/src/tmux/screen-redraw.c

Source
/* $OpenBSD$ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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 *);
static void screen_redraw_draw_pane_scrollbars(struct screen_redraw_ctx *);
static void screen_redraw_draw_scrollbar(struct screen_redraw_ctx *,
        struct window_pane *, int, int, int, u_int, u_int, u_int);
static void screen_redraw_draw_pane_scrollbar(struct screen_redraw_ctx *,
        struct window_pane *);

#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;
  case PANE_LINES_SPACES:
    gc->attr &= ~GRID_ATTR_CHARSET;
    utf8_set(&gc->data, ' ');
    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;
  u_int    ex = wp->xoff + wp->sx, ey = wp->yoff + wp->sy;
  int    hsplit = 0, vsplit = 0, pane_status = ctx->pane_status;
  int    pane_scrollbars = ctx->pane_scrollbars, sb_w = 0;
  int    sb_pos;

  if (pane_scrollbars != 0)
    sb_pos = ctx->pane_scrollbars_pos;
  else
    sb_pos = 0;

  /* 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:
    hsplit = screen_redraw_two_panes(wp->window, 0);
    vsplit = screen_redraw_two_panes(wp->window, 1);
    break;
  }

  /* Are scrollbars enabled? */
  if (window_pane_show_scrollbar(wp, pane_scrollbars))
    sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;

  /*
   * Left/right borders. The wp->sy / 2 test is to colour only half the
   * active window's border when there are two panes.
   */
  if ((wp->yoff == 0 || py >= wp->yoff - 1) && py <= ey) {
    if (sb_pos == PANE_SCROLLBARS_LEFT) {
      if (wp->xoff - sb_w == 0 && px == wp->sx + sb_w)
        if (!hsplit || (hsplit && py <= wp->sy / 2))
          return (SCREEN_REDRAW_BORDER_RIGHT);
      if (wp->xoff - sb_w != 0) {
        if (px == wp->xoff - sb_w - 1 &&
            (!hsplit || (hsplit && py > wp->sy / 2)))
          return (SCREEN_REDRAW_BORDER_LEFT);
        if (px == wp->xoff + wp->sx + sb_w - 1)
          return (SCREEN_REDRAW_BORDER_RIGHT);
      }
    } else { /* sb_pos == PANE_SCROLLBARS_RIGHT or disabled */
      if (wp->xoff == 0 && px == wp->sx + sb_w)
        if (!hsplit || (hsplit && py <= wp->sy / 2))
          return (SCREEN_REDRAW_BORDER_RIGHT);
      if (wp->xoff != 0) {
        if (px == wp->xoff - 1 &&
            (!hsplit || (hsplit && py > wp->sy / 2)))
          return (SCREEN_REDRAW_BORDER_LEFT);
        if (px == wp->xoff + wp->sx + sb_w)
          return (SCREEN_REDRAW_BORDER_RIGHT);
      }
    }
  }

  /* Top/bottom borders. */
  if (vsplit && pane_status == PANE_STATUS_OFF && sb_w == 0) {
    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 (sb_pos == PANE_SCROLLBARS_LEFT) {
      if ((wp->xoff - sb_w == 0 || px >= wp->xoff - sb_w) &&
          (px <= ex || (sb_w != 0 && px < ex + sb_w))) {
        if (wp->yoff != 0 && py == wp->yoff - 1)
          return (SCREEN_REDRAW_BORDER_TOP);
        if (py == ey)
          return (SCREEN_REDRAW_BORDER_BOTTOM);
      }
    } else { /* sb_pos == PANE_SCROLLBARS_RIGHT */
      if ((wp->xoff == 0 || px >= wp->xoff) &&
          (px <= ex || (sb_w != 0 && px < ex + sb_w))) {
        if (pane_status != PANE_STATUS_BOTTOM &&
            wp->yoff != 0 &&
            py == wp->yoff - 1)
          return (SCREEN_REDRAW_BORDER_TOP);
        if (pane_status != PANE_STATUS_TOP && 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;
  u_int      sy = w->sy;

  if (ctx->pane_status == PANE_STATUS_BOTTOM)
    sy--;

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

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

  if (pane_status == PANE_STATUS_BOTTOM)
    sy--;

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

  /*
   * Construct a bitmask of whether the cells to the left (bit 8), right,
   * top, and bottom (bit 1) of this cell are borders.
   *
   * bits 8 4 2 1:     2
   *       8 + 4
   *         1
   */
  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 &&
        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;
  u_int      sx = w->sx, sy = w->sy;
  int      border, pane_scrollbars = ctx->pane_scrollbars;
  u_int      right, line;
  int      sb_pos = ctx->pane_scrollbars_pos;
  int      sb_w;

  *wpp = NULL;

  if (px > sx || py > sy)
    return (CELL_OUTSIDE);
  if (px == sx || py == 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 + 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;

    /* Check if CELL_SCROLLBAR */
    if (window_pane_show_scrollbar(wp, pane_scrollbars)) {
      if (pane_status == PANE_STATUS_TOP)
        line = wp->yoff - 1;
      else
        line = wp->yoff + wp->sy;

      /*
       * Check if py could lie within a scrollbar. If the
       * pane is at the top then py == 0 to sy; if the pane
       * is not at the top, then yoff to yoff + sy.
       */
      sb_w = wp->scrollbar_style.width +
          wp->scrollbar_style.pad;
      if ((pane_status && py != line) ||
          (wp->yoff == 0 && py < wp->sy) ||
           (py >= wp->yoff && py < wp->yoff + wp->sy)) {
        /* Check if px lies within a scrollbar. */
        if ((sb_pos == PANE_SCROLLBARS_RIGHT &&
             (px >= wp->xoff + wp->sx &&
              px < wp->xoff + wp->sx + sb_w)) ||
            (sb_pos == PANE_SCROLLBARS_LEFT &&
             (px >= wp->xoff - sb_w &&
              px < wp->xoff)))
          return (CELL_SCROLLBAR);
      }
    }

    /*
     * 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, sb_w = 0;
  int      pane_scrollbars = rctx->pane_scrollbars;
  u_int      width, i, cell_type, px, py;
  struct screen_write_ctx  ctx;
  struct screen    old;

  if (window_pane_show_scrollbar(wp, pane_scrollbars))
    sb_w = wp->scrollbar_style.width + wp->scrollbar_style.pad;

  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 + sb_w - 2;

  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 screen_redraw_ctx *ctx, uint64_t flags)
{
  struct client     *c = ctx->c;
  struct window     *w = c->session->curw->window;
  struct window_pane    *wp;
  int        redraw;
  enum pane_lines      lines;

  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 (ctx->pane_status != PANE_STATUS_OFF) {
    lines = ctx->pane_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");

  ctx->pane_scrollbars = options_get_number(wo, "pane-scrollbars");
  ctx->pane_scrollbars_pos = options_get_number(wo,
      "pane-scrollbars-position");

  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;

  screen_redraw_set_context(c, &ctx);

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

  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);
    screen_redraw_draw_borders(&ctx);
    if (ctx.pane_status != PANE_STATUS_OFF)
      screen_redraw_draw_pane_status(&ctx);
    screen_redraw_draw_pane_scrollbars(&ctx);
  }
  if (flags & CLIENT_REDRAWWINDOW) {
    log_debug("%s: redrawing panes", c->name);
    screen_redraw_draw_panes(&ctx);
    screen_redraw_draw_pane_scrollbars(&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 and its scrollbar. */
void
screen_redraw_pane(struct client *c, struct window_pane *wp,
    int redraw_scrollbar_only)
{
  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);

  if (!redraw_scrollbar_only)
    screen_redraw_draw_pane(&ctx, wp);

  if (window_pane_show_scrollbar(wp, ctx.pane_scrollbars))
    screen_redraw_draw_pane_scrollbar(&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 arrow indicator if enabled. */
static void
screen_redraw_draw_border_arrows(struct screen_redraw_ctx *ctx, u_int i,
    u_int j, u_int cell_type, struct window_pane *wp,
    struct window_pane *active, struct grid_cell *gc)
{
  struct client   *c = ctx->c;
  struct session    *s = c->session;
  struct window   *w = s->curw->window;
  struct options    *oo = w->options;
  u_int      x = ctx->ox + i, y = ctx->oy + j;
  int      value, arrows = 0, border;

  if (wp == NULL)
    return;
  if (i != wp->xoff + 1 && j != wp->yoff + 1)
    return;

  value = options_get_number(oo, "pane-border-indicators");
  if (value != PANE_BORDER_ARROWS && value != PANE_BORDER_BOTH)
    return;

  border = screen_redraw_pane_border(ctx, active, x, y);
  if (border == SCREEN_REDRAW_INSIDE)
    return;

  if (i == wp->xoff + 1) {
    if (border == SCREEN_REDRAW_OUTSIDE) {
      if (screen_redraw_two_panes(wp->window, 1)) {
        if (active == TAILQ_FIRST(&w->panes))
          border = SCREEN_REDRAW_BORDER_BOTTOM;
        else
          border = SCREEN_REDRAW_BORDER_TOP;
        arrows = 1;
      }
    } else {
      if (cell_type == CELL_LEFTRIGHT)
        arrows = 1;
      else if (cell_type == CELL_TOPJOIN &&
          border == SCREEN_REDRAW_BORDER_BOTTOM)
        arrows = 1;
      else if (cell_type == CELL_BOTTOMJOIN &&
          border == SCREEN_REDRAW_BORDER_TOP)
        arrows = 1;
    }
  }
  if (j == wp->yoff + 1) {
    if (border == SCREEN_REDRAW_OUTSIDE) {
      if (screen_redraw_two_panes(wp->window, 0)) {
        if (active == TAILQ_FIRST(&w->panes))
          border = SCREEN_REDRAW_BORDER_RIGHT;
        else
          border = SCREEN_REDRAW_BORDER_LEFT;
        arrows = 1;
      }
    } else {
      if (cell_type == CELL_TOPBOTTOM)
        arrows = 1;
      else if (cell_type == CELL_LEFTJOIN &&
          border == SCREEN_REDRAW_BORDER_RIGHT)
        arrows = 1;
      else if (cell_type == CELL_RIGHTJOIN &&
          border == SCREEN_REDRAW_BORDER_LEFT)
        arrows = 1;
    }
  }
  if (arrows) {
    gc->attr |= GRID_ATTR_CHARSET;
    utf8_set(&gc->data, BORDER_MARKERS[border]);
  }
}

/* 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      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 || cell_type == CELL_SCROLLBAR)
    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);

  screen_redraw_draw_border_arrows(ctx, i, j, cell_type, wp, active, &gc);

  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;

  if (wp->base.mode & MODE_SYNC)
    screen_write_stop_sync(wp);

  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
}

/* Draw the panes scrollbars */
static void
screen_redraw_draw_pane_scrollbars(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_show_scrollbar(wp, ctx->pane_scrollbars) &&
        window_pane_visible(wp))
      screen_redraw_draw_pane_scrollbar(ctx, wp);
  }
}

/* Draw pane scrollbar. */
void
screen_redraw_draw_pane_scrollbar(struct screen_redraw_ctx *ctx,
    struct window_pane *wp)
{
  struct screen *s = wp->screen;
  double     percent_view;
  u_int    sb = ctx->pane_scrollbars, total_height, sb_h = wp->sy;
  u_int    sb_pos = ctx->pane_scrollbars_pos, slider_h, slider_y;
  int    sb_w = wp->scrollbar_style.width;
  int    sb_pad = wp->scrollbar_style.pad;
  int    cm_y, cm_size, xoff = wp->xoff, ox = ctx->ox;
  int    sb_x, sb_y = (int)(wp->yoff - ctx->oy); /* sb top */

  if (window_pane_mode(wp) == WINDOW_PANE_NO_MODE) {
    if (sb == PANE_SCROLLBARS_MODAL)
      return;
    /* Show slider at the bottom of the scrollbar. */
    total_height = screen_size_y(s) + screen_hsize(s);
    percent_view = (double)sb_h / total_height;
    slider_h = (double)sb_h * percent_view;
    slider_y = sb_h - slider_h;
  } else {
    if (TAILQ_FIRST(&wp->modes) == NULL)
      return;
    if (window_copy_get_current_offset(wp, &cm_y, &cm_size) == 0)
      return;
    total_height = cm_size + sb_h;
    percent_view = (double)sb_h / (cm_size + sb_h);
    slider_h = (double)sb_h * percent_view;
    slider_y = (sb_h + 1) * ((double)cm_y / total_height);
  }

  if (sb_pos == PANE_SCROLLBARS_LEFT)
    sb_x = xoff - sb_w - sb_pad - ox;
  else
    sb_x = xoff + wp->sx - ox;

  if (slider_h < 1)
    slider_h = 1;
  if (slider_y >= sb_h)
    slider_y = sb_h - 1;

  screen_redraw_draw_scrollbar(ctx, wp, sb_pos, sb_x, sb_y, sb_h,
      slider_h, slider_y);

  /* Store current position and height of the slider */
  wp->sb_slider_y = slider_y;  /* top of slider y pos in scrollbar */
  wp->sb_slider_h = slider_h;  /* height of slider */
}

static void
screen_redraw_draw_scrollbar(struct screen_redraw_ctx *ctx,
    struct window_pane *wp, int sb_pos, int sb_x, int sb_y, u_int sb_h,
    u_int slider_h, u_int slider_y)
{
  struct client   *c = ctx->c;
  struct tty    *tty = &c->tty;
  struct grid_cell   gc, slgc, *gcp;
  struct style    *sb_style = &wp->scrollbar_style;
  u_int      i, j, imax, jmax;
  u_int      sb_w = sb_style->width, sb_pad = sb_style->pad;
  int      px, py, ox = ctx->ox, oy = ctx->oy;
  int      sx = ctx->sx, sy = ctx->sy, xoff = wp->xoff;
  int      yoff = wp->yoff;

  if (ctx->statustop) {
    sb_y += ctx->statuslines;
    sy += ctx->statuslines;
  }

  /* Set up style for slider. */
  gc = sb_style->gc;
  memcpy(&slgc, &gc, sizeof slgc);
  slgc.fg = gc.bg;
  slgc.bg = gc.fg;

  imax = sb_w + sb_pad;
  if ((int)imax + sb_x > sx)
    imax = sx - sb_x;
  jmax = sb_h;
  if ((int)jmax + sb_y > sy)
    jmax = sy - sb_y;

  for (j = 0; j < jmax; j++) {
    py = sb_y + j;
    for (i = 0; i < imax; i++) {
      px = sb_x + i;
      if (px < xoff - ox - (int)sb_w - (int)sb_pad ||
          px >= sx || px < 0 ||
          py < yoff - oy - 1 ||
          py >= sy || py < 0)
        continue;
      tty_cursor(tty, px, py);
      if ((sb_pos == PANE_SCROLLBARS_LEFT &&
          i >= sb_w && i < sb_w + sb_pad) ||
          (sb_pos == PANE_SCROLLBARS_RIGHT &&
           i < sb_pad)) {
        tty_cell(tty, &grid_default_cell,
            &grid_default_cell, NULL, NULL);
      } else {
        if (j >= slider_y && j < slider_y + slider_h)
          gcp = &slgc;
        else
          gcp = &gc;
        tty_cell(tty, gcp, &grid_default_cell, NULL,
            NULL);
      }
    }
  }
}

Coverage Report

Created: 2026-01-17 06:24