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c890c9143c
In support of this goal, the layout thread collects information about CSS images that are missing image data and hands it off to the script thread after layout completes. The script thread stores a list of nodes that will need to be reflowed after the associated network request is complete. The script thread ensures that the nodes are not GCed while a request is ongoing, which the layout thread is incapable of guaranteeing. The image cache's API has also been redesigned in support of this work. No network requests are made by the new image cache, since it does not possess the document-specific information necessary to initiate them. Instead, there is now a single, synchronous query operation that optionally reserves a slot when a cache entry for a URL cannot be found. This reserved slot is then the responsibility of the queryer to populate with the contents of the network response for the URL once it is complete. Any subsequent queries for the same URL will be informed that the response is pending until that occurs. The changes to layout also remove the synchronous image loading code path, which means that reftests now test the same code that non-test binaries execute. The decision to take a screenshot now considers whether there are any outstanding image requests for layout in order to avoid intermittent failures in reftests that use CSS images.
101 lines
3.7 KiB
Rust
101 lines
3.7 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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use PendingImage;
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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 gfx_traits::ScrollRootId;
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use script_traits::UntrustedNodeAddress;
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use style::properties::longhands::{margin_top, margin_right, margin_bottom, margin_left, overflow_x};
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/// Synchronous messages that script can send to layout.
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///
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/// In general, you should use messages to talk to Layout. Use the RPC interface
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/// if and only if the work is
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///
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/// 1) read-only with respect to LayoutThreadData,
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/// 2) small,
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/// 3) and really needs to be fast.
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pub trait LayoutRPC {
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/// Requests the dimensions of the content box, as in the `getBoundingClientRect()` call.
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fn content_box(&self) -> ContentBoxResponse;
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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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/// Requests the geometry of this node. Used by APIs such as `clientTop`.
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fn node_geometry(&self) -> NodeGeometryResponse;
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/// Requests the overflow-x and overflow-y of this node. Used by `scrollTop` etc.
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fn node_overflow(&self) -> NodeOverflowResponse;
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/// Requests the scroll geometry of this node. Used by APIs such as `scrollTop`.
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fn node_scroll_area(&self) -> NodeGeometryResponse;
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/// Requests the scroll root id of this node. Used by APIs such as `scrollTop`
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fn node_scroll_root_id(&self) -> NodeScrollRootIdResponse;
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/// Requests the node containing the point of interest
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fn hit_test(&self) -> HitTestResponse;
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/// Query layout for the resolved value of a given CSS property
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fn resolved_style(&self) -> ResolvedStyleResponse;
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fn offset_parent(&self) -> OffsetParentResponse;
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/// Query layout for the resolve values of the margin properties for an element.
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fn margin_style(&self) -> MarginStyleResponse;
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/// Requests the list of not-yet-loaded images that were encountered in the last reflow.
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fn pending_images(&self) -> Vec<PendingImage>;
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fn nodes_from_point(&self, page_point: Point2D<f32>, client_point: Point2D<f32>) -> Vec<UntrustedNodeAddress>;
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fn text_index(&self) -> TextIndexResponse;
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}
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pub struct ContentBoxResponse(pub Option<Rect<Au>>);
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pub struct ContentBoxesResponse(pub Vec<Rect<Au>>);
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pub struct NodeGeometryResponse {
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pub client_rect: Rect<i32>,
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}
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pub struct NodeOverflowResponse(pub Option<Point2D<overflow_x::computed_value::T>>);
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pub struct NodeScrollRootIdResponse(pub ScrollRootId);
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pub struct HitTestResponse {
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pub node_address: Option<UntrustedNodeAddress>,
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}
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pub struct ResolvedStyleResponse(pub String);
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#[derive(Clone)]
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pub struct OffsetParentResponse {
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pub node_address: Option<UntrustedNodeAddress>,
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pub rect: Rect<Au>,
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}
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impl OffsetParentResponse {
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pub fn empty() -> OffsetParentResponse {
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OffsetParentResponse {
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node_address: None,
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rect: Rect::zero(),
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}
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}
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}
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#[derive(Clone)]
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pub struct MarginStyleResponse {
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pub top: margin_top::computed_value::T,
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pub right: margin_right::computed_value::T,
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pub bottom: margin_bottom::computed_value::T,
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pub left: margin_left::computed_value::T,
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}
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impl MarginStyleResponse {
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pub fn empty() -> MarginStyleResponse {
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MarginStyleResponse {
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top: margin_top::computed_value::T::Auto,
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right: margin_right::computed_value::T::Auto,
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bottom: margin_bottom::computed_value::T::Auto,
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left: margin_left::computed_value::T::Auto,
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}
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}
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}
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#[derive(Clone)]
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pub struct TextIndexResponse(pub Option<usize>);
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