include/smomo_interface.h

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/*! @file smomo.h
  @brief Interface file for SmoMo which defines the public interface exposed to SmoMo clients.

  @details SmoMo clients use these interfaces to feed SmoMo required info like frame rate, refresh
  rate, these info are used to update SmoMo internal state.
*/

#ifndef __SMOMO_INTERFACE_H__
#define __SMOMO_INTERFACE_H__

#include <sys/types.h>
#include <ui/Fence.h>
#include <cutils/native_handle.h>

#include <vector>
#include <string>

#define TIMED_RENDERING_METADATA_FEATURE 1
#define FRC_FRAME_PACING_FEATURE 1

namespace smomo {

#define SMOMO_LIBRARY_NAME "libsmomo.qti.so"
#define CREATE_SMOMO_INTERFACE_NAME "CreateSmomoInterface"
#define DESTROY_SMOMO_INTERFACE_NAME "DestroySmomoInterface"

#define SMOMO_REVISION_MAJOR (2)
#define SMOMO_REVISION_MINOR (0)
#define SMOMO_VERSION_TAG ((uint16_t) ((SMOMO_REVISION_MAJOR << 8) \
                                          | SMOMO_REVISION_MINOR))

typedef int64_t nsecs_t;

/*! @brief This structure defines the layer stats required by SmoMo.

  @sa SmomoIntf::updateSmomoState
*/
struct SmomoLayerStats {
  std::string name;  // layer full name
  int32_t id;  // layer ID
};

/*! @brief This structure defines the buffer stats required by SmoMo.

  @sa SmomoIntf::CollectLayerStats
  @sa SmomoIntf::ShouldPresentNow
*/
struct SmomoBufferStats {
  int32_t id;  // layer ID
  int32_t queued_frames;  // queued frame count of this layer
  bool auto_timestamp;  // whether timestamp was generated automatically
  nsecs_t timestamp;  // layer buffer's desired present timestamp
  nsecs_t dequeue_latency;  // last dequeue duration
  int64_t key;  // buffer identity
  buffer_handle_t buffer_hnd;  // layer buffer handle
  uint64_t frame_number;
};

enum DisplayType {
  kBuiltin,
  kPluggable,
};

struct DisplayInfo {
  int32_t display_id;
  DisplayType type;
  bool is_primary;
};

/*! @brief SmoMo interface implemented by SmoMo library.

  @details This class declares prototype for SmoMo public interfaces which must be
  implemented by SmoMo library. SmoMo clients will use these methods to feed required
  info to SmoMo implementation.
*/
class SmomoIntf {
 public:
  virtual ~SmomoIntf() = default;

  // 1.0 interface

  /*! @brief Update SmoMo internal state.

    @details This function is called once per each composition so that required layer info are feed
    to SmoMo, the SmoMo uses these info to update its internal state.

    @param[in] layers \link SmomoLayerStats \endlink
    @param[in] refresh_rate current display refresh rate

    @return \link void \endlink
  */
  virtual void UpdateSmomoState(const std::vector<SmomoLayerStats> &layers,
      float refresh_rate) = 0;

  /*! @brief Collect layer buffer stats.

    @details This function is called once new buffer is ready for this layer. It's used to collect
    layer's buffer stats for SmoMo.

    @param[in] \link SmomoBufferStats \endlink

    @return \link void \endlink
  */
  virtual void CollectLayerStats(const SmomoBufferStats &buffer_stats) = 0;

  /*! @brief Is this layer buffer ready to present.

    @details This function is called by SmoMo clients used to check whether this layer buffer is
    due to present.

    @param[in] \link SmomoBufferStats \endlink
    @param[in] next_vsync_time When next VSYNC arrives

    @return \link bool \endlink
  */
  virtual bool ShouldPresentNow(const SmomoBufferStats &buffer_stats,
      const nsecs_t next_vsync_time) = 0;

  /*! @brief Change refresh rate callback type definition.
  */
  using ChangeRefreshRateCallback = std::function<void(int32_t)>;

  /*! @brief Set the callback used by SmoMo to change display refresh rate.

    @details This function is called by SmoMo clients used to set the refresh rate callback.

    @param[in] callback \link ChangeRefreshRateCallback \endlink

    @return \link void \endlink
  */
  virtual void SetChangeRefreshRateCallback(
      const ChangeRefreshRateCallback& callback) = 0;

  /*! @brief Set the refersh rates supported by display.

    @details This function is called to tell SmoMo what refresh rates this display can suport.

    @param[in] refresh_rates The refresh rates supported by the display

    @return \link void \endlink
  */
  virtual void SetDisplayRefreshRates(const std::vector<float> &refresh_rates) = 0;

  /*! @brief Get the current frame rate from SmoMo.

    @details This function is called by SmoMo client to query the current frame rate, which is
    based on the internal state of SmoMo. Client needs to call the UpdateSmomoState API before
    calling this function. SmoMo only returns a valid frame rate when it's settled to a state.

    @return > 0 if valid, -1 if invalid.

    @return \link int \endlink
  */
  virtual int GetFrameRate() = 0;

  // 2.0 interface

  /*! @brief Set layer buffer's present timestamp.

    @details This function is called by SmoMo clients used to indicate buffer has been presented.

    @param[in] layer_id layer id
    @param[in] timestamp buffer's desired present timestamp

    @return \link void \endlink
  */
  virtual void SetPresentTime(const int32_t layer_id, const nsecs_t timestamp) = 0;

  /*! @brief vsync listener.

    @details This function is called by SmoMo clients used to notify Vsync events.

    @param[in] timestamp vsync timestamp

    @return \link void \endlink
  */
  virtual void OnVsync(const nsecs_t timestamp) = 0;

  /*! @brief Is this layer buffer early to present.

    @details This function is called by SmoMo clients used to check whether this layer buffer is
    not ready to present.

    @param[in] layer_id layer id
    @param[in] desired_present_time desired present time

    @return \link bool \endlink
  */
  virtual bool FrameIsEarly(const int32_t layer_id, const nsecs_t desired_present_time) = 0;

  /*! @brief Is this layer buffer late to present.

    @details This function is called by SmoMo clients used to check whether this layer buffer is
    late to present.

    @param[in] layer_id layer id
    @param[in] next_vsync_time When next VSYNC arrives

    @return \link bool \endlink
  */
  virtual bool FrameIsLate(const int32_t layer_id, const nsecs_t next_vsync_time) = 0;

  /*! @brief Sync to display hardware.

    @details This function is called by SmoMo clients used to align with display hardware.

    @param[in] fence present fence
    @param[out] timestamp present fence timestamp

    @return \link bool \endlink
  */
  virtual bool SyncToDisplay(const android::sp<android::Fence>& fence,
      nsecs_t *timestamp) = 0;

  /*! @brief Low latency mode enaled or not.

    @details This function is called by SmoMo clients used to check whether it's
    in low latency mode.

    @return \link bool \endlink
  */
  virtual bool LowLatencyMode() = 0;

  /*! @brief Enable/Disable Refresh Rate change.

    @details This function is called by SmoMo clients used to control
    refresh rate change.

    @return \link void \endlink
  */
  virtual void SetRefreshRateChangeStatus(bool enable) = 0;

};

typedef bool (*CreateSmomoInterface)(uint16_t version, SmomoIntf **interface);
typedef void (*DestroySmomoInterface)(SmomoIntf *interface);

}  // namespace smomo

#endif  // __SMOMO_INTERFACE_H__