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/* $Id: grid.c,v 1.9 2009-02-16 18:51:39 nicm Exp $ */
/*
* Copyright (c) 2008 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"
/*
* Grid data. This is the basic data structure that represents what is shown on
* screen.
*
* A grid is a grid of cells (struct grid_cell). Lines are not allocated until
* cells in that line are written to. The grid is split into history and
* viewable data with the history starting at row (line) 0 and extending to
* (hsize - 1); from hsize to hsize + (sy - 1) is the viewable data. All
* functions in this file work on absolute coordinates, grid-view.c has
* functions which work on the screen data.
*/
/* Default grid cell data. */
const struct grid_cell grid_default_cell = { ' ', 0, 0, 8, 8 };
#define grid_put_cell(gd, px, py, gc) do { \
memcpy(&gd->data[py][px], gc, sizeof gd->data[py][px]); \
} while (0)
int grid_check_x(struct grid_data *, u_int);
int grid_check_y(struct grid_data *, u_int);
#ifdef DEBUG
int
grid_check_x(struct grid_data *gd, u_int px)
{
if ((px) >= (gd)->sx)
log_fatalx("x out of range: %u", px);
return (0);
}
int
grid_check_y(struct grid_data *gd, u_int py)
{
if ((py) >= (gd)->hsize + (gd)->sy)
log_fatalx("y out of range: %u", py);
return (0);
}
#else
int
grid_check_x(struct grid_data *gd, u_int px)
{
if ((px) >= (gd)->sx) {
log_debug("x out of range: %u", px);
return (-1);
}
return (0);
}
int
grid_check_y(struct grid_data *gd, u_int py)
{
if ((py) >= (gd)->hsize + (gd)->sy) {
log_debug("y out of range: %u", py);
return (-1);
}
return (0);
}
#endif
/* Create a new grid. */
struct grid_data *
grid_create(u_int sx, u_int sy, u_int hlimit)
{
struct grid_data *gd;
gd = xmalloc(sizeof *gd);
gd->sx = sx;
gd->sy = sy;
gd->hsize = 0;
gd->hlimit = hlimit;
gd->size = xcalloc(gd->sy, sizeof *gd->size);
gd->data = xcalloc(gd->sy, sizeof *gd->data);
return (gd);
}
/* Destroy grid. */
void
grid_destroy(struct grid_data *gd)
{
u_int yy;
for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
if (gd->data[yy] != NULL)
xfree(gd->data[yy]);
}
if (gd->data != NULL)
xfree(gd->data);
if (gd->size != NULL)
xfree(gd->size);
xfree(gd);
}
/* Compare grids. */
int
grid_compare(struct grid_data *ga, struct grid_data *gb)
{
struct grid_cell *gca, *gcb;
u_int xx, yy;
if (ga->sx != gb->sx || ga->sy != ga->sy)
return (1);
for (yy = 0; yy < ga->sy; yy++) {
if (ga->size[yy] != gb->size[yy])
return (1);
for (xx = 0; xx < ga->sx; xx++) {
gca = &ga->data[yy][xx];
gcb = &gb->data[yy][xx];
if (memcmp(gca, gcb, sizeof (struct grid_cell)) != 0)
return (1);
}
}
return (0);
}
/* Scroll a line into the history. */
void
grid_scroll_line(struct grid_data *gd)
{
u_int yy;
GRID_DEBUG(gd, "");
if (gd->hsize >= gd->hlimit - 1) {
/* If the limit is hit, free the bottom 10% and shift up. */
yy = gd->hlimit / 10;
if (yy < 1)
yy = 1;
grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
gd->hsize -= yy;
}
yy = gd->hsize + gd->sy;
gd->size = xrealloc(gd->size, yy + 1, sizeof *gd->size);
gd->data = xrealloc(gd->data, yy + 1, sizeof *gd->data);
gd->data[yy] = NULL;
gd->size[yy] = 0;
gd->hsize++;
}
/* Reduce line to fit to cell. */
void
grid_reduce_line(struct grid_data *gd, u_int py, u_int sx)
{
if (sx >= gd->size[py])
return;
gd->data[py] = xrealloc(gd->data[py], sx, sizeof **gd->data);
gd->size[py] = sx;
}
/* Expand line to fit to cell. */
void
grid_expand_line(struct grid_data *gd, u_int py, u_int sx)
{
u_int xx;
if (sx <= gd->size[py])
return;
gd->data[py] = xrealloc(gd->data[py], sx, sizeof **gd->data);
for (xx = gd->size[py]; xx < sx; xx++)
grid_put_cell(gd, xx, py, &grid_default_cell);
gd->size[py] = sx;
}
/* Get cell for reading. */
const struct grid_cell *
grid_peek_cell(struct grid_data *gd, u_int px, u_int py)
{
if (grid_check_x(gd, px) != 0)
return (&grid_default_cell);
if (grid_check_y(gd, py) != 0)
return (&grid_default_cell);
if (px >= gd->size[py])
return (&grid_default_cell);
return (&gd->data[py][px]);
}
/* Get cell at relative position (for writing). */
struct grid_cell *
grid_get_cell(struct grid_data *gd, u_int px, u_int py)
{
if (grid_check_x(gd, px) != 0)
return (NULL);
if (grid_check_y(gd, py) != 0)
return (NULL);
grid_expand_line(gd, py, px + 1);
return (&gd->data[py][px]);
}
/* Set cell at relative position. */
void
grid_set_cell(
struct grid_data *gd, u_int px, u_int py, const struct grid_cell *gc)
{
if (grid_check_x(gd, px) != 0)
return;
if (grid_check_y(gd, py) != 0)
return;
grid_expand_line(gd, py, px + 1);
grid_put_cell(gd, px, py, gc);
}
/*
* Clear area. Note this is different from a fill as it just omits unallocated
* cells.
*/
void
grid_clear(struct grid_data *gd, u_int px, u_int py, u_int nx, u_int ny)
{
u_int xx, yy;
GRID_DEBUG(gd, "px=%u, py=%u, nx=%u, ny=%u", px, py, nx, ny);
if (nx
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