payloads/libpayload/curses/PDCurses/pdcurses/overlay.c

   1 /* Public Domain Curses */
   2
   3 #include <curspriv.h>
   4
   5 RCSID("$Id: overlay.c,v 1.36 2008/07/14 12:35:23 wmcbrine Exp $")
   6
   7 /*man-start**************************************************************
   8
   9   Name:                                                         overlay
  10
  11   Synopsis:
  12         int overlay(const WINDOW *src_w, WINDOW *dst_w)
  13         int overwrite(const WINDOW *src_w, WINDOW *dst_w)
  14         int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
  15                     int src_tc, int dst_tr, int dst_tc, int dst_br,
  16                     int dst_bc, bool overlay)
  17
  18   Description:
  19         overlay() and overwrite() copy all the text from src_w into
  20         dst_w. The windows need not be the same size. Those characters
  21         in the source window that intersect with the destination window
  22         are copied, so that the characters appear in the same physical
  23         position on the screen. The difference between the two functions
  24         is that overlay() is non-destructive (blanks are not copied)
  25         while overwrite() is destructive (blanks are copied).
  26
  27         copywin() is similar, but doesn't require that the two windows
  28         overlap. The arguments src_tc and src_tr specify the top left
  29         corner of the region to be copied. dst_tc, dst_tr, dst_br, and
  30         dst_bc specify the region within the destination window to copy
  31         to. The argument "overlay", if TRUE, indicates that the copy is
  32         done non-destructively (as in overlay()); blanks in the source
  33         window are not copied to the destination window. When overlay is
  34         FALSE, blanks are copied.
  35
  36   Return Value:
  37         All functions return OK on success and ERR on error.
  38
  39   Portability                                X/Open    BSD    SYS V
  40         overlay                                 Y       Y       Y
  41         overwrite                               Y       Y       Y
  42         copywin                                 Y       -      3.0
  43
  44 **man-end****************************************************************/
  45
  46 /* Thanks to Andreas Otte <venn@@uni-paderborn.de> for the
  47    corrected overlay()/overwrite() behavior. */
  48
  49 static int _copy_win(const WINDOW *src_w, WINDOW *dst_w, int src_tr,
  50                      int src_tc, int src_br, int src_bc, int dst_tr,
  51                      int dst_tc, bool _overlay)
  52 {
  53     int col, line, y1, fc, *minchng, *maxchng;
  54     chtype *w1ptr, *w2ptr;
  55
  56     int lc = 0;
  57     int xdiff = src_bc - src_tc;
  58     int ydiff = src_br - src_tr;
  59
  60     if (!src_w || !dst_w)
  61         return ERR;
  62
  63     minchng = dst_w->_firstch;
  64     maxchng = dst_w->_lastch;
  65
  66     for (y1 = 0; y1 < dst_tr; y1++)
  67     {
  68         minchng++;
  69         maxchng++;
  70     }
  71
  72     for (line = 0; line < ydiff; line++)
  73     {
  74         w1ptr = src_w->_y[line + src_tr] + src_tc;
  75         w2ptr = dst_w->_y[line + dst_tr] + dst_tc;
  76
  77         fc = _NO_CHANGE;
  78
  79         for (col = 0; col < xdiff; col++)
  80         {
  81             if ((*w1ptr) != (*w2ptr) &&
  82                 !((*w1ptr & A_CHARTEXT) == ' ' && _overlay))
  83             {
  84                 *w2ptr = *w1ptr;
  85
  86                 if (fc == _NO_CHANGE)
  87                     fc = col + dst_tc;
  88
  89                 lc = col + dst_tc;
  90             }
  91
  92             w1ptr++;
  93             w2ptr++;
  94         }
  95
  96         if (*minchng == _NO_CHANGE)
  97         {
  98             *minchng = fc;
  99             *maxchng = lc;
 100         }
 101         else if (fc != _NO_CHANGE)
 102         {
 103             if (fc < *minchng)
 104                 *minchng = fc;
 105             if (lc > *maxchng)
 106                 *maxchng = lc;
 107         }
 108
 109         minchng++;
 110         maxchng++;
 111     }
 112
 113     return OK;
 114 }
 115
 116 int overlay(const WINDOW *src_w, WINDOW *dst_w)
 117 {
 118     int first_line, first_col, last_line, last_col;
 119     int src_start_x, src_start_y, dst_start_x, dst_start_y;
 120     int xdiff, ydiff;
 121
 122     PDC_LOG(("overlay() - called\n"));
 123
 124     if (!src_w || !dst_w)
 125         return ERR;
 126
 127     first_col = max(dst_w->_begx, src_w->_begx);
 128     first_line = max(dst_w->_begy, src_w->_begy);
 129
 130     last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
 131     last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);
 132
 133     /* determine the overlapping region of the two windows in real
 134        coordinates */
 135
 136     /* if no overlapping region, do nothing */
 137
 138     if ((last_col < first_col) || (last_line < first_line))
 139         return OK;
 140
 141     /* size of overlapping region */
 142
 143     xdiff = last_col - first_col;
 144     ydiff = last_line - first_line;
 145
 146     if (src_w->_begx <= dst_w->_begx)
 147     {
 148         src_start_x = dst_w->_begx - src_w->_begx;
 149         dst_start_x = 0;
 150     }
 151     else
 152     {
 153         dst_start_x = src_w->_begx - dst_w->_begx;
 154         src_start_x = 0;
 155     }
 156
 157     if (src_w->_begy <= dst_w->_begy)
 158     {
 159         src_start_y = dst_w->_begy - src_w->_begy;
 160         dst_start_y = 0;
 161     }
 162     else
 163     {
 164         dst_start_y = src_w->_begy - dst_w->_begy;
 165         src_start_y = 0;
 166     }
 167
 168     return _copy_win(src_w, dst_w, src_start_y, src_start_x,
 169                      src_start_y + ydiff, src_start_x + xdiff,
 170                      dst_start_y, dst_start_x, TRUE);
 171 }
 172
 173 int overwrite(const WINDOW *src_w, WINDOW *dst_w)
 174 {
 175     int first_line, first_col, last_line, last_col;
 176     int src_start_x, src_start_y, dst_start_x, dst_start_y;
 177     int xdiff, ydiff;
 178
 179     PDC_LOG(("overwrite() - called\n"));
 180
 181     if (!src_w || !dst_w)
 182         return ERR;
 183
 184     first_col = max(dst_w->_begx, src_w->_begx);
 185     first_line = max(dst_w->_begy, src_w->_begy);
 186
 187     last_col = min(src_w->_begx + src_w->_maxx, dst_w->_begx + dst_w->_maxx);
 188     last_line = min(src_w->_begy + src_w->_maxy, dst_w->_begy + dst_w->_maxy);
 189
 190     /* determine the overlapping region of the two windows in real
 191        coordinates */
 192
 193     /* if no overlapping region, do nothing */
 194
 195     if ((last_col < first_col) || (last_line < first_line))
 196         return OK;
 197
 198     /* size of overlapping region */
 199
 200     xdiff = last_col - first_col;
 201     ydiff = last_line - first_line;
 202
 203     if (src_w->_begx <= dst_w->_begx)
 204     {
 205         src_start_x = dst_w->_begx - src_w->_begx;
 206         dst_start_x = 0;
 207     }
 208     else
 209     {
 210         dst_start_x = src_w->_begx - dst_w->_begx;
 211         src_start_x = 0;
 212     }
 213
 214     if (src_w->_begy <= dst_w->_begy)
 215     {
 216         src_start_y = dst_w->_begy - src_w->_begy;
 217         dst_start_y = 0;
 218     }
 219     else
 220     {
 221         dst_start_y = src_w->_begy - dst_w->_begy;
 222         src_start_y = 0;
 223     }
 224
 225     return _copy_win(src_w, dst_w, src_start_y, src_start_x,
 226                      src_start_y + ydiff, src_start_x + xdiff,
 227                      dst_start_y, dst_start_x, FALSE);
 228 }
 229
 230 int copywin(const WINDOW *src_w, WINDOW *dst_w, int src_tr, int src_tc,
 231             int dst_tr, int dst_tc, int dst_br, int dst_bc, int _overlay)
 232 {
 233     int src_end_x, src_end_y;
 234     int src_rows, src_cols, dst_rows, dst_cols;
 235     int min_rows, min_cols;
 236
 237     PDC_LOG(("copywin() - called\n"));
 238
 239     if (!src_w || !dst_w || dst_w == curscr || dst_br > dst_w->_maxy
 240         || dst_bc > dst_w->_maxx || dst_tr < 0 || dst_tc < 0)
 241         return ERR;
 242
 243     src_rows = src_w->_maxy - src_tr;
 244     src_cols = src_w->_maxx - src_tc;
 245     dst_rows = dst_br - dst_tr + 1;
 246     dst_cols = dst_bc - dst_tc + 1;
 247
 248     min_rows = min(src_rows, dst_rows);
 249     min_cols = min(src_cols, dst_cols);
 250
 251     src_end_y = src_tr + min_rows;
 252     src_end_x = src_tc + min_cols;
 253
 254     return _copy_win(src_w, dst_w, src_tr, src_tc, src_end_y, src_end_x,
 255                      dst_tr, dst_tc, _overlay);
 256 }