lib_overlay.c revision 262629 
1314564Sdim/****************************************************************************
2254721Semaste * Copyright (c) 1998-2008,2009 Free Software Foundation, Inc.              *
3254721Semaste *                                                                          *
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10288943Sdim * furnished to do so, subject to the following conditions:                 *
11254721Semaste *                                                                          *
12314564Sdim * The above copyright notice and this permission notice shall be included  *
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14254721Semaste *                                                                          *
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22314564Sdim *                                                                          *
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27314564Sdim ****************************************************************************/
28314564Sdim
29314564Sdim/****************************************************************************
30314564Sdim *  Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995               *
31314564Sdim *     and: Eric S. Raymond <esr@snark.thyrsus.com>                         *
32254721Semaste ****************************************************************************/
33254721Semaste
34344779Sdim/*
35314564Sdim**	lib_overlay.c
36314564Sdim**
37254721Semaste**	The routines overlay(), copywin(), and overwrite().
38**
39*/
40
41#include <curses.priv.h>
42
43MODULE_ID("$Id: lib_overlay.c,v 1.29 2009/10/24 23:21:31 tom Exp $")
44
45static int
46overlap(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
110NCURSES_EXPORT(int)
111overlay(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
127NCURSES_EXPORT(int)
128overwrite(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
134NCURSES_EXPORT(int)
135copywin(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 && dst) {
155	_nc_lock_global(curses);
156
157	bk = AttrOf(dst->_nc_bkgd);
158	mask = ~(attr_t) ((bk & A_COLOR) ? A_COLOR : 0);
159
160	/* make sure rectangle exists in source */
161	if ((sminrow + dmaxrow - dminrow) <= (src->_maxy + 1) &&
162	    (smincol + dmaxcol - dmincol) <= (src->_maxx + 1)) {
163
164	    T(("rectangle exists in source"));
165
166	    /* make sure rectangle fits in destination */
167	    if (dmaxrow <= dst->_maxy && dmaxcol <= dst->_maxx) {
168
169		T(("rectangle fits in destination"));
170
171		for (dy = dminrow, sy = sminrow;
172		     dy <= dmaxrow;
173		     sy++, dy++) {
174
175		    touched = FALSE;
176		    for (dx = dmincol, sx = smincol;
177			 dx <= dmaxcol;
178			 sx++, dx++) {
179			if (over) {
180			    if ((CharOf(src->_line[sy].text[sx]) != L(' ')) &&
181				(!CharEq(dst->_line[dy].text[dx],
182					 src->_line[sy].text[sx]))) {
183				dst->_line[dy].text[dx] =
184				    src->_line[sy].text[sx];
185				SetAttr(dst->_line[dy].text[dx],
186					((AttrOf(src->_line[sy].text[sx]) &
187					  mask) | bk));
188				touched = TRUE;
189			    }
190			} else {
191			    if (!CharEq(dst->_line[dy].text[dx],
192					src->_line[sy].text[sx])) {
193				dst->_line[dy].text[dx] =
194				    src->_line[sy].text[sx];
195				touched = TRUE;
196			    }
197			}
198		    }
199		    if (touched) {
200			touchline(dst, dminrow, (dmaxrow - dminrow + 1));
201		    }
202		}
203		T(("finished copywin"));
204		rc = OK;
205	    }
206	}
207	_nc_unlock_global(curses);
208    }
209    returnCode(rc);
210}
211