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/*
* Copyright 2022 The Chromium OS 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 CROSGRALLOC4METADATA_H
#define CROSGRALLOC4METADATA_H
#include <optional>
#include <type_traits>
#include <aidl/android/hardware/graphics/common/BlendMode.h>
#include <aidl/android/hardware/graphics/common/Cta861_3.h>
#include <aidl/android/hardware/graphics/common/Dataspace.h>
#include <aidl/android/hardware/graphics/common/Smpte2086.h>
#include "cros_gralloc_helpers.h"
// Simple replacement for std::optional which is not guarenteed to be memory layout
// stable across ABIs.
template <typename T> struct cros_buffer_optional {
enum class state : uint32_t { VACANT, OCCUPIED };
cros_buffer_optional() = default;
cros_buffer_optional(std::optional<T> v) : occupancy(v ? state::OCCUPIED : state::VACANT)
{
if (v) {
value = *v;
}
}
std::optional<T> to_std_optional() const
{
return occupancy == state::VACANT ? std::nullopt : std::make_optional(value);
}
state occupancy = state::VACANT;
T value;
};
/*
* The metadata for cros_gralloc_buffer-s that should reside in a shared memory region
* instead of directly in cros_gralloc_handle-s.
*
* Any metadata that is mutable must be stored in this shared memory region as
* cros_gralloc_handle-s can not be tracked and updated across processes.
*/
struct cros_gralloc_buffer_metadata {
/*
* Name is stored in the shared memory metadata to simplify cros_gralloc_handle
* creation. This allows us to keep handles small while avoiding variable sized
* handles.
*/
char name[CROS_GRALLOC_BUFFER_METADATA_MAX_NAME_SIZE];
aidl::android::hardware::graphics::common::BlendMode blend_mode;
aidl::android::hardware::graphics::common::Dataspace dataspace;
cros_buffer_optional<aidl::android::hardware::graphics::common::Cta861_3> cta861_3;
cros_buffer_optional<aidl::android::hardware::graphics::common::Smpte2086> smpte2086;
};
static_assert(std::is_standard_layout_v<cros_gralloc_buffer_metadata>);
static_assert(std::is_trivially_copyable_v<cros_gralloc_buffer_metadata>);
#endif
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