125 lines
3.3 KiB
C
125 lines
3.3 KiB
C
/****************************************************************/
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/* Overlay() and overwrite() functions of the PCcurses package */
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/* */
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/****************************************************************/
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/* This version of curses is based on ncurses, a curses version */
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/* Originally written by Pavel Curtis at Cornell University. */
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/* I have made substantial changes to make it run on IBM PC's, */
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/* And therefore consider myself free to make it public domain. */
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/* Bjorn Larsson (...mcvax!enea!infovax!bl) */
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/****************************************************************/
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/* 1.0: Release: 870515 */
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/****************************************************************/
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/* Modified to run under the MINIX operating system by Don Cope */
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/* These changes are also released into the public domain. */
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/* 900906 */
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/****************************************************************/
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#include <curses.h>
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#include "curspriv.h"
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/****************************************************************/
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/* Overlay() overwrites 'win1' upon 'win2', with origins alig- */
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/* Ned. Overlay is transparent; blanks from 'win1' are not */
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/* Copied to 'win2'. */
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/****************************************************************/
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void overlay(win1, win2)
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WINDOW *win1, *win2;
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{
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int *minchng;
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int *maxchng;
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int *w1ptr;
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int *w2ptr;
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int attrs;
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int col;
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int line;
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int last_line;
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int last_col;
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last_col = min(win1->_maxx, win2->_maxx);
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last_line = min(win1->_maxy, win2->_maxy);
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attrs = win2->_attrs & ATR_MSK;
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minchng = win2->_minchng;
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maxchng = win2->_maxchng;
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for (line = 0; line <= last_line; line++) {
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register short fc, lc = 0;
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w1ptr = win1->_line[line];
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w2ptr = win2->_line[line];
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fc = _NO_CHANGE;
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for (col = 0; col <= last_col; col++) {
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if ((*w1ptr & CHR_MSK) != ' ') {
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*w2ptr = (*w1ptr & CHR_MSK) | attrs;
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if (fc == _NO_CHANGE) fc = col;
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lc = col;
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}
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w1ptr++;
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w2ptr++;
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}
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if (*minchng == _NO_CHANGE) {
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*minchng = fc;
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*maxchng = lc;
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} else if (fc != _NO_CHANGE) {
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if (fc < *minchng) *minchng = fc;
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if (lc > *maxchng) *maxchng = lc;
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}
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minchng++;
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maxchng++;
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} /* for */
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} /* overlay */
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/****************************************************************/
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/* Overwrite() overwrites 'win1' upon 'win2', with origins */
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/* Aligned. Overwrite is non-transparent; blanks from 'win1' */
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/* Are copied to 'win2'. */
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/****************************************************************/
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void overwrite(win1, win2)
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WINDOW *win1, *win2;
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{
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int *minchng;
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int *maxchng;
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int *w1ptr;
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int *w2ptr;
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int attrs;
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int col;
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int line;
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int last_line;
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int last_col;
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last_col = min(win1->_maxx, win2->_maxx);
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last_line = min(win1->_maxy, win2->_maxy);
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attrs = win2->_attrs & ATR_MSK;
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minchng = win2->_minchng;
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maxchng = win2->_maxchng;
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for (line = 0; line <= last_line; line++) {
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register short fc, lc = 0;
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w1ptr = win1->_line[line];
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w2ptr = win2->_line[line];
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fc = _NO_CHANGE;
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for (col = 0; col <= last_col; col++) {
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if ((*w1ptr & CHR_MSK) != (*w2ptr & CHR_MSK)) {
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*w2ptr = (*w1ptr & CHR_MSK) | attrs;
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if (fc == _NO_CHANGE) fc = col;
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lc = col;
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}
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w1ptr++;
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w2ptr++;
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} /* for */
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if (*minchng == _NO_CHANGE) {
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*minchng = fc;
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*maxchng = lc;
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} else if (fc != _NO_CHANGE) {
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if (fc < *minchng) *minchng = fc;
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if (lc > *maxchng) *maxchng = lc;
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}
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minchng++;
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maxchng++;
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}
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}
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