Added gemspec to be able to bundle install from git.

Added IplImage#smoothness that returns :smooth, :messy, or :blank.
Rake compile will now compile the C extension code.

ext/opencv/cvset.cpp

@@ -0,0 +1,63 @@
+/************************************************************
+
+   cvseq.cpp -
+
+   $Author: lsxi $
+
+   Copyright (C) 2005-2006 Masakazu Yonekura
+
+************************************************************/
+#include "cvset.h"
+/*
+ * Document-class: OpenCV::CvSet
+ *
+ * Collection of nodes.
+ */
+__NAMESPACE_BEGIN_OPENCV
+__NAMESPACE_BEGIN_CVSET
+
+VALUE rb_klass;
+
+VALUE
+rb_class()
+{
+  return rb_klass;
+}
+
+void
+define_ruby_class()
+{
+  if(rb_klass)
+    return;
+  /* 
+   * opencv = rb_define_module("OpenCV");
+   * cvseq = rb_define_class_under(opencv, "CvSeq", rb_cObject); 
+   *
+   * note: this comment is used by rdoc.
+   */
+  VALUE opencv = rb_module_opencv(), cvseq = cCvSeq::rb_class();
+  rb_klass = rb_define_class_under(opencv, "CvSet", cvseq);
+  rb_define_method(rb_klass, "active_count", RUBY_METHOD_FUNC(rb_active_count), 0);
+  rb_define_method(rb_klass, "free?", RUBY_METHOD_FUNC(rb_free_q), 0);
+}
+
+/*
+ * ?
+ */
+VALUE
+rb_active_count(VALUE self)
+{
+  return INT2FIX(CVSET(self)->active_count);
+}
+
+/*
+ * ?
+ */
+VALUE
+rb_free_q(VALUE self)
+{
+  return CVSET(self)->free_elems->flags < 0 ? Qtrue : Qfalse;
+}
+
+__NAMESPACE_END_CVSET
+__NAMESPACE_END_OPENCV