script/dom/window/
layout_image.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5//! Infrastructure to initiate network requests for images needed by layout. The script thread needs
6//! to be responsible for them because there's no guarantee that the responsible nodes will still
7//! exist in the future if layout holds on to them during asynchronous operations.
8
9use std::sync::Arc;
10
11use bytes::Bytes;
12use net_traits::blob_url_store::UrlWithBlobClaim;
13use net_traits::image_cache::{ImageCache, PendingImageId};
14use net_traits::request::{Destination, InternalRequest, RequestBuilder, RequestId};
15use net_traits::{FetchMetadata, FetchResponseMsg, NetworkError, ResourceFetchTiming};
16use servo_url::ServoUrl;
17
18use crate::dom::bindings::refcounted::Trusted;
19use crate::dom::csp::{GlobalCspReporting, Violation};
20use crate::dom::document::Document;
21use crate::dom::globalscope::GlobalScope;
22use crate::dom::node::{Node, NodeTraits};
23use crate::dom::performance::performanceresourcetiming::InitiatorType;
24use crate::event_loop::document_loader::LoadType;
25use crate::fetch::fetch::RequestWithGlobalScope;
26use crate::fetch::network_listener::{self, FetchResponseListener, ResourceTimingListener};
27
28struct LayoutImageContext {
29    id: PendingImageId,
30    cache: Arc<dyn ImageCache>,
31    doc: Trusted<Document>,
32    url: ServoUrl,
33}
34
35impl FetchResponseListener for LayoutImageContext {
36    fn process_request_body(&mut self, _: &GlobalScope, _: RequestId) {}
37    fn process_response(
38        &mut self,
39        _: &mut js::context::JSContext,
40        _: &GlobalScope,
41        request_id: RequestId,
42        metadata: Result<FetchMetadata, NetworkError>,
43    ) {
44        self.cache.notify_pending_response(
45            self.id,
46            FetchResponseMsg::ProcessResponse(request_id, metadata),
47        );
48    }
49
50    fn process_response_chunk(
51        &mut self,
52        _: &mut js::context::JSContext,
53        _: &GlobalScope,
54        request_id: RequestId,
55        payload: Bytes,
56    ) {
57        self.cache.notify_pending_response(
58            self.id,
59            FetchResponseMsg::ProcessResponseChunk(request_id, payload),
60        );
61    }
62
63    fn process_response_eof(
64        self,
65        cx: &mut js::context::JSContext,
66        global: &GlobalScope,
67        request_id: RequestId,
68        response: Result<(), NetworkError>,
69        timing: ResourceFetchTiming,
70    ) {
71        self.cache.notify_pending_response(
72            self.id,
73            FetchResponseMsg::ProcessResponseEOF(request_id, response.clone(), timing.clone()),
74        );
75        network_listener::submit_timing(cx, global, &self, &response, &timing);
76        self.doc.root().finish_load(LoadType::Image(self.url), cx);
77    }
78
79    fn process_csp_violations(
80        &mut self,
81        cx: &mut js::context::JSContext,
82        global: &GlobalScope,
83        _request_id: RequestId,
84        violations: Vec<Violation>,
85    ) {
86        global.report_csp_violations(cx, violations, None, None);
87    }
88
89    fn process_content_length(&mut self, request_id: RequestId, size: usize) {
90        self.cache.notify_pending_response(
91            self.id,
92            FetchResponseMsg::ProcessContentLength(request_id, size),
93        );
94    }
95}
96
97impl ResourceTimingListener for LayoutImageContext {
98    fn resource_timing_information(&self) -> (InitiatorType, ServoUrl) {
99        (InitiatorType::Css, self.url.clone())
100    }
101}
102
103pub(crate) fn fetch_image_for_layout(
104    url: ServoUrl,
105    node: &Node,
106    id: PendingImageId,
107    is_internal_request: InternalRequest,
108    cache: Arc<dyn ImageCache>,
109) {
110    let document = node.owner_document();
111    let context = LayoutImageContext {
112        id,
113        cache,
114        doc: Trusted::new(&document),
115        url: url.clone(),
116    };
117
118    let global = node.owner_global();
119    let request = RequestBuilder::new(
120        Some(document.webview_id()),
121        UrlWithBlobClaim::from_url_without_having_claimed_blob(url.clone()),
122        global.get_referrer(),
123    )
124    .destination(Destination::Image)
125    .is_internal_request(is_internal_request)
126    .with_global_scope(&global);
127
128    // Even though https://github.com/w3c/csswg-drafts/issues/1088 has not been resolved,
129    // if we don't make this blocking we experience a lot of flakiness in WPT tests. These
130    // tests generally assume that `background-image` loads block the document load event.
131    // Hence we match other browsers behavior and make all of such fetches blocking.
132    document.fetch_blocking(LoadType::Image(url), request, context);
133}
script/dom/window/layout_image.rs

script/dom/window/
layout_image.rs
