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Fix a compositor race condition that can result in the most recent buffer not being painted.

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This commit is contained in:
Glenn Watson 2015-05-12 10:34:05 +10:00
parent 885068207f
commit 79942f0920
4 changed files with 44 additions and 22 deletions
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36
components/compositing/compositor.rs
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@ -25,7 +25,7 @@ use layers::layers::{BufferRequest, Layer, LayerBuffer, LayerBufferSet};
use layers::rendergl::RenderContext;
use layers::rendergl;
use layers::scene::Scene;
use msg::compositor_msg::{Epoch, LayerId};
use msg::compositor_msg::{Epoch, FrameTreeId, LayerId};
use msg::compositor_msg::{ReadyState, PaintState, ScrollPolicy};
use msg::constellation_msg::AnimationState;
use msg::constellation_msg::Msg as ConstellationMsg;
@ -119,8 +119,8 @@ pub struct IOCompositor<Window: WindowMethods> {
/// many times for a single page.
got_load_complete_message: bool,
/// Whether we have received a `SetFrameTree` message.
got_set_frame_tree_message: bool,
/// The current frame tree ID (used to reject old paint buffers)
frame_tree_id: FrameTreeId,
/// The channel on which messages can be sent to the constellation.
constellation_chan: ConstellationChan,
@ -269,7 +269,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
zoom_action: false,
zoom_time: 0f64,
got_load_complete_message: false,
got_set_frame_tree_message: false,
frame_tree_id: FrameTreeId(0),
constellation_chan: constellation_chan,
time_profiler_chan: time_profiler_chan,
mem_profiler_chan: mem_profiler_chan,
@ -372,13 +372,14 @@ impl<Window: WindowMethods> IOCompositor<Window> {
self.set_layer_rect(pipeline_id, layer_id, &rect);
}
(Msg::AssignPaintedBuffers(pipeline_id, epoch, replies),
(Msg::AssignPaintedBuffers(pipeline_id, epoch, replies, frame_tree_id),
ShutdownState::NotShuttingDown) => {
for (layer_id, new_layer_buffer_set) in replies.into_iter() {
self.assign_painted_buffers(pipeline_id,
layer_id,
new_layer_buffer_set,
epoch);
epoch,
frame_tree_id);
}
self.remove_outstanding_paint_msg();
}
@ -606,7 +607,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
self.constellation_chan = new_constellation_chan;
self.send_window_size();
self.got_set_frame_tree_message = true;
self.frame_tree_id.next();
self.composite_if_necessary(CompositingReason::NewFrameTree);
}
@ -796,10 +797,18 @@ impl<Window: WindowMethods> IOCompositor<Window> {
pipeline_id: PipelineId,
layer_id: LayerId,
new_layer_buffer_set: Box<LayerBufferSet>,
epoch: Epoch) {
if let Some(layer) = self.find_layer_with_pipeline_and_layer_id(pipeline_id, layer_id) {
self.assign_painted_buffers_to_layer(layer, new_layer_buffer_set, epoch);
return
epoch: Epoch,
frame_tree_id: FrameTreeId) {
// If the frame tree id has changed since this paint request was sent,
// reject the buffers and send them back to the paint task. If this isn't handled
// correctly, the content_age in the tile grid can get out of sync when iframes are
// loaded and the frame tree changes. This can result in the compositor thinking it
// has already drawn the most recently painted buffer, and missing a frame.
if frame_tree_id == self.frame_tree_id {
if let Some(layer) = self.find_layer_with_pipeline_and_layer_id(pipeline_id, layer_id) {
self.assign_painted_buffers_to_layer(layer, new_layer_buffer_set, epoch);
return
}
}
let pipeline = self.get_pipeline(pipeline_id);
@ -1183,7 +1192,8 @@ impl<Window: WindowMethods> IOCompositor<Window> {
let mut num_paint_msgs_sent = 0;
for (pipeline_id, requests) in pipeline_requests.into_iter() {
num_paint_msgs_sent += 1;
let _ = self.get_pipeline(pipeline_id).paint_chan.send(PaintMsg::Paint(requests));
let msg = PaintMsg::Paint(requests, self.frame_tree_id);
let _ = self.get_pipeline(pipeline_id).paint_chan.send(msg);
}
self.add_outstanding_paint_msg(num_paint_msgs_sent);
@ -1207,7 +1217,7 @@ impl<Window: WindowMethods> IOCompositor<Window> {
return false;
}
if !self.got_set_frame_tree_message {
if self.frame_tree_id == FrameTreeId(0) {
return false;
}