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Diffstat (limited to 'Utilities/cmpdcurses/pdcurses/refresh.c')
| -rw-r--r-- | Utilities/cmpdcurses/pdcurses/refresh.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/Utilities/cmpdcurses/pdcurses/refresh.c b/Utilities/cmpdcurses/pdcurses/refresh.c new file mode 100644 index 0000000000..cc0a25d90b --- /dev/null +++ b/Utilities/cmpdcurses/pdcurses/refresh.c @@ -0,0 +1,279 @@ +/* PDCurses */ + +#include <curspriv.h> + +/*man-start************************************************************** + +refresh +------- + +### Synopsis + + int refresh(void); + int wrefresh(WINDOW *win); + int wnoutrefresh(WINDOW *win); + int doupdate(void); + int redrawwin(WINDOW *win); + int wredrawln(WINDOW *win, int beg_line, int num_lines); + +### Description + + wrefresh() copies the named window to the physical terminal screen, + taking into account what is already there in order to optimize cursor + movement. refresh() does the same, using stdscr. These routines must + be called to get any output on the terminal, as other routines only + manipulate data structures. Unless leaveok() has been enabled, the + physical cursor of the terminal is left at the location of the + window's cursor. + + wnoutrefresh() and doupdate() allow multiple updates with more + efficiency than wrefresh() alone. wrefresh() works by first calling + wnoutrefresh(), which copies the named window to the virtual screen. + It then calls doupdate(), which compares the virtual screen to the + physical screen and does the actual update. A series of calls to + wrefresh() will result in alternating calls to wnoutrefresh() and + doupdate(), causing several bursts of output to the screen. By first + calling wnoutrefresh() for each window, it is then possible to call + doupdate() only once. + + In PDCurses, redrawwin() is equivalent to touchwin(), and wredrawln() + is the same as touchline(). In some other curses implementations, + there's a subtle distinction, but it has no meaning in PDCurses. + +### Return Value + + All functions return OK on success and ERR on error. + +### Portability + X/Open ncurses NetBSD + refresh Y Y Y + wrefresh Y Y Y + wnoutrefresh Y Y Y + doupdate Y Y Y + redrawwin Y Y Y + wredrawln Y Y Y + +**man-end****************************************************************/ + +#include <string.h> + +int wnoutrefresh(WINDOW *win) +{ + int begy, begx; /* window's place on screen */ + int i, j; + + PDC_LOG(("wnoutrefresh() - called: win=%p\n", win)); + + if ( !win || (win->_flags & (_PAD|_SUBPAD)) ) + return ERR; + + begy = win->_begy; + begx = win->_begx; + + for (i = 0, j = begy; i < win->_maxy; i++, j++) + { + if (win->_firstch[i] != _NO_CHANGE) + { + chtype *src = win->_y[i]; + chtype *dest = curscr->_y[j] + begx; + + int first = win->_firstch[i]; /* first changed */ + int last = win->_lastch[i]; /* last changed */ + + /* ignore areas on the outside that are marked as changed, + but really aren't */ + + while (first <= last && src[first] == dest[first]) + first++; + + while (last >= first && src[last] == dest[last]) + last--; + + /* if any have really changed... */ + + if (first <= last) + { + memcpy(dest + first, src + first, + (last - first + 1) * sizeof(chtype)); + + first += begx; + last += begx; + + if (first < curscr->_firstch[j] || + curscr->_firstch[j] == _NO_CHANGE) + curscr->_firstch[j] = first; + + if (last > curscr->_lastch[j]) + curscr->_lastch[j] = last; + } + + win->_firstch[i] = _NO_CHANGE; /* updated now */ + } + + win->_lastch[i] = _NO_CHANGE; /* updated now */ + } + + if (win->_clear) + win->_clear = FALSE; + + if (!win->_leaveit) + { + curscr->_cury = win->_cury + begy; + curscr->_curx = win->_curx + begx; + } + + return OK; +} + +int doupdate(void) +{ + int y; + bool clearall; + + PDC_LOG(("doupdate() - called\n")); + + if (!SP || !curscr) + return ERR; + + if (isendwin()) /* coming back after endwin() called */ + { + reset_prog_mode(); + clearall = TRUE; + SP->alive = TRUE; /* so isendwin() result is correct */ + } + else + clearall = curscr->_clear; + + for (y = 0; y < SP->lines; y++) + { + PDC_LOG(("doupdate() - Transforming line %d of %d: %s\n", + y, SP->lines, (curscr->_firstch[y] != _NO_CHANGE) ? + "Yes" : "No")); + + if (clearall || curscr->_firstch[y] != _NO_CHANGE) + { + int first, last; + + chtype *src = curscr->_y[y]; + chtype *dest = SP->lastscr->_y[y]; + + if (clearall) + { + first = 0; + last = COLS - 1; + } + else + { + first = curscr->_firstch[y]; + last = curscr->_lastch[y]; + } + + while (first <= last) + { + int len = 0; + + /* build up a run of changed cells; if two runs are + separated by a single unchanged cell, ignore the + break */ + + if (clearall) + len = last - first + 1; + else + while (first + len <= last && + (src[first + len] != dest[first + len] || + (len && first + len < last && + src[first + len + 1] != dest[first + len + 1]) + ) + ) + len++; + + /* update the screen, and SP->lastscr */ + + if (len) + { + PDC_transform_line(y, first, len, src + first); + memcpy(dest + first, src + first, len * sizeof(chtype)); + first += len; + } + + /* skip over runs of unchanged cells */ + + while (first <= last && src[first] == dest[first]) + first++; + } + + curscr->_firstch[y] = _NO_CHANGE; + curscr->_lastch[y] = _NO_CHANGE; + } + } + + curscr->_clear = FALSE; + + if (SP->visibility) + PDC_gotoyx(curscr->_cury, curscr->_curx); + + SP->cursrow = curscr->_cury; + SP->curscol = curscr->_curx; + + PDC_doupdate(); + + return OK; +} + +int wrefresh(WINDOW *win) +{ + bool save_clear; + + PDC_LOG(("wrefresh() - called\n")); + + if ( !win || (win->_flags & (_PAD|_SUBPAD)) ) + return ERR; + + save_clear = win->_clear; + + if (win == curscr) + curscr->_clear = TRUE; + else + wnoutrefresh(win); + + if (save_clear && win->_maxy == SP->lines && win->_maxx == SP->cols) + curscr->_clear = TRUE; + + return doupdate(); +} + +int refresh(void) +{ + PDC_LOG(("refresh() - called\n")); + + return wrefresh(stdscr); +} + +int wredrawln(WINDOW *win, int start, int num) +{ + int i; + + PDC_LOG(("wredrawln() - called: win=%p start=%d num=%d\n", + win, start, num)); + + if (!win || start > win->_maxy || start + num > win->_maxy) + return ERR; + + for (i = start; i < start + num; i++) + { + win->_firstch[i] = 0; + win->_lastch[i] = win->_maxx - 1; + } + + return OK; +} + +int redrawwin(WINDOW *win) +{ + PDC_LOG(("redrawwin() - called: win=%p\n", win)); + + if (!win) + return ERR; + + return wredrawln(win, 0, win->_maxy); +} |