int Capture(int fLeft, int fTop, int fWidth, int fHeight, void *res) {
  CURSORINFO cursor = { sizeof(cursor) };
  GetCursorInfo(&cursor);
  
  if (fLeft <= -0xffffff) {
    fLeft = cursor.ptScreenPos.x - fWidth / 2;
  }
  if (fTop <= -0xffffff) {
    fTop = cursor.ptScreenPos.y - fHeight / 2;
  }
  
  HWND hDesktopWnd = GetDesktopWindow();
  HDC hDesktopDC = GetDC(hDesktopWnd);
  HDC hCaptureDC = CreateCompatibleDC(hDesktopDC);
  HBITMAP hCaptureBitmap = CreateCompatibleBitmap(hDesktopDC, fWidth, fHeight);
  if (!hDesktopWnd) logError(__LINE__);
  if (!hDesktopDC) logError(__LINE__);
  if (!hCaptureDC) logError(__LINE__);
  if (!hCaptureBitmap) logError(__LINE__);
  if (!SelectObject(hCaptureDC, hCaptureBitmap)) {
    logError(__LINE__);
  }
  
  if (!BitBlt(hCaptureDC, 0, 0, fWidth, fHeight, hDesktopDC, fLeft, fTop, SRCCOPY | CAPTUREBLT)) {
    logError(__LINE__);
  }
  
  BITMAPINFO bmi = {0};
  bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);
  bmi.bmiHeader.biWidth = fWidth;
  bmi.bmiHeader.biHeight = -fHeight;
  bmi.bmiHeader.biPlanes = 1;
  bmi.bmiHeader.biBitCount = 32;
  bmi.bmiHeader.biCompression = BI_RGB;
  
  // RGBQUAD pPixels[fWidth * fHeight];
  
  int linesCopied = -1;
  linesCopied = GetDIBits(hCaptureDC, hCaptureBitmap, 0, fHeight, res, &bmi, DIB_RGB_COLORS);
  if (!linesCopied) {
    logError(__LINE__);
  }
  
  ReleaseDC(hDesktopWnd, hDesktopDC);
  DeleteDC(hCaptureDC);
  DeleteObject(hCaptureBitmap);
  
  return 0; // TODO: return error code here
}

linesCopied = GetDIBits(hCaptureDC, hCaptureBitmap, 0, fHeight, res, &bmi, DIB_RGB_COLORS);