1 /**************************************************************************** 2 * Copyright (c) 1998 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 /* 36 ** lib_overlay.c 37 ** 38 ** The routines overlay(), copywin(), and overwrite(). 39 ** 40 */ 41 42 #include <curses.priv.h> 43 44 MODULE_ID("$Id: lib_overlay.c,v 1.12 1998/02/11 12:13:59 tom Exp $") 45 46 static int 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 int overlay(const WINDOW *win1, WINDOW *win2) 80 { 81 T((T_CALLED("overlay(%p,%p)"), win1, win2)); 82 returnCode(overlap(win1, win2, TRUE)); 83 } 84 85 /* 86 ** 87 ** overwrite(win1, win2) 88 ** 89 ** 90 ** overwrite() writes the overlapping area of win1 behind win2 91 ** on win2 destructively. 92 ** 93 **/ 94 95 int overwrite(const WINDOW *win1, WINDOW *win2) 96 { 97 T((T_CALLED("overwrite(%p,%p)"), win1, win2)); 98 returnCode(overlap(win1, win2, FALSE)); 99 } 100 101 int copywin(const WINDOW *src, WINDOW *dst, 102 int sminrow, int smincol, 103 int dminrow, int dmincol, int dmaxrow, int dmaxcol, 104 int over) 105 { 106 int sx, sy, dx, dy; 107 bool touched; 108 chtype bk = AttrOf(dst->_bkgd); 109 chtype mask = ~(chtype)((bk&A_COLOR) ? A_COLOR : 0); 110 111 T((T_CALLED("copywin(%p, %p, %d, %d, %d, %d, %d, %d, %d)"), 112 src, dst, sminrow, smincol, dminrow, dmincol, dmaxrow, dmaxcol, over)); 113 114 if (!src || !dst) 115 returnCode(ERR); 116 117 /* make sure rectangle exists in source */ 118 if ((sminrow + dmaxrow - dminrow) > (src->_maxy + 1) || 119 (smincol + dmaxcol - dmincol) > (src->_maxx + 1)) { 120 returnCode(ERR); 121 } 122 123 T(("rectangle exists in source")); 124 125 /* make sure rectangle fits in destination */ 126 if (dmaxrow > dst->_maxy || dmaxcol > dst->_maxx) { 127 returnCode(ERR); 128 } 129 130 T(("rectangle fits in destination")); 131 132 for (dy = dminrow, sy = sminrow; dy <= dmaxrow; sy++, dy++) { 133 touched = FALSE; 134 for(dx=dmincol, sx=smincol; dx <= dmaxcol; sx++, dx++) 135 { 136 if (over) 137 { 138 if ((TextOf(src->_line[sy].text[sx]) != ' ') && 139 (dst->_line[dy].text[dx]!=src->_line[sy].text[sx])) 140 { 141 dst->_line[dy].text[dx] = 142 (src->_line[sy].text[sx] & mask) | bk; 143 touched = TRUE; 144 } 145 } 146 else { 147 if (dst->_line[dy].text[dx] != src->_line[sy].text[sx]) 148 { 149 dst->_line[dy].text[dx] = src->_line[sy].text[sx]; 150 touched = TRUE; 151 } 152 } 153 } 154 if (touched) 155 { 156 touchline(dst,0,getmaxy(dst)); 157 } 158 } 159 T(("finished copywin")); 160 returnCode(OK); 161 } 162