- flake8 formatting fixes

- webp => WebP doc and comment changes

PIL/WebPImagePlugin.py

@@ -44,6 +44,7 @@ class WebPImageFile(ImageFile.ImageFile):
             self.size = width, height
             self.fp = BytesIO(data)
             self.tile = [("raw", (0, 0) + self.size, 0, self.mode)]
+            self._n_frames = 1
             return
 
         # Use the newer AnimDecoder API to parse the (possibly) animated file,
@@ -51,7 +52,8 @@ class WebPImageFile(ImageFile.ImageFile):
         self._decoder = _webp.WebPAnimDecoder(self.fp.read())
 
         # Get info from decoder
-        width, height, loop_count, bgcolor, frame_count, mode = self._decoder.get_info()
+        width, height, loop_count, bgcolor, frame_count, mode = \
+            self._decoder.get_info()
         self.size = width, height
         self.info["loop"] = loop_count
         bg_a, bg_r, bg_g, bg_b = \
@@ -85,14 +87,10 @@ class WebPImageFile(ImageFile.ImageFile):
 
     @property
     def n_frames(self):
-        if not _webp.HAVE_WEBPANIM:
-            return 1
         return self._n_frames
 
     @property
     def is_animated(self):
-        if not _webp.HAVE_WEBPANIM:
-            return False
         return self._n_frames > 1
 
     def seek(self, frame):
@@ -130,20 +128,18 @@ class WebPImageFile(ImageFile.ImageFile):
         data, timestamp = ret
         duration = timestamp - self.__timestamp
         self.__timestamp = timestamp
-        timestamp -= duration # libwebp gives frame end, adjust to start of frame
+
+        # libwebp gives frame end, adjust to start of frame
+        timestamp -= duration
         return data, timestamp, duration
 
     def _seek(self, frame):
         if self.__physical_frame == frame:
             return              # Nothing to do
-
         if frame < self.__physical_frame:
-            # Rewind to beginning
-            self._reset()
-
-        # Advance to the requested frame
+            self._reset()       # Rewind to beginning
         while self.__physical_frame < frame:
-            self._get_next()
+            self._get_next()    # Advance to the requested frame
 
     def load(self):
         if _webp.HAVE_WEBPANIM:
@@ -168,6 +164,7 @@ class WebPImageFile(ImageFile.ImageFile):
 
         return self.__logical_frame
 
+
 def _save_all(im, fp, filename):
     encoderinfo = im.encoderinfo.copy()
     append_images = encoderinfo.get("append_images", [])
@@ -207,9 +204,12 @@ def _save_all(im, fp, filename):
     # Validate background color
     if (not isinstance(background, (list, tuple)) or len(background) != 4 or
             not all(v >= 0 and v < 256 for v in background)):
-        raise IOError("Background color is not an RGBA tuple clamped to (0-255): %s" % str(background))
+        raise IOError("Background color is not an RGBA tuple clamped "
+                      "to (0-255): %s" % str(background))
+
+    # Convert to packed uint
     bg_r, bg_g, bg_b, bg_a = background
-    background = (bg_a << 24) | (bg_r << 16) | (bg_g << 8) | (bg_b << 0) # Convert to packed uint
+    background = (bg_a << 24) | (bg_r << 16) | (bg_g << 8) | (bg_b << 0)
 
     # Setup the WebP animation encoder
     enc = _webp.WebPAnimEncoder(
@@ -240,7 +240,7 @@ def _save_all(im, fp, filename):
 
                 # Make sure image mode is supported
                 frame = ims
-                if not ims.mode in _VALID_WEBP_MODES:
+                if ims.mode not in _VALID_WEBP_MODES:
                     alpha = ims.mode == 'P' and 'A' in ims.im.getpalettemode()
                     frame = ims.convert('RGBA' if alpha else 'RGBX')
 
@@ -256,7 +256,10 @@ def _save_all(im, fp, filename):
                 )
 
                 # Update timestamp and frame index
-                timestamp += duration[frame_idx] if isinstance(duration, (list, tuple)) else duration
+                if isinstance(duration, (list, tuple)):
+                    timestamp += duration[frame_idx]
+                else:
+                    timestamp += duration
                 frame_idx += 1
 
     finally:
@@ -272,10 +275,11 @@ def _save_all(im, fp, filename):
     # Get the final output from the encoder
     data = enc.assemble(icc_profile, exif, xmp)
     if data is None:
-        raise IOError("cannot write file as WEBP (encoder returned None)")
+        raise IOError("cannot write file as WebP (encoder returned None)")
 
     fp.write(data)
 
+
 def _save(im, fp, filename):
     lossless = im.encoderinfo.get("lossless", False)
     quality = im.encoderinfo.get("quality", 80)
@@ -299,7 +303,7 @@ def _save(im, fp, filename):
         xmp
     )
     if data is None:
-        raise IOError("cannot write file as WEBP (encoder returned None)")
+        raise IOError("cannot write file as WebP (encoder returned None)")
 
     fp.write(data)
 

Tests/test_file_webp.py

@@ -8,6 +8,7 @@ try:
 except ImportError:
     HAVE_WEBP = False
 
+
 class TestFileWebp(PillowTestCase):
 
     def setUp(self):
@@ -24,7 +25,7 @@ class TestFileWebp(PillowTestCase):
 
     def test_read_rgb(self):
         """
-        Can we read a RGB mode webp file without error.
+        Can we read a RGB mode WebP file without error?
         Does it have the bits we expect?
         """
 
@@ -39,7 +40,8 @@ class TestFileWebp(PillowTestCase):
 
         # generated with:
         # dwebp -ppm ../../Tests/images/hopper.webp -o hopper_webp_bits.ppm
-        target = Image.open('Tests/images/hopper_webp_bits.ppm').convert(self.rgb_mode)
+        target = Image.open('Tests/images/hopper_webp_bits.ppm')
+        target = target.convert(self.rgb_mode)
         self.assert_image_similar(image, target, 20.0)
 
     def test_write_rgb(self):
@@ -77,7 +79,7 @@ class TestFileWebp(PillowTestCase):
 
     def test_write_unsupported_mode_L(self):
         """
-        Saving a black-and-white file to webp format should work, and be
+        Saving a black-and-white file to WebP format should work, and be
         similar to the original file.
         """
 
@@ -97,7 +99,7 @@ class TestFileWebp(PillowTestCase):
 
     def test_write_unsupported_mode_P(self):
         """
-        Saving a palette-based file to webp format should work, and be
+        Saving a palette-based file to WebP format should work, and be
         similar to the original file.
         """
 

Tests/test_file_webp_alpha.py

@@ -23,7 +23,7 @@ class TestFileWebpAlpha(PillowTestCase):
 
     def test_read_rgba(self):
         """
-        Can we read a RGBA mode file without error.
+        Can we read an RGBA mode file without error?
         Does it have the bits we expect?
         """
 
@@ -44,8 +44,8 @@ class TestFileWebpAlpha(PillowTestCase):
 
     def test_write_lossless_rgb(self):
         """
-        Can we write a RGBA mode file with lossless compression without error.
-        Does it have the bits we expect?
+        Can we write an RGBA mode file with lossless compression without
+        error? Does it have the bits we expect?
         """
 
         temp_file = self.tempfile("temp.webp")
@@ -102,7 +102,7 @@ class TestFileWebpAlpha(PillowTestCase):
 
     def test_write_unsupported_mode_PA(self):
         """
-        Saving a palette-based file with transparency to webp format
+        Saving a palette-based file with transparency to WebP format
         should work, and be similar to the original file.
         """
 

Tests/test_file_webp_animated.py

@@ -1,4 +1,4 @@
-from helper import unittest, PillowTestCase, hopper
+from helper import unittest, PillowTestCase
 
 from PIL import Image
 
@@ -8,6 +8,7 @@ try:
 except ImportError:
     HAVE_WEBP = False
 
+
 class TestFileWebpAnimation(PillowTestCase):
 
     def setUp(self):
@@ -21,7 +22,7 @@ class TestFileWebpAnimation(PillowTestCase):
 
     def test_n_frames(self):
         """
-        Ensure that webp format sets n_frames and is_animated
+        Ensure that WebP format sets n_frames and is_animated
         attributes correctly.
         """
 
@@ -68,16 +69,15 @@ class TestFileWebpAnimation(PillowTestCase):
         temp_file2 = self.tempfile("temp.png")
         frame1 = Image.open('Tests/images/anim_frame1.webp')
         frame2 = Image.open('Tests/images/anim_frame2.webp')
-        frame1.save(temp_file, save_all=True, append_images=[frame2], lossless=True)
+        frame1.save(temp_file,
+            save_all=True, append_images=[frame2], lossless=True)
 
         im = Image.open(temp_file)
         self.assertEqual(im.n_frames, 2)
-        print("Test File: " + temp_file)
 
         # Compare first frame to original
         im.load()
         im.save(temp_file2)
-        print("Frame 1: " + temp_file2)
         self.assert_image_equal(im, frame1.convert("RGBA"))
 
         # Compare second frame to original
@@ -103,7 +103,7 @@ class TestFileWebpAnimation(PillowTestCase):
         self.assertEqual(im.n_frames, 5)
         self.assertTrue(im.is_animated)
 
-        # Double-check that timestamps and durations match original values specified
+        # Check that timestamps and durations match original values specified
         ts = 0
         for frame in range(im.n_frames):
             im.seek(frame)
@@ -114,7 +114,7 @@ class TestFileWebpAnimation(PillowTestCase):
 
     def test_seeking(self):
         """
-        Create an animated webp file, and then try seeking through
+        Create an animated WebP file, and then try seeking through
         frames in reverse-order, verifying the timestamps and durations
         are correct.
         """
@@ -131,7 +131,7 @@ class TestFileWebpAnimation(PillowTestCase):
         self.assertEqual(im.n_frames, 5)
         self.assertTrue(im.is_animated)
 
-        # Traverse frames in reverse order, double-check timestamps and duration
+        # Traverse frames in reverse, checking timestamps and durations
         ts = dur * (im.n_frames-1)
         for frame in reversed(range(im.n_frames)):
             im.seek(frame)

Tests/test_file_webp_lossless.py

@@ -8,6 +8,7 @@ try:
 except ImportError:
     HAVE_WEBP = False
 
+
 class TestFileWebpLossless(PillowTestCase):
 
     def setUp(self):

Tests/test_file_webp_metadata.py

@@ -8,6 +8,7 @@ try:
 except ImportError:
     HAVE_WEBP = False
 
+
 class TestFileWebpMetadata(PillowTestCase):
 
     def setUp(self):

_webp.c

@@ -12,7 +12,7 @@
 
 /*
  * Check the versions from mux.h and demux.h, to ensure the WebPAnimEncoder and
- * WebPAnimDecoder API's are present (initial support was added in 0.5.0). The
+ * WebPAnimDecoder APIs are present (initial support was added in 0.5.0). The
  * very early versions added had some significant differences, so we require
  * later versions, before enabling animation support.
  */
@@ -591,7 +591,7 @@ PyObject* WebPEncode_wrapper(PyObject* self, PyObject* args)
     }
 #else
     {
-    /* I want to truncate the *_size items that get passed into webp
+    /* I want to truncate the *_size items that get passed into WebP
        data. Pypy2.1.0 had some issues where the Py_ssize_t items had
        data in the upper byte. (Not sure why, it shouldn't have been there)
     */

docs/handbook/image-file-formats.rst

@@ -658,7 +658,7 @@ format are currently undocumented.
 The :py:meth:`~PIL.Image.Image.save` method supports the following options:
 
 **lossless**
-    If present and true, instructs the WEBP writer to use lossless compression.
+    If present and true, instructs the WebP writer to use lossless compression.
 
 **quality**
     Integer, 1-100, Defaults to 80. For lossy, 0 gives the smallest
@@ -671,23 +671,23 @@ The :py:meth:`~PIL.Image.Image.save` method supports the following options:
 
 **icc_procfile**
     The ICC Profile to include in the saved file. Only supported if
-    the system webp library was built with webpmux support.
+    the system WebP library was built with webpmux support.
 
 **exif**
     The exif data to include in the saved file. Only supported if
-    the system webp library was built with webpmux support.
+    the system WebP library was built with webpmux support.
 
 Saving sequences
 ~~~~~~~~~~~~~~~~~
 
 .. note::
 
-    Support for animated WebP files will only be enabled if the system webp
+    Support for animated WebP files will only be enabled if the system WebP
     library is v0.5.0 or later. You can check webp animation support at
-    runtime by inspecting the `_webp.HAVE_WEBPANIM` module flag.
+    runtime by calling `features.check("webp_anim")`.
 
 When calling :py:meth:`~PIL.Image.Image.save`, the following options
-are available when the save_all argument is present and true.
+are available when the `save_all` argument is present and true.
 
 **append_images**
     A list of images to append as additional frames. Each of the