blob: 96907643fdcccd19aa72823284f8ac6257ccdd06 [file] [log] [blame]
// Copyright 2011 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.
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include <memory>
#include <set>
#include <string>
#include <unordered_map>
#include <vector>
#include "base/callback_forward.h"
#include "base/cancelable_callback.h"
#include "base/containers/flat_map.h"
#include "base/containers/flat_set.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "cc/benchmarks/micro_benchmark.h"
#include "cc/benchmarks/micro_benchmark_controller.h"
#include "cc/cc_export.h"
#include "cc/input/browser_controls_state.h"
#include "cc/input/event_listener_properties.h"
#include "cc/input/input_handler.h"
#include "cc/input/layer_selection_bound.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/layer_collections.h"
#include "cc/layers/layer_list_iterator.h"
#include "cc/trees/compositor_mode.h"
#include "cc/trees/layer_tree_frame_sink.h"
#include "cc/trees/layer_tree_host_client.h"
#include "cc/trees/layer_tree_settings.h"
#include "cc/trees/mutator_host.h"
#include "cc/trees/proxy.h"
#include "cc/trees/swap_promise.h"
#include "cc/trees/swap_promise_manager.h"
#include "cc/trees/target_property.h"
#include "components/viz/common/resources/resource_format.h"
#include "components/viz/common/surfaces/local_surface_id_allocation.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "third_party/skia/include/core/SkColor.h"
#include "ui/gfx/geometry/rect.h"
namespace gfx {
struct PresentationFeedback;
namespace cc {
class HeadsUpDisplayLayer;
class Layer;
class LayerTreeHostClient;
class LayerTreeHostImpl;
class LayerTreeHostImplClient;
class LayerTreeHostSingleThreadClient;
class LayerTreeMutator;
class PaintWorkletLayerPainter;
class MutatorEvents;
class MutatorHost;
struct PendingPageScaleAnimation;
class RenderFrameMetadataObserver;
class RenderingStatsInstrumentation;
struct OverscrollBehavior;
class TaskGraphRunner;
class UIResourceManager;
class UkmRecorderFactory;
struct RenderingStats;
struct ScrollAndScaleSet;
// Returned from LayerTreeHost::DeferMainFrameUpdate. Automatically un-defers on
// destruction.
class CC_EXPORT ScopedDeferMainFrameUpdate {
explicit ScopedDeferMainFrameUpdate(LayerTreeHost* host);
base::WeakPtr<LayerTreeHost> host_;
class CC_EXPORT LayerTreeHost : public MutatorHostClient {
struct CC_EXPORT InitParams {
LayerTreeHostClient* client = nullptr;
TaskGraphRunner* task_graph_runner = nullptr;
LayerTreeSettings const* settings = nullptr;
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner;
MutatorHost* mutator_host = nullptr;
// The image worker task runner is used to schedule image decodes. The
// compositor thread may make sync calls to this thread, analogous to the
// raster worker threads.
scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner;
std::unique_ptr<UkmRecorderFactory> ukm_recorder_factory;
InitParams& operator=(InitParams&&);
// Constructs a LayerTreeHost with a compositor thread where scrolling and
// animation take place. This is used for the web compositor in the renderer
// process to move work off the main thread which javascript can dominate.
static std::unique_ptr<LayerTreeHost> CreateThreaded(
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner,
InitParams params);
// Constructs a LayerTreeHost without a separate compositor thread, but which
// behaves and looks the same as a threaded compositor externally, with the
// exception of the additional client interface. This is used in other cases
// where the main thread creating this instance can be expected to not become
// blocked, so moving work to another thread and the overhead it adds are not
// required.
static std::unique_ptr<LayerTreeHost> CreateSingleThreaded(
LayerTreeHostSingleThreadClient* single_thread_client,
InitParams params);
virtual ~LayerTreeHost();
// Returns the process global unique identifier for this LayerTreeHost.
int GetId() const;
// The current source frame number. This is incremented for each main frame
// update(commit) pushed to the compositor thread. The initial frame number
// is 0, and it is incremented once commit is completed (which is before the
// compositor-thread-side submits its frame for the commit).
int SourceFrameNumber() const;
// Returns the UIResourceManager used to create UIResources for
// UIResourceLayers pushed to the LayerTree.
UIResourceManager* GetUIResourceManager() const;
// Returns the TaskRunnerProvider used to access the main and compositor
// thread task runners.
TaskRunnerProvider* GetTaskRunnerProvider() const;
// Returns the settings used by this host. These settings are constants given
// at startup.
const LayerTreeSettings& GetSettings() const;
// Sets the LayerTreeMutator interface used to directly mutate the compositor
// state on the compositor thread. (Compositor-Worker)
void SetLayerTreeMutator(std::unique_ptr<LayerTreeMutator> mutator);
// Sets the LayerTreePainter interface used to dispatch the JS paint callback
// to a worklet thread.
void SetPaintWorkletLayerPainter(
std::unique_ptr<PaintWorkletLayerPainter> painter);
// Attachs a SwapPromise to the Layer tree, that passes through the
// LayerTreeHost and LayerTreeHostImpl with the next commit and frame
// submission, which can be used to observe that progress. This also
// causes a main frame to be requested.
// See swap_promise.h for how to use SwapPromise.
void QueueSwapPromise(std::unique_ptr<SwapPromise> swap_promise);
// Returns the SwapPromiseManager, used to insert SwapPromises dynamically
// when a main frame is requested.
SwapPromiseManager* GetSwapPromiseManager();
// Sets whether the content is suitable to use Gpu Rasterization. This flag is
// used to enable gpu rasterization, and can be modified at any time to change
// the setting based on content.
void SetHasGpuRasterizationTrigger(bool has_trigger);
// Visibility and LayerTreeFrameSink -------------------------------
// Sets or gets if the LayerTreeHost is visible. When not visible it will:
// - Not request a new LayerTreeFrameSink from the client.
// - Stop submitting frames to the display compositor.
// - Stop producing main frames and committing them.
// The LayerTreeHost is not visible when first created, so this must be called
// to make it visible before it will attempt to start producing output.
void SetVisible(bool visible);
bool IsVisible() const;
// Called in response to a LayerTreeFrameSink request made to the client
// using LayerTreeHostClient::RequestNewLayerTreeFrameSink. The client will
// be informed of the LayerTreeFrameSink initialization status using
// DidInitializaLayerTreeFrameSink or DidFailToInitializeLayerTreeFrameSink.
// The request is completed when the host successfully initializes an
// LayerTreeFrameSink.
void SetLayerTreeFrameSink(
std::unique_ptr<LayerTreeFrameSink> layer_tree_frame_sink);
// Forces the host to immediately release all references to the
// LayerTreeFrameSink, if any. Can be safely called any time, but the
// compositor should not be visible.
std::unique_ptr<LayerTreeFrameSink> ReleaseLayerTreeFrameSink();
// Frame Scheduling (main and compositor frames) requests -------
// Requests a main frame update even if no content has changed. This is used,
// for instance in the case of RequestAnimationFrame from blink to ensure the
// main frame update is run on the next tick without pre-emptively forcing a
// full commit synchronization or layer updates.
void SetNeedsAnimate();
// Requests a main frame update and also ensure that the host pulls layer
// updates from the client, even if no content might have changed, without
// forcing a full commit synchronization.
virtual void SetNeedsUpdateLayers();
// Requests that the next main frame update performs a full commit
// synchronization.
virtual void SetNeedsCommit();
// Returns true after SetNeedsAnimate(), SetNeedsUpdateLayers() or
// SetNeedsCommit(), until it is satisfied.
bool RequestedMainFramePendingForTesting();
// Requests that the next frame re-chooses crisp raster scales for all layers.
void SetNeedsRecalculateRasterScales();
// Returns true if a main frame with commit synchronization has been
// requested.
bool CommitRequested() const;
// Prevents the compositor from requesting main frame updates from the client
// until the ScopedDeferMainFrameUpdate object is destroyed, or
// StopDeferringCommits is called.
std::unique_ptr<ScopedDeferMainFrameUpdate> DeferMainFrameUpdate();
// Returns whether there are any outstanding ScopedDeferMainFrameUpdate,
// though commits may be deferred also when the local_surface_id_from_parent()
// is not valid.
bool defer_main_frame_update() const {
return defer_main_frame_update_count_;
// Synchronously performs a main frame update and layer updates. Used only in
// single threaded mode when the compositor's internal scheduling is disabled.
void LayoutAndUpdateLayers();
// Synchronously performs a complete main frame update, commit and compositor
// frame. Used only in single threaded mode when the compositor's internal
// scheduling is disabled.
void Composite(base::TimeTicks frame_begin_time, bool raster);
// Requests a redraw (compositor frame) for the given rect.
void SetNeedsRedrawRect(const gfx::Rect& damage_rect);
// Requests a main frame (including layer updates) and ensures that this main
// frame results in a redraw for the complete viewport when producing the
// CompositorFrame.
void SetNeedsCommitWithForcedRedraw();
// Input Handling ---------------------------------------------
// Notifies the compositor that input from the browser is being throttled till
// the next commit. The compositor will prioritize activation of the pending
// tree so a commit can be performed.
void NotifyInputThrottledUntilCommit();
// Sets the state of the browser controls. (Used for URL bar animations on
// android).
void UpdateBrowserControlsState(BrowserControlsState constraints,
BrowserControlsState current,
bool animate);
// Returns a reference to the InputHandler used to respond to input events on
// the compositor thread.
const base::WeakPtr<InputHandler>& GetInputHandler() const;
// Debugging and benchmarks ---------------------------------
void SetDebugState(const LayerTreeDebugState& debug_state);
const LayerTreeDebugState& GetDebugState() const;
// Returns the id of the benchmark on success, 0 otherwise.
int ScheduleMicroBenchmark(const std::string& benchmark_name,
std::unique_ptr<base::Value> value,
MicroBenchmark::DoneCallback callback);
// Returns true if the message was successfully delivered and handled.
bool SendMessageToMicroBenchmark(int id, std::unique_ptr<base::Value> value);
// When the main thread informs the compositor thread that it is ready to
// commit, generally it would remain blocked until the main thread state is
// copied to the pending tree. Calling this would ensure that the main thread
// remains blocked until the pending tree is activated.
void SetNextCommitWaitsForActivation();
// Registers a callback that is run when the next frame successfully makes it
// to the screen (it's entirely possible some frames may be dropped between
// the time this is called and the callback is run).
using PresentationTimeCallback =
base::OnceCallback<void(const gfx::PresentationFeedback&)>;
void RequestPresentationTimeForNextFrame(PresentationTimeCallback callback);
// Layer tree accessors and modifiers ------------------------
// Sets or gets the root of the Layer tree. Children of the root Layer are
// attached to it and will be added/removed along with the root Layer. The
// LayerTreeHost retains ownership of a reference to the root Layer.
void SetRootLayer(scoped_refptr<Layer> root_layer);
Layer* root_layer() { return root_layer_.get(); }
const Layer* root_layer() const { return root_layer_.get(); }
// Viewport Layers are used to identify key layers to the compositor thread,
// so that it can perform viewport-based scrolling independently, such as
// for pinch-zoom or overscroll elasticity.
struct CC_EXPORT ViewportLayers {
ElementId overscroll_elasticity_element_id;
scoped_refptr<Layer> page_scale;
scoped_refptr<Layer> inner_viewport_container;
scoped_refptr<Layer> outer_viewport_container;
scoped_refptr<Layer> inner_viewport_scroll;
scoped_refptr<Layer> outer_viewport_scroll;
// Sets or gets the collection of viewport Layers, defined to allow pinch-zoom
// transformations on the compositor thread.
void RegisterViewportLayers(const ViewportLayers& viewport_layers);
ElementId overscroll_elasticity_element_id() const {
return viewport_layers_.overscroll_elasticity_element_id;
Layer* page_scale_layer() const { return viewport_layers_.page_scale.get(); }
Layer* inner_viewport_container_layer() const {
return viewport_layers_.inner_viewport_container.get();
Layer* outer_viewport_container_layer() const {
return viewport_layers_.outer_viewport_container.get();
Layer* inner_viewport_scroll_layer() const {
return viewport_layers_.inner_viewport_scroll.get();
Layer* outer_viewport_scroll_layer() const {
return viewport_layers_.outer_viewport_scroll.get();
// Counterpart of ViewportLayers for CompositeAfterPaint which doesn't create
// viewport layers.
struct ViewportPropertyIds {
int page_scale_transform = TransformTree::kInvalidNodeId;
int inner_scroll = ScrollTree::kInvalidNodeId;
// TODO( Switch other usages of viewport layers to
// property ids for CompositeAfterPaint.
void RegisterViewportPropertyIds(const ViewportPropertyIds&);
// Sets or gets the position of touch handles for a text selection. These are
// submitted to the display compositor along with the Layer tree's contents
// allowing it to present the selection handles. This is done because the
// handles are a UI widget above, and not clipped to, the viewport of this
// LayerTreeHost.
void RegisterSelection(const LayerSelection& selection);
const LayerSelection& selection() const { return selection_; }
// Sets or gets if the client has any scroll event handlers registered. This
// allows the threaded compositor to prioritize main frames even when
// servicing a touch scroll on the compositor thread, in order to give the
// event handler a chance to be part of each frame.
void SetHaveScrollEventHandlers(bool have_event_handlers);
bool have_scroll_event_handlers() const {
return have_scroll_event_handlers_;
// Set or get what event handlers exist on the layer tree in order to inform
// the compositor thread if it is able to handle an input event, or it needs
// to pass it to the main thread to be handled. The class is the type of input
// event, and for each class there is a properties defining if the compositor
// thread can handle the event.
void SetEventListenerProperties(EventListenerClass event_class,
EventListenerProperties event_properties);
EventListenerProperties event_listener_properties(
EventListenerClass event_class) const {
return event_listener_properties_[static_cast<size_t>(event_class)];
void SetViewportSizeAndScale(const gfx::Size& device_viewport_size,
float device_scale_factor,
const viz::LocalSurfaceIdAllocation&
void SetViewportVisibleRect(const gfx::Rect& visible_rect);
gfx::Rect viewport_visible_rect() const { return viewport_visible_rect_; }
gfx::Size device_viewport_size() const { return device_viewport_size_; }
void SetBrowserControlsHeight(float top_height,
float bottom_height,
bool shrink);
void SetBrowserControlsShownRatio(float ratio);
void SetOverscrollBehavior(const OverscrollBehavior& overscroll_behavior);
void SetPageScaleFactorAndLimits(float page_scale_factor,
float min_page_scale_factor,
float max_page_scale_factor);
float page_scale_factor() const { return page_scale_factor_; }
float min_page_scale_factor() const { return min_page_scale_factor_; }
float max_page_scale_factor() const { return max_page_scale_factor_; }
void set_background_color(SkColor color) { background_color_ = color; }
SkColor background_color() const { return background_color_; }
void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
bool use_anchor,
float scale,
base::TimeDelta duration);
bool HasPendingPageScaleAnimation() const;
float device_scale_factor() const { return device_scale_factor_; }
void SetRecordingScaleFactor(float recording_scale_factor);
float painted_device_scale_factor() const {
return painted_device_scale_factor_;
void SetContentSourceId(uint32_t);
uint32_t content_source_id() const { return content_source_id_; }
// Clears image caches and resets the scheduling history for the content
// produced by this host so far.
void ClearCachesOnNextCommit();
// If this LayerTreeHost needs a valid viz::LocalSurfaceId then commits will
// be deferred until a valid viz::LocalSurfaceId is provided.
void SetLocalSurfaceIdAllocationFromParent(
const viz::LocalSurfaceIdAllocation&
const viz::LocalSurfaceIdAllocation& local_surface_id_allocation_from_parent()
const {
return local_surface_id_allocation_from_parent_;
// Requests the allocation of a new LocalSurfaceId on the compositor thread.
void RequestNewLocalSurfaceId();
// Returns the current state of the new LocalSurfaceId request and resets
// the state.
bool TakeNewLocalSurfaceIdRequest();
bool new_local_surface_id_request_for_testing() const {
return new_local_surface_id_request_;
void SetRasterColorSpace(const gfx::ColorSpace& raster_color_space);
const gfx::ColorSpace& raster_color_space() const {
return raster_color_space_;
// This layer tree may be embedded in a hierarchy that has page scale
// factor controlled at the top level. We represent that scale here as
// 'external_page_scale_factor', a value that affects raster scale in the
// same way that page_scale_factor does, but doesn't affect any geometry
// calculations.
void SetExternalPageScaleFactor(float page_scale_factor);
// Requests that we force send RenderFrameMetadata with the next frame.
void RequestForceSendMetadata() { force_send_metadata_request_ = true; }
// Returns the state of |force_send_metadata_request_| and resets the
// variable to false.
bool TakeForceSendMetadataRequest();
// Used externally by blink for setting the PropertyTrees when
// UseLayerLists() is true, which also implies that Slimming Paint
// v2 is enabled.
PropertyTrees* property_trees() { return &property_trees_; }
const PropertyTrees* property_trees() const { return &property_trees_; }
void SetNeedsDisplayOnAllLayers();
void RegisterLayer(Layer* layer);
void UnregisterLayer(Layer* layer);
Layer* LayerById(int id) const;
bool PaintContent(const LayerList& update_layer_list,
bool* content_has_slow_paths,
bool* content_has_non_aa_paint);
bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
void SetHasCopyRequest(bool has_copy_request);
bool has_copy_request() const { return has_copy_request_; }
void AddSurfaceRange(const viz::SurfaceRange& surface_range);
void RemoveSurfaceRange(const viz::SurfaceRange& surface_range);
base::flat_set<viz::SurfaceRange> SurfaceRanges() const;
// Marks or unmarks a layer are needing PushPropertiesTo in the next commit.
// These are internal methods, called from the Layer itself when changing a
// property or completing a PushPropertiesTo.
void AddLayerShouldPushProperties(Layer* layer);
void RemoveLayerShouldPushProperties(Layer* layer);
void ClearLayersThatShouldPushProperties();
// The current set of all Layers attached to the LayerTreeHost's tree that
// have been marked as needing PushPropertiesTo in the next commit.
const base::flat_set<Layer*>& LayersThatShouldPushProperties() {
return layers_that_should_push_properties_;
void SetPageScaleFromImplSide(float page_scale);
void SetElasticOverscrollFromImplSide(gfx::Vector2dF elastic_overscroll);
gfx::Vector2dF elastic_overscroll() const { return elastic_overscroll_; }
// Ensures a HUD layer exists if it is needed, and updates the HUD bounds and
// position. If a HUD layer exists but is no longer needed, it is destroyed.
void UpdateHudLayer(bool show_hud_info);
HeadsUpDisplayLayer* hud_layer() const { return hud_layer_.get(); }
virtual void SetNeedsFullTreeSync();
bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
bool needs_surface_ranges_sync() const { return needs_surface_ranges_sync_; }
void set_needs_surface_ranges_sync(bool needs_surface_ranges_sync) {
needs_surface_ranges_sync_ = needs_surface_ranges_sync;
void SetPropertyTreesNeedRebuild();
void PushPropertyTreesTo(LayerTreeImpl* tree_impl);
void PushLayerTreePropertiesTo(LayerTreeImpl* tree_impl);
// TODO(flackr): This list should be on the property trees and pushed
// as part of PushPropertyTreesTo.
void PushRegisteredElementIdsTo(LayerTreeImpl* tree_impl);
void PushSurfaceRangesTo(LayerTreeImpl* tree_impl);
void PushLayerTreeHostPropertiesTo(LayerTreeHostImpl* host_impl);
MutatorHost* mutator_host() const { return mutator_host_; }
// Returns the layer with the given |element_id|. In layer-list mode, only
// scrollable layers are registered in this map.
Layer* LayerByElementId(ElementId element_id) const;
void RegisterElement(ElementId element_id,
ElementListType list_type,
Layer* layer);
void UnregisterElement(ElementId element_id, ElementListType list_type);
// Registers the new active element ids, updating |registered_element_ids_|,
// and unregisters any element ids that were previously registered. This is
// similar to |RegisterElement| and |UnregisterElement| but for layer lists
// where we do not have a unique element id to layer mapping.
using ElementIdSet = std::unordered_set<ElementId, ElementIdHash>;
void SetActiveRegisteredElementIds(const ElementIdSet&);
const ElementIdSet& elements_in_property_trees() {
return elements_in_property_trees_;
void SetElementIdsForTesting();
void BuildPropertyTreesForTesting();
// Layer iterators.
LayerListIterator<Layer> begin() const;
LayerListIterator<Layer> end() const;
LayerListReverseIterator<Layer> rbegin();
LayerListReverseIterator<Layer> rend();
// LayerTreeHost interface to Proxy.
void WillBeginMainFrame();
void DidBeginMainFrame();
void BeginMainFrame(const viz::BeginFrameArgs& args);
void BeginMainFrameNotExpectedSoon();
void BeginMainFrameNotExpectedUntil(base::TimeTicks time);
void AnimateLayers(base::TimeTicks monotonic_frame_begin_time);
void RequestMainFrameUpdate(bool record_main_frame_metrics);
void FinishCommitOnImplThread(LayerTreeHostImpl* host_impl);
void WillCommit();
void CommitComplete();
void RequestNewLayerTreeFrameSink();
void DidInitializeLayerTreeFrameSink();
void DidFailToInitializeLayerTreeFrameSink();
virtual std::unique_ptr<LayerTreeHostImpl> CreateLayerTreeHostImpl(
LayerTreeHostImplClient* client);
void DidLoseLayerTreeFrameSink();
void DidCommitAndDrawFrame() { client_->DidCommitAndDrawFrame(); }
void DidReceiveCompositorFrameAck() {
bool UpdateLayers();
void DidPresentCompositorFrame(
uint32_t frame_token,
std::vector<LayerTreeHost::PresentationTimeCallback> callbacks,
const gfx::PresentationFeedback& feedback);
// Called when the compositor completed page scale animation.
void DidCompletePageScaleAnimation();
void ApplyScrollAndScale(ScrollAndScaleSet* info);
void RecordEndOfFrameMetrics(base::TimeTicks frame_begin_time);
LayerTreeHostClient* client() { return client_; }
bool gpu_rasterization_histogram_recorded() const {
return gpu_rasterization_histogram_recorded_;
void CollectRenderingStats(RenderingStats* stats) const;
RenderingStatsInstrumentation* rendering_stats_instrumentation() const {
return rendering_stats_instrumentation_.get();
void SetAnimationEvents(std::unique_ptr<MutatorEvents> events);
bool has_gpu_rasterization_trigger() const {
return has_gpu_rasterization_trigger_;
Proxy* proxy() const { return proxy_.get(); }
bool IsSingleThreaded() const;
bool IsThreaded() const;
// Indicates whether this host is configured to use layer lists
// rather than layer trees. This also implies that property trees
// are always already built and so cc doesn't have to build them.
bool IsUsingLayerLists() const;
// MutatorHostClient implementation.
bool IsElementInList(ElementId element_id,
ElementListType list_type) const override;
void SetMutatorsNeedCommit() override;
void SetMutatorsNeedRebuildPropertyTrees() override;
void SetElementFilterMutated(ElementId element_id,
ElementListType list_type,
const FilterOperations& filters) override;
void SetElementOpacityMutated(ElementId element_id,
ElementListType list_type,
float opacity) override;
void SetElementTransformMutated(ElementId element_id,
ElementListType list_type,
const gfx::Transform& transform) override;
void SetElementScrollOffsetMutated(
ElementId element_id,
ElementListType list_type,
const gfx::ScrollOffset& scroll_offset) override;
void ElementIsAnimatingChanged(const PropertyToElementIdMap& element_id_map,
ElementListType list_type,
const PropertyAnimationState& mask,
const PropertyAnimationState& state) override;
void ScrollOffsetAnimationFinished() override {}
gfx::ScrollOffset GetScrollOffsetForAnimation(
ElementId element_id) const override;
void QueueImageDecode(const PaintImage& image,
base::OnceCallback<void(bool)> callback);
void ImageDecodesFinished(const std::vector<std::pair<int, bool>>& results);
void RequestBeginMainFrameNotExpected(bool new_state);
float recording_scale_factor() const { return recording_scale_factor_; }
void SetURLForUkm(const GURL& url);
void SetRenderFrameObserver(
std::unique_ptr<RenderFrameMetadataObserver> observer);
LayerTreeHost(InitParams params, CompositorMode mode);
void InitializeThreaded(
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> impl_task_runner);
void InitializeSingleThreaded(
LayerTreeHostSingleThreadClient* single_thread_client,
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner);
void InitializeForTesting(
std::unique_ptr<TaskRunnerProvider> task_runner_provider,
std::unique_ptr<Proxy> proxy_for_testing);
void SetTaskRunnerProviderForTesting(
std::unique_ptr<TaskRunnerProvider> task_runner_provider);
void SetUIResourceManagerForTesting(
std::unique_ptr<UIResourceManager> ui_resource_manager);
// task_graph_runner() returns a valid value only until the LayerTreeHostImpl
// is created in CreateLayerTreeHostImpl().
TaskGraphRunner* task_graph_runner() const { return task_graph_runner_; }
void OnCommitForSwapPromises();
void RecordGpuRasterizationHistogram(const LayerTreeHostImpl* host_impl);
MicroBenchmarkController micro_benchmark_controller_;
base::WeakPtr<InputHandler> input_handler_weak_ptr_;
scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner_;
std::unique_ptr<UkmRecorderFactory> ukm_recorder_factory_;
friend class LayerTreeHostSerializationTest;
friend class ScopedDeferMainFrameUpdate;
// This is the number of consecutive frames in which we want the content to be
// free of slow-paths before toggling the flag.
enum { kNumFramesToConsiderBeforeRemovingSlowPathFlag = 60 };
void ApplyViewportChanges(const ScrollAndScaleSet& info);
void RecordWheelAndTouchScrollingCount(const ScrollAndScaleSet& info);
void SendOverscrollAndScrollEndEventsFromImplSide(
const ScrollAndScaleSet& info);
void ApplyPageScaleDeltaFromImplSide(float page_scale_delta);
void InitializeProxy(std::unique_ptr<Proxy> proxy);
bool DoUpdateLayers(Layer* root_layer);
void UpdateDeferMainFrameUpdateInternal();
const CompositorMode compositor_mode_;
std::unique_ptr<UIResourceManager> ui_resource_manager_;
LayerTreeHostClient* client_;
std::unique_ptr<Proxy> proxy_;
std::unique_ptr<TaskRunnerProvider> task_runner_provider_;
int source_frame_number_ = 0U;
SwapPromiseManager swap_promise_manager_;
// |current_layer_tree_frame_sink_| can't be updated until we've successfully
// initialized a new LayerTreeFrameSink. |new_layer_tree_frame_sink_|
// contains the new LayerTreeFrameSink that is currently being initialized.
// If initialization is successful then |new_layer_tree_frame_sink_| replaces
// |current_layer_tree_frame_sink_|.
std::unique_ptr<LayerTreeFrameSink> new_layer_tree_frame_sink_;
std::unique_ptr<LayerTreeFrameSink> current_layer_tree_frame_sink_;
const LayerTreeSettings settings_;
LayerTreeDebugState debug_state_;
bool visible_ = false;
bool has_gpu_rasterization_trigger_ = false;
bool content_has_slow_paths_ = false;
bool content_has_non_aa_paint_ = false;
bool gpu_rasterization_histogram_recorded_ = false;
// If set, then page scale animation has completed, but the client hasn't been
// notified about it yet.
bool did_complete_scale_animation_ = false;
int id_;
bool next_commit_forces_redraw_ = false;
bool next_commit_forces_recalculate_raster_scales_ = false;
// Track when we're inside a main frame to see if compositor is being
// destroyed midway which causes a crash.
bool inside_main_frame_ = false;
TaskGraphRunner* task_graph_runner_;
uint32_t num_consecutive_frames_without_slow_paths_ = 0;
scoped_refptr<Layer> root_layer_;
ViewportLayers viewport_layers_;
// For CompositeAfterPaint.
ViewportPropertyIds viewport_property_ids_;
float top_controls_height_ = 0.f;
float top_controls_shown_ratio_ = 0.f;
bool browser_controls_shrink_blink_size_ = false;
OverscrollBehavior overscroll_behavior_;
float bottom_controls_height_ = 0.f;
float device_scale_factor_ = 1.f;
float painted_device_scale_factor_ = 1.f;
float recording_scale_factor_ = 1.f;
float page_scale_factor_ = 1.f;
float min_page_scale_factor_ = 1.f;
float max_page_scale_factor_ = 1.f;
float external_page_scale_factor_ = 1.f;
int raster_color_space_id_ = -1;
gfx::ColorSpace raster_color_space_;
bool clear_caches_on_next_commit_ = false;
uint32_t content_source_id_;
viz::LocalSurfaceIdAllocation local_surface_id_allocation_from_parent_;
// Used to detect surface invariant violations.
bool has_pushed_local_surface_id_from_parent_ = false;
bool new_local_surface_id_request_ = false;
uint32_t defer_main_frame_update_count_ = 0;
SkColor background_color_ = SK_ColorWHITE;
LayerSelection selection_;
gfx::Size device_viewport_size_;
gfx::Rect viewport_visible_rect_;
bool have_scroll_event_handlers_ = false;
EventListenerProperties event_listener_properties_
[static_cast<size_t>(EventListenerClass::kLast) + 1];
std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
// Whether we have a pending request to force send RenderFrameMetadata with
// the next frame.
bool force_send_metadata_request_ = false;
PropertyTrees property_trees_;
bool needs_full_tree_sync_ = true;
bool needs_surface_ranges_sync_ = false;
gfx::Vector2dF elastic_overscroll_;
scoped_refptr<HeadsUpDisplayLayer> hud_layer_;
// The number of SurfaceLayers that have (fallback,primary) set to
// viz::SurfaceRange.
base::flat_map<viz::SurfaceRange, int> surface_ranges_;
// Set of layers that need to push properties.
base::flat_set<Layer*> layers_that_should_push_properties_;
// Layer id to Layer map.
std::unordered_map<int, Layer*> layer_id_map_;
// In layer-list mode, this map is only used for scrollable layers.
std::unordered_map<ElementId, Layer*, ElementIdHash> element_layers_map_;
// The set of registered element ids when using layer list mode. In non-layer-
// list mode, |element_layers_map_| is used.
ElementIdSet elements_in_property_trees_;
bool in_paint_layer_contents_ = false;
// This is true if atleast one layer in the layer tree has a copy request. We
// use this bool to decide whether we need to compute subtree has copy request
// for every layer during property tree building.
bool has_copy_request_ = false;
MutatorHost* mutator_host_;
std::vector<std::pair<PaintImage, base::OnceCallback<void(bool)>>>
std::unordered_map<int, base::OnceCallback<void(bool)>>
// Presentation time callbacks requested for the next frame are initially
// added here.
std::vector<PresentationTimeCallback> pending_presentation_time_callbacks_;
// Used to vend weak pointers to LayerTreeHost to ScopedDeferMainFrameUpdate
// objects.
base::WeakPtrFactory<LayerTreeHost> defer_main_frame_update_weak_ptr_factory_;
} // namespace cc