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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/. */
//! Infrastructure to initiate network requests for images needed by the layout
//! thread. The script thread needs to be responsible for them because there's
//! no guarantee that the responsible nodes will still exist in the future if the
//! layout thread holds on to them during asynchronous operations.
use dom::bindings::reflector::DomObject;
use dom::node::{Node, document_from_node};
use ipc_channel::ipc;
use ipc_channel::router::ROUTER;
use net_traits::{FetchResponseMsg, FetchResponseListener, FetchMetadata, NetworkError};
use net_traits::image_cache::{ImageCache, PendingImageId};
use net_traits::request::{Destination, RequestInit as FetchRequestInit};
use network_listener::{NetworkListener, PreInvoke};
use servo_url::ServoUrl;
use std::sync::{Arc, Mutex};
struct LayoutImageContext {
id: PendingImageId,
cache: Arc<ImageCache>,
}
impl FetchResponseListener for LayoutImageContext {
fn process_request_body(&mut self) {}
fn process_request_eof(&mut self) {}
fn process_response(&mut self, metadata: Result<FetchMetadata, NetworkError>) {
self.cache.notify_pending_response(
self.id,
FetchResponseMsg::ProcessResponse(metadata));
}
fn process_response_chunk(&mut self, payload: Vec<u8>) {
self.cache.notify_pending_response(
self.id,
FetchResponseMsg::ProcessResponseChunk(payload));
}
fn process_response_eof(&mut self, response: Result<(), NetworkError>) {
self.cache.notify_pending_response(self.id,
FetchResponseMsg::ProcessResponseEOF(response));
}
}
impl PreInvoke for LayoutImageContext {}
pub fn fetch_image_for_layout(url: ServoUrl,
node: &Node,
id: PendingImageId,
cache: Arc<ImageCache>) {
let context = Arc::new(Mutex::new(LayoutImageContext {
id: id,
cache: cache,
}));
let document = document_from_node(node);
let window = document.window();
let (action_sender, action_receiver) = ipc::channel().unwrap();
let listener = NetworkListener {
context: context,
task_source: window.networking_task_source(),
canceller: Some(window.task_canceller()),
};
ROUTER.add_route(action_receiver.to_opaque(), Box::new(move |message| {
listener.notify_fetch(message.to().unwrap());
}));
let request = FetchRequestInit {
url: url,
origin: document.origin().immutable().clone(),
destination: Destination::Image,
pipeline_id: Some(document.global().pipeline_id()),
.. FetchRequestInit::default()
};
// Layout image loads do not delay the document load event.
document.loader().fetch_async_background(request, action_sender);
}
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