one more time

docs/source/whatsnew/0.8.rst

@@ -7,4 +7,5 @@ Changes in 0.8.0
 
     * Simplified writing images by moving data and options into the
       constructor.  This is backwards-incompatible with 0.7.x.
+    * Tilesize parameter is now called tileshape.
     * Deprecated :py:meth:`read` method in favor of array-style slicing.

glymur/jp2k.py

@@ -80,7 +80,8 @@ class Jp2k(Jp2kBox):
     (728, 1296, 3)
     """
 
-    def __init__(self, filename, data=None, shape=None, **kwargs):
+    def __init__(self, filename, data=None, shape=None, tileshape=None,
+                 **kwargs):
         """
         Only the filename parameter is required in order to read a JPEG 2000
         file.
@@ -93,6 +94,8 @@ class Jp2k(Jp2kBox):
             image data to be written
         shape : tuple
             size of image data, only required when image_data is not provided
+        tileshape : tuple, optional, default is same as shape
+            tile size
         cbsize : tuple, optional
             code block size (DY, DX)
         cinema2k : int, optional
@@ -133,9 +136,6 @@ class Jp2k(Jp2kBox):
             if true, write SOP marker before each packet
         subsam : tuple, optional
             subsampling factors (dy, dx)
-        tilesize : tuple, optional
-            numeric tuple specifying tile size in terms of (numrows, numcols),
-            not (X, Y)
         verbose : bool, optional
             print informational messages produced by the OpenJPEG library
         """
@@ -151,6 +151,11 @@ class Jp2k(Jp2kBox):
         else:
             self._shape = shape
 
+        if tileshape is not None:
+            self._tileshape = tileshape
+        else:
+            self._tileshape = shape
+
         self._ignore_pclr_cmap_cdef = False
         self._verbose = False
 
@@ -238,6 +243,89 @@ class Jp2k(Jp2kBox):
             metadata.append(str(codestream))
         return '\n'.join(metadata)
 
+    def __enter__(self):
+        """
+        """
+        self._determine_colorspace()
+        self._populate_cparams()
+
+        #self._cparams.cp_fixed_quality = 1
+        #self._cparams.tcp_distoratio[0] = 20
+        # set cp_fixed_quality = 1 ??
+
+        self._num_tiles_per_row = np.ceil(self.shape[1] / self._tileshape[1])
+
+        if len(self.shape) == 2:
+            num_comps = 1
+        else:
+            num_comps = self.shape[2]
+
+        # Populate comptparms
+        # Only two precisions are possible.
+        #if img_array.dtype == np.uint8:
+        comp_prec = 8
+        #else:
+        #comp_prec = 16
+        
+        if len(self.shape) == 2:
+            numrows, numcols = self.shape
+            numcops = 1
+        else:
+            numrows, numcols, num_comps = self.shape
+        comptparms = (opj2.ImageComptParmType * num_comps)()
+
+        for j in range(num_comps):
+            comptparms[j].dx = self._cparams.subsampling_dx
+            comptparms[j].dy = self._cparams.subsampling_dy
+            comptparms[j].w = numcols
+            comptparms[j].h = numrows
+            comptparms[j].x0 = self._cparams.image_offset_x0
+            comptparms[j].y0 = self._cparams.image_offset_y0
+            comptparms[j].prec = comp_prec
+            comptparms[j].bpp = comp_prec
+            comptparms[j].sgnd = 0
+        self._comptparms = comptparms
+
+        self._codec = opj2.create_compress(self._cparams.codec_fmt)
+
+        num_tile_pixels = self._cparams.cp_tdx * self._cparams.cp_tdy
+        self._tile_size = num_tile_pixels * num_comps * comptparms[j].prec / 8
+
+        #self._image = opj2.image_tile_create(self._comptparms, self._colorspace)
+        self._image = opj2.image_create(self._comptparms, self._colorspace)
+
+        self._image.contents.x0 = 0
+        self._image.contents.y0 = 0
+        self._image.contents.x1 = self.shape[1]
+        self._image.contents.y1 = self.shape[0]
+
+        # Is this needed?
+        self._image.contents.color_space = self._colorspace
+
+        opj2.setup_encoder(self._codec, self._cparams, self._image)
+        self._stream = opj2.stream_create_default_file_stream(self.filename,
+                                                              False)
+        opj2.start_compress(self._codec, self._image, self._stream)
+
+        #print('cparams')
+        #print(self._cparams)
+        #print('comptparms[0]')
+        #print(self._comptparms[0])
+        #print('comptparms[1]')
+        #print(self._comptparms[1])
+        #print('comptparms[2]')
+        #print(self._comptparms[2])
+        #print('image')
+        #print(self._image[0])
+
+        return self
+
+    def __exit__(self, *pargs):
+        opj2.end_compress(self._codec, self._stream)
+        opj2.stream_destroy(self._stream)
+        opj2.destroy_codec(self._codec)
+        opj2.image_destroy(self._image)
+
     def parse(self):
         """Parses the JPEG 2000 file.
 
@@ -350,7 +438,7 @@ class Jp2k(Jp2kBox):
                 # 2.1 API
                 self._cparams.rsiz = core.OPJ_PROFILE_CINEMA_4K
 
-    def _populate_cparams(self, img_array, **kwargs):
+    def _populate_cparams(self, **kwargs):
         """Directs processing of write method arguments.
 
         Parameters
@@ -452,9 +540,9 @@ class Jp2k(Jp2kBox):
             cparams.subsampling_dy = kwargs['subsam'][0]
             cparams.subsampling_dx = kwargs['subsam'][1]
 
-        if 'tilesize' in kwargs:
-            cparams.cp_tdx = kwargs['tilesize'][1]
-            cparams.cp_tdy = kwargs['tilesize'][0]
+        if self._tileshape is not None:
+            cparams.cp_tdx = self._tileshape[1]
+            cparams.cp_tdy = self._tileshape[0]
             cparams.tile_size_on = opj2.TRUE
 
         try:
@@ -472,7 +560,7 @@ class Jp2k(Jp2kBox):
             else:
                 cparams.tcp_mct = 0
 
-        self._validate_compression_params(img_array, cparams, **kwargs)
+        self._validate_compression_params(cparams, **kwargs)
 
         self._cparams = cparams
 
@@ -488,8 +576,27 @@ class Jp2k(Jp2kBox):
             msg += "in order to write images."
             raise RuntimeError(msg)
 
+        # What would the point of 1D images be?
+        if img_array.ndim == 1 or img_array.ndim > 3:
+            msg = "{0}D imagery is not allowed.".format(img_array.ndim)
+            raise IOError(msg)
+
+        if re.match("2.0.0", version.openjpeg_version) is not None:
+            if (((img_array.ndim != 2) and
+                 (img_array.shape[2] != 1 and img_array.shape[2] != 3))):
+                msg = "Writing images is restricted to single-channel "
+                msg += "greyscale images or three-channel RGB images when "
+                msg += "the OpenJPEG library version is the official 2.0.0 "
+                msg += "release."
+                raise IOError(msg)
+
+        if img_array.dtype != np.uint8 and img_array.dtype != np.uint16:
+            msg = "Only uint8 and uint16 datatypes are currently supported "
+            msg += "when writing."
+            raise RuntimeError(msg)
+
         self._determine_colorspace(**kwargs)
-        self._populate_cparams(img_array, **kwargs)
+        self._populate_cparams(**kwargs)
 
         if opj2.OPENJP2 is not None:
             self._write_openjp2(img_array, verbose=verbose)
@@ -563,13 +670,11 @@ class Jp2k(Jp2kBox):
 
         self.parse()
 
-    def _validate_compression_params(self, img_array, cparams, **kwargs):
+    def _validate_compression_params(self, cparams, **kwargs):
         """Check that the compression parameters are valid.
 
         Parameters
         ----------
-        img_array : ndarray
-            Image data to be written to file.
         cparams : CompressionParametersType(ctypes.Structure)
             Corresponds to cparameters_t type in openjp2 headers.
         """
@@ -614,25 +719,6 @@ class Jp2k(Jp2kBox):
                     msg += "must be powers of 2."
                     raise IOError(msg.format(prch, prcw))
 
-        # What would the point of 1D images be?
-        if img_array.ndim == 1 or img_array.ndim > 3:
-            msg = "{0}D imagery is not allowed.".format(img_array.ndim)
-            raise IOError(msg)
-
-        if re.match("2.0.0", version.openjpeg_version) is not None:
-            if (((img_array.ndim != 2) and
-                 (img_array.shape[2] != 1 and img_array.shape[2] != 3))):
-                msg = "Writing images is restricted to single-channel "
-                msg += "greyscale images or three-channel RGB images when "
-                msg += "the OpenJPEG library version is the official 2.0.0 "
-                msg += "release."
-                raise IOError(msg)
-
-        if img_array.dtype != np.uint8 and img_array.dtype != np.uint16:
-            msg = "Only uint8 and uint16 datatypes are currently supported "
-            msg += "when writing."
-            raise RuntimeError(msg)
-
     def _determine_colorspace(self, colorspace=None, **kwargs):
         """Determine the colorspace from the supplied inputs.
 
@@ -900,6 +986,52 @@ class Jp2k(Jp2kBox):
             #
             # Should have a slice object where start = stop = step = None
             self._write(data)
+
+        elif isinstance(index, tuple):
+
+            # determine what tile number to write to
+            rows, cols = index
+            if rows.start is None:
+                tr1 = 0
+            else:
+                tr1 = np.floor(rows.start / self._tileshape[0])
+            if rows.stop is None:
+                tr2 = np.floor(self._shape[0] / self._tileshape[0])
+            else:
+                tr2 = np.floor((rows.stop - 1) / self._tileshape[0])
+
+            if tr1 == tr2:
+                tile_row = tr1
+            else:
+                msg = "Slice arguments cannot cross tile boundaries."
+                raise IOError(msg)
+
+            if cols.start is None:
+                tc1 = 0
+            else:
+                tc1 = np.floor(cols.start / self._tileshape[1])
+            if rows.stop is None:
+                tc2 = np.floor(self._shape[1] / self._tileshape[1])
+            else:
+                tc2 = np.floor((cols.stop - 1) / self._tileshape[1])
+
+            if tc1 == tc2:
+                tile_col = tc1
+            else:
+                msg = "Slice arguments cannot cross tile boundaries."
+                raise IOError(msg)
+
+            num_tile_pixels = self._cparams.cp_tdx * self._cparams.cp_tdy
+            num_comps = len(self._shape)
+            if data.dtype == np.uint8:
+                nbytes = num_tile_pixels * num_comps
+            else:
+                nbytes = num_tile_pixels * num_comps * 2
+
+            tile_no = tile_row * self._num_tiles_per_row + tile_col
+            opj2.write_tile(self._codec, tile_no, data, nbytes, self._stream)
+            return
+
         else:
             msg = "Partial write operations are currently not allowed."
             raise TypeError(msg)

glymur/test/test_jp2k.py

@@ -83,6 +83,24 @@ class SliceProtocolBase(unittest.TestCase):
 @unittest.skipIf(os.name == "nt", fixtures.WINDOWS_TMP_FILE_MSG)
 class TestSliceProtocolBaseWrite(SliceProtocolBase):
 
+    def test_basic_write_by_tile_2d(self):
+        data = self.j2k_data[:, :, 0].copy()
+        with tempfile.NamedTemporaryFile(suffix='.jp2') as tfile:
+            kwargs = {
+                    'shape': (800, 480),
+                    'tileshape': (400, 240)
+            }
+            with Jp2k(tfile.name, **kwargs) as jp2:
+                jp2[:400, :240] = data[:400, :240]
+                jp2[:400, 240:480] = data[:400, 240:480]
+                jp2[400:800, :240] = data[400:800, :240]
+                jp2[400:800, 240:480] = data[400:800, 240:480]
+
+            actual = Jp2k(tfile.name).read()
+            expected = data
+            import shutil; shutil.copyfile(tfile.name, '/Users/jevans/aa.jp2')
+            np.testing.assert_array_equal(actual, expected)
+
     def test_write_ellipsis(self):
         expected = self.j2k_data
 

glymur/test/test_opj_suite_write.py

@@ -355,7 +355,7 @@ class TestSuiteWrite(fixtures.MetadataBase):
                     data=data,
                     psizes=[(128, 128)] * 3,
                     cratios=[100, 20, 2],
-                    tilesize=(480, 640),
+                    tileshape=(480, 640),
                     cbsize=(32, 32))
 
             # Should be three layers.
@@ -388,7 +388,7 @@ class TestSuiteWrite(fixtures.MetadataBase):
         infile = opj_data_file('input/nonregression/Bretagne2.ppm')
         data = read_image(infile)
         with tempfile.NamedTemporaryFile(suffix='.j2k') as tfile:
-            j = Jp2k(tfile.name, data=data, tilesize=(127, 127), prog="PCRL")
+            j = Jp2k(tfile.name, data=data, tileshape=(127, 127), prog="PCRL")
 
             codestream = j.get_codestream()