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Diffstat (limited to 'lib/libcurses/lib_overlay.c')
| -rw-r--r-- | lib/libcurses/lib_overlay.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/lib/libcurses/lib_overlay.c b/lib/libcurses/lib_overlay.c new file mode 100644 index 00000000000..867c2e178d5 --- /dev/null +++ b/lib/libcurses/lib_overlay.c @@ -0,0 +1,135 @@ + +/*************************************************************************** +* COPYRIGHT NOTICE * +**************************************************************************** +* ncurses is copyright (C) 1992-1995 * +* Zeyd M. Ben-Halim * +* zmbenhal@netcom.com * +* Eric S. Raymond * +* esr@snark.thyrsus.com * +* * +* Permission is hereby granted to reproduce and distribute ncurses * +* by any means and for any fee, whether alone or as part of a * +* larger distribution, in source or in binary form, PROVIDED * +* this notice is included with any such distribution, and is not * +* removed from any of its header files. Mention of ncurses in any * +* applications linked with it is highly appreciated. * +* * +* ncurses comes AS IS with no warranty, implied or expressed. * +* * +***************************************************************************/ + + +/* +** lib_overlay.c +** +** The routines overlay(), copywin(), and overwrite(). +** +*/ + +#include "curses.priv.h" + +static void overlap(const WINDOW *const s, WINDOW *const d, int const flag) +{ +int sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol; + + T(("overlap : sby %d, sbx %d, smy %d, smx %d, dby %d, dbx %d, dmy %d, dmx %d", + s->_begy, s->_begx, s->_maxy, s->_maxx, + d->_begy, d->_begx, d->_maxy, d->_maxx)); + sminrow = max(s->_begy, d->_begy) - s->_begy; + smincol = max(s->_begx, d->_begx) - s->_begx; + dminrow = max(s->_begy, d->_begy) - d->_begy; + dmincol = max(s->_begx, d->_begx) - d->_begx; + dmaxrow = min(s->_maxy+s->_begy, d->_maxy+d->_begy) - d->_begy; + dmaxcol = min(s->_maxx+s->_begx, d->_maxx+d->_begx) - d->_begx; + + copywin(s, d, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, flag); +} + +/* +** +** overlay(win1, win2) +** +** +** overlay() writes the overlapping area of win1 behind win2 +** on win2 non-destructively. +** +**/ + +int overlay(const WINDOW *win1, WINDOW *win2) +{ + overlap(win1, win2, TRUE); + return OK; +} + +/* +** +** overwrite(win1, win2) +** +** +** overwrite() writes the overlapping area of win1 behind win2 +** on win2 destructively. +** +**/ + +int overwrite(const WINDOW *win1, WINDOW *win2) +{ + overlap(win1, win2, FALSE); + return OK; +} + +int copywin(const WINDOW *src, WINDOW *dst, + int sminrow, int smincol, + int dminrow, int dmincol, int dmaxrow, int dmaxcol, + int over) +{ +int sx, sy, dx, dy; +int touched; + + T(("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)", + src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over)); + + /* make sure rectangle exists in source */ + if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) || + (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) { + return ERR; + } + + T(("rectangle exists in source")); + + /* make sure rectangle fits in destination */ + if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) { + return ERR; + } + + T(("rectangle fits in destination")); + + for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) { + touched=0; + for(dx=dmincol, sx=smincol; dx <= dmaxcol; sx++, dx++) + { + if (over) + { + if (((src->_line[sy].text[sx] & A_CHARTEXT)!=' ') && + (dst->_line[dy].text[dx]!=src->_line[sy].text[sx])) + { + dst->_line[dy].text[dx] = src->_line[sy].text[sx]; + touched=1; + } + } + else { + if (dst->_line[dy].text[dx] != src->_line[sy].text[sx]) + { + dst->_line[dy].text[dx] = src->_line[sy].text[sx]; + touched=1; + } + } + } + if (touched) + { + touchline(dst,0,getmaxy(dst)); + } + } + T(("finished copywin")); + return OK; +} |