minix/lib/libcurses/overlay.c

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2005-04-21 16:53:53 +02:00
/****************************************************************/
/* 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 (...mcvax!enea!infovax!bl) */
/****************************************************************/
/* 1.0: Release: 870515 */
/****************************************************************/
/* Modified to run under the MINIX operating system by Don Cope */
/* These changes are also released into the public domain. */
/* 900906 */
/****************************************************************/
#include <curses.h>
#include "curspriv.h"
/****************************************************************/
/* Overlay() overwrites 'win1' upon 'win2', with origins alig- */
/* Ned. Overlay is transparent; blanks from 'win1' are not */
/* Copied to 'win2'. */
/****************************************************************/
void overlay(win1, win2)
WINDOW *win1, *win2;
{
int *minchng;
int *maxchng;
int *w1ptr;
int *w2ptr;
int attrs;
int col;
int line;
int last_line;
int last_col;
last_col = min(win1->_maxx, win2->_maxx);
last_line = min(win1->_maxy, win2->_maxy);
attrs = win2->_attrs & ATR_MSK;
minchng = win2->_minchng;
maxchng = win2->_maxchng;
for (line = 0; line <= last_line; line++) {
register short fc, lc = 0;
w1ptr = win1->_line[line];
w2ptr = win2->_line[line];
fc = _NO_CHANGE;
for (col = 0; col <= last_col; col++) {
if ((*w1ptr & CHR_MSK) != ' ') {
*w2ptr = (*w1ptr & CHR_MSK) | attrs;
if (fc == _NO_CHANGE) fc = col;
lc = col;
}
w1ptr++;
w2ptr++;
}
if (*minchng == _NO_CHANGE) {
*minchng = fc;
*maxchng = lc;
} else if (fc != _NO_CHANGE) {
if (fc < *minchng) *minchng = fc;
if (lc > *maxchng) *maxchng = lc;
}
minchng++;
maxchng++;
} /* for */
} /* overlay */
/****************************************************************/
/* Overwrite() overwrites 'win1' upon 'win2', with origins */
/* Aligned. Overwrite is non-transparent; blanks from 'win1' */
/* Are copied to 'win2'. */
/****************************************************************/
void overwrite(win1, win2)
WINDOW *win1, *win2;
{
int *minchng;
int *maxchng;
int *w1ptr;
int *w2ptr;
int attrs;
int col;
int line;
int last_line;
int last_col;
last_col = min(win1->_maxx, win2->_maxx);
last_line = min(win1->_maxy, win2->_maxy);
attrs = win2->_attrs & ATR_MSK;
minchng = win2->_minchng;
maxchng = win2->_maxchng;
for (line = 0; line <= last_line; line++) {
register short fc, lc = 0;
w1ptr = win1->_line[line];
w2ptr = win2->_line[line];
fc = _NO_CHANGE;
for (col = 0; col <= last_col; col++) {
if ((*w1ptr & CHR_MSK) != (*w2ptr & CHR_MSK)) {
*w2ptr = (*w1ptr & CHR_MSK) | attrs;
if (fc == _NO_CHANGE) fc = col;
lc = col;
}
w1ptr++;
w2ptr++;
} /* for */
if (*minchng == _NO_CHANGE) {
*minchng = fc;
*maxchng = lc;
} else if (fc != _NO_CHANGE) {
if (fc < *minchng) *minchng = fc;
if (lc > *maxchng) *maxchng = lc;
}
minchng++;
maxchng++;
}
}