OpenBSD-4.6/usr.bin/tmux/screen.c
/* $OpenBSD: screen.c,v 1.5 2009/06/24 22:51:47 nicm Exp $ */
/*
* Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
*
* 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 <vis.h>
#include "tmux.h"
void screen_resize_x(struct screen *, u_int);
void screen_resize_y(struct screen *, u_int);
/* Create a new screen. */
void
screen_init(struct screen *s, u_int sx, u_int sy, u_int hlimit)
{
s->grid = grid_create(sx, sy, hlimit);
s->title = xstrdup("");
s->tabs = NULL;
screen_reinit(s);
}
/* Reinitialise screen. */
void
screen_reinit(struct screen *s)
{
s->cx = 0;
s->cy = 0;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
s->mode = MODE_CURSOR;
screen_reset_tabs(s);
grid_clear_lines(s->grid, s->grid->hsize, s->grid->sy - 1);
screen_clear_selection(s);
}
/* Destroy a screen. */
void
screen_free(struct screen *s)
{
xfree(s->title);
grid_destroy(s->grid);
}
/* Reset tabs to default, eight spaces apart. */
void
screen_reset_tabs(struct screen *s)
{
u_int i;
if (s->tabs != NULL)
xfree(s->tabs);
if ((s->tabs = bit_alloc(screen_size_x(s))) == NULL)
fatal("bit_alloc failed");
for (i = 8; i < screen_size_x(s); i += 8)
bit_set(s->tabs, i);
}
/* Set screen title. */
void
screen_set_title(struct screen *s, const char *title)
{
char tmp[BUFSIZ];
strnvis(tmp, title, sizeof tmp, VIS_OCTAL|VIS_TAB|VIS_NL);
xfree(s->title);
s->title = xstrdup(tmp);
}
/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy)
{
if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
if (sx != screen_size_x(s)) {
screen_resize_x(s, sx);
/*
* It is unclear what should happen to tabs on resize. xterm
* seems to try and maintain them, rxvt resets them. Resetting
* is simpler and more reliable so let's do that.
*/
screen_reset_tabs(s);
}
if (sy != screen_size_y(s))
screen_resize_y(s, sy);
}
void
screen_resize_x(struct screen *s, u_int sx)
{
struct grid *gd = s->grid;
const struct grid_cell *gc;
const struct grid_utf8 *gu;
u_int xx, yy;
if (sx == 0)
fatalx("zero size");
/* If getting larger, not much to do. */
if (sx > screen_size_x(s)) {
gd->sx = sx;
return;
}
/* If getting smaller, nuke any data in lines over the new size. */
for (yy = gd->hsize; yy < gd->hsize + screen_size_y(s); yy++) {
/*
* If the character after the last is wide or padding, remove
* it and any leading padding.
*/
gc = &grid_default_cell;
for (xx = sx; xx > 0; xx--) {
gc = grid_peek_cell(gd, xx - 1, yy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
grid_set_cell(gd, xx - 1, yy, &grid_default_cell);
}
if (xx > 0 && xx != sx && gc->flags & GRID_FLAG_UTF8) {
gu = grid_peek_utf8(gd, xx - 1, yy);
if (gu->width > 1) {
grid_set_cell(
gd, xx - 1, yy, &grid_default_cell);
}
}
/* Reduce the line size. */
grid_reduce_line(gd, yy, sx);
}
if (s->cx >= sx)
s->cx = sx - 1;
gd->sx = sx;
}
void
screen_resize_y(struct screen *s, u_int sy)
{
struct grid *gd = s->grid;
u_int needed, available, oldy, i;
if (sy == 0)
fatalx("zero size");
oldy = screen_size_y(s);
/*
* When resizing:
*
* If the height is decreasing, delete lines from the bottom until
* hitting the cursor, then push lines from the top into the history.
*
* When increasing, pull as many lines as possible from the history to
* the top, then fill the remaining with blanks at the bottom.
*/
/* Size decreasing. */
if (sy < oldy) {
needed = oldy - sy;
/* Delete as many lines as possible from the bottom. */
available = oldy - 1 - s->cy;
if (available > 0) {
if (available > needed)
available = needed;
grid_view_delete_lines(gd, oldy - available, available);
}
needed -= available;
/*
* Now just increase the history size to take over the lines
* which are left. XXX Should apply history limit?
*/
gd->hsize += needed;
s->cy -= needed;
}
/* Resize line arrays. */
gd->size = xrealloc(gd->size, gd->hsize + sy, sizeof *gd->size);
gd->data = xrealloc(gd->data, gd->hsize + sy, sizeof *gd->data);
gd->usize = xrealloc(gd->usize, gd->hsize + sy, sizeof *gd->usize);
gd->udata = xrealloc(gd->udata, gd->hsize + sy, sizeof *gd->udata);
/* Size increasing. */
if (sy > oldy) {
needed = sy - oldy;
/* Try to pull as much as possible out of the history. */
available = gd->hsize;
if (available > 0) {
if (available > needed)
available = needed;
gd->hsize -= available;
s->cy += available;
}
needed -= available;
/* Then fill the rest in with blanks. */
for (i = gd->hsize + sy - needed; i < gd->hsize + sy; i++) {
gd->size[i] = 0;
gd->data[i] = NULL;
gd->usize[i] = 0;
gd->udata[i] = NULL;
}
}
/* Set the new size, and reset the scroll region. */
gd->sy = sy;
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
}
/* Set selection. */
void
screen_set_selection(struct screen *s,
u_int sx, u_int sy, u_int ex, u_int ey, struct grid_cell *gc)
{
struct screen_sel *sel = &s->sel;
memcpy(&sel->cell, gc, sizeof sel->cell);
sel->flag = 1;
if (ey < sy || (sy == ey && ex < sx)) {
sel->sx = ex; sel->sy = ey;
sel->ex = sx; sel->ey = sy;
} else {
sel->sx = sx; sel->sy = sy;
sel->ex = ex; sel->ey = ey;
}
}
/* Clear selection. */
void
screen_clear_selection(struct screen *s)
{
struct screen_sel *sel = &s->sel;
sel->flag = 0;
}
/* Check if cell in selection. */
int
screen_check_selection(struct screen *s, u_int px, u_int py)
{
struct screen_sel *sel = &s->sel;
if (!sel->flag || py < sel->sy || py > sel->ey)
return (0);
if (py == sel->sy && py == sel->ey) {
if (px < sel->sx || px > sel->ex)
return (0);
return (1);
}
if ((py == sel->sy && px < sel->sx) || (py == sel->ey && px > sel->ex))
return (0);
return (1);
}