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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_CLIENT_FRAME_EVICTOR_H_
#define COMPONENTS_VIZ_CLIENT_FRAME_EVICTOR_H_
#include <vector>
#include "base/memory/raw_ptr.h"
#include "components/viz/client/frame_eviction_manager.h"
#include "components/viz/common/surfaces/surface_id.h"
namespace viz {
class VIZ_CLIENT_EXPORT FrameEvictorClient {
public:
struct VIZ_CLIENT_EXPORT EvictIds {
EvictIds();
~EvictIds();
EvictIds(const EvictIds&) = delete;
EvictIds& operator=(const EvictIds&) = delete;
EvictIds(EvictIds&& other);
EvictIds& operator=(EvictIds&& other);
// `embedded_ids` contains a list of SurfaceIds embedded by the UI
// compositor.
std::vector<SurfaceId> embedded_ids;
};
virtual ~FrameEvictorClient() = default;
virtual void EvictDelegatedFrame(
const std::vector<SurfaceId>& surface_ids) = 0;
virtual EvictIds CollectSurfaceIdsForEviction() const = 0;
virtual SurfaceId GetCurrentSurfaceId() const = 0;
virtual SurfaceId GetPreNavigationSurfaceId() const = 0;
};
// Keeps track of the visibility state of a child and notifies when the parent
// needs to drop its surface.
class VIZ_CLIENT_EXPORT FrameEvictor : public FrameEvictionManagerClient {
public:
explicit FrameEvictor(FrameEvictorClient* client);
FrameEvictor(const FrameEvictor&) = delete;
FrameEvictor& operator=(const FrameEvictor&) = delete;
~FrameEvictor() override;
// Called when the parent allocates a new LocalSurfaceId for this child and
// embeds it.
void OnNewSurfaceEmbedded();
// Called when the parent stops embedding the child's surface and evicts it.
void OnSurfaceDiscarded();
// Returns whether the parent is currently embedding a surface of this child.
bool has_surface() const { return has_surface_; }
// Notifies that the visibility state of the child has changed.
void SetVisible(bool visible);
bool visible() const { return visible_; }
// Returns an ordered collection of `SurfaceIds` that should be evicted.
std::vector<SurfaceId> CollectSurfaceIdsForEviction() const;
private:
// FrameEvictionManagerClient implementation.
void EvictCurrentFrame() override;
raw_ptr<FrameEvictorClient> client_;
bool has_surface_ = false;
bool visible_ = false;
};
} // namespace viz
#endif // COMPONENTS_VIZ_CLIENT_FRAME_EVICTOR_H_
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