1 /**************************************************************************** 2 * Copyright (c) 1998-2009,2013 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 43 MODULE_ID("$Id: lib_overlay.c,v 1.31 2013/04/06 23:47:13 tom Exp $") 44 45 static int 46 overlap(const WINDOW *const src, WINDOW *const dst, int const flag) 47 { 48 int rc = ERR; 49 int sx1, sy1, sx2, sy2; 50 int dx1, dy1, dx2, dy2; 51 int sminrow, smincol; 52 int dminrow, dmincol; 53 int dmaxrow, dmaxcol; 54 55 T((T_CALLED("overlap(%p,%p,%d)"), (const void *) src, (void *) dst, flag)); 56 57 if (src != 0 && dst != 0) { 58 _nc_lock_global(curses); 59 60 T(("src : begy %ld, begx %ld, maxy %ld, maxx %ld", 61 (long) src->_begy, 62 (long) src->_begx, 63 (long) src->_maxy, 64 (long) src->_maxx)); 65 T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld", 66 (long) dst->_begy, 67 (long) dst->_begx, 68 (long) dst->_maxy, 69 (long) dst->_maxx)); 70 71 sx1 = src->_begx; 72 sy1 = src->_begy; 73 sx2 = sx1 + src->_maxx; 74 sy2 = sy1 + src->_maxy; 75 76 dx1 = dst->_begx; 77 dy1 = dst->_begy; 78 dx2 = dx1 + dst->_maxx; 79 dy2 = dy1 + dst->_maxy; 80 81 if (dx2 >= sx1 && dx1 <= sx2 && dy2 >= sy1 && dy1 <= sy2) { 82 sminrow = max(sy1, dy1) - sy1; 83 smincol = max(sx1, dx1) - sx1; 84 dminrow = max(sy1, dy1) - dy1; 85 dmincol = max(sx1, dx1) - dx1; 86 dmaxrow = min(sy2, dy2) - dy1; 87 dmaxcol = min(sx2, dx2) - dx1; 88 89 rc = copywin(src, dst, 90 sminrow, smincol, 91 dminrow, dmincol, 92 dmaxrow, dmaxcol, 93 flag); 94 } 95 _nc_unlock_global(curses); 96 } 97 returnCode(rc); 98 } 99 100 /* 101 ** 102 ** overlay(win1, win2) 103 ** 104 ** 105 ** overlay() writes the overlapping area of win1 behind win2 106 ** on win2 non-destructively. 107 ** 108 **/ 109 110 NCURSES_EXPORT(int) 111 overlay(const WINDOW *win1, WINDOW *win2) 112 { 113 T((T_CALLED("overlay(%p,%p)"), (const void *) win1, (void *) win2)); 114 returnCode(overlap(win1, win2, TRUE)); 115 } 116 117 /* 118 ** 119 ** overwrite(win1, win2) 120 ** 121 ** 122 ** overwrite() writes the overlapping area of win1 behind win2 123 ** on win2 destructively. 124 ** 125 **/ 126 127 NCURSES_EXPORT(int) 128 overwrite(const WINDOW *win1, WINDOW *win2) 129 { 130 T((T_CALLED("overwrite(%p,%p)"), (const void *) win1, (void *) win2)); 131 returnCode(overlap(win1, win2, FALSE)); 132 } 133 134 NCURSES_EXPORT(int) 135 copywin(const WINDOW *src, WINDOW *dst, 136 int sminrow, int smincol, 137 int dminrow, int dmincol, 138 int dmaxrow, int dmaxcol, 139 int over) 140 { 141 int rc = ERR; 142 int sx, sy, dx, dy; 143 bool touched; 144 attr_t bk; 145 attr_t mask; 146 147 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 148 (const void *) src, 149 (void *) dst, 150 sminrow, smincol, 151 dminrow, dmincol, 152 dmaxrow, dmaxcol, over)); 153 154 if (src != 0 155 && dst != 0 156 && dmaxrow >= dminrow 157 && dmaxcol >= dmincol) { 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 bool copied = FALSE; 167 168 T(("rectangle exists in source")); 169 170 /* make sure rectangle fits in destination */ 171 if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) { 172 173 T(("rectangle fits in destination")); 174 175 for (dy = dminrow, sy = sminrow; 176 dy <= dmaxrow; 177 sy++, dy++) { 178 179 if (dy < 0 || sy < 0) 180 continue; 181 182 touched = FALSE; 183 for (dx = dmincol, sx = smincol; 184 dx <= dmaxcol; 185 sx++, dx++) { 186 187 if (dx < 0 || sx < 0) 188 continue; 189 copied = TRUE; 190 191 if (over) { 192 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) && 193 (!CharEq(dst->_line[dy].text[dx], 194 src->_line[sy].text[sx]))) { 195 dst->_line[dy].text[dx] = 196 src->_line[sy].text[sx]; 197 SetAttr(dst->_line[dy].text[dx], 198 ((AttrOf(src->_line[sy].text[sx]) & 199 mask) | bk)); 200 touched = TRUE; 201 } 202 } else { 203 if (!CharEq(dst->_line[dy].text[dx], 204 src->_line[sy].text[sx])) { 205 dst->_line[dy].text[dx] = 206 src->_line[sy].text[sx]; 207 touched = TRUE; 208 } 209 } 210 } 211 if (touched) { 212 touchline(dst, dminrow, (dmaxrow - dminrow + 1)); 213 } 214 } 215 T(("finished copywin")); 216 if (copied) 217 rc = OK; 218 } 219 } 220 _nc_unlock_global(curses); 221 } 222 returnCode(rc); 223 } 224