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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.
#include "components/viz/service/frame_sinks/referenced_surface_tracker.h"
#include "base/logging.h"
namespace viz {
void GetSurfaceReferenceDifference(
const SurfaceId& parent_surface_id,
const base::flat_set<SurfaceId>& old_referenced_surfaces,
const base::flat_set<SurfaceId>& new_referenced_surfaces,
std::vector<SurfaceReference>* references_to_add,
std::vector<SurfaceReference>* references_to_remove) {
DCHECK(parent_surface_id.is_valid());
// Find SurfaceIds in |old_referenced_surfaces| that aren't referenced
// anymore.
for (const SurfaceId& surface_id : old_referenced_surfaces) {
if (new_referenced_surfaces.count(surface_id) == 0) {
references_to_remove->push_back(
SurfaceReference(parent_surface_id, surface_id));
}
}
// Find SurfaceIds in |new_referenced_surfaces| that aren't already
// referenced.
for (const SurfaceId& surface_id : new_referenced_surfaces) {
if (old_referenced_surfaces.count(surface_id) == 0) {
references_to_add->push_back(
SurfaceReference(parent_surface_id, surface_id));
}
}
}
} // namespace viz
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