--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/pdcurses/overlay.c Thu Jul 23 18:07:39 2015 +0300
@@ -0,0 +1,256 @@
+/* Public Domain Curses */
+
+#include <curspriv.h>
+
+RCSID("$Id: overlay.c,v 1.36 2008/07/14 12:35:23 wmcbrine Exp $")
+
+/*man-start**************************************************************
+
+ Name: overlay
+
+ Synopsis:
+ int overlay(const WINDOW *src_w, WINDOW *dst_w)
+ int overwrite(const WINDOW *src_w, WINDOW *dst_w)
+ int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
+ int src_tc, int dst_tr, int dst_tc, int dst_br,
+ int dst_bc, bool overlay)
+
+ Description:
+ overlay() and overwrite() copy all the text from src_w into
+ dst_w. The windows need not be the same size. Those characters
+ in the source window that intersect with the destination window
+ are copied, so that the characters appear in the same physical
+ position on the screen. The difference between the two functions
+ is that overlay() is non-destructive (blanks are not copied)
+ while overwrite() is destructive (blanks are copied).
+
+ copywin() is similar, but doesn't require that the two windows
+ overlap. The arguments src_tc and src_tr specify the top left
+ corner of the region to be copied. dst_tc, dst_tr, dst_br, and
+ dst_bc specify the region within the destination window to copy
+ to. The argument "overlay", if TRUE, indicates that the copy is
+ done non-destructively (as in overlay()); blanks in the source
+ window are not copied to the destination window. When overlay is
+ FALSE, blanks are copied.
+
+ Return Value:
+ All functions return OK on success and ERR on error.
+
+ Portability X/Open BSD SYS V
+ overlay Y Y Y
+ overwrite Y Y Y
+ copywin Y - 3.0
+
+**man-end****************************************************************/
+
+/* Thanks to Andreas Otte <venn@@uni-paderborn.de> for the
+ corrected overlay()/overwrite() behavior. */
+
+static int _copy_win(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
+ int src_tc, int src_br, int src_bc, int dst_tr,
+ int dst_tc, bool overlay)
+{
+ int col, line, y1, fc, *minchng, *maxchng;
+ chtype *w1ptr, *w2ptr;
+
+ int lc = 0;
+ int xdiff = src_bc - src_tc;
+ int ydiff = src_br - src_tr;
+
+ if (!src_w || !dst_w)
+ return ERR;
+
+ minchng = dst_w->_firstch;
+ maxchng = dst_w->_lastch;
+
+ for (y1 = 0; y1 < dst_tr; y1++)
+ {
+ minchng++;
+ maxchng++;
+ }
+
+ for (line = 0; line < ydiff; line++)
+ {
+ w1ptr = src_w->_y[line + src_tr] + src_tc;
+ w2ptr = dst_w->_y[line + dst_tr] + dst_tc;
+
+ fc = _NO_CHANGE;
+
+ for (col = 0; col < xdiff; col++)
+ {
+ if ((*w1ptr) != (*w2ptr) &&
+ !((*w1ptr & A_CHARTEXT) == ' ' && overlay))
+ {
+ *w2ptr = *w1ptr;
+
+ if (fc == _NO_CHANGE)
+ fc = col + dst_tc;
+
+ lc = col + dst_tc;
+ }
+
+ 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++;
+ }
+
+ return OK;
+}
+
+int overlay(const WINDOW *src_w, WINDOW *dst_w)
+{
+ int first_line, first_col, last_line, last_col;
+ int src_start_x, src_start_y, dst_start_x, dst_start_y;
+ int xdiff, ydiff;
+
+ PDC_LOG(("overlay() - called\n"));
+
+ if (!src_w || !dst_w)
+ return ERR;
+
+ first_col = max(dst_w->_begx, src_w->_begx);
+ first_line = max(dst_w->_begy, src_w->_begy);
+
+ last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
+ last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);
+
+ /* determine the overlapping region of the two windows in real
+ coordinates */
+
+ /* if no overlapping region, do nothing */
+
+ if ((last_col < first_col) || (last_line < first_line))
+ return OK;
+
+ /* size of overlapping region */
+
+ xdiff = last_col - first_col;
+ ydiff = last_line - first_line;
+
+ if (src_w->_begx <= dst_w->_begx)
+ {
+ src_start_x = dst_w->_begx - src_w->_begx;
+ dst_start_x = 0;
+ }
+ else
+ {
+ dst_start_x = src_w->_begx - dst_w->_begx;
+ src_start_x = 0;
+ }
+
+ if (src_w->_begy <= dst_w->_begy)
+ {
+ src_start_y = dst_w->_begy - src_w->_begy;
+ dst_start_y = 0;
+ }
+ else
+ {
+ dst_start_y = src_w->_begy - dst_w->_begy;
+ src_start_y = 0;
+ }
+
+ return _copy_win(src_w, dst_w, src_start_y, src_start_x,
+ src_start_y + ydiff, src_start_x + xdiff,
+ dst_start_y, dst_start_x, TRUE);
+}
+
+int overwrite(const WINDOW *src_w, WINDOW *dst_w)
+{
+ int first_line, first_col, last_line, last_col;
+ int src_start_x, src_start_y, dst_start_x, dst_start_y;
+ int xdiff, ydiff;
+
+ PDC_LOG(("overwrite() - called\n"));
+
+ if (!src_w || !dst_w)
+ return ERR;
+
+ first_col = max(dst_w->_begx, src_w->_begx);
+ first_line = max(dst_w->_begy, src_w->_begy);
+
+ last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
+ last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);
+
+ /* determine the overlapping region of the two windows in real
+ coordinates */
+
+ /* if no overlapping region, do nothing */
+
+ if ((last_col < first_col) || (last_line < first_line))
+ return OK;
+
+ /* size of overlapping region */
+
+ xdiff = last_col - first_col;
+ ydiff = last_line - first_line;
+
+ if (src_w->_begx <= dst_w->_begx)
+ {
+ src_start_x = dst_w->_begx - src_w->_begx;
+ dst_start_x = 0;
+ }
+ else
+ {
+ dst_start_x = src_w->_begx - dst_w->_begx;
+ src_start_x = 0;
+ }
+
+ if (src_w->_begy <= dst_w->_begy)
+ {
+ src_start_y = dst_w->_begy - src_w->_begy;
+ dst_start_y = 0;
+ }
+ else
+ {
+ dst_start_y = src_w->_begy - dst_w->_begy;
+ src_start_y = 0;
+ }
+
+ return _copy_win(src_w, dst_w, src_start_y, src_start_x,
+ src_start_y + ydiff, src_start_x + xdiff,
+ dst_start_y, dst_start_x, FALSE);
+}
+
+int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr, int src_tc,
+ int dst_tr, int dst_tc, int dst_br, int dst_bc, int overlay)
+{
+ int src_end_x, src_end_y;
+ int src_rows, src_cols, dst_rows, dst_cols;
+ int min_rows, min_cols;
+
+ PDC_LOG(("copywin() - called\n"));
+
+ if (!src_w || !dst_w || dst_w == curscr || dst_br > dst_w->_maxy
+ || dst_bc > dst_w->_maxx || dst_tr < 0 || dst_tc < 0)
+ return ERR;
+
+ src_rows = src_w->_maxy - src_tr;
+ src_cols = src_w->_maxx - src_tc;
+ dst_rows = dst_br - dst_tr + 1;
+ dst_cols = dst_bc - dst_tc + 1;
+
+ min_rows = min(src_rows, dst_rows);
+ min_cols = min(src_cols, dst_cols);
+
+ src_end_y = src_tr + min_rows;
+ src_end_x = src_tc + min_cols;
+
+ return _copy_win(src_w, dst_w, src_tr, src_tc, src_end_y, src_end_x,
+ dst_tr, dst_tc, overlay);
+}