1 files changed, 148 insertions, 0 deletions
diff --git a/components/script_layout_interface/message.rs b/components/script_layout_interface/message.rs
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+++ b/components/script_layout_interface/message.rs
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+use app_units::Au;
+use euclid::point::Point2D;
+use euclid::rect::Rect;
+use gfx_traits::{Epoch, LayerId};
+use ipc_channel::ipc::{IpcReceiver, IpcSender};
+use msg::constellation_msg::{PanicMsg, PipelineId, WindowSizeData};
+use net_traits::image_cache_thread::ImageCacheThread;
+use profile_traits::mem::ReportsChan;
+use rpc::LayoutRPC;
+use script_traits::{ConstellationControlMsg, LayoutControlMsg};
+use script_traits::{LayoutMsg as ConstellationMsg, StackingContextScrollState};
+use std::sync::Arc;
+use std::sync::mpsc::{Receiver, Sender};
+use string_cache::Atom;
+use style::context::ReflowGoal;
+use style::selector_impl::PseudoElement;
+use style::servo::Stylesheet;
+use url::Url;
+use util::ipc::OptionalOpaqueIpcSender;
+use {OpaqueStyleAndLayoutData, TrustedNodeAddress};
+
+/// Asynchronous messages that script can send to layout.
+pub enum Msg {
+    /// Adds the given stylesheet to the document.
+    AddStylesheet(Arc<Stylesheet>),
+
+    /// Puts a document into quirks mode, causing the quirks mode stylesheet to be loaded.
+    SetQuirksMode,
+
+    /// Requests a reflow.
+    Reflow(ScriptReflow),
+
+    /// Get an RPC interface.
+    GetRPC(Sender<Box<LayoutRPC + Send>>),
+
+    /// Requests that the layout thread render the next frame of all animations.
+    TickAnimations,
+
+    /// Requests that the layout thread reflow with a newly-loaded Web font.
+    ReflowWithNewlyLoadedWebFont,
+
+    /// Updates the layout visible rects, affecting the area that display lists will be constructed
+    /// for.
+    SetVisibleRects(Vec<(LayerId, Rect<Au>)>),
+
+    /// Destroys layout data associated with a DOM node.
+    ///
+    /// TODO(pcwalton): Maybe think about batching to avoid message traffic.
+    ReapStyleAndLayoutData(OpaqueStyleAndLayoutData),
+
+    /// Requests that the layout thread measure its memory usage. The resulting reports are sent back
+    /// via the supplied channel.
+    CollectReports(ReportsChan),
+
+    /// Requests that the layout thread enter a quiescent state in which no more messages are
+    /// accepted except `ExitMsg`. A response message will be sent on the supplied channel when
+    /// this happens.
+    PrepareToExit(Sender<()>),
+
+    /// Requests that the layout thread immediately shut down. There must be no more nodes left after
+    /// this, or layout will crash.
+    ExitNow,
+
+    /// Get the last epoch counter for this layout thread.
+    GetCurrentEpoch(IpcSender<Epoch>),
+
+    /// Asks the layout thread whether any Web fonts have yet to load (if true, loads are pending;
+    /// false otherwise).
+    GetWebFontLoadState(IpcSender<bool>),
+
+    /// Creates a new layout thread.
+    ///
+    /// This basically exists to keep the script-layout dependency one-way.
+    CreateLayoutThread(NewLayoutThreadInfo),
+
+    /// Set the final Url.
+    SetFinalUrl(Url),
+
+    /// Tells layout about the new scrolling offsets of each scrollable stacking context.
+    SetStackingContextScrollStates(Vec<StackingContextScrollState>),
+}
+
+
+/// Any query to perform with this reflow.
+#[derive(PartialEq)]
+pub enum ReflowQueryType {
+    NoQuery,
+    ContentBoxQuery(TrustedNodeAddress),
+    ContentBoxesQuery(TrustedNodeAddress),
+    NodeOverflowQuery(TrustedNodeAddress),
+    HitTestQuery(Point2D<f32>, bool),
+    NodeGeometryQuery(TrustedNodeAddress),
+    NodeLayerIdQuery(TrustedNodeAddress),
+    NodeScrollGeometryQuery(TrustedNodeAddress),
+    ResolvedStyleQuery(TrustedNodeAddress, Option<PseudoElement>, Atom),
+    OffsetParentQuery(TrustedNodeAddress),
+    MarginStyleQuery(TrustedNodeAddress),
+}
+
+/// Information needed for a reflow.
+pub struct Reflow {
+    /// The goal of reflow: either to render to the screen or to flush layout info for script.
+    pub goal: ReflowGoal,
+    ///  A clipping rectangle for the page, an enlarged rectangle containing the viewport.
+    pub page_clip_rect: Rect<Au>,
+}
+
+/// Information needed for a script-initiated reflow.
+pub struct ScriptReflow {
+    /// General reflow data.
+    pub reflow_info: Reflow,
+    /// The document node.
+    pub document: TrustedNodeAddress,
+    /// The document's list of stylesheets.
+    pub document_stylesheets: Vec<Arc<Stylesheet>>,
+    /// Whether the document's stylesheets have changed since the last script reflow.
+    pub stylesheets_changed: bool,
+    /// The current window size.
+    pub window_size: WindowSizeData,
+    /// The channel that we send a notification to.
+    pub script_join_chan: Sender<()>,
+    /// The type of query if any to perform during this reflow.
+    pub query_type: ReflowQueryType,
+}
+
+impl Drop for ScriptReflow {
+    fn drop(&mut self) {
+        self.script_join_chan.send(()).unwrap();
+    }
+}
+
+pub struct NewLayoutThreadInfo {
+    pub id: PipelineId,
+    pub url: Url,
+    pub is_parent: bool,
+    pub layout_pair: (Sender<Msg>, Receiver<Msg>),
+    pub pipeline_port: IpcReceiver<LayoutControlMsg>,
+    pub constellation_chan: IpcSender<ConstellationMsg>,
+    pub panic_chan: IpcSender<PanicMsg>,
+    pub script_chan: IpcSender<ConstellationControlMsg>,
+    pub image_cache_thread: ImageCacheThread,
+    pub paint_chan: OptionalOpaqueIpcSender,
+    pub content_process_shutdown_chan: IpcSender<()>,
+}