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// Copyright 2016 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.
#ifndef CC_SURFACES_REFERENCED_SURFACE_TRACKER_H_
#define CC_SURFACES_REFERENCED_SURFACE_TRACKER_H_
#include <unordered_set>
#include <vector>
#include "base/macros.h"
#include "cc/surfaces/frame_sink_id.h"
#include "cc/surfaces/surface_id.h"
#include "cc/surfaces/surface_reference.h"
#include "cc/surfaces/surfaces_export.h"
namespace cc {
// Tracks surface references for a client surface. UpdateReferences() should be
// called once per CompositorFrame to populate |references_to_add_| and
// |references_to_remove_|.
class CC_SURFACES_EXPORT ReferencedSurfaceTracker {
public:
explicit ReferencedSurfaceTracker(const FrameSinkId& frame_sink_id);
~ReferencedSurfaceTracker();
const SurfaceId& current_surface_id() const { return current_surface_id_; }
const std::vector<SurfaceReference>& references_to_add() const {
return references_to_add_;
}
const std::vector<SurfaceReference>& references_to_remove() const {
return references_to_remove_;
}
// Update the references for a CompositorFrame. If |local_surface_id| has
// changed then new references will be generated for everything in
// |referenced_surfaces|. Otherwise a diff from the referenced surfaces in the
// last frame will be computed. This should be called once per
// CompositorFrame.
void UpdateReferences(
const LocalSurfaceId& local_surface_id,
const std::vector<SurfaceId>* active_referenced_surfaces);
private:
// Updates |referenced_surfaces_| based on a |new_referenced_surfaces| from a
// CompositorFrame. Populates |references_to_add_| and |references_to_remove_|
// based on the difference between the sets.
void ProcessNewReferences(const std::unordered_set<SurfaceId, SurfaceIdHash>&
new_referenced_surfaces);
// Adds reference from |current_surface_id_| to |surface_id|.
void AddSurfaceReference(const SurfaceId& surface_id);
// Removes reference from |current_surface_id_| to |surface_id|.
void RemoveSurfaceReference(const SurfaceId& surface_id);
// The id of the client surface that is embedding other surfaces.
SurfaceId current_surface_id_;
// TODO(samans): Use the same SurfaceId set that SurfaceManager holds.
// Set of surfaces referenced by the last submitted CompositorFrame.
std::unordered_set<SurfaceId, SurfaceIdHash> referenced_surfaces_;
// References to surfaces that should be added for the next CompositorFrame.
std::vector<SurfaceReference> references_to_add_;
// References to surfaces that should be removed after the next
// CompositorFrame has been submitted and the surfaces are no longer needed by
// |current_surface_id_|.
std::vector<SurfaceReference> references_to_remove_;
DISALLOW_COPY_AND_ASSIGN(ReferencedSurfaceTracker);
};
} // namespace cc
#endif // CC_SURFACES_REFERENCED_SURFACE_TRACKER_H_