docs: def render_latex(input_text, dpath=None, fname=None, preamb_extra=None,
                   verbose=1, **kwargs):
      """
      Renders latex text into a jpeg.
  
      Whitespace that would have appeared in the PDF is removed, so the jpeg is
      cropped only the the relevant part.  This is ideal for figures that only
      take a single page.
  
      Args:
          input_text (?):
          dpath (str):  directory path(default = None)
          fname (str):  file name(default = None)
          preamb_extra (None): (default = None)
          verbose (int):  verbosity flag(default = 1)
  
      Returns:
          str: jpg_fpath -  file path string
  
      CommandLine:
          python -m utool.util_latex render_latex '$O(n^2)$' --fpath=~/slides/tmp.jpg
  
      Script:
          >>> # SCRIPT
          >>> from utool.util_latex import *  # NOQA
          >>> from os.path import split, expanduser
          >>> import utool as ut
          >>> input_text = ' '.join(ut.get_varargs()[1:])
          >>> dpath, fname = split(ut.argval('--fpath', ''))
          >>> dpath = expanduser(ut.argval('--dpath', dpath))
          >>> fname = ut.argval('--fname', fname)
          >>> kwargs = ut.dict_subset(ut.argparse_funckw(ut.convert_pdf_to_image), ['dpi', 'quality'])
          >>> jpg_fpath = render_latex(input_text, dpath, fname, **kwargs)
          >>> if ut.argflag('--diskshow'):
          >>>     ut.startfile(jpg_fpath)
      """
      import utool as ut
      import vtool as vt
      # turn off page numbers
      input_text_ = '\pagenumbering{gobble}\n' + input_text
      # fname, _ = splitext(fname)
      img_fname = ut.ensure_ext(fname, ['.jpg'] + list(ut.IMG_EXTENSIONS))
      img_fpath = join(dpath, img_fname)
      pdf_fpath = ut.compile_latex_text(
          input_text_, fname=fname, dpath=dpath, preamb_extra=preamb_extra,
          verbose=verbose, move=False)
      ext = splitext(img_fname)[1]
      fpath_in = ut.convert_pdf_to_image(pdf_fpath, ext=ext, verbose=verbose)
      # Clip of boundaries of the pdf imag
      vt.clipwhite_ondisk(fpath_in, fpath_out=img_fpath, verbose=verbose > 1)
      return img_fpath