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touchoverlap(), from NetBSD, by way of Karthik Kumar Viswanathan.

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This commit is contained in:
William McBrine
2019-05-11 08:39:29 -04:00
parent 610d0eda37
commit e449e65597
2 changed files with 42 additions and 0 deletions
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4
curses.h
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@@ -1340,6 +1340,10 @@ PDCEX int sb_get_vert(int *, int *, int *);
PDCEX int sb_refresh(void);
#endif
/* NetBSD */
PDCEX int touchoverlap(const WINDOW *, WINDOW *);
/*** Functions defined as macros ***/
/* getch() and ungetch() conflict with some DOS libraries */

38
pdcurses/touch.c
View File

@@ -16,6 +16,8 @@ touch
bool is_linetouched(WINDOW *win, int line);
bool is_wintouched(WINDOW *win);
int touchoverlap(const WINDOW *win1, WINDOW *win2);
### Description
touchwin() and touchline() throw away all information about
@@ -40,6 +42,9 @@ touch
is_wintouched() returns TRUE if the specified window
has been changed since the last call to wrefresh().
touchoverlap(win1, win2) marks the portion of win2 which overlaps
with win1 as modified.
### Return Value
All functions return OK on success and ERR on error except
@@ -53,6 +58,7 @@ touch
wtouchln Y Y Y
is_linetouched Y - 4.0
is_wintouched Y - 4.0
touchoverlap - Y -
**man-end****************************************************************/
@@ -161,3 +167,35 @@ bool is_wintouched(WINDOW *win)
return FALSE;
}
int touchoverlap(const WINDOW *win1, WINDOW *win2)
{
int y, endy, endx, starty, startx;
PDC_LOG(("touchoverlap() - called: win1=%p win2=%p\n", win1, win2));
if (!win1 || !win2)
return ERR;
starty = max(win1->_begy, win2->_begy);
startx = max(win1->_begx, win2->_begx);
endy = min(win1->_maxy + win1->_begy, win2->_maxy + win2->_begy);
endx = min(win1->_maxx + win1->_begx, win2->_maxx + win2->_begx);
if (starty >= endy || startx >= endx)
return OK;
starty -= win2->_begy;
startx -= win2->_begx;
endy -= win2->_begy;
endx -= win2->_begx;
endx -= 1;
for (y = starty; y < endy; y++)
{
win2->_firstch[y] = startx;
win2->_lastch[y] = endx;
}
return OK;
}