libs/vr/libdvr/dvr_api.cpp

#include "include/dvr/dvr_api.h"

#include <errno.h>
#include <utils/Log.h>

#include <algorithm>

// Headers from libdvr
#include <dvr/dvr_buffer.h>
#include <dvr/dvr_buffer_queue.h>
#include <dvr/dvr_configuration_data.h>
#include <dvr/dvr_display_manager.h>
#include <dvr/dvr_surface.h>
#include <dvr/dvr_vsync.h>

// Headers not yet moved into libdvr.
// TODO(jwcai) Move these once their callers are moved into Google3.
#include <dvr/dvr_hardware_composer_client.h>
#include <dvr/pose_client.h>
#include <dvr/virtual_touchpad_client.h>

extern "C" {

int dvrGetApi(void* api, size_t struct_size, int version) {
  ALOGI("dvrGetApi: api=%p struct_size=%zu version=%d", api, struct_size,
        version);
  if (version == 1) {
    // New entry points are added at the end. If the caller's struct and
    // this library have different sizes, we define the entry points in common.
    // The caller is expected to handle unset entry points if necessary.
    size_t clamped_struct_size = std::min(struct_size, sizeof(DvrApi_v1));
    DvrApi_v1* dvr_api = static_cast<DvrApi_v1*>(api);

// Defines an API entry for V1 (no version suffix).
#define DVR_V1_API_ENTRY(name)                                 \
  do {                                                         \
    if ((offsetof(DvrApi_v1, name) + sizeof(dvr_api->name)) <= \
        clamped_struct_size) {                                 \
      dvr_api->name = dvr##name;                               \
    }                                                          \
  } while (0)

#include "include/dvr/dvr_api_entries.h"

// Undefine macro definitions to play nice with Google3 style rules.
#undef DVR_V1_API_ENTRY

    return 0;
  }

  ALOGE("dvrGetApi: Unknown API version=%d", version);
  return -EINVAL;
}

}  // extern "C"