Fixed segfault when invoking Color before MagickWandGenesis. #586

docs/changes.rst

@@ -16,6 +16,7 @@ Unreleased.
 
  - Updated :meth:`Image.fx() <wand.image.BaseImage.fx>` method to raise :class:`~wand.exceptions.WandRuntimeError` if ImageMagick is unable to generate an image. [:issue:`582`]
  - Fixed :meth:`Image.from_array() <wand.image.Image.from_array>` classmethod to handle Numpy's strided arrays. [:issue:`582`]
+ - Fixed segmentation fault with ImageMagick 7.1.0-4X release. [:issue:`586`]
 
 
 .. _changelog-0.6.8:

wand/color.py

@@ -10,7 +10,7 @@
 from .api import library
 from .cdefs.structures import MagickPixelPacket, PixelInfo
 from .compat import binary, text
-from .resource import Resource
+from .resource import Resource, genesis
 from .version import MAGICK_VERSION_NUMBER, MAGICK_HDRI, QUANTUM_DEPTH
 
 __all__ = 'Color', 'scale_quantum_to_int8'
@@ -124,6 +124,9 @@ def __getinitargs__(self):
 
     def __enter__(self):
         if self.allocated < 1:
+            # As of 0x710, we must call MagickWandGenesis before allocate of
+            # Wand's Resource & ImageMagick PixelWand.
+            genesis()
             with self.allocate():
                 # Initialize resource.
                 self.resource = library.NewPixelWand()