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// Copyright 2014 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 <memory>
#include "base/macros.h"
#include "base/time/time.h"
#include "components/viz/common/frame_sinks/begin_frame_source.h"
#include "components/viz/common/surfaces/local_surface_id.h"
#include "components/viz/common/surfaces/parent_local_surface_id_allocator.h"
#include "components/viz/common/surfaces/scoped_surface_id_allocator.h"
#include "content/browser/renderer_host/delegated_frame_host.h"
#include "content/public/common/screen_info.h"
#include "ui/compositor/compositor.h"
#include "ui/compositor/compositor_observer.h"
#include "ui/compositor/layer_observer.h"
#include "ui/display/display.h"
#include "ui/gfx/ca_layer_params.h"
namespace ui {
class AcceleratedWidgetMacNSView;
class RecyclableCompositorMac;
namespace content {
class BrowserCompositorMacClient {
virtual SkColor BrowserCompositorMacGetGutterColor() const = 0;
virtual void BrowserCompositorMacOnBeginFrame(base::TimeTicks frame_time) = 0;
virtual void OnFrameTokenChanged(uint32_t frame_token) = 0;
virtual void DestroyCompositorForShutdown() = 0;
virtual bool OnBrowserCompositorSurfaceIdChanged() = 0;
virtual std::vector<viz::SurfaceId> CollectSurfaceIdsForEviction() = 0;
// This class owns a DelegatedFrameHost, and will dynamically attach and
// detach it from a ui::Compositor as needed. The ui::Compositor will be
// detached from the DelegatedFrameHost when the following conditions are
// all met:
// - The RenderWidgetHostImpl providing frames to the DelegatedFrameHost
// is visible.
// - The RenderWidgetHostViewMac that is used to display these frames is
// attached to the NSView hierarchy of an NSWindow.
class CONTENT_EXPORT BrowserCompositorMac : public DelegatedFrameHostClient,
public ui::LayerObserver {
ui::AcceleratedWidgetMacNSView* accelerated_widget_mac_ns_view,
BrowserCompositorMacClient* client,
bool render_widget_host_is_hidden,
const display::Display& initial_display,
const viz::FrameSinkId& frame_sink_id);
~BrowserCompositorMac() override;
// These will not return nullptr until Destroy is called.
DelegatedFrameHost* GetDelegatedFrameHost();
// Force a new surface id to be allocated. Returns true if the
// RenderWidgetHostImpl sent the resulting surface id to the renderer.
bool ForceNewSurfaceId();
// Return the parameters of the most recently received frame, or nullptr if
// no valid frame is available.
const gfx::CALayerParams* GetLastCALayerParams() const;
void DidCreateNewRendererCompositorFrameSink(
viz::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink);
void OnDidNotProduceFrame(const viz::BeginFrameAck& ack);
void SetBackgroundColor(SkColor background_color);
void UpdateVSyncParameters(const base::TimeTicks& timebase,
const base::TimeDelta& interval);
void SetNeedsBeginFrames(bool needs_begin_frames);
void SetWantsAnimateOnlyBeginFrames();
void TakeFallbackContentFrom(BrowserCompositorMac* other);
// Update the renderer's SurfaceId to reflect the current dimensions of the
// NSView. This will allocate a new SurfaceId if needed. This will return
// true if any properties that need to be communicated to the
// RenderWidgetHostImpl have changed.
bool UpdateSurfaceFromNSView(const gfx::Size& new_size_dip,
const display::Display& new_display);
// Update the renderer's SurfaceId to reflect |new_size_in_pixels| in
// anticipation of the NSView resizing during auto-resize.
void UpdateSurfaceFromChild(
float new_device_scale_factor,
const gfx::Size& new_size_in_pixels,
const viz::LocalSurfaceIdAllocation& child_local_surface_id_allocation);
// This is used to ensure that the ui::Compositor be attached to the
// DelegatedFrameHost while the RWHImpl is visible.
// Note: This should be called before the RWHImpl is made visible and after
// it has been hidden, in order to ensure that thumbnailer notifications to
// initiate copies occur before the ui::Compositor be detached.
void SetRenderWidgetHostIsHidden(bool hidden);
// Specify if the ui::Layer should be visible or not.
void SetViewVisible(bool visible);
// Sets or clears the parent ui::Layer and updates state to reflect that
// we are now using the ui::Compositor from |parent_ui_layer| (if non-nullptr)
// or one from |recyclable_compositor_| (if a compositor is needed).
void SetParentUiLayer(ui::Layer* parent_ui_layer);
viz::FrameSinkId GetRootFrameSinkId();
const gfx::Size& GetRendererSize() const { return dfh_size_dip_; }
void GetRendererScreenInfo(ScreenInfo* screen_info) const;
viz::ScopedSurfaceIdAllocator GetScopedRendererSurfaceIdAllocator(
base::OnceCallback<void()> allocation_task);
const viz::LocalSurfaceIdAllocation& GetRendererLocalSurfaceIdAllocation();
void TransformPointToRootSurface(gfx::PointF* point);
// Indicate that the recyclable compositor should be destroyed, and no future
// compositors should be recycled.
static void DisableRecyclingForShutdown();
// DelegatedFrameHostClient implementation.
ui::Layer* DelegatedFrameHostGetLayer() const override;
bool DelegatedFrameHostIsVisible() const override;
SkColor DelegatedFrameHostGetGutterColor() const override;
void OnBeginFrame(base::TimeTicks frame_time) override;
void OnFrameTokenChanged(uint32_t frame_token) override;
float GetDeviceScaleFactor() const override;
void InvalidateLocalSurfaceIdOnEviction() override;
std::vector<viz::SurfaceId> CollectSurfaceIdsForEviction() override;
bool ShouldShowStaleContentOnEviction() override;
base::WeakPtr<BrowserCompositorMac> GetWeakPtr() {
return weak_factory_.GetWeakPtr();
void DidNavigate();
bool ForceNewSurfaceForTesting();
ui::Compositor* GetCompositor() const;
// ui::LayerObserver implementation:
void LayerDestroyed(ui::Layer* layer) override;
cc::DeadlinePolicy GetDeadlinePolicy(bool is_resize) const;
// The state of |delegated_frame_host_| and |recyclable_compositor_| to
// manage being visible, hidden, or drawn via a ui::Layer.
// The state of |recyclable_compositor_| and |parent_ui_layer_|.
enum State {
// We are drawing using |recyclable_compositor_|. This happens when the
// renderer, but no parent ui::Layer has been specified. This is used by
// content shell, popup windows (time/date picker), and when tab capturing
// a backgrounded tab.
// There is no compositor. This is true when the renderer is not visible
// and no parent ui::Layer is specified.
// We are drawing using |parent_ui_layer_|'s compositor. This happens
// whenever |parent_ui_layer_| is non-nullptr.
State state_ = HasNoCompositor;
void UpdateState();
void TransitionToState(State new_state);
// Weak pointer to the layer supplied and reset via SetParentUiLayer. |this|
// is an observer of |parent_ui_layer_|, to ensure that |parent_ui_layer_|
// always be valid when non-null. The UpdateState function will re-parent
// |root_layer_| to be under |parent_ui_layer_|, if needed.
ui::Layer* parent_ui_layer_ = nullptr;
bool render_widget_host_is_hidden_ = true;
BrowserCompositorMacClient* client_ = nullptr;
ui::AcceleratedWidgetMacNSView* accelerated_widget_mac_ns_view_ = nullptr;
std::unique_ptr<ui::RecyclableCompositorMac> recyclable_compositor_;
std::unique_ptr<DelegatedFrameHost> delegated_frame_host_;
std::unique_ptr<ui::Layer> root_layer_;
SkColor background_color_ = SK_ColorWHITE;
viz::mojom::CompositorFrameSinkClient* renderer_compositor_frame_sink_ =
// The viz::ParentLocalSurfaceIdAllocator for the delegated frame host
// dispenses viz::LocalSurfaceIds that are renderered into by the renderer
// process.
viz::ParentLocalSurfaceIdAllocator dfh_local_surface_id_allocator_;
gfx::Size dfh_size_pixels_;
gfx::Size dfh_size_dip_;
display::Display dfh_display_;
bool is_first_navigation_ = true;
base::WeakPtrFactory<BrowserCompositorMac> weak_factory_;
} // namespace content