ncurses/base/lib_bkgd.c

   1 /****************************************************************************
   2  * Copyright (c) 1998,2001-2002 Free Software Foundation, Inc.              *
   3  *                                                                          *
   4  * Permission is hereby granted, free of charge, to any person obtaining a  *
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   9  * copies of the Software, and to permit persons to whom the Software is    *
  10  * furnished to do so, subject to the following conditions:                 *
  11  *                                                                          *
  12  * The above copyright notice and this permission notice shall be included  *
  13  * in all copies or substantial portions of the Software.                   *
  14  *                                                                          *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  16  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  18  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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  21  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
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  23  * Except as contained in this notice, the name(s) of the above copyright   *
  24  * holders shall not be used in advertising or otherwise to promote the     *
  25  * sale, use or other dealings in this Software without prior written       *
  26  * authorization.                                                           *
  27  ****************************************************************************/
  28
  29 /****************************************************************************
  30  *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
  31  *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
  32  ****************************************************************************/
  33
  34 #include <curses.priv.h>
  35
  36 MODULE_ID("$Id: lib_bkgd.c,v 1.29 2002/09/22 20:30:32 tom Exp $")
  37
  38 /*
  39  * Set the window's background information.
  40  */
  41 #if USE_WIDEC_SUPPORT
  42 NCURSES_EXPORT(void)
  43 #else
  44 static inline void
  45 #endif
  46 wbkgrndset(WINDOW *win, const ARG_CH_T ch)
  47 {
  48     T((T_CALLED("wbkgdset(%p,%s)"), win, _tracech_t(ch)));
  49
  50     if (win) {
  51         attr_t off = AttrOf(win->_nc_bkgd);
  52         attr_t on = AttrOf(CHDEREF(ch));
  53
  54         toggle_attr_off(win->_attrs, off);
  55         toggle_attr_on(win->_attrs, on);
  56
  57         if (CharOf(CHDEREF(ch)) == L('\0'))
  58             SetChar(win->_nc_bkgd, BLANK_TEXT, AttrOf(CHDEREF(ch)));
  59         else
  60             win->_nc_bkgd = CHDEREF(ch);
  61 #if USE_WIDEC_SUPPORT
  62         /*
  63          * If we're compiled for wide-character support, _bkgrnd is the
  64          * preferred location for the background information since it stores
  65          * more than _bkgd.  Update _bkgd each time we modify _bkgrnd, so the
  66          * macro getbkgd() will work.
  67          */
  68         {
  69             cchar_t wch;
  70             int tmp;
  71
  72             wgetbkgrnd(win, &wch);
  73             tmp = wctob(CharOf(wch));
  74
  75             win->_bkgd = ((tmp == EOF) ? ' ' : (chtype) tmp) | AttrOf(wch);
  76         }
  77 #endif
  78     }
  79     returnVoid;
  80 }
  81
  82 NCURSES_EXPORT(void)
  83 wbkgdset(WINDOW *win, chtype ch)
  84 {
  85     NCURSES_CH_T wch;
  86     SetChar2(wch, ch);
  87     wbkgrndset(win, CHREF(wch));
  88 }
  89
  90 /*
  91  * Set the window's background information and apply it to each cell.
  92  */
  93 #if USE_WIDEC_SUPPORT
  94 NCURSES_EXPORT(int)
  95 #else
  96 static inline int
  97 #undef wbkgrnd
  98 #endif
  99 wbkgrnd(WINDOW *win, const ARG_CH_T ch)
 100 {
 101     int code = ERR;
 102     int x, y;
 103     NCURSES_CH_T new_bkgd = CHDEREF(ch);
 104
 105     T((T_CALLED("wbkgd(%p,%s)"), win, _tracech_t(ch)));
 106
 107     if (win) {
 108         NCURSES_CH_T old_bkgrnd;
 109         wgetbkgrnd(win, &old_bkgrnd);
 110
 111         wbkgrndset(win, CHREF(new_bkgd));
 112         wattrset(win, AttrOf(win->_nc_bkgd));
 113
 114         for (y = 0; y <= win->_maxy; y++) {
 115             for (x = 0; x <= win->_maxx; x++) {
 116                 if (CharEq(win->_line[y].text[x], old_bkgrnd))
 117                     win->_line[y].text[x] = win->_nc_bkgd;
 118                 else {
 119                     NCURSES_CH_T wch = win->_line[y].text[x];
 120                     RemAttr(wch, (~A_ALTCHARSET));
 121                     win->_line[y].text[x] = _nc_render(win, wch);
 122                 }
 123             }
 124         }
 125         touchwin(win);
 126         _nc_synchook(win);
 127         code = OK;
 128     }
 129     returnCode(code);
 130 }
 131
 132 NCURSES_EXPORT(int)
 133 wbkgd(WINDOW *win, chtype ch)
 134 {
 135     NCURSES_CH_T wch;
 136     SetChar2(wch, ch);
 137     return wbkgrnd(win, CHREF(wch));
 138 }