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apply_redactions() drops the line width set before a Form XObject (regression in 2.0) #5254
Description
Description of the bug
Similar to #5228, but for form XObjects instead of stroked text. When a page sets the line width and then draws a form XObject that strokes with it, apply_redactions() removes the w before the Do, and the form is drawn with the default 1 pt line. 1.28.2 keeps it. J, j and d are dropped the same way, and clean_contents(sanitize=True) gives the same result.
matplotlib draws scatter markers like this, so redacting one axis label in a plot makes every marker thicker.
The fix for #5228 (MuPDF e38993a) doesn't seem to cover this case: pdf_filter_Do_form() still flushes with FLUSH_ALL, which doesn't include FLUSH_STROKE_STATE.
How to reproduce the bug
import pymupdf
print("PyMuPDF", pymupdf.__version__, "MuPDF", pymupdf.mupdf_version)
doc = pymupdf.open()
page = doc.new_page(width=300, height=200)
page.insert_text((0, 0), " ", fontname="helv") # just to get a Helvetica resource
font = page.get_fonts()[0][4]
# A form XObject that strokes a line but does not set the line width itself,
# like the scatter markers matplotlib writes.
form = doc.get_new_xref()
doc.update_object(form, "<< /Type /XObject /Subtype /Form /BBox [-1 -1 11 11] >>")
doc.update_stream(form, b"0 0 m 10 10 l S")
res = int(doc.xref_get_key(page.xref, "Resources")[1].split()[0])
doc.xref_set_key(res, "XObject", f"<< /P0 {form} 0 R >>")
doc.update_stream(
page.get_contents()[0],
f"0.6 w q 1 0 0 1 50 50 cm /P0 Do Q BT /{font} 12 Tf 50 150 Td (Hello) Tj ET".encode(),
)
print("before:", page.read_contents())
print("line width before:", page.get_drawings()[0]["width"])
page.add_redact_annot(page.search_for("Hello")[0])
page.apply_redactions()
print("after: ", page.read_contents())
print("line width after: ", page.get_drawings()[0]["width"])Output with PyMuPDF 2.1:
PyMuPDF 2.1 MuPDF 1.28.6
before: b'0.6 w q 1 0 0 1 50 50 cm /P0 Do Q BT /helv 12 Tf 50 150 Td (Hello) Tj ET'
line width before: 0.6000000238418579
after: b'q q 1 0 0 1 50 50 cm /Fm1 Do Q Q'
line width after: 1.0
Output with PyMuPDF 1.28.2:
PyMuPDF 1.28.2 MuPDF 1.28.2
before: b'0.6 w q 1 0 0 1 50 50 cm /P0 Do Q BT /helv 12 Tf 50 150 Td (Hello) Tj ET'
line width before: 0.6000000238418579
after: b'q q 1 0 0 1 50 50 cm .6 w /Fm1 Do Q Q'
line width after: 0.6000000238418579
PyMuPDF version
2.1
Operating system
Linux
Python version
3.13
Activity
JorjMcKie commentedon Nov 5, 2026
test_5254-before.pdf
test_5254-after.pdf
New MuPDF issue: https://bugs.ghostscript.com/show_bug.cgi?id=709959