--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libinterp/corefcn/gl2ps-print.cc	Thu Feb 04 18:07:46 2016 -0500
@@ -0,0 +1,796 @@
+/*
+
+Copyright (C) 2009-2015 Shai Ayal
+
+This file is part of Octave.
+
+Octave is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+Octave is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with Octave; see the file COPYING.  If not, see
+<http://www.gnu.org/licenses/>.
+
+*/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "errwarn.h"
+#include "gl2ps-print.h"
+
+#ifdef HAVE_GL2PS_H
+
+#include <cstdio>
+#include <unistd.h>
+
+#include <gl2ps.h>
+
+#include "lo-mappers.h"
+#include "oct-locbuf.h"
+#include "unwind-prot.h"
+
+#include "gl-render.h"
+#include "oct-opengl.h"
+#include "sysdep.h"
+#include "txt-eng-ft.h"
+
+class
+OCTINTERP_API
+gl2ps_renderer : public opengl_renderer
+{
+public:
+
+  gl2ps_renderer (FILE *_fp, const std::string& _term)
+    : opengl_renderer () , fp (_fp), term (_term), fontsize (),
+      fontname (), buffer_overflow (false)
+  { }
+
+  ~gl2ps_renderer (void) { }
+
+  void draw (const graphics_object& go, const std::string& print_cmd);
+
+protected:
+
+  Matrix render_text (const std::string& txt,
+                      double x, double y, double z,
+                      int halign, int valign, double rotation = 0.0);
+
+  void set_font (const base_properties& props);
+
+  void draw_axes (const axes::properties& props)
+  {
+    // Initialize a sorting tree (viewport) in gl2ps for each axes
+    GLint vp[4];
+    glGetIntegerv (GL_VIEWPORT, vp);
+    gl2psBeginViewport (vp);
+
+    // Draw and finish () or there may primitives missing in the
+    // gl2ps output.
+    opengl_renderer::draw_axes (props);
+    finish ();
+
+    // Finalize viewport
+    GLint state = gl2psEndViewport ();
+    if (state == GL2PS_NO_FEEDBACK)
+      warning ("gl2ps_renderer::draw_axes: empty feedback buffer and/or nothing else to print");
+    else if (state == GL2PS_ERROR)
+      error ("gl2ps_renderer::draw_axes: gl2psEndPage returned GL2PS_ERROR");
+
+    buffer_overflow |= (state == GL2PS_OVERFLOW);
+  }
+
+  void draw_text (const text::properties& props);
+  void draw_pixels (GLsizei w, GLsizei h, GLenum format,
+                    GLenum type, const GLvoid *data);
+
+  void set_linestyle (const std::string& s, bool use_stipple = false)
+  {
+    opengl_renderer::set_linestyle (s, use_stipple);
+
+    if (s == "-" && ! use_stipple)
+      gl2psDisable (GL2PS_LINE_STIPPLE);
+    else
+      gl2psEnable (GL2PS_LINE_STIPPLE);
+  }
+
+  void set_polygon_offset (bool on, float offset = 0.0f)
+  {
+    if (on)
+      {
+        opengl_renderer::set_polygon_offset (on, offset);
+        gl2psEnable (GL2PS_POLYGON_OFFSET_FILL);
+      }
+    else
+      {
+        gl2psDisable (GL2PS_POLYGON_OFFSET_FILL);
+        opengl_renderer::set_polygon_offset (on, offset);
+      }
+  }
+
+  void set_linewidth (float w)
+  {
+    gl2psLineWidth (w);
+  }
+
+private:
+
+  // Use xform to compute the coordinates of the ft_string list
+  // that have been parsed by freetype
+  void fix_strlist_position (double x, double y, double z,
+                             Matrix box, double rotation,
+                             std::list<ft_render::ft_string>& lst);
+
+  int alignment_to_mode (int ha, int va) const;
+  FILE *fp;
+  caseless_str term;
+  double fontsize;
+  std::string fontname;
+  bool buffer_overflow;
+};
+
+void
+gl2ps_renderer::draw (const graphics_object& go, const std::string& print_cmd)
+{
+  static bool in_draw = false;
+  static std::string old_print_cmd;
+
+  if (! in_draw)
+    {
+      unwind_protect frame;
+
+      frame.protect_var (in_draw);
+
+      in_draw = true;
+
+      GLint gl2ps_term;
+      if (term.find ("eps") != std::string::npos)
+        gl2ps_term = GL2PS_EPS;
+      else if (term.find ("pdf") != std::string::npos)
+        gl2ps_term = GL2PS_PDF;
+      else if (term.find ("ps") != std::string::npos)
+        gl2ps_term = GL2PS_PS;
+      else if (term.find ("svg") != std::string::npos)
+        gl2ps_term = GL2PS_SVG;
+      else if (term.find ("pgf") != std::string::npos)
+        gl2ps_term = GL2PS_PGF;
+      else if (term.find ("tex") != std::string::npos)
+        gl2ps_term = GL2PS_TEX;
+      else
+        error ("gl2ps_renderer::draw: Unknown terminal %s", term.c_str ());
+
+      GLint gl2ps_text = 0;
+      if (term.find ("notxt") != std::string::npos)
+        gl2ps_text = GL2PS_NO_TEXT;
+
+      // Default sort order optimizes for 3D plots
+      GLint gl2ps_sort = GL2PS_BSP_SORT;
+
+      // For 2D plots we can use a simpler Z-depth sorting algorithm
+      if (term.find ("is2D") != std::string::npos)
+        gl2ps_sort = GL2PS_SIMPLE_SORT;
+
+      // Use a temporary file in case an overflow happens
+      FILE* tmpf = gnulib::tmpfile ();
+
+      if (! tmpf)
+        error ("gl2ps_renderer::draw: couldn't open temporary file for printing");
+
+      GLint buffsize = 2*1024*1024;
+      buffer_overflow = true;
+
+      while (buffer_overflow)
+        {
+          buffer_overflow = false;
+          buffsize *= 2;
+          gnulib::fseek (tmpf, 0, SEEK_SET);
+          gnulib::ftruncate (fileno (tmpf), 0);
+
+          // For LaTeX output the fltk print process uses 2 drawnow() commands.
+          // The first one is for the pdf/ps/eps graph to be included.  The
+          // print_cmd is saved as old_print_cmd.  Then the second drawnow()
+          // outputs the tex-file and the graphic filename to be included is
+          // extracted from old_print_cmd.
+
+          std::string include_graph;
+
+          size_t found_redirect = old_print_cmd.find (">");
+
+          if (found_redirect != std::string::npos)
+            include_graph = old_print_cmd.substr (found_redirect + 1);
+          else
+            include_graph = old_print_cmd;
+
+          size_t n_begin = include_graph.find_first_not_of (" ");
+
+          if (n_begin != std::string::npos)
+            {
+              size_t n_end = include_graph.find_last_not_of (" ");
+              include_graph = include_graph.substr (n_begin,
+                                                    n_end - n_begin + 1);
+            }
+          else
+            include_graph = "foobar-inc";
+
+          // GL2PS_SILENT was removed to allow gl2ps printing errors on stderr
+          GLint ret = gl2psBeginPage ("gl2ps_renderer figure", "Octave", 0,
+                                      gl2ps_term, gl2ps_sort,
+                                      (GL2PS_NO_BLENDING
+                                       | GL2PS_OCCLUSION_CULL
+                                       | GL2PS_BEST_ROOT
+                                       | gl2ps_text
+                                       | GL2PS_NO_PS3_SHADING
+                                       | GL2PS_USE_CURRENT_VIEWPORT),
+                                      GL_RGBA, 0, 0, 0, 0, 0,
+                                      buffsize, tmpf, include_graph.c_str ());
+          if (ret == GL2PS_ERROR)
+            {
+              old_print_cmd.clear ();
+              error ("gl2ps_renderer::draw: gl2psBeginPage returned GL2PS_ERROR");
+            }
+
+          opengl_renderer::draw (go);
+
+          if (! buffer_overflow)
+            old_print_cmd = print_cmd;
+
+          // Don't check return value of gl2psEndPage, it is not meaningful.
+          // Errors and warnings are checked after gl2psEndViewport in
+          // gl2ps_renderer::draw_axes instead.
+          gl2psEndPage ();
+        }
+
+      // Copy temporary file to pipe
+      gnulib::fseek (tmpf, 0, SEEK_SET);
+      char str[256];
+      int nread = 1;
+      while (! feof (tmpf) && nread)
+        {
+          nread = gnulib::fread (str, 1, 256, tmpf);
+          if (nread)
+            gnulib::fwrite (str, 1, nread, fp);
+        }
+    }
+  else
+    opengl_renderer::draw (go);
+}
+
+int
+gl2ps_renderer::alignment_to_mode (int ha, int va) const
+{
+  int gl2psa = GL2PS_TEXT_BL;
+
+  if (ha == 0)
+    {
+      if (va == 0 || va == 3)
+        gl2psa=GL2PS_TEXT_BL;
+      else if (va == 2)
+        gl2psa=GL2PS_TEXT_TL;
+      else if (va == 1)
+        gl2psa=GL2PS_TEXT_CL;
+    }
+  else if (ha == 2)
+    {
+      if (va == 0 || va == 3)
+        gl2psa=GL2PS_TEXT_BR;
+      else if (va == 2)
+        gl2psa=GL2PS_TEXT_TR;
+      else if (va == 1)
+        gl2psa=GL2PS_TEXT_CR;
+    }
+  else if (ha == 1)
+    {
+      if (va == 0 || va == 3)
+        gl2psa=GL2PS_TEXT_B;
+      else if (va == 2)
+        gl2psa=GL2PS_TEXT_T;
+      else if (va == 1)
+        gl2psa=GL2PS_TEXT_C;
+    }
+
+  return gl2psa;
+}
+
+void
+gl2ps_renderer::fix_strlist_position (double x, double y, double z,
+                                     Matrix box, double rotation,
+                                     std::list<ft_render::ft_string>& lst)
+{
+  for (std::list<ft_render::ft_string>::iterator p = lst.begin ();
+       p != lst.end (); p++)
+    {
+      // Get pixel coordinates
+      ColumnVector coord_pix = get_transform ().transform (x, y, z, false);
+
+      // Translate and rotate
+      double rot = rotation * 4.0 * atan (1.0) / 180;
+      coord_pix(0) += ((*p).get_x () + box(0))*cos (rot)
+                      - ((*p).get_y () + box(1))*sin (rot);
+      coord_pix(1) -= ((*p).get_y () + box(1))*cos (rot)
+                      + ((*p).get_x () + box(0))*sin (rot);;
+
+      // Turn coordinates back into current gl coordinates
+      ColumnVector coord =
+        get_transform ().untransform (coord_pix(0), coord_pix(1),
+                                      coord_pix(2), false);
+      (*p).set_x (coord(0));
+      (*p).set_y (coord(1));
+      (*p).set_z (coord(2));
+    }
+}
+
+static std::string
+code_to_symbol (uint32_t code)
+{
+  std::string retval;
+
+  uint32_t idx = code - 945;
+  if (idx < 25)
+    {
+      std::string characters("abgdezhqiklmnxoprVstufcyw");
+      retval = characters[idx];
+      return retval;
+    }
+
+  idx = code - 913;
+  if (idx < 25)
+    {
+      std::string characters("ABGDEZHQIKLMNXOPRVSTUFCYW");
+      retval = characters[idx];
+    }
+  else if (code == 978)
+    retval = std::string ("U");
+  else if (code == 215)
+    retval = std::string ("\xb4");
+  else if (code == 177)
+    retval = std::string ("\xb1");
+  else if (code == 8501)
+    retval = std::string ("\xc0");
+  else if (code == 8465)
+    retval = std::string ("\xc1");
+  else if (code == 8242)
+    retval = std::string ("\xa2");
+  else if (code == 8736)
+    retval = std::string ("\xd0");
+  else if (code == 172)
+    retval = std::string ("\xd8");
+  else if (code == 9829)
+    retval = std::string ("\xa9");
+  else if (code == 8472)
+    retval = std::string ("\xc3");
+  else if (code == 8706)
+    retval = std::string ("\xb6");
+  else if (code == 8704)
+    retval = std::string ("\x22");
+  else if (code == 9827)
+    retval = std::string ("\xa7");
+  else if (code == 9824)
+    retval = std::string ("\xaa");
+  else if (code == 8476)
+    retval = std::string ("\xc2");
+  else if (code == 8734)
+    retval = std::string ("\xa5");
+  else if (code == 8730)
+    retval = std::string ("\xd6");
+  else if (code == 8707)
+  retval = std::string ("\x24");
+  else if (code == 9830)
+    retval = std::string ("\xa8");
+  else if (code == 8747)
+    retval = std::string ("\xf2");
+  else if (code == 8727)
+    retval = std::string ("\x2a");
+  else if (code == 8744)
+    retval = std::string ("\xda");
+  else if (code == 8855)
+    retval = std::string ("\xc4");
+  else if (code == 8901)
+    retval = std::string ("\xd7");
+  else if (code == 8728)
+    retval = std::string ("\xb0");
+  else if (code == 8745)
+    retval = std::string ("\xc7");
+  else if (code == 8743)
+    retval = std::string ("\xd9");
+  else if (code == 8856)
+    retval = std::string ("\xc6");
+  else if (code == 8729)
+    retval = std::string ("\xb7");
+  else if (code == 8746)
+    retval = std::string ("\xc8");
+  else if (code == 8853)
+    retval = std::string ("\xc5");
+  else if (code == 8804)
+    retval = std::string ("\xa3");
+  else if (code == 8712)
+    retval = std::string ("\xce");
+  else if (code == 8839)
+    retval = std::string ("\xca");
+  else if (code == 8801)
+    retval = std::string ("\xba");
+  else if (code == 8773)
+    retval = std::string ("\x40");
+  else if (code == 8834)
+    retval = std::string ("\xcc");
+  else if (code == 8805)
+    retval = std::string ("\xb3");
+  else if (code == 8715)
+    retval = std::string ("\x27");
+  else if (code == 8764)
+    retval = std::string ("\x7e");
+  else if (code == 8733)
+    retval = std::string ("\xb5");
+  else if (code == 8838)
+    retval = std::string ("\xcd");
+  else if (code == 8835)
+    retval = std::string ("\xc9");
+  else if (code == 8739)
+    retval = std::string ("\xbd");
+  else if (code == 8776)
+    retval = std::string ("\xbb");
+  else if (code == 8869)
+    retval = std::string ("\x5e");
+  else if (code == 8656)
+    retval = std::string ("\xdc");
+  else if (code == 8592)
+    retval = std::string ("\xac");
+  else if (code == 8658)
+    retval = std::string ("\xde");
+  else if (code == 8594)
+    retval = std::string ("\xae");
+  else if (code == 8596)
+    retval = std::string ("\xab");
+  else if (code == 8593)
+    retval = std::string ("\xad");
+  else if (code == 8595)
+    retval = std::string ("\xaf");
+  else if (code == 8970)
+    retval = std::string ("\xeb");
+  else if (code == 8971)
+    retval = std::string ("\xfb");
+  else if (code == 10216)
+    retval = std::string ("\xe1");
+  else if (code == 10217)
+    retval = std::string ("\xf1");
+  else if (code == 8968)
+    retval = std::string ("\xe9");
+  else if (code == 8969)
+    retval = std::string ("\xf9");
+  else if (code == 8800)
+    retval = std::string ("\xb9");
+  else if (code == 8230)
+    retval = std::string ("\xbc");
+  else if (code == 176)
+    retval = std::string ("\xb0");
+  else if (code == 8709)
+    retval = std::string ("\xc6");
+  else if (code == 169)
+    retval = std::string ("\xd3");
+
+  if (retval.empty ())
+    warning ("print: unhandled symbol %d", code);
+
+  return retval;
+}
+
+
+static std::string
+select_font (caseless_str fn, bool isbold, bool isitalic)
+{
+  std::transform (fn.begin (), fn.end (), fn.begin (), ::tolower);
+  std::string fontname;
+  if (fn == "times" || fn == "times-roman")
+    {
+      if (isitalic && isbold)
+        fontname = "Times-BoldItalic";
+      else if (isitalic)
+        fontname = "Times-Italic";
+      else if (isbold)
+        fontname = "Times-Bold";
+      else
+        fontname = "Times-Roman";
+    }
+  else if (fn == "courier")
+    {
+      if (isitalic && isbold)
+        fontname = "Courier-BoldOblique";
+      else if (isitalic)
+        fontname = "Courier-Oblique";
+      else if (isbold)
+        fontname = "Courier-Bold";
+      else
+        fontname = "Courier";
+    }
+  else if (fn == "symbol")
+    fontname = "Symbol";
+  else if (fn == "zapfdingbats")
+    fontname = "ZapfDingbats";
+  else
+    {
+      if (isitalic && isbold)
+        fontname = "Helvetica-BoldOblique";
+      else if (isitalic)
+        fontname = "Helvetica-Oblique";
+      else if (isbold)
+        fontname = "Helvetica-Bold";
+      else
+        fontname = "Helvetica";
+    }
+  return fontname;
+}
+
+static void
+escape_character (const std::string chr, std::string& str)
+{
+  std::size_t idx = str.find (chr);
+  while (idx != std::string::npos)
+    {
+      str.insert (idx, "\\");
+      idx = str.find (chr, idx + 2);
+    }
+}
+
+Matrix
+gl2ps_renderer::render_text (const std::string& txt,
+                            double x, double y, double z,
+                            int ha, int va, double rotation)
+{
+  std::string saved_font = fontname;
+
+  if (txt.empty ())
+    return Matrix (1, 4, 0.0);
+
+  // We have no way to get a bounding box from gl2ps, so we parse the raw
+  // string using freetype
+  Matrix bbox;
+  std::string str = txt;
+  std::list<ft_render::ft_string> lst;
+
+  text_to_strlist (str, lst, bbox, ha, va, rotation);
+
+  // When using "tex" or when the string has only one line and no
+  // special characters, use gl2ps for alignment
+  if (lst.empty () || term.find ("tex") != std::string::npos
+      || (lst.size () == 1 && ! lst.front ().get_code ()))
+    {
+      std::string name = fontname;
+      int sz = fontsize;
+      if (! lst.empty () && term.find ("tex") == std::string::npos)
+        {
+          ft_render::ft_string s = lst.front ();
+          name = select_font (s.get_name (), s.get_weight () == "bold",
+                              s.get_angle () == "italic");
+          set_color (s.get_color ());
+          str = s.get_string ();
+          sz = s.get_size ();
+        }
+
+      glRasterPos3d (x, y, z);
+
+      // Escape parenthesis until gl2ps does it (see bug ##45301).
+      if (term.find ("svg") == std::string::npos
+          && term.find ("tex") == std::string::npos)
+        {
+          escape_character ("(", str);
+          escape_character (")", str);
+        }
+
+      gl2psTextOpt (str.c_str (), name.c_str (), sz,
+                    alignment_to_mode (ha, va), rotation);
+      return bbox;
+    }
+
+  // Translate and rotate coordinates in order to use bottom-left alignment
+  fix_strlist_position (x, y, z, bbox, rotation, lst);
+
+  for (std::list<ft_render::ft_string>::iterator p = lst.begin ();
+       p != lst.end (); p++)
+    {
+      fontname = select_font ((*p).get_name (),
+                              (*p).get_weight () == "bold",
+                              (*p).get_angle () == "italic");
+      if ((*p).get_code ())
+        {
+          // This is only one character represented by a uint32 (utf8) code.
+          // We replace it by the corresponding character in the
+          // "Symbol" font except for svg which has built-in utf8 support.
+          if (term.find ("svg") == std::string::npos)
+            {
+              fontname = "Symbol";
+              str = code_to_symbol ((*p).get_code ());
+            }
+          else
+            {
+              std::stringstream ss;
+              ss << (*p).get_code ();
+              str = "&#" + ss.str () + ";";
+            }
+        }
+      else
+        {
+          str = (*p).get_string ();
+          // Escape parenthesis until gl2ps does it (see bug ##45301).
+          if (term.find ("svg") == std::string::npos)
+            {
+              escape_character ("(", str);
+              escape_character (")", str);
+            }
+        }
+
+      set_color ((*p).get_color ());
+      glRasterPos3d ((*p).get_x (), (*p).get_y (), (*p).get_z ());
+      gl2psTextOpt (str.c_str (), fontname.c_str (), (*p).get_size (),
+                    GL2PS_TEXT_BL, rotation);
+    }
+
+  fontname = saved_font;
+  return bbox;
+}
+
+void
+gl2ps_renderer::set_font (const base_properties& props)
+{
+  opengl_renderer::set_font (props);
+
+  // Set the interpreter so that text_to_pixels can parse strings properly
+  if (props.has_property ("interpreter"))
+    set_interpreter (props.get ("interpreter").string_value ());
+
+  fontsize = props.get ("fontsize_points").double_value ();
+
+  caseless_str fn = props.get ("fontname").xtolower ().string_value ();
+  bool isbold =
+    (props.get ("fontweight").xtolower ().string_value () == "bold");
+  bool isitalic =
+    (props.get ("fontangle").xtolower ().string_value () == "italic");
+
+  fontname = select_font (fn, isbold, isitalic);
+}
+
+template <typename T>
+static void
+draw_pixels (GLsizei w, GLsizei h, GLenum format, const T *data, float maxval)
+{
+  OCTAVE_LOCAL_BUFFER (GLfloat, a, 3*w*h);
+
+  // Convert to GL_FLOAT as it is the only type gl2ps accepts.
+  for (int i = 0; i < 3*w*h; i++)
+    a[i] = data[i] / maxval;
+
+  gl2psDrawPixels (w, h, 0, 0, format, GL_FLOAT, a);
+}
+
+void
+gl2ps_renderer::draw_pixels (GLsizei w, GLsizei h, GLenum format,
+                            GLenum type, const GLvoid *data)
+{
+  // gl2psDrawPixels only supports the GL_FLOAT type.
+  // Other formats, such as uint8, must be converted first.
+  if (type == GL_UNSIGNED_BYTE)
+    ::draw_pixels (w, h, format, static_cast<const GLubyte *> (data), 255.0f);
+  else if (type == GL_UNSIGNED_SHORT)
+    ::draw_pixels (w, h, format, static_cast<const GLushort *> (data), 65535.0f);
+  else
+    gl2psDrawPixels (w, h, 0, 0, format, type, data);
+}
+
+void
+gl2ps_renderer::draw_text (const text::properties& props)
+{
+  if (props.get_string ().is_empty ())
+    return;
+
+  // First set font properties: freetype will use them to compute
+  // coordinates and gl2ps will retrieve the color directly from the
+  // feedback buffer
+  set_font (props);
+  set_color (props.get_color_rgb ());
+
+  std::string saved_font = fontname;
+
+  // Alignment
+  int halign = 0;
+  int valign = 0;
+
+  if (props.horizontalalignment_is ("center"))
+    halign = 1;
+  else if (props.horizontalalignment_is ("right"))
+    halign = 2;
+
+  if (props.verticalalignment_is ("top"))
+    valign = 2;
+  else if (props.verticalalignment_is ("baseline"))
+    valign = 3;
+  else if (props.verticalalignment_is ("middle"))
+    valign = 1;
+
+  // FIXME: handle margin and surrounding box
+  // Matrix bbox;
+
+  const Matrix pos = get_transform ().scale (props.get_data_position ());
+  std::string str = props.get_string ().string_vector_value ().join ("\n");
+
+  render_text (str, pos(0), pos(1), pos.numel () > 2 ? pos(2) : 0.0,
+               halign, valign, props.get_rotation ());
+}
+
+#endif
+
+static void
+safe_pclose (FILE *f)
+{
+  if (f)
+    octave_pclose (f);
+}
+
+static void
+safe_fclose (FILE *f)
+{
+  if (f)
+    gnulib::fclose (f);
+}
+
+// If the name of the stream begins with '|', open a pipe to the command
+// named by the rest of the string.  Otherwise, write to the named file.
+
+void
+gl2ps_print (const graphics_object& fig, const std::string& stream,
+             const std::string& term)
+{
+#if defined (HAVE_GL2PS_H)
+
+  // FIXME: should we have a way to create a file that begins with the
+  // character '|'?
+
+  bool have_cmd = stream.length () > 1 && stream[0] == '|';
+
+  FILE *fp = 0;
+
+  unwind_protect frame;
+
+  if (have_cmd)
+    {
+      // Create process and pipe gl2ps output to it.
+
+      std::string cmd = stream.substr (1);
+
+      fp = octave_popen (cmd.c_str (), "w");
+
+      if (! fp)
+        error ("print: failed to open pipe \"%s\"", stream.c_str ());
+
+      frame.add_fcn (safe_pclose, fp);
+    }
+  else
+    {
+      // Write gl2ps output directly to file.
+
+      fp = gnulib::fopen (stream.c_str (), "w");
+
+      if (! fp)
+        error ("gl2ps_print: failed to create file \"%s\"", stream.c_str ());
+
+      frame.add_fcn (safe_fclose, fp);
+    }
+
+  gl2ps_renderer rend (fp, term);
+
+  rend.draw (fig, "");
+
+  // Make sure buffered commands are finished!!!
+  rend.finish ();
+
+#else
+
+  err_disabled_feature ("gl2ps_print", "gl2ps");
+
+#endif
+}