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# standard library imports
import importlib.resources as ir
import pathlib
import shutil
import tempfile
import unittest
import warnings
# 3rd party library imports
import numpy as np
# local imports
import glymur
from glymur import Jp2k
from .fixtures import OPENJPEG_NOT_AVAILABLE, OPENJPEG_NOT_AVAILABLE_MSG
@unittest.skipIf(OPENJPEG_NOT_AVAILABLE, OPENJPEG_NOT_AVAILABLE_MSG)
class TestSuite(unittest.TestCase):
@classmethod
def setUpClass(self):
"""
We need a test image without the MCT and with at least 2 quality
layers.
"""
self.testdir = tempfile.mkdtemp()
# windows won't like it if we try using tempfile.NamedTemporaryFile
# here
self.j2kfile = pathlib.Path(self.testdir) / 'tmp.j2k'
data = Jp2k(glymur.data.goodstuff())[:]
Jp2k(self.j2kfile, data=data, mct=False, cratios=[200, 100, 50])
@classmethod
def tearDownClass(self):
shutil.rmtree(self.testdir)
def test_one_component(self):
"""
SCENARIO: Decode the 1st component of an RGB image. Then restore
the original configuration of reading all bands.
EXPECTED RESULT: the data matches what we get from the regular way.
"""
j2k = Jp2k(self.j2kfile)
expected = j2k[:, :, 0]
j2k.decoded_components = 0
actual = j2k[:]
self.assertEqual(j2k.decoded_components, [0])
np.testing.assert_array_equal(actual, expected)
# restore the original configuration
j2k.decoded_components = None
actual = j2k[:]
self.assertEqual(actual.shape, (800, 480, 3))
def test_second_component(self):
"""
SCENARIO: Decode the 2nd component of a non-MCT image.
EXPECTED RESULT: Match the 2nd component read in the regular way.
"""
j2k = Jp2k(self.j2kfile)
expected = j2k[:, :, 1]
j2k.decoded_components = 1
actual = j2k[:]
np.testing.assert_array_equal(actual, expected)
def test_three_components_without_MCT(self):
"""
SCENARIO: Decode three components without using the MCT.
EXPECTED RESULT: Match the results the regular way.
"""
j2k = Jp2k(self.j2kfile)
expected = j2k[:]
j2k.decoded_components = [0, 1, 2]
actual = j2k[:]
np.testing.assert_array_equal(actual, expected)
def test_partial_component_decoding_with_area(self):
"""
SCENARIO: Decode one component with a specific area.
EXPECTED RESULT: Match the results the regular way.
"""
j2k = Jp2k(self.j2kfile)
expected = j2k[20:40, 10:30, 0]
j2k.decoded_components = 0
actual = j2k[20:40, 10:30]
np.testing.assert_array_equal(actual, expected)
def test_layer(self):
"""
SCENARIO: Decode one component with a particular layer
EXPECTED RESULT: Match the results the regular way.
"""
j2k = Jp2k(self.j2kfile)
j2k.layer = 1
expected = j2k[:, :, 0]
j2k.decoded_components = 0
actual = j2k[:]
np.testing.assert_array_equal(actual, expected)
def test_reduced_resolution(self):
"""
SCENARIO: Decode one component with reduced resolution.
EXPECTED RESULT: Match the results the regular way.
"""
j2k = Jp2k(self.j2kfile)
expected = j2k[::2, ::2, 0]
j2k.decoded_components = [0]
actual = j2k[::2, ::2]
np.testing.assert_array_equal(actual, expected)
def test_negative_component(self):
"""
SCENARIO: Provide a negative component.
EXPECTED RESULT: An ValueError is raised. There should not be any
warnings.
"""
j2k = Jp2k(self.j2kfile)
with self.assertRaises(ValueError):
with warnings.catch_warnings():
warnings.simplefilter('error')
j2k.decoded_components = -1
def test_same_component_several_times(self):
"""
SCENARIO: Decode one component multiple times.
EXPECTED RESULT: exception
"""
j2k = Jp2k(self.j2kfile)
with self.assertRaises(glymur.lib.openjp2.OpenJPEGLibraryError):
j2k.decoded_components = [0, 0]
j2k[:]
def test_invalid_component(self):
"""
SCENARIO: Decode an invalid component.
EXPECTED RESULT: exception
"""
j2k = Jp2k(self.j2kfile)
with self.assertRaises(ValueError):
j2k.decoded_components = 10
def test_differing_subsamples(self):
"""
SCENARIO: Decode a component where other components have different
subsamples.
EXPECTED RESULT: success, trying to read that component without
setting decoded_components would require us to use the read_bands
method.
"""
path = ir.files('tests.data.conformance').joinpath('p0_06.j2k')
j2k = Jp2k(path)
expected = j2k.read_bands()[0]
j2k.decoded_components = 0
actual = j2k[:]
np.testing.assert_array_equal(actual, expected)
# verify that without using decoded components, we cannot read the
# image using the slice protocol
path = ir.files('tests.data.conformance').joinpath('p0_06.j2k')
j2k = Jp2k(path)
with self.assertRaises(RuntimeError):
j2k[:, :, 0]
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