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// Copyright 2014 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_SERVICE_FRAME_SINKS_SURFACE_RESOURCE_HOLDER_H_
#define COMPONENTS_VIZ_SERVICE_FRAME_SINKS_SURFACE_RESOURCE_HOLDER_H_
#include <unordered_map>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "components/viz/common/resources/resource_id.h"
#include "components/viz/common/resources/returned_resource.h"
#include "components/viz/common/resources/transferable_resource.h"
#include "components/viz/service/viz_service_export.h"
namespace viz {
class SurfaceResourceHolderClient;
// ReservedResourceDelegate is an interface for tracking the lifetime of
// resources. Code which submits resources that are managed fully on the viz
// side (with resource IDs >= kVizReservedRangeStartId) should implement this.
class ReservedResourceDelegate {
public:
virtual ~ReservedResourceDelegate();
virtual void ReceiveFromChild(
const std::vector<TransferableResource>& resources) = 0;
virtual void RefResources(
const std::vector<TransferableResource>& resources) = 0;
virtual void UnrefResources(
const std::vector<ReturnedResource>& resources) = 0;
};
// A SurfaceResourceHolder manages the lifetime of resources submitted by a
// particular SurfaceFactory. Each resource is held by the service until
// it is no longer referenced by any pending frames or by any
// resource providers.
class VIZ_SERVICE_EXPORT SurfaceResourceHolder {
public:
explicit SurfaceResourceHolder(SurfaceResourceHolderClient* client);
SurfaceResourceHolder(const SurfaceResourceHolder&) = delete;
SurfaceResourceHolder& operator=(const SurfaceResourceHolder&) = delete;
~SurfaceResourceHolder();
void Reset();
void ReceiveFromChild(const std::vector<TransferableResource>& resources);
void RefResources(const std::vector<TransferableResource>& resources);
void UnrefResources(std::vector<ReturnedResource> resources);
private:
raw_ptr<SurfaceResourceHolderClient> client_;
struct ResourceRefs {
int refs_received_from_child = 0;
int refs_holding_resource_alive = 0;
gpu::SyncToken sync_token;
};
// Keeps track of the number of users currently in flight for each resource
// ID we've received from the client. When this counter hits zero for a
// particular resource, that ID is available to return to the client with
// the most recently given non-empty sync token.
using ResourceIdInfoMap =
std::unordered_map<ResourceId, ResourceRefs, ResourceIdHasher>;
ResourceIdInfoMap resource_id_info_map_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_FRAME_SINKS_SURFACE_RESOURCE_HOLDER_H_
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