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Don't let cursor position overflow when reflowing, from Christopher
[tmux-openbsd.git] / screen-redraw.c
blob4601c6f390436cbed8c4d95ee90d8aa5ea49ce2b
1 /* $OpenBSD$ */
2
3 /*
4 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #include <sys/types.h>
20
21 #include <string.h>
22
23 #include "tmux.h"
24
25 int screen_redraw_cell_border1(struct window_pane *, u_int, u_int);
26 int screen_redraw_cell_border(struct client *, u_int, u_int);
27 int screen_redraw_check_cell(struct client *, u_int, u_int,
28 struct window_pane **);
29 int screen_redraw_check_active(u_int, u_int, int, struct window *,
30 struct window_pane *);
31
32 void screen_redraw_draw_number(struct client *, struct window_pane *);
33
34 #define CELL_INSIDE 0
35 #define CELL_LEFTRIGHT 1
36 #define CELL_TOPBOTTOM 2
37 #define CELL_TOPLEFT 3
38 #define CELL_TOPRIGHT 4
39 #define CELL_BOTTOMLEFT 5
40 #define CELL_BOTTOMRIGHT 6
41 #define CELL_TOPJOIN 7
42 #define CELL_BOTTOMJOIN 8
43 #define CELL_LEFTJOIN 9
44 #define CELL_RIGHTJOIN 10
45 #define CELL_JOIN 11
46 #define CELL_OUTSIDE 12
47
48 #define CELL_BORDERS " xqlkmjwvtun~"
49
50 /* Check if cell is on the border of a particular pane. */
51 int
52 screen_redraw_cell_border1(struct window_pane *wp, u_int px, u_int py)
53 {
54 /* Inside pane. */
55 if (px >= wp->xoff && px < wp->xoff + wp->sx &&
56 py >= wp->yoff && py < wp->yoff + wp->sy)
57 return (0);
58
59 /* Left/right borders. */
60 if ((wp->yoff == 0 || py >= wp->yoff - 1) && py <= wp->yoff + wp->sy) {
61 if (wp->xoff != 0 && px == wp->xoff - 1)
62 return (1);
63 if (px == wp->xoff + wp->sx)
64 return (1);
65 }
66
67 /* Top/bottom borders. */
68 if ((wp->xoff == 0 || px >= wp->xoff - 1) && px <= wp->xoff + wp->sx) {
69 if (wp->yoff != 0 && py == wp->yoff - 1)
70 return (1);
71 if (py == wp->yoff + wp->sy)
72 return (1);
73 }
74
75 /* Outside pane. */
76 return (-1);
77 }
78
79 /* Check if a cell is on the pane border. */
80 int
81 screen_redraw_cell_border(struct client *c, u_int px, u_int py)
82 {
83 struct window *w = c->session->curw->window;
84 struct window_pane *wp;
85 int retval;
86
87 /* Check all the panes. */
88 TAILQ_FOREACH(wp, &w->panes, entry) {
89 if (!window_pane_visible(wp))
90 continue;
91 if ((retval = screen_redraw_cell_border1(wp, px, py)) != -1)
92 return (retval);
93 }
94
95 return (0);
96 }
97
98 /* Check if cell inside a pane. */
99 int
100 screen_redraw_check_cell(struct client *c, u_int px, u_int py,
101 struct window_pane **wpp)
102 {
103 struct window *w = c->session->curw->window;
104 struct window_pane *wp;
105 int borders;
106
107 if (px > w->sx || py > w->sy)
108 return (CELL_OUTSIDE);
109
110 TAILQ_FOREACH(wp, &w->panes, entry) {
111 if (!window_pane_visible(wp))
112 continue;
113 *wpp = wp;
114
115 /* If outside the pane and its border, skip it. */
116 if ((wp->xoff != 0 && px < wp->xoff - 1) ||
117 px > wp->xoff + wp->sx ||
118 (wp->yoff != 0 && py < wp->yoff - 1) ||
119 py > wp->yoff + wp->sy)
120 continue;
121
122 /* If definitely inside, return so. */
123 if (!screen_redraw_cell_border(c, px, py))
124 return (CELL_INSIDE);
125
126 /*
127 * Construct a bitmask of whether the cells to the left (bit
128 * 4), right, top, and bottom (bit 1) of this cell are borders.
129 */
130 borders = 0;
131 if (px == 0 || screen_redraw_cell_border(c, px - 1, py))
132 borders |= 8;
133 if (px <= w->sx && screen_redraw_cell_border(c, px + 1, py))
134 borders |= 4;
135 if (py == 0 || screen_redraw_cell_border(c, px, py - 1))
136 borders |= 2;
137 if (py <= w->sy && screen_redraw_cell_border(c, px, py + 1))
138 borders |= 1;
139
140 /*
141 * Figure out what kind of border this cell is. Only one bit
142 * set doesn't make sense (can't have a border cell with no
143 * others connected).
144 */
145 switch (borders) {
146 case 15: /* 1111, left right top bottom */
147 return (CELL_JOIN);
148 case 14: /* 1110, left right top */
149 return (CELL_BOTTOMJOIN);
150 case 13: /* 1101, left right bottom */
151 return (CELL_TOPJOIN);
152 case 12: /* 1100, left right */
153 return (CELL_TOPBOTTOM);
154 case 11: /* 1011, left top bottom */
155 return (CELL_RIGHTJOIN);
156 case 10: /* 1010, left top */
157 return (CELL_BOTTOMRIGHT);
158 case 9: /* 1001, left bottom */
159 return (CELL_TOPRIGHT);
160 case 7: /* 0111, right top bottom */
161 return (CELL_LEFTJOIN);
162 case 6: /* 0110, right top */
163 return (CELL_BOTTOMLEFT);
164 case 5: /* 0101, right bottom */
165 return (CELL_TOPLEFT);
166 case 3: /* 0011, top bottom */
167 return (CELL_LEFTRIGHT);
168 }
169 }
170
171 *wpp = NULL;
172 return (CELL_OUTSIDE);
173 }
174
175 /* Check active pane indicator. */
176 int
177 screen_redraw_check_active(u_int px, u_int py, int type, struct window *w,
178 struct window_pane *wp)
179 {
180 /* Is this off the active pane border? */
181 if (screen_redraw_cell_border1(w->active, px, py) != 1)
182 return (0);
183
184 /* If there are more than two panes, that's enough. */
185 if (window_count_panes(w) != 2)
186 return (1);
187
188 /* Else if the cell is not a border cell, forget it. */
189 if (wp == NULL || (type == CELL_OUTSIDE || type == CELL_INSIDE))
190 return (1);
191
192 /* Check if the pane covers the whole width. */
193 if (wp->xoff == 0 && wp->sx == w->sx) {
194 /* This can either be the top pane or the bottom pane. */
195 if (wp->yoff == 0) { /* top pane */
196 if (wp == w->active)
197 return (px <= wp->sx / 2);
198 return (px > wp->sx / 2);
199 }
200 return (0);
201 }
202
203 /* Check if the pane covers the whole height. */
204 if (wp->yoff == 0 && wp->sy == w->sy) {
205 /* This can either be the left pane or the right pane. */
206 if (wp->xoff == 0) { /* left pane */
207 if (wp == w->active)
208 return (py <= wp->sy / 2);
209 return (py > wp->sy / 2);
210 }
211 return (0);
212 }
213
214 return (type);
215 }
216
217 /* Redraw entire screen. */
218 void
219 screen_redraw_screen(struct client *c, int status_only, int borders_only)
220 {
221 struct window *w = c->session->curw->window;
222 struct options *oo = &c->session->options;
223 struct tty *tty = &c->tty;
224 struct window_pane *wp;
225 struct grid_cell active_gc, other_gc;
226 u_int i, j, type, top;
227 int status, spos, fg, bg;
228
229 /* Suspended clients should not be updated. */
230 if (c->flags & CLIENT_SUSPENDED)
231 return;
232
233 /* Get status line, er, status. */
234 spos = options_get_number(oo, "status-position");
235 if (c->message_string != NULL || c->prompt_string != NULL)
236 status = 1;
237 else
238 status = options_get_number(oo, "status");
239 top = 0;
240 if (status && spos == 0)
241 top = 1;
242
243 /* If only drawing status and it is present, don't need the rest. */
244 if (status_only && status) {
245 if (top)
246 tty_draw_line(tty, &c->status, 0, 0, 0);
247 else
248 tty_draw_line(tty, &c->status, 0, 0, tty->sy - 1);
249 tty_reset(tty);
250 return;
251 }
252
253 /* Set up pane border attributes. */
254 memcpy(&other_gc, &grid_marker_cell, sizeof other_gc);
255 memcpy(&active_gc, &grid_marker_cell, sizeof active_gc);
256 active_gc.attr = other_gc.attr = GRID_ATTR_CHARSET;
257 fg = options_get_number(oo, "pane-border-fg");
258 colour_set_fg(&other_gc, fg);
259 bg = options_get_number(oo, "pane-border-bg");
260 colour_set_bg(&other_gc, bg);
261 fg = options_get_number(oo, "pane-active-border-fg");
262 colour_set_fg(&active_gc, fg);
263 bg = options_get_number(oo, "pane-active-border-bg");
264 colour_set_bg(&active_gc, bg);
265
266 /* Draw background and borders. */
267 for (j = 0; j < tty->sy - status; j++) {
268 if (status_only) {
269 if (spos == 1 && j != tty->sy - 1)
270 continue;
271 else if (spos == 0 && j != 0)
272 break;
273 }
274 for (i = 0; i < tty->sx; i++) {
275 type = screen_redraw_check_cell(c, i, j, &wp);
276 if (type == CELL_INSIDE)
277 continue;
278 if (screen_redraw_check_active(i, j, type, w, wp))
279 tty_attributes(tty, &active_gc);
280 else
281 tty_attributes(tty, &other_gc);
282 tty_cursor(tty, i, top + j);
283 tty_putc(tty, CELL_BORDERS[type]);
284 }
285 }
286
287 /* If only drawing borders, that's it. */
288 if (borders_only)
289 return;
290
291 /* Draw the panes, if necessary. */
292 TAILQ_FOREACH(wp, &w->panes, entry) {
293 if (!window_pane_visible(wp))
294 continue;
295 for (i = 0; i < wp->sy; i++) {
296 if (status_only) {
297 if (spos == 1 && wp->yoff + i != tty->sy - 1)
298 continue;
299 else if (spos == 0 && wp->yoff + i != 0)
300 break;
301 }
302 tty_draw_line(
303 tty, wp->screen, i, wp->xoff, top + wp->yoff);
304 }
305 if (c->flags & CLIENT_IDENTIFY)
306 screen_redraw_draw_number(c, wp);
307 }
308
309 /* Draw the status line. */
310 if (status) {
311 if (top)
312 tty_draw_line(tty, &c->status, 0, 0, 0);
313 else
314 tty_draw_line(tty, &c->status, 0, 0, tty->sy - 1);
315 }
316 tty_reset(tty);
317 }
318
319 /* Draw a single pane. */
320 void
321 screen_redraw_pane(struct client *c, struct window_pane *wp)
322 {
323 u_int i, yoff;
324
325 if (!window_pane_visible(wp))
326 return;
327
328 yoff = wp->yoff;
329 if (status_at_line(c) == 0)
330 yoff++;
331
332 for (i = 0; i < wp->sy; i++)
333 tty_draw_line(&c->tty, wp->screen, i, wp->xoff, yoff);
334 tty_reset(&c->tty);
335 }
336
337 /* Draw number on a pane. */
338 void
339 screen_redraw_draw_number(struct client *c, struct window_pane *wp)
340 {
341 struct tty *tty = &c->tty;
342 struct session *s = c->session;
343 struct options *oo = &s->options;
344 struct window *w = wp->window;
345 struct grid_cell gc;
346 u_int idx, px, py, i, j, xoff, yoff;
347 int colour, active_colour;
348 char buf[16], *ptr;
349 size_t len;
350
351 if (window_pane_index(wp, &idx) != 0)
352 fatalx("index not found");
353 len = xsnprintf(buf, sizeof buf, "%u", idx);
354
355 if (wp->sx < len)
356 return;
357 colour = options_get_number(oo, "display-panes-colour");
358 active_colour = options_get_number(oo, "display-panes-active-colour");
359
360 px = wp->sx / 2; py = wp->sy / 2;
361 xoff = wp->xoff; yoff = wp->yoff;
362
363 if (wp->sx < len * 6 || wp->sy < 5) {
364 tty_cursor(tty, xoff + px - len / 2, yoff + py);
365 goto draw_text;
366 }
367
368 px -= len * 3;
369 py -= 2;
370
371 memcpy(&gc, &grid_marker_cell, sizeof gc);
372 if (w->active == wp)
373 colour_set_bg(&gc, active_colour);
374 else
375 colour_set_bg(&gc, colour);
376 tty_attributes(tty, &gc);
377 for (ptr = buf; *ptr != '\0'; ptr++) {
378 if (*ptr < '0' || *ptr > '9')
379 continue;
380 idx = *ptr - '0';
381
382 for (j = 0; j < 5; j++) {
383 for (i = px; i < px + 5; i++) {
384 tty_cursor(tty, xoff + i, yoff + py + j);
385 if (clock_table[idx][j][i - px])
386 tty_putc(tty, ' ');
387 }
388 }
389 px += 6;
390 }
391
392 len = xsnprintf(buf, sizeof buf, "%ux%u", wp->sx, wp->sy);
393 if (wp->sx < len || wp->sy < 6)
394 return;
395 tty_cursor(tty, xoff + wp->sx - len, yoff);
396
397 draw_text:
398 memcpy(&gc, &grid_marker_cell, sizeof gc);
399 if (w->active == wp)
400 colour_set_fg(&gc, active_colour);
401 else
402 colour_set_fg(&gc, colour);
403 tty_attributes(tty, &gc);
404 tty_puts(tty, buf);
405
406 tty_cursor(tty, 0, 0);
407 }