mirror of
https://github.com/mozilla/gecko-dev.git
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6e5f74d476
See individual commits for details. r? @jdm Source-Repo: https://github.com/servo/servo Source-Revision: ba59ee662752891f9f9b452c1f4b847fad9f64ac
1634 lines
73 KiB
Rust
1634 lines
73 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 http://mozilla.org/MPL/2.0/. */
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//! The layout thread. Performs layout on the DOM, builds display lists and sends them to be
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//! painted.
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#![feature(box_syntax)]
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#![feature(mpsc_select)]
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#![feature(plugin)]
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#![plugin(plugins)]
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extern crate app_units;
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extern crate core;
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extern crate euclid;
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extern crate fnv;
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extern crate gfx;
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extern crate gfx_traits;
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extern crate heapsize;
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#[macro_use] extern crate heapsize_derive;
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extern crate ipc_channel;
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#[macro_use]
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extern crate layout;
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extern crate layout_traits;
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#[allow(unused_extern_crates)]
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#[macro_use]
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extern crate lazy_static;
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#[macro_use]
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extern crate log;
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extern crate msg;
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extern crate net_traits;
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extern crate parking_lot;
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#[macro_use]
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extern crate profile_traits;
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extern crate rayon;
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extern crate script;
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extern crate script_layout_interface;
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extern crate script_traits;
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extern crate selectors;
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extern crate serde_json;
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extern crate servo_config;
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extern crate servo_geometry;
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extern crate servo_url;
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extern crate style;
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extern crate webrender_traits;
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use app_units::Au;
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use euclid::point::Point2D;
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use euclid::rect::Rect;
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use euclid::scale_factor::ScaleFactor;
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use euclid::size::Size2D;
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use fnv::FnvHasher;
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use gfx::display_list::{ClippingRegion, OpaqueNode};
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use gfx::display_list::WebRenderImageInfo;
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use gfx::font;
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use gfx::font_cache_thread::FontCacheThread;
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use gfx::font_context;
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use gfx_traits::{Epoch, FragmentType, ScrollRootId};
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use heapsize::HeapSizeOf;
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use ipc_channel::ipc::{self, IpcReceiver, IpcSender};
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use ipc_channel::router::ROUTER;
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use layout::animation;
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use layout::construct::ConstructionResult;
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use layout::context::{LayoutContext, SharedLayoutContext};
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use layout::context::heap_size_of_persistent_local_context;
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use layout::display_list_builder::ToGfxColor;
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use layout::flow::{self, Flow, ImmutableFlowUtils, MutableFlowUtils, MutableOwnedFlowUtils};
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use layout::flow_ref::FlowRef;
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use layout::incremental::{LayoutDamageComputation, REFLOW_ENTIRE_DOCUMENT};
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use layout::layout_debug;
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use layout::parallel;
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use layout::query::{LayoutRPCImpl, LayoutThreadData, process_content_box_request, process_content_boxes_request};
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use layout::query::{process_margin_style_query, process_node_overflow_request, process_resolved_style_request};
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use layout::query::{process_node_geometry_request, process_node_scroll_area_request};
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use layout::query::{process_node_scroll_root_id_request, process_offset_parent_query};
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use layout::sequential;
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use layout::traversal::{ComputeAbsolutePositions, RecalcStyleAndConstructFlows};
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use layout::webrender_helpers::WebRenderDisplayListConverter;
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use layout::wrapper::LayoutNodeLayoutData;
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use layout::wrapper::drop_style_and_layout_data;
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use layout_traits::LayoutThreadFactory;
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use msg::constellation_msg::{FrameId, PipelineId};
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use net_traits::image_cache_thread::{ImageCacheChan, ImageCacheResult, ImageCacheThread};
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use net_traits::image_cache_thread::UsePlaceholder;
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use parking_lot::RwLock;
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use profile_traits::mem::{self, Report, ReportKind, ReportsChan};
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use profile_traits::time::{self, TimerMetadata, profile};
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use profile_traits::time::{TimerMetadataFrameType, TimerMetadataReflowType};
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use script::layout_wrapper::{ServoLayoutElement, ServoLayoutDocument, ServoLayoutNode};
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use script_layout_interface::message::{Msg, NewLayoutThreadInfo, Reflow, ReflowQueryType, ScriptReflow};
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use script_layout_interface::reporter::CSSErrorReporter;
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use script_layout_interface::rpc::{LayoutRPC, MarginStyleResponse, NodeOverflowResponse, OffsetParentResponse};
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use script_layout_interface::rpc::TextIndexResponse;
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use script_layout_interface::wrapper_traits::LayoutNode;
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use script_traits::{ConstellationControlMsg, LayoutControlMsg, LayoutMsg as ConstellationMsg};
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use script_traits::{StackingContextScrollState, UntrustedNodeAddress};
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use selectors::Element;
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use servo_config::opts;
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use servo_config::prefs::PREFS;
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use servo_config::resource_files::read_resource_file;
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use servo_geometry::max_rect;
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use servo_url::ServoUrl;
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use std::borrow::ToOwned;
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use std::collections::HashMap;
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use std::hash::BuildHasherDefault;
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use std::ops::{Deref, DerefMut};
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use std::process;
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use std::sync::{Arc, Mutex, MutexGuard};
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use std::sync::atomic::{AtomicUsize, Ordering};
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use std::sync::mpsc::{Receiver, Sender, channel};
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use std::thread;
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use style::animation::Animation;
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use style::context::{QuirksMode, ReflowGoal, SharedStyleContext, ThreadLocalStyleContextCreationInfo};
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use style::data::StoredRestyleHint;
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use style::dom::{ShowSubtree, ShowSubtreeDataAndPrimaryValues, TElement, TNode};
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use style::error_reporting::{ParseErrorReporter, StdoutErrorReporter};
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use style::logical_geometry::LogicalPoint;
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use style::media_queries::{Device, MediaType};
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use style::parser::ParserContextExtraData;
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use style::properties::ComputedValues;
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use style::servo::restyle_damage::{REFLOW, REFLOW_OUT_OF_FLOW, REPAINT, REPOSITION, STORE_OVERFLOW};
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use style::stylesheets::{Origin, Stylesheet, UserAgentStylesheets};
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use style::stylist::Stylist;
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use style::thread_state;
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use style::timer::Timer;
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use style::traversal::DomTraversal;
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/// Information needed by the layout thread.
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pub struct LayoutThread {
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/// The ID of the pipeline that we belong to.
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id: PipelineId,
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/// The URL of the pipeline that we belong to.
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url: ServoUrl,
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/// Is the current reflow of an iframe, as opposed to a root window?
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is_iframe: bool,
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/// The port on which we receive messages from the script thread.
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port: Receiver<Msg>,
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/// The port on which we receive messages from the constellation.
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pipeline_port: Receiver<LayoutControlMsg>,
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/// The port on which we receive messages from the image cache
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image_cache_receiver: Receiver<ImageCacheResult>,
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/// The channel on which the image cache can send messages to ourself.
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image_cache_sender: ImageCacheChan,
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/// The port on which we receive messages from the font cache thread.
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font_cache_receiver: Receiver<()>,
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/// The channel on which the font cache can send messages to us.
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font_cache_sender: IpcSender<()>,
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/// The channel on which messages can be sent to the constellation.
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constellation_chan: IpcSender<ConstellationMsg>,
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/// The channel on which messages can be sent to the script thread.
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script_chan: IpcSender<ConstellationControlMsg>,
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/// The channel on which messages can be sent to the time profiler.
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time_profiler_chan: time::ProfilerChan,
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/// The channel on which messages can be sent to the memory profiler.
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mem_profiler_chan: mem::ProfilerChan,
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/// The channel on which messages can be sent to the image cache.
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image_cache_thread: ImageCacheThread,
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/// Public interface to the font cache thread.
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font_cache_thread: FontCacheThread,
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/// Is this the first reflow in this LayoutThread?
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first_reflow: bool,
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/// The workers that we use for parallel operation.
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parallel_traversal: Option<rayon::ThreadPool>,
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/// Flag to indicate whether to use parallel operations
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parallel_flag: bool,
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/// Starts at zero, and increased by one every time a layout completes.
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/// This can be used to easily check for invalid stale data.
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generation: u32,
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/// A channel on which new animations that have been triggered by style recalculation can be
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/// sent.
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new_animations_sender: Sender<Animation>,
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/// Receives newly-discovered animations.
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new_animations_receiver: Receiver<Animation>,
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/// The number of Web fonts that have been requested but not yet loaded.
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outstanding_web_fonts: Arc<AtomicUsize>,
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/// The root of the flow tree.
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root_flow: Option<FlowRef>,
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/// The list of currently-running animations.
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running_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
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/// The list of animations that have expired since the last style recalculation.
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expired_animations: Arc<RwLock<HashMap<OpaqueNode, Vec<Animation>>>>,
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/// A counter for epoch messages
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epoch: Epoch,
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/// The size of the viewport. This may be different from the size of the screen due to viewport
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/// constraints.
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viewport_size: Size2D<Au>,
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/// A mutex to allow for fast, read-only RPC of layout's internal data
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/// structures, while still letting the LayoutThread modify them.
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///
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/// All the other elements of this struct are read-only.
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rw_data: Arc<Mutex<LayoutThreadData>>,
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/// The CSS error reporter for all CSS loaded in this layout thread
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error_reporter: CSSErrorReporter,
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webrender_image_cache: Arc<RwLock<HashMap<(ServoUrl, UsePlaceholder),
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WebRenderImageInfo,
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BuildHasherDefault<FnvHasher>>>>,
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// Webrender interface.
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webrender_api: webrender_traits::RenderApi,
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/// The timer object to control the timing of the animations. This should
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/// only be a test-mode timer during testing for animations.
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timer: Timer,
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// Number of layout threads. This is copied from `servo_config::opts`, but we'd
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// rather limit the dependency on that module here.
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layout_threads: usize,
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/// Which quirks mode are we rendering the document in?
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quirks_mode: Option<QuirksMode>
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}
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impl LayoutThreadFactory for LayoutThread {
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type Message = Msg;
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/// Spawns a new layout thread.
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fn create(id: PipelineId,
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top_level_frame_id: Option<FrameId>,
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url: ServoUrl,
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is_iframe: bool,
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chan: (Sender<Msg>, Receiver<Msg>),
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pipeline_port: IpcReceiver<LayoutControlMsg>,
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constellation_chan: IpcSender<ConstellationMsg>,
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script_chan: IpcSender<ConstellationControlMsg>,
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image_cache_thread: ImageCacheThread,
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font_cache_thread: FontCacheThread,
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time_profiler_chan: time::ProfilerChan,
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mem_profiler_chan: mem::ProfilerChan,
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content_process_shutdown_chan: Option<IpcSender<()>>,
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webrender_api_sender: webrender_traits::RenderApiSender,
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layout_threads: usize) {
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thread::Builder::new().name(format!("LayoutThread {:?}", id)).spawn(move || {
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thread_state::initialize(thread_state::LAYOUT);
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if let Some(top_level_frame_id) = top_level_frame_id {
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FrameId::install(top_level_frame_id);
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}
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{ // Ensures layout thread is destroyed before we send shutdown message
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let sender = chan.0;
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let layout = LayoutThread::new(id,
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url,
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is_iframe,
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chan.1,
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pipeline_port,
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constellation_chan,
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script_chan,
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image_cache_thread,
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font_cache_thread,
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time_profiler_chan,
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mem_profiler_chan.clone(),
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webrender_api_sender,
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layout_threads);
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let reporter_name = format!("layout-reporter-{}", id);
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mem_profiler_chan.run_with_memory_reporting(|| {
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layout.start();
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}, reporter_name, sender, Msg::CollectReports);
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}
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if let Some(content_process_shutdown_chan) = content_process_shutdown_chan {
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let _ = content_process_shutdown_chan.send(());
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}
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}).expect("Thread spawning failed");
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}
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}
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/// The `LayoutThread` `rw_data` lock must remain locked until the first reflow,
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/// as RPC calls don't make sense until then. Use this in combination with
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/// `LayoutThread::lock_rw_data` and `LayoutThread::return_rw_data`.
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pub enum RWGuard<'a> {
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/// If the lock was previously held, from when the thread started.
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Held(MutexGuard<'a, LayoutThreadData>),
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/// If the lock was just used, and has been returned since there has been
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/// a reflow already.
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Used(MutexGuard<'a, LayoutThreadData>),
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}
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impl<'a> Deref for RWGuard<'a> {
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type Target = LayoutThreadData;
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fn deref(&self) -> &LayoutThreadData {
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match *self {
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RWGuard::Held(ref x) => &**x,
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RWGuard::Used(ref x) => &**x,
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}
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}
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}
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impl<'a> DerefMut for RWGuard<'a> {
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fn deref_mut(&mut self) -> &mut LayoutThreadData {
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match *self {
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RWGuard::Held(ref mut x) => &mut **x,
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RWGuard::Used(ref mut x) => &mut **x,
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}
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}
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}
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struct RwData<'a, 'b: 'a> {
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rw_data: &'b Arc<Mutex<LayoutThreadData>>,
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possibly_locked_rw_data: &'a mut Option<MutexGuard<'b, LayoutThreadData>>,
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}
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impl<'a, 'b: 'a> RwData<'a, 'b> {
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/// If no reflow has happened yet, this will just return the lock in
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/// `possibly_locked_rw_data`. Otherwise, it will acquire the `rw_data` lock.
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///
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/// If you do not wish RPCs to remain blocked, just drop the `RWGuard`
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/// returned from this function. If you _do_ wish for them to remain blocked,
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/// use `block`.
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fn lock(&mut self) -> RWGuard<'b> {
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match self.possibly_locked_rw_data.take() {
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None => RWGuard::Used(self.rw_data.lock().unwrap()),
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Some(x) => RWGuard::Held(x),
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}
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}
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/// If no reflow has ever been triggered, this will keep the lock, locked
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/// (and saved in `possibly_locked_rw_data`). If it has been, the lock will
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/// be unlocked.
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fn block(&mut self, rw_data: RWGuard<'b>) {
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match rw_data {
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RWGuard::Used(x) => drop(x),
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RWGuard::Held(x) => *self.possibly_locked_rw_data = Some(x),
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}
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}
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}
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fn add_font_face_rules(stylesheet: &Stylesheet,
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device: &Device,
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font_cache_thread: &FontCacheThread,
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font_cache_sender: &IpcSender<()>,
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outstanding_web_fonts_counter: &Arc<AtomicUsize>) {
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if opts::get().load_webfonts_synchronously {
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let (sender, receiver) = ipc::channel().unwrap();
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stylesheet.effective_font_face_rules(&device, |font_face| {
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let effective_sources = font_face.effective_sources();
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font_cache_thread.add_web_font(font_face.family.clone(),
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effective_sources,
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sender.clone());
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receiver.recv().unwrap();
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})
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} else {
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stylesheet.effective_font_face_rules(&device, |font_face| {
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let effective_sources = font_face.effective_sources();
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outstanding_web_fonts_counter.fetch_add(1, Ordering::SeqCst);
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font_cache_thread.add_web_font(font_face.family.clone(),
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effective_sources,
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(*font_cache_sender).clone());
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})
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}
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}
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impl LayoutThread {
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/// Creates a new `LayoutThread` structure.
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fn new(id: PipelineId,
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url: ServoUrl,
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is_iframe: bool,
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port: Receiver<Msg>,
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pipeline_port: IpcReceiver<LayoutControlMsg>,
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constellation_chan: IpcSender<ConstellationMsg>,
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script_chan: IpcSender<ConstellationControlMsg>,
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image_cache_thread: ImageCacheThread,
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font_cache_thread: FontCacheThread,
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time_profiler_chan: time::ProfilerChan,
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mem_profiler_chan: mem::ProfilerChan,
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webrender_api_sender: webrender_traits::RenderApiSender,
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layout_threads: usize)
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-> LayoutThread {
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let device = Device::new(
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MediaType::Screen,
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opts::get().initial_window_size.to_f32() * ScaleFactor::new(1.0));
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let configuration =
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rayon::Configuration::new().set_num_threads(layout_threads);
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let parallel_traversal = rayon::ThreadPool::new(configuration).ok();
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debug!("Possible layout Threads: {}", layout_threads);
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// Create the channel on which new animations can be sent.
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let (new_animations_sender, new_animations_receiver) = channel();
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// Proxy IPC messages from the pipeline to the layout thread.
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let pipeline_receiver = ROUTER.route_ipc_receiver_to_new_mpsc_receiver(pipeline_port);
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// Ask the router to proxy IPC messages from the image cache thread to the layout thread.
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let (ipc_image_cache_sender, ipc_image_cache_receiver) = ipc::channel().unwrap();
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let image_cache_receiver =
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ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_image_cache_receiver);
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// Ask the router to proxy IPC messages from the font cache thread to the layout thread.
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let (ipc_font_cache_sender, ipc_font_cache_receiver) = ipc::channel().unwrap();
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let font_cache_receiver =
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ROUTER.route_ipc_receiver_to_new_mpsc_receiver(ipc_font_cache_receiver);
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let stylist = Arc::new(Stylist::new(device));
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let outstanding_web_fonts_counter = Arc::new(AtomicUsize::new(0));
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for stylesheet in &*UA_STYLESHEETS.user_or_user_agent_stylesheets {
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add_font_face_rules(stylesheet,
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&stylist.device,
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&font_cache_thread,
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&ipc_font_cache_sender,
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&outstanding_web_fonts_counter);
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}
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LayoutThread {
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id: id,
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url: url,
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is_iframe: is_iframe,
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port: port,
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pipeline_port: pipeline_receiver,
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script_chan: script_chan.clone(),
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constellation_chan: constellation_chan.clone(),
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time_profiler_chan: time_profiler_chan,
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mem_profiler_chan: mem_profiler_chan,
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image_cache_thread: image_cache_thread,
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font_cache_thread: font_cache_thread,
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first_reflow: true,
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image_cache_receiver: image_cache_receiver,
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image_cache_sender: ImageCacheChan(ipc_image_cache_sender),
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font_cache_receiver: font_cache_receiver,
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font_cache_sender: ipc_font_cache_sender,
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parallel_traversal: parallel_traversal,
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parallel_flag: true,
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generation: 0,
|
|
new_animations_sender: new_animations_sender,
|
|
new_animations_receiver: new_animations_receiver,
|
|
outstanding_web_fonts: outstanding_web_fonts_counter,
|
|
root_flow: None,
|
|
running_animations: Arc::new(RwLock::new(HashMap::new())),
|
|
expired_animations: Arc::new(RwLock::new(HashMap::new())),
|
|
epoch: Epoch(0),
|
|
viewport_size: Size2D::new(Au(0), Au(0)),
|
|
webrender_api: webrender_api_sender.create_api(),
|
|
rw_data: Arc::new(Mutex::new(
|
|
LayoutThreadData {
|
|
constellation_chan: constellation_chan,
|
|
display_list: None,
|
|
stylist: stylist,
|
|
content_box_response: None,
|
|
content_boxes_response: Vec::new(),
|
|
client_rect_response: Rect::zero(),
|
|
hit_test_response: (None, false),
|
|
scroll_root_id_response: None,
|
|
scroll_area_response: Rect::zero(),
|
|
overflow_response: NodeOverflowResponse(None),
|
|
resolved_style_response: String::new(),
|
|
offset_parent_response: OffsetParentResponse::empty(),
|
|
margin_style_response: MarginStyleResponse::empty(),
|
|
stacking_context_scroll_offsets: HashMap::new(),
|
|
text_index_response: TextIndexResponse(None),
|
|
})),
|
|
error_reporter: CSSErrorReporter {
|
|
pipelineid: id,
|
|
script_chan: Arc::new(Mutex::new(script_chan)),
|
|
},
|
|
webrender_image_cache:
|
|
Arc::new(RwLock::new(HashMap::with_hasher(Default::default()))),
|
|
timer:
|
|
if PREFS.get("layout.animations.test.enabled")
|
|
.as_boolean().unwrap_or(false) {
|
|
Timer::test_mode()
|
|
} else {
|
|
Timer::new()
|
|
},
|
|
layout_threads: layout_threads,
|
|
quirks_mode: None,
|
|
}
|
|
}
|
|
|
|
/// Starts listening on the port.
|
|
fn start(mut self) {
|
|
let rw_data = self.rw_data.clone();
|
|
let mut possibly_locked_rw_data = Some(rw_data.lock().unwrap());
|
|
let mut rw_data = RwData {
|
|
rw_data: &rw_data,
|
|
possibly_locked_rw_data: &mut possibly_locked_rw_data,
|
|
};
|
|
while self.handle_request(&mut rw_data) {
|
|
// Loop indefinitely.
|
|
}
|
|
}
|
|
|
|
// Create a layout context for use in building display lists, hit testing, &c.
|
|
fn build_shared_layout_context(&self,
|
|
rw_data: &LayoutThreadData,
|
|
screen_size_changed: bool,
|
|
goal: ReflowGoal)
|
|
-> SharedLayoutContext {
|
|
let thread_local_style_context_creation_data =
|
|
ThreadLocalStyleContextCreationInfo::new(self.new_animations_sender.clone());
|
|
|
|
SharedLayoutContext {
|
|
style_context: SharedStyleContext {
|
|
viewport_size: self.viewport_size.clone(),
|
|
screen_size_changed: screen_size_changed,
|
|
stylist: rw_data.stylist.clone(),
|
|
goal: goal,
|
|
running_animations: self.running_animations.clone(),
|
|
expired_animations: self.expired_animations.clone(),
|
|
error_reporter: self.error_reporter.clone(),
|
|
local_context_creation_data: Mutex::new(thread_local_style_context_creation_data),
|
|
timer: self.timer.clone(),
|
|
quirks_mode: self.quirks_mode.unwrap(),
|
|
// FIXME(bz): This isn't really right, but it's no more wrong
|
|
// than what we used to do. See
|
|
// https://github.com/servo/servo/issues/14773 for fixing it
|
|
// properly.
|
|
default_computed_values: Arc::new(ComputedValues::initial_values().clone()),
|
|
},
|
|
image_cache_thread: Mutex::new(self.image_cache_thread.clone()),
|
|
image_cache_sender: Mutex::new(self.image_cache_sender.clone()),
|
|
font_cache_thread: Mutex::new(self.font_cache_thread.clone()),
|
|
webrender_image_cache: self.webrender_image_cache.clone(),
|
|
}
|
|
}
|
|
|
|
/// Receives and dispatches messages from the script and constellation threads
|
|
fn handle_request<'a, 'b>(&mut self, possibly_locked_rw_data: &mut RwData<'a, 'b>) -> bool {
|
|
enum Request {
|
|
FromPipeline(LayoutControlMsg),
|
|
FromScript(Msg),
|
|
FromImageCache,
|
|
FromFontCache,
|
|
}
|
|
|
|
let request = {
|
|
let port_from_script = &self.port;
|
|
let port_from_pipeline = &self.pipeline_port;
|
|
let port_from_image_cache = &self.image_cache_receiver;
|
|
let port_from_font_cache = &self.font_cache_receiver;
|
|
select! {
|
|
msg = port_from_pipeline.recv() => {
|
|
Request::FromPipeline(msg.unwrap())
|
|
},
|
|
msg = port_from_script.recv() => {
|
|
Request::FromScript(msg.unwrap())
|
|
},
|
|
msg = port_from_image_cache.recv() => {
|
|
msg.unwrap();
|
|
Request::FromImageCache
|
|
},
|
|
msg = port_from_font_cache.recv() => {
|
|
msg.unwrap();
|
|
Request::FromFontCache
|
|
}
|
|
}
|
|
};
|
|
|
|
match request {
|
|
Request::FromPipeline(LayoutControlMsg::SetStackingContextScrollStates(
|
|
new_scroll_states)) => {
|
|
self.handle_request_helper(Msg::SetStackingContextScrollStates(new_scroll_states),
|
|
possibly_locked_rw_data)
|
|
},
|
|
Request::FromPipeline(LayoutControlMsg::TickAnimations) => {
|
|
self.handle_request_helper(Msg::TickAnimations, possibly_locked_rw_data)
|
|
},
|
|
Request::FromPipeline(LayoutControlMsg::GetCurrentEpoch(sender)) => {
|
|
self.handle_request_helper(Msg::GetCurrentEpoch(sender), possibly_locked_rw_data)
|
|
},
|
|
Request::FromPipeline(LayoutControlMsg::GetWebFontLoadState(sender)) => {
|
|
self.handle_request_helper(Msg::GetWebFontLoadState(sender),
|
|
possibly_locked_rw_data)
|
|
},
|
|
Request::FromPipeline(LayoutControlMsg::ExitNow) => {
|
|
self.handle_request_helper(Msg::ExitNow, possibly_locked_rw_data)
|
|
},
|
|
Request::FromScript(msg) => {
|
|
self.handle_request_helper(msg, possibly_locked_rw_data)
|
|
},
|
|
Request::FromImageCache => {
|
|
self.repaint(possibly_locked_rw_data)
|
|
},
|
|
Request::FromFontCache => {
|
|
let _rw_data = possibly_locked_rw_data.lock();
|
|
self.outstanding_web_fonts.fetch_sub(1, Ordering::SeqCst);
|
|
font_context::invalidate_font_caches();
|
|
self.script_chan.send(ConstellationControlMsg::WebFontLoaded(self.id)).unwrap();
|
|
true
|
|
},
|
|
}
|
|
}
|
|
|
|
/// Repaint the scene, without performing style matching. This is typically
|
|
/// used when an image arrives asynchronously and triggers a relayout and
|
|
/// repaint.
|
|
/// TODO: In the future we could detect if the image size hasn't changed
|
|
/// since last time and avoid performing a complete layout pass.
|
|
fn repaint<'a, 'b>(&mut self, possibly_locked_rw_data: &mut RwData<'a, 'b>) -> bool {
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
|
|
if let Some(mut root_flow) = self.root_flow.clone() {
|
|
let flow = flow::mut_base(FlowRef::deref_mut(&mut root_flow));
|
|
flow.restyle_damage.insert(REPAINT);
|
|
}
|
|
|
|
let reflow_info = Reflow {
|
|
goal: ReflowGoal::ForDisplay,
|
|
page_clip_rect: max_rect(),
|
|
};
|
|
let mut layout_context = self.build_shared_layout_context(&*rw_data,
|
|
false,
|
|
reflow_info.goal);
|
|
|
|
self.perform_post_style_recalc_layout_passes(&reflow_info,
|
|
None,
|
|
None,
|
|
&mut *rw_data,
|
|
&mut layout_context);
|
|
|
|
|
|
true
|
|
}
|
|
|
|
/// Receives and dispatches messages from other threads.
|
|
fn handle_request_helper<'a, 'b>(&mut self,
|
|
request: Msg,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>)
|
|
-> bool {
|
|
match request {
|
|
Msg::AddStylesheet(style_info) => {
|
|
self.handle_add_stylesheet(style_info, possibly_locked_rw_data)
|
|
}
|
|
Msg::SetQuirksMode => self.handle_set_quirks_mode(possibly_locked_rw_data),
|
|
Msg::GetRPC(response_chan) => {
|
|
response_chan.send(box LayoutRPCImpl(self.rw_data.clone()) as
|
|
Box<LayoutRPC + Send>).unwrap();
|
|
},
|
|
Msg::Reflow(data) => {
|
|
profile(time::ProfilerCategory::LayoutPerform,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| self.handle_reflow(&data, possibly_locked_rw_data));
|
|
},
|
|
Msg::TickAnimations => self.tick_all_animations(possibly_locked_rw_data),
|
|
Msg::ReflowWithNewlyLoadedWebFont => {
|
|
self.reflow_with_newly_loaded_web_font(possibly_locked_rw_data)
|
|
}
|
|
Msg::SetStackingContextScrollStates(new_scroll_states) => {
|
|
self.set_stacking_context_scroll_states(new_scroll_states,
|
|
possibly_locked_rw_data);
|
|
}
|
|
Msg::ReapStyleAndLayoutData(dead_data) => {
|
|
unsafe {
|
|
drop_style_and_layout_data(dead_data)
|
|
}
|
|
}
|
|
Msg::CollectReports(reports_chan) => {
|
|
self.collect_reports(reports_chan, possibly_locked_rw_data);
|
|
},
|
|
Msg::GetCurrentEpoch(sender) => {
|
|
let _rw_data = possibly_locked_rw_data.lock();
|
|
sender.send(self.epoch).unwrap();
|
|
},
|
|
Msg::AdvanceClockMs(how_many, do_tick) => {
|
|
self.handle_advance_clock_ms(how_many, possibly_locked_rw_data, do_tick);
|
|
}
|
|
Msg::GetWebFontLoadState(sender) => {
|
|
let _rw_data = possibly_locked_rw_data.lock();
|
|
let outstanding_web_fonts = self.outstanding_web_fonts.load(Ordering::SeqCst);
|
|
sender.send(outstanding_web_fonts != 0).unwrap();
|
|
},
|
|
Msg::CreateLayoutThread(info) => {
|
|
self.create_layout_thread(info)
|
|
}
|
|
Msg::SetFinalUrl(final_url) => {
|
|
self.url = final_url;
|
|
},
|
|
Msg::PrepareToExit(response_chan) => {
|
|
self.prepare_to_exit(response_chan);
|
|
return false
|
|
},
|
|
Msg::ExitNow => {
|
|
debug!("layout: ExitNow received");
|
|
self.exit_now();
|
|
return false
|
|
}
|
|
}
|
|
|
|
true
|
|
}
|
|
|
|
fn collect_reports<'a, 'b>(&self,
|
|
reports_chan: ReportsChan,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let mut reports = vec![];
|
|
|
|
// FIXME(njn): Just measuring the display tree for now.
|
|
let rw_data = possibly_locked_rw_data.lock();
|
|
let display_list = rw_data.display_list.as_ref();
|
|
let formatted_url = &format!("url({})", self.url);
|
|
reports.push(Report {
|
|
path: path![formatted_url, "layout-thread", "display-list"],
|
|
kind: ReportKind::ExplicitJemallocHeapSize,
|
|
size: display_list.map_or(0, |sc| sc.heap_size_of_children()),
|
|
});
|
|
|
|
let stylist = rw_data.stylist.as_ref();
|
|
reports.push(Report {
|
|
path: path![formatted_url, "layout-thread", "stylist"],
|
|
kind: ReportKind::ExplicitJemallocHeapSize,
|
|
size: stylist.heap_size_of_children(),
|
|
});
|
|
|
|
// The LayoutThread has data in Persistent TLS...
|
|
reports.push(Report {
|
|
path: path![formatted_url, "layout-thread", "local-context"],
|
|
kind: ReportKind::ExplicitJemallocHeapSize,
|
|
size: heap_size_of_persistent_local_context(),
|
|
});
|
|
|
|
reports_chan.send(reports);
|
|
}
|
|
|
|
fn create_layout_thread(&self, info: NewLayoutThreadInfo) {
|
|
LayoutThread::create(info.id,
|
|
FrameId::installed(),
|
|
info.url.clone(),
|
|
info.is_parent,
|
|
info.layout_pair,
|
|
info.pipeline_port,
|
|
info.constellation_chan,
|
|
info.script_chan.clone(),
|
|
self.image_cache_thread.clone(),
|
|
self.font_cache_thread.clone(),
|
|
self.time_profiler_chan.clone(),
|
|
self.mem_profiler_chan.clone(),
|
|
info.content_process_shutdown_chan,
|
|
self.webrender_api.clone_sender(),
|
|
info.layout_threads);
|
|
}
|
|
|
|
/// Enters a quiescent state in which no new messages will be processed until an `ExitNow` is
|
|
/// received. A pong is immediately sent on the given response channel.
|
|
fn prepare_to_exit(&mut self, response_chan: Sender<()>) {
|
|
response_chan.send(()).unwrap();
|
|
loop {
|
|
match self.port.recv().unwrap() {
|
|
Msg::ReapStyleAndLayoutData(dead_data) => {
|
|
unsafe {
|
|
drop_style_and_layout_data(dead_data)
|
|
}
|
|
}
|
|
Msg::ExitNow => {
|
|
debug!("layout thread is exiting...");
|
|
self.exit_now();
|
|
break
|
|
}
|
|
Msg::CollectReports(_) => {
|
|
// Just ignore these messages at this point.
|
|
}
|
|
_ => {
|
|
panic!("layout: unexpected message received after `PrepareToExitMsg`")
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/// Shuts down the layout thread now. If there are any DOM nodes left, layout will now (safely)
|
|
/// crash.
|
|
fn exit_now(&mut self) {
|
|
// Drop the rayon threadpool if present.
|
|
let _ = self.parallel_traversal.take();
|
|
}
|
|
|
|
fn handle_add_stylesheet<'a, 'b>(&self,
|
|
stylesheet: Arc<Stylesheet>,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
// Find all font-face rules and notify the font cache of them.
|
|
// GWTODO: Need to handle unloading web fonts.
|
|
|
|
let rw_data = possibly_locked_rw_data.lock();
|
|
if stylesheet.is_effective_for_device(&rw_data.stylist.device) {
|
|
add_font_face_rules(&*stylesheet,
|
|
&rw_data.stylist.device,
|
|
&self.font_cache_thread,
|
|
&self.font_cache_sender,
|
|
&self.outstanding_web_fonts);
|
|
}
|
|
|
|
possibly_locked_rw_data.block(rw_data);
|
|
}
|
|
|
|
/// Advances the animation clock of the document.
|
|
fn handle_advance_clock_ms<'a, 'b>(&mut self,
|
|
how_many_ms: i32,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>,
|
|
tick_animations: bool) {
|
|
self.timer.increment(how_many_ms as f64 / 1000.0);
|
|
if tick_animations {
|
|
self.tick_all_animations(possibly_locked_rw_data);
|
|
}
|
|
}
|
|
|
|
/// Sets quirks mode for the document, causing the quirks mode stylesheet to be used.
|
|
fn handle_set_quirks_mode<'a, 'b>(&self, possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
Arc::get_mut(&mut rw_data.stylist).unwrap().set_quirks_mode(true);
|
|
possibly_locked_rw_data.block(rw_data);
|
|
}
|
|
|
|
fn try_get_layout_root<N: LayoutNode>(&self, node: N) -> Option<FlowRef> {
|
|
let mut data = match node.mutate_layout_data() {
|
|
Some(x) => x,
|
|
None => return None,
|
|
};
|
|
let result = data.flow_construction_result.swap_out();
|
|
|
|
let mut flow = match result {
|
|
ConstructionResult::Flow(mut flow, abs_descendants) => {
|
|
// Note: Assuming that the root has display 'static' (as per
|
|
// CSS Section 9.3.1). Otherwise, if it were absolutely
|
|
// positioned, it would return a reference to itself in
|
|
// `abs_descendants` and would lead to a circular reference.
|
|
// Set Root as CB for any remaining absolute descendants.
|
|
flow.set_absolute_descendants(abs_descendants);
|
|
flow
|
|
}
|
|
_ => return None,
|
|
};
|
|
|
|
FlowRef::deref_mut(&mut flow).mark_as_root();
|
|
|
|
Some(flow)
|
|
}
|
|
|
|
/// Performs layout constraint solving.
|
|
///
|
|
/// This corresponds to `Reflow()` in Gecko and `layout()` in WebKit/Blink and should be
|
|
/// benchmarked against those two. It is marked `#[inline(never)]` to aid profiling.
|
|
#[inline(never)]
|
|
fn solve_constraints(layout_root: &mut Flow,
|
|
shared_layout_context: &SharedLayoutContext) {
|
|
let _scope = layout_debug_scope!("solve_constraints");
|
|
sequential::traverse_flow_tree_preorder(layout_root, shared_layout_context);
|
|
}
|
|
|
|
/// Performs layout constraint solving in parallel.
|
|
///
|
|
/// This corresponds to `Reflow()` in Gecko and `layout()` in WebKit/Blink and should be
|
|
/// benchmarked against those two. It is marked `#[inline(never)]` to aid profiling.
|
|
#[inline(never)]
|
|
fn solve_constraints_parallel(traversal: &rayon::ThreadPool,
|
|
layout_root: &mut Flow,
|
|
profiler_metadata: Option<TimerMetadata>,
|
|
time_profiler_chan: time::ProfilerChan,
|
|
shared_layout_context: &SharedLayoutContext) {
|
|
let _scope = layout_debug_scope!("solve_constraints_parallel");
|
|
|
|
// NOTE: this currently computes borders, so any pruning should separate that
|
|
// operation out.
|
|
parallel::traverse_flow_tree_preorder(layout_root,
|
|
profiler_metadata,
|
|
time_profiler_chan,
|
|
shared_layout_context,
|
|
traversal);
|
|
}
|
|
|
|
/// Computes the stacking-relative positions of all flows and, if the painting is dirty and the
|
|
/// reflow goal and query type need it, builds the display list.
|
|
fn compute_abs_pos_and_build_display_list(&mut self,
|
|
data: &Reflow,
|
|
query_type: Option<&ReflowQueryType>,
|
|
document: Option<&ServoLayoutDocument>,
|
|
layout_root: &mut Flow,
|
|
shared_layout_context: &mut SharedLayoutContext,
|
|
rw_data: &mut LayoutThreadData) {
|
|
let writing_mode = flow::base(layout_root).writing_mode;
|
|
let (metadata, sender) = (self.profiler_metadata(), self.time_profiler_chan.clone());
|
|
profile(time::ProfilerCategory::LayoutDispListBuild,
|
|
metadata.clone(),
|
|
sender.clone(),
|
|
|| {
|
|
flow::mut_base(layout_root).stacking_relative_position =
|
|
LogicalPoint::zero(writing_mode).to_physical(writing_mode,
|
|
self.viewport_size);
|
|
|
|
flow::mut_base(layout_root).clip =
|
|
ClippingRegion::from_rect(&data.page_clip_rect);
|
|
|
|
if flow::base(layout_root).restyle_damage.contains(REPOSITION) {
|
|
layout_root.traverse_preorder(&ComputeAbsolutePositions {
|
|
layout_context: shared_layout_context
|
|
});
|
|
}
|
|
|
|
if flow::base(layout_root).restyle_damage.contains(REPAINT) ||
|
|
rw_data.display_list.is_none() {
|
|
let display_list_needed = query_type.map(reflow_query_type_needs_display_list)
|
|
.unwrap_or(false);
|
|
match (data.goal, display_list_needed) {
|
|
(ReflowGoal::ForDisplay, _) | (ReflowGoal::ForScriptQuery, true) => {
|
|
let mut build_state =
|
|
sequential::build_display_list_for_subtree(layout_root,
|
|
shared_layout_context);
|
|
|
|
debug!("Done building display list.");
|
|
|
|
let root_size = {
|
|
let root_flow = flow::base(layout_root);
|
|
if rw_data.stylist.viewport_constraints().is_some() {
|
|
root_flow.position.size.to_physical(root_flow.writing_mode)
|
|
} else {
|
|
root_flow.overflow.scroll.size
|
|
}
|
|
};
|
|
|
|
let origin = Rect::new(Point2D::new(Au(0), Au(0)), root_size);
|
|
build_state.root_stacking_context.bounds = origin;
|
|
build_state.root_stacking_context.overflow = origin;
|
|
rw_data.display_list = Some(Arc::new(build_state.to_display_list()));
|
|
}
|
|
(ReflowGoal::ForScriptQuery, false) => {}
|
|
}
|
|
}
|
|
|
|
if data.goal != ReflowGoal::ForDisplay {
|
|
// Defer the paint step until the next ForDisplay.
|
|
//
|
|
// We need to tell the document about this so it doesn't
|
|
// incorrectly suppress reflows. See #13131.
|
|
document.expect("No document in a non-display reflow?")
|
|
.needs_paint_from_layout();
|
|
return;
|
|
}
|
|
if let Some(document) = document {
|
|
document.will_paint();
|
|
}
|
|
let display_list = (*rw_data.display_list.as_ref().unwrap()).clone();
|
|
|
|
if opts::get().dump_display_list {
|
|
display_list.print();
|
|
}
|
|
if opts::get().dump_display_list_json {
|
|
println!("{}", serde_json::to_string_pretty(&display_list).unwrap());
|
|
}
|
|
|
|
debug!("Layout done!");
|
|
|
|
// TODO: Avoid the temporary conversion and build webrender sc/dl directly!
|
|
let builder = rw_data.display_list.as_ref().unwrap().convert_to_webrender(self.id);
|
|
|
|
let viewport_size = Size2D::new(self.viewport_size.width.to_f32_px(),
|
|
self.viewport_size.height.to_f32_px());
|
|
|
|
self.epoch.next();
|
|
let Epoch(epoch_number) = self.epoch;
|
|
|
|
let viewport_size = webrender_traits::LayoutSize::from_untyped(&viewport_size);
|
|
self.webrender_api.set_root_display_list(
|
|
Some(get_root_flow_background_color(layout_root)),
|
|
webrender_traits::Epoch(epoch_number),
|
|
viewport_size,
|
|
builder);
|
|
});
|
|
}
|
|
|
|
/// The high-level routine that performs layout threads.
|
|
fn handle_reflow<'a, 'b>(&mut self,
|
|
data: &ScriptReflow,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let document = unsafe { ServoLayoutNode::new(&data.document) };
|
|
let document = document.as_document().unwrap();
|
|
self.quirks_mode = Some(document.quirks_mode());
|
|
|
|
// FIXME(pcwalton): Combine `ReflowGoal` and `ReflowQueryType`. Then remove this assert.
|
|
debug_assert!((data.reflow_info.goal == ReflowGoal::ForDisplay &&
|
|
data.query_type == ReflowQueryType::NoQuery) ||
|
|
(data.reflow_info.goal == ReflowGoal::ForScriptQuery &&
|
|
data.query_type != ReflowQueryType::NoQuery));
|
|
|
|
// Parallelize if there's more than 750 objects based on rzambre's suggestion
|
|
// https://github.com/servo/servo/issues/10110
|
|
self.parallel_flag = self.layout_threads > 1 && data.dom_count > 750;
|
|
debug!("layout: received layout request for: {}", self.url);
|
|
debug!("Number of objects in DOM: {}", data.dom_count);
|
|
debug!("layout: parallel? {}", self.parallel_flag);
|
|
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
|
|
let element: ServoLayoutElement = match document.root_node() {
|
|
None => {
|
|
// Since we cannot compute anything, give spec-required placeholders.
|
|
debug!("layout: No root node: bailing");
|
|
match data.query_type {
|
|
ReflowQueryType::ContentBoxQuery(_) => {
|
|
rw_data.content_box_response = None;
|
|
},
|
|
ReflowQueryType::ContentBoxesQuery(_) => {
|
|
rw_data.content_boxes_response = Vec::new();
|
|
},
|
|
ReflowQueryType::HitTestQuery(..) => {
|
|
rw_data.hit_test_response = (None, false);
|
|
},
|
|
ReflowQueryType::NodeGeometryQuery(_) => {
|
|
rw_data.client_rect_response = Rect::zero();
|
|
},
|
|
ReflowQueryType::NodeScrollGeometryQuery(_) => {
|
|
rw_data.scroll_area_response = Rect::zero();
|
|
},
|
|
ReflowQueryType::NodeOverflowQuery(_) => {
|
|
rw_data.overflow_response = NodeOverflowResponse(None);
|
|
},
|
|
ReflowQueryType::NodeScrollRootIdQuery(_) => {
|
|
rw_data.scroll_root_id_response = None;
|
|
},
|
|
ReflowQueryType::ResolvedStyleQuery(_, _, _) => {
|
|
rw_data.resolved_style_response = String::new();
|
|
},
|
|
ReflowQueryType::OffsetParentQuery(_) => {
|
|
rw_data.offset_parent_response = OffsetParentResponse::empty();
|
|
},
|
|
ReflowQueryType::MarginStyleQuery(_) => {
|
|
rw_data.margin_style_response = MarginStyleResponse::empty();
|
|
},
|
|
ReflowQueryType::TextIndexQuery(..) => {
|
|
rw_data.text_index_response = TextIndexResponse(None);
|
|
}
|
|
ReflowQueryType::NoQuery => {}
|
|
}
|
|
return;
|
|
},
|
|
Some(x) => x.as_element().unwrap(),
|
|
};
|
|
|
|
debug!("layout: processing reflow request for: {:?} ({}) (query={:?})",
|
|
element, self.url, data.query_type);
|
|
debug!("{:?}", ShowSubtree(element.as_node()));
|
|
|
|
let initial_viewport = data.window_size.initial_viewport;
|
|
let old_viewport_size = self.viewport_size;
|
|
let current_screen_size = Size2D::new(Au::from_f32_px(initial_viewport.width),
|
|
Au::from_f32_px(initial_viewport.height));
|
|
|
|
// Calculate the actual viewport as per DEVICE-ADAPT § 6
|
|
let device = Device::new(MediaType::Screen, initial_viewport);
|
|
Arc::get_mut(&mut rw_data.stylist).unwrap().set_device(device, &data.document_stylesheets);
|
|
|
|
self.viewport_size =
|
|
rw_data.stylist.viewport_constraints().map_or(current_screen_size, |constraints| {
|
|
debug!("Viewport constraints: {:?}", constraints);
|
|
|
|
// other rules are evaluated against the actual viewport
|
|
Size2D::new(Au::from_f32_px(constraints.size.width),
|
|
Au::from_f32_px(constraints.size.height))
|
|
});
|
|
|
|
// Handle conditions where the entire flow tree is invalid.
|
|
let mut needs_dirtying = false;
|
|
|
|
let viewport_size_changed = self.viewport_size != old_viewport_size;
|
|
if viewport_size_changed {
|
|
if let Some(constraints) = rw_data.stylist.viewport_constraints() {
|
|
// let the constellation know about the viewport constraints
|
|
rw_data.constellation_chan
|
|
.send(ConstellationMsg::ViewportConstrained(self.id, constraints.clone()))
|
|
.unwrap();
|
|
}
|
|
if data.document_stylesheets.iter().any(|sheet| sheet.dirty_on_viewport_size_change()) {
|
|
let mut iter = element.as_node().traverse_preorder();
|
|
|
|
let mut next = iter.next();
|
|
while let Some(node) = next {
|
|
if node.needs_dirty_on_viewport_size_changed() {
|
|
let el = node.as_element().unwrap();
|
|
if let Some(mut d) = element.mutate_data() {
|
|
if d.has_styles() {
|
|
d.ensure_restyle().hint.insert(&StoredRestyleHint::subtree());
|
|
}
|
|
}
|
|
if let Some(p) = el.parent_element() {
|
|
unsafe { p.note_dirty_descendant() };
|
|
}
|
|
|
|
next = iter.next_skipping_children();
|
|
} else {
|
|
next = iter.next();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// If the entire flow tree is invalid, then it will be reflowed anyhow.
|
|
needs_dirtying |= Arc::get_mut(&mut rw_data.stylist).unwrap().update(&data.document_stylesheets,
|
|
Some(&*UA_STYLESHEETS),
|
|
data.stylesheets_changed);
|
|
let needs_reflow = viewport_size_changed && !needs_dirtying;
|
|
if needs_dirtying {
|
|
if let Some(mut d) = element.mutate_data() {
|
|
if d.has_styles() {
|
|
d.ensure_restyle().hint.insert(&StoredRestyleHint::subtree());
|
|
}
|
|
}
|
|
}
|
|
if needs_reflow {
|
|
if let Some(mut flow) = self.try_get_layout_root(element.as_node()) {
|
|
LayoutThread::reflow_all_nodes(FlowRef::deref_mut(&mut flow));
|
|
}
|
|
}
|
|
|
|
let restyles = document.drain_pending_restyles();
|
|
debug!("Draining restyles: {} (needs dirtying? {:?})", restyles.len(), needs_dirtying);
|
|
if !needs_dirtying {
|
|
for (el, restyle) in restyles {
|
|
// Propagate the descendant bit up the ancestors. Do this before
|
|
// the restyle calculation so that we can also do it for new
|
|
// unstyled nodes, which the descendants bit helps us find.
|
|
if let Some(parent) = el.parent_element() {
|
|
unsafe { parent.note_dirty_descendant() };
|
|
}
|
|
|
|
// If we haven't styled this node yet, we don't need to track a restyle.
|
|
let mut data = match el.mutate_layout_data() {
|
|
Some(d) => d,
|
|
None => continue,
|
|
};
|
|
let mut style_data = &mut data.base.style_data;
|
|
debug_assert!(style_data.has_current_styles());
|
|
let mut restyle_data = style_data.ensure_restyle();
|
|
|
|
// Stash the data on the element for processing by the style system.
|
|
restyle_data.hint = restyle.hint.into();
|
|
restyle_data.damage = restyle.damage;
|
|
if let Some(s) = restyle.snapshot {
|
|
restyle_data.snapshot.ensure(move || s);
|
|
}
|
|
debug!("Noting restyle for {:?}: {:?}", el, restyle_data);
|
|
}
|
|
}
|
|
|
|
// Create a layout context for use throughout the following passes.
|
|
let mut shared_layout_context = self.build_shared_layout_context(&*rw_data,
|
|
viewport_size_changed,
|
|
data.reflow_info.goal);
|
|
|
|
// NB: Type inference falls apart here for some reason, so we need to be very verbose. :-(
|
|
let traversal = RecalcStyleAndConstructFlows::new(shared_layout_context);
|
|
let dom_depth = Some(0); // This is always the root node.
|
|
let token = {
|
|
let stylist = &<RecalcStyleAndConstructFlows as
|
|
DomTraversal<ServoLayoutElement>>::shared_context(&traversal).stylist;
|
|
<RecalcStyleAndConstructFlows as
|
|
DomTraversal<ServoLayoutElement>>::pre_traverse(element, stylist, /* skip_root = */ false)
|
|
};
|
|
|
|
if token.should_traverse() {
|
|
// Recalculate CSS styles and rebuild flows and fragments.
|
|
profile(time::ProfilerCategory::LayoutStyleRecalc,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| {
|
|
// Perform CSS selector matching and flow construction.
|
|
if let (true, Some(pool)) = (self.parallel_flag, self.parallel_traversal.as_mut()) {
|
|
// Parallel mode
|
|
parallel::traverse_dom::<ServoLayoutElement, RecalcStyleAndConstructFlows>(
|
|
&traversal, element, dom_depth, token, pool);
|
|
} else {
|
|
// Sequential mode
|
|
sequential::traverse_dom::<ServoLayoutElement, RecalcStyleAndConstructFlows>(
|
|
&traversal, element, token);
|
|
}
|
|
});
|
|
// TODO(pcwalton): Measure energy usage of text shaping, perhaps?
|
|
let text_shaping_time =
|
|
(font::get_and_reset_text_shaping_performance_counter() as u64) /
|
|
(self.layout_threads as u64);
|
|
time::send_profile_data(time::ProfilerCategory::LayoutTextShaping,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
0,
|
|
text_shaping_time,
|
|
0,
|
|
0);
|
|
|
|
// Retrieve the (possibly rebuilt) root flow.
|
|
self.root_flow = self.try_get_layout_root(element.as_node());
|
|
}
|
|
|
|
shared_layout_context = traversal.destroy();
|
|
|
|
if opts::get().dump_style_tree {
|
|
println!("{:?}", ShowSubtreeDataAndPrimaryValues(element.as_node()));
|
|
}
|
|
|
|
if opts::get().dump_rule_tree {
|
|
shared_layout_context.style_context.stylist.rule_tree.dump_stdout();
|
|
}
|
|
|
|
// GC the rule tree if some heuristics are met.
|
|
unsafe { shared_layout_context.style_context.stylist.rule_tree.maybe_gc(); }
|
|
|
|
// Perform post-style recalculation layout passes.
|
|
self.perform_post_style_recalc_layout_passes(&data.reflow_info,
|
|
Some(&data.query_type),
|
|
Some(&document),
|
|
&mut rw_data,
|
|
&mut shared_layout_context);
|
|
|
|
self.respond_to_query_if_necessary(&data.query_type,
|
|
&mut *rw_data,
|
|
&mut shared_layout_context);
|
|
}
|
|
|
|
fn respond_to_query_if_necessary(&mut self,
|
|
query_type: &ReflowQueryType,
|
|
rw_data: &mut LayoutThreadData,
|
|
shared: &mut SharedLayoutContext) {
|
|
let mut root_flow = match self.root_flow.clone() {
|
|
Some(root_flow) => root_flow,
|
|
None => return,
|
|
};
|
|
let root_flow = FlowRef::deref_mut(&mut root_flow);
|
|
match *query_type {
|
|
ReflowQueryType::ContentBoxQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.content_box_response = process_content_box_request(node, root_flow);
|
|
},
|
|
ReflowQueryType::ContentBoxesQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.content_boxes_response = process_content_boxes_request(node, root_flow);
|
|
},
|
|
ReflowQueryType::HitTestQuery(translated_point, client_point, update_cursor) => {
|
|
let mut translated_point = Point2D::new(Au::from_f32_px(translated_point.x),
|
|
Au::from_f32_px(translated_point.y));
|
|
|
|
let client_point = Point2D::new(Au::from_f32_px(client_point.x),
|
|
Au::from_f32_px(client_point.y));
|
|
|
|
let result = rw_data.display_list
|
|
.as_ref()
|
|
.expect("Tried to hit test with no display list")
|
|
.hit_test(&mut translated_point,
|
|
&client_point,
|
|
&rw_data.stacking_context_scroll_offsets);
|
|
rw_data.hit_test_response = (result.last().cloned(), update_cursor);
|
|
},
|
|
ReflowQueryType::TextIndexQuery(node, mouse_x, mouse_y) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
let opaque_node = node.opaque();
|
|
let client_point = Point2D::new(Au::from_px(mouse_x),
|
|
Au::from_px(mouse_y));
|
|
rw_data.text_index_response =
|
|
TextIndexResponse(rw_data.display_list
|
|
.as_ref()
|
|
.expect("Tried to hit test with no display list")
|
|
.text_index(opaque_node,
|
|
&client_point,
|
|
&rw_data.stacking_context_scroll_offsets));
|
|
},
|
|
ReflowQueryType::NodeGeometryQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.client_rect_response = process_node_geometry_request(node, root_flow);
|
|
},
|
|
ReflowQueryType::NodeScrollGeometryQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.scroll_area_response = process_node_scroll_area_request(node, root_flow);
|
|
},
|
|
ReflowQueryType::NodeOverflowQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.overflow_response = process_node_overflow_request(node);
|
|
},
|
|
ReflowQueryType::NodeScrollRootIdQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.scroll_root_id_response = Some(process_node_scroll_root_id_request(node));
|
|
},
|
|
ReflowQueryType::ResolvedStyleQuery(node, ref pseudo, ref property) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.resolved_style_response =
|
|
process_resolved_style_request(shared,
|
|
node,
|
|
pseudo,
|
|
property,
|
|
root_flow);
|
|
},
|
|
ReflowQueryType::OffsetParentQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.offset_parent_response = process_offset_parent_query(node, root_flow);
|
|
},
|
|
ReflowQueryType::MarginStyleQuery(node) => {
|
|
let node = unsafe { ServoLayoutNode::new(&node) };
|
|
rw_data.margin_style_response = process_margin_style_query(node);
|
|
},
|
|
ReflowQueryType::NoQuery => {}
|
|
}
|
|
}
|
|
|
|
fn set_stacking_context_scroll_states<'a, 'b>(
|
|
&mut self,
|
|
new_scroll_states: Vec<StackingContextScrollState>,
|
|
possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
let mut script_scroll_states = vec![];
|
|
let mut layout_scroll_states = HashMap::new();
|
|
for new_scroll_state in &new_scroll_states {
|
|
let offset = new_scroll_state.scroll_offset;
|
|
layout_scroll_states.insert(new_scroll_state.scroll_root_id, offset);
|
|
|
|
if new_scroll_state.scroll_root_id == ScrollRootId::root() {
|
|
script_scroll_states.push((UntrustedNodeAddress::from_id(0), offset))
|
|
} else if !new_scroll_state.scroll_root_id.is_special() &&
|
|
new_scroll_state.scroll_root_id.fragment_type() == FragmentType::FragmentBody {
|
|
let id = new_scroll_state.scroll_root_id.id();
|
|
script_scroll_states.push((UntrustedNodeAddress::from_id(id), offset))
|
|
}
|
|
}
|
|
let _ = self.script_chan
|
|
.send(ConstellationControlMsg::SetScrollState(self.id, script_scroll_states));
|
|
rw_data.stacking_context_scroll_offsets = layout_scroll_states
|
|
}
|
|
|
|
fn tick_all_animations<'a, 'b>(&mut self, possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
self.tick_animations(&mut rw_data);
|
|
}
|
|
|
|
fn tick_animations(&mut self, rw_data: &mut LayoutThreadData) {
|
|
if opts::get().relayout_event {
|
|
println!("**** pipeline={}\tForDisplay\tSpecial\tAnimationTick", self.id);
|
|
}
|
|
|
|
let reflow_info = Reflow {
|
|
goal: ReflowGoal::ForDisplay,
|
|
page_clip_rect: max_rect(),
|
|
};
|
|
|
|
let mut layout_context = self.build_shared_layout_context(&*rw_data,
|
|
false,
|
|
reflow_info.goal);
|
|
|
|
if let Some(mut root_flow) = self.root_flow.clone() {
|
|
// Perform an abbreviated style recalc that operates without access to the DOM.
|
|
let animations = self.running_animations.read();
|
|
profile(time::ProfilerCategory::LayoutStyleRecalc,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| {
|
|
animation::recalc_style_for_animations(&layout_context,
|
|
FlowRef::deref_mut(&mut root_flow),
|
|
&animations)
|
|
});
|
|
}
|
|
|
|
self.perform_post_style_recalc_layout_passes(&reflow_info,
|
|
None,
|
|
None,
|
|
&mut *rw_data,
|
|
&mut layout_context);
|
|
}
|
|
|
|
fn reflow_with_newly_loaded_web_font<'a, 'b>(&mut self, possibly_locked_rw_data: &mut RwData<'a, 'b>) {
|
|
let mut rw_data = possibly_locked_rw_data.lock();
|
|
font_context::invalidate_font_caches();
|
|
|
|
let reflow_info = Reflow {
|
|
goal: ReflowGoal::ForDisplay,
|
|
page_clip_rect: max_rect(),
|
|
};
|
|
|
|
let mut layout_context = self.build_shared_layout_context(&*rw_data,
|
|
false,
|
|
reflow_info.goal);
|
|
|
|
// No need to do a style recalc here.
|
|
if self.root_flow.is_none() {
|
|
return
|
|
}
|
|
self.perform_post_style_recalc_layout_passes(&reflow_info,
|
|
None,
|
|
None,
|
|
&mut *rw_data,
|
|
&mut layout_context);
|
|
}
|
|
|
|
fn perform_post_style_recalc_layout_passes(&mut self,
|
|
data: &Reflow,
|
|
query_type: Option<&ReflowQueryType>,
|
|
document: Option<&ServoLayoutDocument>,
|
|
rw_data: &mut LayoutThreadData,
|
|
shared: &mut SharedLayoutContext) {
|
|
if let Some(mut root_flow) = self.root_flow.clone() {
|
|
// Kick off animations if any were triggered, expire completed ones.
|
|
animation::update_animation_state(&self.constellation_chan,
|
|
&self.script_chan,
|
|
&mut *self.running_animations.write(),
|
|
&mut *self.expired_animations.write(),
|
|
&self.new_animations_receiver,
|
|
self.id,
|
|
&self.timer);
|
|
|
|
profile(time::ProfilerCategory::LayoutRestyleDamagePropagation,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| {
|
|
// Call `compute_layout_damage` even in non-incremental mode, because it sets flags
|
|
// that are needed in both incremental and non-incremental traversals.
|
|
let damage = FlowRef::deref_mut(&mut root_flow).compute_layout_damage();
|
|
|
|
if opts::get().nonincremental_layout || damage.contains(REFLOW_ENTIRE_DOCUMENT) {
|
|
FlowRef::deref_mut(&mut root_flow).reflow_entire_document()
|
|
}
|
|
});
|
|
|
|
if opts::get().trace_layout {
|
|
layout_debug::begin_trace(root_flow.clone());
|
|
}
|
|
|
|
// Resolve generated content.
|
|
profile(time::ProfilerCategory::LayoutGeneratedContent,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| sequential::resolve_generated_content(FlowRef::deref_mut(&mut root_flow), &shared));
|
|
|
|
// Guess float placement.
|
|
profile(time::ProfilerCategory::LayoutFloatPlacementSpeculation,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| sequential::guess_float_placement(FlowRef::deref_mut(&mut root_flow)));
|
|
|
|
// Perform the primary layout passes over the flow tree to compute the locations of all
|
|
// the boxes.
|
|
if flow::base(&*root_flow).restyle_damage.intersects(REFLOW | REFLOW_OUT_OF_FLOW) {
|
|
profile(time::ProfilerCategory::LayoutMain,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| {
|
|
let profiler_metadata = self.profiler_metadata();
|
|
|
|
if let (true, Some(traversal)) = (self.parallel_flag, self.parallel_traversal.as_mut()) {
|
|
// Parallel mode.
|
|
LayoutThread::solve_constraints_parallel(traversal,
|
|
FlowRef::deref_mut(&mut root_flow),
|
|
profiler_metadata,
|
|
self.time_profiler_chan.clone(),
|
|
&*shared);
|
|
} else {
|
|
//Sequential mode
|
|
LayoutThread::solve_constraints(FlowRef::deref_mut(&mut root_flow), &shared)
|
|
}
|
|
});
|
|
}
|
|
|
|
profile(time::ProfilerCategory::LayoutStoreOverflow,
|
|
self.profiler_metadata(),
|
|
self.time_profiler_chan.clone(),
|
|
|| {
|
|
let context = LayoutContext::new(&shared);
|
|
sequential::store_overflow(&context,
|
|
FlowRef::deref_mut(&mut root_flow) as &mut Flow);
|
|
});
|
|
|
|
self.perform_post_main_layout_passes(data,
|
|
query_type,
|
|
document,
|
|
rw_data,
|
|
shared);
|
|
}
|
|
}
|
|
|
|
fn perform_post_main_layout_passes(&mut self,
|
|
data: &Reflow,
|
|
query_type: Option<&ReflowQueryType>,
|
|
document: Option<&ServoLayoutDocument>,
|
|
rw_data: &mut LayoutThreadData,
|
|
layout_context: &mut SharedLayoutContext) {
|
|
// Build the display list if necessary, and send it to the painter.
|
|
if let Some(mut root_flow) = self.root_flow.clone() {
|
|
self.compute_abs_pos_and_build_display_list(data,
|
|
query_type,
|
|
document,
|
|
FlowRef::deref_mut(&mut root_flow),
|
|
&mut *layout_context,
|
|
rw_data);
|
|
self.first_reflow = false;
|
|
|
|
if opts::get().trace_layout {
|
|
layout_debug::end_trace(self.generation);
|
|
}
|
|
|
|
if opts::get().dump_flow_tree {
|
|
root_flow.print("Post layout flow tree".to_owned());
|
|
}
|
|
|
|
self.generation += 1;
|
|
}
|
|
}
|
|
|
|
fn reflow_all_nodes(flow: &mut Flow) {
|
|
debug!("reflowing all nodes!");
|
|
flow::mut_base(flow).restyle_damage.insert(REPAINT | STORE_OVERFLOW | REFLOW);
|
|
|
|
for child in flow::child_iter_mut(flow) {
|
|
LayoutThread::reflow_all_nodes(child);
|
|
}
|
|
}
|
|
|
|
/// Returns profiling information which is passed to the time profiler.
|
|
fn profiler_metadata(&self) -> Option<TimerMetadata> {
|
|
Some(TimerMetadata {
|
|
url: self.url.to_string(),
|
|
iframe: if self.is_iframe {
|
|
TimerMetadataFrameType::IFrame
|
|
} else {
|
|
TimerMetadataFrameType::RootWindow
|
|
},
|
|
incremental: if self.first_reflow {
|
|
TimerMetadataReflowType::FirstReflow
|
|
} else {
|
|
TimerMetadataReflowType::Incremental
|
|
},
|
|
})
|
|
}
|
|
}
|
|
|
|
|
|
// The default computed value for background-color is transparent (see
|
|
// http://dev.w3.org/csswg/css-backgrounds/#background-color). However, we
|
|
// need to propagate the background color from the root HTML/Body
|
|
// element (http://dev.w3.org/csswg/css-backgrounds/#special-backgrounds) if
|
|
// it is non-transparent. The phrase in the spec "If the canvas background
|
|
// is not opaque, what shows through is UA-dependent." is handled by rust-layers
|
|
// clearing the frame buffer to white. This ensures that setting a background
|
|
// color on an iframe element, while the iframe content itself has a default
|
|
// transparent background color is handled correctly.
|
|
fn get_root_flow_background_color(flow: &mut Flow) -> webrender_traits::ColorF {
|
|
let transparent = webrender_traits::ColorF { r: 0.0, g: 0.0, b: 0.0, a: 0.0 };
|
|
if !flow.is_block_like() {
|
|
return transparent;
|
|
}
|
|
|
|
let block_flow = flow.as_mut_block();
|
|
let kid = match block_flow.base.children.iter_mut().next() {
|
|
None => return transparent,
|
|
Some(kid) => kid,
|
|
};
|
|
if !kid.is_block_like() {
|
|
return transparent;
|
|
}
|
|
|
|
let kid_block_flow = kid.as_block();
|
|
kid_block_flow.fragment
|
|
.style
|
|
.resolve_color(kid_block_flow.fragment.style.get_background().background_color)
|
|
.to_gfx_color()
|
|
}
|
|
|
|
fn get_ua_stylesheets() -> Result<UserAgentStylesheets, &'static str> {
|
|
fn parse_ua_stylesheet(filename: &'static str) -> Result<Stylesheet, &'static str> {
|
|
let res = try!(read_resource_file(filename).map_err(|_| filename));
|
|
Ok(Stylesheet::from_bytes(
|
|
&res,
|
|
ServoUrl::parse(&format!("chrome://resources/{:?}", filename)).unwrap(),
|
|
None,
|
|
None,
|
|
Origin::UserAgent,
|
|
Default::default(),
|
|
None,
|
|
Box::new(StdoutErrorReporter),
|
|
ParserContextExtraData::default()))
|
|
}
|
|
|
|
let mut user_or_user_agent_stylesheets = vec!();
|
|
// FIXME: presentational-hints.css should be at author origin with zero specificity.
|
|
// (Does it make a difference?)
|
|
for &filename in &["user-agent.css", "servo.css", "presentational-hints.css"] {
|
|
user_or_user_agent_stylesheets.push(try!(parse_ua_stylesheet(filename)));
|
|
}
|
|
for &(ref contents, ref url) in &opts::get().user_stylesheets {
|
|
user_or_user_agent_stylesheets.push(Stylesheet::from_bytes(
|
|
&contents, url.clone(), None, None, Origin::User, Default::default(),
|
|
None, Box::new(StdoutErrorReporter),
|
|
ParserContextExtraData::default()));
|
|
}
|
|
|
|
let quirks_mode_stylesheet = try!(parse_ua_stylesheet("quirks-mode.css"));
|
|
|
|
Ok(UserAgentStylesheets {
|
|
user_or_user_agent_stylesheets: user_or_user_agent_stylesheets,
|
|
quirks_mode_stylesheet: quirks_mode_stylesheet,
|
|
})
|
|
}
|
|
|
|
/// Returns true if the given reflow query type needs a full, up-to-date display list to be present
|
|
/// or false if it only needs stacking-relative positions.
|
|
fn reflow_query_type_needs_display_list(query_type: &ReflowQueryType) -> bool {
|
|
match *query_type {
|
|
ReflowQueryType::HitTestQuery(..) | ReflowQueryType::TextIndexQuery(..) => true,
|
|
ReflowQueryType::ContentBoxQuery(_) | ReflowQueryType::ContentBoxesQuery(_) |
|
|
ReflowQueryType::NodeGeometryQuery(_) | ReflowQueryType::NodeScrollGeometryQuery(_) |
|
|
ReflowQueryType::NodeOverflowQuery(_) | ReflowQueryType::NodeScrollRootIdQuery(_) |
|
|
ReflowQueryType::ResolvedStyleQuery(..) | ReflowQueryType::OffsetParentQuery(_) |
|
|
ReflowQueryType::MarginStyleQuery(_) | ReflowQueryType::NoQuery => false,
|
|
}
|
|
}
|
|
|
|
lazy_static! {
|
|
static ref UA_STYLESHEETS: UserAgentStylesheets = {
|
|
match get_ua_stylesheets() {
|
|
Ok(stylesheets) => stylesheets,
|
|
Err(filename) => {
|
|
error!("Failed to load UA stylesheet {}!", filename);
|
|
process::exit(1);
|
|
}
|
|
}
|
|
};
|
|
}
|