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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 CompositorChan;
use layout_traits::{LayoutTaskFactory, LayoutControlChan};
use script_traits::{ScriptControlChan, ScriptTaskFactory};
use script_traits::{AttachLayoutMsg, LoadMsg, NewLayoutInfo, ExitPipelineMsg};
use gfx::render_task::{PaintPermissionGranted, PaintPermissionRevoked};
use gfx::render_task::{RenderChan, RenderTask};
use servo_msg::constellation_msg::{ConstellationChan, Failure, PipelineId, SubpageId};
use servo_msg::constellation_msg::WindowSizeData;
use servo_net::image_cache_task::ImageCacheTask;
use gfx::font_cache_task::FontCacheTask;
use servo_net::resource_task::ResourceTask;
use servo_util::opts::Opts;
use servo_util::time::TimeProfilerChan;
use std::rc::Rc;
use url::Url;
/// A uniquely-identifiable pipeline of script task, layout task, and render task.
pub struct Pipeline {
pub id: PipelineId,
pub subpage_id: Option<SubpageId>,
pub script_chan: ScriptControlChan,
pub layout_chan: LayoutControlChan,
pub render_chan: RenderChan,
pub layout_shutdown_port: Receiver<()>,
pub render_shutdown_port: Receiver<()>,
/// The most recently loaded url
pub url: Url,
}
/// The subset of the pipeline that is needed for layer composition.
#[deriving(Clone)]
pub struct CompositionPipeline {
pub id: PipelineId,
pub script_chan: ScriptControlChan,
pub render_chan: RenderChan,
}
impl Pipeline {
/// Starts a render task, layout task, and possibly a script task.
/// Returns the channels wrapped in a struct.
/// If script_pipeline is not None, then subpage_id must also be not None.
pub fn create<LTF:LayoutTaskFactory, STF:ScriptTaskFactory>(
id: PipelineId,
subpage_id: Option<SubpageId>,
constellation_chan: ConstellationChan,
compositor_chan: CompositorChan,
image_cache_task: ImageCacheTask,
font_cache_task: FontCacheTask,
resource_task: ResourceTask,
time_profiler_chan: TimeProfilerChan,
window_size: WindowSizeData,
opts: Opts,
script_pipeline: Option<Rc<Pipeline>>,
url: Url)
-> Pipeline {
let layout_pair = ScriptTaskFactory::create_layout_channel(None::<&mut STF>);
let (render_port, render_chan) = RenderChan::new();
let (render_shutdown_chan, render_shutdown_port) = channel();
let (layout_shutdown_chan, layout_shutdown_port) = channel();
let (pipeline_chan, pipeline_port) = channel();
let failure = Failure {
pipeline_id: id,
subpage_id: subpage_id,
};
let script_chan = match script_pipeline {
None => {
let (script_chan, script_port) = channel();
ScriptTaskFactory::create(None::<&mut STF>,
id,
box compositor_chan.clone(),
&layout_pair,
ScriptControlChan(script_chan.clone()),
script_port,
constellation_chan.clone(),
failure.clone(),
resource_task,
image_cache_task.clone(),
window_size);
ScriptControlChan(script_chan)
}
Some(spipe) => {
let new_layout_info = NewLayoutInfo {
old_pipeline_id: spipe.id.clone(),
new_pipeline_id: id,
subpage_id: subpage_id.expect("script_pipeline != None but subpage_id == None"),
layout_chan: ScriptTaskFactory::clone_layout_channel(None::<&mut STF>, &layout_pair),
};
let ScriptControlChan(ref chan) = spipe.script_chan;
chan.send(AttachLayoutMsg(new_layout_info));
spipe.script_chan.clone()
}
};
RenderTask::create(id,
render_port,
compositor_chan.clone(),
constellation_chan.clone(),
font_cache_task.clone(),
failure.clone(),
opts.clone(),
time_profiler_chan.clone(),
render_shutdown_chan);
LayoutTaskFactory::create(None::<&mut LTF>,
id,
layout_pair,
pipeline_port,
constellation_chan,
failure,
script_chan.clone(),
render_chan.clone(),
image_cache_task,
font_cache_task,
opts.clone(),
time_profiler_chan,
layout_shutdown_chan);
Pipeline::new(id,
subpage_id,
script_chan,
LayoutControlChan(pipeline_chan),
render_chan,
layout_shutdown_port,
render_shutdown_port,
url)
}
pub fn new(id: PipelineId,
subpage_id: Option<SubpageId>,
script_chan: ScriptControlChan,
layout_chan: LayoutControlChan,
render_chan: RenderChan,
layout_shutdown_port: Receiver<()>,
render_shutdown_port: Receiver<()>,
url: Url)
-> Pipeline {
Pipeline {
id: id,
subpage_id: subpage_id,
script_chan: script_chan,
layout_chan: layout_chan,
render_chan: render_chan,
layout_shutdown_port: layout_shutdown_port,
render_shutdown_port: render_shutdown_port,
url: url,
}
}
pub fn load(&self) {
let ScriptControlChan(ref chan) = self.script_chan;
chan.send(LoadMsg(self.id, self.url.clone()));
}
pub fn grant_paint_permission(&self) {
let _ = self.render_chan.send_opt(PaintPermissionGranted);
}
pub fn revoke_paint_permission(&self) {
debug!("pipeline revoking render channel paint permission");
let _ = self.render_chan.send_opt(PaintPermissionRevoked);
}
pub fn exit(&self) {
debug!("pipeline {:?} exiting", self.id);
// Script task handles shutting down layout, and layout handles shutting down the renderer.
// For now, if the script task has failed, we give up on clean shutdown.
let ScriptControlChan(ref chan) = self.script_chan;
if chan.send_opt(ExitPipelineMsg(self.id)).is_ok() {
// Wait until all slave tasks have terminated and run destructors
// NOTE: We don't wait for script task as we don't always own it
let _ = self.render_shutdown_port.recv_opt();
let _ = self.layout_shutdown_port.recv_opt();
}
}
pub fn to_sendable(&self) -> CompositionPipeline {
CompositionPipeline {
id: self.id.clone(),
script_chan: self.script_chan.clone(),
render_chan: self.render_chan.clone(),
}
}
}
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