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Implemented Houdini worklets.
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34 changed files with 1209 additions and 17 deletions
143
components/script/dom/workletglobalscope.rs
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143
components/script/dom/workletglobalscope.rs
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/* 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 devtools_traits::ScriptToDevtoolsControlMsg;
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use dom::bindings::inheritance::Castable;
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use dom::bindings::js::Root;
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use dom::globalscope::GlobalScope;
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use dom::testworkletglobalscope::TestWorkletGlobalScope;
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use dom::testworkletglobalscope::TestWorkletTask;
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use dom_struct::dom_struct;
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use ipc_channel::ipc;
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use ipc_channel::ipc::IpcSender;
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use js::jsval::UndefinedValue;
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use js::rust::Runtime;
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use microtask::Microtask;
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use microtask::MicrotaskQueue;
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use msg::constellation_msg::PipelineId;
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use net_traits::ResourceThreads;
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use profile_traits::mem;
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use profile_traits::time;
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use script_traits::ScriptMsg;
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use script_traits::TimerSchedulerMsg;
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use servo_url::ImmutableOrigin;
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use servo_url::MutableOrigin;
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use servo_url::ServoUrl;
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#[dom_struct]
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/// https://drafts.css-houdini.org/worklets/#workletglobalscope
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pub struct WorkletGlobalScope {
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/// The global for this worklet.
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globalscope: GlobalScope,
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/// The base URL for this worklet.
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base_url: ServoUrl,
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/// The microtask queue for this worklet
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microtask_queue: MicrotaskQueue,
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}
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impl WorkletGlobalScope {
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/// Create a new stack-allocated `WorkletGlobalScope`.
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pub fn new_inherited(pipeline_id: PipelineId,
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base_url: ServoUrl,
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init: &WorkletGlobalScopeInit)
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-> WorkletGlobalScope {
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// Any timer events fired on this global are ignored.
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let (timer_event_chan, _) = ipc::channel().unwrap();
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WorkletGlobalScope {
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globalscope: GlobalScope::new_inherited(pipeline_id,
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init.devtools_chan.clone(),
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init.mem_profiler_chan.clone(),
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init.time_profiler_chan.clone(),
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init.constellation_chan.clone(),
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init.scheduler_chan.clone(),
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init.resource_threads.clone(),
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timer_event_chan,
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MutableOrigin::new(ImmutableOrigin::new_opaque())),
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base_url: base_url,
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microtask_queue: MicrotaskQueue::default(),
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}
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}
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/// Evaluate a JS script in this global.
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pub fn evaluate_js(&self, script: &str) -> bool {
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debug!("Evaluating JS.");
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rooted!(in (self.globalscope.get_cx()) let mut rval = UndefinedValue());
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self.globalscope.evaluate_js_on_global_with_result(&*script, rval.handle_mut())
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}
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/// The base URL of this global.
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pub fn base_url(&self) -> ServoUrl {
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self.base_url.clone()
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}
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/// Queue up a microtask to be executed in this global.
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pub fn enqueue_microtask(&self, job: Microtask) {
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self.microtask_queue.enqueue(job);
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}
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/// Perform any queued microtasks.
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pub fn perform_a_microtask_checkpoint(&self) {
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self.microtask_queue.checkpoint(|id| {
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let global = self.upcast::<GlobalScope>();
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assert_eq!(global.pipeline_id(), id);
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Some(Root::from_ref(global))
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});
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}
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/// Perform a worklet task
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pub fn perform_a_worklet_task(&self, task: WorkletTask) {
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match task {
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WorkletTask::Test(task) => match self.downcast::<TestWorkletGlobalScope>() {
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Some(global) => global.perform_a_worklet_task(task),
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None => warn!("This is not a test worklet."),
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},
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}
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}
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}
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/// Resources required by workletglobalscopes
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#[derive(Clone)]
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pub struct WorkletGlobalScopeInit {
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/// Channel to a resource thread
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pub resource_threads: ResourceThreads,
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/// Channel to the memory profiler
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pub mem_profiler_chan: mem::ProfilerChan,
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/// Channel to the time profiler
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pub time_profiler_chan: time::ProfilerChan,
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/// Channel to devtools
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pub devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
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/// Messages to send to constellation
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pub constellation_chan: IpcSender<ScriptMsg>,
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/// Message to send to the scheduler
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pub scheduler_chan: IpcSender<TimerSchedulerMsg>,
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}
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/// https://drafts.css-houdini.org/worklets/#worklet-global-scope-type
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#[derive(Clone, Copy, Debug, HeapSizeOf, JSTraceable)]
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pub enum WorkletGlobalScopeType {
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/// https://drafts.css-houdini.org/worklets/#examples
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Test,
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}
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impl WorkletGlobalScopeType {
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/// Create a new heap-allocated `WorkletGlobalScope`.
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pub fn new(&self,
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runtime: &Runtime,
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pipeline_id: PipelineId,
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base_url: ServoUrl,
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init: &WorkletGlobalScopeInit)
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-> Root<WorkletGlobalScope>
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{
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match *self {
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WorkletGlobalScopeType::Test =>
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Root::upcast(TestWorkletGlobalScope::new(runtime, pipeline_id, base_url, init)),
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}
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}
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}
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/// A task which can be performed in the context of a worklet global.
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pub enum WorkletTask {
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Test(TestWorkletTask),
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}
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