Added FITS reading

Tests/test_file_fits.py

@@ -2,7 +2,9 @@ from io import BytesIO
 
 import pytest
 
-from PIL import FitsStubImagePlugin, Image
+from PIL import FitsImagePlugin, Image
+
+from .helper import assert_image_equal, hopper
 
 TEST_FILE = "Tests/images/hopper.fits"
 
@@ -16,6 +18,8 @@ def test_open():
         assert im.size == (128, 128)
         assert im.mode == "L"
 
+        assert_image_equal(im, hopper("L"))
+
 
 def test_invalid_file():
     # Arrange
@@ -23,23 +27,14 @@ def test_invalid_file():
 
     # Act / Assert
     with pytest.raises(SyntaxError):
-        FitsStubImagePlugin.FITSStubImageFile(invalid_file)
-
-
-def test_load():
-    # Arrange
-    with Image.open(TEST_FILE) as im:
-
-        # Act / Assert: stub cannot load without an implemented handler
-        with pytest.raises(OSError):
-            im.load()
+        FitsImagePlugin.FitsImageFile(invalid_file)
 
 
 def test_truncated_fits():
     # No END to headers
     image_data = b"SIMPLE  =                    T" + b" " * 50 + b"TRUNCATE"
     with pytest.raises(OSError):
-        FitsStubImagePlugin.FITSStubImageFile(BytesIO(image_data))
+        FitsImagePlugin.FitsImageFile(BytesIO(image_data))
 
 
 def test_naxis_zero():
@@ -48,16 +43,3 @@ def test_naxis_zero():
     with pytest.raises(ValueError):
         with Image.open("Tests/images/hopper_naxis_zero.fits"):
             pass
-
-
-def test_save():
-    # Arrange
-    with Image.open(TEST_FILE) as im:
-        dummy_fp = None
-        dummy_filename = "dummy.filename"
-
-        # Act / Assert: stub cannot save without an implemented handler
-        with pytest.raises(OSError):
-            im.save(dummy_filename)
-        with pytest.raises(OSError):
-            FitsStubImagePlugin._save(im, dummy_fp, dummy_filename)

docs/handbook/image-file-formats.rst

@@ -1064,6 +1064,11 @@ is commonly used in fax applications. The DCX decoder can read files containing
 When the file is opened, only the first image is read. You can use
 :py:meth:`~PIL.Image.Image.seek` or :py:mod:`~PIL.ImageSequence` to read other images.
 
+FITS
+^^^^
+
+Pillow identifies and reads FITS files, commonly used for astronomy.
+
 FLI, FLC
 ^^^^^^^^
 
@@ -1354,16 +1359,6 @@ Pillow provides a stub driver for BUFR files.
 To add read or write support to your application, use
 :py:func:`PIL.BufrStubImagePlugin.register_handler`.
 
-FITS
-^^^^
-
-.. versionadded:: 1.1.5
-
-Pillow provides a stub driver for FITS files.
-
-To add read or write support to your application, use
-:py:func:`PIL.FitsStubImagePlugin.register_handler`.
-
 GRIB
 ^^^^
 

docs/reference/plugins.rst

@@ -41,10 +41,10 @@ Plugin reference
     :undoc-members:
     :show-inheritance:
 
-:mod:`~PIL.FitsStubImagePlugin` Module
+:mod:`~PIL.FitsImagePlugin` Module
 --------------------------------------
 
-.. automodule:: PIL.FitsStubImagePlugin
+.. automodule:: PIL.FitsImagePlugin
     :members:
     :undoc-members:
     :show-inheritance:

src/PIL/FitsImagePlugin.py

@@ -2,44 +2,28 @@
 # The Python Imaging Library
 # $Id$
 #
-# FITS stub adapter
+# FITS file handling
 #
 # Copyright (c) 1998-2003 by Fredrik Lundh
 #
 # See the README file for information on usage and redistribution.
 #
 
+import math
+
 from . import Image, ImageFile
 
-_handler = None
-
-
-def register_handler(handler):
-    """
-    Install application-specific FITS image handler.
-
-    :param handler: Handler object.
-    """
-    global _handler
-    _handler = handler
-
-
-# --------------------------------------------------------------------
-# Image adapter
-
 
 def _accept(prefix):
     return prefix[:6] == b"SIMPLE"
 
 
-class FITSStubImageFile(ImageFile.StubImageFile):
+class FitsImageFile(ImageFile.ImageFile):
 
     format = "FITS"
     format_description = "FITS"
 
     def _open(self):
-        offset = self.fp.tell()
-
         headers = {}
         while True:
             header = self.fp.read(80)
@@ -75,26 +59,13 @@ class FITSStubImageFile(ImageFile.StubImageFile):
             self.mode = "F"
             # rawmode = "F" if number_of_bits == -32 else "F;64F"
 
-        self.fp.seek(offset)
-
-        loader = self._load()
-        if loader:
-            loader.open(self)
-
-    def _load(self):
-        return _handler
-
-
-def _save(im, fp, filename):
-    if _handler is None or not hasattr("_handler", "save"):
-        raise OSError("FITS save handler not installed")
-    _handler.save(im, fp, filename)
+        offset = math.ceil(self.fp.tell() / 2880) * 2880
+        self.tile = [("raw", (0, 0) + self.size, offset, (self.mode, 0, -1))]
 
 
 # --------------------------------------------------------------------
 # Registry
 
-Image.register_open(FITSStubImageFile.format, FITSStubImageFile, _accept)
-Image.register_save(FITSStubImageFile.format, _save)
+Image.register_open(FitsImageFile.format, FitsImageFile, _accept)
 
-Image.register_extensions(FITSStubImageFile.format, [".fit", ".fits"])
+Image.register_extensions(FitsImageFile.format, [".fit", ".fits"])

src/PIL/__init__.py

@@ -30,7 +30,7 @@ _plugins = [
     "DcxImagePlugin",
     "DdsImagePlugin",
     "EpsImagePlugin",
-    "FitsStubImagePlugin",
+    "FitsImagePlugin",
     "FliImagePlugin",
     "FpxImagePlugin",
     "FtexImagePlugin",