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/* Public Domain Curses */
#include <curspriv.h>
RCSID("$Id: bkgd.c,v 1.39 2008/07/13 16:08:18 wmcbrine Exp $")
/*man-start**************************************************************
Name: bkgd
Synopsis:
int bkgd(chtype ch);
void bkgdset(chtype ch);
chtype getbkgd(WINDOW *win);
int wbkgd(WINDOW *win, chtype ch);
void wbkgdset(WINDOW *win, chtype ch);
int bkgrnd(const cchar_t *wch);
void bkgrndset(const cchar_t *wch);
int getbkgrnd(cchar_t *wch);
int wbkgrnd(WINDOW *win, const cchar_t *wch);
void wbkgrndset(WINDOW *win, const cchar_t *wch);
int wgetbkgrnd(WINDOW *win, cchar_t *wch);
Description:
bkgdset() and wbkgdset() manipulate the background of a window.
The background is a chtype consisting of any combination of
attributes and a character; it is combined with each chtype
added or inserted to the window by waddch() or winsch(). Only
the attribute part is used to set the background of non-blank
characters, while both character and attributes are used for
blank positions.
bkgd() and wbkgd() not only change the background, but apply it
immediately to every cell in the window.
The attributes that are defined with the attrset()/attron() set
of functions take precedence over the background attributes if
there is a conflict (e.g., different color pairs).
Return Value:
bkgd() and wbkgd() return OK, unless the window is NULL, in
which case they return ERR.
Portability X/Open BSD SYS V
bkgd Y - 4.0
bkgdset Y - 4.0
getbkgd Y
wbkgd Y - 4.0
wbkgdset Y - 4.0
bkgrnd Y
bkgrndset Y
getbkgrnd Y
wbkgrnd Y
wbkgrndset Y
wgetbkgrnd Y
**man-end****************************************************************/
int wbkgd(WINDOW *win, chtype ch)
{
int x, y;
chtype oldcolr, oldch, newcolr, newch, colr, attr;
chtype oldattr = 0, newattr = 0;
chtype *winptr;
PDC_LOG(("wbkgd() - called\n"));
if (!win)
return ERR;
if (win->_bkgd == ch)
return OK;
oldcolr = win->_bkgd & A_COLOR;
if (oldcolr)
oldattr = (win->_bkgd & A_ATTRIBUTES) ^ oldcolr;
oldch = win->_bkgd & A_CHARTEXT;
wbkgdset(win, ch);
newcolr = win->_bkgd & A_COLOR;
if (newcolr)
newattr = (win->_bkgd & A_ATTRIBUTES) ^ newcolr;
newch = win->_bkgd & A_CHARTEXT;
/* what follows is what seems to occur in the System V
implementation of this routine */
for (y = 0; y < win->_maxy; y++)
{
for (x = 0; x < win->_maxx; x++)
{
winptr = win->_y[y] + x;
ch = *winptr;
/* determine the colors and attributes of the character read
from the window */
colr = ch & A_COLOR;
attr = ch & (A_ATTRIBUTES ^ A_COLOR);
/* if the color is the same as the old background color,
then make it the new background color, otherwise leave it */
if (colr == oldcolr)
colr = newcolr;
/* remove any attributes (non color) from the character that
were part of the old background, then combine the
remaining ones with the new background */
attr ^= oldattr;
attr |= newattr;
/* change character if it is there because it was the old
background character */
ch &= A_CHARTEXT;
if (ch == oldch)
ch = newch;
ch |= (attr | colr);
*winptr = ch;
}
}
touchwin(win);
PDC_sync(win);
return OK;
}
int bkgd(chtype ch)
{
PDC_LOG(("bkgd() - called\n"));
return wbkgd(stdscr, ch);
}
void wbkgdset(WINDOW *win, chtype ch)
{
PDC_LOG(("wbkgdset() - called\n"));
if (win)
{
if (!(ch & A_CHARTEXT))
ch |= ' ';
win->_bkgd = ch;
}
}
void bkgdset(chtype ch)
{
PDC_LOG(("bkgdset() - called\n"));
wbkgdset(stdscr, ch);
}
chtype getbkgd(WINDOW *win)
{
PDC_LOG(("getbkgd() - called\n"));
return win ? win->_bkgd : (chtype)ERR;
}
#ifdef PDC_WIDE
int wbkgrnd(WINDOW *win, const cchar_t *wch)
{
PDC_LOG(("wbkgrnd() - called\n"));
return wch ? wbkgd(win, *wch) : ERR;
}
int bkgrnd(const cchar_t *wch)
{
PDC_LOG(("bkgrnd() - called\n"));
return wbkgrnd(stdscr, wch);
}
void wbkgrndset(WINDOW *win, const cchar_t *wch)
{
PDC_LOG(("wbkgdset() - called\n"));
if (wch)
wbkgdset(win, *wch);
}
void bkgrndset(const cchar_t *wch)
{
PDC_LOG(("bkgrndset() - called\n"));
wbkgrndset(stdscr, wch);
}
int wgetbkgrnd(WINDOW *win, cchar_t *wch)
{
PDC_LOG(("wgetbkgrnd() - called\n"));
if (!win || !wch)
return ERR;
*wch = win->_bkgd;
return OK;
}
int getbkgrnd(cchar_t *wch)
{
PDC_LOG(("getbkgrnd() - called\n"));
return wgetbkgrnd(stdscr, wch);
}
#endif
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