Support TeX elements in FreeType renderer. * libinterp/corefcn/txt-eng.cc: New file. Contains mapping from symbol name to character code, in Unicode and MS symbol. * libinterp/corefcn/modules.mk (COREFCN_SRC): Add txt-eng.cc. * libinterp/corefcn/oct-tex-lexer.ll: Add "\n" to rules applicable to ".", as the latter does not include new line characters. * libinterp/corefcn/oct-tex-parser.yy: Remove debug statements. * libinterp/corefcn/txt-eng.ft.cc (gripe_missing_glyph, gripe_glyph_render): Change signature from char to FT_ULong. (ft_render::ft_render): Adapt to new/removed members. (ft_render::~ft_render): Remove use of fonts member. (ft_render::set_font): Likewise. Use font instead. (ft_render::push_new_line): Likewise. Change meaning of yoffset and initialize line_yoffset. (ft_render::update_line_bbox): New method. (ft_render::set_mode): Change meaning of yoffset and initialize line_yoffset. (ft_render::process_character): New method. (ft_render::visit(text_element_string)): Use it. (ft_render::visit(text_element_list), ft_render::visit(text_element_subscript), ft_render::visit(text_element_superscript), ft_render::visit(text_element_color), ft_render::visit(text_element_fontsize), ft_render::visit(text_element_fontname), ft_render::visit(text_element_fontstyle), ft_render::visit(text_element_symbol)): New methods. (ft_render::set_color): Use color member instead of red/green/blue. * libinterp/corefcn/txt-eng-ft.h (ft_render::visit(text_element_list), ft_render::visit(text_element_subscript), ft_render::visit(text_element_superscript), ft_render::visit(text_element_color), ft_render::visit(text_element_fontsize), ft_render::visit(text_element_fontname), ft_render::visit(text_element_fontstyle), ft_render::visit(text_element_symbol)): New methods. (ft_render::update_line_bbox, ft_render::process_character): New methods. (ft_render::current_face): Removed method.i (ft_render::font): New member, replaces obsolete ft_render::fonts. (ft_render::line_yoffset): New member. (ft_render::color): New member, replaces obsolete red, green and blue. (ft_render::ft_font::ft_font()): Implement default constructor. (ft_render::ft_font::operator=): Fix incorrect use of FT_Reference_Face return value. (ft_render::ft_font::is_valid): New method. * libinterp/corefcn/txt-eng.h (class text_element_symbol, class text_element_fontname, class text_element_fontsize, class text_element_fontname, class text_element_fontstyle, class text_element_color): Add forward definition. (text_element_symbol::invalid_code): New enum. (text_element_symbol::code): New member. (text_element_symbol::text_element_symbol): Initialize it. (text_element_symbol::get_symbol_code): New method. (text_element_fontstyle::get_fontstyle): New method. (text_element_fontname::get_fontname): Renamed from fontname. (text_element_fontsize::get_fontsize): Renamed from fontsize.

## Copyright (C) 2010-2012 Kai Habel
##
## 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/>.

## -*- texinfo -*-
## @deftypefn  {Function File} {} saveas (@var{h}, @var{filename})
## @deftypefnx {Function File} {} saveas (@var{h}, @var{filename}, @var{fmt})
## Save graphic object @var{h} to the file @var{filename} in graphic
## format @var{fmt}.
##
## @var{fmt} should be one of the following formats:
##
## @table @code
##   @item ps
##     PostScript
##
##   @item eps
##     Encapsulated PostScript
##
##   @item jpg
##     JPEG Image
##
##   @item png
##     PNG Image
##
##   @item emf
##     Enhanced Meta File
##
##   @item pdf
##     Portable Document Format
## @end table
##
## All device formats specified in @code{print} may also be used.  If
## @var{fmt} is omitted it is extracted from the extension of @var{filename}.
## The default format is "pdf".
##
## @example
## @group
## clf ();
## surf (peaks);
## saveas (1, "figure1.png");
## @end group
## @end example
##
## @seealso{print, orient}
## @end deftypefn

## Author: Kai Habel

function  saveas (h, filename, fmt = "pdf")

  if ((nargin != 2) && (nargin != 3))
    print_usage ();
  endif

  if (ishandle (h))
    if (isfigure (h))
      fig = h;
    else
      fig = ancestor (h, "figure");
    endif
  else
    error ("saveas: first argument H must be a graphics handle");
  endif

  if (!ischar (filename))
    error ("saveas: FILENAME must be a string");
  endif

  if (nargin == 2)
    [~, ~, ext] = fileparts (filename);
    if (!isempty (ext))
      fmt = ext(2:end);
    endif
  endif

  if (nargin == 3)
    if (!ischar (filename))
      error ("saveas: EXT must be a string");
    endif

    [~, ~, ext] = fileparts (filename);

    if (isempty (ext))
      filename = strcat (filename, ".", fmt);
    endif
  endif

  prt_opt = strcat ("-d", tolower (fmt));

  print (fig, filename, prt_opt);

endfunction