Function BmpWrite

linux/src/main.cpp:56–90

}

void BmpWrite(unsigned char* image, int imageWidth, int imageHeight, const char* filename) {
  unsigned char header[54] = {0x42, 0x4d, 0, 0, 0, 0, 0, 0, 0, 0, 54, 0, 0, 0, 40, 0, 0, 0,
                              0,    0,    0, 0, 0, 0, 0, 0, 1, 0, 32, 0, 0, 0, 0,  0, 0, 0,
                              0,    0,    0, 0, 0, 0, 0, 0, 0, 0, 0,  0, 0, 0, 0,  0, 0, 0};

  int64_t file_size = static_cast<int64_t>(imageWidth) * static_cast<int64_t>(imageHeight) * 4 + 54;
  header[2] = static_cast<unsigned char>(file_size & 0x000000ff);
  header[3] = (file_size >> 8) & 0x000000ff;
  header[4] = (file_size >> 16) & 0x000000ff;
  header[5] = (file_size >> 24) & 0x000000ff;

  int64_t width = imageWidth;
  header[18] = width & 0x000000ff;
  header[19] = (width >> 8) & 0x000000ff;
  header[20] = (width >> 16) & 0x000000ff;
  header[21] = (width >> 24) & 0x000000ff;

  int64_t height = -imageHeight;
  header[22] = height & 0x000000ff;
  header[23] = (height >> 8) & 0x000000ff;
  header[24] = (height >> 16) & 0x000000ff;
  header[25] = (height >> 24) & 0x000000ff;

  char fname_bmp[128];
  snprintf(fname_bmp, 128, "%s.bmp", filename);

  FILE* fp;
  if (!(fp = fopen(fname_bmp, "wb"))) {
    return;
  }

  fwrite(header, sizeof(unsigned char), 54, fp);
  fwrite(image, sizeof(unsigned char), (size_t)(int64_t)imageWidth * imageHeight * 4, fp);
  fclose(fp);
}

int main() {
  auto startTime = GetTimer();