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Merge pull request #2767 from zwarich/shutdown-state

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Add a ShutdownState type in the compositor
This commit is contained in:
Patrick Walton 2014-07-07 13:49:55 -07:00
commit 1624bc2e59
1 changed files with 36 additions and 27 deletions
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63
src/components/compositing/compositor.rs
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@ -85,11 +85,9 @@ pub struct IOCompositor {
/// Tracks whether the renderer has finished its first rendering
composite_ready: bool,
/// Tracks whether we are in the process of shutting down.
shutting_down: bool,
/// Tracks whether we should close compositor.
done: bool,
/// Tracks whether we are in the process of shutting down, or have shut down and should close
/// the compositor.
shutdown_state: ShutdownState,
/// Tracks whether we need to re-composite a page.
recomposite: bool,
@ -124,6 +122,13 @@ pub struct IOCompositor {
fragment_point: Option<Point2D<f32>>
}
#[deriving(PartialEq)]
enum ShutdownState {
NotShuttingDown,
ShuttingDown,
FinishedShuttingDown,
}
impl IOCompositor {
fn new(app: &Application,
opts: Opts,
@ -151,8 +156,7 @@ impl IOCompositor {
hidpi_factor: hidpi_factor,
graphics_context: CompositorTask::create_graphics_context(),
composite_ready: false,
shutting_down: false,
done: false,
shutdown_state: NotShuttingDown,
recomposite: false,
page_zoom: ScaleFactor(1.0),
viewport_zoom: ScaleFactor(1.0),
@ -190,11 +194,11 @@ impl IOCompositor {
self.send_window_size();
// Enter the main event loop.
while !self.done {
while self.shutdown_state != FinishedShuttingDown {
// Check for new messages coming from the rendering task.
self.handle_message();
if self.done {
if self.shutdown_state == FinishedShuttingDown {
// We have exited the compositor and passing window
// messages to script may crash.
debug!("Exiting the compositor due to a request from script.");
@ -246,7 +250,10 @@ impl IOCompositor {
fn handle_message(&mut self) {
loop {
match (self.port.try_recv(), self.shutting_down) {
match (self.port.try_recv(), self.shutdown_state) {
(_, FinishedShuttingDown) =>
fail!("compositor shouldn't be handling messages after shutting down"),
(Err(_), _) => break,
(Ok(Exit(chan)), _) => {
@ -254,24 +261,25 @@ impl IOCompositor {
let ConstellationChan(ref con_chan) = self.constellation_chan;
con_chan.send(ExitMsg);
chan.send(());
self.shutting_down = true;
self.shutdown_state = ShuttingDown;
}
(Ok(ShutdownComplete), _) => {
debug!("constellation completed shutdown");
self.done = true;
self.shutdown_state = FinishedShuttingDown;
break;
}
(Ok(ChangeReadyState(ready_state)), false) => {
(Ok(ChangeReadyState(ready_state)), NotShuttingDown) => {
self.window.set_ready_state(ready_state);
self.ready_state = ready_state;
}
(Ok(ChangeRenderState(render_state)), false) => {
(Ok(ChangeRenderState(render_state)), NotShuttingDown) => {
self.change_render_state(render_state);
}
(Ok(SetUnRenderedColor(pipeline_id, layer_id, color)), false) => {
(Ok(SetUnRenderedColor(pipeline_id, layer_id, color)), NotShuttingDown) => {
self.set_unrendered_color(pipeline_id, layer_id, color);
}
@ -279,12 +287,12 @@ impl IOCompositor {
self.set_ids(frame_tree, response_chan, new_constellation_chan);
}
(Ok(GetGraphicsMetadata(chan)), false) => {
(Ok(GetGraphicsMetadata(chan)), NotShuttingDown) => {
chan.send(Some(azure_hl::current_graphics_metadata()));
}
(Ok(CreateRootCompositorLayerIfNecessary(pipeline_id, layer_id, size, color)),
false) => {
NotShuttingDown) => {
self.create_root_compositor_layer_if_necessary(pipeline_id,
layer_id,
size,
@ -295,37 +303,38 @@ impl IOCompositor {
layer_id,
rect,
scroll_behavior)),
false) => {
NotShuttingDown) => {
self.create_descendant_compositor_layer_if_necessary(pipeline_id,
layer_id,
rect,
scroll_behavior);
}
(Ok(SetLayerPageSize(pipeline_id, layer_id, new_size, epoch)), false) => {
(Ok(SetLayerPageSize(pipeline_id, layer_id, new_size, epoch)), NotShuttingDown) => {
self.set_layer_page_size(pipeline_id, layer_id, new_size, epoch);
}
(Ok(SetLayerClipRect(pipeline_id, layer_id, new_rect)), false) => {
(Ok(SetLayerClipRect(pipeline_id, layer_id, new_rect)), NotShuttingDown) => {
self.set_layer_clip_rect(pipeline_id, layer_id, new_rect);
}
(Ok(Paint(pipeline_id, layer_id, new_layer_buffer_set, epoch)), false) => {
(Ok(Paint(pipeline_id, layer_id, new_layer_buffer_set, epoch)),
NotShuttingDown) => {
self.paint(pipeline_id, layer_id, new_layer_buffer_set, epoch);
}
(Ok(ScrollFragmentPoint(pipeline_id, layer_id, point)), false) => {
(Ok(ScrollFragmentPoint(pipeline_id, layer_id, point)), NotShuttingDown) => {
self.scroll_fragment_to_point(pipeline_id, layer_id, point);
}
(Ok(LoadComplete(..)), false) => {
(Ok(LoadComplete(..)), NotShuttingDown) => {
self.load_complete = true;
}
// When we are shutting_down, we need to avoid performing operations
// such as Paint that may crash because we have begun tearing down
// the rest of our resources.
(_, true) => { }
(_, ShuttingDown) => { }
}
}
}
@ -601,7 +610,7 @@ impl IOCompositor {
debug!("shutting down the constellation for FinishedWindowEvent");
let ConstellationChan(ref chan) = self.constellation_chan;
chan.send(ExitMsg);
self.shutting_down = true;
self.shutdown_state = ShuttingDown;
}
}
@ -609,7 +618,7 @@ impl IOCompositor {
debug!("shutting down the constellation for QuitWindowEvent");
let ConstellationChan(ref chan) = self.constellation_chan;
chan.send(ExitMsg);
self.shutting_down = true;
self.shutdown_state = ShuttingDown;
}
}
}
@ -815,7 +824,7 @@ impl IOCompositor {
debug!("shutting down the constellation after generating an output file");
let ConstellationChan(ref chan) = self.constellation_chan;
chan.send(ExitMsg);
self.shutting_down = true;
self.shutdown_state = ShuttingDown;
}
self.window.present();