* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>

/* $OpenBSD$ */

/*
* Copyright (c) 2007 Nicholas Marriott <[email protected]>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>

#include "tmux.h"

static void screen_redraw_draw_borders(struct screen_redraw_ctx *);
static void screen_redraw_draw_panes(struct screen_redraw_ctx *);
static void screen_redraw_draw_status(struct screen_redraw_ctx *);
static void screen_redraw_draw_pane(struct screen_redraw_ctx *,
struct window_pane *);
static void screen_redraw_set_context(struct client *,
struct screen_redraw_ctx *);

#define START_ISOLATE "\342\201\246"
#define END_ISOLATE "\342\201\251"

/* Border in relation to a pane. */
enum screen_redraw_border_type {
SCREEN_REDRAW_OUTSIDE,
SCREEN_REDRAW_INSIDE,
SCREEN_REDRAW_BORDER_LEFT,
SCREEN_REDRAW_BORDER_RIGHT,
SCREEN_REDRAW_BORDER_TOP,
SCREEN_REDRAW_BORDER_BOTTOM
};
#define BORDER_MARKERS " +,.-"

/* Get cell border character. */
static void
screen_redraw_border_set(struct window *w, struct window_pane *wp,
enum pane_lines pane_lines, int cell_type, struct grid_cell *gc)
{
u_int idx;

if (cell_type == CELL_OUTSIDE && w->fill_character != NULL) {
utf8_copy(&gc->data, &w->fill_character[0]);
return;
}

switch (pane_lines) {
case PANE_LINES_NUMBER:
if (cell_type == CELL_OUTSIDE) {
gc->attr |= GRID_ATTR_CHARSET;
utf8_set(&gc->data, CELL_BORDERS[CELL_OUTSIDE]);
break;
}
gc->attr &= ~GRID_ATTR_CHARSET;
if (wp != NULL && window_pane_index(wp, &idx) == 0)
utf8_set(&gc->data, '0' + (idx % 10));
else
utf8_set(&gc->data, '*');
break;
case PANE_LINES_DOUBLE:
gc->attr &= ~GRID_ATTR_CHARSET;
utf8_copy(&gc->data, tty_acs_double_borders(cell_type));
break;
case PANE_LINES_HEAVY:
gc->attr &= ~GRID_ATTR_CHARSET;
utf8_copy(&gc->data, tty_acs_heavy_borders(cell_type));
break;
case PANE_LINES_SIMPLE:
gc->attr &= ~GRID_ATTR_CHARSET;
utf8_set(&gc->data, SIMPLE_BORDERS[cell_type]);
break;
default:
gc->attr |= GRID_ATTR_CHARSET;
utf8_set(&gc->data, CELL_BORDERS[cell_type]);
break;
}
}

/* Return if window has only two panes. */
static int
screen_redraw_two_panes(struct window *w, int direction)
{
struct window_pane *wp;

wp = TAILQ_NEXT(TAILQ_FIRST(&w->panes), entry);
if (wp == NULL)
return (0); /* one pane */
if (TAILQ_NEXT(wp, entry) != NULL)
return (0); /* more than two panes */
if (direction == 0 && wp->xoff == 0)
return (0);
if (direction == 1 && wp->yoff == 0)
return (0);
return (1);
}

/* Check if cell is on the border of a pane. */
static enum screen_redraw_border_type
screen_redraw_pane_border(struct screen_redraw_ctx *ctx, struct window_pane *wp,
u_int px, u_int py)
{
struct options *oo = wp->window->options;
int split = 0;
u_int ex = wp->xoff + wp->sx, ey = wp->yoff + wp->sy;
int pane_status = ctx->pane_status;

/* Inside pane. */
if (px >= wp->xoff && px < ex && py >= wp->yoff && py < ey)
return (SCREEN_REDRAW_INSIDE);

/* Get pane indicator. */
switch (options_get_number(oo, "pane-border-indicators")) {
case PANE_BORDER_COLOUR:
case PANE_BORDER_BOTH:
split = 1;
break;
}

/* Left/right borders. */
if (pane_status == PANE_STATUS_OFF) {
if (screen_redraw_two_panes(wp->window, 0) && split) {
if (wp->xoff == 0 && px == wp->sx && py <= wp->sy / 2)
return (SCREEN_REDRAW_BORDER_RIGHT);
if (wp->xoff != 0 &&
px == wp->xoff - 1 &&
py > wp->sy / 2)
return (SCREEN_REDRAW_BORDER_LEFT);
} else {
if ((wp->yoff == 0 || py >= wp->yoff - 1) && py <= ey) {
if (wp->xoff != 0 && px == wp->xoff - 1)
return (SCREEN_REDRAW_BORDER_LEFT);
if (px == ex)
return (SCREEN_REDRAW_BORDER_RIGHT);
}
}
} else {
if ((wp->yoff == 0 || py >= wp->yoff - 1) && py <= ey) {
if (wp->xoff != 0 && px == wp->xoff - 1)
return (SCREEN_REDRAW_BORDER_LEFT);
if (px == ex)
return (SCREEN_REDRAW_BORDER_RIGHT);
}
}

/* Top/bottom borders. */
if (pane_status == PANE_STATUS_OFF) {
if (screen_redraw_two_panes(wp->window, 1) && split) {
if (wp->yoff == 0 && py == wp->sy && px <= wp->sx / 2)
return (SCREEN_REDRAW_BORDER_BOTTOM);
if (wp->yoff != 0 &&
py == wp->yoff - 1 &&
px > wp->sx / 2)
return (SCREEN_REDRAW_BORDER_TOP);
} else {
if ((wp->xoff == 0 || px >= wp->xoff - 1) && px <= ex) {
if (wp->yoff != 0 && py == wp->yoff - 1)
return (SCREEN_REDRAW_BORDER_TOP);
if (py == ey)
return (SCREEN_REDRAW_BORDER_BOTTOM);
}
}
} else if (pane_status == PANE_STATUS_TOP) {
if ((wp->xoff == 0 || px >= wp->xoff - 1) && px <= ex) {
if (wp->yoff != 0 && py == wp->yoff - 1)
return (SCREEN_REDRAW_BORDER_TOP);
}
} else {
if ((wp->xoff == 0 || px >= wp->xoff - 1) && px <= ex) {
if (py == ey)
return (SCREEN_REDRAW_BORDER_BOTTOM);
}
}

/* Outside pane. */
return (SCREEN_REDRAW_OUTSIDE);
}

/* Check if a cell is on a border. */
static int
screen_redraw_cell_border(struct screen_redraw_ctx *ctx, u_int px, u_int py)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct window_pane *wp;

/* Outside the window? */
if (px > w->sx || py > w->sy)
return (0);

/* On the window border? */
if (px == w->sx || py == w->sy)
return (1);

/* Check all the panes. */
TAILQ_FOREACH(wp, &w->panes, entry) {
if (!window_pane_visible(wp))
continue;
switch (screen_redraw_pane_border(ctx, wp, px, py)) {
case SCREEN_REDRAW_INSIDE:
return (0);
case SCREEN_REDRAW_OUTSIDE:
break;
default:
return (1);
}
}

return (0);
}

/* Work out type of border cell from surrounding cells. */
static int
screen_redraw_type_of_cell(struct screen_redraw_ctx *ctx, u_int px, u_int py)
{
struct client *c = ctx->c;
int pane_status = ctx->pane_status;
struct window *w = c->session->curw->window;
u_int sx = w->sx, sy = w->sy;
int borders = 0;

/* Is this outside the window? */
if (px > sx || py > sy)
return (CELL_OUTSIDE);

/*
* Construct a bitmask of whether the cells to the left (bit 4), right,
* top, and bottom (bit 1) of this cell are borders.
*/
if (px == 0 || screen_redraw_cell_border(ctx, px - 1, py))
borders |= 8;
if (px <= sx && screen_redraw_cell_border(ctx, px + 1, py))
borders |= 4;
if (pane_status == PANE_STATUS_TOP) {
if (py != 0 &&
screen_redraw_cell_border(ctx, px, py - 1))
borders |= 2;
if (screen_redraw_cell_border(ctx, px, py + 1))
borders |= 1;
} else if (pane_status == PANE_STATUS_BOTTOM) {
if (py == 0 ||
screen_redraw_cell_border(ctx, px, py - 1))
borders |= 2;
if (py != sy - 1 &&
screen_redraw_cell_border(ctx, px, py + 1))
borders |= 1;
} else {
if (py == 0 ||
screen_redraw_cell_border(ctx, px, py - 1))
borders |= 2;
if (screen_redraw_cell_border(ctx, px, py + 1))
borders |= 1;
}

/*
* Figure out what kind of border this cell is. Only one bit set
* doesn't make sense (can't have a border cell with no others
* connected).
*/
switch (borders) {
case 15: /* 1111, left right top bottom */
return (CELL_JOIN);
case 14: /* 1110, left right top */
return (CELL_BOTTOMJOIN);
case 13: /* 1101, left right bottom */
return (CELL_TOPJOIN);
case 12: /* 1100, left right */
return (CELL_LEFTRIGHT);
case 11: /* 1011, left top bottom */
return (CELL_RIGHTJOIN);
case 10: /* 1010, left top */
return (CELL_BOTTOMRIGHT);
case 9: /* 1001, left bottom */
return (CELL_TOPRIGHT);
case 7: /* 0111, right top bottom */
return (CELL_LEFTJOIN);
case 6: /* 0110, right top */
return (CELL_BOTTOMLEFT);
case 5: /* 0101, right bottom */
return (CELL_TOPLEFT);
case 3: /* 0011, top bottom */
return (CELL_TOPBOTTOM);
}
return (CELL_OUTSIDE);
}

/* Check if cell inside a pane. */
static int
screen_redraw_check_cell(struct screen_redraw_ctx *ctx, u_int px, u_int py,
struct window_pane **wpp)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct window_pane *wp, *active;
int pane_status = ctx->pane_status;
int border;
u_int right, line;

*wpp = NULL;

if (px > w->sx || py > w->sy)
return (CELL_OUTSIDE);
if (px == w->sx || py == w->sy) /* window border */
return (screen_redraw_type_of_cell(ctx, px, py));

if (pane_status != PANE_STATUS_OFF) {
active = wp = server_client_get_pane(c);
do {
if (!window_pane_visible(wp))
goto next1;

if (pane_status == PANE_STATUS_TOP)
line = wp->yoff - 1;
else
line = wp->yoff + wp->sy;
right = wp->xoff + 2 + wp->status_size - 1;

if (py == line && px >= wp->xoff + 2 && px <= right)
return (CELL_INSIDE);

next1:
wp = TAILQ_NEXT(wp, entry);
if (wp == NULL)
wp = TAILQ_FIRST(&w->panes);
} while (wp != active);
}

active = wp = server_client_get_pane(c);
do {
if (!window_pane_visible(wp))
goto next2;
*wpp = wp;

/*
* If definitely inside, return. If not on border, skip.
* Otherwise work out the cell.
*/
border = screen_redraw_pane_border(ctx, wp, px, py);
if (border == SCREEN_REDRAW_INSIDE)
return (CELL_INSIDE);
if (border == SCREEN_REDRAW_OUTSIDE)
goto next2;
return (screen_redraw_type_of_cell(ctx, px, py));

next2:
wp = TAILQ_NEXT(wp, entry);
if (wp == NULL)
wp = TAILQ_FIRST(&w->panes);
} while (wp != active);

return (CELL_OUTSIDE);
}

/* Check if the border of a particular pane. */
static int
screen_redraw_check_is(struct screen_redraw_ctx *ctx, u_int px, u_int py,
struct window_pane *wp)
{
enum screen_redraw_border_type border;

border = screen_redraw_pane_border(ctx, wp, px, py);
if (border != SCREEN_REDRAW_INSIDE && border != SCREEN_REDRAW_OUTSIDE)
return (1);
return (0);
}

/* Update pane status. */
static int
screen_redraw_make_pane_status(struct client *c, struct window_pane *wp,
struct screen_redraw_ctx *rctx, enum pane_lines pane_lines)
{
struct window *w = wp->window;
struct grid_cell gc;
const char *fmt;
struct format_tree *ft;
char *expanded;
int pane_status = rctx->pane_status;
u_int width, i, cell_type, px, py;
struct screen_write_ctx ctx;
struct screen old;

ft = format_create(c, NULL, FORMAT_PANE|wp->id, FORMAT_STATUS);
format_defaults(ft, c, c->session, c->session->curw, wp);

if (wp == server_client_get_pane(c))
style_apply(&gc, w->options, "pane-active-border-style", ft);
else
style_apply(&gc, w->options, "pane-border-style", ft);
fmt = options_get_string(wp->options, "pane-border-format");

expanded = format_expand_time(ft, fmt);
if (wp->sx < 4)
wp->status_size = width = 0;
else
wp->status_size = width = wp->sx - 4;

memcpy(&old, &wp->status_screen, sizeof old);
screen_init(&wp->status_screen, width, 1, 0);
wp->status_screen.mode = 0;

screen_write_start(&ctx, &wp->status_screen);

for (i = 0; i < width; i++) {
px = wp->xoff + 2 + i;
if (pane_status == PANE_STATUS_TOP)
py = wp->yoff - 1;
else
py = wp->yoff + wp->sy;
cell_type = screen_redraw_type_of_cell(rctx, px, py);
screen_redraw_border_set(w, wp, pane_lines, cell_type, &gc);
screen_write_cell(&ctx, &gc);
}
gc.attr &= ~GRID_ATTR_CHARSET;

screen_write_cursormove(&ctx, 0, 0, 0);
format_draw(&ctx, &gc, width, expanded, NULL, 0);
screen_write_stop(&ctx);

free(expanded);
format_free(ft);

if (grid_compare(wp->status_screen.grid, old.grid) == 0) {
screen_free(&old);
return (0);
}
screen_free(&old);
return (1);
}

/* Draw pane status. */
static void
screen_redraw_draw_pane_status(struct screen_redraw_ctx *ctx)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct tty *tty = &c->tty;
struct window_pane *wp;
struct screen *s;
u_int i, x, width, xoff, yoff, size;

log_debug("%s: %s @%u", __func__, c->name, w->id);

TAILQ_FOREACH(wp, &w->panes, entry) {
if (!window_pane_visible(wp))
continue;
s = &wp->status_screen;

size = wp->status_size;
if (ctx->pane_status == PANE_STATUS_TOP)
yoff = wp->yoff - 1;
else
yoff = wp->yoff + wp->sy;
xoff = wp->xoff + 2;

if (xoff + size <= ctx->ox ||
xoff >= ctx->ox + ctx->sx ||
yoff < ctx->oy ||
yoff >= ctx->oy + ctx->sy)
continue;

if (xoff >= ctx->ox && xoff + size <= ctx->ox + ctx->sx) {
/* All visible. */
i = 0;
x = xoff - ctx->ox;
width = size;
} else if (xoff < ctx->ox && xoff + size > ctx->ox + ctx->sx) {
/* Both left and right not visible. */
i = ctx->ox;
x = 0;
width = ctx->sx;
} else if (xoff < ctx->ox) {
/* Left not visible. */
i = ctx->ox - xoff;
x = 0;
width = size - i;
} else {
/* Right not visible. */
i = 0;
x = xoff - ctx->ox;
width = size - x;
}

if (ctx->statustop)
yoff += ctx->statuslines;
tty_draw_line(tty, s, i, 0, width, x, yoff - ctx->oy,
&grid_default_cell, NULL);
}
tty_cursor(tty, 0, 0);
}

/* Update status line and change flags if unchanged. */
static uint64_t
screen_redraw_update(struct client *c, uint64_t flags)
{
struct window *w = c->session->curw->window;
struct window_pane *wp;
struct options *wo = w->options;
int redraw;
enum pane_lines lines;
struct screen_redraw_ctx ctx;

if (c->message_string != NULL)
redraw = status_message_redraw(c);
else if (c->prompt_string != NULL)
redraw = status_prompt_redraw(c);
else
redraw = status_redraw(c);
if (!redraw && (~flags & CLIENT_REDRAWSTATUSALWAYS))
flags &= ~CLIENT_REDRAWSTATUS;

if (c->overlay_draw != NULL)
flags |= CLIENT_REDRAWOVERLAY;

if (options_get_number(wo, "pane-border-status") != PANE_STATUS_OFF) {
screen_redraw_set_context(c, &ctx);
lines = options_get_number(wo, "pane-border-lines");
redraw = 0;
TAILQ_FOREACH(wp, &w->panes, entry) {
if (screen_redraw_make_pane_status(c, wp, &ctx, lines))
redraw = 1;
}
if (redraw)
flags |= CLIENT_REDRAWBORDERS;
}
return (flags);
}

/* Set up redraw context. */
static void
screen_redraw_set_context(struct client *c, struct screen_redraw_ctx *ctx)
{
struct session *s = c->session;
struct options *oo = s->options;
struct window *w = s->curw->window;
struct options *wo = w->options;
u_int lines;

memset(ctx, 0, sizeof *ctx);
ctx->c = c;

lines = status_line_size(c);
if (c->message_string != NULL || c->prompt_string != NULL)
lines = (lines == 0) ? 1 : lines;
if (lines != 0 && options_get_number(oo, "status-position") == 0)
ctx->statustop = 1;
ctx->statuslines = lines;

ctx->pane_status = options_get_number(wo, "pane-border-status");
ctx->pane_lines = options_get_number(wo, "pane-border-lines");

tty_window_offset(&c->tty, &ctx->ox, &ctx->oy, &ctx->sx, &ctx->sy);

log_debug("%s: %s @%u ox=%u oy=%u sx=%u sy=%u %u/%d", __func__, c->name,
w->id, ctx->ox, ctx->oy, ctx->sx, ctx->sy, ctx->statuslines,
ctx->statustop);
}

/* Redraw entire screen. */
void
screen_redraw_screen(struct client *c)
{
struct screen_redraw_ctx ctx;
uint64_t flags;

if (c->flags & CLIENT_SUSPENDED)
return;

flags = screen_redraw_update(c, c->flags);
if ((flags & CLIENT_ALLREDRAWFLAGS) == 0)
return;

screen_redraw_set_context(c, &ctx);
tty_sync_start(&c->tty);
tty_update_mode(&c->tty, c->tty.mode, NULL);

if (flags & (CLIENT_REDRAWWINDOW|CLIENT_REDRAWBORDERS)) {
log_debug("%s: redrawing borders", c->name);
if (ctx.pane_status != PANE_STATUS_OFF)
screen_redraw_draw_pane_status(&ctx);
screen_redraw_draw_borders(&ctx);
}
if (flags & CLIENT_REDRAWWINDOW) {
log_debug("%s: redrawing panes", c->name);
screen_redraw_draw_panes(&ctx);
}
if (ctx.statuslines != 0 &&
(flags & (CLIENT_REDRAWSTATUS|CLIENT_REDRAWSTATUSALWAYS))) {
log_debug("%s: redrawing status", c->name);
screen_redraw_draw_status(&ctx);
}
if (c->overlay_draw != NULL && (flags & CLIENT_REDRAWOVERLAY)) {
log_debug("%s: redrawing overlay", c->name);
c->overlay_draw(c, c->overlay_data, &ctx);
}

tty_reset(&c->tty);
}

/* Redraw a single pane. */
void
screen_redraw_pane(struct client *c, struct window_pane *wp)
{
struct screen_redraw_ctx ctx;

if (!window_pane_visible(wp))
return;

screen_redraw_set_context(c, &ctx);
tty_sync_start(&c->tty);
tty_update_mode(&c->tty, c->tty.mode, NULL);

screen_redraw_draw_pane(&ctx, wp);

tty_reset(&c->tty);
}

/* Get border cell style. */
static const struct grid_cell *
screen_redraw_draw_borders_style(struct screen_redraw_ctx *ctx, u_int x,
u_int y, struct window_pane *wp)
{
struct client *c = ctx->c;
struct session *s = c->session;
struct window *w = s->curw->window;
struct window_pane *active = server_client_get_pane(c);
struct options *oo = w->options;
struct format_tree *ft;

if (wp->border_gc_set)
return (&wp->border_gc);
wp->border_gc_set = 1;

ft = format_create_defaults(NULL, c, s, s->curw, wp);
if (screen_redraw_check_is(ctx, x, y, active))
style_apply(&wp->border_gc, oo, "pane-active-border-style", ft);
else
style_apply(&wp->border_gc, oo, "pane-border-style", ft);
format_free(ft);

return (&wp->border_gc);
}

/* Draw a border cell. */
static void
screen_redraw_draw_borders_cell(struct screen_redraw_ctx *ctx, u_int i, u_int j)
{
struct client *c = ctx->c;
struct session *s = c->session;
struct window *w = s->curw->window;
struct options *oo = w->options;
struct tty *tty = &c->tty;
struct format_tree *ft;
struct window_pane *wp, *active = server_client_get_pane(c);
struct grid_cell gc;
const struct grid_cell *tmp;
struct overlay_ranges r;
u_int cell_type, x = ctx->ox + i, y = ctx->oy + j;
int arrows = 0, border;
int isolates;

if (c->overlay_check != NULL) {
c->overlay_check(c, c->overlay_data, x, y, 1, &r);
if (r.nx[0] + r.nx[1] == 0)
return;
}

cell_type = screen_redraw_check_cell(ctx, x, y, &wp);
if (cell_type == CELL_INSIDE)
return;

if (wp == NULL) {
if (!ctx->no_pane_gc_set) {
ft = format_create_defaults(NULL, c, s, s->curw, NULL);
memcpy(&ctx->no_pane_gc, &grid_default_cell, sizeof gc);
style_add(&ctx->no_pane_gc, oo, "pane-border-style",
ft);
format_free(ft);
ctx->no_pane_gc_set = 1;
}
memcpy(&gc, &ctx->no_pane_gc, sizeof gc);
} else {
tmp = screen_redraw_draw_borders_style(ctx, x, y, wp);
if (tmp == NULL)
return;
memcpy(&gc, tmp, sizeof gc);

if (server_is_marked(s, s->curw, marked_pane.wp) &&
screen_redraw_check_is(ctx, x, y, marked_pane.wp))
gc.attr ^= GRID_ATTR_REVERSE;
}
screen_redraw_border_set(w, wp, ctx->pane_lines, cell_type, &gc);

if (cell_type == CELL_TOPBOTTOM &&
(c->flags & CLIENT_UTF8) &&
tty_term_has(tty->term, TTYC_BIDI))
isolates = 1;
else
isolates = 0;

if (ctx->statustop)
tty_cursor(tty, i, ctx->statuslines + j);
else
tty_cursor(tty, i, j);
if (isolates)
tty_puts(tty, END_ISOLATE);

switch (options_get_number(oo, "pane-border-indicators")) {
case PANE_BORDER_ARROWS:
case PANE_BORDER_BOTH:
arrows = 1;
break;
}

if (wp != NULL && arrows) {
border = screen_redraw_pane_border(ctx, active, x, y);
if (((i == wp->xoff + 1 &&
(cell_type == CELL_LEFTRIGHT ||
(cell_type == CELL_TOPJOIN &&
border == SCREEN_REDRAW_BORDER_BOTTOM) ||
(cell_type == CELL_BOTTOMJOIN &&
border == SCREEN_REDRAW_BORDER_TOP))) ||
(j == wp->yoff + 1 &&
(cell_type == CELL_TOPBOTTOM ||
(cell_type == CELL_LEFTJOIN &&
border == SCREEN_REDRAW_BORDER_RIGHT) ||
(cell_type == CELL_RIGHTJOIN &&
border == SCREEN_REDRAW_BORDER_LEFT)))) &&
screen_redraw_check_is(ctx, x, y, active)) {
gc.attr |= GRID_ATTR_CHARSET;
utf8_set(&gc.data, BORDER_MARKERS[border]);
}
}

tty_cell(tty, &gc, &grid_default_cell, NULL, NULL);
if (isolates)
tty_puts(tty, START_ISOLATE);
}

/* Draw the borders. */
static void
screen_redraw_draw_borders(struct screen_redraw_ctx *ctx)
{
struct client *c = ctx->c;
struct session *s = c->session;
struct window *w = s->curw->window;
struct window_pane *wp;
u_int i, j;

log_debug("%s: %s @%u", __func__, c->name, w->id);

TAILQ_FOREACH(wp, &w->panes, entry)
wp->border_gc_set = 0;

for (j = 0; j < c->tty.sy - ctx->statuslines; j++) {
for (i = 0; i < c->tty.sx; i++)
screen_redraw_draw_borders_cell(ctx, i, j);
}
}

/* Draw the panes. */
static void
screen_redraw_draw_panes(struct screen_redraw_ctx *ctx)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct window_pane *wp;

log_debug("%s: %s @%u", __func__, c->name, w->id);

TAILQ_FOREACH(wp, &w->panes, entry) {
if (window_pane_visible(wp))
screen_redraw_draw_pane(ctx, wp);
}
}

/* Draw the status line. */
static void
screen_redraw_draw_status(struct screen_redraw_ctx *ctx)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct tty *tty = &c->tty;
struct screen *s = c->status.active;
u_int i, y;

log_debug("%s: %s @%u", __func__, c->name, w->id);

if (ctx->statustop)
y = 0;
else
y = c->tty.sy - ctx->statuslines;
for (i = 0; i < ctx->statuslines; i++) {
tty_draw_line(tty, s, 0, i, UINT_MAX, 0, y + i,
&grid_default_cell, NULL);
}
}

/* Draw one pane. */
static void
screen_redraw_draw_pane(struct screen_redraw_ctx *ctx, struct window_pane *wp)
{
struct client *c = ctx->c;
struct window *w = c->session->curw->window;
struct tty *tty = &c->tty;
struct screen *s = wp->screen;
struct colour_palette *palette = &wp->palette;
struct grid_cell defaults;
u_int i, j, top, x, y, width;

log_debug("%s: %s @%u %%%u", __func__, c->name, w->id, wp->id);

if (wp->xoff + wp->sx <= ctx->ox || wp->xoff >= ctx->ox + ctx->sx)
return;
if (ctx->statustop)
top = ctx->statuslines;
else
top = 0;
for (j = 0; j < wp->sy; j++) {
if (wp->yoff + j < ctx->oy || wp->yoff + j >= ctx->oy + ctx->sy)
continue;
y = top + wp->yoff + j - ctx->oy;

if (wp->xoff >= ctx->ox &&
wp->xoff + wp->sx <= ctx->ox + ctx->sx) {
/* All visible. */
i = 0;
x = wp->xoff - ctx->ox;
width = wp->sx;
} else if (wp->xoff < ctx->ox &&
wp->xoff + wp->sx > ctx->ox + ctx->sx) {
/* Both left and right not visible. */
i = ctx->ox;
x = 0;
width = ctx->sx;
} else if (wp->xoff < ctx->ox) {
/* Left not visible. */
i = ctx->ox - wp->xoff;
x = 0;
width = wp->sx - i;
} else {
/* Right not visible. */
i = 0;
x = wp->xoff - ctx->ox;
width = ctx->sx - x;
}
log_debug("%s: %s %%%u line %u,%u at %u,%u, width %u",
__func__, c->name, wp->id, i, j, x, y, width);

tty_default_colours(&defaults, wp);
tty_draw_line(tty, s, i, j, width, x, y, &defaults, palette);
}

#ifdef ENABLE_SIXEL
tty_draw_images(c, wp, s);
#endif
}