introduce support for coloring the frame behind a map location

Also includes support by paxed for polearm targeting using the
frame color.

Also renames USE_TILES to TILES_IN_GLYPHMAP which is a more
accurate description.

Not all window interfaces have full support for the color framing
of the background square yet.

MS-DOS needs further work (to bring it to both VESA and VGA, with
and without tiles.

Windows GUI is missing support.

X11 and Qt have been started, but may require further refinement.

win/tty/termcap.c

@@ -1438,6 +1438,14 @@ term_start_color(int color)
     if (color < CLR_MAX && hilites[color] && *hilites[color])
         xputs(hilites[color]);
 }
+
+void
+term_start_bgcolor(int color)
+{
+    char tmp[8];
+    Sprintf(tmp, "\033[%dm", ((color % 8) + 40));
+    xputs(tmp);
+}
 #endif /* TEXTCOLOR */
 
 #ifdef ENHANCED_SYMBOLS

win/tty/wintty.c

@@ -185,7 +185,7 @@ static char winpanicstr[] = "Bad window id %d";
 char defmorestr[] = "--More--";
 
 #ifdef CLIPPING
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
 boolean clipping = FALSE; /* clipping on? */
 int clipx = 0, clipxmax = 0;
 int clipy = 0, clipymax = 0;
@@ -196,7 +196,7 @@ static int clipy = 0, clipymax = 0;
 #endif
 #endif /* CLIPPING */
 
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
 extern void adjust_cursor_flags(struct WinDesc *);
 #endif
 
@@ -835,7 +835,7 @@ tty_create_nhwindow(int type)
             iflags.wc2_statuslines = 2;
         newwin->offx = 0;
         rowoffset = ttyDisplay->rows - iflags.wc2_statuslines;
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
         if (iflags.grmode) {
             newwin->offy = rowoffset;
         } else
@@ -1946,7 +1946,7 @@ tty_curs(winid window,
 
     print_vt_code2(AVTC_SELECT_WINDOW, window);
 
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
     adjust_cursor_flags(cw);
 #endif
     cw->curx = --x; /* column 0 is never used */
@@ -3291,7 +3291,7 @@ docorner(register int xmin, register int ymax, int ystart_between_menu_pages)
 #ifdef CLIPPING
         if (y < (int) cw->offy || y + clipy > ROWNO)
             continue; /* only refresh board */
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
         if (iflags.tile_view)
             row_refresh((xmin / 2) + clipx - ((int) cw->offx / 2), COLNO - 1,
                         y + clipy - (int) cw->offy);
@@ -3441,7 +3441,7 @@ tty_print_glyph(
     winid window,
     coordxy x, coordxy y,
     const glyph_info *glyphinfo,
-    const glyph_info *bkglyphinfo UNUSED)
+    const glyph_info *bkglyphinfo)
 {
     boolean inverse_on = FALSE, colordone = FALSE, glyphdone = FALSE;
     int ch, color;
@@ -3508,7 +3508,13 @@ tty_print_glyph(
        BW_LAVA and BW_ICE won't ever be set when color is on;
        (tried bold for ice but it didn't look very good; inverse is easier
        to see although the Valkyrie quest ends up being hard on the eyes) */
-    if (((special & MG_PET) != 0 && iflags.hilite_pet)
+    if (iflags.use_color
+        && bkglyphinfo && bkglyphinfo->framecolor != NO_COLOR) {
+#ifdef TEXTCOLOR
+        ttyDisplay->framecolor = bkglyphinfo->framecolor;
+        term_start_bgcolor(bkglyphinfo->framecolor);
+#endif
+    } else if (((special & MG_PET) != 0 && iflags.hilite_pet)
         || ((special & MG_OBJPILE) != 0 && iflags.hilite_pile)
         || ((special & MG_FEMALE) != 0 && wizard && iflags.wizmgender)
         || ((special & (MG_DETECT | MG_BW_LAVA | MG_BW_ICE | MG_BW_SINK)) != 0
@@ -3517,9 +3523,9 @@ tty_print_glyph(
         inverse_on = TRUE;
     }
 
-#if defined(USE_TILES) && defined(MSDOS)
+#if defined(TILES_IN_GLYPHMAP) && defined(MSDOS)
     if (iflags.grmode && iflags.tile_view) {
-        xputg(glyphinfo);
+        xputg(glyphinfo, bkglyphinfo);
         glyphdone = TRUE;
     }
 #endif
@@ -3542,9 +3548,9 @@ tty_print_glyph(
         /* turn off color as well, turning off ATR_INVERSE may have done
           this already and if so, we won't know the current state unless
           we do it explicitly */
-        if (ttyDisplay->color != NO_COLOR) {
+        if (ttyDisplay->color != NO_COLOR || ttyDisplay->framecolor != NO_COLOR) {
             term_end_color();
-            ttyDisplay->color = NO_COLOR;
+            ttyDisplay->color = ttyDisplay->framecolor = NO_COLOR;
         }
 #endif
 #ifdef ENHANCED_SYMBOLS
@@ -3558,6 +3564,16 @@ tty_print_glyph(
     ttyDisplay->curx++;   /* the real cursor moved too */
 }
 
+#ifdef NO_TERMS  /* termcap.o isn't linked in */
+#if !defined(MSDOS) && !defined(WIN32)
+void
+term_start_bgcolor(int color)
+{
+    /* placeholder for now */
+}
+#endif  /* !MSDOS && !WIN32 */
+#endif  /* NO_TERMS */
+
 void
 tty_raw_print(const char *str)
 {