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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_TREES_PROXY_MAIN_H_
#define CC_TREES_PROXY_MAIN_H_
#include "cc/cc_export.h"
#include "cc/input/browser_controls_state.h"
#include "cc/trees/proxy.h"
#include "cc/trees/proxy_common.h"
namespace cc {
class MutatorEvents;
class CompletionEvent;
class LayerTreeFrameSink;
class LayerTreeHost;
class LayerTreeMutator;
class PaintWorkletLayerPainter;
class ProxyImpl;
class RenderFrameMetadataObserver;
// This class aggregates all interactions that the impl side of the compositor
// needs to have with the main side.
// The class is created and lives on the main thread.
class CC_EXPORT ProxyMain : public Proxy {
public:
ProxyMain(LayerTreeHost* layer_tree_host,
TaskRunnerProvider* task_runner_provider);
ProxyMain(const ProxyMain&) = delete;
~ProxyMain() override;
ProxyMain& operator=(const ProxyMain&) = delete;
// Commits between the main and impl threads are processed through a pipeline
// with the following stages. For efficiency we can early out at any stage if
// we decide that no further processing is necessary.
enum CommitPipelineStage {
NO_PIPELINE_STAGE,
ANIMATE_PIPELINE_STAGE,
UPDATE_LAYERS_PIPELINE_STAGE,
COMMIT_PIPELINE_STAGE,
};
void DidReceiveCompositorFrameAck();
void BeginMainFrameNotExpectedSoon();
void BeginMainFrameNotExpectedUntil(base::TimeTicks time);
void DidCommitAndDrawFrame();
void SetAnimationEvents(std::unique_ptr<MutatorEvents> events);
void DidLoseLayerTreeFrameSink();
void RequestNewLayerTreeFrameSink();
void DidInitializeLayerTreeFrameSink(bool success);
void DidCompletePageScaleAnimation();
void BeginMainFrame(
std::unique_ptr<BeginMainFrameAndCommitState> begin_main_frame_state);
void DidPresentCompositorFrame(
uint32_t frame_token,
std::vector<LayerTreeHost::PresentationTimeCallback> callbacks,
const gfx::PresentationFeedback& feedback);
CommitPipelineStage max_requested_pipeline_stage() const {
return max_requested_pipeline_stage_;
}
CommitPipelineStage current_pipeline_stage() const {
return current_pipeline_stage_;
}
CommitPipelineStage final_pipeline_stage() const {
return final_pipeline_stage_;
}
private:
// Proxy implementation.
bool IsStarted() const override;
void SetLayerTreeFrameSink(
LayerTreeFrameSink* layer_tree_frame_sink) override;
void SetVisible(bool visible) override;
void SetNeedsAnimate() override;
void SetNeedsUpdateLayers() override;
void SetNeedsCommit() override;
void SetNeedsRedraw(const gfx::Rect& damage_rect) override;
void SetNextCommitWaitsForActivation() override;
bool RequestedAnimatePending() override;
void SetDeferMainFrameUpdate(bool defer_main_frame_update) override;
void StartDeferringCommits(base::TimeDelta timeout) override;
void StopDeferringCommits(PaintHoldingCommitTrigger) override;
bool CommitRequested() const override;
void Start() override;
void Stop() override;
bool SupportsImplScrolling() const override;
void SetMutator(std::unique_ptr<LayerTreeMutator> mutator) override;
void SetPaintWorkletLayerPainter(
std::unique_ptr<PaintWorkletLayerPainter> painter) override;
bool MainFrameWillHappenForTesting() override;
void ReleaseLayerTreeFrameSink() override;
void UpdateBrowserControlsState(BrowserControlsState constraints,
BrowserControlsState current,
bool animate) override;
void RequestBeginMainFrameNotExpected(bool new_state) override;
void SetSourceURL(ukm::SourceId source_id, const GURL& url) override;
void ClearHistory() override;
void SetRenderFrameObserver(
std::unique_ptr<RenderFrameMetadataObserver> observer) override;
// Returns |true| if the request was actually sent, |false| if one was
// already outstanding.
bool SendCommitRequestToImplThreadIfNeeded(
CommitPipelineStage required_stage);
bool IsMainThread() const;
bool IsImplThread() const;
base::SingleThreadTaskRunner* ImplThreadTaskRunner();
void InitializeOnImplThread(CompletionEvent* completion_event);
void DestroyProxyImplOnImplThread(CompletionEvent* completion_event);
LayerTreeHost* layer_tree_host_;
TaskRunnerProvider* task_runner_provider_;
const int layer_tree_host_id_;
// The furthest pipeline stage which has been requested for the next
// commit.
CommitPipelineStage max_requested_pipeline_stage_;
// The commit pipeline stage that is currently being processed.
CommitPipelineStage current_pipeline_stage_;
// The commit pipeline stage at which processing for the current commit
// will stop. Only valid while we are executing the pipeline (i.e.,
// |current_pipeline_stage| is set to a pipeline stage).
CommitPipelineStage final_pipeline_stage_;
// The final_pipeline_stage_ that was requested before the last commit was
// deferred.
CommitPipelineStage deferred_final_pipeline_stage_;
bool commit_waits_for_activation_;
// Set when the Proxy is started using Proxy::Start() and reset when it is
// stopped using Proxy::Stop().
bool started_;
// defer_main_frame_update_ will also cause commits to be deferred, regardless
// of the setting for defer_commits_.
bool defer_main_frame_update_;
bool defer_commits_;
// Only used when defer_commits_ is active and must be set in such cases.
base::TimeTicks commits_restart_time_;
// ProxyImpl is created and destroyed on the impl thread, and should only be
// accessed on the impl thread.
// It is safe to use base::Unretained to post tasks to ProxyImpl on the impl
// thread, since we control its lifetime. Any tasks posted to it are bound to
// run before we destroy it on the impl thread.
std::unique_ptr<ProxyImpl> proxy_impl_;
// WeakPtrs generated by this factory will be invalidated when
// LayerTreeFrameSink is released.
base::WeakPtrFactory<ProxyMain> frame_sink_bound_weak_factory_{this};
base::WeakPtrFactory<ProxyMain> weak_factory_{this};
};
} // namespace cc
#endif // CC_TREES_PROXY_MAIN_H_