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Unified Diff: cc/scheduler/scheduler_state_machine.cc

Issue 723713003: cc: Add SetChildrenNeedBeginFrames() & SendBeginFramesToChildren() (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: rebase on master Created 6 years, 1 month ago
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Index: cc/scheduler/scheduler_state_machine.cc
diff --git a/cc/scheduler/scheduler_state_machine.cc b/cc/scheduler/scheduler_state_machine.cc
index 82b13d779b6980ea6a6513d71676a5999ad431b3..5f56255926f47b667cf9f39aa28e85e3ab3dff05 100644
--- a/cc/scheduler/scheduler_state_machine.cc
+++ b/cc/scheduler/scheduler_state_machine.cc
@@ -47,7 +47,8 @@ SchedulerStateMachine::SchedulerStateMachine(const SchedulerSettings& settings)
skip_next_begin_main_frame_to_reduce_latency_(false),
skip_begin_main_frame_to_reduce_latency_(false),
continuous_painting_(false),
- impl_latency_takes_priority_on_battery_(false) {
+ impl_latency_takes_priority_on_battery_(false),
+ children_need_begin_frames_(false) {
}
const char* SchedulerStateMachine::OutputSurfaceStateToString(
@@ -234,6 +235,7 @@ void SchedulerStateMachine::AsValueInto(base::debug::TracedValue* state,
state->SetBoolean("continuous_painting", continuous_painting_);
state->SetBoolean("impl_latency_takes_priority_on_battery",
impl_latency_takes_priority_on_battery_);
+ state->SetBoolean("children_need_begin_frames", children_need_begin_frames_);
state->EndDictionary();
}
@@ -672,16 +674,28 @@ void SchedulerStateMachine::SetSkipNextBeginMainFrameToReduceLatency() {
skip_next_begin_main_frame_to_reduce_latency_ = true;
}
+bool SchedulerStateMachine::BeginFrameNeededForChildren() const {
+ if (HasInitializedOutputSurface())
+ return children_need_begin_frames_;
+
+ return false;
+}
+
bool SchedulerStateMachine::BeginFrameNeeded() const {
+ if (SupportsProactiveBeginFrame()) {
+ return (BeginFrameNeededToAnimateOrDraw() ||
+ BeginFrameNeededForChildren() ||
+ ProactiveBeginFrameWanted());
+ }
+
// Proactive BeginFrames are bad for the synchronous compositor because we
// have to draw when we get the BeginFrame and could end up drawing many
// duplicate frames if our new frame isn't ready in time.
// To poll for state with the synchronous compositor without having to draw,
// we rely on ShouldPollForAnticipatedDrawTriggers instead.
- if (!SupportsProactiveBeginFrame())
- return BeginFrameNeededToAnimateOrDraw();
-
- return BeginFrameNeededToAnimateOrDraw() || ProactiveBeginFrameWanted();
+ // Synchronous compositor doesn't have a browser.
+ DCHECK(!children_need_begin_frames_);
+ return BeginFrameNeededToAnimateOrDraw();
}
bool SchedulerStateMachine::ShouldPollForAnticipatedDrawTriggers() const {
@@ -707,6 +721,12 @@ bool SchedulerStateMachine::SupportsProactiveBeginFrame() const {
return !settings_.using_synchronous_renderer_compositor;
}
+void SchedulerStateMachine::SetChildrenNeedBeginFrames(
+ bool children_need_begin_frames) {
+ DCHECK(settings_.forward_begin_frames_to_children);
+ children_need_begin_frames_ = children_need_begin_frames;
+}
+
// These are the cases where we definitely (or almost definitely) have a
// new frame to animate and/or draw and can draw.
bool SchedulerStateMachine::BeginFrameNeededToAnimateOrDraw() const {
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