Function xpdf_distill

lib/matplotlib/backends/backend_ps.py:1332–1371

Use ghostscript's ps2pdf and xpdf's/poppler's pdftops to distill a file. This yields smaller files without illegal encapsulated postscript operators. This distiller is preferred, generating high-level postscript output that treats text as text.

(tmpfile, eps=False, ptype='letter', bbox=None, rotated=False)

def xpdf_distill(tmpfile, eps=False, ptype='letter', bbox=None, rotated=False):
    """
    Use ghostscript's ps2pdf and xpdf's/poppler's pdftops to distill a file.
    This yields smaller files without illegal encapsulated postscript
    operators. This distiller is preferred, generating high-level postscript
    output that treats text as text.
    """
    mpl._get_executable_info("gs")  # Effectively checks for ps2pdf.
    mpl._get_executable_info("pdftops")

    if eps:
        paper_option = ["-dEPSCrop"]
    elif ptype == "figure":
        # The bbox will have its lower-left corner at (0, 0), so upper-right
        # corner corresponds with paper size.
        paper_option = [f"-dDEVICEWIDTHPOINTS#{bbox[2]}",
                        f"-dDEVICEHEIGHTPOINTS#{bbox[3]}"]
    else:
        paper_option = [f"-sPAPERSIZE#{ptype}"]

    with TemporaryDirectory() as tmpdir:
        tmppdf = pathlib.Path(tmpdir, "tmp.pdf")
        tmpps = pathlib.Path(tmpdir, "tmp.ps")
        # Pass options as `-foo#bar` instead of `-foo=bar` to keep Windows
        # happy (https://ghostscript.com/doc/9.56.1/Use.htm#MS_Windows).
        cbook._check_and_log_subprocess(
            ["ps2pdf",
             "-dSAFER",
             "-dAutoFilterColorImages#false",
             "-dAutoFilterGrayImages#false",
             "-sAutoRotatePages#None",
             "-sGrayImageFilter#FlateEncode",
             "-sColorImageFilter#FlateEncode",
             *paper_option,
             tmpfile, tmppdf], _log)
        cbook._check_and_log_subprocess(
            ["pdftops", "-paper", "match", "-level3", tmppdf, tmpps], _log)
        shutil.move(tmpps, tmpfile)
    if eps:
        pstoeps(tmpfile)


def _get_bbox_header(lbrt):