summaryrefslogtreecommitdiff
path: root/payloads/libpayload/curses/PDCurses/pdcurses/overlay.c
blob: d1e9f217196ed39db5d747d23cb5372eff404e1f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/* Public Domain Curses */

#include <curspriv.h>

RCSID("$Id: overlay.c,v 1.36 2008/07/14 12:35:23 wmcbrine Exp $")

/*man-start**************************************************************

  Name:                                                         overlay

  Synopsis:
        int overlay(const WINDOW *src_w, WINDOW *dst_w)
        int overwrite(const WINDOW *src_w, WINDOW *dst_w)
        int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
                    int src_tc, int dst_tr, int dst_tc, int dst_br,
                    int dst_bc, bool overlay)

  Description:
        overlay() and overwrite() copy all the text from src_w into
        dst_w. The windows need not be the same size. Those characters
        in the source window that intersect with the destination window
        are copied, so that the characters appear in the same physical
        position on the screen. The difference between the two functions
        is that overlay() is non-destructive (blanks are not copied)
        while overwrite() is destructive (blanks are copied).

        copywin() is similar, but doesn't require that the two windows
        overlap. The arguments src_tc and src_tr specify the top left
        corner of the region to be copied. dst_tc, dst_tr, dst_br, and
        dst_bc specify the region within the destination window to copy
        to. The argument "overlay", if TRUE, indicates that the copy is
        done non-destructively (as in overlay()); blanks in the source
        window are not copied to the destination window. When overlay is
        FALSE, blanks are copied.

  Return Value:
        All functions return OK on success and ERR on error.

  Portability                                X/Open    BSD    SYS V
        overlay                                 Y       Y       Y
        overwrite                               Y       Y       Y
        copywin                                 Y       -      3.0

**man-end****************************************************************/

/* Thanks to Andreas Otte <venn@@uni-paderborn.de> for the
   corrected overlay()/overwrite() behavior. */

static int _copy_win(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
                     int src_tc, int src_br, int src_bc, int dst_tr,
                     int dst_tc, bool _overlay)
{
    int col, line, y1, fc, *minchng, *maxchng;
    chtype *w1ptr, *w2ptr;

    int lc = 0;
    int xdiff = src_bc - src_tc;
    int ydiff = src_br - src_tr;

    if (!src_w || !dst_w)
        return ERR;

    minchng = dst_w->_firstch;
    maxchng = dst_w->_lastch;

    for (y1 = 0; y1 < dst_tr; y1++)
    {
        minchng++;
        maxchng++;
    }

    for (line = 0; line < ydiff; line++)
    {
        w1ptr = src_w->_y[line + src_tr] + src_tc;
        w2ptr = dst_w->_y[line + dst_tr] + dst_tc;

        fc = _NO_CHANGE;

        for (col = 0; col < xdiff; col++)
        {
            if ((*w1ptr) != (*w2ptr) &&
                !((*w1ptr & A_CHARTEXT) == ' ' && _overlay))
            {
                *w2ptr = *w1ptr;

                if (fc == _NO_CHANGE)
                    fc = col + dst_tc;

                lc = col + dst_tc;
            }

            w1ptr++;
            w2ptr++;
        }

        if (*minchng == _NO_CHANGE)
        {
            *minchng = fc;
            *maxchng = lc;
        }
        else if (fc != _NO_CHANGE)
        {
            if (fc < *minchng)
                *minchng = fc;
            if (lc > *maxchng)
                *maxchng = lc;
        }

        minchng++;
        maxchng++;
    }

    return OK;
}

int overlay(const WINDOW *src_w, WINDOW *dst_w)
{
    int first_line, first_col, last_line, last_col;
    int src_start_x, src_start_y, dst_start_x, dst_start_y;
    int xdiff, ydiff;

    PDC_LOG(("overlay() - called\n"));

    if (!src_w || !dst_w)
        return ERR;

    first_col = max(dst_w->_begx, src_w->_begx);
    first_line = max(dst_w->_begy, src_w->_begy);

    last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
    last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);

    /* determine the overlapping region of the two windows in real
       coordinates */

    /* if no overlapping region, do nothing */

    if ((last_col < first_col) || (last_line < first_line))
        return OK;

    /* size of overlapping region */

    xdiff = last_col - first_col;
    ydiff = last_line - first_line;

    if (src_w->_begx <= dst_w->_begx)
    {
        src_start_x = dst_w->_begx - src_w->_begx;
        dst_start_x = 0;
    }
    else
    {
        dst_start_x = src_w->_begx - dst_w->_begx;
        src_start_x = 0;
    }

    if (src_w->_begy <= dst_w->_begy)
    {
        src_start_y = dst_w->_begy - src_w->_begy;
        dst_start_y = 0;
    }
    else
    {
        dst_start_y = src_w->_begy - dst_w->_begy;
        src_start_y = 0;
    }

    return _copy_win(src_w, dst_w, src_start_y, src_start_x,
                     src_start_y + ydiff, src_start_x + xdiff,
                     dst_start_y, dst_start_x, TRUE);
}

int overwrite(const WINDOW *src_w, WINDOW *dst_w)
{
    int first_line, first_col, last_line, last_col;
    int src_start_x, src_start_y, dst_start_x, dst_start_y;
    int xdiff, ydiff;

    PDC_LOG(("overwrite() - called\n"));

    if (!src_w || !dst_w)
        return ERR;

    first_col = max(dst_w->_begx, src_w->_begx);
    first_line = max(dst_w->_begy, src_w->_begy);

    last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
    last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);

    /* determine the overlapping region of the two windows in real
       coordinates */

    /* if no overlapping region, do nothing */

    if ((last_col < first_col) || (last_line < first_line))
        return OK;

    /* size of overlapping region */

    xdiff = last_col - first_col;
    ydiff = last_line - first_line;

    if (src_w->_begx <= dst_w->_begx)
    {
        src_start_x = dst_w->_begx - src_w->_begx;
        dst_start_x = 0;
    }
    else
    {
        dst_start_x = src_w->_begx - dst_w->_begx;
        src_start_x = 0;
    }

    if (src_w->_begy <= dst_w->_begy)
    {
        src_start_y = dst_w->_begy - src_w->_begy;
        dst_start_y = 0;
    }
    else
    {
        dst_start_y = src_w->_begy - dst_w->_begy;
        src_start_y = 0;
    }

    return _copy_win(src_w, dst_w, src_start_y, src_start_x,
                     src_start_y + ydiff, src_start_x + xdiff,
                     dst_start_y, dst_start_x, FALSE);
}

int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr, int src_tc,
            int dst_tr, int dst_tc, int dst_br, int dst_bc, int _overlay)
{
    int src_end_x, src_end_y;
    int src_rows, src_cols, dst_rows, dst_cols;
    int min_rows, min_cols;

    PDC_LOG(("copywin() - called\n"));

    if (!src_w || !dst_w || dst_w == curscr || dst_br > dst_w->_maxy
        || dst_bc > dst_w->_maxx || dst_tr < 0 || dst_tc < 0)
        return ERR;

    src_rows = src_w->_maxy - src_tr;
    src_cols = src_w->_maxx - src_tc;
    dst_rows = dst_br - dst_tr + 1;
    dst_cols = dst_bc - dst_tc + 1;

    min_rows = min(src_rows, dst_rows);
    min_cols = min(src_cols, dst_cols);

    src_end_y = src_tr + min_rows;
    src_end_x = src_tc + min_cols;

    return _copy_win(src_w, dst_w, src_tr, src_tc, src_end_y, src_end_x,
                     dst_tr, dst_tc, _overlay);
}