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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef UI_GFX_OVERLAY_LAYER_ID_H_
#define UI_GFX_OVERLAY_LAYER_ID_H_
#include <stdint.h>
#include <compare>
#include <string>
#include <utility>
#include "base/component_export.h"
namespace gfx {
// A layer ID packing that includes the namespace. Should be stable across
// frames if OS compositor subtree reuse is desired.
// See |SharedQuadState::layer_id| and |SharedQuadState::layer_namespace_id|.
class COMPONENT_EXPORT(GFX) OverlayLayerId {
public:
using NamespaceId = std::pair<uint32_t, uint32_t>;
OverlayLayerId();
// `layer_namespace_id` must be non-zero.
OverlayLayerId(const NamespaceId& layer_namespace_id, uint32_t layer_id);
~OverlayLayerId();
// The set of named layers that Viz make create that do not (or cannot) map
// back to anything in any compositor frames.
enum class VizInternalId : uint32_t {
kInvalid = 0,
kPrimaryPlane,
kDelegatedInkTrail,
};
// Create an `OverlayLayerId` with a zero `layer_namespace_id`, which is
// reserved for internal viz use.
// `layer_id` must be non-zero.
static OverlayLayerId MakeVizInternal(VizInternalId layer_id);
// Create an `OverlayLayerId` with a `layer_namespace_id` of {1,1}.
static OverlayLayerId MakeForTesting(uint32_t layer_id);
auto operator<=>(const OverlayLayerId&) const = default;
std::string ToString() const;
// TODO(crbug.com/324460866): remove when we remove partial delegation.
using SharedQuadStateLayerId = std::pair<NamespaceId, uint32_t>;
SharedQuadStateLayerId shared_quad_state_layer_id() const {
return {layer_namespace_id_, layer_id_};
}
private:
// See `viz::SharedQuadState::layer_namespace_id`.
// A value of 0 is reserved for Viz use.
NamespaceId layer_namespace_id_;
// See `viz::SharedQuadState::layer_id`.
uint32_t layer_id_ = 0;
};
} // namespace gfx
#endif // UI_GFX_OVERLAY_LAYER_ID_H_
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