tmux/screen-write.c

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/* $Id: screen-write.c,v 1.41 2009-03-29 11:06:22 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 <string.h>
#include "tmux.h"
void screen_write_save(struct screen_write_ctx *);
void screen_write_overwrite(struct screen_write_ctx *);
/* Initialise writing with a window. */
void
screen_write_start(
struct screen_write_ctx *ctx, struct window_pane *wp, struct screen *s)
{
ctx->wp = wp;
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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)
{
}
/* Write character. */
void
screen_write_putc(
struct screen_write_ctx *ctx, struct grid_cell *gc, u_char ch)
{
gc->data = ch;
screen_write_cell(ctx, gc, NULL);
}
/* Write string. */
void printflike3
screen_write_puts(
struct screen_write_ctx *ctx, struct grid_cell *gc, const char *fmt, ...)
{
va_list ap;
char *msg, *ptr;
va_start(ap, fmt);
xvasprintf(&msg, fmt, ap);
va_end(ap);
for (ptr = msg; *ptr != '\0'; ptr++)
screen_write_putc(ctx, gc, (u_char) *ptr);
xfree(msg);
}
/* Copy from another screen. */
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void
screen_write_copy(struct screen_write_ctx *ctx,
struct screen *src, u_int px, u_int py, u_int nx, u_int ny)
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{
struct screen *s = ctx->s;
struct grid *gd = src->grid;
const struct grid_cell *gc;
struct grid_utf8 *gu;
u_char *udata;
u_int xx, yy, cx, cy;
cx = s->cx;
cy = s->cy;
for (yy = py; yy < py + ny; yy++) {
for (xx = px; xx < px + nx; xx++) {
if (xx >= gd->sx || yy >= gd->hsize + gd->sy)
gc = &grid_default_cell;
else
gc = grid_peek_cell(gd, xx, yy);
udata = NULL;
if (gc->flags & GRID_FLAG_UTF8) {
gu = grid_get_utf8(gd, xx, yy);
udata = gu->data;
}
screen_write_cell(ctx, gc, udata);
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}
cy++;
screen_write_cursormove(ctx, cx, cy);
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}
}
/* Save cursor and region positions. */
void
screen_write_save(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
s->old_cx = s->cx;
s->old_cy = s->cy;
s->old_rlower = s->rlower;
s->old_rupper = s->rupper;
}
/* 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 (ny > s->cy)
ny = s->cy;
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 (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
return;
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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;
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if (nx == 0)
nx = 1;
if (nx > s->cx)
nx = s->cx;
if (nx == 0)
return;
s->cx -= nx;
}
/* Insert nx characters. */
void
screen_write_insertcharacter(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
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if (nx == 0)
nx = 1;
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if (nx > screen_size_x(s) - 1 - s->cx)
nx = screen_size_x(s) - 1 - s->cx;
if (nx == 0)
return;
screen_write_save(ctx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_insert_cells(s->grid, s->cx, s->cy, nx);
tty_write_cmd(ctx->wp, TTY_INSERTCHARACTER, nx);
}
/* Delete nx characters. */
void
screen_write_deletecharacter(struct screen_write_ctx *ctx, u_int nx)
{
struct screen *s = ctx->s;
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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;
screen_write_save(ctx);
if (s->cx <= screen_size_x(s) - 1)
grid_view_delete_cells(s->grid, s->cx, s->cy, nx);
tty_write_cmd(ctx->wp, TTY_DELETECHARACTER, nx);
}
/* Insert ny lines. */
void
screen_write_insertline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
return;
screen_write_save(ctx);
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->rupper, s->rlower, s->cy, ny);
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}
tty_write_cmd(ctx->wp, TTY_INSERTLINE, ny);
}
/* Delete ny lines. */
void
screen_write_deleteline(struct screen_write_ctx *ctx, u_int ny)
{
struct screen *s = ctx->s;
if (ny == 0)
ny = 1;
if (ny > screen_size_y(s) - 1 - s->cy)
ny = screen_size_y(s) - 1 - s->cy;
if (ny == 0)
return;
screen_write_save(ctx);
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->rupper, s->rlower, s->cy, ny);
}
tty_write_cmd(ctx->wp, TTY_DELETELINE, ny);
}
/* Clear line at cursor. */
void
screen_write_clearline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
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screen_write_save(ctx);
grid_view_clear(s->grid, 0, s->cy, screen_size_x(s), 1);
tty_write_cmd(ctx->wp, TTY_CLEARLINE);
}
/* Clear to end of line from cursor. */
void
screen_write_clearendofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx;
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screen_write_save(ctx);
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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_cmd(ctx->wp, TTY_CLEARENDOFLINE);
}
/* Clear to start of line from cursor. */
void
screen_write_clearstartofline(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx;
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screen_write_save(ctx);
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_cmd(ctx->wp, TTY_CLEARSTARTOFLINE);
}
/* 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;
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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;
}
/* Set cursor mode. */
void
screen_write_cursormode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
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if (state)
s->mode |= MODE_CURSOR;
else
s->mode &= ~MODE_CURSOR;
}
/* Reverse index (up with scroll). */
void
screen_write_reverseindex(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
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screen_write_save(ctx);
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_cmd(ctx->wp, TTY_REVERSEINDEX);
}
/* Set scroll region. */
void
screen_write_scrollregion(
struct screen_write_ctx *ctx, u_int rupper, u_int rlower)
{
struct screen *s = ctx->s;
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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)
return;
/* Cursor moves to top-left. */
s->cx = 0;
s->cy = 0;
s->rupper = rupper;
s->rlower = rlower;
}
/* Set insert mode. */
void
screen_write_insertmode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
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if (state)
s->mode |= MODE_INSERT;
else
s->mode &= ~MODE_INSERT;
}
/* Set mouse mode. */
void
screen_write_mousemode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_MOUSE;
else
s->mode &= ~MODE_MOUSE;
}
/* Line feed (down with scroll). */
void
screen_write_linefeed(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
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screen_write_save(ctx);
if (s->cy == s->rlower)
grid_view_scroll_region_up(s->grid, s->rupper, s->rlower);
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else if (s->cy < screen_size_y(s) - 1)
s->cy++;
tty_write_cmd(ctx->wp, TTY_LINEFEED);
}
/* Carriage return (cursor to start of line). */
void
screen_write_carriagereturn(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
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s->cx = 0;
}
/* Set keypad cursor keys mode. */
void
screen_write_kcursormode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
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if (state)
s->mode |= MODE_KCURSOR;
else
s->mode &= ~MODE_KCURSOR;
}
/* Set keypad number keys mode. */
void
screen_write_kkeypadmode(struct screen_write_ctx *ctx, int state)
{
struct screen *s = ctx->s;
if (state)
s->mode |= MODE_KKEYPAD;
else
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s->mode &= ~MODE_KKEYPAD;
}
/* Clear to end of screen from cursor. */
void
screen_write_clearendofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx, sy;
screen_write_save(ctx);
sx = screen_size_x(s);
sy = screen_size_y(s);
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_cmd(ctx->wp, TTY_CLEARENDOFSCREEN);
}
/* Clear to start of screen. */
void
screen_write_clearstartofscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
u_int sx;
screen_write_save(ctx);
sx = screen_size_x(s);
if (s->cy > 0)
grid_view_clear(s->grid, 0, 0, sx, s->cy - 1);
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);
tty_write_cmd(ctx->wp, TTY_CLEARSTARTOFSCREEN);
}
/* Clear entire screen. */
void
screen_write_clearscreen(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
screen_write_save(ctx);
grid_view_clear(s->grid, 0, 0, screen_size_x(s), screen_size_y(s));
tty_write_cmd(ctx->wp, TTY_CLEARSCREEN);
}
/* Write cell data. */
void
screen_write_cell(
struct screen_write_ctx *ctx, const struct grid_cell *gc, u_char *udata)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
struct grid_utf8 gu, *tmp_gu;
u_int width, uvalue, xx, i;
struct grid_cell tmp_gc, *tmp_gc2;
size_t size;
/* Ignore padding. */
if (gc->flags & GRID_FLAG_PADDING)
return;
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/* Find character width. */
if (gc->flags & GRID_FLAG_UTF8) {
uvalue = utf8_combine(udata);
width = utf8_width(uvalue);
gu.width = width;
memcpy(&gu.data, udata, sizeof gu.data);
} else
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width = 1;
/* If the width is zero, combine onto the previous character. */
if (width == 0) {
if (s->cx == 0)
return;
tmp_gc2 = grid_view_get_cell(gd, s->cx - 1, s->cy);
if (!(tmp_gc2->flags & GRID_FLAG_UTF8)) {
tmp_gc2->flags |= GRID_FLAG_UTF8;
memset(&gu.data, 0xff, sizeof gu.data);
*gu.data = tmp_gc2->data;
gu.width = 1;
grid_view_set_utf8(gd, s->cx - 1, s->cy, &gu);
}
tmp_gu = grid_view_get_utf8(gd, s->cx - 1, s->cy);
for (i = 0; i < 8; i++) {
if (tmp_gu->data[i] == 0xff)
break;
}
memcpy(tmp_gu->data + i, udata, 8 - i);
/* Assume the previous character has just been input. */
for (size = 0; size < 8; size++) {
if (udata[size] == 0xff)
break;
}
tty_write_cmd(ctx->wp, TTY_RAW, udata, size);
return;
}
/* If the character is wider than the screen, don't print it. */
if (width > screen_size_x(s)) {
memcpy(&tmp_gc, gc, sizeof tmp_gc);
tmp_gc.data = '_';
width = 1;
gc = &tmp_gc;
}
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/* Check this will fit on the current line; scroll if not. */
if (s->cx > screen_size_x(s) - width) {
screen_write_carriagereturn(ctx);
screen_write_linefeed(ctx);
}
/* Sanity checks. */
if (s->cx > screen_size_x(s) - 1 || s->cy > screen_size_y(s) - 1)
return;
/* Handle overwriting of UTF-8 characters. */
screen_write_overwrite(ctx);
/*
* 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++) {
tmp_gc2 = grid_view_get_cell(gd, xx, s->cy);
if (tmp_gc2 != NULL)
tmp_gc2->flags |= GRID_FLAG_PADDING;
}
/* Set the cell. */
grid_view_set_cell(gd, s->cx, s->cy, gc);
if (gc->flags & GRID_FLAG_UTF8)
grid_view_set_utf8(gd, s->cx, s->cy, &gu);
/* Move the cursor. */
screen_write_save(ctx);
s->cx += width;
/* Draw to the screen if necessary. */
if (screen_check_selection(s, s->cx - width, s->cy))
tty_write_cmd(ctx->wp, TTY_CELL, &s->sel.cell, &gu);
else
tty_write_cmd(ctx->wp, TTY_CELL, gc, &gu);
}
/*
* 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.
*/
void
screen_write_overwrite(struct screen_write_ctx *ctx)
{
struct screen *s = ctx->s;
struct grid *gd = s->grid;
const struct grid_cell *gc;
const struct grid_utf8 *gu;
u_int xx;
gc = grid_view_peek_cell(gd, s->cx, s->cy);
gu = grid_view_peek_utf8(gd, s->cx, s->cy);
if (gc->flags & GRID_FLAG_PADDING) {
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/*
* 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) {
gc = grid_view_peek_cell(gd, xx, s->cy);
if (!(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);
/* Overwrite following padding cells. */
xx = s->cx;
while (++xx < screen_size_x(s)) {
gc = grid_view_peek_cell(gd, xx, s->cy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
} else if (gc->flags & GRID_FLAG_UTF8 && gu->width > 1) {
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/*
* An UTF-8 wide cell; overwrite following padding cells only.
*/
xx = s->cx;
while (++xx < screen_size_x(s)) {
gc = grid_view_peek_cell(gd, xx, s->cy);
if (!(gc->flags & GRID_FLAG_PADDING))
break;
grid_view_set_cell(gd, xx, s->cy, &grid_default_cell);
}
}
}