/**************************************************************************** * apps/graphics/pdcurses/pdc_overlay.c * Public Domain Curses * RCSID("$Id: overlay.c,v 1.36 2008/07/14 12:35:23 wmcbrine Exp $") * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * Adapted by: Gregory Nutt * * Adapted from the original public domain pdcurses by Gregory Nutt and * released as part of NuttX under the 3-clause BSD license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * 3. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************/ /* 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 * * * Thanks to Andreas Otte for the * corrected overlay()/overwrite() behavior. */ /**************************************************************************** * Included Files ****************************************************************************/ #include "curspriv.h" /**************************************************************************** * Private Functions ****************************************************************************/ 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; int line; int y1; int fc; int *minchng; int *maxchng; chtype *w1ptr; chtype *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; } /**************************************************************************** * Public Functions ****************************************************************************/ int overlay(const WINDOW * src_w, WINDOW * dst_w) { int first_line; int first_col; int last_line; int last_col; int src_start_x; int src_start_y; int dst_start_x; int dst_start_y; int xdiff; int 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; int first_col; int last_line; int last_col; int src_start_x; int src_start_y; int dst_start_x; int dst_start_y; int xdiff; int 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; int src_end_y; int src_rows; int src_cols; int dst_rows; int dst_cols; int min_rows; int 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); }