1/**************************************************************************** 2 * Copyright (c) 1998-2001,2002 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29/**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 ****************************************************************************/ 33 34/* 35** lib_overlay.c 36** 37** The routines overlay(), copywin(), and overwrite(). 38** 39*/ 40 41#include <curses.priv.h> 42 43MODULE_ID("$Id: lib_overlay.c,v 1.21 2002/09/21 23:03:32 tom Exp $") 44 45static int 46overlap(const WINDOW *const s, WINDOW *const d, int const flag) 47{ 48 int sx1, sy1, sx2, sy2; 49 int dx1, dy1, dx2, dy2; 50 int sminrow, smincol; 51 int dminrow, dmincol; 52 int dmaxrow, dmaxcol; 53 54 T((T_CALLED("overlap(%p,%p,%d)"), s, d, flag)); 55 56 if (s == 0 || d == 0) { 57 returnCode(ERR); 58 } else { 59 T(("src : begy %d, begx %d, maxy %d, maxx %d", 60 s->_begy, s->_begx, s->_maxy, s->_maxx)); 61 T(("dst : begy %d, begx %d, maxy %d, maxx %d", 62 d->_begy, d->_begx, d->_maxy, d->_maxx)); 63 64 sx1 = s->_begx; 65 sy1 = s->_begy; 66 sx2 = sx1 + s->_maxx; 67 sy2 = sy1 + s->_maxy; 68 69 dx1 = d->_begx; 70 dy1 = d->_begy; 71 dx2 = dx1 + d->_maxx; 72 dy2 = dy1 + d->_maxy; 73 74 if (dx2 < sx1 || dx1 > sx2 || dy2 < sy1 || dy1 > sy2) { 75 returnCode(ERR); /* No intersection */ 76 } else { 77 sminrow = max(sy1, dy1) - sy1; 78 smincol = max(sx1, dx1) - sx1; 79 dminrow = max(sy1, dy1) - dy1; 80 dmincol = max(sx1, dx1) - dx1; 81 dmaxrow = min(sy2, dy2) - dy1; 82 dmaxcol = min(sx2, dx2) - dx1; 83 84 returnCode(copywin(s, d, 85 sminrow, smincol, 86 dminrow, dmincol, 87 dmaxrow, dmaxcol, 88 flag)); 89 } 90 } 91} 92 93/* 94** 95** overlay(win1, win2) 96** 97** 98** overlay() writes the overlapping area of win1 behind win2 99** on win2 non-destructively. 100** 101**/ 102 103NCURSES_EXPORT(int) 104overlay(const WINDOW *win1, WINDOW *win2) 105{ 106 T((T_CALLED("overlay(%p,%p)"), win1, win2)); 107 returnCode(overlap(win1, win2, TRUE)); 108} 109 110/* 111** 112** overwrite(win1, win2) 113** 114** 115** overwrite() writes the overlapping area of win1 behind win2 116** on win2 destructively. 117** 118**/ 119 120NCURSES_EXPORT(int) 121overwrite(const WINDOW *win1, WINDOW *win2) 122{ 123 T((T_CALLED("overwrite(%p,%p)"), win1, win2)); 124 returnCode(overlap(win1, win2, FALSE)); 125} 126 127NCURSES_EXPORT(int) 128copywin(const WINDOW *src, WINDOW *dst, 129 int sminrow, int smincol, 130 int dminrow, int dmincol, 131 int dmaxrow, int dmaxcol, 132 int over) 133{ 134 int sx, sy, dx, dy; 135 bool touched; 136 attr_t bk = AttrOf(dst->_nc_bkgd); 137 attr_t mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0); 138 139 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 140 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over)); 141 142 if (!src || !dst) 143 returnCode(ERR); 144 145 /* make sure rectangle exists in source */ 146 if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) || 147 (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) { 148 returnCode(ERR); 149 } 150 151 T(("rectangle exists in source")); 152 153 /* make sure rectangle fits in destination */ 154 if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) { 155 returnCode(ERR); 156 } 157 158 T(("rectangle fits in destination")); 159 160 for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) { 161 touched = FALSE; 162 for (dx = dmincol, sx = smincol; dx <= dmaxcol; sx++, dx++) { 163 if (over) { 164 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) && 165 (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx]))) { 166 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 167 SetAttr(dst->_line[dy].text[dx], 168 (AttrOf(src->_line[sy].text[sx]) & mask) | bk); 169 touched = TRUE; 170 } 171 } else { 172 if (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx])) { 173 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 174 touched = TRUE; 175 } 176 } 177 } 178 if (touched) { 179 touchline(dst, dminrow, (dmaxrow - dminrow + 1)); 180 } 181 } 182 T(("finished copywin")); 183 returnCode(OK); 184} 185