comparison: pdcurses/overlay.c
pdcurses/overlay.c
- changeset 97
- 2d43f05b284c
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| 96:5314ebdcb38d | 97:2d43f05b284c |
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| 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 } |
