blob: d1352c059e0ef414e36408648d389b479aab9e28 [file] [log] [blame]
// Copyright (c) 2012 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 <stdint.h>
#include <memory>
#include <string>
#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "base/single_thread_task_runner.h"
#include "base/time/time.h"
#include "build/build_config.h"
#include "cc/trees/element_id.h"
#include "cc/trees/layer_tree_host.h"
#include "cc/trees/layer_tree_host_client.h"
#include "cc/trees/layer_tree_host_single_thread_client.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
#include "components/viz/common/surfaces/frame_sink_id.h"
#include "components/viz/common/surfaces/local_surface_id_allocation.h"
#include "components/viz/host/host_frame_sink_client.h"
#include "services/viz/privileged/interfaces/compositing/vsync_parameter_observer.mojom-forward.h"
#include "third_party/skia/include/core/SkColor.h"
#include "third_party/skia/include/core/SkMatrix44.h"
#include "ui/compositor/compositor_animation_observer.h"
#include "ui/compositor/compositor_export.h"
#include "ui/compositor/compositor_lock.h"
#include "ui/compositor/compositor_observer.h"
#include "ui/compositor/external_begin_frame_client.h"
#include "ui/compositor/layer_animator_collection.h"
#include "ui/gfx/color_space.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d.h"
#include "ui/gfx/gpu_memory_buffer.h"
#include "ui/gfx/native_widget_types.h"
namespace base {
class SingleThreadTaskRunner;
namespace cc {
class AnimationHost;
class AnimationTimeline;
class Layer;
class LayerTreeDebugState;
class LayerTreeFrameSink;
class TaskGraphRunner;
namespace gfx {
struct PresentationFeedback;
class Rect;
class ScrollOffset;
class Size;
namespace gpu {
class GpuMemoryBufferManager;
namespace viz {
class FrameSinkManagerImpl;
class ContextProvider;
class HostFrameSinkManager;
class RasterContextProvider;
namespace ui {
class Compositor;
class ExternalBeginFrameClient;
class LatencyInfo;
class Layer;
class Reflector;
class ScopedAnimationDurationScaleMode;
class ScrollInputHandler;
constexpr int kCompositorLockTimeoutMs = 67;
class COMPOSITOR_EXPORT ContextFactoryObserver {
virtual ~ContextFactoryObserver() {}
// Notifies that the viz::ContextProviders returned from
// ui::ContextFactory::SharedMainThreadContextProvider and/or
// ui::ContextFactory::SharedMainThreadRasterContextProvider were lost.
// When this is called, the old resources (e.g. shared context, GL helper)
// still exist, but are about to be destroyed. Getting a reference to those
// resources from the ContextFactory (e.g. through
// SharedMainThreadContextProvider()) will return newly recreated, valid
// resources.
virtual void OnLostSharedContext() = 0;
// This is privileged interface to the compositor. It is a global object.
class COMPOSITOR_EXPORT ContextFactoryPrivate {
virtual ~ContextFactoryPrivate() {}
// Creates a reflector that copies the content of the |mirrored_compositor|
// onto |mirroring_layer|.
virtual std::unique_ptr<Reflector> CreateReflector(
Compositor* mirrored_compositor,
Layer* mirroring_layer) = 0;
// Removes the reflector, which stops the mirroring.
virtual void RemoveReflector(Reflector* reflector) = 0;
// Allocate a new client ID for the display compositor.
virtual viz::FrameSinkId AllocateFrameSinkId() = 0;
// Gets the frame sink manager.
virtual viz::FrameSinkManagerImpl* GetFrameSinkManager() = 0;
// Gets the frame sink manager host instance.
virtual viz::HostFrameSinkManager* GetHostFrameSinkManager() = 0;
// Inform the display corresponding to this compositor if it is visible. When
// false it does not need to produce any frames. Visibility is reset for each
// call to CreateLayerTreeFrameSink.
virtual void SetDisplayVisible(ui::Compositor* compositor, bool visible) = 0;
// Resize the display corresponding to this compositor to a particular size.
virtual void ResizeDisplay(ui::Compositor* compositor,
const gfx::Size& size) = 0;
// Attempts to immediately swap a frame with the current size if possible,
// then will no longer swap until ResizeDisplay() is called.
virtual void DisableSwapUntilResize(ui::Compositor* compositor) = 0;
// Sets the color matrix used to transform how all output is drawn to the
// display underlying this ui::Compositor.
virtual void SetDisplayColorMatrix(ui::Compositor* compositor,
const SkMatrix44& matrix) = 0;
// Set the output color profile into which this compositor should render.
virtual void SetDisplayColorSpace(
ui::Compositor* compositor,
const gfx::ColorSpace& blending_color_space,
const gfx::ColorSpace& output_color_space) = 0;
// Mac path for transporting vsync parameters to the display. Other platforms
// update it via the BrowserCompositorLayerTreeFrameSink directly.
virtual void SetDisplayVSyncParameters(ui::Compositor* compositor,
base::TimeTicks timebase,
base::TimeDelta interval) = 0;
virtual void IssueExternalBeginFrame(ui::Compositor* compositor,
const viz::BeginFrameArgs& args) = 0;
virtual void SetOutputIsSecure(Compositor* compositor, bool secure) = 0;
// Adds an observer for vsync parameter changes.
virtual void AddVSyncParameterObserver(
Compositor* compositor,
viz::mojom::VSyncParameterObserverPtr observer) = 0;
// This class abstracts the creation of the 3D context for the compositor. It is
// a global object.
class COMPOSITOR_EXPORT ContextFactory {
virtual ~ContextFactory() {}
// Creates an output surface for the given compositor. The factory may keep
// per-compositor data (e.g. a shared context), that needs to be cleaned up
// by calling RemoveCompositor when the compositor gets destroyed.
virtual void CreateLayerTreeFrameSink(
base::WeakPtr<Compositor> compositor) = 0;
// Return a reference to a shared offscreen context provider usable from the
// main thread.
virtual scoped_refptr<viz::ContextProvider>
SharedMainThreadContextProvider() = 0;
// Return a reference to a shared offscreen context provider usable from the
// main thread.
virtual scoped_refptr<viz::RasterContextProvider>
SharedMainThreadRasterContextProvider() = 0;
// Destroys per-compositor data.
virtual void RemoveCompositor(Compositor* compositor) = 0;
// Gets the GPU memory buffer manager.
virtual gpu::GpuMemoryBufferManager* GetGpuMemoryBufferManager() = 0;
// Gets the task graph runner.
virtual cc::TaskGraphRunner* GetTaskGraphRunner() = 0;
virtual void AddObserver(ContextFactoryObserver* observer) = 0;
virtual void RemoveObserver(ContextFactoryObserver* observer) = 0;
virtual bool SyncTokensRequiredForDisplayCompositor() = 0;
// Compositor object to take care of GPU painting.
// A Browser compositor object is responsible for generating the final
// displayable form of pixels comprising a single widget's contents. It draws an
// appropriately transformed texture for each transformed view in the widget's
// view hierarchy.
class COMPOSITOR_EXPORT Compositor : public cc::LayerTreeHostClient,
public cc::LayerTreeHostSingleThreadClient,
public viz::HostFrameSinkClient {
// |trace_environment_name| is passed to trace events so that tracing
// can identify the environment the trace events are from. Examples are,
// "ash", and "browser". If no value is supplied, "browser" is used.
Compositor(const viz::FrameSinkId& frame_sink_id,
ui::ContextFactory* context_factory,
ui::ContextFactoryPrivate* context_factory_private,
scoped_refptr<base::SingleThreadTaskRunner> task_runner,
bool enable_pixel_canvas,
ExternalBeginFrameClient* external_begin_frame_client = nullptr,
bool force_software_compositor = false,
const char* trace_environment_name = nullptr);
~Compositor() override;
ui::ContextFactory* context_factory() { return context_factory_; }
ui::ContextFactoryPrivate* context_factory_private() {
return context_factory_private_;
void AddChildFrameSink(const viz::FrameSinkId& frame_sink_id);
void RemoveChildFrameSink(const viz::FrameSinkId& frame_sink_id);
void SetLayerTreeFrameSink(std::unique_ptr<cc::LayerTreeFrameSink> surface);
// Called when a child surface is about to resize.
void OnChildResizing();
// Schedules a redraw of the layer tree associated with this compositor.
void ScheduleDraw();
// Sets the root of the layer tree drawn by this Compositor. The root layer
// must have no parent. The compositor's root layer is reset if the root layer
// is destroyed. NULL can be passed to reset the root layer, in which case the
// compositor will stop drawing anything.
// The Compositor does not own the root layer.
const Layer* root_layer() const { return root_layer_; }
Layer* root_layer() { return root_layer_; }
void SetRootLayer(Layer* root_layer);
cc::AnimationTimeline* GetAnimationTimeline() const;
// The scale factor of the device that this compositor is
// compositing layers on.
float device_scale_factor() const { return device_scale_factor_; }
// The color space of the device that this compositor is being displayed on.
const gfx::ColorSpace& output_color_space() const {
return output_color_space_;
// Gets and sets the color matrix used to transform the output colors of what
// this compositor renders.
const SkMatrix44& display_color_matrix() const {
return display_color_matrix_;
void SetDisplayColorMatrix(const SkMatrix44& matrix);
// Where possible, draws are scissored to a damage region calculated from
// changes to layer properties. This bypasses that and indicates that
// the whole frame needs to be drawn.
void ScheduleFullRedraw();
// Schedule redraw and append damage_rect to the damage region calculated
// from changes to layer properties.
void ScheduleRedrawRect(const gfx::Rect& damage_rect);
// Finishes all outstanding rendering and disables swapping on this surface
// until it is resized.
void DisableSwapUntilResize();
void ReenableSwap();
void SetLatencyInfo(const LatencyInfo& latency_info);
// Sets the compositor's device scale factor and size.
void SetScaleAndSize(
float scale,
const gfx::Size& size_in_pixel,
const viz::LocalSurfaceIdAllocation& local_surface_id_allocation);
// Updates the LocalSurfaceIdAllocation from the parent.
viz::LocalSurfaceIdAllocation UpdateLocalSurfaceIdFromParent(
const viz::LocalSurfaceIdAllocation& local_surface_id_allocation);
// Returns the current LocalSurfaceIdAllocation, which may not be valid.
viz::LocalSurfaceIdAllocation GetLocalSurfaceIdAllocation() const;
// Returns a new LocalSurfaceIdAllocation by incrementing the child sequence
// number.
viz::LocalSurfaceIdAllocation RequestNewChildLocalSurfaceId();
// Set the output color profile into which this compositor should render. Also
// sets the SDR white level (in nits) used to scale HDR color space primaries.
void SetDisplayColorSpace(
const gfx::ColorSpace& color_space,
float sdr_white_level = gfx::ColorSpace::kDefaultSDRWhiteLevel);
// Returns the size of the widget that is being drawn to in pixel coordinates.
const gfx::Size& size() const { return size_; }
// Sets the background color used for areas that aren't covered by
// the |root_layer|.
void SetBackgroundColor(SkColor color);
// Sets the visibility of the underlying compositor.
void SetVisible(bool visible);
// Gets the visibility of the underlying compositor.
bool IsVisible();
// Gets or sets the scroll offset for the given layer in step with the
// cc::InputHandler. Returns true if the layer is active on the impl side.
bool GetScrollOffsetForLayer(cc::ElementId element_id,
gfx::ScrollOffset* offset) const;
bool ScrollLayerTo(cc::ElementId element_id, const gfx::ScrollOffset& offset);
// Mac sets vsync parameters through the browser compositor rather than from
// the GPU.
void SetDisplayVSyncParameters(base::TimeTicks timebase,
base::TimeDelta interval);
void AddVSyncParameterObserver(
viz::mojom::VSyncParameterObserverPtr observer);
// Sets the widget for the compositor to render into.
void SetAcceleratedWidget(gfx::AcceleratedWidget widget);
// Releases the widget previously set through SetAcceleratedWidget().
// After returning it will not be used for rendering anymore.
// The compositor must be set to invisible when taking away a widget.
gfx::AcceleratedWidget ReleaseAcceleratedWidget();
gfx::AcceleratedWidget widget() const;
// This flag is used to force a compositor into software compositing even tho
// in general chrome is using gpu compositing. This allows the compositor to
// be created without a gpu context, and does not go through the gpu path at
// all. This flag can not be used with a compositor that embeds any external
// content via a SurfaceLayer, as they would not agree on what compositing
// mode to use for resources, but may be used eg for tooltip windows.
bool force_software_compositor() { return force_software_compositor_; }
// Returns the main thread task runner this compositor uses. Users of the
// compositor generally shouldn't use this.
scoped_refptr<base::SingleThreadTaskRunner> task_runner() const {
return task_runner_;
// Compositor does not own observers. It is the responsibility of the
// observer to remove itself when it is done observing.
void AddObserver(CompositorObserver* observer);
void RemoveObserver(CompositorObserver* observer);
bool HasObserver(const CompositorObserver* observer) const;
void AddAnimationObserver(CompositorAnimationObserver* observer);
void RemoveAnimationObserver(CompositorAnimationObserver* observer);
bool HasAnimationObserver(const CompositorAnimationObserver* observer) const;
// Creates a compositor lock. Returns NULL if it is not possible to lock at
// this time (i.e. we're waiting to complete a previous unlock). If the
// timeout is null, then no timeout is used.
std::unique_ptr<CompositorLock> GetCompositorLock(
CompositorLockClient* client,
base::TimeDelta timeout =
base::TimeDelta::FromMilliseconds(kCompositorLockTimeoutMs)) {
return lock_manager_.GetCompositorLock(client, timeout,
// 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).
// See ui/gfx/presentation_feedback.h for details on the args (TimeTicks is
// always non-zero).
using PresentationTimeCallback =
base::OnceCallback<void(const gfx::PresentationFeedback&)>;
void RequestPresentationTimeForNextFrame(PresentationTimeCallback callback);
// LayerTreeHostClient implementation.
void WillBeginMainFrame() override {}
void DidBeginMainFrame() override {}
void WillUpdateLayers() override {}
void DidUpdateLayers() override;
void BeginMainFrame(const viz::BeginFrameArgs& args) override;
void BeginMainFrameNotExpectedSoon() override;
void BeginMainFrameNotExpectedUntil(base::TimeTicks time) override;
void UpdateLayerTreeHost() override;
void ApplyViewportChanges(const cc::ApplyViewportChangesArgs& args) override {
void RecordWheelAndTouchScrollingCount(bool has_scrolled_by_wheel,
bool has_scrolled_by_touch) override {}
void SendOverscrollEventFromImplSide(
const gfx::Vector2dF& overscroll_delta,
cc::ElementId scroll_latched_element_id) override {}
void SendScrollEndEventFromImplSide(
cc::ElementId scroll_latched_element_id) override {}
void RequestNewLayerTreeFrameSink() override;
void DidInitializeLayerTreeFrameSink() override {}
void DidFailToInitializeLayerTreeFrameSink() override;
void WillCommit() override {}
void DidCommit() override;
void DidCommitAndDrawFrame() override {}
void DidReceiveCompositorFrameAck() override;
void DidCompletePageScaleAnimation() override {}
void DidPresentCompositorFrame(
uint32_t frame_token,
const gfx::PresentationFeedback& feedback) override;
void RecordStartOfFrameMetrics() override {}
void RecordEndOfFrameMetrics(base::TimeTicks frame_begin_time) override {}
void DidGenerateLocalSurfaceIdAllocation(
const viz::LocalSurfaceIdAllocation& allocation) override;
// cc::LayerTreeHostSingleThreadClient implementation.
void DidSubmitCompositorFrame() override;
void DidLoseLayerTreeFrameSink() override {}
void FrameIntervalUpdated(base::TimeDelta interval) override;
// viz::HostFrameSinkClient implementation.
void OnFirstSurfaceActivation(const viz::SurfaceInfo& surface_info) override;
void OnFrameTokenChanged(uint32_t frame_token) override;
bool IsLocked() { return lock_manager_.IsLocked(); }
void SetOutputIsSecure(bool output_is_secure);
const cc::LayerTreeDebugState& GetLayerTreeDebugState() const;
void SetLayerTreeDebugState(const cc::LayerTreeDebugState& debug_state);
LayerAnimatorCollection* layer_animator_collection() {
return &layer_animator_collection_;
const viz::FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
int activated_frame_count() const { return activated_frame_count_; }
float refresh_rate() const { return refresh_rate_; }
ExternalBeginFrameClient* external_begin_frame_client() {
return external_begin_frame_client_;
void SetAllowLocksToExtendTimeout(bool allowed) {
// If true, all paint commands are recorded at pixel size instead of DIP.
bool is_pixel_canvas() const { return is_pixel_canvas_; }
ScrollInputHandler* scroll_input_handler() const {
return scroll_input_handler_.get();
friend class base::RefCounted<Compositor>;
gfx::Size size_;
ui::ContextFactory* context_factory_;
ui::ContextFactoryPrivate* context_factory_private_;
// The root of the Layer tree drawn by this compositor.
Layer* root_layer_ = nullptr;
base::ObserverList<CompositorObserver, true>::Unchecked observer_list_;
gfx::AcceleratedWidget widget_ = gfx::kNullAcceleratedWidget;
// A sequence number of a current compositor frame for use with metrics.
int activated_frame_count_ = 0;
// Current vsync refresh rate per second. Initialized to 60hz as a reasonable
// value until first begin frame arrives with the real refresh rate.
float refresh_rate_ = 60.f;
// A map from child id to parent id.
std::unordered_set<viz::FrameSinkId, viz::FrameSinkIdHash> child_frame_sinks_;
bool widget_valid_ = false;
bool layer_tree_frame_sink_requested_ = false;
const viz::FrameSinkId frame_sink_id_;
scoped_refptr<cc::Layer> root_web_layer_;
std::unique_ptr<cc::AnimationHost> animation_host_;
std::unique_ptr<cc::LayerTreeHost> host_;
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
// Snapshot of last set vsync parameters, to avoid redundant IPCs.
base::TimeTicks vsync_timebase_;
base::TimeDelta vsync_interval_;
ExternalBeginFrameClient* const external_begin_frame_client_;
const bool force_software_compositor_;
// The device scale factor of the monitor that this compositor is compositing
// layers on.
float device_scale_factor_ = 0.f;
LayerAnimatorCollection layer_animator_collection_;
scoped_refptr<cc::AnimationTimeline> animation_timeline_;
std::unique_ptr<ScopedAnimationDurationScaleMode> slow_animations_;
SkMatrix44 display_color_matrix_;
gfx::ColorSpace output_color_space_;
gfx::ColorSpace blending_color_space_;
float sdr_white_level_ = gfx::ColorSpace::kDefaultSDRWhiteLevel;
// If true, all paint commands are recorded at pixel size instead of DIP.
const bool is_pixel_canvas_;
CompositorLockManager lock_manager_;
std::unique_ptr<ScrollInputHandler> scroll_input_handler_;
// Set in DisableSwapUntilResize and reset when a resize happens.
bool disabled_swap_until_resize_ = false;
const char* trace_environment_name_;
viz::LocalSurfaceIdAllocation last_local_surface_id_allocation_;
base::WeakPtrFactory<Compositor> context_creation_weak_ptr_factory_;
} // namespace ui