ncurses/tty/lib_vidattr.c

   1 /****************************************************************************
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  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  *     and: Thomas E. Dickey                        1996-on                 *
  33  *     and: Juergen Pfeifer                         2009                    *
  34  ****************************************************************************/
  35
  36 /*
  37  *      vidputs(newmode, outc)
  38  *
  39  *      newmode is taken to be the logical 'or' of the symbols in curses.h
  40  *      representing graphic renditions.  The terminal is set to be in all of
  41  *      the given modes, if possible.
  42  *
  43  *      if the new attribute is normal
  44  *              if exit-alt-char-set exists
  45  *                      emit it
  46  *              emit exit-attribute-mode
  47  *      else if set-attributes exists
  48  *              use it to set exactly what you want
  49  *      else
  50  *              if exit-attribute-mode exists
  51  *                      turn off everything
  52  *              else
  53  *                      turn off those which can be turned off and aren't in
  54  *                      newmode.
  55  *              turn on each mode which should be on and isn't, one by one
  56  *
  57  *      NOTE that this algorithm won't achieve the desired mix of attributes
  58  *      in some cases, but those are probably just those cases in which it is
  59  *      actually impossible, anyway, so...
  60  *
  61  *      NOTE that we cannot assume that there's no interaction between color
  62  *      and other attribute resets.  So each time we reset color (or other
  63  *      attributes) we'll have to be prepared to restore the other.
  64  */
  65
  66 #include <curses.priv.h>
  67
  68 #ifndef CUR
  69 #define CUR SP_TERMTYPE
  70 #endif
  71
  72 MODULE_ID("$Id: lib_vidattr.c,v 1.61 2010/06/05 22:22:04 tom Exp $")
  73
  74 #define doPut(mode) \
  75         TPUTS_TRACE(#mode); \
  76         NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx mode, 1, outc)
  77
  78 #define TurnOn(mask,mode) \
  79         if ((turn_on & mask) && mode) { doPut(mode); }
  80
  81 #define TurnOff(mask,mode) \
  82         if ((turn_off & mask) && mode) { doPut(mode); turn_off &= ~mask; }
  83
  84         /* if there is no current screen, assume we *can* do color */
  85 #define SetColorsIf(why,old_attr) \
  86         if (can_color && (why)) { \
  87                 int old_pair = PairNumber(old_attr); \
  88                 TR(TRACE_ATTRS, ("old pair = %d -- new pair = %d", old_pair, pair)); \
  89                 if ((pair != old_pair) \
  90                  || (fix_pair0 && (pair == 0)) \
  91                  || (reverse ^ ((old_attr & A_REVERSE) != 0))) { \
  92                      NCURSES_SP_NAME(_nc_do_color)(NCURSES_SP_ARGx \
  93                                      (short) old_pair, \
  94                                      (short) pair, \
  95                                      reverse, outc); \
  96                 } \
  97         }
  98
  99 #define PreviousAttr _nc_prescreen.previous_attr
 100
 101 NCURSES_EXPORT(int)
 102 NCURSES_SP_NAME(vidputs) (NCURSES_SP_DCLx
 103                           chtype newmode,
 104                           NCURSES_SP_OUTC outc)
 105 {
 106     attr_t turn_on, turn_off;
 107     int pair;
 108     bool reverse = FALSE;
 109     bool can_color = (SP_PARM == 0 || SP_PARM->_coloron);
 110 #ifdef NCURSES_EXT_FUNCS
 111     bool fix_pair0 = (SP_PARM != 0 && SP_PARM->_coloron && !SP_PARM->_default_color);
 112 #else
 113 #define fix_pair0 FALSE
 114 #endif
 115
 116     newmode &= A_ATTRIBUTES;
 117
 118     T((T_CALLED("vidputs(%p,%s)"), (void *) SP_PARM, _traceattr(newmode)));
 119
 120     if (!IsTermInfo(SP_PARM))
 121         returnCode(ERR);
 122
 123     /* this allows us to go on whether or not newterm() has been called */
 124     if (SP_PARM)
 125         PreviousAttr = AttrOf(SCREEN_ATTRS(SP_PARM));
 126
 127     TR(TRACE_ATTRS, ("previous attribute was %s", _traceattr(PreviousAttr)));
 128
 129     if ((SP_PARM != 0)
 130         && (magic_cookie_glitch > 0)) {
 131 #if defined(USE_XMC_SUPPORT)
 132         static const chtype table[] =
 133         {
 134             A_STANDOUT,
 135             A_UNDERLINE,
 136             A_REVERSE,
 137             A_BLINK,
 138             A_DIM,
 139             A_BOLD,
 140             A_INVIS,
 141             A_PROTECT,
 142         };
 143         unsigned n;
 144         int used = 0;
 145         int limit = (max_attributes <= 0) ? 1 : max_attributes;
 146         chtype retain = 0;
 147
 148         /*
 149          * Limit the number of attribute bits set in the newmode according to
 150          * the terminfo max_attributes value.
 151          */
 152         for (n = 0; n < SIZEOF(table); ++n) {
 153             if ((table[n] & SP_PARM->_ok_attributes) == 0) {
 154                 newmode &= ~table[n];
 155             } else if ((table[n] & newmode) != 0) {
 156                 if (used++ >= limit) {
 157                     newmode &= ~table[n];
 158                     if (newmode == retain)
 159                         break;
 160                 } else {
 161                     retain = newmode;
 162                 }
 163             }
 164         }
 165 #else
 166         newmode &= ~(SP_PARM->_xmc_suppress);
 167 #endif
 168         TR(TRACE_ATTRS, ("suppressed attribute is %s", _traceattr(newmode)));
 169     }
 170
 171     /*
 172      * If we have a terminal that cannot combine color with video
 173      * attributes, use the colors in preference.
 174      */
 175     if (((newmode & A_COLOR) != 0
 176          || fix_pair0)
 177         && (no_color_video > 0)) {
 178         /*
 179          * If we had chosen the A_xxx definitions to correspond to the
 180          * no_color_video mask, we could simply shift it up and mask off the
 181          * attributes.  But we did not (actually copied Solaris' definitions).
 182          * However, this is still simpler/faster than a lookup table.
 183          *
 184          * The 63 corresponds to A_STANDOUT, A_UNDERLINE, A_REVERSE, A_BLINK,
 185          * A_DIM, A_BOLD which are 1:1 with no_color_video.  The bits that
 186          * correspond to A_INVIS, A_PROTECT (192) must be shifted up 1 and
 187          * A_ALTCHARSET (256) down 2 to line up.  We use the NCURSES_BITS
 188          * macro so this will work properly for the wide-character layout.
 189          */
 190         unsigned value = (unsigned) no_color_video;
 191         attr_t mask = NCURSES_BITS((value & 63)
 192                                    | ((value & 192) << 1)
 193                                    | ((value & 256) >> 2), 8);
 194
 195         if ((mask & A_REVERSE) != 0
 196             && (newmode & A_REVERSE) != 0) {
 197             reverse = TRUE;
 198             mask &= ~A_REVERSE;
 199         }
 200         newmode &= ~mask;
 201     }
 202
 203     if (newmode == PreviousAttr)
 204         returnCode(OK);
 205
 206     pair = PairNumber(newmode);
 207
 208     if (reverse) {
 209         newmode &= ~A_REVERSE;
 210     }
 211
 212     turn_off = (~newmode & PreviousAttr) & ALL_BUT_COLOR;
 213     turn_on = (newmode & ~PreviousAttr) & ALL_BUT_COLOR;
 214
 215     SetColorsIf(((pair == 0) && !fix_pair0), PreviousAttr);
 216
 217     if (newmode == A_NORMAL) {
 218         if ((PreviousAttr & A_ALTCHARSET) && exit_alt_charset_mode) {
 219             doPut(exit_alt_charset_mode);
 220             PreviousAttr &= ~A_ALTCHARSET;
 221         }
 222         if (PreviousAttr) {
 223             if (exit_attribute_mode) {
 224                 doPut(exit_attribute_mode);
 225             } else {
 226                 if (!SP_PARM || SP_PARM->_use_rmul) {
 227                     TurnOff(A_UNDERLINE, exit_underline_mode);
 228                 }
 229                 if (!SP_PARM || SP_PARM->_use_rmso) {
 230                     TurnOff(A_STANDOUT, exit_standout_mode);
 231                 }
 232             }
 233             PreviousAttr &= ALL_BUT_COLOR;
 234         }
 235
 236         SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
 237     } else if (set_attributes) {
 238         if (turn_on || turn_off) {
 239             TPUTS_TRACE("set_attributes");
 240             NCURSES_SP_NAME(tputs) (NCURSES_SP_ARGx
 241                                     tparm(set_attributes,
 242                                           (newmode & A_STANDOUT) != 0,
 243                                           (newmode & A_UNDERLINE) != 0,
 244                                           (newmode & A_REVERSE) != 0,
 245                                           (newmode & A_BLINK) != 0,
 246                                           (newmode & A_DIM) != 0,
 247                                           (newmode & A_BOLD) != 0,
 248                                           (newmode & A_INVIS) != 0,
 249                                           (newmode & A_PROTECT) != 0,
 250                                           (newmode & A_ALTCHARSET) != 0),
 251                                     1, outc);
 252             PreviousAttr &= ALL_BUT_COLOR;
 253         }
 254         SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
 255     } else {
 256
 257         TR(TRACE_ATTRS, ("turning %s off", _traceattr(turn_off)));
 258
 259         TurnOff(A_ALTCHARSET, exit_alt_charset_mode);
 260
 261         if (!SP_PARM || SP_PARM->_use_rmul) {
 262             TurnOff(A_UNDERLINE, exit_underline_mode);
 263         }
 264
 265         if (!SP_PARM || SP_PARM->_use_rmso) {
 266             TurnOff(A_STANDOUT, exit_standout_mode);
 267         }
 268
 269         if (turn_off && exit_attribute_mode) {
 270             doPut(exit_attribute_mode);
 271             turn_on |= (newmode & ALL_BUT_COLOR);
 272             PreviousAttr &= ALL_BUT_COLOR;
 273         }
 274         SetColorsIf((pair != 0) || fix_pair0, PreviousAttr);
 275
 276         TR(TRACE_ATTRS, ("turning %s on", _traceattr(turn_on)));
 277         /* *INDENT-OFF* */
 278         TurnOn(A_ALTCHARSET,    enter_alt_charset_mode);
 279         TurnOn(A_BLINK,         enter_blink_mode);
 280         TurnOn(A_BOLD,          enter_bold_mode);
 281         TurnOn(A_DIM,           enter_dim_mode);
 282         TurnOn(A_REVERSE,       enter_reverse_mode);
 283         TurnOn(A_STANDOUT,      enter_standout_mode);
 284         TurnOn(A_PROTECT,       enter_protected_mode);
 285         TurnOn(A_INVIS,         enter_secure_mode);
 286         TurnOn(A_UNDERLINE,     enter_underline_mode);
 287 #if defined(USE_WIDEC_SUPPORT)
 288         TurnOn(A_HORIZONTAL,    enter_horizontal_hl_mode);
 289         TurnOn(A_LEFT,          enter_left_hl_mode);
 290         TurnOn(A_LOW,           enter_low_hl_mode);
 291         TurnOn(A_RIGHT,         enter_right_hl_mode);
 292         TurnOn(A_TOP,           enter_top_hl_mode);
 293         TurnOn(A_VERTICAL,      enter_vertical_hl_mode);
 294 #endif
 295         /* *INDENT-ON* */
 296
 297     }
 298
 299     if (reverse)
 300         newmode |= A_REVERSE;
 301
 302     if (SP_PARM)
 303         SetAttr(SCREEN_ATTRS(SP_PARM), newmode);
 304     else
 305         PreviousAttr = newmode;
 306
 307     returnCode(OK);
 308 }
 309
 310 #if NCURSES_SP_FUNCS
 311 NCURSES_EXPORT(int)
 312 vidputs(chtype newmode, NCURSES_OUTC outc)
 313 {
 314     SetSafeOutcWrapper(outc);
 315     return NCURSES_SP_NAME(vidputs) (CURRENT_SCREEN,
 316                                      newmode,
 317                                      _nc_outc_wrapper);
 318 }
 319 #endif
 320
 321 NCURSES_EXPORT(int)
 322 NCURSES_SP_NAME(vidattr) (NCURSES_SP_DCLx chtype newmode)
 323 {
 324     T((T_CALLED("vidattr(%p,%s)"), (void *) SP_PARM, _traceattr(newmode)));
 325     returnCode(NCURSES_SP_NAME(vidputs) (NCURSES_SP_ARGx
 326                                          newmode,
 327                                          NCURSES_SP_NAME(_nc_outch)));
 328 }
 329
 330 #if NCURSES_SP_FUNCS
 331 NCURSES_EXPORT(int)
 332 vidattr(chtype newmode)
 333 {
 334     return NCURSES_SP_NAME(vidattr) (CURRENT_SCREEN, newmode);
 335 }
 336 #endif
 337
 338 NCURSES_EXPORT(chtype)
 339 NCURSES_SP_NAME(termattrs) (NCURSES_SP_DCL0)
 340 {
 341     chtype attrs = A_NORMAL;
 342
 343     T((T_CALLED("termattrs(%p)"), (void *) SP_PARM));
 344 #ifdef USE_TERM_DRIVER
 345     if (HasTerminal(SP_PARM))
 346         attrs = CallDriver(SP_PARM, conattr);
 347 #else
 348
 349     if (enter_alt_charset_mode)
 350         attrs |= A_ALTCHARSET;
 351
 352     if (enter_blink_mode)
 353         attrs |= A_BLINK;
 354
 355     if (enter_bold_mode)
 356         attrs |= A_BOLD;
 357
 358     if (enter_dim_mode)
 359         attrs |= A_DIM;
 360
 361     if (enter_reverse_mode)
 362         attrs |= A_REVERSE;
 363
 364     if (enter_standout_mode)
 365         attrs |= A_STANDOUT;
 366
 367     if (enter_protected_mode)
 368         attrs |= A_PROTECT;
 369
 370     if (enter_secure_mode)
 371         attrs |= A_INVIS;
 372
 373     if (enter_underline_mode)
 374         attrs |= A_UNDERLINE;
 375
 376     if (SP_PARM->_coloron)
 377         attrs |= A_COLOR;
 378
 379 #endif
 380     returnChtype(attrs);
 381 }
 382
 383 #if NCURSES_SP_FUNCS
 384 NCURSES_EXPORT(chtype)
 385 termattrs(void)
 386 {
 387     return NCURSES_SP_NAME(termattrs) (CURRENT_SCREEN);
 388 }
 389 #endif