Pillow/Tests/test_file_libtiff.py

from __future__ import print_function
from helper import unittest, PillowTestCase, hopper, py3

import io
import logging
import os

from PIL import Image, TiffImagePlugin

logger = logging.getLogger(__name__)


class LibTiffTestCase(PillowTestCase):

    def setUp(self):
        codecs = dir(Image.core)

        if "libtiff_encoder" not in codecs or "libtiff_decoder" not in codecs:
            self.skipTest("tiff support not available")

    def _assert_noerr(self, im):
        """Helper tests that assert basic sanity about the g4 tiff reading"""
        # 1 bit
        self.assertEqual(im.mode, "1")

        # Does the data actually load
        im.load()
        im.getdata()

        try:
            self.assertEqual(im._compression, 'group4')
        except:
            print("No _compression")
            print(dir(im))

        # can we write it back out, in a different form.
        out = self.tempfile("temp.png")
        im.save(out)


class TestFileLibTiff(LibTiffTestCase):

    def test_g4_tiff(self):
        """Test the ordinary file path load path"""

        test_file = "Tests/images/hopper_g4_500.tif"
        im = Image.open(test_file)

        self.assertEqual(im.size, (500, 500))
        self._assert_noerr(im)

    def test_g4_large(self):
        test_file = "Tests/images/pport_g4.tif"
        im = Image.open(test_file)
        self._assert_noerr(im)

    def test_g4_tiff_file(self):
        """Testing the string load path"""

        test_file = "Tests/images/hopper_g4_500.tif"
        with open(test_file, 'rb') as f:
            im = Image.open(f)

            self.assertEqual(im.size, (500, 500))
            self._assert_noerr(im)

    def test_g4_tiff_bytesio(self):
        """Testing the stringio loading code path"""
        test_file = "Tests/images/hopper_g4_500.tif"
        s = io.BytesIO()
        with open(test_file, 'rb') as f:
            s.write(f.read())
            s.seek(0)
        im = Image.open(s)

        self.assertEqual(im.size, (500, 500))
        self._assert_noerr(im)

    def test_g4_eq_png(self):
        """ Checking that we're actually getting the data that we expect"""
        png = Image.open('Tests/images/hopper_bw_500.png')
        g4 = Image.open('Tests/images/hopper_g4_500.tif')

        self.assert_image_equal(g4, png)

    # see https://github.com/python-pillow/Pillow/issues/279
    def test_g4_fillorder_eq_png(self):
        """ Checking that we're actually getting the data that we expect"""
        png = Image.open('Tests/images/g4-fillorder-test.png')
        g4 = Image.open('Tests/images/g4-fillorder-test.tif')

        self.assert_image_equal(g4, png)

    def test_g4_write(self):
        """Checking to see that the saved image is the same as what we wrote"""
        test_file = "Tests/images/hopper_g4_500.tif"
        orig = Image.open(test_file)

        out = self.tempfile("temp.tif")
        rot = orig.transpose(Image.ROTATE_90)
        self.assertEqual(rot.size, (500, 500))
        rot.save(out)

        reread = Image.open(out)
        self.assertEqual(reread.size, (500, 500))
        self._assert_noerr(reread)
        self.assert_image_equal(reread, rot)
        self.assertEqual(reread.info['compression'], 'group4')

        self.assertEqual(reread.info['compression'], orig.info['compression'])

        self.assertNotEqual(orig.tobytes(), reread.tobytes())

    def test_adobe_deflate_tiff(self):
        test_file = "Tests/images/tiff_adobe_deflate.tif"
        im = Image.open(test_file)

        self.assertEqual(im.mode, "RGB")
        self.assertEqual(im.size, (278, 374))
        self.assertEqual(
            im.tile[0][:3], ('tiff_adobe_deflate', (0, 0, 278, 374), 0))
        im.load()

    def test_write_metadata(self):
        """ Test metadata writing through libtiff """
        img = Image.open('Tests/images/hopper_g4.tif')
        f = self.tempfile('temp.tiff')

        img.save(f, tiffinfo=img.tag)

        loaded = Image.open(f)

        original = img.tag.named()
        reloaded = loaded.tag.named()

        # PhotometricInterpretation is set from SAVE_INFO,
        # not the original image.
        ignored = [
            'StripByteCounts', 'RowsPerStrip',
            'PageNumber', 'PhotometricInterpretation']

        for tag, value in reloaded.items():
            if tag not in ignored:
                if tag.endswith('Resolution'):
                    val = original[tag]
                    self.assert_almost_equal(
                        val[0][0]/val[0][1], value[0][0]/value[0][1],
                        msg="%s didn't roundtrip" % tag)
                else:
                    self.assertEqual(
                        original[tag], value, "%s didn't roundtrip" % tag)

        for tag, value in original.items():
            if tag not in ignored:
                if tag.endswith('Resolution'):
                    val = reloaded[tag]
                    self.assert_almost_equal(
                        val[0][0]/val[0][1], value[0][0]/value[0][1],
                        msg="%s didn't roundtrip" % tag)
                else:
                    self.assertEqual(
                        value, reloaded[tag], "%s didn't roundtrip" % tag)

    def test_g3_compression(self):
        i = Image.open('Tests/images/hopper_g4_500.tif')
        out = self.tempfile("temp.tif")
        i.save(out, compression='group3')

        reread = Image.open(out)
        self.assertEqual(reread.info['compression'], 'group3')
        self.assert_image_equal(reread, i)

    def test_little_endian(self):
        im = Image.open('Tests/images/16bit.deflate.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')

        out = self.tempfile("temp.tif")
        # out = "temp.le.tif"
        im.save(out)
        reread = Image.open(out)

        self.assertEqual(reread.info['compression'], im.info['compression'])
        self.assertEqual(reread.getpixel((0, 0)), 480)
        # UNDONE - libtiff defaults to writing in native endian, so
        # on big endian, we'll get back mode = 'I;16B' here.

    def test_big_endian(self):
        im = Image.open('Tests/images/16bit.MM.deflate.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')

        out = self.tempfile("temp.tif")
        im.save(out)
        reread = Image.open(out)

        self.assertEqual(reread.info['compression'], im.info['compression'])
        self.assertEqual(reread.getpixel((0, 0)), 480)

    def test_g4_string_info(self):
        """Tests String data in info directory"""
        test_file = "Tests/images/hopper_g4_500.tif"
        orig = Image.open(test_file)

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

        orig.tag[269] = 'temp.tif'
        orig.save(out)

        reread = Image.open(out)
        self.assertEqual('temp.tif', reread.tag[269])

    def test_12bit_rawmode(self):
        """ Are we generating the same interpretation
        of the image as Imagemagick is? """
        TiffImagePlugin.READ_LIBTIFF = True
        im = Image.open('Tests/images/12bit.cropped.tif')
        im.load()
        TiffImagePlugin.READ_LIBTIFF = False
        # 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.

        im2 = Image.open('Tests/images/12in16bit.tif')

        logger.debug("%s", [img.getpixel((0, idx))
                            for img in [im, im2] for idx in range(3)])

        self.assert_image_equal(im, im2)

    def test_blur(self):
        # test case from irc, how to do blur on b/w image
        # and save to compressed tif.
        from PIL import ImageFilter
        out = self.tempfile('temp.tif')
        im = Image.open('Tests/images/pport_g4.tif')
        im = im.convert('L')

        im = im.filter(ImageFilter.GaussianBlur(4))
        im.save(out, compression='tiff_adobe_deflate')

        im2 = Image.open(out)
        im2.load()

        self.assert_image_equal(im, im2)

    def test_compressions(self):
        im = hopper('RGB')
        out = self.tempfile('temp.tif')

        for compression in ('packbits', 'tiff_lzw'):
            im.save(out, compression=compression)
            im2 = Image.open(out)
            self.assert_image_equal(im, im2)

        im.save(out, compression='jpeg')
        im2 = Image.open(out)
        self.assert_image_similar(im, im2, 30)

    def test_cmyk_save(self):
        im = hopper('CMYK')
        out = self.tempfile('temp.tif')

        im.save(out, compression='tiff_adobe_deflate')
        im2 = Image.open(out)
        self.assert_image_equal(im, im2)

    def xtest_bw_compression_w_rgb(self):
        """ This test passes, but when running all tests causes a failure due
            to output on stderr from the error thrown by libtiff. We need to
            capture that but not now"""

        im = hopper('RGB')
        out = self.tempfile('temp.tif')

        self.assertRaises(
            IOError, lambda: im.save(out, compression='tiff_ccitt'))
        self.assertRaises(IOError, lambda: im.save(out, compression='group3'))
        self.assertRaises(IOError, lambda: im.save(out, compression='group4'))

    def test_fp_leak(self):
        im = Image.open("Tests/images/hopper_g4_500.tif")
        fn = im.fp.fileno()

        os.fstat(fn)
        im.load()  # this should close it.
        self.assertRaises(OSError, lambda: os.fstat(fn))
        im = None  # this should force even more closed.
        self.assertRaises(OSError, lambda: os.fstat(fn))
        self.assertRaises(OSError, lambda: os.close(fn))

    def test_multipage(self):
        # issue #862
        TiffImagePlugin.READ_LIBTIFF = True
        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))
        self.assertTrue(im.tag.next)

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

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

        TiffImagePlugin.READ_LIBTIFF = False

    def test__next(self):
        TiffImagePlugin.READ_LIBTIFF = True
        im = Image.open('Tests/images/hopper.tif')
        self.assertFalse(im.tag.next)
        im.load()
        self.assertFalse(im.tag.next)

    def test_4bit(self):
        # Arrange
        test_file = "Tests/images/hopper_gray_4bpp.tif"
        original = hopper("L")

        # Act
        TiffImagePlugin.READ_LIBTIFF = True
        im = Image.open(test_file)
        TiffImagePlugin.READ_LIBTIFF = False

        # Assert
        self.assertEqual(im.size, (128, 128))
        self.assertEqual(im.mode, "L")
        self.assert_image_similar(im, original, 7.3)

    def test_save_bytesio(self):
        # PR 1011
        # Test TIFF saving to io.BytesIO() object.

        TiffImagePlugin.WRITE_LIBTIFF = True
        TiffImagePlugin.READ_LIBTIFF = True

        # Generate test image
        pilim = hopper()

        def save_bytesio(compression=None):

            buffer_io = io.BytesIO()
            pilim.save(buffer_io, format="tiff", compression=compression)
            buffer_io.seek(0)

            pilim_load = Image.open(buffer_io)
            self.assert_image_similar(pilim, pilim_load, 0)

        # save_bytesio()
        save_bytesio('raw')
        save_bytesio("packbits")
        save_bytesio("tiff_lzw")

        TiffImagePlugin.WRITE_LIBTIFF = False
        TiffImagePlugin.READ_LIBTIFF = False


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

# End of file