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Fixes a number of race conditions and reliability issues with reftests and compositor.

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The basic idea is it's safe to output an image for reftest by testing:
 - That the compositor doesn't have any animations active.
 - That the compositor is not waiting on any outstanding paint messages to arrive.
 - That the script tasks are "idle" and therefore won't cause reflow.
    - This currently means page loaded, onload fired, reftest-wait not active, first reflow triggered.
    - It could easily be expanded to handle pending timers etc.
 - That the "epoch" that the layout tasks have last laid out after script went idle, is reflected by the compositor in all visible layers for that pipeline.
This commit is contained in:
Glenn Watson 2015-05-13 09:58:01 +10:00
parent b3b9deafa7
commit eec3fad93d
17 changed files with 363 additions and 390 deletions
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49
components/gfx/paint_task.rs
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@ -20,8 +20,8 @@ use layers::platform::surface::{NativeGraphicsMetadata, NativePaintingGraphicsCo
use layers::platform::surface::NativeSurface;
use layers::layers::{BufferRequest, LayerBuffer, LayerBufferSet};
use layers;
use msg::compositor_msg::{Epoch, FrameTreeId, PaintState, LayerId};
use msg::compositor_msg::{LayerMetadata, PaintListener, ScrollPolicy};
use msg::compositor_msg::{Epoch, FrameTreeId, LayerId};
use msg::compositor_msg::{LayerProperties, PaintListener, ScrollPolicy};
use msg::constellation_msg::Msg as ConstellationMsg;
use msg::constellation_msg::{ConstellationChan, Failure, PipelineId};
use msg::constellation_msg::PipelineExitType;
@ -67,7 +67,7 @@ pub struct PaintRequest {
}
pub enum Msg {
PaintInit(Arc<StackingContext>),
PaintInit(Epoch, Arc<StackingContext>),
Paint(Vec<PaintRequest>, FrameTreeId),
UnusedBuffer(Vec<Box<LayerBuffer>>),
PaintPermissionGranted,
@ -112,8 +112,8 @@ pub struct PaintTask<C> {
/// Permission to send paint messages to the compositor
paint_permission: bool,
/// A counter for epoch messages
epoch: Epoch,
/// The current epoch counter is passed by the layout task
current_epoch: Option<Epoch>,
/// A data structure to store unused LayerBuffers
buffer_map: BufferMap,
@ -165,7 +165,7 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
native_graphics_context: native_graphics_context,
root_stacking_context: None,
paint_permission: false,
epoch: Epoch(0),
current_epoch: None,
buffer_map: BufferMap::new(10000000),
worker_threads: worker_threads,
used_buffer_count: 0,
@ -197,7 +197,8 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
let mut waiting_for_compositor_buffers_to_exit = false;
loop {
match self.port.recv().unwrap() {
Msg::PaintInit(stacking_context) => {
Msg::PaintInit(epoch, stacking_context) => {
self.current_epoch = Some(epoch);
self.root_stacking_context = Some(stacking_context.clone());
if !self.paint_permission {
@ -207,7 +208,6 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
continue;
}
self.epoch.next();
self.initialize_layers();
}
Msg::Paint(requests, frame_tree_id) => {
@ -215,30 +215,26 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
debug!("PaintTask: paint ready msg");
let ConstellationChan(ref mut c) = self.constellation_chan;
c.send(ConstellationMsg::PainterReady(self.id)).unwrap();
self.compositor.paint_msg_discarded();
continue;
}
let mut replies = Vec::new();
self.compositor.set_paint_state(self.id, PaintState::Painting);
for PaintRequest { buffer_requests, scale, layer_id, epoch }
in requests.into_iter() {
if self.epoch == epoch {
if self.current_epoch == Some(epoch) {
self.paint(&mut replies, buffer_requests, scale, layer_id);
} else {
debug!("painter epoch mismatch: {:?} != {:?}", self.epoch, epoch);
debug!("painter epoch mismatch: {:?} != {:?}", self.current_epoch, epoch);
}
}
self.compositor.set_paint_state(self.id, PaintState::Idle);
for reply in replies.iter() {
let &(_, ref buffer_set) = reply;
self.used_buffer_count += (*buffer_set).buffers.len();
}
debug!("PaintTask: returning surfaces");
self.compositor.assign_painted_buffers(self.id, self.epoch, replies, frame_tree_id);
self.compositor.assign_painted_buffers(self.id, self.current_epoch.unwrap(), replies, frame_tree_id);
}
Msg::UnusedBuffer(unused_buffers) => {
debug!("PaintTask: Received {} unused buffers", unused_buffers.len());
@ -258,7 +254,6 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
self.paint_permission = true;
if self.root_stacking_context.is_some() {
self.epoch.next();
self.initialize_layers();
}
}
@ -379,11 +374,11 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
Some(ref root_stacking_context) => root_stacking_context,
};
let mut metadata = Vec::new();
build(&mut metadata, &**root_stacking_context, &ZERO_POINT);
self.compositor.initialize_layers_for_pipeline(self.id, metadata, self.epoch);
let mut properties = Vec::new();
build(&mut properties, &**root_stacking_context, &ZERO_POINT);
self.compositor.initialize_layers_for_pipeline(self.id, properties, self.current_epoch.unwrap());
fn build(metadata: &mut Vec<LayerMetadata>,
fn build(properties: &mut Vec<LayerProperties>,
stacking_context: &StackingContext,
page_position: &Point2D<Au>) {
let page_position = stacking_context.bounds.origin + *page_position;
@ -392,20 +387,20 @@ impl<C> PaintTask<C> where C: PaintListener + Send + 'static {
// the compositor is concerned.
let overflow_relative_page_position = page_position + stacking_context.overflow.origin;
let layer_position =
Rect(Point2D(overflow_relative_page_position.x.to_nearest_px() as i32,
overflow_relative_page_position.y.to_nearest_px() as i32),
Size2D(stacking_context.overflow.size.width.to_nearest_px() as i32,
stacking_context.overflow.size.height.to_nearest_px() as i32));
metadata.push(LayerMetadata {
Rect(Point2D(overflow_relative_page_position.x.to_nearest_px() as f32,
overflow_relative_page_position.y.to_nearest_px() as f32),
Size2D(stacking_context.overflow.size.width.to_nearest_px() as f32,
stacking_context.overflow.size.height.to_nearest_px() as f32));
properties.push(LayerProperties {
id: paint_layer.id,
position: layer_position,
rect: layer_position,
background_color: paint_layer.background_color,
scroll_policy: paint_layer.scroll_policy,
})
}
for kid in stacking_context.display_list.children.iter() {
build(metadata, &**kid, &page_position)
build(properties, &**kid, &page_position)
}
}
}