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overlay.c
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1989-12-08
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4KB
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148 lines
/****************************************************************/
/* 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 */
/* 1.2: Max limits off by 1. Fixed thanks to S. Creps: 881002 */
/* 1.3: MSC -W3, Turbo'C' -w -w-pro checkes: 881005 */
/****************************************************************/
#include <curses.h>
#include <curspriv.h>
char _curses_overlay_rcsid[] = "@(#)overlay.c v1.3 - 881005";
/****************************************************************/
/* 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) - 1;
last_line = min(win1->_maxy, win2->_maxy) - 1;
attrs = win2->_attrs & ATR_MSK;
minchng = win2->_minchng;
maxchng = win2->_maxchng;
for(line = 0; line <= last_line; line++)
{
register short fc, lc;
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;
} /* 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 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) - 1;
last_line = min(win1->_maxy, win2->_maxy) - 1;
attrs = win2->_attrs & ATR_MSK;
minchng = win2->_minchng;
maxchng = win2->_maxchng;
for(line = 0; line <= last_line; line++)
{
register short fc, lc;
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;
} /* 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 */