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lib_vidattr.c

/****************************************************************************
 * Copyright (c) 1998,1999,2000,2001 Free Software Foundation, Inc.         *
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 * copy of this software and associated documentation files (the            *
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 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 ****************************************************************************/

/****************************************************************************
 *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
 *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
 ****************************************************************************/

/*
 *    vidputs(newmode, outc)
 *
 *    newmode is taken to be the logical 'or' of the symbols in curses.h
 *    representing graphic renditions.  The terminal is set to be in all of
 *    the given modes, if possible.
 *
 *    if the new attribute is normal
 *          if exit-alt-char-set exists
 *                emit it
 *          emit exit-attribute-mode
 *    else if set-attributes exists
 *          use it to set exactly what you want
 *    else
 *          if exit-attribute-mode exists
 *                turn off everything
 *          else
 *                turn off those which can be turned off and aren't in
 *                newmode.
 *          turn on each mode which should be on and isn't, one by one
 *
 *    NOTE that this algorithm won't achieve the desired mix of attributes
 *    in some cases, but those are probably just those cases in which it is
 *    actually impossible, anyway, so...
 *
 *    NOTE that we cannot assume that there's no interaction between color
 *    and other attribute resets.  So each time we reset color (or other
 *    attributes) we'll have to be prepared to restore the other.
 */

#include <curses.priv.h>
#include <term.h>

MODULE_ID("$Id: lib_vidattr.c,v 1.39 2001/08/26 00:40:46 Philippe.Blain Exp $")

#define doPut(mode) TPUTS_TRACE(#mode); tputs(mode, 1, outc)

#define TurnOn(mask,mode) \
      if ((turn_on & mask) && mode) { doPut(mode); }

#define TurnOff(mask,mode) \
      if ((turn_off & mask) && mode) { doPut(mode); turn_off &= ~mask; }

      /* if there is no current screen, assume we *can* do color */
#define SetColorsIf(why,old_attr) \
      if (can_color && (why)) { \
            int old_pair = PAIR_NUMBER(old_attr); \
            TR(TRACE_ATTRS, ("old pair = %d -- new pair = %d", old_pair, pair)); \
            if ((pair != old_pair) \
             || (fix_pair0 && (pair == 0)) \
             || (reverse ^ ((old_attr & A_REVERSE) != 0))) { \
                  _nc_do_color(old_pair, pair, reverse, outc); \
            } \
      }

NCURSES_EXPORT(int)
vidputs
(chtype newmode, int (*outc) (int))
{
    static attr_t previous_attr = A_NORMAL;
    attr_t turn_on, turn_off;
    int pair;
    bool reverse = FALSE;
    bool can_color = (SP == 0 || SP->_coloron);
#if NCURSES_EXT_FUNCS
    bool fix_pair0 = (SP != 0 && SP->_coloron && !SP->_default_color);
#else
#define fix_pair0 FALSE
#endif

    T((T_CALLED("vidputs(%s)"), _traceattr(newmode)));

    /* this allows us to go on whether or not newterm() has been called */
    if (SP)
      previous_attr = SP->_current_attr;

    TR(TRACE_ATTRS, ("previous attribute was %s", _traceattr(previous_attr)));

#if !USE_XMC_SUPPORT
    if ((SP != 0)
      && (magic_cookie_glitch > 0))
      newmode &= ~(SP->_xmc_suppress);
#endif

    /*
     * If we have a terminal that cannot combine color with video
     * attributes, use the colors in preference.
     */
    if (((newmode & A_COLOR) != 0
       || fix_pair0)
      && (no_color_video > 0)) {
      /*
       * If we had chosen the A_xxx definitions to correspond to the
       * no_color_video mask, we could simply shift it up and mask off the
       * attributes.  But we did not (actually copied Solaris' definitions).
       * However, this is still simpler/faster than a lookup table.
       *
       * The 63 corresponds to A_STANDOUT, A_UNDERLINE, A_REVERSE, A_BLINK,
       * A_DIM, A_BOLD which are 1:1 with no_color_video.  The bits that
       * correspond to A_INVIS, A_PROTECT (192) must be shifted up 1 and
       * A_ALTCHARSET (256) down 2 to line up.  We use the NCURSES_BITS
       * macro so this will work properly for the wide-character layout.
       */
      unsigned value = no_color_video;
      attr_t mask = NCURSES_BITS((value & 63)
                           | ((value & 192) << 1)
                           | ((value & 256) >> 2), 8);

      if ((mask & A_REVERSE) != 0
          && (newmode & A_REVERSE) != 0) {
          reverse = TRUE;
          mask &= ~A_REVERSE;
      }
      newmode &= ~mask;
    }

    if (newmode == previous_attr)
      returnCode(OK);

    pair = PAIR_NUMBER(newmode);

    if (reverse) {
      newmode &= ~A_REVERSE;
    }

    turn_off = (~newmode & previous_attr) & ALL_BUT_COLOR;
    turn_on = (newmode & ~previous_attr) & ALL_BUT_COLOR;

    SetColorsIf(((pair == 0) && !fix_pair0), previous_attr);

    if (newmode == A_NORMAL) {
      if ((previous_attr & A_ALTCHARSET) && exit_alt_charset_mode) {
          doPut(exit_alt_charset_mode);
          previous_attr &= ~A_ALTCHARSET;
      }
      if (previous_attr) {
          if (exit_attribute_mode) {
            doPut(exit_attribute_mode);
          } else {
            if (!SP || SP->_use_rmul) {
                TurnOff(A_UNDERLINE, exit_underline_mode);
            }
            if (!SP || SP->_use_rmso) {
                TurnOff(A_STANDOUT, exit_standout_mode);
            }
          }
          previous_attr &= ~A_COLOR;
      }

      SetColorsIf((pair != 0) || fix_pair0, previous_attr);
    } else if (set_attributes) {
      if (turn_on || turn_off) {
          TPUTS_TRACE("set_attributes");
          tputs(tparm(set_attributes,
                  (newmode & A_STANDOUT) != 0,
                  (newmode & A_UNDERLINE) != 0,
                  (newmode & A_REVERSE) != 0,
                  (newmode & A_BLINK) != 0,
                  (newmode & A_DIM) != 0,
                  (newmode & A_BOLD) != 0,
                  (newmode & A_INVIS) != 0,
                  (newmode & A_PROTECT) != 0,
                  (newmode & A_ALTCHARSET) != 0), 1, outc);
          previous_attr &= ~A_COLOR;
      }
      SetColorsIf((pair != 0) || fix_pair0, previous_attr);
    } else {

      TR(TRACE_ATTRS, ("turning %s off", _traceattr(turn_off)));

      TurnOff(A_ALTCHARSET, exit_alt_charset_mode);

      if (!SP || SP->_use_rmul) {
          TurnOff(A_UNDERLINE, exit_underline_mode);
      }

      if (!SP || SP->_use_rmso) {
          TurnOff(A_STANDOUT, exit_standout_mode);
      }

      if (turn_off && exit_attribute_mode) {
          doPut(exit_attribute_mode);
          turn_on |= (newmode & (chtype) (~A_COLOR));
          previous_attr &= ~A_COLOR;
      }
      SetColorsIf((pair != 0) || fix_pair0, previous_attr);

      TR(TRACE_ATTRS, ("turning %s on", _traceattr(turn_on)));
      /* *INDENT-OFF* */
      TurnOn(A_ALTCHARSET,    enter_alt_charset_mode);
      TurnOn(A_BLINK,         enter_blink_mode);
      TurnOn(A_BOLD,          enter_bold_mode);
      TurnOn(A_DIM,           enter_dim_mode);
      TurnOn(A_REVERSE, enter_reverse_mode);
      TurnOn(A_STANDOUT,      enter_standout_mode);
      TurnOn(A_PROTECT, enter_protected_mode);
      TurnOn(A_INVIS,         enter_secure_mode);
      TurnOn(A_UNDERLINE,     enter_underline_mode);
#ifdef enter_horizontal_hl_mode
      TurnOn(A_HORIZONTAL,    enter_horizontal_hl_mode);
#endif
#ifdef enter_left_hl_mode
      TurnOn(A_LEFT,          enter_left_hl_mode);
#endif
#ifdef enter_low_hl_mode
      TurnOn(A_LOW,           enter_low_hl_mode);
#endif
#ifdef enter_right_hl_mode
      TurnOn(A_RIGHT,         enter_right_hl_mode);
#endif
#ifdef enter_top_hl_mode
      TurnOn(A_TOP,           enter_top_hl_mode);
#endif
#ifdef enter_vertical_hl_mode
      TurnOn(A_VERTICAL,      enter_vertical_hl_mode);
#endif
      /* *INDENT-ON* */

    }

    if (reverse)
      newmode |= A_REVERSE;

    if (SP)
      SP->_current_attr = newmode;
    else
      previous_attr = newmode;

    returnCode(OK);
}

NCURSES_EXPORT(int)
vidattr(chtype newmode)
{
    T((T_CALLED("vidattr(%s)"), _traceattr(newmode)));

    returnCode(vidputs(newmode, _nc_outch));
}

NCURSES_EXPORT(chtype)
termattrs(void)
{
    chtype attrs = A_NORMAL;

    T((T_CALLED("termattrs()")));
    if (enter_alt_charset_mode)
      attrs |= A_ALTCHARSET;

    if (enter_blink_mode)
      attrs |= A_BLINK;

    if (enter_bold_mode)
      attrs |= A_BOLD;

    if (enter_dim_mode)
      attrs |= A_DIM;

    if (enter_reverse_mode)
      attrs |= A_REVERSE;

    if (enter_standout_mode)
      attrs |= A_STANDOUT;

    if (enter_protected_mode)
      attrs |= A_PROTECT;

    if (enter_secure_mode)
      attrs |= A_INVIS;

    if (enter_underline_mode)
      attrs |= A_UNDERLINE;

    if (SP->_coloron)
      attrs |= A_COLOR;

    returnChar(attrs);
}

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