tmux/screen-write.c
nicm bbd6e899a8 There is no point allocating a new item and putting it on the list when
the whole line is cleared line, there is never any point in doing it
more than once. Instead store the background colour alone.
2020-04-17 15:44:58 +00:00

1809 lines
42 KiB
C

/* $OpenBSD$ */
/*
* 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_write_collect_clear(struct screen_write_ctx *, u_int,
u_int);
static int screen_write_collect_clear_end(struct screen_write_ctx *, u_int,
u_int, u_int);
static int screen_write_collect_clear_start(struct screen_write_ctx *, u_int,
u_int, u_int);
static void screen_write_collect_scroll(struct screen_write_ctx *);
static void screen_write_collect_flush(struct screen_write_ctx *, int,
const char *);
static int screen_write_overwrite(struct screen_write_ctx *,
struct grid_cell *, u_int);
static const struct grid_cell *screen_write_combine(struct screen_write_ctx *,
const struct utf8_data *, u_int *);
static const struct grid_cell screen_write_pad_cell = {
{ { 0 }, 0, 0, 0 }, 0, GRID_FLAG_PADDING, 0, 8, 8
};
struct screen_write_collect_item {
u_int x;
int wrapped;
enum { TEXT, CLEAR_END, CLEAR_START } type;
u_int used;
union {
u_int bg;
char data[256];
};
struct grid_cell gc;
TAILQ_ENTRY(screen_write_collect_item) entry;
};
struct screen_write_collect_line {
u_int bg;
TAILQ_HEAD(, screen_write_collect_item) items;
};
static void
screen_write_offset_timer(__unused int fd, __unused short events, void *data)
{
struct window *w = data;
tty_update_window_offset(w);
}
/* Set cursor position. */
static void
screen_write_set_cursor(struct screen_write_ctx *ctx, int cx, int cy)
{
struct window_pane *wp = ctx->wp;
struct window *w;
struct screen *s = ctx->s;
struct timeval tv = { .tv_usec = 10000 };
if (cx != -1 && (u_int)cx == s->cx && cy != -1 && (u_int)cy == s->cy)
return;
if (cx != -1) {
if ((u_int)cx > screen_size_x(s)) /* allow last column */
cx = screen_size_x(s) - 1;
s->cx = cx;
}
if (cy != -1) {
if ((u_int)cy > screen_size_y(s) - 1)
cy = screen_size_y(s) - 1;
s->cy = cy;
}
if (wp == NULL)
return;
w = wp->window;
if (!event_initialized(&w->offset_timer))
evtimer_set(&w->offset_timer, screen_write_offset_timer, w);
if (!evtimer_pending(&w->offset_timer, NULL))
evtimer_add(&w->offset_timer, &tv);
}
/* Set up context for TTY command. */
static void
screen_write_initctx(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx,
int sync)
{
struct screen *s = ctx->s;
memset(ttyctx, 0, sizeof *ttyctx);
ttyctx->wp = ctx->wp;
ttyctx->ocx = s->cx;
ttyctx->ocy = s->cy;
ttyctx->orlower = s->rlower;
ttyctx->orupper = s->rupper;
if (sync && !ctx->sync && ttyctx->wp != NULL) {
log_debug("%s: starting sync", __func__);
tty_write(tty_cmd_syncstart, ttyctx);
ctx->sync = 1;
}
}
/* Initialize writing with a window. */
void
screen_write_start(struct screen_write_ctx *ctx, struct window_pane *wp,
struct screen *s)
{
u_int y;
memset(ctx, 0, sizeof *ctx);
ctx->wp = wp;
if (wp != NULL && s == NULL)
ctx->s = wp->screen;
else
ctx->s = s;
ctx->list = xcalloc(screen_size_y(ctx->s), sizeof *ctx->list);
for (y = 0; y < screen_size_y(ctx->s); y++)
TAILQ_INIT(&ctx->list[y].items);
ctx->item = xcalloc(1, sizeof *ctx->item);
ctx->scrolled = 0;
ctx->bg = 8;
if (log_get_level() != 0) {
if (wp != NULL) {
log_debug("%s: size %ux%u, pane %%%u (at %u,%u)",
__func__, screen_size_x(ctx->s),
screen_size_y(ctx->s), wp->id, wp->xoff, wp->yoff);
} else {
log_debug("%s: size %ux%u, no pane",
__func__, screen_size_x(ctx->s),
screen_size_y(ctx->s));
}
}
}
/* Finish writing. */
void
screen_write_stop(struct screen_write_ctx *ctx)
{
struct tty_ctx ttyctx;
screen_write_collect_end(ctx);
screen_write_collect_flush(ctx, 0, __func__);
log_debug("%s: %u cells (%u written, %u skipped)", __func__,
ctx->cells, ctx->written, ctx->skipped);
if (ctx->sync) {
screen_write_initctx(ctx, &ttyctx, 0);
tty_write(tty_cmd_syncend, &ttyctx);
log_debug("%s: ending sync", __func__);
}
free(ctx->item);
free(ctx->list); /* flush will have emptied */
}
/* Reset screen state. */
void
screen_write_reset(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
screen_reset_tabs(s);
screen_write_scrollregion(ctx, 0, screen_size_y(s) - 1);
s->mode = MODE_CURSOR | MODE_WRAP;
screen_write_clearscreen(ctx, 8);
screen_write_set_cursor(ctx, 0, 0);
}
/* Write character. */
void
screen_write_putc(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
u_char ch)
{
struct grid_cell gc;
memcpy(&gc, gcp, sizeof gc);
utf8_set(&gc.data, ch);
screen_write_cell(ctx, &gc);
}
/* Calculate string length. */
size_t
screen_write_strlen(const char *fmt, ...)
{
va_list ap;
char *msg;
struct utf8_data ud;
u_char *ptr;
size_t left, size = 0;
enum utf8_state more;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
ptr = msg;
while (*ptr != '\0') {
if (*ptr > 0x7f && utf8_open(&ud, *ptr) == UTF8_MORE) {
ptr++;
left = strlen(ptr);
if (left < (size_t)ud.size - 1)
break;
while ((more = utf8_append(&ud, *ptr)) == UTF8_MORE)
ptr++;
ptr++;
if (more == UTF8_DONE)
size += ud.width;
} else {
if (*ptr > 0x1f && *ptr < 0x7f)
size++;
ptr++;
}
}
free(msg);
return (size);
}
/* Write simple string (no UTF-8 or maximum length). */
void
screen_write_puts(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
screen_write_vnputs(ctx, -1, gcp, fmt, ap);
va_end(ap);
}
/* Write string with length limit (-1 for unlimited). */
void
screen_write_nputs(struct screen_write_ctx *ctx, ssize_t maxlen,
const struct grid_cell *gcp, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
screen_write_vnputs(ctx, maxlen, gcp, fmt, ap);
va_end(ap);
}
void
screen_write_vnputs(struct screen_write_ctx *ctx, ssize_t maxlen,
const struct grid_cell *gcp, const char *fmt, va_list ap)
{
struct grid_cell gc;
struct utf8_data *ud = &gc.data;
char *msg;
u_char *ptr;
size_t left, size = 0;
enum utf8_state more;
memcpy(&gc, gcp, sizeof gc);
xvasprintf(&msg, fmt, ap);
ptr = msg;
while (*ptr != '\0') {
if (*ptr > 0x7f && utf8_open(ud, *ptr) == UTF8_MORE) {
ptr++;
left = strlen(ptr);
if (left < (size_t)ud->size - 1)
break;
while ((more = utf8_append(ud, *ptr)) == UTF8_MORE)
ptr++;
ptr++;
if (more != UTF8_DONE)
continue;
if (maxlen > 0 && size + ud->width > (size_t)maxlen) {
while (size < (size_t)maxlen) {
screen_write_putc(ctx, &gc, ' ');
size++;
}
break;
}
size += ud->width;
screen_write_cell(ctx, &gc);
} else {
if (maxlen > 0 && size + 1 > (size_t)maxlen)
break;
if (*ptr == '\001')
gc.attr ^= GRID_ATTR_CHARSET;
else if (*ptr > 0x1f && *ptr < 0x7f) {
size++;
screen_write_putc(ctx, &gc, *ptr);
}
ptr++;
}
}
free(msg);
}
/* Copy from another screen. Assumes target region is big enough. */
void
screen_write_copy(struct screen_write_ctx *ctx, struct screen *src, u_int px,
u_int py, u_int nx, u_int ny, bitstr_t *mbs, const struct grid_cell *mgc)
{
struct screen *s = ctx->s;
struct grid *gd = src->grid;
struct grid_cell gc;
u_int xx, yy, cx, cy, b;
if (nx == 0 || ny == 0)
return;
cx = s->cx;
cy = s->cy;
for (yy = py; yy < py + ny; yy++) {
for (xx = px; xx < px + nx; xx++) {
grid_get_cell(gd, xx, yy, &gc);
if (mbs != NULL) {
b = (yy * screen_size_x(src)) + xx;
if (bit_test(mbs, b)) {
gc.attr = mgc->attr;
gc.fg = mgc->fg;
gc.bg = mgc->bg;
}
}
if (xx + gc.data.width <= px + nx)
screen_write_cell(ctx, &gc);
}
cy++;
screen_write_set_cursor(ctx, cx, cy);
}
}
/*
* Copy from another screen but without the selection stuff. Also assumes the
* target region is already big enough.
*/
void
screen_write_fast_copy(struct screen_write_ctx *ctx, struct screen *src,
u_int px, u_int py, u_int nx, u_int ny)
{
struct screen *s = ctx->s;
struct grid *gd = src->grid;
struct grid_cell gc;
u_int xx, yy, cx, cy;
if (nx == 0 || ny == 0)
return;
cy = s->cy;
for (yy = py; yy < py + ny; yy++) {
if (yy >= gd->hsize + gd->sy)
break;
cx = s->cx;
for (xx = px; xx < px + nx; xx++) {
if (xx >= grid_get_line(gd, yy)->cellsize)
break;
grid_get_cell(gd, xx, yy, &gc);
if (xx + gc.data.width > px + nx)
break;
grid_view_set_cell(ctx->s->grid, cx, cy, &gc);
cx++;
}
cy++;
}
}
/* Draw a horizontal line on screen. */
void
screen_write_hline(struct screen_write_ctx *ctx, u_int nx, int left, int right)
{
struct screen *s = ctx->s;
struct grid_cell gc;
u_int cx, cy, i;
cx = s->cx;
cy = s->cy;
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.attr |= GRID_ATTR_CHARSET;
screen_write_putc(ctx, &gc, left ? 't' : 'q');
for (i = 1; i < nx - 1; i++)
screen_write_putc(ctx, &gc, 'q');
screen_write_putc(ctx, &gc, right ? 'u' : 'q');
screen_write_set_cursor(ctx, cx, cy);
}
/* Draw a horizontal line on screen. */
void
screen_write_vline(struct screen_write_ctx *ctx, u_int ny, int top, int bottom)
{
struct screen *s = ctx->s;
struct grid_cell gc;
u_int cx, cy, i;
cx = s->cx;
cy = s->cy;
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.attr |= GRID_ATTR_CHARSET;
screen_write_putc(ctx, &gc, top ? 'w' : 'x');
for (i = 1; i < ny - 1; i++) {
screen_write_set_cursor(ctx, cx, cy + i);
screen_write_putc(ctx, &gc, 'x');
}
screen_write_set_cursor(ctx, cx, cy + ny - 1);
screen_write_putc(ctx, &gc, bottom ? 'v' : 'x');
screen_write_set_cursor(ctx, cx, cy);
}
/* Draw a menu on screen. */
void
screen_write_menu(struct screen_write_ctx *ctx, struct menu *menu,
int choice, const struct grid_cell *choice_gc)
{
struct screen *s = ctx->s;
struct grid_cell default_gc;
const struct grid_cell *gc = &default_gc;
u_int cx, cy, i, j;
const char *name;
cx = s->cx;
cy = s->cy;
memcpy(&default_gc, &grid_default_cell, sizeof default_gc);
screen_write_box(ctx, menu->width + 4, menu->count + 2);
screen_write_cursormove(ctx, cx + 2, cy, 0);
format_draw(ctx, &default_gc, menu->width, menu->title, NULL);
for (i = 0; i < menu->count; i++) {
name = menu->items[i].name;
if (name == NULL) {
screen_write_cursormove(ctx, cx, cy + 1 + i, 0);
screen_write_hline(ctx, menu->width + 4, 1, 1);
} else {
if (choice >= 0 && i == (u_int)choice && *name != '-')
gc = choice_gc;
screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0);
for (j = 0; j < menu->width; j++)
screen_write_putc(ctx, gc, ' ');
screen_write_cursormove(ctx, cx + 2, cy + 1 + i, 0);
if (*name == '-') {
name++;
default_gc.attr |= GRID_ATTR_DIM;
format_draw(ctx, gc, menu->width, name, NULL);
default_gc.attr &= ~GRID_ATTR_DIM;
} else
format_draw(ctx, gc, menu->width, name, NULL);
gc = &default_gc;
}
}
screen_write_set_cursor(ctx, cx, cy);
}
/* Draw a box on screen. */
void
screen_write_box(struct screen_write_ctx *ctx, u_int nx, u_int ny)
{
struct screen *s = ctx->s;
struct grid_cell gc;
u_int cx, cy, i;
cx = s->cx;
cy = s->cy;
memcpy(&gc, &grid_default_cell, sizeof gc);
gc.attr |= GRID_ATTR_CHARSET;
screen_write_putc(ctx, &gc, 'l');
for (i = 1; i < nx - 1; i++)
screen_write_putc(ctx, &gc, 'q');
screen_write_putc(ctx, &gc, 'k');
screen_write_set_cursor(ctx, cx, cy + ny - 1);
screen_write_putc(ctx, &gc, 'm');
for (i = 1; i < nx - 1; i++)
screen_write_putc(ctx, &gc, 'q');
screen_write_putc(ctx, &gc, 'j');
for (i = 1; i < ny - 1; i++) {
screen_write_set_cursor(ctx, cx, cy + i);
screen_write_putc(ctx, &gc, 'x');
}
for (i = 1; i < ny - 1; i++) {
screen_write_set_cursor(ctx, cx + nx - 1, cy + i);
screen_write_putc(ctx, &gc, 'x');
}
screen_write_set_cursor(ctx, cx, cy);
}
/*
* Write a preview version of a window. Assumes target area is big enough and
* already cleared.
*/
void
screen_write_preview(struct screen_write_ctx *ctx, struct screen *src, u_int nx,
u_int ny)
{
struct screen *s = ctx->s;
struct grid_cell gc;
u_int cx, cy, px, py;
cx = s->cx;
cy = s->cy;
/*
* If the cursor is on, pick the area around the cursor, otherwise use
* the top left.
*/
if (src->mode & MODE_CURSOR) {
px = src->cx;
if (px < nx / 3)
px = 0;
else
px = px - nx / 3;
if (px + nx > screen_size_x(src)) {
if (nx > screen_size_x(src))
px = 0;
else
px = screen_size_x(src) - nx;
}
py = src->cy;
if (py < ny / 3)
py = 0;
else
py = py - ny / 3;
if (py + ny > screen_size_y(src)) {
if (ny > screen_size_y(src))
py = 0;
else
py = screen_size_y(src) - ny;
}
} else {
px = 0;
py = 0;
}
screen_write_fast_copy(ctx, src, px, src->grid->hsize + py, nx, ny);
if (src->mode & MODE_CURSOR) {
grid_view_get_cell(src->grid, src->cx, src->cy, &gc);
gc.attr |= GRID_ATTR_REVERSE;
screen_write_set_cursor(ctx, cx + (src->cx - px),
cy + (src->cy - py));
screen_write_cell(ctx, &gc);
}
}
/* Set a mode. */
void
screen_write_mode_set(struct screen_write_ctx *ctx, int mode)
{
struct screen *s = ctx->s;
s->mode |= mode;
}
/* Clear a mode. */
void
screen_write_mode_clear(struct screen_write_ctx *ctx, int mode)
{
struct screen *s = ctx->s;
s->mode &= ~mode;
}
/* Cursor up by ny. */
void
screen_write_cursorup(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
u_int cx = s->cx, cy = s->cy;
if (ny == 0)
ny = 1;
if (cy < s->rupper) {
/* Above region. */
if (ny > cy)
ny = cy;
} else {
/* Below region. */
if (ny > cy - s->rupper)
ny = cy - s->rupper;
}
if (cx == screen_size_x(s))
cx--;
cy -= ny;
screen_write_set_cursor(ctx, cx, cy);
}
/* Cursor down by ny. */
void
screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
u_int cx = s->cx, cy = s->cy;
if (ny == 0)
ny = 1;
if (cy > s->rlower) {
/* Below region. */
if (ny > screen_size_y(s) - 1 - cy)
ny = screen_size_y(s) - 1 - cy;
} else {
/* Above region. */
if (ny > s->rlower - cy)
ny = s->rlower - cy;
}
if (cx == screen_size_x(s))
cx--;
else if (ny == 0)
return;
cy += ny;
screen_write_set_cursor(ctx, cx, cy);
}
/* Cursor right by nx. */
void
screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
u_int cx = s->cx, cy = s->cy;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - 1 - cx)
nx = screen_size_x(s) - 1 - cx;
if (nx == 0)
return;
cx += nx;
screen_write_set_cursor(ctx, cx, cy);
}
/* Cursor left by nx. */
void
screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
u_int cx = s->cx, cy = s->cy;
if (nx == 0)
nx = 1;
if (nx > cx)
nx = cx;
if (nx == 0)
return;
cx -= nx;
screen_write_set_cursor(ctx, cx, cy);
}
/* Backspace; cursor left unless at start of wrapped line when can move up. */
void
screen_write_backspace(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct grid_line *gl;
u_int cx = s->cx, cy = s->cy;
if (cx == 0) {
if (cy == 0)
return;
gl = grid_get_line(s->grid, s->grid->hsize + cy - 1);
if (gl->flags & GRID_LINE_WRAPPED) {
cy--;
cx = screen_size_x(s) - 1;
}
} else
cx--;
screen_write_set_cursor(ctx, cx, cy);
}
/* VT100 alignment test. */
void
screen_write_alignmenttest(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
struct grid_cell gc;
u_int xx, yy;
memcpy(&gc, &grid_default_cell, sizeof gc);
utf8_set(&gc.data, 'E');
for (yy = 0; yy < screen_size_y(s); yy++) {
for (xx = 0; xx < screen_size_x(s); xx++)
grid_view_set_cell(s->grid, xx, yy, &gc);
}
screen_write_set_cursor(ctx, 0, 0);
s->rupper = 0;
s->rlower = screen_size_y(s) - 1;
screen_write_initctx(ctx, &ttyctx, 1);
screen_write_collect_clear(ctx, 0, screen_size_y(s) - 1);
tty_write(tty_cmd_alignmenttest, &ttyctx);
}
/* Insert nx characters. */
void
screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - s->cx)
nx = screen_size_x(s) - s->cx;
if (nx == 0)
return;
if (s->cx > screen_size_x(s) - 1)
return;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.bg = bg;
grid_view_insert_cells(s->grid, s->cx, s->cy, nx, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = nx;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
/* Delete nx characters. */
void
screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - s->cx)
nx = screen_size_x(s) - s->cx;
if (nx == 0)
return;
if (s->cx > screen_size_x(s) - 1)
return;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.bg = bg;
grid_view_delete_cells(s->grid, s->cx, s->cy, nx, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = nx;
tty_write(tty_cmd_deletecharacter, &ttyctx);
}
/* Clear nx characters. */
void
screen_write_clearcharacter(struct screen_write_ctx *ctx, u_int nx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - s->cx)
nx = screen_size_x(s) - s->cx;
if (nx == 0)
return;
if (s->cx > screen_size_x(s) - 1)
return;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.bg = bg;
grid_view_clear(s->grid, s->cx, s->cy, nx, 1, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = nx;
tty_write(tty_cmd_clearcharacter, &ttyctx);
}
/* Insert ny lines. */
void
screen_write_insertline(struct screen_write_ctx *ctx, u_int ny, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper || s->cy > s->rlower) {
if (ny > screen_size_y(s) - s->cy)
ny = screen_size_y(s) - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
grid_view_insert_lines(gd, s->cy, ny, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = ny;
tty_write(tty_cmd_insertline, &ttyctx);
return;
}
if (ny > s->rlower + 1 - s->cy)
ny = s->rlower + 1 - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_insert_lines(gd, s->cy, ny, bg);
else
grid_view_insert_lines_region(gd, s->rlower, s->cy, ny, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = ny;
tty_write(tty_cmd_insertline, &ttyctx);
}
/* Delete ny lines. */
void
screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper || s->cy > s->rlower) {
if (ny > screen_size_y(s) - s->cy)
ny = screen_size_y(s) - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
grid_view_delete_lines(gd, s->cy, ny, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = ny;
tty_write(tty_cmd_deleteline, &ttyctx);
return;
}
if (ny > s->rlower + 1 - s->cy)
ny = s->rlower + 1 - s->cy;
if (ny == 0)
return;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_delete_lines(gd, s->cy, ny, bg);
else
grid_view_delete_lines_region(gd, s->rlower, s->cy, ny, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = ny;
tty_write(tty_cmd_deleteline, &ttyctx);
}
/* Clear line at cursor. */
void
screen_write_clearline(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct grid_line *gl;
u_int sx = screen_size_x(s);
gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
if (gl->cellsize == 0 && COLOUR_DEFAULT(bg))
return;
grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
screen_write_collect_clear(ctx, s->cy, 1);
ctx->list[s->cy].bg = 1 + bg;
ctx->item->used = 0;
}
/* Clear to end of line from cursor. */
void
screen_write_clearendofline(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct grid_line *gl;
u_int sx = screen_size_x(s);
struct screen_write_collect_item *ci = ctx->item;
if (s->cx == 0) {
screen_write_clearline(ctx, bg);
return;
}
gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
if (s->cx > sx - 1 || (s->cx >= gl->cellsize && COLOUR_DEFAULT(bg)))
return;
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1, bg);
if (!screen_write_collect_clear_end(ctx, s->cy, s->cx, bg)) {
ci->x = s->cx;
ci->type = CLEAR_END;
ci->bg = bg;
TAILQ_INSERT_TAIL(&ctx->list[s->cy].items, ci, entry);
ctx->item = xcalloc(1, sizeof *ctx->item);
}
}
/* Clear to start of line from cursor. */
void
screen_write_clearstartofline(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
u_int sx = screen_size_x(s);
struct screen_write_collect_item *ci = ctx->item;
if (s->cx >= sx - 1) {
screen_write_clearline(ctx, bg);
return;
}
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg);
if (!screen_write_collect_clear_start(ctx, s->cy, s->cx, bg)) {
ci->x = s->cx;
ci->type = CLEAR_START;
ci->bg = bg;
TAILQ_INSERT_TAIL(&ctx->list[s->cy].items, ci, entry);
ctx->item = xcalloc(1, sizeof *ctx->item);
}
}
/* Move cursor to px,py. */
void
screen_write_cursormove(struct screen_write_ctx *ctx, int px, int py,
int origin)
{
struct screen *s = ctx->s;
if (origin && py != -1 && (s->mode & MODE_ORIGIN)) {
if ((u_int)py > s->rlower - s->rupper)
py = s->rlower;
else
py += s->rupper;
}
if (px != -1 && (u_int)px > screen_size_x(s) - 1)
px = screen_size_x(s) - 1;
if (py != -1 && (u_int)py > screen_size_y(s) - 1)
py = screen_size_y(s) - 1;
screen_write_set_cursor(ctx, px, py);
}
/* Reverse index (up with scroll). */
void
screen_write_reverseindex(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
if (s->cy == s->rupper) {
grid_view_scroll_region_down(s->grid, s->rupper, s->rlower, bg);
screen_write_collect_flush(ctx, 0, __func__);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
tty_write(tty_cmd_reverseindex, &ttyctx);
} else if (s->cy > 0)
screen_write_set_cursor(ctx, -1, s->cy - 1);
}
/* Set scroll region. */
void
screen_write_scrollregion(struct screen_write_ctx *ctx, u_int rupper,
u_int rlower)
{
struct screen *s = ctx->s;
if (rupper > screen_size_y(s) - 1)
rupper = screen_size_y(s) - 1;
if (rlower > screen_size_y(s) - 1)
rlower = screen_size_y(s) - 1;
if (rupper >= rlower) /* cannot be one line */
return;
screen_write_collect_flush(ctx, 0, __func__);
/* Cursor moves to top-left. */
screen_write_set_cursor(ctx, 0, 0);
s->rupper = rupper;
s->rlower = rlower;
}
/* Line feed. */
void
screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_line *gl;
gl = grid_get_line(gd, gd->hsize + s->cy);
if (wrapped)
gl->flags |= GRID_LINE_WRAPPED;
else
gl->flags &= ~GRID_LINE_WRAPPED;
log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy,
s->rupper, s->rlower);
if (bg != ctx->bg) {
screen_write_collect_flush(ctx, 1, __func__);
ctx->bg = bg;
}
if (s->cy == s->rlower) {
grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg);
screen_write_collect_scroll(ctx);
ctx->scrolled++;
} else if (s->cy < screen_size_y(s) - 1)
screen_write_set_cursor(ctx, -1, s->cy + 1);
}
/* Scroll up. */
void
screen_write_scrollup(struct screen_write_ctx *ctx, u_int lines, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
u_int i;
if (lines == 0)
lines = 1;
else if (lines > s->rlower - s->rupper + 1)
lines = s->rlower - s->rupper + 1;
if (bg != ctx->bg) {
screen_write_collect_flush(ctx, 1, __func__);
ctx->bg = bg;
}
for (i = 0; i < lines; i++) {
grid_view_scroll_region_up(gd, s->rupper, s->rlower, bg);
screen_write_collect_scroll(ctx);
}
ctx->scrolled += lines;
}
/* Scroll down. */
void
screen_write_scrolldown(struct screen_write_ctx *ctx, u_int lines, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
u_int i;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
if (lines == 0)
lines = 1;
else if (lines > s->rlower - s->rupper + 1)
lines = s->rlower - s->rupper + 1;
for (i = 0; i < lines; i++)
grid_view_scroll_region_down(gd, s->rupper, s->rlower, bg);
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = lines;
tty_write(tty_cmd_scrolldown, &ttyctx);
}
/* Carriage return (cursor to start of line). */
void
screen_write_carriagereturn(struct screen_write_ctx *ctx)
{
screen_write_set_cursor(ctx, 0, -1);
}
/* Clear to end of screen from cursor. */
void
screen_write_clearendofscreen(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s), sy = screen_size_y(s);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
/* Scroll into history if it is enabled and clearing entire screen. */
if (s->cx == 0 && s->cy == 0 && (gd->flags & GRID_HISTORY))
grid_view_clear_history(gd, bg);
else {
if (s->cx <= sx - 1)
grid_view_clear(gd, s->cx, s->cy, sx - s->cx, 1, bg);
grid_view_clear(gd, 0, s->cy + 1, sx, sy - (s->cy + 1), bg);
}
screen_write_collect_clear(ctx, s->cy + 1, sy - (s->cy + 1));
screen_write_collect_flush(ctx, 0, __func__);
tty_write(tty_cmd_clearendofscreen, &ttyctx);
}
/* Clear to start of screen. */
void
screen_write_clearstartofscreen(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
if (s->cy > 0)
grid_view_clear(s->grid, 0, 0, sx, s->cy, bg);
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1, bg);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1, bg);
screen_write_collect_clear(ctx, 0, s->cy);
screen_write_collect_flush(ctx, 0, __func__);
tty_write(tty_cmd_clearstartofscreen, &ttyctx);
}
/* Clear entire screen. */
void
screen_write_clearscreen(struct screen_write_ctx *ctx, u_int bg)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s), sy = screen_size_y(s);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = bg;
/* Scroll into history if it is enabled. */
if (s->grid->flags & GRID_HISTORY)
grid_view_clear_history(s->grid, bg);
else
grid_view_clear(s->grid, 0, 0, sx, sy, bg);
screen_write_collect_clear(ctx, 0, sy);
tty_write(tty_cmd_clearscreen, &ttyctx);
}
/* Clear entire history. */
void
screen_write_clearhistory(struct screen_write_ctx *ctx)
{
grid_clear_history(ctx->s->grid);
}
/* Clear to start of a collected line. */
static int
screen_write_collect_clear_start(struct screen_write_ctx *ctx, u_int y, u_int x,
u_int bg)
{
struct screen_write_collect_item *ci, *tmp;
size_t size = 0;
u_int items = 0;
int redundant = 0;
if (TAILQ_EMPTY(&ctx->list[y].items))
return (0);
TAILQ_FOREACH_SAFE(ci, &ctx->list[y].items, entry, tmp) {
switch (ci->type) {
case CLEAR_START:
if (ci->x >= x) {
if (ci->bg == bg)
redundant = 1;
continue;
}
break;
case CLEAR_END:
if (ci->x <= x)
ci->x = x;
continue;
case TEXT:
if (ci->x > x)
continue;
break;
}
items++;
size += ci->used;
TAILQ_REMOVE(&ctx->list[y].items, ci, entry);
free(ci);
}
ctx->skipped += size;
log_debug("%s: dropped %u items (%zu bytes) (line %u)", __func__, items,
size, y);
return (redundant);
}
/* Clear to end of a collected line. */
static int
screen_write_collect_clear_end(struct screen_write_ctx *ctx, u_int y, u_int x,
u_int bg)
{
struct screen_write_collect_item *ci, *tmp;
size_t size = 0;
int redundant = 0;
u_int items = 0;
if (TAILQ_EMPTY(&ctx->list[y].items))
return (0);
TAILQ_FOREACH_SAFE(ci, &ctx->list[y].items, entry, tmp) {
switch (ci->type) {
case CLEAR_START:
if (ci->x >= x)
ci->x = x;
continue;
case CLEAR_END:
if (ci->x <= x) {
if (ci->bg == bg)
redundant = 1;
continue;
}
break;
case TEXT:
if (ci->x < x)
continue;
break;
}
items++;
size += ci->used;
TAILQ_REMOVE(&ctx->list[y].items, ci, entry);
free(ci);
}
ctx->skipped += size;
log_debug("%s: dropped %u items (%zu bytes) (line %u)", __func__, items,
size, y);
return (redundant);
}
/* Clear part of a collected line. */
static void
screen_write_collect_clear(struct screen_write_ctx *ctx, u_int y, u_int n)
{
struct screen_write_collect_item *ci, *tmp;
u_int i, items;
size_t size;
for (i = y; i < y + n; i++) {
if (TAILQ_EMPTY(&ctx->list[i].items))
continue;
items = 0;
size = 0;
TAILQ_FOREACH_SAFE(ci, &ctx->list[i].items, entry, tmp) {
items++;
size += ci->used;
TAILQ_REMOVE(&ctx->list[i].items, ci, entry);
free(ci);
}
ctx->skipped += size;
log_debug("%s: dropped %u items (%zu bytes) (line %u)",
__func__, items, size, y);
}
}
/* Scroll collected lines up. */
static void
screen_write_collect_scroll(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct screen_write_collect_line *cl;
u_int y;
log_debug("%s: at %u,%u (region %u-%u)", __func__, s->cx, s->cy,
s->rupper, s->rlower);
screen_write_collect_clear(ctx, s->rupper, 1);
for (y = s->rupper; y < s->rlower; y++) {
cl = &ctx->list[y + 1];
TAILQ_CONCAT(&ctx->list[y].items, &cl->items, entry);
}
}
/* Flush collected lines. */
static void
screen_write_collect_flush(struct screen_write_ctx *ctx, int scroll_only,
const char *from)
{
struct screen *s = ctx->s;
struct screen_write_collect_item *ci, *tmp;
u_int y, cx, cy, items = 0;
struct tty_ctx ttyctx;
size_t written = 0;
if (ctx->scrolled != 0) {
log_debug("%s: scrolled %u (region %u-%u)", __func__,
ctx->scrolled, s->rupper, s->rlower);
if (ctx->scrolled > s->rlower - s->rupper + 1)
ctx->scrolled = s->rlower - s->rupper + 1;
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.num = ctx->scrolled;
ttyctx.bg = ctx->bg;
tty_write(tty_cmd_scrollup, &ttyctx);
}
ctx->scrolled = 0;
ctx->bg = 8;
if (scroll_only)
return;
cx = s->cx; cy = s->cy;
for (y = 0; y < screen_size_y(s); y++) {
if (ctx->list[y].bg != 0) {
screen_write_set_cursor(ctx, 0, y);
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = ctx->list[y].bg - 1;
tty_write(tty_cmd_clearline, &ttyctx);
}
TAILQ_FOREACH_SAFE(ci, &ctx->list[y].items, entry, tmp) {
screen_write_set_cursor(ctx, ci->x, y);
if (ci->type == CLEAR_END) {
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = ci->bg;
tty_write(tty_cmd_clearendofline, &ttyctx);
} else if (ci->type == CLEAR_START) {
screen_write_initctx(ctx, &ttyctx, 1);
ttyctx.bg = ci->bg;
tty_write(tty_cmd_clearstartofline, &ttyctx);
} else {
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.cell = &ci->gc;
ttyctx.wrapped = ci->wrapped;
ttyctx.ptr = ci->data;
ttyctx.num = ci->used;
tty_write(tty_cmd_cells, &ttyctx);
}
items++;
written += ci->used;
TAILQ_REMOVE(&ctx->list[y].items, ci, entry);
free(ci);
}
}
s->cx = cx; s->cy = cy;
log_debug("%s: flushed %u items (%zu bytes) (%s)", __func__, items,
written, from);
ctx->written += written;
}
/* Finish and store collected cells. */
void
screen_write_collect_end(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct screen_write_collect_item *ci = ctx->item;
struct grid_cell gc;
u_int xx;
if (ci->used == 0)
return;
ci->data[ci->used] = '\0';
ci->x = s->cx;
TAILQ_INSERT_TAIL(&ctx->list[s->cy].items, ci, entry);
ctx->item = xcalloc(1, sizeof *ctx->item);
log_debug("%s: %u %s (at %u,%u)", __func__, ci->used, ci->data, s->cx,
s->cy);
if (s->cx != 0) {
for (xx = s->cx; xx > 0; xx--) {
grid_view_get_cell(s->grid, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(s->grid, xx, s->cy,
&grid_default_cell);
}
if (gc.data.width > 1) {
grid_view_set_cell(s->grid, xx, s->cy,
&grid_default_cell);
}
}
grid_view_set_cells(s->grid, s->cx, s->cy, &ci->gc, ci->data, ci->used);
screen_write_set_cursor(ctx, s->cx + ci->used, -1);
for (xx = s->cx; xx < screen_size_x(s); xx++) {
grid_view_get_cell(s->grid, xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
grid_view_set_cell(s->grid, xx, s->cy, &grid_default_cell);
}
}
/* Write cell data, collecting if necessary. */
void
screen_write_collect_add(struct screen_write_ctx *ctx,
const struct grid_cell *gc)
{
struct screen *s = ctx->s;
struct screen_write_collect_item *ci;
u_int sx = screen_size_x(s);
int collect;
/*
* Don't need to check that the attributes and whatnot are still the
* same - input_parse will end the collection when anything that isn't
* a plain character is encountered.
*/
collect = 1;
if (gc->data.width != 1 || gc->data.size != 1 || *gc->data.data >= 0x7f)
collect = 0;
else if (gc->attr & GRID_ATTR_CHARSET)
collect = 0;
else if (~s->mode & MODE_WRAP)
collect = 0;
else if (s->mode & MODE_INSERT)
collect = 0;
else if (s->sel != NULL)
collect = 0;
if (!collect) {
screen_write_collect_end(ctx);
screen_write_collect_flush(ctx, 0, __func__);
screen_write_cell(ctx, gc);
return;
}
ctx->cells++;
if (s->cx > sx - 1 || ctx->item->used > sx - 1 - s->cx)
screen_write_collect_end(ctx);
ci = ctx->item; /* may have changed */
if (s->cx > sx - 1) {
log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy);
ci->wrapped = 1;
screen_write_linefeed(ctx, 1, 8);
screen_write_set_cursor(ctx, 0, -1);
}
if (ci->used == 0)
memcpy(&ci->gc, gc, sizeof ci->gc);
ci->data[ci->used++] = gc->data.data[0];
if (ci->used == (sizeof ci->data) - 1)
screen_write_collect_end(ctx);
}
/* Write cell data. */
void
screen_write_cell(struct screen_write_ctx *ctx, const struct grid_cell *gc)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_line *gl;
struct grid_cell_entry *gce;
struct grid_cell tmp_gc, now_gc;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s), sy = screen_size_y(s);
u_int width = gc->data.width, xx, last, cx, cy;
int selected, skip = 1;
/* Ignore padding cells. */
if (gc->flags & GRID_FLAG_PADDING)
return;
ctx->cells++;
/* If the width is zero, combine onto the previous character. */
if (width == 0) {
screen_write_collect_flush(ctx, 0, __func__);
if ((gc = screen_write_combine(ctx, &gc->data, &xx)) != 0) {
cx = s->cx; cy = s->cy;
screen_write_set_cursor(ctx, xx, s->cy);
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
s->cx = cx; s->cy = cy;
}
return;
}
/* Flush any existing scrolling. */
screen_write_collect_flush(ctx, 1, __func__);
/* If this character doesn't fit, ignore it. */
if ((~s->mode & MODE_WRAP) &&
width > 1 &&
(width > sx || (s->cx != sx && s->cx > sx - width)))
return;
/* If in insert mode, make space for the cells. */
if (s->mode & MODE_INSERT) {
grid_view_insert_cells(s->grid, s->cx, s->cy, width, 8);
skip = 0;
}
/* Check this will fit on the current line and wrap if not. */
if ((s->mode & MODE_WRAP) && s->cx > sx - width) {
log_debug("%s: wrapped at %u,%u", __func__, s->cx, s->cy);
screen_write_linefeed(ctx, 1, 8);
screen_write_set_cursor(ctx, 0, -1);
screen_write_collect_flush(ctx, 1, __func__);
}
/* Sanity check cursor position. */
if (s->cx > sx - width || s->cy > sy - 1)
return;
screen_write_initctx(ctx, &ttyctx, 0);
/* Handle overwriting of UTF-8 characters. */
gl = grid_get_line(s->grid, s->grid->hsize + s->cy);
if (gl->flags & GRID_LINE_EXTENDED) {
grid_view_get_cell(gd, s->cx, s->cy, &now_gc);
if (screen_write_overwrite(ctx, &now_gc, width))
skip = 0;
}
/*
* If the new character is UTF-8 wide, fill in padding cells. Have
* already ensured there is enough room.
*/
for (xx = s->cx + 1; xx < s->cx + width; xx++) {
log_debug("%s: new padding at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
skip = 0;
}
/* If no change, do not draw. */
if (skip) {
if (s->cx >= gl->cellsize)
skip = grid_cells_equal(gc, &grid_default_cell);
else {
gce = &gl->celldata[s->cx];
if (gce->flags & GRID_FLAG_EXTENDED)
skip = 0;
else if (gc->flags != gce->flags)
skip = 0;
else if (gc->attr != gce->data.attr)
skip = 0;
else if (gc->fg != gce->data.fg)
skip = 0;
else if (gc->bg != gce->data.bg)
skip = 0;
else if (gc->data.width != 1)
skip = 0;
else if (gc->data.size != 1)
skip = 0;
else if (gce->data.data != gc->data.data[0])
skip = 0;
}
}
/* Update the selected flag and set the cell. */
selected = screen_check_selection(s, s->cx, s->cy);
if (selected && (~gc->flags & GRID_FLAG_SELECTED)) {
memcpy(&tmp_gc, gc, sizeof tmp_gc);
tmp_gc.flags |= GRID_FLAG_SELECTED;
grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
} else if (!selected && (gc->flags & GRID_FLAG_SELECTED)) {
memcpy(&tmp_gc, gc, sizeof tmp_gc);
tmp_gc.flags &= ~GRID_FLAG_SELECTED;
grid_view_set_cell(gd, s->cx, s->cy, &tmp_gc);
} else if (!skip)
grid_view_set_cell(gd, s->cx, s->cy, gc);
if (selected)
skip = 0;
/*
* Move the cursor. If not wrapping, stick at the last character and
* replace it.
*/
last = !(s->mode & MODE_WRAP);
if (s->cx <= sx - last - width)
screen_write_set_cursor(ctx, s->cx + width, -1);
else
screen_write_set_cursor(ctx, sx - last, -1);
/* Create space for character in insert mode. */
if (s->mode & MODE_INSERT) {
screen_write_collect_flush(ctx, 0, __func__);
ttyctx.num = width;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
/* Write to the screen. */
if (!skip) {
if (selected) {
screen_select_cell(s, &tmp_gc, gc);
ttyctx.cell = &tmp_gc;
} else
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
ctx->written++;
} else
ctx->skipped++;
}
/* Combine a UTF-8 zero-width character onto the previous. */
static const struct grid_cell *
screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud,
u_int *xx)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
static struct grid_cell gc;
u_int n;
/* Can't combine if at 0. */
if (s->cx == 0)
return (NULL);
/* Empty data is out. */
if (ud->size == 0)
fatalx("UTF-8 data empty");
/* Retrieve the previous cell. */
for (n = 1; n <= s->cx; n++) {
grid_view_get_cell(gd, s->cx - n, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
}
if (n > s->cx)
return (NULL);
*xx = s->cx - n;
/* Check there is enough space. */
if (gc.data.size + ud->size > sizeof gc.data.data)
return (NULL);
log_debug("%s: %.*s onto %.*s at %u,%u", __func__, (int)ud->size,
ud->data, (int)gc.data.size, gc.data.data, *xx, s->cy);
/* Append the data. */
memcpy(gc.data.data + gc.data.size, ud->data, ud->size);
gc.data.size += ud->size;
/* Set the new cell. */
grid_view_set_cell(gd, *xx, s->cy, &gc);
return (&gc);
}
/*
* UTF-8 wide characters are a bit of an annoyance. They take up more than one
* cell on the screen, so following cells must not be drawn by marking them as
* padding.
*
* So far, so good. The problem is, when overwriting a padding cell, or a UTF-8
* character, it is necessary to also overwrite any other cells which covered
* by the same character.
*/
static int
screen_write_overwrite(struct screen_write_ctx *ctx, struct grid_cell *gc,
u_int width)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_cell tmp_gc;
u_int xx;
int done = 0;
if (gc->flags & GRID_FLAG_PADDING) {
/*
* A padding cell, so clear any following and leading padding
* cells back to the character. Don't overwrite the current
* cell as that happens later anyway.
*/
xx = s->cx + 1;
while (--xx > 0) {
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
log_debug("%s: padding at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/* Overwrite the character at the start of this padding. */
log_debug("%s: character at %u,%u", __func__, xx, s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
/*
* Overwrite any padding cells that belong to any UTF-8 characters
* we'll be overwriting with the current character.
*/
if (width != 1 ||
gc->data.width != 1 ||
gc->flags & GRID_FLAG_PADDING) {
xx = s->cx + width - 1;
while (++xx < screen_size_x(s)) {
grid_view_get_cell(gd, xx, s->cy, &tmp_gc);
if (~tmp_gc.flags & GRID_FLAG_PADDING)
break;
log_debug("%s: overwrite at %u,%u", __func__, xx,
s->cy);
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
}
return (done);
}
/* Set external clipboard. */
void
screen_write_setselection(struct screen_write_ctx *ctx, u_char *str, u_int len)
{
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.ptr = str;
ttyctx.num = len;
tty_write(tty_cmd_setselection, &ttyctx);
}
/* Write unmodified string. */
void
screen_write_rawstring(struct screen_write_ctx *ctx, u_char *str, u_int len)
{
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx, 0);
ttyctx.ptr = str;
ttyctx.num = len;
tty_write(tty_cmd_rawstring, &ttyctx);
}