Pillow/Tests/test_file_tiff.py

import logging
from io import BytesIO
import struct
import sys

from helper import unittest, PillowTestCase, hopper

from PIL import Image, TiffImagePlugin
from PIL._util import py3
from PIL.TiffImagePlugin import X_RESOLUTION, Y_RESOLUTION, RESOLUTION_UNIT

logger = logging.getLogger(__name__)


class TestFileTiff(PillowTestCase):

    def test_sanity(self):

        filename = self.tempfile("temp.tif")

        hopper("RGB").save(filename)

        im = Image.open(filename)
        im.load()
        self.assertEqual(im.mode, "RGB")
        self.assertEqual(im.size, (128, 128))
        self.assertEqual(im.format, "TIFF")

        hopper("1").save(filename)
        im = Image.open(filename)

        hopper("L").save(filename)
        im = Image.open(filename)

        hopper("P").save(filename)
        im = Image.open(filename)

        hopper("RGB").save(filename)
        im = Image.open(filename)

        hopper("I").save(filename)
        im = Image.open(filename)

    def test_mac_tiff(self):
        # Read RGBa images from macOS [@PIL136]

        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)

        self.assertEqual(im.mode, "RGBA")
        self.assertEqual(im.size, (55, 43))
        self.assertEqual(im.tile, [('raw', (0, 0, 55, 43), 8, ('RGBa', 0, 1))])
        im.load()

        self.assert_image_similar_tofile(im, "Tests/images/pil136.png", 1)

    def test_wrong_bits_per_sample(self):
        im = Image.open("Tests/images/tiff_wrong_bits_per_sample.tiff")

        self.assertEqual(im.mode, "RGBA")
        self.assertEqual(im.size, (52, 53))
        self.assertEqual(im.tile, [('raw', (0, 0, 52, 53), 160, ('RGBA', 0, 1))])
        im.load()

    def test_set_legacy_api(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        with self.assertRaises(Exception) as e:
            ifd.legacy_api = None
        self.assertEqual(str(e.exception),
                         "Not allowing setting of legacy api")

    def test_xyres_tiff(self):
        filename = "Tests/images/pil168.tif"
        im = Image.open(filename)

        # legacy api
        self.assertIsInstance(im.tag[X_RESOLUTION][0], tuple)
        self.assertIsInstance(im.tag[Y_RESOLUTION][0], tuple)

        # v2 api
        self.assertIsInstance(im.tag_v2[X_RESOLUTION],
                              TiffImagePlugin.IFDRational)
        self.assertIsInstance(im.tag_v2[Y_RESOLUTION],
                              TiffImagePlugin.IFDRational)

        self.assertEqual(im.info['dpi'], (72., 72.))

    def test_xyres_fallback_tiff(self):
        filename = "Tests/images/compression.tif"
        im = Image.open(filename)

        # v2 api
        self.assertIsInstance(im.tag_v2[X_RESOLUTION],
                              TiffImagePlugin.IFDRational)
        self.assertIsInstance(im.tag_v2[Y_RESOLUTION],
                              TiffImagePlugin.IFDRational)
        self.assertRaises(KeyError,
                          lambda: im.tag_v2[RESOLUTION_UNIT])

        # Legacy.
        self.assertEqual(im.info['resolution'], (100., 100.))
        # Fallback "inch".
        self.assertEqual(im.info['dpi'], (100., 100.))

    def test_int_resolution(self):
        filename = "Tests/images/pil168.tif"
        im = Image.open(filename)

        # Try to read a file where X,Y_RESOLUTION are ints
        im.tag_v2[X_RESOLUTION] = 71
        im.tag_v2[Y_RESOLUTION] = 71
        im._setup()
        self.assertEqual(im.info['dpi'], (71., 71.))

    def test_save_setting_missing_resolution(self):
        b = BytesIO()
        Image.open("Tests/images/10ct_32bit_128.tiff").save(
            b, format="tiff", resolution=123.45)
        im = Image.open(b)
        self.assertEqual(float(im.tag_v2[X_RESOLUTION]), 123.45)
        self.assertEqual(float(im.tag_v2[Y_RESOLUTION]), 123.45)

    def test_invalid_file(self):
        invalid_file = "Tests/images/flower.jpg"

        self.assertRaises(SyntaxError,
                          TiffImagePlugin.TiffImageFile, invalid_file)

        TiffImagePlugin.PREFIXES.append(b"\xff\xd8\xff\xe0")
        self.assertRaises(SyntaxError,
                          TiffImagePlugin.TiffImageFile, invalid_file)
        TiffImagePlugin.PREFIXES.pop()

    def test_bad_exif(self):
        i = Image.open('Tests/images/hopper_bad_exif.jpg')
        try:
            self.assert_warning(UserWarning, i._getexif)
        except struct.error:
            self.fail(
                "Bad EXIF data passed incorrect values to _binary unpack")

    def test_save_rgba(self):
        im = hopper("RGBA")
        outfile = self.tempfile("temp.tif")
        im.save(outfile)

    def test_save_unsupported_mode(self):
        im = hopper("HSV")
        outfile = self.tempfile("temp.tif")
        self.assertRaises(IOError, im.save, outfile)

    def test_little_endian(self):
        im = Image.open('Tests/images/16bit.cropped.tif')
        self.assertEqual(im.getpixel((0, 0)), 480)
        self.assertEqual(im.mode, 'I;16')

        b = im.tobytes()
        # Bytes are in image native order (little endian)
        if py3:
            self.assertEqual(b[0], ord(b'\xe0'))
            self.assertEqual(b[1], ord(b'\x01'))
        else:
            self.assertEqual(b[0], b'\xe0')
            self.assertEqual(b[1], b'\x01')

    def test_big_endian(self):
        im = Image.open('Tests/images/16bit.MM.cropped.tif')
        self.assertEqual(im.getpixel((0, 0)), 480)
        self.assertEqual(im.mode, 'I;16B')

        b = im.tobytes()

        # Bytes are in image native order (big endian)
        if py3:
            self.assertEqual(b[0], ord(b'\x01'))
            self.assertEqual(b[1], ord(b'\xe0'))
        else:
            self.assertEqual(b[0], b'\x01')
            self.assertEqual(b[1], b'\xe0')

    def test_16bit_s(self):
        im = Image.open('Tests/images/16bit.s.tif')
        im.load()
        self.assertEqual(im.mode, 'I')
        self.assertEqual(im.getpixel((0, 0)), 32767)
        self.assertEqual(im.getpixel((0, 1)), 0)

    def test_12bit_rawmode(self):
        """ Are we generating the same interpretation
        of the image as Imagemagick is? """

        im = Image.open('Tests/images/12bit.cropped.tif')

        # to make the target --
        # convert 12bit.cropped.tif -depth 16 tmp.tif
        # convert tmp.tif -evaluate RightShift 4 12in16bit2.tif
        # imagemagick will auto scale so that a 12bit FFF is 16bit FFF0,
        # so we need to unshift so that the integer values are the same.

        self.assert_image_equal_tofile(im, 'Tests/images/12in16bit.tif')

    def test_32bit_float(self):
        # Issue 614, specific 32-bit float format
        path = 'Tests/images/10ct_32bit_128.tiff'
        im = Image.open(path)
        im.load()

        self.assertEqual(im.getpixel((0, 0)), -0.4526388943195343)
        self.assertEqual(
            im.getextrema(), (-3.140936851501465, 3.140684127807617))

    def test_n_frames(self):
        for path, n_frames in [
            ['Tests/images/multipage-lastframe.tif', 1],
            ['Tests/images/multipage.tiff', 3]
        ]:
            # Test is_animated before n_frames
            im = Image.open(path)
            self.assertEqual(im.is_animated, n_frames != 1)

            # Test is_animated after n_frames
            im = Image.open(path)
            self.assertEqual(im.n_frames, n_frames)
            self.assertEqual(im.is_animated, n_frames != 1)

    def test_eoferror(self):
        im = Image.open('Tests/images/multipage-lastframe.tif')
        n_frames = im.n_frames

        # Test seeking past the last frame
        self.assertRaises(EOFError, im.seek, n_frames)
        self.assertLess(im.tell(), n_frames)

        # Test that seeking to the last frame does not raise an error
        im.seek(n_frames-1)

    def test_multipage(self):
        # issue #862
        im = Image.open('Tests/images/multipage.tiff')
        # file is a multipage tiff: 10x10 green, 10x10 red, 20x20 blue

        im.seek(0)
        self.assertEqual(im.size, (10, 10))
        self.assertEqual(im.convert('RGB').getpixel((0, 0)), (0, 128, 0))

        im.seek(1)
        im.load()
        self.assertEqual(im.size, (10, 10))
        self.assertEqual(im.convert('RGB').getpixel((0, 0)), (255, 0, 0))

        im.seek(2)
        im.load()
        self.assertEqual(im.size, (20, 20))
        self.assertEqual(im.convert('RGB').getpixel((0, 0)), (0, 0, 255))

    def test_multipage_last_frame(self):
        im = Image.open('Tests/images/multipage-lastframe.tif')
        im.load()
        self.assertEqual(im.size, (20, 20))
        self.assertEqual(im.convert('RGB').getpixel((0, 0)), (0, 0, 255))

    def test___str__(self):
        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)

        # Act
        ret = str(im.ifd)

        # Assert
        self.assertIsInstance(ret, str)

    def test_dict(self):
        # Arrange
        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)

        # v2 interface
        v2_tags = {256: 55, 257: 43, 258: (8, 8, 8, 8), 259: 1,
                   262: 2, 296: 2, 273: (8,), 338: (1,), 277: 4,
                   279: (9460,), 282: 72.0, 283: 72.0, 284: 1}
        self.assertEqual(dict(im.tag_v2), v2_tags)

        # legacy interface
        legacy_tags = {256: (55,), 257: (43,), 258: (8, 8, 8, 8), 259: (1,),
                       262: (2,), 296: (2,), 273: (8,), 338: (1,), 277: (4,),
                       279: (9460,), 282: ((720000, 10000),),
                       283: ((720000, 10000),), 284: (1,)}
        self.assertEqual(dict(im.tag), legacy_tags)

    def test__delitem__(self):
        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)
        len_before = len(dict(im.ifd))
        del im.ifd[256]
        len_after = len(dict(im.ifd))
        self.assertEqual(len_before, len_after + 1)

    def test_load_byte(self):
        for legacy_api in [False, True]:
            ifd = TiffImagePlugin.ImageFileDirectory_v2()
            data = b"abc"
            ret = ifd.load_byte(data, legacy_api)
            self.assertEqual(ret, b"abc")

    def test_load_string(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abc\0"
        ret = ifd.load_string(data, False)
        self.assertEqual(ret, "abc")

    def test_load_float(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abcdabcd"
        ret = ifd.load_float(data, False)
        self.assertEqual(ret, (1.6777999408082104e+22, 1.6777999408082104e+22))

    def test_load_double(self):
        ifd = TiffImagePlugin.ImageFileDirectory_v2()
        data = b"abcdefghabcdefgh"
        ret = ifd.load_double(data, False)
        self.assertEqual(ret, (8.540883223036124e+194, 8.540883223036124e+194))

    def test_seek(self):
        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)
        im.seek(0)
        self.assertEqual(im.tell(), 0)

    def test_seek_eof(self):
        filename = "Tests/images/pil136.tiff"
        im = Image.open(filename)
        self.assertEqual(im.tell(), 0)
        self.assertRaises(EOFError, im.seek, -1)
        self.assertRaises(EOFError, im.seek, 1)

    def test__limit_rational_int(self):
        from PIL.TiffImagePlugin import _limit_rational
        value = 34
        ret = _limit_rational(value, 65536)
        self.assertEqual(ret, (34, 1))

    def test__limit_rational_float(self):
        from PIL.TiffImagePlugin import _limit_rational
        value = 22.3
        ret = _limit_rational(value, 65536)
        self.assertEqual(ret, (223, 10))

    def test_4bit(self):
        test_file = "Tests/images/hopper_gray_4bpp.tif"
        original = hopper("L")
        im = Image.open(test_file)
        self.assertEqual(im.size, (128, 128))
        self.assertEqual(im.mode, "L")
        self.assert_image_similar(im, original, 7.3)

    def test_gray_semibyte_per_pixel(self):
        test_files = (
            (
                24.8,  # epsilon
                (  # group
                    "Tests/images/tiff_gray_2_4_bpp/hopper2.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2I.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2R.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper2IR.tif",
                )
            ),
            (
                7.3,  # epsilon
                (  # group
                    "Tests/images/tiff_gray_2_4_bpp/hopper4.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4I.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4R.tif",
                    "Tests/images/tiff_gray_2_4_bpp/hopper4IR.tif",
                )
            ),
        )
        original = hopper("L")
        for epsilon, group in test_files:
            im = Image.open(group[0])
            self.assertEqual(im.size, (128, 128))
            self.assertEqual(im.mode, "L")
            self.assert_image_similar(im, original, epsilon)
            for file in group[1:]:
                im2 = Image.open(file)
                self.assertEqual(im2.size, (128, 128))
                self.assertEqual(im2.mode, "L")
                self.assert_image_equal(im, im2)

    def test_with_underscores(self):
        kwargs = {'resolution_unit': 'inch',
                  'x_resolution': 72,
                  'y_resolution': 36}
        filename = self.tempfile("temp.tif")
        hopper("RGB").save(filename, **kwargs)
        im = Image.open(filename)

        # legacy interface
        self.assertEqual(im.tag[X_RESOLUTION][0][0], 72)
        self.assertEqual(im.tag[Y_RESOLUTION][0][0], 36)

        # v2 interface
        self.assertEqual(im.tag_v2[X_RESOLUTION], 72)
        self.assertEqual(im.tag_v2[Y_RESOLUTION], 36)

    def test_roundtrip_tiff_uint16(self):
        # Test an image of all '0' values
        pixel_value = 0x1234
        infile = "Tests/images/uint16_1_4660.tif"
        im = Image.open(infile)
        self.assertEqual(im.getpixel((0, 0)), pixel_value)

        tmpfile = self.tempfile("temp.tif")
        im.save(tmpfile)

        reloaded = Image.open(tmpfile)

        self.assert_image_equal(im, reloaded)

    def test_tiff_save_all(self):
        import io
        import os

        mp = io.BytesIO()
        with Image.open("Tests/images/multipage.tiff") as im:
            im.save(mp, format="tiff", save_all=True)

        mp.seek(0, os.SEEK_SET)
        with Image.open(mp) as im:
            self.assertEqual(im.n_frames, 3)

        # Test appending images
        mp = io.BytesIO()
        im = Image.new('RGB', (100, 100), '#f00')
        ims = [Image.new('RGB', (100, 100), color) for color
               in ['#0f0', '#00f']]
        im.copy().save(mp, format="TIFF", save_all=True, append_images=ims)

        mp.seek(0, os.SEEK_SET)
        reread = Image.open(mp)
        self.assertEqual(reread.n_frames, 3)

        # Test appending using a generator
        def imGenerator(ims):
            for im in ims:
                yield im
        mp = io.BytesIO()
        im.save(mp, format="TIFF", save_all=True, append_images=imGenerator(ims))

        mp.seek(0, os.SEEK_SET)
        reread = Image.open(mp)
        self.assertEqual(reread.n_frames, 3)

    def test_saving_icc_profile(self):
        # Tests saving TIFF with icc_profile set.
        # At the time of writing this will only work for non-compressed tiffs
        # as libtiff does not support embedded ICC profiles,
        # ImageFile._save(..) however does.
        im = Image.new('RGB', (1, 1))
        im.info['icc_profile'] = 'Dummy value'

        # Try save-load round trip to make sure both handle icc_profile.
        tmpfile = self.tempfile('temp.tif')
        im.save(tmpfile, 'TIFF', compression='raw')
        reloaded = Image.open(tmpfile)

        self.assertEqual(b'Dummy value', reloaded.info['icc_profile'])

    def test_close_on_load_exclusive(self):
        # similar to test_fd_leak, but runs on unixlike os
        tmpfile = self.tempfile("temp.tif")

        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        im = Image.open(tmpfile)
        fp = im.fp
        self.assertFalse(fp.closed)
        im.load()
        self.assertTrue(fp.closed)

    def test_close_on_load_nonexclusive(self):
        tmpfile = self.tempfile("temp.tif")

        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        with open(tmpfile, 'rb') as f:
            im = Image.open(f)
            fp = im.fp
            self.assertFalse(fp.closed)
            im.load()
            self.assertFalse(fp.closed)


@unittest.skipUnless(sys.platform.startswith('win32'), "Windows only")
class TestFileTiffW32(PillowTestCase):
    def test_fd_leak(self):
        tmpfile = self.tempfile("temp.tif")
        import os

        # this is an mmaped file.
        with Image.open("Tests/images/uint16_1_4660.tif") as im:
            im.save(tmpfile)

        im = Image.open(tmpfile)
        fp = im.fp
        self.assertFalse(fp.closed)
        self.assertRaises(Exception, os.remove, tmpfile)
        im.load()
        self.assertTrue(fp.closed)

        # this closes the mmap
        im.close()

        # this should not fail, as load should have closed the file pointer,
        # and close should have closed the mmap
        os.remove(tmpfile)


if __name__ == '__main__':
    unittest.main()