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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 devtools_traits::ScriptToDevtoolsControlMsg;
use dom::bindings::inheritance::Castable;
use dom::bindings::root::DomRoot;
use dom::globalscope::GlobalScope;
use dom::paintworkletglobalscope::PaintWorkletGlobalScope;
use dom::paintworkletglobalscope::PaintWorkletTask;
use dom::testworkletglobalscope::TestWorkletGlobalScope;
use dom::testworkletglobalscope::TestWorkletTask;
use dom::worklet::WorkletExecutor;
use dom_struct::dom_struct;
use ipc_channel::ipc;
use ipc_channel::ipc::IpcSender;
use js::jsapi::JSContext;
use js::jsval::UndefinedValue;
use js::rust::Runtime;
use msg::constellation_msg::PipelineId;
use net_traits::ResourceThreads;
use net_traits::image_cache::ImageCache;
use profile_traits::mem;
use profile_traits::time;
use script_thread::MainThreadScriptMsg;
use script_traits::{Painter, ScriptMsg};
use script_traits::{ScriptToConstellationChan, TimerSchedulerMsg};
use servo_atoms::Atom;
use servo_url::ImmutableOrigin;
use servo_url::MutableOrigin;
use servo_url::ServoUrl;
use std::sync::Arc;
use std::sync::mpsc::Sender;
#[dom_struct]
/// <https://drafts.css-houdini.org/worklets/#workletglobalscope>
pub struct WorkletGlobalScope {
/// The global for this worklet.
globalscope: GlobalScope,
/// The base URL for this worklet.
base_url: ServoUrl,
/// Sender back to the script thread
#[ignore_heap_size_of = "channels are hard"]
to_script_thread_sender: Sender<MainThreadScriptMsg>,
/// Worklet task executor
executor: WorkletExecutor,
}
impl WorkletGlobalScope {
/// Create a new stack-allocated `WorkletGlobalScope`.
pub fn new_inherited(
pipeline_id: PipelineId,
base_url: ServoUrl,
executor: WorkletExecutor,
init: &WorkletGlobalScopeInit,
) -> Self {
// Any timer events fired on this global are ignored.
let (timer_event_chan, _) = ipc::channel().unwrap();
let script_to_constellation_chan = ScriptToConstellationChan {
sender: init.to_constellation_sender.clone(),
pipeline_id,
};
Self {
globalscope: GlobalScope::new_inherited(
pipeline_id,
init.devtools_chan.clone(),
init.mem_profiler_chan.clone(),
init.time_profiler_chan.clone(),
script_to_constellation_chan,
init.scheduler_chan.clone(),
init.resource_threads.clone(),
timer_event_chan,
MutableOrigin::new(ImmutableOrigin::new_opaque()),
Default::default(),
),
base_url,
to_script_thread_sender: init.to_script_thread_sender.clone(),
executor,
}
}
/// Get the JS context.
pub fn get_cx(&self) -> *mut JSContext {
self.globalscope.get_cx()
}
/// Evaluate a JS script in this global.
pub fn evaluate_js(&self, script: &str) -> bool {
debug!("Evaluating Dom.");
rooted!(in (self.globalscope.get_cx()) let mut rval = UndefinedValue());
self.globalscope.evaluate_js_on_global_with_result(&*script, rval.handle_mut())
}
/// Register a paint worklet to the script thread.
pub fn register_paint_worklet(
&self,
name: Atom,
properties: Vec<Atom>,
painter: Box<Painter>,
) {
self.to_script_thread_sender
.send(MainThreadScriptMsg::RegisterPaintWorklet {
pipeline_id: self.globalscope.pipeline_id(),
name,
properties,
painter,
})
.expect("Worklet thread outlived script thread.");
}
/// The base URL of this global.
pub fn base_url(&self) -> ServoUrl {
self.base_url.clone()
}
/// The worklet executor.
pub fn executor(&self) -> WorkletExecutor {
self.executor.clone()
}
/// Perform a worklet task
pub fn perform_a_worklet_task(&self, task: WorkletTask) {
match task {
WorkletTask::Test(task) => match self.downcast::<TestWorkletGlobalScope>() {
Some(global) => global.perform_a_worklet_task(task),
None => warn!("This is not a test worklet."),
},
WorkletTask::Paint(task) => match self.downcast::<PaintWorkletGlobalScope>() {
Some(global) => global.perform_a_worklet_task(task),
None => warn!("This is not a paint worklet."),
},
}
}
}
/// Resources required by workletglobalscopes
#[derive(Clone)]
pub struct WorkletGlobalScopeInit {
/// Channel to the main script thread
pub to_script_thread_sender: Sender<MainThreadScriptMsg>,
/// Channel to a resource thread
pub resource_threads: ResourceThreads,
/// Channel to the memory profiler
pub mem_profiler_chan: mem::ProfilerChan,
/// Channel to the time profiler
pub time_profiler_chan: time::ProfilerChan,
/// Channel to devtools
pub devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
/// Messages to send to constellation
pub to_constellation_sender: IpcSender<(PipelineId, ScriptMsg)>,
/// Message to send to the scheduler
pub scheduler_chan: IpcSender<TimerSchedulerMsg>,
/// The image cache
pub image_cache: Arc<ImageCache>,
}
/// <https://drafts.css-houdini.org/worklets/#worklet-global-scope-type>
#[derive(Clone, Copy, Debug, HeapSizeOf, JSTraceable)]
pub enum WorkletGlobalScopeType {
/// A servo-specific testing worklet
Test,
/// A paint worklet
Paint,
}
impl WorkletGlobalScopeType {
/// Create a new heap-allocated `WorkletGlobalScope`.
pub fn new(&self,
runtime: &Runtime,
pipeline_id: PipelineId,
base_url: ServoUrl,
executor: WorkletExecutor,
init: &WorkletGlobalScopeInit)
-> DomRoot<WorkletGlobalScope>
{
match *self {
WorkletGlobalScopeType::Test =>
DomRoot::upcast(TestWorkletGlobalScope::new(runtime, pipeline_id, base_url, executor, init)),
WorkletGlobalScopeType::Paint =>
DomRoot::upcast(PaintWorkletGlobalScope::new(runtime, pipeline_id, base_url, executor, init)),
}
}
}
/// A task which can be performed in the context of a worklet global.
pub enum WorkletTask {
Test(TestWorkletTask),
Paint(PaintWorkletTask),
}
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