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) 2012 Michael Goffioul
##
## 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} {} uiwait
## @deftypefnx {Function File} {} uiwait (@var{h})
## @deftypefnx {Function File} {} uiwait (@var{h}, @var{timeout})
## Suspend program execution until the figure with handle @var{h} is
## deleted or @code{uiresume} is called.  When no figure handle is specified,
## this function uses the current figure.
##
## If the figure handle is invalid or there is no current figure, this
## functions returns immediately.
##
## When specified, @var{timeout} defines the number of seconds to wait
## for the figure deletion or the @code{uiresume} call.  The timeout value
## must be at least 1.  If a smaller value is specified, a warning is issued
## and a timeout value of 1 is used instead.  If a non-integer value is
## specified, it is truncated towards 0.  If @var{timeout} is not specified,
## the program execution is suspended indefinitely.
## @seealso{uiresume, waitfor}
## @end deftypefn

## Author: goffioul

function uiwait (varargin)

  h = [];
  timeout = [];

  if (nargin == 0)
    h = get (0, "currentfigure");
  else
    h = varargin{1};
    if (! isfigure (h))
      error ("uiwait: invalid figure handle H");
    endif
    if (nargin > 1)
      timeout = varargin{2};
    endif
  endif

  if (! isempty (h))
    unwind_protect
      try
        addproperty ("__uiwait_state__", h, "radio", "none|{active}|triggered");
      catch
        if (! strcmp (get (h, "__uiwait_state__"), "none"))
          error ("uiwait: an active uiwait call for this figure already exists");
        endif
        set (h, "__uiwait_state__", "active");
      end_try_catch
      waitfor_args = {h, "__uiwait_state__", "triggered"};
      if (! isempty (timeout))
        waitfor_args(end+1:end+2) = {"timeout", timeout};
      endif
      waitfor (waitfor_args{:});
    unwind_protect_cleanup
      if (ishandle (h) && isprop (h, "__uiwait_state__"))
        set (h, "__uiwait_state__", "none");
      endif
    end_unwind_protect
  endif

endfunction