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/* $Id: screen.c,v 1.23 2007-10-12 13:51:44 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 terminal emulator.
*
* XXX Much of this file sucks.
*/
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);
#define screen_last_y(s) ((s)->sy - 1)
#define screen_last_x(s) ((s)->sx - 1)
#define screen_range_y(lx, rx) (((rx) - (lx)) + 1)
#define screen_range_x(ux, lx) (((lx) - (ux)) + 1)
#define screen_offset_y(py, ny) ((py) + (ny) - 1)
#define screen_offset_x(px, nx) ((px) + (nx) - 1)
/* Colour to string. */
const char *
screen_colourstring(u_char c)
{
switch (c) {
case 0:
return ("black");
case 1:
return ("red");
case 2:
return ("green");
case 3:
return ("yellow");
case 4:
return ("blue");
case 5:
return ("magenta");
case 6:
return ("cyan");
case 7:
return ("white");
case 8:
return ("default");
}
return (NULL);
}
/* String to colour. */
u_char
screen_stringcolour(const char *s)
{
if (strcasecmp(s, "black") == 0 || (s[0] == '0' && s[1] == '\0'))
return (0);
if (strcasecmp(s, "red") == 0 || (s[0] == '1' && s[1] == '\0'))
return (1);
if (strcasecmp(s, "green") == 0 || (s[0] == '2' && s[1] == '\0'))
return (2);
if (strcasecmp(s, "yellow") == 0 || (s[0] == '3' && s[1] == '\0'))
return (3);
if (strcasecmp(s, "blue") == 0 || (s[0] == '4' && s[1] == '\0'))
return (4);
if (strcasecmp(s, "magenta") == 0 || (s[0] == '5' && s[1] == '\0'))
return (5);
if (strcasecmp(s, "cyan") == 0 || (s[0] == '6' && s[1] == '\0'))
return (6);
if (strcasecmp(s, "white") == 0 || (s[0] == '7' && s[1] == '\0'))
return (7);
if (strcasecmp(s, "default") == 0 || (s[0] == '8' && s[1] == '\0'))
return (8);
return (255);
}
/* 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, sy);
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 == s->sx && sy == s->sy)
return;
if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
ox = s->sx;
oy = s->sy;
log_debug("resizing screen (%u, %u) -> (%u, %u)", ox, oy, sx, sy);
s->sx = sx;
s->sy = sy;
s->ry_upper = 0;
s->ry_lower = screen_last_y(s);
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;
}
}
/* Destroy a screen. */
void
screen_destroy(struct screen *s)
{
screen_free_lines(s, 0, s->sy);
xfree(s->grid_data);
xfree(s->grid_attr);
xfree(s->grid_colr);
}
/* 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;
u_int i, j;
if (uy > screen_last_y(s) || ly > screen_last_y(s) || ly < uy)
fatalx("bad range");
/* XXX. This is naive and rough right now. */
attr = 0;
colr = SCREEN_DEFCOLR;
input_store_two(b, CODE_SCROLLREGION, s->ry_upper + 1, s->ry_lower + 1);
input_store_zero(b, CODE_CURSOROFF);
input_store_two(b, CODE_ATTRIBUTES, attr, colr);
for (j = uy; j <= ly; j++) {
input_store_two(b, CODE_CURSORMOVE, j + 1, 1);
for (i = 0; i <= screen_last_x(s); i++) {
if (s->grid_attr[j][i] != attr ||
s->grid_colr[j][i] != colr) {
input_store_two(b, CODE_ATTRIBUTES,
s->grid_attr[j][i], s->grid_colr[j][i]);
attr = s->grid_attr[j][i];
colr = s->grid_colr[j][i];
}
input_store8(b, s->grid_data[j][i]);
}
}
input_store_two(b, CODE_CURSORMOVE, s->cy + 1, s->cx + 1);
input_store_two(b, CODE_ATTRIBUTES, s->attr, s->colr);
if (s->mode & MODE_CURSOR)
input_store_zero(b, CODE_CURSORON);
}
/* Make a range of lines. */
void
screen_make_lines(struct screen *s, u_int py, u_int ny)
{
u_int i;
log_debug("making lines %u,%u", py, ny);
if (py > screen_last_y(s) || py + ny - 1 > screen_last_y(s))
fatalx("bad range");
for (i = py; i < py + ny; 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 py, u_int ny)
{
u_int i;
log_debug("freeing lines %u,%u", py, ny);
if (py > screen_last_y(s) || py + ny - 1 > screen_last_y(s))
fatalx("bad range");
for (i = py; i < py + ny; i++) {
xfree(s->grid_data[i]);
xfree(s->grid_attr[i]);
xfree(s->grid_colr[i]);
}
}
/* Move a range of lines. */
void
screen_move_lines(struct screen *s, u_int dy, u_int py, u_int ny)
{
log_debug("moving lines %u,%u to %u", py, ny, dy);
if (py > screen_last_y(s) || py + ny - 1 > screen_last_y(s))
fatalx("bad range");
if (dy > screen_last_y(s) || dy == py)
fatalx("bad destination");
if (dy + ny - 1 > screen_last_y(s))
fatalx("bad size");
memmove(
&s->grid_data[dy], &s->grid_data[py], ny * (sizeof *s->grid_data));
memmove(
&s->grid_attr[dy], &s->grid_attr[py], ny * (sizeof *s->grid_attr));
memmove(
&s->grid_colr[dy], &s->grid_colr[py], ny * (sizeof *s->grid_colr));
}
/* Fill a range of lines. */
void
screen_fill_lines(
struct screen *s, u_int py, u_int ny, u_char data, u_char attr, u_char colr)
{
u_int i;
log_debug("filling lines %u,%u", py, ny);
if (py > screen_last_y(s) || py + ny - 1 > screen_last_y(s))
fatalx("bad range");
for (i = py; i < py + ny; i++)
screen_fill_line(s, i, data, attr, colr);
}
/* Write a single character to the screen at the cursor. */
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;
}
/* Move cursor up and scroll if necessary. */
void
screen_cursor_up_scroll(struct screen *s)
{
if (s->cy == s->ry_upper)
screen_scroll_region_down(s);
else if (s->cy > 0)
s->cy--;
}
/* Move cursor down and scroll if necessary. */
void
screen_cursor_down_scroll(struct screen *s)
{
if (s->cy == s->ry_lower)
screen_scroll_region_up(s);
else if (s->cy < screen_last_y(s))
s->cy++;
}
/* Scroll region up. */
void
screen_scroll_region_up(struct screen *s)
{
log_debug("scrolling region up: %u:%u", s->ry_upper, s->ry_lower);
/*
* Scroll scrolling region up:
* - delete ry_upper
* - move ry_upper + 1 to ry_lower to ry_upper
* - make new line at ry_lower
*
* Example: region is 12 to 24.
* ry_lower = 24, ry_upper = 12
* screen_free_lines(s, 12, 1);
* screen_move_lines(s, 12, 13, 12);
* screen_make_lines(s, 24, 1);
*/
screen_free_lines(s, s->ry_upper, 1);
if (s->ry_upper != s->ry_lower) {
screen_move_lines(s,
s->ry_upper, s->ry_upper + 1, s->ry_lower - s->ry_upper);
}
screen_make_lines(s, s->ry_lower, 1);
screen_fill_lines(
s, s->ry_lower, 1, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Scroll region down. */
void
screen_scroll_region_down(struct screen *s)
{
log_debug("scrolling region down: %u:%u", s->ry_upper, s->ry_lower);
/*
* Scroll scrolling region down:
* - delete ry_lower
* - move ry_upper to ry_lower - 1 to ry_upper + 1
* - make new line at ry_upper
*
* Example: region is 12 to 24.
* ry_lower = 24, ry_upper = 12
* screen_free_lines(s, 24, 1);
* screen_move_lines(s, 13, 12, 12);
* screen_make_lines(s, 12, 1);
*/
screen_free_lines(s, s->ry_lower, 1);
if (s->ry_upper != s->ry_lower) {
screen_move_lines(s,
s->ry_upper + 1, s->ry_upper, s->ry_lower - s->ry_upper);
}
screen_make_lines(s, s->ry_upper, 1);
screen_fill_lines(
s, s->ry_upper, 1, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Scroll screen up. */
void
screen_scroll_up(struct screen *s, u_int ny)
{
screen_delete_lines(s, 0, ny);
}
/* Scroll screen down. */
void
screen_scroll_down(struct screen *s, u_int ny)
{
screen_insert_lines(s, 0, ny);
}
/* 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);
/*
* Insert range of ny lines at py:
* - Free ny lines from end of screen.
* - Move from py to end of screen - ny to py + ny.
* - Create ny lines at py.
*
* Example: insert 2 lines at 4.
* sy = 10, py = 4, ny = 2
* screen_free_lines(s, 8, 2); - delete lines 8,9
* screen_move_lines(s, 6, 4, 4); - move 4,5,6,7 to 6,7,8,9
* screen_make_lines(s, 4, 2); - make lines 4,5
*/
screen_free_lines(s, s->sy - ny, ny);
if (py != screen_last_y(s))
screen_move_lines(s, py + ny, py, s->sy - py - ny);
screen_make_lines(s, py, ny);
screen_fill_lines(
s, py, ny, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Insert lines in region. */
void
screen_insert_lines_region(struct screen *s, u_int py, u_int ny)
{
if (py < s->ry_upper || py > s->ry_lower)
return;
if (py + ny > s->ry_lower)
ny = s->ry_lower - py;
log_debug("inserting lines in region: %u,%u (%u,%u)", py, ny,
s->ry_upper, s->ry_lower);
/*
* Insert range of ny lines at py:
* - Free ny lines from end of screen.
* - Move from py to end of screen - ny to py + ny.
* - Create ny lines at py.
*
* Example: insert 2 lines at 4.
* ryu = 11, ryl = 16, py = 13, ny = 2
* screen_free_lines(s, 15, 2); - delete lines 15,16
* screen_move_lines(s, 13, 15, 2);- move 13,14 to 15,16
* screen_make_lines(s, 13, 2); - make lines 13,14
*/
screen_free_lines(s, (s->ry_lower + 1) - ny, ny);
if (py != s->ry_lower)
screen_move_lines(s, py + ny, py, (s->ry_lower + 1) - py - ny);
screen_make_lines(s, py, ny);
screen_fill_lines(
s, py, ny, 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);
/*
* Delete range of ny lines at py:
* - Free ny lines at py.
* - Move from py + ny to end of screen to py.
* - Free and recreate last ny lines.
*
* Example: delete lines 3,4.
* sy = 10, py = 3, ny = 2
* screen_free_lines(s, 3, 2); - delete lines 3,4
* screen_move_lines(s, 3, 5, 5); - move 5,6,7,8,9 to 3
* screen_make_lines(s, 8, 2); - make lines 8,9
*/
screen_free_lines(s, py, ny);
if (py != screen_last_y(s))
screen_move_lines(s, py, py + ny, s->sy - py - ny);
screen_make_lines(s, s->sy - ny, ny);
screen_fill_lines(
s, s->sy - ny, ny, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Delete lines inside scroll region. */
void
screen_delete_lines_region(struct screen *s, u_int py, u_int ny)
{
if (py < s->ry_upper || py > s->ry_lower)
return;
if (py + ny > s->ry_lower)
ny = s->ry_lower - py;
log_debug("deleting lines in region: %u,%u (%u,%u)", py, ny,
s->ry_upper, s->ry_lower);
/*
* Delete range of ny lines at py:
* - Free ny lines at py.
* - Move from py + ny to end of region to py.
* - Free and recreate last ny lines.
*
* Example: delete lines 13,14.
* ryu = 11, ryl = 16, py = 13, ny = 2
* screen_free_lines(s, 13, 2); - delete lines 13,14
* screen_move_lines(s, 15, 16, 2);- move 15,16 to 13
* screen_make_lines(s, 15, 16); - make lines 15,16
*/
screen_free_lines(s, py, ny);
if (py != s->ry_lower)
screen_move_lines(s, py, py + ny, (s->ry_lower + 1) - py - ny);
screen_make_lines(s, (s->ry_lower + 1) - ny, ny);
screen_fill_lines(s, (s->ry_lower + 1) - ny,
ny, SCREEN_DEFDATA, SCREEN_DEFATTR, SCREEN_DEFCOLR);
}
/* Insert characters. */
void
screen_insert_characters(struct screen *s, u_int px, u_int py, u_int nx)
{
u_int lx, rx;
if (px > screen_last_x(s) || py > screen_last_y(s))
return;
lx = px;
rx = screen_offset_x(px, nx);
if (rx > screen_last_x(s))
rx = screen_last_x(s);
/*
* Inserting a range from lx to rx, inclusive.
*
* - If rx is not the last x, move from lx to rx + 1.
* - Clear the range from lx to rx.
*/
if (rx != screen_last_x(s)) {
nx = screen_range_x(rx + 1, screen_last_x(s));
memmove(&s->grid_data[py][rx + 1], &s->grid_data[py][lx], nx);
memmove(&s->grid_attr[py][rx + 1], &s->grid_attr[py][lx], nx);
memmove(&s->grid_colr[py][rx + 1], &s->grid_colr[py][lx], nx);
}
memset(&s->grid_data[py][lx], SCREEN_DEFDATA, screen_range_x(lx, rx));
memset(&s->grid_attr[py][lx], SCREEN_DEFATTR, screen_range_x(lx, rx));
memset(&s->grid_colr[py][lx], SCREEN_DEFCOLR, screen_range_x(lx, rx));
}
/* Delete characters. */
void
screen_delete_characters(struct screen *s, u_int px, u_int py, u_int nx)
{
u_int lx, rx;
if (px > screen_last_x(s) || py > screen_last_y(s))
return;
lx = px;
rx = screen_offset_x(px, nx);
if (rx > screen_last_x(s))
rx = screen_last_x(s);
/*
* Deleting the range from lx to rx, inclusive.
*
* - If rx is not the last x, move the range from rx + 1 to lx.
* - Clear the range from the last x - (rx - lx) to the last x.
*/
if (rx != screen_last_x(s)) {
nx = screen_range_x(rx + 1, screen_last_x(s));
memmove(&s->grid_data[py][lx], &s->grid_data[py][rx + 1], nx);
memmove(&s->grid_attr[py][lx], &s->grid_attr[py][rx + 1], nx);
memmove(&s->grid_colr[py][lx], &s->grid_colr[py][rx + 1], nx);
}
/* If lx == rx, then nx = 1. */
nx = screen_range_x(lx, rx);
memset(&s->grid_data[py][s->sx - nx], SCREEN_DEFDATA, nx);
memset(&s->grid_attr[py][s->sx - nx], SCREEN_DEFATTR, nx);
memset(&s->grid_colr[py][s->sx - nx], SCREEN_DEFCOLR, nx);
}
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