|
|
"\u{000A}", /* line feed */
|
|
)));
|
|
},
|
|
Display::Block | Display::Flex | Display::TableCaption | Display::Table => {
|
|
// Step 9.
|
|
items.insert(0, InnerTextItem::RequiredLineBreakCount(1));
|
|
items.push(InnerTextItem::RequiredLineBreakCount(1));
|
|
},
|
|
_ => {},
|
|
}
|
|
}
|
|
|
|
results.append(&mut items);
|
|
}
|
|
|
|
fn is_last_table_cell() -> bool {
|
|
// FIXME(ferjm) Implement this.
|
|
false
|
|
}
|
|
|
|
fn is_last_table_row() -> bool {
|
|
// FIXME(ferjm) Implement this.
|
|
false
|
|
}
|