1 /**************************************************************************** 2 * Copyright (c) 1998-2006,2007 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 1.23 2007/04/07 17:13:52 tom Exp $") 44 45 static int 46 overlap(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 %ld, begx %ld, maxy %ld, maxx %ld", 60 (long) s->_begy, 61 (long) s->_begx, 62 (long) s->_maxy, 63 (long) s->_maxx)); 64 T(("dst : begy %ld, begx %ld, maxy %ld, maxx %ld", 65 (long) d->_begy, 66 (long) d->_begx, 67 (long) d->_maxy, 68 (long) d->_maxx)); 69 70 sx1 = s->_begx; 71 sy1 = s->_begy; 72 sx2 = sx1 + s->_maxx; 73 sy2 = sy1 + s->_maxy; 74 75 dx1 = d->_begx; 76 dy1 = d->_begy; 77 dx2 = dx1 + d->_maxx; 78 dy2 = dy1 + d->_maxy; 79 80 if (dx2 < sx1 || dx1 > sx2 || dy2 < sy1 || dy1 > sy2) { 81 returnCode(ERR); /* No intersection */ 82 } else { 83 sminrow = max(sy1, dy1) - sy1; 84 smincol = max(sx1, dx1) - sx1; 85 dminrow = max(sy1, dy1) - dy1; 86 dmincol = max(sx1, dx1) - dx1; 87 dmaxrow = min(sy2, dy2) - dy1; 88 dmaxcol = min(sx2, dx2) - dx1; 89 90 returnCode(copywin(s, d, 91 sminrow, smincol, 92 dminrow, dmincol, 93 dmaxrow, dmaxcol, 94 flag)); 95 } 96 } 97 } 98 99 /* 100 ** 101 ** overlay(win1, win2) 102 ** 103 ** 104 ** overlay() writes the overlapping area of win1 behind win2 105 ** on win2 non-destructively. 106 ** 107 **/ 108 109 NCURSES_EXPORT(int) 110 overlay(const WINDOW *win1, WINDOW *win2) 111 { 112 T((T_CALLED("overlay(%p,%p)"), win1, win2)); 113 returnCode(overlap(win1, win2, TRUE)); 114 } 115 116 /* 117 ** 118 ** overwrite(win1, win2) 119 ** 120 ** 121 ** overwrite() writes the overlapping area of win1 behind win2 122 ** on win2 destructively. 123 ** 124 **/ 125 126 NCURSES_EXPORT(int) 127 overwrite(const WINDOW *win1, WINDOW *win2) 128 { 129 T((T_CALLED("overwrite(%p,%p)"), win1, win2)); 130 returnCode(overlap(win1, win2, FALSE)); 131 } 132 133 NCURSES_EXPORT(int) 134 copywin(const WINDOW *src, WINDOW *dst, 135 int sminrow, int smincol, 136 int dminrow, int dmincol, 137 int dmaxrow, int dmaxcol, 138 int over) 139 { 140 int sx, sy, dx, dy; 141 bool touched; 142 attr_t bk; 143 attr_t mask; 144 145 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 146 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over)); 147 148 if (!src || !dst) 149 returnCode(ERR); 150 151 bk = AttrOf(dst->_nc_bkgd); 152 mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0); 153 154 /* make sure rectangle exists in source */ 155 if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) || 156 (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) { 157 returnCode(ERR); 158 } 159 160 T(("rectangle exists in source")); 161 162 /* make sure rectangle fits in destination */ 163 if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) { 164 returnCode(ERR); 165 } 166 167 T(("rectangle fits in destination")); 168 169 for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) { 170 touched = FALSE; 171 for (dx = dmincol, sx = smincol; dx <= dmaxcol; sx++, dx++) { 172 if (over) { 173 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) && 174 (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx]))) { 175 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 176 SetAttr(dst->_line[dy].text[dx], 177 (AttrOf(src->_line[sy].text[sx]) & mask) | bk); 178 touched = TRUE; 179 } 180 } else { 181 if (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx])) { 182 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 183 touched = TRUE; 184 } 185 } 186 } 187 if (touched) { 188 touchline(dst, dminrow, (dmaxrow - dminrow + 1)); 189 } 190 } 191 T(("finished copywin")); 192 returnCode(OK); 193 } 194