housecleaning for 0.7.0 release

Add testing mention of CentOS, windows.
Skipping some tests on versions 1.3 and 1.4
Minor doc mods.
For whatever stupid reason, np.log2(x) cannot be relied upon to be an
integer when x is a power of 2 ON WIN32!!!  All hail win32!
Better error message if array-style slice other than [:]

glymur/jp2k.py

@@ -772,7 +772,7 @@ class Jp2k(Jp2kBox):
             # Should have a slice object where start = stop = step = None
             self.write(data)
         else:
-            msg = "Images currently must be written entirely at once."
+            msg = "Partial write operations are currently not allowed."
             raise TypeError(msg)
 
     def __getitem__(self, pargs):
@@ -832,9 +832,11 @@ class Jp2k(Jp2kBox):
         # one of them.
         step = rows_step
     
-        if np.log2(step) != np.floor(np.log2(step)):
+        # Check if the step size is a power of 2.
+        if np.abs(np.log2(step) - np.round(np.log2(step))) > 1e-6:
             msg = "Row and column strides must be powers of 2."
             raise IndexError(msg)
+        rlevel = np.int(np.round(np.log2(step)))
 
         if rows.start is None:
             rows_start = 0
@@ -857,7 +859,7 @@ class Jp2k(Jp2kBox):
             cols_stop = cols.stop
         
         area = (rows_start, cols_start, rows_stop, cols_stop)
-        data = self.read(area=area, rlevel=np.int(np.log2(step)))
+        data = self.read(area=area, rlevel=rlevel)
         if len(pargs) == 2:
             return data
 
@@ -873,7 +875,7 @@ class Jp2k(Jp2kBox):
         rlevel : int, optional
             Factor by which to rlevel output resolution.  Use -1 to get the
             lowest resolution thumbnail.  This is the only keyword option
-            available to use when only the OpenJPEG version 1.5.1 is present.
+            available to use when the OpenJPEG version is 1.5 or earlier.
         layer : int, optional
             Number of quality layer to decode.
         area : tuple, optional

glymur/test/fixtures.py

@@ -23,7 +23,8 @@ if sys.hexversion < 0x03000000:
     WARNING_INFRASTRUCTURE_MSG = "3.x warning infrastructure only"
 elif re.match('1.[0-6]', six.__version__) is not None:
     WARNING_INFRASTRUCTURE_ISSUE = True
-    WARNING_INFRASTRUCTURE_MSG = "Cannot use with this version of six"
+    msg = "Cannot run test with version {0} of python-six"
+    WARNING_INFRASTRUCTURE_MSG = msg.format(six.__version__)
 
 class MetadataBase(unittest.TestCase):
     """

glymur/test/test_config.py

@@ -71,6 +71,7 @@ class TestSuite(unittest.TestCase):
                     Jp2k(self.jp2file)
 
     @unittest.skipIf(WARNING_INFRASTRUCTURE_ISSUE, WARNING_INFRASTRUCTURE_MSG)
+    @unittest.skipIf(os.name == "nt", 'named temporary file issue on windows')
     def test_xdg_env_config_file_is_bad(self):
         """A non-existant library location should be rejected."""
         with tempfile.TemporaryDirectory() as tdir:

glymur/test/test_jp2k.py

@@ -27,6 +27,7 @@ import pkg_resources
 
 import glymur
 from glymur import Jp2k
+from glymur.version import openjpeg_version
 
 from .fixtures import HAS_PYTHON_XMP_TOOLKIT
 from .fixtures import WARNING_INFRASTRUCTURE_ISSUE, WARNING_INFRASTRUCTURE_MSG
@@ -441,8 +442,9 @@ class TestJp2k(unittest.TestCase):
             actdata = j2.read()
             self.assertTrue(fixtures.mse(actdata[0], expdata[0]) < 0.38)
 
-    @unittest.skipIf(re.match('1.5.(1|2)',
-                              glymur.version.openjpeg_version) is not None,
+    @unittest.skipIf(re.match('1.[0-4]', openjpeg_version) is not None,
+                     "Not supported with OpenJPEG {0}".format(openjpeg_version))
+    @unittest.skipIf(re.match('1.5.(1|2)', openjpeg_version) is not None,
                      "Mysteriously fails in 1.5.1 and 1.5.2")
     def test_no_cxform_pclr_jpx(self):
         """Indices for pclr jpxfile if no color transform"""
@@ -772,6 +774,8 @@ class TestJp2k(unittest.TestCase):
         self.assertEqual(data.shape, (1024, 1024, 3))
 
 
+@unittest.skipIf(re.match('1.[0-4]', openjpeg_version) is not None,
+                 "Not supported with OpenJPEG {0}".format(openjpeg_version))
 @unittest.skipIf(os.name == "nt", "NamedTemporaryFile issue on windows")
 class TestJp2k_write(unittest.TestCase):
     """Write tests, can be run by versions 1.5+"""

glymur/test/test_opj_suite_write.py

@@ -27,6 +27,7 @@ from . import fixtures
 import glymur
 from glymur import Jp2k
 from glymur.codestream import SIZsegment
+from glymur.version import openjpeg_version
 
 class CinemaBase(fixtures.MetadataBase):
 
@@ -218,6 +219,8 @@ class TestSuiteNegative2pointzero(unittest.TestCase):
                 j.write(data, cinema2k=48)
 
 
+@unittest.skipIf(re.match(r'''1.[0-4]''', openjpeg_version) is not None,
+                 "Writing not supported until OpenJPEG 1.5")
 @unittest.skipIf(os.name == "nt", "no write support on windows, period")
 @unittest.skipIf(NO_READ_BACKEND, NO_READ_BACKEND_MSG)
 @unittest.skipIf(OPJ_DATA_ROOT is None,

glymur/version.py

@@ -19,7 +19,7 @@ from .lib import openjp2 as opj2
 
 # Do not change the format of this next line!  Doing so risks breaking
 # setup.py
-version = "0.6.0"
+version = "0.7.0rc1"
 _sv = LooseVersion(version)
 version_tuple = _sv.version