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113 lines
2.7 KiB
Python
113 lines
2.7 KiB
Python
import sys
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from io import BytesIO
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import pytest
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from PIL import Image
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from .helper import assert_image_equal_tofile, assert_image_similar, hopper
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# sample ppm stream
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TEST_FILE = "Tests/images/hopper.ppm"
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def test_sanity():
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with Image.open(TEST_FILE) as im:
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im.load()
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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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def test_16bit_pgm():
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with Image.open("Tests/images/16_bit_binary.pgm") as im:
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im.load()
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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.png")
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def test_16bit_pgm_write(tmp_path):
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with Image.open("Tests/images/16_bit_binary.pgm") as im:
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im.load()
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f = str(tmp_path / "temp.pgm")
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im.save(f, "PPM")
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assert_image_equal_tofile(im, f)
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def test_pnm(tmp_path):
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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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f = str(tmp_path / "temp.pnm")
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im.save(f)
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assert_image_equal_tofile(im, f)
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def test_truncated_file(tmp_path):
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path = str(tmp_path / "temp.pgm")
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with open(path, "w") as f:
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f.write("P6")
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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_neg_ppm():
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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):
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path = str(tmp_path / "temp.pgm")
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with open(path, "w") as f:
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f.write("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, "w") as f:
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f.write("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):
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old_stdout = sys.stdout
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if buffer:
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class MyStdOut:
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buffer = BytesIO()
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mystdout = MyStdOut()
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else:
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mystdout = BytesIO()
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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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# Reset stdout
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sys.stdout = old_stdout
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if buffer:
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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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