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namespace mozilla {
namespace widget {

typedef struct gbm_device* (*CreateDeviceFunc)(int);
typedef struct gbm_bo* (*CreateFunc)(struct gbm_device*, uint32_t, uint32_t,
                                     uint32_t, uint32_t);
typedef struct gbm_bo* (*CreateWithModifiersFunc)(struct gbm_device*, uint32_t,
                                                  uint32_t, uint32_t,
                                                  const uint64_t*,
                                                  const unsigned int);
typedef uint64_t (*GetModifierFunc)(struct gbm_bo*);
typedef uint32_t (*GetStrideFunc)(struct gbm_bo*);
typedef int (*GetFdFunc)(struct gbm_bo*);
typedef void (*DestroyFunc)(struct gbm_bo*);
typedef void* (*MapFunc)(struct gbm_bo*, uint32_t, uint32_t, uint32_t, uint32_t,
                         uint32_t, uint32_t*, void**);
typedef void (*UnmapFunc)(struct gbm_bo*, void*);
typedef int (*GetPlaneCountFunc)(struct gbm_bo*);
typedef union gbm_bo_handle (*GetHandleForPlaneFunc)(struct gbm_bo*, int);
typedef uint32_t (*GetStrideForPlaneFunc)(struct gbm_bo*, int);
typedef uint32_t (*GetOffsetFunc)(struct gbm_bo*, int);
typedef int (*DeviceIsFormatSupportedFunc)(struct gbm_device*, uint32_t,
                                           uint32_t);
typedef int (*DrmPrimeHandleToFDFunc)(int, uint32_t, uint32_t, int*);

class nsGbmLib {
 public:
  static bool Load();
  static bool IsLoaded();
  static bool IsAvailable();
  static bool IsModifierAvailable();

  static struct gbm_device* CreateDevice(int fd) { return sCreateDevice(fd); };
  static struct gbm_bo* Create(struct gbm_device* gbm, uint32_t width,
                               uint32_t height, uint32_t format,
                               uint32_t flags) {
    return sCreate(gbm, width, height, format, flags);
  }
  static void Destroy(struct gbm_bo* bo) { sDestroy(bo); }
  static uint32_t GetStride(struct gbm_bo* bo) { return sGetStride(bo); }
  static int GetFd(struct gbm_bo* bo) { return sGetFd(bo); }
  static void* Map(struct gbm_bo* bo, uint32_t x, uint32_t y, uint32_t width,
                   uint32_t height, uint32_t flags, uint32_t* stride,
                   void** map_data) {
    return sMap(bo, x, y, width, height, flags, stride, map_data);
  }
  static void Unmap(struct gbm_bo* bo, void* map_data) { sUnmap(bo, map_data); }
  static struct gbm_bo* CreateWithModifiers(struct gbm_device* gbm,
                                            uint32_t width, uint32_t height,
                                            uint32_t format,
                                            const uint64_t* modifiers,
                                            const unsigned int count) {
    return sCreateWithModifiers(gbm, width, height, format, modifiers, count);
  }
  static uint64_t GetModifier(struct gbm_bo* bo) { return sGetModifier(bo); }
  static int GetPlaneCount(struct gbm_bo* bo) { return sGetPlaneCount(bo); }
  static union gbm_bo_handle GetHandleForPlane(struct gbm_bo* bo, int plane) {
    return sGetHandleForPlane(bo, plane);
  }
  static uint32_t GetStrideForPlane(struct gbm_bo* bo, int plane) {
    return sGetStrideForPlane(bo, plane);
  }
  static uint32_t GetOffset(struct gbm_bo* bo, int plane) {
    return sGetOffset(bo, plane);
  }
  static int DeviceIsFormatSupported(struct gbm_device* gbm, uint32_t format,
                                     uint32_t usage) {
    return sDeviceIsFormatSupported(gbm, format, usage);
  }

  static int DrmPrimeHandleToFD(int fd, uint32_t handle, uint32_t flags,
                                int* prime_fd) {
    return sDrmPrimeHandleToFD(fd, handle, flags, prime_fd);
  }

 private:
  static CreateDeviceFunc sCreateDevice;
  static CreateFunc sCreate;
  static CreateWithModifiersFunc sCreateWithModifiers;
  static GetModifierFunc sGetModifier;
  static GetStrideFunc sGetStride;
  static GetFdFunc sGetFd;
  static DestroyFunc sDestroy;
  static MapFunc sMap;
  static UnmapFunc sUnmap;
  static GetPlaneCountFunc sGetPlaneCount;
  static GetHandleForPlaneFunc sGetHandleForPlane;
  static GetStrideForPlaneFunc sGetStrideForPlane;
  static GetOffsetFunc sGetOffset;
  static DeviceIsFormatSupportedFunc sDeviceIsFormatSupported;
  static DrmPrimeHandleToFDFunc sDrmPrimeHandleToFD;

  static void* sGbmLibHandle;
  static void* sXf86DrmLibHandle;
  static bool sLibLoaded;
};

struct GbmFormat {
  bool mIsSupported;
  bool mHasAlpha;
  int mFormat;
  uint64_t* mModifiers;
  int mModifiersCount;
};

class nsDMABufDevice {
 public:
  nsDMABufDevice();
  ~nsDMABufDevice();

  gbm_device* GetGbmDevice();
  // Returns -1 if we fails to gbm device file descriptor.
  int GetGbmDeviceFd();

  // Use dmabuf for WebRender general web content
  bool IsDMABufTexturesEnabled();
  // Use dmabuf for VA-API video playback
  bool IsDMABufVAAPIEnabled();
  // Use dmabuf for WebGL content
  bool IsDMABufWebGLEnabled();

  GbmFormat* GetGbmFormat(bool aHasAlpha);
  GbmFormat* GetExactGbmFormat(int aFormat);
  void ResetFormatsModifiers();
  void AddFormatModifier(bool aHasAlpha, int aFormat, uint32_t mModifierHi,
                         uint32_t mModifierLo);

 private:
  bool IsDMABufEnabled();
  bool Configure();

  void* mRegistry;

  GbmFormat mXRGBFormat;
  GbmFormat mARGBFormat;

  gbm_device* mGbmDevice;
  int mGbmFd;
};

nsDMABufDevice* GetDMABufDevice();

}  // namespace widget
}  // namespace mozilla