release/src/router/libncurses/ncurses/base/lib_pad.c

   1 /****************************************************************************
   2  * Copyright (c) 1998-2009,2010 Free Software Foundation, Inc.              *
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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  * lib_pad.c
  38  * newpad       -- create a new pad
  39  * pnoutrefresh -- refresh a pad, no update
  40  * pechochar    -- add a char to a pad and refresh
  41  */
  42
  43 #include <curses.priv.h>
  44
  45 MODULE_ID("$Id: lib_pad.c,v 1.46 2010/04/24 23:50:45 tom Exp $")
  46
  47 NCURSES_EXPORT(WINDOW *)
  48 NCURSES_SP_NAME(newpad) (NCURSES_SP_DCLx int l, int c)
  49 {
  50     WINDOW *win;
  51     NCURSES_CH_T *ptr;
  52     int i;
  53
  54     T((T_CALLED("newpad(%p,%d, %d)"), (void *) SP_PARM, l, c));
  55
  56     if (l <= 0 || c <= 0)
  57         returnWin(0);
  58
  59     win = NCURSES_SP_NAME(_nc_makenew) (NCURSES_SP_ARGx l, c, 0, 0, _ISPAD);
  60     if (win == NULL)
  61         returnWin(0);
  62
  63     for (i = 0; i < l; i++) {
  64         if_USE_SCROLL_HINTS(win->_line[i].oldindex = _NEWINDEX);
  65         if ((win->_line[i].text = typeCalloc(NCURSES_CH_T, ((size_t) c))) == 0) {
  66             (void) _nc_freewin(win);
  67             returnWin(0);
  68         }
  69         for (ptr = win->_line[i].text; ptr < win->_line[i].text + c; ptr++)
  70             SetChar(*ptr, BLANK_TEXT, BLANK_ATTR);
  71     }
  72
  73     returnWin(win);
  74 }
  75
  76 #if NCURSES_SP_FUNCS
  77 NCURSES_EXPORT(WINDOW *)
  78 newpad(int l, int c)
  79 {
  80     return NCURSES_SP_NAME(newpad) (CURRENT_SCREEN, l, c);
  81 }
  82 #endif
  83
  84 NCURSES_EXPORT(WINDOW *)
  85 subpad(WINDOW *orig, int l, int c, int begy, int begx)
  86 {
  87     WINDOW *win = (WINDOW *) 0;
  88
  89     T((T_CALLED("subpad(%d, %d)"), l, c));
  90
  91     if (orig) {
  92         if (!(orig->_flags & _ISPAD)
  93             || ((win = derwin(orig, l, c, begy, begx)) == NULL))
  94             returnWin(0);
  95     }
  96     returnWin(win);
  97 }
  98
  99 NCURSES_EXPORT(int)
 100 prefresh(WINDOW *win,
 101          int pminrow,
 102          int pmincol,
 103          int sminrow,
 104          int smincol,
 105          int smaxrow,
 106          int smaxcol)
 107 {
 108 #if NCURSES_SP_FUNCS
 109     SCREEN *sp = _nc_screen_of(win);
 110 #endif
 111
 112     T((T_CALLED("prefresh()")));
 113     if (pnoutrefresh(win, pminrow, pmincol, sminrow, smincol, smaxrow,
 114                      smaxcol) != ERR
 115         && NCURSES_SP_NAME(doupdate) (NCURSES_SP_ARG) != ERR) {
 116         returnCode(OK);
 117     }
 118     returnCode(ERR);
 119 }
 120
 121 NCURSES_EXPORT(int)
 122 pnoutrefresh(WINDOW *win,
 123              int pminrow,
 124              int pmincol,
 125              int sminrow,
 126              int smincol,
 127              int smaxrow,
 128              int smaxcol)
 129 {
 130     int i, j;
 131     int m, n;
 132     int pmaxrow;
 133     int pmaxcol;
 134     SCREEN *sp;
 135
 136 #if USE_SCROLL_HINTS
 137     const int my_len = 2;       /* parameterize the threshold for hardscroll */
 138     NCURSES_SIZE_T displaced;
 139     bool wide;
 140 #endif
 141
 142     T((T_CALLED("pnoutrefresh(%p, %d, %d, %d, %d, %d, %d)"),
 143        (void *) win, pminrow, pmincol, sminrow, smincol, smaxrow, smaxcol));
 144
 145     if (win == 0)
 146         returnCode(ERR);
 147
 148     if (!(win->_flags & _ISPAD))
 149         returnCode(ERR);
 150
 151     sp = _nc_screen_of(win);
 152
 153     /* negative values are interpreted as zero */
 154     if (pminrow < 0)
 155         pminrow = 0;
 156     if (pmincol < 0)
 157         pmincol = 0;
 158     if (sminrow < 0)
 159         sminrow = 0;
 160     if (smincol < 0)
 161         smincol = 0;
 162
 163     pmaxrow = pminrow + smaxrow - sminrow;
 164     pmaxcol = pmincol + smaxcol - smincol;
 165
 166     T((" pminrow + smaxrow - sminrow %ld, win->_maxy %ld",
 167        (long) pmaxrow, (long) win->_maxy));
 168     T((" pmincol + smaxcol - smincol %ld, win->_maxx %ld",
 169        (long) pmaxcol, (long) win->_maxx));
 170
 171     /*
 172      * Trim the caller's screen size back to the actual limits.
 173      */
 174     if (pmaxrow > win->_maxy) {
 175         smaxrow -= (pmaxrow - win->_maxy);
 176         pmaxrow = pminrow + smaxrow - sminrow;
 177     }
 178     if (pmaxcol > win->_maxx) {
 179         smaxcol -= (pmaxcol - win->_maxx);
 180         pmaxcol = pmincol + smaxcol - smincol;
 181     }
 182
 183     if (smaxrow >= screen_lines(sp)
 184         || smaxcol >= screen_columns(sp)
 185         || sminrow > smaxrow
 186         || smincol > smaxcol)
 187         returnCode(ERR);
 188
 189     T(("pad being refreshed"));
 190
 191 #if USE_SCROLL_HINTS
 192     if (win->_pad._pad_y >= 0) {
 193         displaced = pminrow - win->_pad._pad_y
 194             - (sminrow - win->_pad._pad_top);
 195         T(("pad being shifted by %d line(s)", displaced));
 196     } else
 197         displaced = 0;
 198 #endif
 199
 200     /*
 201      * For pure efficiency, we'd want to transfer scrolling information
 202      * from the pad to newscr whenever the window is wide enough that
 203      * its update will dominate the cost of the update for the horizontal
 204      * band of newscr that it occupies.  Unfortunately, this threshold
 205      * tends to be complex to estimate, and in any case scrolling the
 206      * whole band and rewriting the parts outside win's image would look
 207      * really ugly.  So.  What we do is consider the pad "wide" if it
 208      * either (a) occupies the whole width of newscr, or (b) occupies
 209      * all but at most one column on either vertical edge of the screen
 210      * (this caters to fussy people who put boxes around full-screen
 211      * windows).  Note that changing this formula will not break any code,
 212      * merely change the costs of various update cases.
 213      */
 214 #if USE_SCROLL_HINTS
 215     wide = (smincol < my_len && smaxcol > (NewScreen(sp)->_maxx - my_len));
 216 #endif
 217
 218     for (i = pminrow, m = sminrow + win->_yoffset;
 219          i <= pmaxrow && m <= NewScreen(sp)->_maxy;
 220          i++, m++) {
 221         register struct ldat *nline = &NewScreen(sp)->_line[m];
 222         register struct ldat *oline = &win->_line[i];
 223         for (j = pmincol, n = smincol; j <= pmaxcol; j++, n++) {
 224             NCURSES_CH_T ch = oline->text[j];
 225 #if USE_WIDEC_SUPPORT
 226             /*
 227              * Special case for leftmost character of the displayed area.
 228              * Only half of a double-width character may be visible.
 229              */
 230             if (j == pmincol
 231                 && j > 0
 232                 && isWidecExt(ch)) {
 233                 SetChar(ch, L(' '), AttrOf(oline->text[j - 1]));
 234             }
 235 #endif
 236             if (!CharEq(ch, nline->text[n])) {
 237                 nline->text[n] = ch;
 238                 CHANGED_CELL(nline, n);
 239             }
 240         }
 241
 242 #if USE_SCROLL_HINTS
 243         if (wide) {
 244             int nind = m + displaced;
 245             if (oline->oldindex < 0
 246                 || nind < sminrow
 247                 || nind > smaxrow) {
 248                 nind = _NEWINDEX;
 249             } else if (displaced) {
 250                 register struct ldat *pline = &CurScreen(sp)->_line[nind];
 251                 for (j = 0; j <= my_len; j++) {
 252                     int k = NewScreen(sp)->_maxx - j;
 253                     if (pline->text[j] != nline->text[j]
 254                         || pline->text[k] != nline->text[k]) {
 255                         nind = _NEWINDEX;
 256                         break;
 257                     }
 258                 }
 259             }
 260
 261             nline->oldindex = nind;
 262         }
 263 #endif /* USE_SCROLL_HINTS */
 264         oline->firstchar = oline->lastchar = _NOCHANGE;
 265         if_USE_SCROLL_HINTS(oline->oldindex = i);
 266     }
 267
 268     /*
 269      * Clean up debris from scrolling or resizing the pad, so we do not
 270      * accidentally pick up the index value during the next call to this
 271      * procedure.  The only rows that should have an index value are those
 272      * that are displayed during this cycle.
 273      */
 274 #if USE_SCROLL_HINTS
 275     for (i = pminrow - 1; (i >= 0) && (win->_line[i].oldindex >= 0); i--)
 276         win->_line[i].oldindex = _NEWINDEX;
 277     for (i = pmaxrow + 1; (i <= win->_maxy)
 278          && (win->_line[i].oldindex >= 0); i++)
 279         win->_line[i].oldindex = _NEWINDEX;
 280 #endif
 281
 282     win->_begx = (NCURSES_SIZE_T) smincol;
 283     win->_begy = (NCURSES_SIZE_T) sminrow;
 284
 285     if (win->_clear) {
 286         win->_clear = FALSE;
 287         NewScreen(sp)->_clear = TRUE;
 288     }
 289
 290     /*
 291      * Use the pad's current position, if it will be visible.
 292      * If not, don't do anything; it's not an error.
 293      */
 294     if (win->_leaveok == FALSE
 295         && win->_cury >= pminrow
 296         && win->_curx >= pmincol
 297         && win->_cury <= pmaxrow
 298         && win->_curx <= pmaxcol) {
 299         NewScreen(sp)->_cury = (NCURSES_SIZE_T) (win->_cury - pminrow
 300                                                  + win->_begy + win->_yoffset);
 301         NewScreen(sp)->_curx = (NCURSES_SIZE_T) (win->_curx - pmincol
 302                                                  + win->_begx);
 303     }
 304     NewScreen(sp)->_leaveok = win->_leaveok;
 305     win->_flags &= ~_HASMOVED;
 306
 307     /*
 308      * Update our cache of the line-numbers that we displayed from the pad.
 309      * We will use this on subsequent calls to this function to derive
 310      * values to stuff into 'oldindex[]' -- for scrolling optimization.
 311      */
 312     win->_pad._pad_y = (NCURSES_SIZE_T) pminrow;
 313     win->_pad._pad_x = (NCURSES_SIZE_T) pmincol;
 314     win->_pad._pad_top = (NCURSES_SIZE_T) sminrow;
 315     win->_pad._pad_left = (NCURSES_SIZE_T) smincol;
 316     win->_pad._pad_bottom = (NCURSES_SIZE_T) smaxrow;
 317     win->_pad._pad_right = (NCURSES_SIZE_T) smaxcol;
 318
 319     returnCode(OK);
 320 }
 321
 322 NCURSES_EXPORT(int)
 323 pechochar(WINDOW *pad, const chtype ch)
 324 {
 325     T((T_CALLED("pechochar(%p, %s)"), (void *) pad, _tracechtype(ch)));
 326
 327     if (pad == 0)
 328         returnCode(ERR);
 329
 330     if (!(pad->_flags & _ISPAD))
 331         returnCode(wechochar(pad, ch));
 332
 333     waddch(pad, ch);
 334     prefresh(pad, pad->_pad._pad_y,
 335              pad->_pad._pad_x,
 336              pad->_pad._pad_top,
 337              pad->_pad._pad_left,
 338              pad->_pad._pad_bottom,
 339              pad->_pad._pad_right);
 340
 341     returnCode(OK);
 342 }