mirror of
https://github.com/python-pillow/Pillow.git
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383 lines
10 KiB
Python
383 lines
10 KiB
Python
from __future__ import annotations
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import sys
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from io import BytesIO
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from pathlib import Path
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import pytest
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from PIL import Image, PpmImagePlugin
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from .helper import (
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assert_image_equal,
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assert_image_equal_tofile,
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assert_image_similar,
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hopper,
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)
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# sample ppm stream
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TEST_FILE = "Tests/images/hopper.ppm"
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def test_sanity() -> None:
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with Image.open(TEST_FILE) as im:
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assert im.mode == "RGB"
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assert im.size == (128, 128)
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assert im.format == "PPM"
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assert im.get_format_mimetype() == "image/x-portable-pixmap"
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@pytest.mark.parametrize(
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"data, mode, pixels",
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(
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(b"P2 3 1 4 0 2 4", "L", (0, 128, 255)),
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(b"P2 3 1 257 0 128 257", "I", (0, 32640, 65535)),
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# P3 with maxval < 255
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(
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b"P3 3 1 17 0 1 2 8 9 10 15 16 17",
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"RGB",
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((0, 15, 30), (120, 135, 150), (225, 240, 255)),
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),
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# P3 with maxval > 255
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# Scale down to 255, since there is no RGB mode with more than 8-bit
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(
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b"P3 3 1 257 0 1 2 128 129 130 256 257 257",
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"RGB",
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((0, 1, 2), (127, 128, 129), (254, 255, 255)),
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),
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(b"P5 3 1 4 \x00\x02\x04", "L", (0, 128, 255)),
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(b"P5 3 1 257 \x00\x00\x00\x80\x01\x01", "I", (0, 32640, 65535)),
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# P6 with maxval < 255
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(
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b"P6 3 1 17 \x00\x01\x02\x08\x09\x0a\x0f\x10\x11",
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"RGB",
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(
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(0, 15, 30),
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(120, 135, 150),
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(225, 240, 255),
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),
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),
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# P6 with maxval > 255
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(
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b"P6 3 1 257 \x00\x00\x00\x01\x00\x02"
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b"\x00\x80\x00\x81\x00\x82\x01\x00\x01\x01\xff\xff",
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"RGB",
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(
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(0, 1, 2),
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(127, 128, 129),
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(254, 255, 255),
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),
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),
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),
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)
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def test_arbitrary_maxval(
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data: bytes, mode: str, pixels: tuple[int | tuple[int, int, int], ...]
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) -> None:
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fp = BytesIO(data)
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with Image.open(fp) as im:
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assert im.size == (3, 1)
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assert im.mode == mode
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px = im.load()
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assert px is not None
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assert tuple(px[x, 0] for x in range(3)) == pixels
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def test_16bit_pgm() -> None:
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with Image.open("Tests/images/16_bit_binary.pgm") as im:
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assert im.mode == "I"
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assert im.size == (20, 100)
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assert im.get_format_mimetype() == "image/x-portable-graymap"
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assert_image_equal_tofile(im, "Tests/images/16_bit_binary_pgm.tiff")
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def test_16bit_pgm_write(tmp_path: Path) -> None:
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with Image.open("Tests/images/16_bit_binary.pgm") as im:
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filename = tmp_path / "temp.pgm"
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im.save(filename, "PPM")
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assert_image_equal_tofile(im, filename)
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im.convert("I;16").save(filename, "PPM")
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assert_image_equal_tofile(im, filename)
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def test_pnm(tmp_path: Path) -> None:
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with Image.open("Tests/images/hopper.pnm") as im:
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assert_image_similar(im, hopper(), 0.0001)
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filename = tmp_path / "temp.pnm"
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im.save(filename)
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assert_image_equal_tofile(im, filename)
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def test_pfm(tmp_path: Path) -> None:
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with Image.open("Tests/images/hopper.pfm") as im:
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assert im.info["scale"] == 1.0
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assert_image_equal(im, hopper("F"))
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filename = tmp_path / "tmp.pfm"
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im.save(filename)
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assert_image_equal_tofile(im, filename)
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def test_pfm_big_endian(tmp_path: Path) -> None:
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with Image.open("Tests/images/hopper_be.pfm") as im:
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assert im.info["scale"] == 2.5
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assert_image_equal(im, hopper("F"))
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filename = tmp_path / "tmp.pfm"
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im.save(filename)
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assert_image_equal_tofile(im, filename)
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@pytest.mark.parametrize(
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"data",
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[
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b"Pf 1 1 NaN \0\0\0\0",
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b"Pf 1 1 inf \0\0\0\0",
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b"Pf 1 1 -inf \0\0\0\0",
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b"Pf 1 1 0.0 \0\0\0\0",
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b"Pf 1 1 -0.0 \0\0\0\0",
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],
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)
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def test_pfm_invalid(data: bytes) -> None:
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with pytest.raises(ValueError):
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with Image.open(BytesIO(data)):
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pass
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@pytest.mark.parametrize(
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"plain_path, raw_path",
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(
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(
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"Tests/images/hopper_1bit_plain.pbm", # P1
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"Tests/images/hopper_1bit.pbm", # P4
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),
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(
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"Tests/images/hopper_8bit_plain.pgm", # P2
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"Tests/images/hopper_8bit.pgm", # P5
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),
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(
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"Tests/images/hopper_8bit_plain.ppm", # P3
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"Tests/images/hopper_8bit.ppm", # P6
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),
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),
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)
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def test_plain(plain_path: str, raw_path: str) -> None:
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with Image.open(plain_path) as im:
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assert_image_equal_tofile(im, raw_path)
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def test_16bit_plain_pgm() -> None:
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# P2 with maxval 2 ** 16 - 1
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with Image.open("Tests/images/hopper_16bit_plain.pgm") as im:
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assert im.mode == "I"
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assert im.size == (128, 128)
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assert im.get_format_mimetype() == "image/x-portable-graymap"
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# P5 with maxval 2 ** 16 - 1
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assert_image_equal_tofile(im, "Tests/images/hopper_16bit.pgm")
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@pytest.mark.parametrize(
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"header, data, comment_count",
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(
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(b"P1\n2 2", b"1010", 10**6),
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(b"P2\n3 1\n4", b"0 2 4", 1),
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(b"P3\n2 2\n255", b"0 0 0 001 1 1 2 2 2 255 255 255", 10**6),
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),
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)
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def test_plain_data_with_comment(
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tmp_path: Path, header: bytes, data: bytes, comment_count: int
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) -> None:
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path1 = tmp_path / "temp1.ppm"
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path2 = tmp_path / "temp2.ppm"
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comment = b"# comment" * comment_count
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with open(path1, "wb") as f1, open(path2, "wb") as f2:
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f1.write(header + b"\n\n" + data)
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f2.write(header + b"\n" + comment + b"\n" + data + comment)
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with Image.open(path1) as im:
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assert_image_equal_tofile(im, path2)
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@pytest.mark.parametrize("data", (b"P1\n128 128\n", b"P3\n128 128\n255\n"))
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def test_plain_truncated_data(tmp_path: Path, data: bytes) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(data)
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with Image.open(path) as im:
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with pytest.raises(ValueError):
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im.load()
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@pytest.mark.parametrize("data", (b"P1\n128 128\n1009", b"P3\n128 128\n255\n100A"))
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def test_plain_invalid_data(tmp_path: Path, data: bytes) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(data)
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with Image.open(path) as im:
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with pytest.raises(ValueError):
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im.load()
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@pytest.mark.parametrize(
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"data",
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(
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b"P3\n128 128\n255\n012345678910", # half token too long
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b"P3\n128 128\n255\n012345678910 0", # token too long
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),
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)
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def test_plain_ppm_token_too_long(tmp_path: Path, data: bytes) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(data)
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with Image.open(path) as im:
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with pytest.raises(ValueError):
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im.load()
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def test_plain_ppm_value_negative(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P3\n128 128\n255\n-1")
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with Image.open(path) as im:
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with pytest.raises(ValueError, match="Channel value is negative"):
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im.load()
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def test_plain_ppm_value_too_large(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P3\n128 128\n255\n256")
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with Image.open(path) as im:
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with pytest.raises(ValueError, match="Channel value too large"):
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im.load()
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def test_magic() -> None:
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with pytest.raises(SyntaxError):
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PpmImagePlugin.PpmImageFile(fp=BytesIO(b"PyInvalid"))
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def test_header_with_comments(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P6 #comment\n#comment\r12#comment\r8\n128 #comment\n255\n")
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with Image.open(path) as im:
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assert im.size == (128, 128)
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def test_non_integer_token(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P6\nTEST")
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with pytest.raises(ValueError):
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with Image.open(path):
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pass
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def test_header_token_too_long(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P6\n 01234567890")
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with pytest.raises(ValueError, match="Token too long in file header: 01234567890"):
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with Image.open(path):
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pass
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def test_truncated_file(tmp_path: Path) -> None:
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# Test EOF in header
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path = tmp_path / "temp.pgm"
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with open(path, "wb") as f:
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f.write(b"P6")
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with pytest.raises(ValueError, match="Reached EOF while reading header"):
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with Image.open(path):
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pass
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# Test EOF for PyDecoder
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fp = BytesIO(b"P5 3 1 4")
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with Image.open(fp) as im:
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with pytest.raises(ValueError):
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im.load()
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def test_not_enough_image_data(tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P2 1 2 255 255")
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with Image.open(path) as im:
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with pytest.raises(ValueError):
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im.load()
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@pytest.mark.parametrize("maxval", (b"0", b"65536"))
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def test_invalid_maxval(maxval: bytes, tmp_path: Path) -> None:
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path = tmp_path / "temp.ppm"
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with open(path, "wb") as f:
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f.write(b"P6\n3 1 " + maxval)
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with pytest.raises(
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ValueError, match="maxval must be greater than 0 and less than 65536"
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):
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with Image.open(path):
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pass
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def test_neg_ppm() -> None:
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# Storage.c accepted negative values for xsize, ysize. the
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# internal open_ppm function didn't check for sanity but it
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# has been removed. The default opener doesn't accept negative
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# sizes.
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with pytest.raises(OSError):
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with Image.open("Tests/images/negative_size.ppm"):
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pass
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def test_mimetypes(tmp_path: Path) -> None:
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path = tmp_path / "temp.pgm"
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with open(path, "wb") as f:
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f.write(b"P4\n128 128\n255")
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with Image.open(path) as im:
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assert im.get_format_mimetype() == "image/x-portable-bitmap"
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with open(path, "wb") as f:
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f.write(b"PyCMYK\n128 128\n255")
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with Image.open(path) as im:
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assert im.get_format_mimetype() == "image/x-portable-anymap"
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@pytest.mark.parametrize("buffer", (True, False))
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def test_save_stdout(buffer: bool, monkeypatch: pytest.MonkeyPatch) -> None:
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class MyStdOut:
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buffer = BytesIO()
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mystdout: MyStdOut | BytesIO = MyStdOut() if buffer else BytesIO()
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monkeypatch.setattr(sys, "stdout", mystdout)
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with Image.open(TEST_FILE) as im:
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im.save(sys.stdout, "PPM")
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if isinstance(mystdout, MyStdOut):
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mystdout = mystdout.buffer
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with Image.open(mystdout) as reloaded:
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assert_image_equal_tofile(reloaded, TEST_FILE)
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