Function LoadEXRFromMemory

third-party/tinyexr/tinyexr.h:6520–6725

}

int LoadEXRFromMemory(float **out_rgba, int *width, int *height,
                      const unsigned char *memory, size_t size,
                      const char **err) {
  if (out_rgba == NULL || memory == NULL) {
    tinyexr::SetErrorMessage("Invalid argument for LoadEXRFromMemory", err);
    return TINYEXR_ERROR_INVALID_ARGUMENT;
  }

  EXRVersion exr_version;
  EXRImage exr_image;
  EXRHeader exr_header;

  InitEXRHeader(&exr_header);

  int ret = ParseEXRVersionFromMemory(&exr_version, memory, size);
  if (ret != TINYEXR_SUCCESS) {
    std::stringstream ss;
    ss << "Failed to parse EXR version. code(" << ret << ")";
    tinyexr::SetErrorMessage(ss.str(), err);
    return ret;
  }

  ret = ParseEXRHeaderFromMemory(&exr_header, &exr_version, memory, size, err);
  if (ret != TINYEXR_SUCCESS) {
    return ret;
  }

  // Read HALF channel as FLOAT.
  for (int i = 0; i < exr_header.num_channels; i++) {
    if (exr_header.pixel_types[i] == TINYEXR_PIXELTYPE_HALF) {
      exr_header.requested_pixel_types[i] = TINYEXR_PIXELTYPE_FLOAT;
    }
  }

  InitEXRImage(&exr_image);
  ret = LoadEXRImageFromMemory(&exr_image, &exr_header, memory, size, err);
  if (ret != TINYEXR_SUCCESS) {
    return ret;
  }

  // RGBA
  int idxR = -1;
  int idxG = -1;
  int idxB = -1;
  int idxA = -1;
  for (int c = 0; c < exr_header.num_channels; c++) {
    if (strcmp(exr_header.channels[c].name, "R") == 0) {
      idxR = c;
    } else if (strcmp(exr_header.channels[c].name, "G") == 0) {
      idxG = c;
    } else if (strcmp(exr_header.channels[c].name, "B") == 0) {
      idxB = c;
    } else if (strcmp(exr_header.channels[c].name, "A") == 0) {
      idxA = c;
    }
  }

  // TODO(syoyo): Refactor removing same code as used in LoadEXR().