tmux/screen-write.c

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25 KiB
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/* $OpenBSD$ */
/*
* 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_initctx(struct screen_write_ctx *,
struct tty_ctx *);
static void screen_write_save_last(struct screen_write_ctx *,
struct tty_ctx *);
static int screen_write_overwrite(struct screen_write_ctx *,
struct grid_cell *, u_int);
static int screen_write_combine(struct screen_write_ctx *,
const struct utf8_data *);
static const struct grid_cell screen_write_pad_cell = {
GRID_FLAG_PADDING, 0, { .fg = 8 }, { .bg = 8 }, { { 0 }, 0, 0, 0 }
};
/* Initialise writing with a window. */
void
screen_write_start(struct screen_write_ctx *ctx, struct window_pane *wp,
struct screen *s)
{
ctx->wp = wp;
if (wp != NULL && s == NULL)
ctx->s = wp->screen;
else
ctx->s = s;
}
/* Finish writing. */
void
screen_write_stop(__unused struct screen_write_ctx *ctx)
{
}
/* 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_INSERT|MODE_KCURSOR|MODE_KKEYPAD|MODE_FOCUSON);
s->mode &= ~(ALL_MOUSE_MODES|MODE_MOUSE_UTF8|MODE_MOUSE_SGR);
screen_write_clearscreen(ctx);
screen_write_cursormove(ctx, 0, 0);
}
/* Write character. */
void
screen_write_putc(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
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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, with embedded formatting. */
size_t
screen_write_cstrlen(const char *fmt, ...)
{
va_list ap;
char *msg, *msg2, *ptr, *ptr2;
size_t size;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
msg2 = xmalloc(strlen(msg) + 1);
ptr = msg;
ptr2 = msg2;
while (*ptr != '\0') {
if (ptr[0] == '#' && ptr[1] == '[') {
while (*ptr != ']' && *ptr != '\0')
ptr++;
if (*ptr == ']')
ptr++;
continue;
}
*ptr2++ = *ptr++;
}
*ptr2 = '\0';
size = screen_write_strlen("%s", msg2);
free(msg);
free(msg2);
return (size);
}
/* 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)
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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;
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}
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);
}
/* Write string, similar to nputs, but with embedded formatting (#[]). */
void
screen_write_cnputs(struct screen_write_ctx *ctx, ssize_t maxlen,
const struct grid_cell *gcp, const char *fmt, ...)
{
struct grid_cell gc;
struct utf8_data *ud = &gc.data;
va_list ap;
char *msg;
u_char *ptr, *last;
size_t left, size = 0;
enum utf8_state more;
memcpy(&gc, gcp, sizeof gc);
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
ptr = msg;
while (*ptr != '\0') {
if (ptr[0] == '#' && ptr[1] == '[') {
ptr += 2;
last = ptr + strcspn(ptr, "]");
if (*last == '\0') {
/* No ]. Not much point in doing anything. */
break;
}
*last = '\0';
style_parse(gcp, &gc, ptr);
ptr = last + 1;
continue;
}
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;
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}
size += ud->width;
screen_write_cell(ctx, &gc);
} else {
if (maxlen > 0 && size + 1 > (size_t)maxlen)
break;
if (*ptr > 0x1f && *ptr < 0x7f) {
size++;
screen_write_putc(ctx, &gc, *ptr);
}
ptr++;
}
}
free(msg);
}
/* Copy from another screen. */
void
screen_write_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_line *gl;
struct grid_cell gc;
u_int xx, yy, cx, cy, ax, bx;
cx = s->cx;
cy = s->cy;
for (yy = py; yy < py + ny; yy++) {
gl = &gd->linedata[yy];
if (yy < gd->hsize + gd->sy) {
/*
* Find start and end position and copy between
* them. Limit to the real end of the line then use a
* clear EOL only if copying to the end, otherwise
* could overwrite whatever is there already.
*/
if (px > gl->cellsize)
ax = gl->cellsize;
else
ax = px;
if (px + nx == gd->sx && px + nx > gl->cellsize)
bx = gl->cellsize;
else
bx = px + nx;
for (xx = ax; xx < bx; xx++) {
grid_get_cell(gd, xx, yy, &gc);
screen_write_cell(ctx, &gc);
}
if (px + nx == gd->sx && px + nx > gl->cellsize)
screen_write_clearendofline(ctx);
} else
screen_write_clearline(ctx);
cy++;
screen_write_cursormove(ctx, cx, cy);
}
}
/* Set up context for TTY command. */
static void
screen_write_initctx(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx)
{
struct screen *s = ctx->s;
ttyctx->wp = ctx->wp;
ttyctx->ocx = s->cx;
ttyctx->ocy = s->cy;
ttyctx->orlower = s->rlower;
ttyctx->orupper = s->rupper;
}
/* Save last cell on screen. */
static void
screen_write_save_last(struct screen_write_ctx *ctx, struct tty_ctx *ttyctx)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_cell gc;
u_int xx;
memcpy(&gc, &grid_default_cell, sizeof gc);
for (xx = 1; xx <= screen_size_x(s); xx++) {
grid_view_get_cell(gd, screen_size_x(s) - xx, s->cy, &gc);
if (~gc.flags & GRID_FLAG_PADDING)
break;
}
ttyctx->last_width = xx;
memcpy(&ttyctx->last_cell, &gc, sizeof ttyctx->last_cell);
}
/* 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;
if (ny == 0)
ny = 1;
if (s->cy < s->rupper) {
/* Above region. */
if (ny > s->cy)
ny = s->cy;
} else {
/* Below region. */
if (ny > s->cy - s->rupper)
ny = s->cy - s->rupper;
}
if (s->cx == screen_size_x(s))
s->cx--;
if (ny == 0)
return;
s->cy -= ny;
}
/* Cursor down by ny. */
void
screen_write_cursordown(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (s->cy > s->rlower) {
/* Below region. */
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
} else {
/* Above region. */
if (ny > s->rlower - s->cy)
ny = s->rlower - s->cy;
}
if (s->cx == screen_size_x(s))
s->cx--;
if (ny == 0)
return;
s->cy += ny;
}
/* Cursor right by nx. */
void
screen_write_cursorright(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
if (nx == 0)
nx = 1;
if (nx > screen_size_x(s) - 1 - s->cx)
nx = screen_size_x(s) - 1 - s->cx;
if (nx == 0)
return;
s->cx += nx;
}
/* Cursor left by nx. */
void
screen_write_cursorleft(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
if (nx == 0)
nx = 1;
if (nx > s->cx)
nx = s->cx;
if (nx == 0)
return;
s->cx -= nx;
}
/* 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;
if (s->cx == 0) {
if (s->cy == 0)
return;
gl = &s->grid->linedata[s->grid->hsize + s->cy - 1];
if (gl->flags & GRID_LINE_WRAPPED) {
s->cy--;
s->cx = screen_size_x(s) - 1;
}
} else
s->cx--;
}
/* 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;
screen_write_initctx(ctx, &ttyctx);
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);
}
s->cx = 0;
s->cy = 0;
s->rupper = 0;
s->rlower = 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)
{
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;
screen_write_initctx(ctx, &ttyctx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
ttyctx.num = nx;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
/* Delete nx characters. */
void
screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx)
{
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;
screen_write_initctx(ctx, &ttyctx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
ttyctx.num = nx;
tty_write(tty_cmd_deletecharacter, &ttyctx);
}
/* Clear nx characters. */
void
screen_write_clearcharacter(struct screen_write_ctx *ctx, u_int nx)
{
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;
screen_write_initctx(ctx, &ttyctx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_clear(s->grid, s->cx, s->cy, nx, 1);
ttyctx.num = nx;
tty_write(tty_cmd_clearcharacter, &ttyctx);
}
/* Insert ny lines. */
void
screen_write_insertline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
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);
grid_view_insert_lines(s->grid, s->cy, ny);
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);
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_insert_lines(s->grid, s->cy, ny);
else
grid_view_insert_lines_region(s->grid, s->rlower, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_insertline, &ttyctx);
}
/* Delete ny lines. */
void
screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
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);
grid_view_delete_lines(s->grid, s->cy, ny);
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);
if (s->cy < s->rupper || s->cy > s->rlower)
grid_view_delete_lines(s->grid, s->cy, ny);
else
grid_view_delete_lines_region(s->grid, s->rlower, s->cy, ny);
ttyctx.num = ny;
tty_write(tty_cmd_deleteline, &ttyctx);
}
/* Clear line at cursor. */
void
screen_write_clearline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx);
grid_view_clear(s->grid, 0, s->cy, screen_size_x(s), 1);
tty_write(tty_cmd_clearline, &ttyctx);
}
/* Clear to end of line from cursor. */
void
screen_write_clearendofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx);
sx = screen_size_x(s);
if (s->cx <= sx - 1)
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
tty_write(tty_cmd_clearendofline, &ttyctx);
}
/* Clear to start of line from cursor. */
void
screen_write_clearstartofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx);
sx = screen_size_x(s);
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
tty_write(tty_cmd_clearstartofline, &ttyctx);
}
/* Move cursor to px,py. */
void
screen_write_cursormove(struct screen_write_ctx *ctx, u_int px, u_int py)
{
struct screen *s = ctx->s;
if (px > screen_size_x(s) - 1)
px = screen_size_x(s) - 1;
if (py > screen_size_y(s) - 1)
py = screen_size_y(s) - 1;
s->cx = px;
s->cy = py;
}
/* Reverse index (up with scroll). */
void
screen_write_reverseindex(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx);
if (s->cy == s->rupper)
grid_view_scroll_region_down(s->grid, s->rupper, s->rlower);
else if (s->cy > 0)
s->cy--;
tty_write(tty_cmd_reverseindex, &ttyctx);
}
/* 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;
/* Cursor moves to top-left. */
s->cx = 0;
s->cy = 0;
s->rupper = rupper;
s->rlower = rlower;
}
/* Line feed. */
void
screen_write_linefeed(struct screen_write_ctx *ctx, int wrapped)
{
struct screen *s = ctx->s;
struct grid_line *gl;
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx);
gl = &s->grid->linedata[s->grid->hsize + s->cy];
if (wrapped)
gl->flags |= GRID_LINE_WRAPPED;
else
gl->flags &= ~GRID_LINE_WRAPPED;
if (s->cy == s->rlower)
grid_view_scroll_region_up(s->grid, s->rupper, s->rlower);
else if (s->cy < screen_size_y(s) - 1)
s->cy++;
ttyctx.num = wrapped;
tty_write(tty_cmd_linefeed, &ttyctx);
}
/* Carriage return (cursor to start of line). */
void
screen_write_carriagereturn(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
s->cx = 0;
}
/* Clear to end of screen from cursor. */
void
screen_write_clearendofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx, sy;
screen_write_initctx(ctx, &ttyctx);
sx = screen_size_x(s);
sy = screen_size_y(s);
/* Scroll into history if it is enabled and clearing entire screen. */
if (s->cy == 0 && s->grid->flags & GRID_HISTORY)
grid_view_clear_history(s->grid);
else {
if (s->cx <= sx - 1)
grid_view_clear(s->grid, s->cx, s->cy, sx - s->cx, 1);
grid_view_clear(s->grid, 0, s->cy + 1, sx, sy - (s->cy + 1));
}
tty_write(tty_cmd_clearendofscreen, &ttyctx);
}
/* Clear to start of screen. */
void
screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx;
screen_write_initctx(ctx, &ttyctx);
sx = screen_size_x(s);
if (s->cy > 0)
grid_view_clear(s->grid, 0, 0, sx, s->cy);
if (s->cx > sx - 1)
grid_view_clear(s->grid, 0, s->cy, sx, 1);
else
grid_view_clear(s->grid, 0, s->cy, s->cx + 1, 1);
tty_write(tty_cmd_clearstartofscreen, &ttyctx);
}
/* Clear entire screen. */
void
screen_write_clearscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct tty_ctx ttyctx;
u_int sx = screen_size_x(s);
u_int sy = screen_size_y(s);
screen_write_initctx(ctx, &ttyctx);
/* Scroll into history if it is enabled. */
if (s->grid->flags & GRID_HISTORY)
grid_view_clear_history(s->grid);
else
grid_view_clear(s->grid, 0, 0, sx, sy);
tty_write(tty_cmd_clearscreen, &ttyctx);
}
/* Clear entire history. */
void
screen_write_clearhistory(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
grid_move_lines(gd, 0, gd->hsize, gd->sy);
gd->hsize = 0;
}
/* 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 tty_ctx ttyctx;
u_int width, xx, last;
struct grid_cell tmp_gc, now_gc;
int insert, skip, selected;
/* Ignore padding. */
if (gc->flags & GRID_FLAG_PADDING)
return;
width = gc->data.width;
/*
* If this is a wide character and there is no room on the screen, for
* the entire character, don't print it.
*/
if (!(s->mode & MODE_WRAP)
&& (width > 1 && (width > screen_size_x(s) ||
(s->cx != screen_size_x(s)
&& s->cx > screen_size_x(s) - width))))
return;
/*
* If the width is zero, combine onto the previous character, if
* there is space.
*/
if (width == 0) {
if (screen_write_combine(ctx, &gc->data) == 0) {
screen_write_initctx(ctx, &ttyctx);
tty_write(tty_cmd_utf8character, &ttyctx);
}
return;
}
/* Initialise the redraw context. */
screen_write_initctx(ctx, &ttyctx);
/* If in insert mode, make space for the cells. */
if ((s->mode & MODE_INSERT) && s->cx <= screen_size_x(s) - width) {
xx = screen_size_x(s) - s->cx - width;
grid_move_cells(s->grid, s->cx + width, s->cx, s->cy, xx);
insert = 1;
} else
insert = 0;
skip = !insert;
/* Check this will fit on the current line and wrap if not. */
if ((s->mode & MODE_WRAP) && s->cx > screen_size_x(s) - width) {
screen_write_linefeed(ctx, 1);
s->cx = 0; /* carriage return */
skip = 0;
}
/* Sanity check cursor position. */
if (s->cx > screen_size_x(s) - width || s->cy > screen_size_y(s) - 1)
return;
/* Handle overwriting of UTF-8 characters. */
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++) {
grid_view_set_cell(gd, xx, s->cy, &screen_write_pad_cell);
skip = 0;
}
/* If no change, do not draw. */
if (skip)
skip = (memcmp(&now_gc, gc, sizeof now_gc) == 0);
/* Update the selection the flag and set the cell. */
selected = screen_check_selection(s, s->cx, s->cy);
if (selected && ~gc->flags & GRID_FLAG_SELECTED) {
skip = 0;
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) {
skip = 0;
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);
/*
* Move the cursor. If not wrapping, stick at the last character and
* replace it.
*/
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last = !(s->mode & MODE_WRAP);
if (s->cx <= screen_size_x(s) - last - width)
s->cx += width;
else
s->cx = screen_size_x(s) - last;
/* Create space for character in insert mode. */
if (insert) {
ttyctx.num = width;
tty_write(tty_cmd_insertcharacter, &ttyctx);
}
/* Save last cell if it will be needed. */
if (!skip && ctx->wp != NULL && ttyctx.ocx > ctx->wp->sx - width)
screen_write_save_last(ctx, &ttyctx);
/* Write to the screen. */
if (selected) {
memcpy(&tmp_gc, &s->sel.cell, sizeof tmp_gc);
utf8_copy(&tmp_gc.data, &gc->data);
tmp_gc.attr = tmp_gc.attr & ~GRID_ATTR_CHARSET;
tmp_gc.attr |= gc->attr & GRID_ATTR_CHARSET;
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tmp_gc.flags = gc->flags;
tmp_gc.flags &= ~(GRID_FLAG_FGRGB|GRID_FLAG_BGRGB);
tmp_gc.flags &= ~(GRID_FLAG_FG256|GRID_FLAG_BG256);
tmp_gc.flags |= s->sel.cell.flags &
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(GRID_FLAG_FG256|GRID_FLAG_BG256);
ttyctx.cell = &tmp_gc;
tty_write(tty_cmd_cell, &ttyctx);
} else if (!skip) {
ttyctx.cell = gc;
tty_write(tty_cmd_cell, &ttyctx);
}
}
/* Combine a UTF-8 zero-width character onto the previous. */
static int
screen_write_combine(struct screen_write_ctx *ctx, const struct utf8_data *ud)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_cell gc;
/* Can't combine if at 0. */
if (s->cx == 0)
return (-1);
/* Empty data is out. */
if (ud->size == 0)
fatalx("UTF-8 data empty");
/* Retrieve the previous cell. */
grid_view_get_cell(gd, s->cx - 1, s->cy, &gc);
/* Check there is enough space. */
if (gc.data.size + ud->size > sizeof gc.data.data)
return (-1);
/* 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, s->cx - 1, s->cy, &gc);
return (0);
}
/*
* 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;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
/* Overwrite the character at the start of this padding. */
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
/*
* Overwrite any padding cells that belong to a UTF-8 character
* we'll be overwriting with the current character.
*/
if (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;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
done = 1;
}
}
return (done);
}
void
screen_write_setselection(struct screen_write_ctx *ctx, u_char *str, u_int len)
{
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx);
ttyctx.ptr = str;
ttyctx.num = len;
tty_write(tty_cmd_setselection, &ttyctx);
}
void
screen_write_rawstring(struct screen_write_ctx *ctx, u_char *str, u_int len)
{
struct tty_ctx ttyctx;
screen_write_initctx(ctx, &ttyctx);
ttyctx.ptr = str;
ttyctx.num = len;
tty_write(tty_cmd_rawstring, &ttyctx);
}