Improve documentation by making all of the colors used readable,

no matter what the background color is.

Dark blue on a black background is unreadable, as is yellow on a
light background.  This patch turns on the bright attribute for
colors when on a dark background and turns *off* the bright
attribute when the -W command line option is used (indicating a
_light_ background).  This ensures that text is readable in both
cases.

Patch by: tilghman
Review: https://reviewboard.asterisk.org/r/2224
........

Merged revisions 377509 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@377510 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/xmldoc.c

@@ -354,7 +354,13 @@ char *ast_xmldoc_printable(const char *bwinput, int withcolors)
 
 			/* Setup color */
 			if (withcolors) {
-				ast_term_color_code(&colorized, colorized_tags[c].colorfg, 0);
+				if (ast_opt_light_background) {
+					/* Turn off *bright* colors */
+					ast_term_color_code(&colorized, colorized_tags[c].colorfg & 0x7f, 0);
+				} else {
+					/* Turn on *bright* colors */
+					ast_term_color_code(&colorized, colorized_tags[c].colorfg | 0x80, 0);
+				}
 				if (!colorized) {
 					return NULL;
 				}