tmux/screen.c

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/* $Id: screen.c,v 1.56 2007-12-06 09:46:23 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"
/*
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* Virtual screen.
*
* A screen is stored as three arrays of lines of 8-bit values, one for the
* actual characters (data), one for attributes and one for colours. Three
* seperate blocks means memset and friends can be used. Each array is y by x
* in size, row then column order. Sizes are 0-based. There is an additional
* array of u_ints with the size of each line.
*
* Each screen has a history starting at the beginning of the arrays and
* extending for hsize lines. Beyond that is the screen display of size
* dy:
*
* ----------- array base
* | |
* | history |
* ----------- array base + hsize
* | |
* | display |
* | |
* ----------- array base + hsize + dy
*
* The screen_x/screen_y macros are used to convert a cell on the displayed
* area to an absolute position in the arrays.
*
* Screen handling code is split into four files:
*
* screen.c: Creation/deletion, utility functions, and basic functions to
* manipulate the screen based on offsets from the base.
* screen-display.c: Basic functions for manipulating the displayed
* part of the screen. x,y coordinates passed to these
* are relative to the display. These are largely
* utility functions for screen-write.c.
* screen-redraw.c: Functions for redrawing all or part of a screen to
* one or more ttys. A context is filled via one of the
* screen_redraw_start* variants which sets up (removes
* cursor etc) and figures out which tty_write_* function
* to use to write to the terminals, then the other
* screen_redraw_* functions are used to draw the screen,
* and screen_redraw_stop used to reset the cursor and
* clean up. These are used when changing window and a
* few other bits (status line).
* screen-write.c: Functions for modifying (writing into) the screen and
* optionally simultaneously updating one or more ttys.
* These are used in much the same way as the redraw
* functions. These are used to update when parsing
* input from the window (input.c) and for the various
* other modes which maintain private screens.
*
* If you're thinking this all seems too complicated, that's because it is :-/.
*/
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/* 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 dx, u_int dy)
{
s->dx = dx;
s->dy = dy;
s->cx = 0;
s->cy = 0;
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s->rupper = 0;
s->rlower = s->dy - 1;
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s->hsize = 0;
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s->hlimit = history_limit;
s->attr = SCREEN_DEFATTR;
s->colr = SCREEN_DEFCOLR;
s->mode = MODE_CURSOR;
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s->title = xstrdup("");
s->grid_data = xmalloc(dy * (sizeof *s->grid_data));
s->grid_attr = xmalloc(dy * (sizeof *s->grid_attr));
s->grid_colr = xmalloc(dy * (sizeof *s->grid_colr));
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s->grid_size = xmalloc(dy * (sizeof *s->grid_size));
screen_make_lines(s, 0, dy);
screen_clear_selection(s);
}
/* Resize screen. */
void
screen_resize(struct screen *s, u_int sx, u_int sy)
{
u_int i, ox, oy, ny, my;
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if (sx < 1)
sx = 1;
if (sy < 1)
sy = 1;
ox = s->dx;
oy = s->dy;
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if (sx == ox && sy == oy)
return;
/*
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* X dimension.
*/
if (sx != ox) {
/*
* If getting smaller, nuke any data in lines over the new
* size.
*/
if (sx < ox) {
for (i = s->hsize; i < s->hsize + oy; i++) {
if (s->grid_size[i] > sx)
screen_reduce_line(s, i, sx);
}
}
if (s->cx >= sx)
s->cx = sx - 1;
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s->dx = sx;
}
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/*
* Y dimension.
*/
if (sy == oy)
return;
/* Size decreasing. */
if (sy < oy) {
ny = oy - sy;
if (s->cy != 0) {
/*
* The cursor is not at the start. Try to remove as
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* many lines as possible from the top. (Up to the
* cursor line.)
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*/
my = s->cy;
if (my > ny)
my = ny;
screen_free_lines(s, s->hsize, my);
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screen_move_lines(s, s->hsize, s->hsize + my, oy - my);
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s->cy -= my;
oy -= my;
}
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ny = oy - sy;
if (ny > 0) {
/*
* Remove any remaining lines from the bottom.
*/
screen_free_lines(s, s->hsize + oy - ny, ny);
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if (s->cy >= sy)
s->cy = sy - 1;
}
}
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/* Resize line arrays. */
ny = s->hsize + sy;
s->grid_data = xrealloc(s->grid_data, ny, sizeof *s->grid_data);
s->grid_attr = xrealloc(s->grid_attr, ny, sizeof *s->grid_attr);
s->grid_colr = xrealloc(s->grid_colr, ny, sizeof *s->grid_colr);
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s->grid_size = xrealloc(s->grid_size, ny, sizeof *s->grid_size);
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s->dy = sy;
/* Size increasing. */
if (sy > oy)
screen_make_lines(s, s->hsize + oy, sy - oy);
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s->rupper = 0;
s->rlower = s->dy - 1;
}
/* Expand line. */
void
screen_expand_line(struct screen *s, u_int py, u_int nx)
{
u_int ox;
ox = s->grid_size[py];
s->grid_size[py] = nx;
s->grid_data[py] = xrealloc(s->grid_data[py], 1, nx);
memset(&s->grid_data[py][ox], SCREEN_DEFDATA, nx - ox);
s->grid_attr[py] = xrealloc(s->grid_attr[py], 1, nx);
memset(&s->grid_attr[py][ox], SCREEN_DEFATTR, nx - ox);
s->grid_colr[py] = xrealloc(s->grid_colr[py], 1, nx);
memset(&s->grid_colr[py][ox], SCREEN_DEFCOLR, nx - ox);
}
/* Reduce line. */
void
screen_reduce_line(struct screen *s, u_int py, u_int nx)
{
s->grid_size[py] = nx;
s->grid_data[py] = xrealloc(s->grid_data[py], 1, nx);
s->grid_attr[py] = xrealloc(s->grid_attr[py], 1, nx);
s->grid_colr[py] = xrealloc(s->grid_colr[py], 1, nx);
}
/* Get cell. */
void
screen_get_cell(struct screen *s,
u_int cx, u_int cy, u_char *data, u_char *attr, u_char *colr)
{
if (cx >= s->grid_size[cy]) {
*data = SCREEN_DEFDATA;
*attr = SCREEN_DEFATTR;
*colr = SCREEN_DEFCOLR;
} else {
*data = s->grid_data[cy][cx];
*attr = s->grid_attr[cy][cx];
*colr = s->grid_colr[cy][cx];
}
if (screen_check_selection(s, cx, cy))
*attr |= ATTR_REVERSE;
}
/* Set a cell. */
void
screen_set_cell(struct screen *s,
u_int cx, u_int cy, u_char data, u_char attr, u_char colr)
{
if (cx >= s->grid_size[cy]) {
if (data == SCREEN_DEFDATA &&
attr == SCREEN_DEFATTR && colr == SCREEN_DEFCOLR)
return;
screen_expand_line(s, cy, cx + 1);
}
s->grid_data[cy][cx] = data;
s->grid_attr[cy][cx] = attr;
s->grid_colr[cy][cx] = colr;
}
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/* Destroy a screen. */
void
screen_destroy(struct screen *s)
{
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xfree(s->title);
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screen_free_lines(s, 0, s->dy + s->hsize);
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xfree(s->grid_data);
xfree(s->grid_attr);
xfree(s->grid_colr);
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xfree(s->grid_size);
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}
/* Create a range of lines. */
void
screen_make_lines(struct screen *s, u_int py, u_int ny)
{
u_int i;
for (i = py; i < py + ny; i++) {
s->grid_data[i] = NULL;
s->grid_attr[i] = NULL;
s->grid_colr[i] = NULL;
s->grid_size[i] = 0;
}
}
/* Free a range of ny lines at py. */
void
screen_free_lines(struct screen *s, u_int py, u_int ny)
{
u_int i;
for (i = py; i < py + ny; i++) {
if (s->grid_data[i] != NULL)
xfree(s->grid_data[i]);
s->grid_data[i] = NULL;
if (s->grid_attr[i] != NULL)
xfree(s->grid_attr[i]);
s->grid_attr[i] = NULL;
if (s->grid_colr[i] != NULL)
xfree(s->grid_colr[i]);
s->grid_colr[i] = NULL;
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s->grid_size[i] = 0;
}
}
/* Move a range of lines. */
void
screen_move_lines(struct screen *s, u_int dy, u_int py, u_int ny)
{
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));
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memmove(
&s->grid_size[dy], &s->grid_size[py], ny * (sizeof *s->grid_size));
}
/* Fill an area. */
void
screen_fill_area(struct screen *s, u_int px, u_int py,
u_int nx, u_int ny, u_char data, u_char attr, u_char colr)
{
u_int i, j;
for (i = py; i < py + ny; i++) {
for (j = px; j < px + nx; j++)
screen_set_cell(s, j, i, data, attr, colr);
}
}
/* Set selection. */
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void
screen_set_selection(struct screen *s, u_int sx, u_int sy, u_int ex, u_int ey)
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{
struct screen_sel *sel = &s->sel;
sel->flag = 1;
if (ey < sy || (sy == ey && ex < sx)) {
sel->sx = ex; sel->sy = ey;
sel->ex = sx; sel->ey = sy;
} else {
sel->sx = sx; sel->sy = sy;
sel->ex = ex; sel->ey = ey;
}
}
/* Clear selection. */
void
screen_clear_selection(struct screen *s)
{
struct screen_sel *sel = &s->sel;
sel->flag = 0;
}
/* Check if cell in selection. */
int
screen_check_selection(struct screen *s, u_int px, u_int py)
{
struct screen_sel *sel = &s->sel;
if (!sel->flag || py < sel->sy || py > sel->ey)
return (0);
if (py == sel->sy && py == sel->ey) {
if (px < sel->sx || px > sel->ex)
return (0);
return (1);
}
if ((py == sel->sy && px < sel->sx) || (py == sel->ey && px > sel->ex))
return (0);
return (1);
}