allocation.h

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// Copyright 2013 The Flutter 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 FLUTTER_IMPELLER_BASE_ALLOCATION_H_
#define FLUTTER_IMPELLER_BASE_ALLOCATION_H_
 
#include <cstdint>
#include <limits>
#include <memory>
 
#include "flutter/fml/mapping.h"
 
namespace impeller {
 
class Allocation {
 public:
  Allocation();
 
  ~Allocation();
 
  uint8_t* GetBuffer() const;
 
  size_t GetLength() const;
 
  size_t GetReservedLength() const;
 
  [[nodiscard]] bool Truncate(size_t length, bool npot = true);
 
  static uint32_t NextPowerOfTwoSize(uint32_t x);
 
 private:
  uint8_t* buffer_ = nullptr;
  size_t length_ = 0;
  size_t reserved_ = 0;
 
  [[nodiscard]] bool Reserve(size_t reserved);
 
  [[nodiscard]] bool ReserveNPOT(size_t reserved);
 
  Allocation(const Allocation&) = delete;
 
  Allocation& operator=(const Allocation&) = delete;
};
 
std::shared_ptr<fml::Mapping> CreateMappingWithCopy(const uint8_t* contents,
                                                    size_t length);
 
std::shared_ptr<fml::Mapping> CreateMappingFromAllocation(
    const std::shared_ptr<Allocation>& allocation);
 
std::shared_ptr<fml::Mapping> CreateMappingWithString(
    std::shared_ptr<const std::string> string);
 
std::shared_ptr<fml::Mapping> CreateMappingWithString(std::string string);
 
}  // namespace impeller
 
#endif  // FLUTTER_IMPELLER_BASE_ALLOCATION_H_