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- /****************************************************************/
- /* Overlay() and overwrite() functions of the PCcurses package */
- /* */
- /****************************************************************/
- /* This version of curses is based on ncurses, a curses version */
- /* originally written by Pavel Curtis at Cornell University. */
- /* I have made substantial changes to make it run on IBM PC's, */
- /* and therefore consider myself free to make it public domain. */
- /* Bjorn Larsson (bl@infovox.se) */
- /****************************************************************/
- /* 1.4: Overlaying window will not line up with over- */
- /* layed window's origin, but at it's 'own' origin */
- /* relative to the overlayed's origin. Use of short */
- /* wherever possible. Portability improvements: 900114 */
- /* 1.3: MSC -W3, Turbo'C' -w -w-pro checks: 881005 */
- /* 1.2: Max limits off by 1. Fixed thanks to S. Creps: 881002 */
- /* 1.0: Release: 870515 */
- /****************************************************************/
-
- #include <curses.h>
- #include <curspriv.h>
-
- char _curses_overlay_rcsid[] = "@(#)overlay.c v.1.4 - 900114";
-
- /****************************************************************/
- /* Overlay() overwrites 'win1' upon 'win2', with 'win1' appea- */
- /* ring in 'win2' at it own origin relative to 'win2's origin. */
- /* This is a departure, but a desirable one, from the initial */
- /* definition of this function. Overlay is transparent; blanks */
- /* from 'win1' are not copied to 'win2'. */
- /****************************************************************/
-
- void overlay(win1, win2)
- WINDOW *win1, *win2;
- {
- short *minchng;
- short *maxchng;
- short *w1ptr;
- short *w2ptr;
- short attrs;
- short col;
- short line;
- short last_line;
- short last_col;
-
- last_col = min(win1->_maxx + win1->_begx, win2->_maxx) - 1;
- last_line = min(win1->_maxy + win1->_begy, win2->_maxy) - 1;
- attrs = win2->_attrs & ATR_MSK;
- minchng = win2->_minchng + win1->_begy;
- maxchng = win2->_maxchng + win1->_begy;
-
- for(line = win1->_begy; line <= last_line; line++)
- {
- register short fc, lc;
-
- w1ptr = win1->_line[line - win1->_begy];
- w2ptr = win2->_line[line] + win1->_begx;
- fc = _NO_CHANGE;
-
- for(col = win1->_begx; col <= last_col; col++)
- {
- if ((*w1ptr & CHR_MSK) != ' ')
- {
- *w2ptr = (*w1ptr & CHR_MSK) | attrs;
- if (fc == _NO_CHANGE)
- fc = col;
- lc = col;
- } /* if */
- w1ptr++;
- w2ptr++;
- } /* for */
-
- if (*minchng == _NO_CHANGE)
- {
- *minchng = fc;
- *maxchng = lc;
- } /* if */
- else
- if (fc != _NO_CHANGE)
- {
- if (fc < *minchng)
- *minchng = fc;
- if (lc > *maxchng)
- *maxchng = lc;
- } /* else if */
- minchng++;
- maxchng++;
- } /* for */
- } /* overlay */
-
- /****************************************************************/
- /* Overwrite() overwrites 'win1' upon 'win2', with 'win1' ap- */
- /* pearing in 'win2' at it own origin relative to 'win2's ori- */
- /* gin. This is a departure, but a desirable one, from the */
- /* initial definition of this function. Overwrite is non-trans- */
- /* parent; blanks from 'win1' are copied to 'win2'. */
- /****************************************************************/
-
- void overwrite(win1, win2)
- WINDOW *win1, *win2;
- {
- short *minchng;
- short *maxchng;
- short *w1ptr;
- short *w2ptr;
- short attrs;
- short col;
- short line;
- short last_line;
- short last_col;
-
- last_col = min(win1->_maxx + win1->_begx, win2->_maxx) - 1;
- last_line = min(win1->_maxy + win1->_begy, win2->_maxy) - 1;
- attrs = win2->_attrs & ATR_MSK;
- minchng = win2->_minchng + win1->_begy;
- maxchng = win2->_maxchng + win1->_begy;
-
- for(line = win1->_begy; line <= last_line; line++)
- {
- register short fc, lc;
-
- w1ptr = win1->_line[line - win1->_begy];
- w2ptr = win2->_line[line] + win1->_begx;
- fc = _NO_CHANGE;
-
- for(col = win1->_begx; col <= last_col; col++)
- {
- if ((*w1ptr & CHR_MSK) != (*w2ptr & CHR_MSK))
- {
- *w2ptr = (*w1ptr & CHR_MSK) | attrs;
- if (fc == _NO_CHANGE)
- fc = col;
- lc = col;
- } /* if */
- w1ptr++;
- w2ptr++;
- } /* for */
-
- if (*minchng == _NO_CHANGE)
- {
- *minchng = fc;
- *maxchng = lc;
- } /* if */
- else
- if (fc != _NO_CHANGE)
- {
- if (fc < *minchng)
- *minchng = fc;
- if (lc > *maxchng)
- *maxchng = lc;
- } /* else if */
- minchng++;
- maxchng++;
- } /* for */
- } /* overwrite */
-