Function clear_glyph_buffer

src/display.c:2106–2142

* Turn the 3rd screen into UNEXPLORED that needs to be refreshed. */

 * Turn the 3rd screen into UNEXPLORED that needs to be refreshed.
 */
void
clear_glyph_buffer(void)
{
    coordxy x, y;
    gbuf_entry *gptr = &gg.gbuf[0][0];
    glyph_info *giptr =
#ifndef UNBUFFERED_GLYPHINFO
                        &gptr->glyphinfo;
#else
                        &ginfo;

    map_glyphinfo(0, 0, GLYPH_UNEXPLORED, 0, giptr);
#endif
#ifndef UNBUFFERED_GLYPHINFO
    nul_gbuf.gnew = (giptr->ttychar != nul_gbuf.glyphinfo.ttychar
                     || giptr->gm.sym.color != nul_gbuf.glyphinfo.gm.sym.color
                     || giptr->gm.glyphflags
                        != nul_gbuf.glyphinfo.gm.glyphflags
                     || giptr->gm.customcolor
                        != nul_gbuf.glyphinfo.gm.customcolor
                     || giptr->gm.tileidx != nul_gbuf.glyphinfo.gm.tileidx)
#else
    nul_gbuf.gnew = (giptr->ttychar != ' '
                     || giptr->gm.sym.color != NO_COLOR
                     || giptr->gm.customcolor != 0
                     || (giptr->gm.glyphflags & ~MG_UNEXPL) != 0)
#endif
                         ? 1 : 0;
    for (y = 0; y < ROWNO; y++) {
        gptr = &gg.gbuf[y][0];
        for (x = COLNO; x; x--) {
            *gptr++ = nul_gbuf;
        }
        gg.gbuf_start[y] = 1;
        gg.gbuf_stop[y] = COLNO - 1;
    }
}

/* used by tty after menu or text popup has temporarily overwritten the map
   and it has been erased so shows spaces, not necessarily S_unexplored */