text: /*
   * Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
   *
   * SPDX-License-Identifier: BSD-2-Clause
   */
  
  #pragma once
  
  #include <AK/NonnullOwnPtr.h>
  #include <AK/Types.h>
  #include <Kernel/Graphics/GenericFramebufferDevice.h>
  #include <Kernel/Graphics/GenericGraphicsAdapter.h>
  #include <Kernel/Locking/Spinlock.h>
  #include <Kernel/Memory/AnonymousVMObject.h>
  #include <Kernel/PhysicalAddress.h>
  
  namespace Kernel {
  
  class FramebufferDevice final : public GenericFramebufferDevice {
      friend class DeviceManagement;
  
  public:
      static NonnullRefPtr<FramebufferDevice> create(const GenericGraphicsAdapter&, PhysicalAddress, size_t, size_t, size_t);
  
      virtual ErrorOr<Memory::Region*> mmap(Process&, OpenFileDescription&, Memory::VirtualRange const&, u64 offset, int prot, bool shared) override;
  
      virtual void deactivate_writes() override;
      virtual void activate_writes() override;
  
      virtual ErrorOr<void> try_to_initialize() override;
  
      virtual bool multihead_support() const override { return false; }
      virtual bool flushing_support() const override { return false; }
      virtual bool partial_flushing_support() const override { return false; }
      virtual size_t heads_count() const override { return 1; }
      virtual ErrorOr<size_t> buffer_length(size_t head) const override;
      virtual ErrorOr<size_t> pitch(size_t head) const override;
      virtual ErrorOr<size_t> height(size_t head) const override;
      virtual ErrorOr<size_t> width(size_t head) const override;
      virtual ErrorOr<size_t> vertical_offset(size_t head) const override;
      virtual ErrorOr<bool> vertical_offsetted(size_t head) const override;
  
  private:
      virtual ErrorOr<void> set_head_resolution(size_t head, size_t width, size_t height, size_t pitch) override;
      virtual ErrorOr<void> set_head_buffer(size_t head, bool second_buffer) override;
      virtual ErrorOr<void> flush_head_buffer(size_t head) override;
      virtual ErrorOr<void> flush_rectangle(size_t head, FBRect const&) override;
  
      FramebufferDevice(const GenericGraphicsAdapter&, PhysicalAddress, size_t, size_t, size_t);
  
      PhysicalAddress m_framebuffer_address;
      size_t m_framebuffer_pitch { 0 };
      size_t m_framebuffer_width { 0 };
      size_t m_framebuffer_height { 0 };
  
      Spinlock m_activation_lock;
      mutable Mutex m_buffer_offset_lock;
  
      RefPtr<Memory::AnonymousVMObject> m_real_framebuffer_vmobject;
      RefPtr<Memory::AnonymousVMObject> m_swapped_framebuffer_vmobject;
      OwnPtr<Memory::Region> m_real_framebuffer_region;
      OwnPtr<Memory::Region> m_swapped_framebuffer_region;
  
      bool m_graphical_writes_enabled { true };
  
      RefPtr<Memory::AnonymousVMObject> m_userspace_real_framebuffer_vmobject;
      Memory::Region* m_userspace_framebuffer_region { nullptr };
  
      size_t m_y_offset { 0 };
  };
  
  }
  