test_file_jpeg2k.py

from io import BytesIO

from PIL import Image, Jpeg2KImagePlugin

from .helper import PillowTestCase

codecs = dir(Image.core)

test_card = Image.open("Tests/images/test-card.png")
test_card.load()

# OpenJPEG 2.0.0 outputs this debugging message sometimes; we should
# ignore it---it doesn't represent a test failure.
# 'Not enough memory to handle tile data'


class TestFileJpeg2k(PillowTestCase):
    def setUp(self):
        if "jpeg2k_encoder" not in codecs or "jpeg2k_decoder" not in codecs:
            self.skipTest("JPEG 2000 support not available")

    def roundtrip(self, im, **options):
        out = BytesIO()
        im.save(out, "JPEG2000", **options)
        test_bytes = out.tell()
        out.seek(0)
        im = Image.open(out)
        im.bytes = test_bytes  # for testing only
        im.load()
        return im

    def test_sanity(self):
        # Internal version number
        self.assertRegex(Image.core.jp2klib_version, r"\d+\.\d+\.\d+$")

        with Image.open("Tests/images/test-card-lossless.jp2") as im:
            px = im.load()
            self.assertEqual(px[0, 0], (0, 0, 0))
            self.assertEqual(im.mode, "RGB")
            self.assertEqual(im.size, (640, 480))
            self.assertEqual(im.format, "JPEG2000")
            self.assertEqual(im.get_format_mimetype(), "image/jp2")

    def test_jpf(self):
        with Image.open("Tests/images/balloon.jpf") as im:
            self.assertEqual(im.format, "JPEG2000")
            self.assertEqual(im.get_format_mimetype(), "image/jpx")

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

        self.assertRaises(SyntaxError, Jpeg2KImagePlugin.Jpeg2KImageFile, invalid_file)

    def test_bytesio(self):
        with open("Tests/images/test-card-lossless.jp2", "rb") as f:
            data = BytesIO(f.read())
        with Image.open(data) as im:
            im.load()
            self.assert_image_similar(im, test_card, 1.0e-3)

    # These two test pre-written JPEG 2000 files that were not written with
    # PIL (they were made using Adobe Photoshop)

    def test_lossless(self):
        with Image.open("Tests/images/test-card-lossless.jp2") as im:
            im.load()
            outfile = self.tempfile("temp_test-card.png")
            im.save(outfile)
        self.assert_image_similar(im, test_card, 1.0e-3)

    def test_lossy_tiled(self):
        with Image.open("Tests/images/test-card-lossy-tiled.jp2") as im:
            im.load()
            self.assert_image_similar(im, test_card, 2.0)

    def test_lossless_rt(self):
        im = self.roundtrip(test_card)
        self.assert_image_equal(im, test_card)

    def test_lossy_rt(self):
        im = self.roundtrip(test_card, quality_layers=[20])
        self.assert_image_similar(im, test_card, 2.0)

    def test_tiled_rt(self):
        im = self.roundtrip(test_card, tile_size=(128, 128))
        self.assert_image_equal(im, test_card)

    def test_tiled_offset_rt(self):
        im = self.roundtrip(
            test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(32, 32)
        )
        self.assert_image_equal(im, test_card)

    def test_tiled_offset_too_small(self):
        with self.assertRaises(ValueError):
            self.roundtrip(
                test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(128, 32)
            )

    def test_irreversible_rt(self):
        im = self.roundtrip(test_card, irreversible=True, quality_layers=[20])
        self.assert_image_similar(im, test_card, 2.0)

    def test_prog_qual_rt(self):
        im = self.roundtrip(test_card, quality_layers=[60, 40, 20], progression="LRCP")
        self.assert_image_similar(im, test_card, 2.0)

    def test_prog_res_rt(self):
        im = self.roundtrip(test_card, num_resolutions=8, progression="RLCP")
        self.assert_image_equal(im, test_card)

    def test_reduce(self):
        for var in ["reduce", "load_reduce"]:
            with Image.open("Tests/images/test-card-lossless.jp2") as im:
                setattr(im, var, 2)
                im.load()
                self.assertEqual(im.size, (160, 120))

    def test_layers_type(self):
        outfile = self.tempfile("temp_layers.jp2")
        for quality_layers in [[100, 50, 10], (100, 50, 10), None]:
            test_card.save(outfile, quality_layers=quality_layers)

        for quality_layers in ["quality_layers", ("100", "50", "10")]:
            self.assertRaises(
                ValueError, test_card.save, outfile, quality_layers=quality_layers
            )

    def test_layers(self):
        out = BytesIO()
        test_card.save(
            out, "JPEG2000", quality_layers=[100, 50, 10], progression="LRCP"
        )
        out.seek(0)

        with Image.open(out) as im:
            im.layers = 1
            im.load()
            self.assert_image_similar(im, test_card, 13)

        out.seek(0)
        with Image.open(out) as im:
            im.layers = 3
            im.load()
            self.assert_image_similar(im, test_card, 0.4)

    def test_rgba(self):
        # Arrange
        with Image.open("Tests/images/rgb_trns_ycbc.j2k") as j2k:
            with Image.open("Tests/images/rgb_trns_ycbc.jp2") as jp2:

                # Act
                j2k.load()
                jp2.load()

                # Assert
                self.assertEqual(j2k.mode, "RGBA")
                self.assertEqual(jp2.mode, "RGBA")

    def test_16bit_monochrome_has_correct_mode(self):
        with Image.open("Tests/images/16bit.cropped.j2k") as j2k:
            j2k.load()
            self.assertEqual(j2k.mode, "I;16")

        with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
            jp2.load()
            self.assertEqual(jp2.mode, "I;16")

    def test_16bit_monochrome_jp2_like_tiff(self):
        with Image.open("Tests/images/16bit.cropped.tif") as tiff_16bit:
            with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
                self.assert_image_similar(jp2, tiff_16bit, 1e-3)

    def test_16bit_monochrome_j2k_like_tiff(self):
        with Image.open("Tests/images/16bit.cropped.tif") as tiff_16bit:
            with Image.open("Tests/images/16bit.cropped.j2k") as j2k:
                self.assert_image_similar(j2k, tiff_16bit, 1e-3)

    def test_16bit_j2k_roundtrips(self):
        with Image.open("Tests/images/16bit.cropped.j2k") as j2k:
            im = self.roundtrip(j2k)
            self.assert_image_equal(im, j2k)

    def test_16bit_jp2_roundtrips(self):
        with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
            im = self.roundtrip(jp2)
            self.assert_image_equal(im, jp2)

    def test_unbound_local(self):
        # prepatch, a malformed jp2 file could cause an UnboundLocalError
        # exception.
        with self.assertRaises(IOError):
            Image.open("Tests/images/unbound_variable.jp2")

    def test_parser_feed(self):
        # Arrange
        from PIL import ImageFile

        with open("Tests/images/test-card-lossless.jp2", "rb") as f:
            data = f.read()

        # Act
        p = ImageFile.Parser()
        p.feed(data)

        # Assert
        self.assertEqual(p.image.size, (640, 480))