1 /* $OpenBSD: lib_overlay.c,v 1.4 2023/10/17 09:52:08 nicm Exp $ */ 2 3 /**************************************************************************** 4 * Copyright 2020 Thomas E. Dickey * 5 * Copyright 1998-2013,2016 Free Software Foundation, Inc. * 6 * * 7 * Permission is hereby granted, free of charge, to any person obtaining a * 8 * copy of this software and associated documentation files (the * 9 * "Software"), to deal in the Software without restriction, including * 10 * without limitation the rights to use, copy, modify, merge, publish, * 11 * distribute, distribute with modifications, sublicense, and/or sell * 12 * copies of the Software, and to permit persons to whom the Software is * 13 * furnished to do so, subject to the following conditions: * 14 * * 15 * The above copyright notice and this permission notice shall be included * 16 * in all copies or substantial portions of the Software. * 17 * * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 21 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 24 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 25 * * 26 * Except as contained in this notice, the name(s) of the above copyright * 27 * holders shall not be used in advertising or otherwise to promote the * 28 * sale, use or other dealings in this Software without prior written * 29 * authorization. * 30 ****************************************************************************/ 31 32 /**************************************************************************** 33 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 34 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 35 ****************************************************************************/ 36 37 /* 38 ** lib_overlay.c 39 ** 40 ** The routines overlay(), copywin(), and overwrite(). 41 ** 42 */ 43 44 #include <curses.priv.h> 45 46 MODULE_ID("$Id: lib_overlay.c,v 1.4 2023/10/17 09:52:08 nicm Exp $") 47 48 static int 49 overlap(const WINDOW *const src, WINDOW *const dst, int const flag) 50 { 51 int rc = ERR; 52 53 T((T_CALLED("overlap(%p,%p,%d)"), (const void *) src, (void *) dst, flag)); 54 55 if (src != 0 && dst != 0) { 56 int sx1, sy1, sx2, sy2; 57 int dx1, dy1, dx2, dy2; 58 59 _nc_lock_global(curses); 60 61 T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld", 62 (long) src->_begy, 63 (long) src->_begx, 64 (long) src->_maxy, 65 (long) src->_maxx)); 66 T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld", 67 (long) dst->_begy, 68 (long) dst->_begx, 69 (long) dst->_maxy, 70 (long) dst->_maxx)); 71 72 sx1 = src->_begx; 73 sy1 = src->_begy; 74 sx2 = sx1 + src->_maxx; 75 sy2 = sy1 + src->_maxy; 76 77 dx1 = dst->_begx; 78 dy1 = dst->_begy; 79 dx2 = dx1 + dst->_maxx; 80 dy2 = dy1 + dst->_maxy; 81 82 if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) { 83 int sminrow = max(sy1, dy1) - sy1; 84 int smincol = max(sx1, dx1) - sx1; 85 int dminrow = max(sy1, dy1) - dy1; 86 int dmincol = max(sx1, dx1) - dx1; 87 int dmaxrow = min(sy2, dy2) - dy1; 88 int dmaxcol = min(sx2, dx2) - dx1; 89 90 rc = copywin(src, dst, 91 sminrow, smincol, 92 dminrow, dmincol, 93 dmaxrow, dmaxcol, 94 flag); 95 } 96 _nc_unlock_global(curses); 97 } 98 returnCode(rc); 99 } 100 101 /* 102 ** 103 ** overlay(win1, win2) 104 ** 105 ** 106 ** overlay() writes the overlapping area of win1 behind win2 107 ** on win2 non-destructively. 108 ** 109 **/ 110 111 NCURSES_EXPORT(int) 112 overlay(const WINDOW *win1, WINDOW *win2) 113 { 114 T((T_CALLED("overlay(%p,%p)"), (const void *) win1, (void *) win2)); 115 returnCode(overlap(win1, win2, TRUE)); 116 } 117 118 /* 119 ** 120 ** overwrite(win1, win2) 121 ** 122 ** 123 ** overwrite() writes the overlapping area of win1 behind win2 124 ** on win2 destructively. 125 ** 126 **/ 127 128 NCURSES_EXPORT(int) 129 overwrite(const WINDOW *win1, WINDOW *win2) 130 { 131 T((T_CALLED("overwrite(%p,%p)"), (const void *) win1, (void *) win2)); 132 returnCode(overlap(win1, win2, FALSE)); 133 } 134 135 NCURSES_EXPORT(int) 136 copywin(const WINDOW *src, WINDOW *dst, 137 int sminrow, int smincol, 138 int dminrow, int dmincol, 139 int dmaxrow, int dmaxcol, 140 int over) 141 { 142 int rc = ERR; 143 144 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 145 (const void *) src, 146 (void *) dst, 147 sminrow, smincol, 148 dminrow, dmincol, 149 dmaxrow, dmaxcol, over)); 150 151 if (src != 0 152 && dst != 0 153 && dmaxrow >= dminrow 154 && dmaxcol >= dmincol) { 155 attr_t bk; 156 attr_t mask; 157 158 _nc_lock_global(curses); 159 160 bk = AttrOf(dst->_nc_bkgd); 161 mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0); 162 163 /* make sure rectangle exists in source */ 164 if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) && 165 (smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) { 166 167 T(("rectangle exists in source")); 168 169 /* make sure rectangle fits in destination */ 170 if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) { 171 int sx, sy, dx, dy; 172 bool copied = FALSE; 173 174 T(("rectangle fits in destination")); 175 176 for (dy = dminrow, sy = sminrow; 177 dy <= dmaxrow; 178 sy++, dy++) { 179 bool touched; 180 181 if (dy < 0 || sy < 0) 182 continue; 183 184 touched = FALSE; 185 for (dx = dmincol, sx = smincol; 186 dx <= dmaxcol; 187 sx++, dx++) { 188 189 if (dx < 0 || sx < 0) 190 continue; 191 copied = TRUE; 192 193 if (over) { 194 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) && 195 (!CharEq(dst->_line[dy].text[dx], 196 src->_line[sy].text[sx]))) { 197 dst->_line[dy].text[dx] = 198 src->_line[sy].text[sx]; 199 SetAttr(dst->_line[dy].text[dx], 200 ((AttrOf(src->_line[sy].text[sx]) & 201 mask) | bk)); 202 touched = TRUE; 203 } 204 } else { 205 if (!CharEq(dst->_line[dy].text[dx], 206 src->_line[sy].text[sx])) { 207 dst->_line[dy].text[dx] = 208 src->_line[sy].text[sx]; 209 touched = TRUE; 210 } 211 } 212 } 213 if (touched) { 214 touchline(dst, dminrow, (dmaxrow - dminrow + 1)); 215 } 216 } 217 T(("finished copywin")); 218 if (copied) 219 rc = OK; 220 } 221 } 222 _nc_unlock_global(curses); 223 } 224 returnCode(rc); 225 } 226