composer/hwc_callbacks.h

/*
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#ifndef __HWC_CALLBACKS_H__
#define __HWC_CALLBACKS_H__

#define HWC2_INCLUDE_STRINGIFICATION
#define HWC2_USE_CPP11
#include <utils/locker.h>
#include <hardware/hwcomposer2.h>
#undef HWC2_INCLUDE_STRINGIFICATION
#undef HWC2_USE_CPP11

namespace sdm {

class HWCCallbacks {
 public:
  static const int kNumBuiltIn = 4;
  static const int kNumPluggable = 4;
  static const int kNumVirtual = 4;
  // Add 1 primary display which can be either a builtin or pluggable.
  // Async powermode update requires dummy hwc displays.
  // Limit dummy displays to builtin/pluggable type for now.
  static const int kNumRealDisplays = 1 + kNumBuiltIn + kNumPluggable + kNumVirtual;
  static const int kNumDisplays = 1 + kNumBuiltIn + kNumPluggable + kNumVirtual +
                                    1 + kNumBuiltIn + kNumPluggable;

  HWC2::Error Hotplug(hwc2_display_t display, HWC2::Connection state);
  HWC2::Error Refresh(hwc2_display_t display);
  HWC2::Error Vsync(hwc2_display_t display, int64_t timestamp);
  HWC2::Error Register(HWC2::Callback, hwc2_callback_data_t callback_data,
                       hwc2_function_pointer_t pointer);
  void UpdateVsyncSource(hwc2_display_t from) {
    vsync_source_ = from;
  }
  hwc2_display_t GetVsyncSource() { return vsync_source_; }

  bool VsyncCallbackRegistered() { return (vsync_ != nullptr && vsync_data_ != nullptr); }
  bool NeedsRefresh(hwc2_display_t display) { return pending_refresh_.test(UINT32(display)); }
  void ResetRefresh(hwc2_display_t display) { pending_refresh_.reset(UINT32(display)); }
  bool IsClientConnected() {
    SCOPE_LOCK(callbacks_lock_);
    return client_connected_;
  }

 private:
  hwc2_callback_data_t hotplug_data_ = nullptr;
  hwc2_callback_data_t refresh_data_ = nullptr;
  hwc2_callback_data_t vsync_data_ = nullptr;

  HWC2_PFN_HOTPLUG hotplug_ = nullptr;
  HWC2_PFN_REFRESH refresh_ = nullptr;
  HWC2_PFN_VSYNC vsync_ = nullptr;
  hwc2_display_t vsync_source_ = HWC_DISPLAY_PRIMARY;   // hw vsync is active on this display
  std::bitset<kNumDisplays> pending_refresh_;         // Displays waiting to get refreshed

  Locker callbacks_lock_;
  bool client_connected_ = false;
};

}  // namespace sdm

#endif  // __HWC_CALLBACKS_H__