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// Copyright 2018 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_COMMON_SURFACES_SURFACE_RANGE_H_
#define COMPONENTS_VIZ_COMMON_SURFACES_SURFACE_RANGE_H_
#include <compare>
#include <optional>
#include <string>
#include "components/viz/common/surfaces/surface_id.h"
#include "components/viz/common/viz_common_export.h"
#include "mojo/public/cpp/bindings/struct_traits.h"
namespace viz {
namespace mojom {
class SurfaceRangeDataView;
}
// SurfaceRange consists of two SurfaceIds representing a range of surfaces
// [start,end] ordered by SurfaceId where |start| is an optional surface
// which acts like a "fallback" surface in case it exists.
class VIZ_COMMON_EXPORT SurfaceRange {
public:
SurfaceRange();
SurfaceRange(const std::optional<SurfaceId>& start, const SurfaceId& end);
explicit SurfaceRange(const SurfaceId& surface_id);
SurfaceRange(const SurfaceRange& other);
SurfaceRange& operator=(const SurfaceRange& other);
friend std::strong_ordering operator<=>(const SurfaceRange&,
const SurfaceRange&) = default;
// Check if |surface_id| falls within |this| SurfaceRange but is neither the
// start nor end of the range. The FrameSinkId of |surface_id| must match
// either the start or end of the range.
bool IsInRangeExclusive(const SurfaceId& surface_id) const;
// Check if |surface_id| falls within |this| SurfaceRange inclusive of the
// start and end of the range. The FrameSinkId of |surface_id| must match
// either the start or end of the range.
bool IsInRangeInclusive(const SurfaceId& surface_id) const;
// Returns whether the start and end of the range have differing FrameSinkIds.
bool HasDifferentFrameSinkIds() const;
// Returns whether the start and end of the range have different embed tokens.
bool HasDifferentEmbedTokens() const;
bool IsValid() const;
const std::optional<SurfaceId>& start() const { return start_; }
const SurfaceId& end() const { return end_; }
std::string ToString() const;
private:
friend struct mojo::StructTraits<mojom::SurfaceRangeDataView, SurfaceRange>;
std::optional<SurfaceId> start_;
SurfaceId end_;
};
VIZ_COMMON_EXPORT std::ostream& operator<<(std::ostream& out,
const SurfaceRange& surface_range);
} // namespace viz
#endif // COMPONENTS_VIZ_COMMON_SURFACES_SURFACE_RANGE_H_
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