- Conditonally compile animation support, only if the mux.h and demux.h headers meet the ABI version requirements

- Add WEBPMUX support back to WebPDecode_wrapper (to support older versions of libwebp that have mux support, but not animation)
- Add HAVE_WEBPANIM flag, and use it appropriately
- Update documentation / tests

PIL/WebPImagePlugin.py

@@ -33,7 +33,7 @@ class WebPImageFile(ImageFile.ImageFile):
     format_description = "WebP image"
 
     def _open(self):
-        if not _webp.HAVE_WEBPMUX:
+        if not _webp.HAVE_WEBPANIM:
             # Legacy mode
             data, width, height, self.mode = _webp.WebPDecode(self.fp.read())
             self.size = width, height
@@ -80,18 +80,18 @@ class WebPImageFile(ImageFile.ImageFile):
 
     @property
     def n_frames(self):
-        if not _webp.HAVE_WEBPMUX:
+        if not _webp.HAVE_WEBPANIM:
             return 1
         return self._n_frames
 
     @property
     def is_animated(self):
-        if not _webp.HAVE_WEBPMUX:
+        if not _webp.HAVE_WEBPANIM:
             return False
         return self._n_frames > 1
 
     def seek(self, frame):
-        if not _webp.HAVE_WEBPMUX:
+        if not _webp.HAVE_WEBPANIM:
             return super(WebPImageFile, self).seek(frame)
 
         # Perform some simple checks first
@@ -141,7 +141,7 @@ class WebPImageFile(ImageFile.ImageFile):
             self._get_next()
 
     def load(self):
-        if _webp.HAVE_WEBPMUX:
+        if _webp.HAVE_WEBPANIM:
             if self.__loaded != self.__logical_frame:
                 self._seek(self.__logical_frame)
 
@@ -158,7 +158,7 @@ class WebPImageFile(ImageFile.ImageFile):
         return super(WebPImageFile, self).load()
 
     def tell(self):
-        if not _webp.HAVE_WEBPMUX:
+        if not _webp.HAVE_WEBPANIM:
             return super(WebPImageFile, self).tell()
 
         return self.__logical_frame
@@ -301,7 +301,7 @@ def _save(im, fp, filename):
 
 Image.register_open(WebPImageFile.format, WebPImageFile, _accept)
 Image.register_save(WebPImageFile.format, _save)
-if _webp.HAVE_WEBPMUX:
+if _webp.HAVE_WEBPANIM:
     Image.register_save_all(WebPImageFile.format, _save_all)
 Image.register_extension(WebPImageFile.format, ".webp")
 Image.register_mime(WebPImageFile.format, "image/webp")

PIL/features.py

@@ -43,6 +43,7 @@ def get_supported_codecs():
     return [f for f in codecs if check_codec(f)]
 
 features = {
+    "webp_anim": ("PIL._webp", 'HAVE_WEBPANIM'),
     "webp_mux": ("PIL._webp", 'HAVE_WEBPMUX'),
     "transp_webp": ("PIL._webp", "HAVE_TRANSPARENCY"),
     "raqm": ("PIL._imagingft", "HAVE_RAQM")
@@ -53,7 +54,7 @@ def check_feature(feature):
         raise ValueError("Unknown feature %s" % feature)
 
     module, flag = features[feature]
-    
+
     try:
         imported_module = __import__(module, fromlist=['PIL'])
         return getattr(imported_module, flag)
@@ -75,4 +76,4 @@ def get_supported():
     ret.extend(get_supported_features())
     ret.extend(get_supported_codecs())
     return ret
-        
+

Tests/test_features.py

@@ -35,6 +35,11 @@ class TestFeatures(PillowTestCase):
         self.assertEqual(features.check('webp_mux'),
                          _webp.HAVE_WEBPMUX)
 
+    @unittest.skipUnless(HAVE_WEBP, True)
+    def check_webp_anim(self):
+        self.assertEqual(features.check('webp_anim'),
+                         _webp.HAVE_WEBPANIM)
+
     def test_check_modules(self):
         for feature in features.modules:
             self.assertIn(features.check_module(feature), [True, False])

Tests/test_file_webp_animated.py

@@ -17,8 +17,8 @@ class TestFileWebpAnimation(PillowTestCase):
         except ImportError:
             self.skipTest('WebP support not installed')
 
-        if not _webp.HAVE_WEBPMUX:
-            self.skipTest("WebP not compiled with mux support, "
+        if not _webp.HAVE_WEBPANIM:
+            self.skipTest("WebP library does not contain animation support, "
                           "not testing animation")
 
     def test_n_frames(self):

Tests/test_file_webp_metadata.py

@@ -2,17 +2,22 @@ from helper import unittest, PillowTestCase
 
 from PIL import Image
 
+try:
+    from PIL import _webp
+    HAVE_WEBP = True
+    HAVE_WEBPMUX = _webp.HAVE_WEBPMUX
+    HAVE_WEBPANIM = _webp.HAVE_WEBPANIM
+except ImportError:
+    HAVE_WEBP = False
 
 class TestFileWebpMetadata(PillowTestCase):
 
     def setUp(self):
-        try:
-            from PIL import _webp
-        except ImportError:
+        if not HAVE_WEBP:
             self.skipTest('WebP support not installed')
             return
 
-        if not _webp.HAVE_WEBPMUX:
+        if not HAVE_WEBPMUX:
             self.skipTest('WebPMux support not installed')
 
     def test_read_exif_metadata(self):
@@ -107,6 +112,7 @@ class TestFileWebpMetadata(PillowTestCase):
 
         self.assertFalse(webp_image._getexif())
 
+    @unittest.skipUnless(HAVE_WEBPANIM, 'WebP animation support not available')
     def test_write_animated_metadata(self):
         iccp_data = '<iccp_data>'.encode('utf-8')
         exif_data = '<exif_data>'.encode('utf-8')

_webp.c

@@ -10,6 +10,19 @@
 #include <webp/mux.h>
 #include <webp/demux.h>
 
+/*
+ * 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
+ * very early versions added had some significant differences, so we require
+ * later versions, before enabling animation support.
+ */
+#if WEBP_MUX_ABI_VERSION >= 0x0104 && WEBP_DEMUX_ABI_VERSION >= 0x0105
+#define HAVE_WEBPANIM
+#endif
+#endif
+
+#ifdef HAVE_WEBPANIM
+
 /* -------------------------------------------------------------------- */
 /* WebP Muxer Error Codes                                               */
 /* -------------------------------------------------------------------- */
@@ -624,13 +637,12 @@ PyObject* WebPEncode_wrapper(PyObject* self, PyObject* args)
     Py_RETURN_NONE;
 }
 
-
 PyObject* WebPDecode_wrapper(PyObject* self, PyObject* args)
 {
     PyBytesObject* webp_string;
     const uint8_t* webp;
     Py_ssize_t size;
-    PyObject *ret = Py_None, *bytes = NULL, *pymode = NULL;
+    PyObject *ret = Py_None, *bytes = NULL, *pymode = NULL, *icc_profile = NULL, *exif = NULL;
     WebPDecoderConfig config;
     VP8StatusCode vp8_status_code = VP8_STATUS_OK;
     char* mode = "RGB";
@@ -654,7 +666,41 @@ PyObject* WebPDecode_wrapper(PyObject* self, PyObject* args)
             mode = "RGBA";
         }
 
+#ifndef HAVE_WEBPMUX
         vp8_status_code = WebPDecode(webp, size, &config);
+#else
+       {
+        int copy_data = 0;
+        WebPData data = { webp, size };
+        WebPMuxFrameInfo image;
+        WebPData icc_profile_data = {0};
+        WebPData exif_data = {0};
+
+        WebPMux* mux = WebPMuxCreate(&data, copy_data);
+        if (NULL == mux)
+            goto end;
+
+        if (WEBP_MUX_OK != WebPMuxGetFrame(mux, 1, &image))
+        {
+            WebPMuxDelete(mux);
+            goto end;
+        }
+
+        webp = image.bitstream.bytes;
+        size = image.bitstream.size;
+
+        vp8_status_code = WebPDecode(webp, size, &config);
+
+        if (WEBP_MUX_OK == WebPMuxGetChunk(mux, "ICCP", &icc_profile_data))
+            icc_profile = PyBytes_FromStringAndSize((const char*)icc_profile_data.bytes, icc_profile_data.size);
+
+        if (WEBP_MUX_OK == WebPMuxGetChunk(mux, "EXIF", &exif_data))
+            exif = PyBytes_FromStringAndSize((const char*)exif_data.bytes, exif_data.size);
+
+        WebPDataClear(&image.bitstream);
+        WebPMuxDelete(mux);
+        }
+#endif
     }
 
     if (vp8_status_code != VP8_STATUS_OK)
@@ -675,14 +721,18 @@ PyObject* WebPDecode_wrapper(PyObject* self, PyObject* args)
 #else
     pymode = PyString_FromString(mode);
 #endif
-    ret = Py_BuildValue("SiiS", bytes, config.output.width,
-                        config.output.height, pymode);
+    ret = Py_BuildValue("SiiSSS", bytes, config.output.width,
+                        config.output.height, pymode,
+                        NULL == icc_profile ? Py_None : icc_profile,
+                        NULL == exif ? Py_None : exif);
 
 end:
     WebPFreeDecBuffer(&config.output);
 
     Py_XDECREF(bytes);
     Py_XDECREF(pymode);
+    Py_XDECREF(icc_profile);
+    Py_XDECREF(exif);
 
     if (Py_None == ret)
         Py_RETURN_NONE;
@@ -714,7 +764,7 @@ PyObject* WebPDecoderBuggyAlpha_wrapper(PyObject* self, PyObject* args){
 
 static PyMethodDef webpMethods[] =
 {
-#ifdef HAVE_WEBPMUX
+#ifdef HAVE_WEBPANIM
     {"WebPAnimDecoder", _anim_decoder_new, METH_VARARGS, "WebPAnimDecoder"},
     {"WebPAnimEncoder", _anim_encoder_new, METH_VARARGS, "WebPAnimEncoder"},
 #endif
@@ -733,6 +783,14 @@ void addMuxFlagToModule(PyObject* m) {
 #endif
 }
 
+void addAnimFlagToModule(PyObject* m) {
+#ifdef HAVE_WEBPANIM
+    PyModule_AddObject(m, "HAVE_WEBPANIM", Py_True);
+#else
+    PyModule_AddObject(m, "HAVE_WEBPANIM", Py_False);
+#endif
+}
+
 void addTransparencyFlagToModule(PyObject* m) {
     PyModule_AddObject(m, "HAVE_TRANSPARENCY",
 		       PyBool_FromLong(!WebPDecoderBuggyAlpha()));
@@ -740,9 +798,10 @@ void addTransparencyFlagToModule(PyObject* m) {
 
 static int setup_module(PyObject* m) {
     addMuxFlagToModule(m);
+    addAnimFlagToModule(m);
     addTransparencyFlagToModule(m);
 
-#ifdef HAVE_WEBPMUX
+#ifdef HAVE_WEBPANIM
     /* Ready object types */
     if (PyType_Ready(&WebPAnimDecoder_Type) < 0 ||
         PyType_Ready(&WebPAnimEncoder_Type) < 0)

docs/handbook/image-file-formats.rst

@@ -683,8 +683,8 @@ Saving sequences
 .. note::
 
     Support for animated WebP files will only be enabled if the system webp
-    library was built with webpmux support. You can check webpmux support
-    at runtime by inspecting the `_webp.HAVE_WEBPMUX` module flag.
+    library is v0.5.0 or later. You can check webp animation support at
+    runtime by inspecting the `_webp.HAVE_WEBPANIM` module flag.
 
 When calling :py:meth:`~PIL.Image.Image.save`, the following options
 are available when the save_all argument is present and true.

selftest.py

@@ -178,8 +178,9 @@ if __name__ == "__main__":
         ("freetype2", "FREETYPE2"),
         ("littlecms2", "LITTLECMS2"),
         ("webp", "WEBP"),
-        ("transp_webp", "Transparent WEBP"),
+        ("transp_webp", "WEBP Transparency"),
         ("webp_mux", "WEBPMUX"),
+        ("webp_anim", "WEBP Animation"),
         ("jpg", "JPEG"),
         ("jpg_2000", "OPENJPEG (JPEG2000)"),
         ("zlib", "ZLIB (PNG/ZIP)"),