Refactor folder (#10475)

Move many third-party components' source codes from the src folder to a new folder called deps_src. The goal is to make the code structure clearer and easier to navigate.

deps_src/libigl/igl/frame_to_cross_field.h

@@ -0,0 +1,39 @@
+// This file is part of libigl, a simple c++ geometry processing library.
+//
+// Copyright (C) 2014 Daniele Panozzo <daniele.panozzo@gmail.com>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public License
+// v. 2.0. If a copy of the MPL was not distributed with this file, You can
+// obtain one at http://mozilla.org/MPL/2.0/.
+#ifndef IGL_FRAME_TO_CROSS_FIELD_H
+#define IGL_FRAME_TO_CROSS_FIELD_H
+#include "igl_inline.h"
+
+#include <Eigen/Dense>
+
+namespace igl
+{
+  // Convert a frame field into its closest cross field
+  // Inputs:
+  //   V       #V by 3 coordinates of the vertices
+  //   F       #F by 3 list of mesh faces (must be triangles)
+  //   FF1     #F by 3 the first representative vector of the frame field (up to permutation and sign)
+  //   FF2     #F by 3 the second representative vector of the frame field (up to permutation and sign)
+  //
+  // Outputs:
+  //   X       #F by 3 representative vector of the closest cross field
+  //
+  IGL_INLINE void frame_to_cross_field(
+    const Eigen::MatrixXd& V,
+    const Eigen::MatrixXi& F,
+    const Eigen::MatrixXd& FF1,
+    const Eigen::MatrixXd& FF2,
+    Eigen::MatrixXd& X);
+
+}
+
+#ifndef IGL_STATIC_LIBRARY
+#  include "frame_to_cross_field.cpp"
+#endif
+
+#endif