blockallocator.hh

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/*
 * Scroom - Generic viewer for 2D data
 * Copyright (C) 2009-2026 Kees-Jan Dijkzeul
 *
 * SPDX-License-Identifier: LGPL-2.1
 */
 
#pragma once
 
#include <cstdint>
#include <list>
#include <memory>
#include <utility>
 
#include <scroom/interface.hh>
 
namespace Scroom::MemoryBlocks
{
  namespace RawPageData
  {
    using Ptr = std::shared_ptr<uint8_t>;
    using WeakPtr = std::weak_ptr<uint8_t>;
  } // namespace RawPageData
 
  class BlockInterface;
 
  class Page
  {
  private:
    std::shared_ptr<BlockInterface> bi;
    size_t id;
 
  public:
    Page(std::shared_ptr<BlockInterface> bi, size_t id);
 
    RawPageData::Ptr get();
  };
 
  using PageList = std::list<Page>;
 
  class BlockInterface : private Interface
  {
  public:
    using Ptr = std::shared_ptr<BlockInterface>;
    using WeakPtr = std::weak_ptr<BlockInterface>;
 
  protected:
    virtual RawPageData::Ptr get(size_t id) = 0;
 
  public:
    virtual PageList getPages() = 0;
 
    friend class Page;
  };
 
  class BlockFactoryInterface : private Interface
  {
  public:
    using Ptr = std::shared_ptr<BlockFactoryInterface>;
 
    virtual BlockInterface::Ptr create(size_t count, size_t size) = 0;
  };
 
  BlockFactoryInterface::Ptr getBlockFactoryInterface();
 
  // implementation
 
  inline Page::Page(BlockInterface::Ptr bi_, size_t id_)
    : bi(std::move(bi_))
    , id(id_)
  {
  }
 
  inline RawPageData::Ptr Page::get() { return bi->get(id); }
} // namespace Scroom::MemoryBlocks