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/cvcontourtree.cpp

@@ -0,0 +1,86 @@
+/************************************************************
+
+   cvcontourtree.cpp -
+
+   $Author: lsxi $
+
+   Copyright (C) 2007 Masakazu Yonekura
+
+************************************************************/
+#include "cvcontour.h"
+/*
+ * Document-class: OpenCV::CvContourTree
+ *
+ * Contour tree. CvContour#create_tree
+ *
+ * C structure is here.
+ *  typedef struct CvContourTree{
+ *    CV_SEQUENCE_FIELDS()
+ *    CvPoint p1;
+ *    CvPoint p2;
+ *  }CvContourTree;
+ * 
+ */
+__NAMESPACE_BEGIN_OPENCV
+__NAMESPACE_BEGIN_CVCONTOURTREE
+
+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");
+   *
+   * note: this comment is used by rdoc.
+   */
+  VALUE opencv = rb_module_opencv();
+  VALUE cvseq = cCvSeq::rb_class();
+  
+  rb_klass = rb_define_class_under(opencv, "CvContourTree", cvseq);
+  rb_define_method(rb_klass, "p1", RUBY_METHOD_FUNC(rb_p1), 0);
+  rb_define_method(rb_klass, "p2", RUBY_METHOD_FUNC(rb_p2), 0);
+  rb_define_method(rb_klass, "contour", RUBY_METHOD_FUNC(rb_contour), 0);
+
+}
+
+VALUE
+rb_p1(VALUE self)
+{
+  return REFER_OBJECT(cCvPoint::rb_class(), &CVCONTOURTREE(self)->p1, self);
+}
+
+VALUE
+rb_p2(VALUE self)
+{
+  return REFER_OBJECT(cCvPoint::rb_class(), &CVCONTOURTREE(self)->p2, self);
+}
+
+/*
+ * call-seq:
+ *   contour(<i>[criteria = 0]</i>) -> cvcontour
+ *
+ * Restores the contour from its binary tree representation.
+ * The parameter criteria determines the accuracy and/or the number of tree levels
+ * used for reconstruction, so it is possible to build approximated contour.
+ */
+VALUE
+rb_contour(int argc, VALUE *argv, VALUE self)
+{
+  VALUE criteria, storage;
+  rb_scan_args(argc, argv, "01", &criteria);
+  CvSeq *contour = cvContourFromContourTree(CVCONTOURTREE(self), CVMEMSTORAGE(storage), VALUE_TO_CVTERMCRITERIA(criteria));
+  return cCvSeq::new_sequence(cCvContour::rb_class(), contour, cCvPoint::rb_class(), storage);
+}
+
+__NAMESPACE_END_CVCONTOURTREE
+__NAMESPACE_END_OPENCV