Manual backport of #5460 to v1.5.x

cgohlke · tacaswell · commit 2e9ff448fb13 · 2016-01-02T01:39:52.000-05:00
This commit squashes 87c968b a30ec66 and cherry-picks them to the v1.5.x branch. These commits were merged to master as part of #5604 which was not backported en-mass. Original commit messages: Do not run Windows' file system convert tool On Windows, initialize the animation.convert_path setting from the Registry
diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
@@ -38,7 +38,7 @@
 from matplotlib.cbook import iterable, is_string_like
 from matplotlib.compat import subprocess
 from matplotlib import verbose
-from matplotlib import rcParams
+from matplotlib import rcParams, rcParamsDefault
 
 # Process creation flag for subprocess to prevent it raising a terminal
 # window. See for example:
@@ -267,6 +267,8 @@ def isAvailable(cls):
         Check to see if a MovieWriter subclass is actually available by
         running the commandline tool.
         '''
+        if not cls.bin_path():
+            return False
         try:
             p = subprocess.Popen(cls.bin_path(),
                              shell=False,
@@ -550,6 +552,27 @@ def delay(self):
     def output_args(self):
         return [self.outfile]
 
+    @classmethod
+    def _init_from_registry(cls):
+        if sys.platform != 'win32' or rcParams[cls.exec_key] != 'convert':
+            return
+        from matplotlib.externals.six.moves import winreg
+        for flag in (0, winreg.KEY_WOW64_32KEY, winreg.KEY_WOW64_64KEY):
+            try:
+                hkey = winreg.OpenKeyEx(winreg.HKEY_LOCAL_MACHINE,
+                                        'Software\\Imagemagick\\Current',
+                                        0, winreg.KEY_QUERY_VALUE | flag)
+                binpath = winreg.QueryValueEx(hkey, 'BinPath')[0]
+                winreg.CloseKey(hkey)
+                binpath += '\\convert.exe'
+                break
+            except Exception:
+                binpath = ''
+        rcParams[cls.exec_key] = rcParamsDefault[cls.exec_key] = binpath
+
+
+ImageMagickBase._init_from_registry()
+
 
 @writers.register('imagemagick')
 class ImageMagickWriter(MovieWriter, ImageMagickBase):
