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.

--- a/libinterp/corefcn/oct-tex-parser.yy	Sun Aug 18 16:36:44 2013 -0400
+++ b/libinterp/corefcn/oct-tex-parser.yy	Sun Aug 18 16:36:46 2013 -0400
@@ -94,7 +94,6 @@
 
 symbol_element			: CMD identifier
 				  {
-				    printf ("symbol: %s\n", $2->c_str ());
 				    $$ = new text_element_symbol (*$2);
 				    delete $2;
 				  }
@@ -116,7 +115,6 @@
 
 fontname_element		: FONTNAME START simple_string END
 				  {
-				    printf ("fontname: %s\n", $3->c_str ());
 				    $$ = new text_element_fontname (*$3);
 				    delete $3;
 				  }
@@ -124,20 +122,17 @@
 
 color_element			: COLOR START simple_string END
 				  {
-				    printf ("color: %s\n", $3->c_str ());
 				    $$ = new text_element_color (*$3);
 				    delete $3;
 				  }
 				| COLOR_RGB START NUM NUM NUM END
 				  {
-				    printf ("color: %g %g %g\n", $3, $4, $5);
 				    $$ = new text_element_color ($3, $4, $5);
 				  }
 				;
 
 string_element			: simple_string %prec STR
 				  {
-				    printf ("string: \"%s\"\n", $1->c_str ());
 				    $$ = new text_element_string (*$1);
 				    delete $1;
 				  }
@@ -202,5 +197,5 @@
 static void
 yyerror (text_parser_tex&, const char *s)
 {
-  fprintf (stderr, "parse error: %s\n", s);
+  fprintf (stderr, "TeX parse error: %s\n", s);
 }