Bug in mediabox expansion when applying non-right angle rotation

[MrinalJain17]

• I have a pdf that I want to rotate by an angle that is not a multiple of 90. Let's say 175 degrees.
• In addition, I want to update the mediabox coordinates as needed after the rotation.

Currently, the mediabox expansion is broken.

The bug is caused by these lines of code:

pypdf/pypdf/_page.py

Lines 1658 to 1662 in 9047079

	lowerleft = (min(corners[0], lowerleft[0]), min(corners[1], lowerleft[1]))
	upperright = (
	max(corners[2], upperright[0]),
	max(corners[3], upperright[1]),
	)

Environment

Which environment were you using when you encountered the problem?

$ python -m platform
macOS-14.0-x86_64-i386-64bit

$ python -c "import pypdf;print(pypdf._debug_versions)"
pypdf==3.15.5, crypt_provider=('cryptography', '39.0.1'), PIL=10.0.1

Code + PDF

This is a minimal, complete example that shows the issue:

from pypdf import PdfWriter, PdfReader, Transformation

reader = PdfReader("input.pdf")
writer = PdfWriter()

transformation = Transformation().rotate(175)

for page_box in reader.pages:
    page_box.add_transformation(transformation, expand=True)
    writer.add_page(page_box)

with open("output.pdf", "wb") as f:
    writer.write(f)

• Input pdf: input.pdf
• Current output of the code above: current_output.pdf
  • Notice the white space covering the top-half of each page. This represents an incorrect expansion of the media box.
• Expected output of the code above: expected_output.pdf