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tmux/screen.c
Nicholas Marriott a3bfe208b3 Some code tidying, use macros in a few more places.
2007-07-10 10:21:58 +00:00

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/* $Id: screen.c,v 1.2 2007-07-10 10:21:58 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"
/*
* Virtual screen and basic ANSI terminal emulator.
*/
size_t screen_store_attributes(struct buffer *, u_char);
size_t screen_store_colours(struct buffer *, u_char);
void screen_free_lines(struct screen *, u_int, u_int);
void screen_make_lines(struct screen *, u_int, u_int);
void screen_move_lines(struct screen *, u_int, u_int, u_int);
void screen_fill_lines(
struct screen *, u_int, u_int, u_char, u_char, u_char);
uint16_t screen_extract(u_char *);
void screen_write_character(struct screen *, u_char);
void screen_cursor_up_scroll(struct screen *, u_int);
void screen_cursor_down_scroll(struct screen *, u_int);
void screen_scroll_up(struct screen *, u_int);
void screen_scroll_down(struct screen *, u_int);
void screen_fill_screen(struct screen *, u_char, u_char, u_char);
void screen_fill_line(struct screen *, u_int, u_char, u_char, u_char);
void screen_fill_end_of_screen(
struct screen *, u_int, u_int, u_char, u_char, u_char);
void screen_fill_end_of_line(
struct screen *, u_int, u_int, u_char, u_char, u_char);
void screen_fill_start_of_line(
struct screen *, u_int, u_int, u_char, u_char, u_char);
void screen_insert_lines(struct screen *, u_int, u_int);
void screen_delete_lines(struct screen *, u_int, u_int);
void screen_insert_characters(struct screen *, u_int, u_int, u_int);
void screen_delete_characters(struct screen *, u_int, u_int, u_int);
#define SCREEN_DEFDATA ' '
#define SCREEN_DEFATTR 0
#define SCREEN_DEFCOLR 0x88
#define screen_last_y(s) ((s)->sy - 1)
#define screen_last_x(s) ((s)->sx - 1)
/* Create a new screen. */
void
screen_create(struct screen *s, u_int sx, u_int sy)
{
s->sx = sx;
s->sy = sy;
s->cx = 0;
s->cy = 0;
s->ry_upper = 0;
s->ry_lower = screen_last_y(s);
s->attr = SCREEN_DEFATTR;
s->colr = SCREEN_DEFCOLR;
s->mode = MODE_CURSOR;
*s->title = '\0';
s->grid_data = xmalloc(sy * (sizeof *s->grid_data));
s->grid_attr = xmalloc(sy * (sizeof *s->grid_attr));
s->grid_colr = xmalloc(sy * (sizeof *s->grid_colr));
screen_make_lines(s, 0, screen_last_y(s));
screen_fill_screen(s, SCREEN_DEFDATA, 0, SCREEN_DEFCOLR);
}
/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy)
{
u_int i, ox, oy, ny;
if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
ox = s->sx;
oy = s->sy;
s->sx = sx;
s->sy = sy;
log_debug("resizing screen (%u, %u) -> (%u, %u)", ox, oy, sx, sy);
if (sy < oy) {
ny = oy - sy;
if (ny > s->cy)
ny = s->cy;
if (ny != 0) {
log_debug("removing %u lines from top", ny);
for (i = 0; i < ny; i++) {
log_debug("freeing line %u", i);
xfree(s->grid_data[i]);
xfree(s->grid_attr[i]);
xfree(s->grid_colr[i]);
}
memmove(s->grid_data, s->grid_data + ny,
(oy - ny) * (sizeof *s->grid_data));
memmove(s->grid_attr, s->grid_attr + ny,
(oy - ny) * (sizeof *s->grid_attr));
memmove(s->grid_colr, s->grid_colr + ny,
(oy - ny) * (sizeof *s->grid_colr));
s->cy -= ny;
}
if (ny < oy - sy) {
log_debug(
"removing %u lines from bottom", oy - sy - ny);
for (i = sy; i < oy - ny; i++) {
log_debug("freeing line %u", i);
xfree(s->grid_data[i]);
xfree(s->grid_attr[i]);
xfree(s->grid_colr[i]);
}
if (s->cy >= sy)
s->cy = sy - 1;
}
}
if (sy != oy) {
s->grid_data = xrealloc(s->grid_data, sy, sizeof *s->grid_data);
s->grid_attr = xrealloc(s->grid_attr, sy, sizeof *s->grid_attr);
s->grid_colr = xrealloc(s->grid_colr, sy, sizeof *s->grid_colr);
}
if (sy > oy) {
for (i = oy; i < sy; i++) {
log_debug("allocating line %u", i);
s->grid_data[i] = xmalloc(sx);
s->grid_attr[i] = xmalloc(sx);
s->grid_colr[i] = xmalloc(sx);
screen_fill_line(s, i,
SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
sy = oy;
}
if (sx != ox) {
for (i = 0; i < sy; i++) {
log_debug("adjusting line %u to %u", i, sx);
s->grid_data[i] = xrealloc(s->grid_data[i], sx, 1);
s->grid_attr[i] = xrealloc(s->grid_attr[i], sx, 1);
s->grid_colr[i] = xrealloc(s->grid_colr[i], sx, 1);
if (sx > ox) {
screen_fill_end_of_line(s, ox, i,
SCREEN_DEFDATA, SCREEN_DEFATTR,
SCREEN_DEFCOLR);
}
}
if (s->cx >= sx)
s->cx = sx - 1;
}
}
/* Draw a set of lines on the screen. */
void
screen_draw(struct screen *s, struct buffer *b, u_int uy, u_int ly)
{
u_char attr, colr;
size_t size;
u_int i, j;
uint16_t n;
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
log_fatalx("screen_draw_lines: bad range");
/* XXX. This is naive and rough right now. */
attr = 0;
colr = SCREEN_DEFCOLR;
input_store_zero(b, CODE_CURSOROFF);
input_store_one(b, CODE_ATTRIBUTES, 0);
for (j = uy; j <= ly; j++) {
input_store_two(b, CODE_CURSORMOVE, j + 1, 1);
for (i = 0; i <= screen_last_x(s); i++) {
size = BUFFER_USED(b);
input_store_one(b, CODE_ATTRIBUTES, 0);
n = 0;
if (s->grid_attr[j][i] != attr) {
attr = s->grid_attr[j][i];
n += screen_store_attributes(b, attr);
if (attr == 0)
colr = SCREEN_DEFCOLR;
}
if (s->grid_colr[j][i] != colr) {
colr = s->grid_colr[j][i];
n += screen_store_colours(b, colr);
}
if (n == 0)
buffer_reverse_add(b, 4);
else {
size = BUFFER_USED(b) - size;
memcpy(BUFFER_IN(b) - size + 2, &n, 2);
}
input_store8(b, s->grid_data[j][i]);
}
}
size = BUFFER_USED(b);
input_store_one(b, CODE_ATTRIBUTES, 0);
n = screen_store_attributes(b, s->attr);
n += screen_store_colours(b, s->colr);
size = BUFFER_USED(b) - size;
memcpy(BUFFER_IN(b) - size + 2, &n, 2);
input_store_two(b, CODE_CURSORMOVE, s->cy + 1, s->cx + 1);
if (s->mode & MODE_CURSOR)
input_store_zero(b, CODE_CURSORON);
}
/* Store screen atttributes in buffer. */
size_t
screen_store_attributes(struct buffer *b, u_char attr)
{
size_t n;
if (attr == 0) {
input_store16(b, 0);
return (1);
}
n = 0;
if (attr & ATTR_BRIGHT) {
input_store16(b, 1);
n++;
}
if (attr & ATTR_DIM) {
input_store16(b, 2);
n++;
}
if (attr & ATTR_ITALICS) {
input_store16(b, 3);
n++;
}
if (attr & ATTR_UNDERSCORE) {
input_store16(b, 4);
n++;
}
if (attr & ATTR_BLINK) {
input_store16(b, 5);
n++;
}
if (attr & ATTR_REVERSE) {
input_store16(b, 7);
n++;
}
if (attr & ATTR_HIDDEN) {
input_store16(b, 8);
n++;
}
return (n);
}
/* Store screen colours in buffer. */
size_t
screen_store_colours(struct buffer *b, u_char colr)
{
uint16_t v;
v = colr >> 4;
if (v == 8)
v = 9;
input_store16(b, 30 + v);
v = colr & 0xf;
if (v == 8)
v = 9;
input_store16(b, 40 + v);
return (2);
}
/* Make a range of lines. */
void
screen_make_lines(struct screen *s, u_int uy, u_int ly)
{
u_int i;
log_debug("making lines %u:%u", uy, ly);
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
log_fatalx("screen_make_lines: bad range");
for (i = uy; i <= ly; i++) {
s->grid_data[i] = xmalloc(s->sx);
s->grid_attr[i] = xmalloc(s->sx);
s->grid_colr[i] = xmalloc(s->sx);
}
}
/* Free a range of lines. */
void
screen_free_lines(struct screen *s, u_int uy, u_int ly)
{
u_int i;
log_debug("freeing lines %u:%u", uy, ly);
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
log_fatalx("screen_free_lines: bad range");
for (i = uy; i <= ly; i++) {
xfree(s->grid_data[i]);
s->grid_data[i] = (u_char *) 0xffffffff;
xfree(s->grid_attr[i]);
s->grid_attr[i] = (u_char *) 0xffffffff;
xfree(s->grid_colr[i]);
s->grid_colr[i] = (u_char *) 0xffffffff;
}
}
/* Move a range of lines. */
void
screen_move_lines(struct screen *s, u_int dy, u_int uy, u_int ly)
{
u_int ny;
log_debug("moving lines %u:%u to %u", uy, ly, dy);
ny = (ly - uy) + 1;
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
log_fatalx("screen_move_lines: bad range");
if (dy > screen_last_y(s))
log_fatalx("screen_move_lines: bad destination");
if (dy + ny - 1 > screen_last_y(s))
log_fatalx("screen_move_lines: bad destination");
memmove(
s->grid_data + dy, s->grid_data + uy, ny * (sizeof *s->grid_data));
memmove(
s->grid_attr + dy, s->grid_attr + uy, ny * (sizeof *s->grid_attr));
memmove(
s->grid_colr + dy, s->grid_colr + uy, ny * (sizeof *s->grid_colr));
}
/* Fill a range of lines. */
void
screen_fill_lines(
struct screen *s, u_int uy, u_int ly, u_char data, u_char attr, u_char colr)
{
u_int i;
log_debug("filling lines %u:%u", uy, ly);
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
log_fatalx("screen_fill_lines: bad range");
for (i = uy; i <= ly; i++)
screen_fill_line(s, i, data, attr, colr);
}
/* Update screen with character. */
void
screen_character(struct screen *s, u_char ch)
{
switch (ch) {
case '\n': /* LF */
screen_cursor_down_scroll(s, 1);
break;
case '\r': /* CR */
s->cx = 0;
break;
case '\010': /* BS */
if (s->cx > 0)
s->cx--;
break;
default:
if (ch < ' ')
log_fatalx("screen_character: bad control: %hhu", ch);
screen_write_character(s, ch);
break;
}
}
/* Extract 16-bit value from pointer. */
uint16_t
screen_extract(u_char *ptr)
{
uint16_t n;
memcpy(&n, ptr, sizeof n);
return (n);
}
/* Update screen with escape sequence. */
void
screen_sequence(struct screen *s, u_char *ptr)
{
uint16_t ua, ub;
ptr++;
log_debug("processing code %hhu", *ptr);
switch (*ptr++) {
case CODE_CURSORUP:
ua = screen_extract(ptr);
if (ua > s->cy)
ua = s->cy;
s->cy -= ua;
break;
case CODE_CURSORDOWN:
ua = screen_extract(ptr);
if (s->cy + ua > screen_last_y(s))
ua = screen_last_y(s) - s->cy;
s->cy += ua;
break;
case CODE_CURSORLEFT:
ua = screen_extract(ptr);
if (ua > s->cx)
ua = s->cx;
s->cx -= ua;
break;
case CODE_CURSORRIGHT:
ua = screen_extract(ptr);
if (s->cx + ua > screen_last_x(s))
ua = screen_last_x(s) - s->cx;
s->cx += ua;
break;
case CODE_CURSORMOVE:
ua = screen_extract(ptr);
ptr += 2;
ub = screen_extract(ptr);
if (ub > s->sx)
ub = s->sx;
s->cx = ub - 1;
if (ua > s->sy)
ua = s->sy;
s->cy = ua - 1;
break;
case CODE_CLEARENDOFSCREEN:
screen_fill_end_of_screen(
s, s->cx, s->cy, SCREEN_DEFDATA, s->attr, s->colr);
break;
case CODE_CLEARSCREEN:
screen_fill_screen(s, SCREEN_DEFDATA, s->attr, s->colr);
break;
case CODE_CLEARENDOFLINE:
screen_fill_end_of_line(
s, s->cx, s->cy, SCREEN_DEFDATA, s->attr, s->colr);
break;
case CODE_CLEARSTARTOFLINE:
screen_fill_start_of_line(
s, s->cx, s->cy, SCREEN_DEFDATA, s->attr, s->colr);
break;
case CODE_CLEARLINE:
screen_fill_line(s, s->cy, SCREEN_DEFDATA, s->attr, s->colr);
break;
case CODE_INSERTLINE:
ua = screen_extract(ptr);
screen_insert_lines(s, s->cy, ua);
break;
case CODE_DELETELINE:
ua = screen_extract(ptr);
screen_delete_lines(s, s->cy, ua);
break;
case CODE_INSERTCHARACTER:
ua = screen_extract(ptr);
screen_insert_characters(s, s->cx, s->cy, ua);
break;
case CODE_DELETECHARACTER:
ua = screen_extract(ptr);
screen_delete_characters(s, s->cx, s->cy, ua);
break;
case CODE_CURSORON:
s->mode |= MODE_CURSOR;
break;
case CODE_CURSOROFF:
s->mode &= ~MODE_CURSOR;
break;
case CODE_CURSORDOWNSCROLL:
ua = screen_extract(ptr);
screen_cursor_down_scroll(s, ua);
break;
case CODE_CURSORUPSCROLL:
ua = screen_extract(ptr);
screen_cursor_up_scroll(s, ua);
break;
case CODE_SCROLLREGION:
ua = screen_extract(ptr);
ptr += 2;
ub = screen_extract(ptr);
if (ua > s->sy)
ua = s->sy;
s->ry_upper = ua - 1;
if (ub > s->sy)
ub = s->sy;
s->ry_lower = ub - 1;
break;
case CODE_INSERTOFF:
s->mode &= ~MODE_INSERT;
break;
case CODE_INSERTON:
s->mode |= MODE_INSERT;
break;
case CODE_KCURSOROFF:
s->mode &= ~MODE_KCURSOR;
break;
case CODE_KCURSORON:
s->mode |= MODE_KCURSOR;
break;
case CODE_KKEYPADOFF:
s->mode &= ~MODE_KKEYPAD;
break;
case CODE_KKEYPADON:
s->mode |= MODE_KKEYPAD;
break;
case CODE_TITLE:
ua = screen_extract(ptr);
ptr += 2;
log_debug("new title: %u:%.*s", ua, (int) ua, ptr);
if (ua > MAXTITLELEN - 1)
ua = MAXTITLELEN - 1;
memcpy(s->title, ptr, ua);
s->title[ua] = '\0';
break;
case CODE_ATTRIBUTES:
ua = screen_extract(ptr);
if (ua == 0) {
s->attr = 0;
s->colr = SCREEN_DEFCOLR;
break;
}
while (ua-- > 0) {
ptr += 2;
ub = screen_extract(ptr);
switch (ub) {
case 0:
case 10:
s->attr = 0;
s->colr = SCREEN_DEFCOLR;
break;
case 1:
s->attr |= ATTR_BRIGHT;
break;
case 2:
s->attr |= ATTR_DIM;
break;
case 3:
s->attr |= ATTR_ITALICS;
break;
case 4:
s->attr |= ATTR_UNDERSCORE;
break;
case 5:
s->attr |= ATTR_BLINK;
break;
case 7:
s->attr |= ATTR_REVERSE;
break;
case 8:
s->attr |= ATTR_HIDDEN;
break;
case 23:
s->attr &= ~ATTR_ITALICS;
break;
case 24:
s->attr &= ~ATTR_UNDERSCORE;
break;
case 30:
case 31:
case 32:
case 33:
case 34:
case 35:
case 36:
case 37:
s->colr &= 0x0f;
s->colr |= (ub - 30) << 4;
break;
case 39:
s->colr &= 0x0f;
s->colr |= 0x80;
break;
case 40:
case 41:
case 42:
case 43:
case 44:
case 45:
case 46:
case 47:
s->colr &= 0xf0;
s->colr |= ub - 40;
break;
case 49:
s->colr &= 0xf0;
s->colr |= 0x08;
break;
}
}
}
}
/* Write a single character to the screen at the cursor and move forward. */
void
screen_write_character(struct screen *s, u_char ch)
{
s->grid_data[s->cy][s->cx] = ch;
s->grid_attr[s->cy][s->cx] = s->attr;
s->grid_colr[s->cy][s->cx] = s->colr;
s->cx++;
if (s->cx > screen_last_x(s)) {
s->cx = 0;
screen_cursor_down_scroll(s, 1);
}
}
/* Move cursor up and scroll if necessary. */
void
screen_cursor_up_scroll(struct screen *s, u_int ny)
{
if (s->cy < ny) {
screen_scroll_down(s, ny - s->cy);
s->cy = 0;
} else
s->cy -= ny;
}
/* Move cursor down and scroll if necessary. */
void
screen_cursor_down_scroll(struct screen *s, u_int ny)
{
if (screen_last_y(s) - s->cy < ny) {
screen_scroll_up(s, ny - (screen_last_y(s) - s->cy));
s->cy = screen_last_y(s);
} else
s->cy += ny;
}
/* Scroll screen up. */
void
screen_scroll_up(struct screen *s, u_int ny)
{
if (s->ry_upper == 0 && s->ry_lower == screen_last_y(s)) {
screen_delete_lines(s, 0, ny);
return;
}
log_fatalx("screen_scroll_up: %u %u", s->ry_upper, s->ry_lower);
}
/* Scroll screen down. */
void
screen_scroll_down(struct screen *s, u_int ny)
{
if (s->ry_upper == 0 && s->ry_lower == screen_last_y(s)) {
screen_insert_lines(s, 0, ny);
return;
}
log_fatalx("screen_scroll_down: %u %u", s->ry_upper, s->ry_lower);
}
/* Fill entire screen. */
void
screen_fill_screen(struct screen *s, u_char data, u_char attr, u_char colr)
{
screen_fill_end_of_screen(s, 0, 0, data, attr, colr);
}
/* Fill single line. */
void
screen_fill_line(
struct screen *s, u_int py, u_char data, u_char attr, u_char colr)
{
screen_fill_end_of_line(s, 0, py, data, attr, colr);
}
/* Fill to end of screen. */
void
screen_fill_end_of_screen(
struct screen *s, u_int px, u_int py, u_char data, u_char attr, u_char colr)
{
if (py > screen_last_y(s))
return;
if (px != 0) {
screen_fill_end_of_line(s, px, py, data, attr, colr);
if (py++ > screen_last_y(s))
return;
}
while (py <= screen_last_y(s)) {
screen_fill_line(s, py, data, attr, colr);
py++;
}
}
/* Fill to end of line. */
void
screen_fill_end_of_line(
struct screen *s, u_int px, u_int py, u_char data, u_char attr, u_char colr)
{
if (px > screen_last_x(s))
return;
if (py > screen_last_y(s))
return;
memset(s->grid_data[py] + px, data, s->sx - px);
memset(s->grid_attr[py] + px, attr, s->sx - px);
memset(s->grid_colr[py] + px, colr, s->sx - px);
}
/* Fill to start of line. */
void
screen_fill_start_of_line(
struct screen *s, u_int px, u_int py, u_char data, u_char attr, u_char colr)
{
if (px > screen_last_x(s))
return;
if (py > screen_last_y(s))
return;
memset(s->grid_data[py], data, px);
memset(s->grid_attr[py], attr, px);
memset(s->grid_colr[py], colr, px);
}
/* Insert lines. */
void
screen_insert_lines(struct screen *s, u_int py, u_int ny)
{
if (py > screen_last_y(s))
return;
if (py + ny > screen_last_y(s))
ny = screen_last_y(s) - py;
log_debug("inserting lines: %u,%u", py, ny);
screen_free_lines(s, (screen_last_y(s) - ny) + 1, screen_last_y(s));
if (py != screen_last_y(s))
screen_move_lines(s, py + ny, py, screen_last_y(s) - ny);
screen_fill_lines(
s, py, py + ny - 1, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Delete lines. */
void
screen_delete_lines(struct screen *s, u_int py, u_int ny)
{
if (py > screen_last_y(s))
return;
if (py + ny > screen_last_y(s))
ny = screen_last_y(s) - py;
log_debug("deleting lines: %u,%u", py, ny);
screen_free_lines(s, py, py + ny - 1);
if (py != screen_last_y(s))
screen_move_lines(s, py, py + ny, screen_last_y(s));
screen_make_lines(s, (screen_last_y(s) - ny) + 1, screen_last_y(s));
screen_fill_lines(s, (screen_last_y(s) - ny) + 1,
screen_last_y(s), SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Insert characters. */
void
screen_insert_characters(struct screen *s, u_int px, u_int py, u_int nx)
{
if (px >= s->sx || py >= s->sy)
return;
if (px + nx > s->sx)
nx = s->sx - px;
if (px - nx != s->sx) {
memmove(s->grid_data[py] + px + nx,
s->grid_data[py] + px, s->sx - px - nx);
memmove(s->grid_attr[py] + px + nx,
s->grid_attr[py] + px, s->sx - px - nx);
memmove(s->grid_colr[py] + px + nx,
s->grid_colr[py] + px, s->sx - px - nx);
}
memset(s->grid_data[py] + px, SCREEN_DEFDATA, nx);
memset(s->grid_attr[py] + px, SCREEN_DEFATTR, nx);
memset(s->grid_colr[py] + px, SCREEN_DEFCOLR, nx);
}
/* Delete characters. */
void
screen_delete_characters(struct screen *s, u_int px, u_int py, u_int nx)
{
if (px >= s->sx || py >= s->sy)
return;
if (px + nx > s->sx)
nx = s->sx - px;
if (px - nx != s->sx) {
memmove(s->grid_data[py] + px,
s->grid_data[py] + px + nx, s->sx - px - nx);
memmove(s->grid_attr[py] + px,
s->grid_attr[py] + px + nx, s->sx - px - nx);
memmove(s->grid_colr[py] + px,
s->grid_colr[py] + px + nx, s->sx - px - nx);
}
memset(s->grid_data[py] + px + nx, SCREEN_DEFDATA, s->sx - px - nx);
memset(s->grid_attr[py] + px + nx, SCREEN_DEFATTR, s->sx - px - nx);
memset(s->grid_colr[py] + px + nx, SCREEN_DEFCOLR, s->sx - px - nx);
}
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