1 /**************************************************************************** 2 * Copyright (c) 1998,2000,2001 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 1.20 2001/12/19 01:06:37 tom Exp $") 44 45 static int 46 overlap(const WINDOW *const s, WINDOW *const d, int const flag) 47 { 48 int sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol; 49 50 T(("overlap : sby %d, sbx %d, smy %d, smx %d, dby %d, dbx %d, dmy %d, dmx %d", 51 s->_begy, s->_begx, s->_maxy, s->_maxx, 52 d->_begy, d->_begx, d->_maxy, d->_maxx)); 53 54 if (!s || !d) 55 returnCode(ERR); 56 57 sminrow = max(s->_begy, d->_begy) - s->_begy; 58 smincol = max(s->_begx, d->_begx) - s->_begx; 59 dminrow = max(s->_begy, d->_begy) - d->_begy; 60 dmincol = max(s->_begx, d->_begx) - d->_begx; 61 dmaxrow = min(s->_maxy + s->_begy, d->_maxy + d->_begy) - d->_begy; 62 dmaxcol = min(s->_maxx + s->_begx, d->_maxx + d->_begx) - d->_begx; 63 64 return (copywin(s, d, 65 sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, 66 flag)); 67 } 68 69 /* 70 ** 71 ** overlay(win1, win2) 72 ** 73 ** 74 ** overlay() writes the overlapping area of win1 behind win2 75 ** on win2 non-destructively. 76 ** 77 **/ 78 79 NCURSES_EXPORT(int) 80 overlay(const WINDOW *win1, WINDOW *win2) 81 { 82 T((T_CALLED("overlay(%p,%p)"), win1, win2)); 83 returnCode(overlap(win1, win2, TRUE)); 84 } 85 86 /* 87 ** 88 ** overwrite(win1, win2) 89 ** 90 ** 91 ** overwrite() writes the overlapping area of win1 behind win2 92 ** on win2 destructively. 93 ** 94 **/ 95 96 NCURSES_EXPORT(int) 97 overwrite(const WINDOW *win1, WINDOW *win2) 98 { 99 T((T_CALLED("overwrite(%p,%p)"), win1, win2)); 100 returnCode(overlap(win1, win2, FALSE)); 101 } 102 103 NCURSES_EXPORT(int) 104 copywin 105 (const WINDOW *src, WINDOW *dst, 106 int sminrow, int smincol, 107 int dminrow, int dmincol, int dmaxrow, int dmaxcol, 108 int over) 109 { 110 int sx, sy, dx, dy; 111 bool touched; 112 attr_t bk = AttrOf(dst->_nc_bkgd); 113 attr_t mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0); 114 115 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 116 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over)); 117 118 if (!src || !dst) 119 returnCode(ERR); 120 121 /* make sure rectangle exists in source */ 122 if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) || 123 (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) { 124 returnCode(ERR); 125 } 126 127 T(("rectangle exists in source")); 128 129 /* make sure rectangle fits in destination */ 130 if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) { 131 returnCode(ERR); 132 } 133 134 T(("rectangle fits in destination")); 135 136 for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) { 137 touched = FALSE; 138 for (dx = dmincol, sx = smincol; dx <= dmaxcol; sx++, dx++) { 139 if (over) { 140 if ((CharOf(src->_line[sy].text[sx]) != L(' ')) && 141 (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx]))) { 142 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 143 SetAttr(dst->_line[dy].text[dx], 144 (AttrOf(src->_line[sy].text[sx]) & mask) | bk); 145 touched = TRUE; 146 } 147 } else { 148 if (!CharEq(dst->_line[dy].text[dx], src->_line[sy].text[sx])) { 149 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 150 touched = TRUE; 151 } 152 } 153 } 154 if (touched) { 155 touchline(dst, 0, getmaxy(dst)); 156 } 157 } 158 T(("finished copywin")); 159 returnCode(OK); 160 } 161