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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 compositing::*;
use geom::size::Size2D;
use servo_msg::constellation_msg::{ConstellationChan, ExitMsg, ResizedWindowMsg};
use std::comm::{Empty, Disconnected, Data, Receiver};
use servo_util::time::ProfilerChan;
use servo_util::time;
/// Starts the compositor, which listens for messages on the specified port.
///
/// This is the null compositor which doesn't draw anything to the screen.
/// It's intended for headless testing.
pub struct NullCompositor {
/// The port on which we receive messages.
pub port: Receiver<Msg>,
}
impl NullCompositor {
fn new(port: Receiver<Msg>) -> NullCompositor {
NullCompositor {
port: port,
}
}
pub fn create(port: Receiver<Msg>,
constellation_chan: ConstellationChan,
profiler_chan: ProfilerChan) {
let compositor = NullCompositor::new(port);
// Tell the constellation about the initial fake size.
{
let ConstellationChan(ref chan) = constellation_chan;
chan.send(ResizedWindowMsg(Size2D(640u, 480u)));
}
compositor.handle_message(constellation_chan);
// Drain compositor port, sometimes messages contain channels that are blocking
// another task from finishing (i.e. SetIds)
loop {
match compositor.port.try_recv() {
Empty | Disconnected => break,
Data(_) => {},
}
}
profiler_chan.send(time::ExitMsg);
}
fn handle_message(&self, constellation_chan: ConstellationChan) {
loop {
match self.port.recv() {
Exit(chan) => {
debug!("shutting down the constellation");
let ConstellationChan(ref con_chan) = constellation_chan;
con_chan.send(ExitMsg);
chan.send(());
}
ShutdownComplete => {
debug!("constellation completed shutdown");
break
}
GetGraphicsMetadata(chan) => {
chan.send(None);
}
SetIds(_, response_chan, _) => {
response_chan.send(());
}
// Explicitly list ignored messages so that when we add a new one,
// we'll notice and think about whether it needs a response, like
// SetIds.
CreateRootCompositorLayerIfNecessary(..) |
CreateDescendantCompositorLayerIfNecessary(..) | SetLayerPageSize(..) |
SetLayerClipRect(..) | DeleteLayerGroup(..) | Paint(..) |
ChangeReadyState(..) | ChangeRenderState(..) | ScrollFragmentPoint(..) |
SetUnRenderedColor(..) | LoadComplete(..) => ()
}
}
}
}
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