blob: 5e440d8828643ac7c1c561294b684bcb97ff1f22 [file] [log] [blame]
// 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.
#include "cc/surfaces/referenced_surface_tracker.h"
#include <utility>
#include "base/logging.h"
namespace cc {
ReferencedSurfaceTracker::ReferencedSurfaceTracker(
const FrameSinkId& frame_sink_id)
: current_surface_id_(frame_sink_id, LocalSurfaceId()) {
DCHECK(current_surface_id_.frame_sink_id().is_valid());
}
ReferencedSurfaceTracker::~ReferencedSurfaceTracker() {}
void ReferencedSurfaceTracker::UpdateReferences(
const LocalSurfaceId& local_surface_id,
const std::vector<SurfaceId>* active_referenced_surfaces) {
DCHECK(local_surface_id.is_valid());
// Clear references to add/remove from the last frame.
references_to_remove_.clear();
references_to_add_.clear();
// If |current_surface_id_| is changing then update |current_surface_id_|.
// Also clear |referenced_surfaces_| because we haven't added any references
// from the new SurfaceId yet.
if (current_surface_id_.local_surface_id() != local_surface_id) {
current_surface_id_ =
SurfaceId(current_surface_id_.frame_sink_id(), local_surface_id);
referenced_surfaces_.clear();
}
std::unordered_set<SurfaceId, SurfaceIdHash> referenced_surface_set;
if (active_referenced_surfaces) {
referenced_surface_set.insert(active_referenced_surfaces->begin(),
active_referenced_surfaces->end());
}
ProcessNewReferences(referenced_surface_set);
}
void ReferencedSurfaceTracker::ProcessNewReferences(
const std::unordered_set<SurfaceId, SurfaceIdHash>&
new_referenced_surfaces) {
// Removed references for each SurfaceId in |referenced_surfaces_| if they
// aren't referenced anymore. Removing from a set invalidates iterators, so
// create a new vector then remove everything in it.
std::vector<SurfaceId> not_referenced;
for (const SurfaceId& surface_id : referenced_surfaces_) {
if (new_referenced_surfaces.count(surface_id) == 0)
not_referenced.push_back(surface_id);
}
for (const SurfaceId& surface_id : not_referenced)
RemoveSurfaceReference(surface_id);
// Add references for each SurfaceId in |new_referenced_surfaces| if they
// aren't already referenced.
for (const SurfaceId& surface_id : new_referenced_surfaces) {
if (referenced_surfaces_.count(surface_id) == 0)
AddSurfaceReference(surface_id);
}
}
void ReferencedSurfaceTracker::AddSurfaceReference(
const SurfaceId& surface_id) {
references_to_add_.push_back(
SurfaceReference(current_surface_id_, surface_id));
referenced_surfaces_.insert(surface_id);
}
void ReferencedSurfaceTracker::RemoveSurfaceReference(
const SurfaceId& surface_id) {
references_to_remove_.push_back(
SurfaceReference(current_surface_id_, surface_id));
referenced_surfaces_.erase(surface_id);
}
} // namespace cc