path: root/grid.c

/* $Id$ */

/*
 * 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 <stdlib.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, ' ' };
const struct grid_cell grid_marker_cell = { 0, 0, 8, 8, '_' };

#define grid_put_cell(gd, px, py, gc) do {			\
	memcpy(&gd->linedata[py].celldata[px], 			\
	    gc, sizeof gd->linedata[py].celldata[px]);		\
} while (0)
#define grid_put_utf8(gd, px, py, gc) do {			\
	memcpy(&gd->linedata[py].utf8data[px], 			\
	    gc, sizeof gd->linedata[py].utf8data[px]);		\
} while (0)

int	grid_check_y(struct grid *, u_int);

#ifdef DEBUG
int
grid_check_y(struct grid *gd, u_int py)
{
	if ((py) >= (gd)->hsize + (gd)->sy)
		log_fatalx("y out of range: %u", py);
	return (0);
}
#else
int
grid_check_y(struct grid *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 *
grid_create(u_int sx, u_int sy, u_int hlimit)
{
	struct grid	*gd;

	gd = xmalloc(sizeof *gd);
	gd->sx = sx;
	gd->sy = sy;

	gd->flags = GRID_HISTORY;

	gd->hsize = 0;
	gd->hlimit = hlimit;

	gd->linedata = xcalloc(gd->sy, sizeof *gd->linedata);

	return (gd);
}

/* Destroy grid. */
void
grid_destroy(struct grid *gd)
{
	struct grid_line	*gl;
	u_int			 yy;

	for (yy = 0; yy < gd->hsize + gd->sy; yy++) {
		gl = &gd->linedata[yy];
		free(gl->celldata);
		free(gl->utf8data);
	}

	free(gd->linedata);

	free(gd);
}

/* Compare grids. */
int
grid_compare(struct grid *ga, struct grid *gb)
{
	struct grid_line	*gla, *glb;
	struct grid_cell	*gca, *gcb;
	struct grid_utf8	*gua, *gub;
	u_int			 xx, yy;

	if (ga->sx != gb->sx || ga->sy != ga->sy)
		return (1);

	for (yy = 0; yy < ga->sy; yy++) {
		gla = &ga->linedata[yy];
		glb = &gb->linedata[yy];
		if (gla->cellsize != glb->cellsize)
			return (1);
		for (xx = 0; xx < ga->sx; xx++) {
			gca = &gla->celldata[xx];
			gcb = &glb->celldata[xx];
			if (memcmp(gca, gcb, sizeof (struct grid_cell)) != 0)
				return (1);
			if (!(gca->flags & GRID_FLAG_UTF8))
				continue;
			gua = &gla->utf8data[xx];
			gub = &glb->utf8data[xx];
			if (memcmp(gua, gub, sizeof (struct grid_utf8)) != 0)
				return (1);
		}
	}

	return (0);
}

/*
 * Collect lines from the history if at the limit. Free the top (oldest) 10%
 * and shift up.
 */
void
grid_collect_history(struct grid *gd)
{
	u_int	yy;

	GRID_DEBUG(gd, "");

	if (gd->hsize < gd->hlimit)
		return;

	yy = gd->hlimit / 10;
	if (yy < 1)
		yy = 1;

	grid_move_lines(gd, 0, yy, gd->hsize + gd->sy - yy);
	gd->hsize -= yy;
}

/*
 * Scroll the entire visible screen, moving one line into the history. Just
 * allocate a new line at the bottom and move the history size indicator.
 */
void
grid_scroll_history(struct grid *gd)
{
	u_int	yy;

	GRID_DEBUG(gd, "");

	yy = gd->hsize + gd->sy;
	gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);
	memset(&gd->linedata[yy], 0, sizeof gd->linedata[yy]);

	gd->hsize++;
}

/* Scroll a region up, moving the top line into the history. */
void
grid_scroll_history_region(struct grid *gd, u_int upper, u_int lower)
{
	struct grid_line	*gl_history, *gl_upper, *gl_lower;
	u_int			 yy;

	GRID_DEBUG(gd, "upper=%u, lower=%u", upper, lower);

	/* Create a space for a new line. */
	yy = gd->hsize + gd->sy;
	gd->linedata = xrealloc(gd->linedata, yy + 1, sizeof *gd->linedata);

	/* Move the entire screen down to free a space for this line. */
	gl_history = &gd->linedata[gd->hsize];
	memmove(gl_history + 1, gl_history, gd->sy * sizeof *gl_history);

	/* Adjust the region and find its start and end. */
	upper++;
	gl_upper = &gd->linedata[upper];
	lower++;
	gl_lower = &gd->linedata[lower];

	/* Move the line into the history. */
	memcpy(gl_history, gl_upper, sizeof *gl_history);

	/* Then move the region up and clear the bottom line. */
	memmove(gl_upper, gl_upper + 1, (lower - upper) * sizeof *gl_upper);
	memset(gl_lower, 0, sizeof *gl_lower);

	/* Move the history offset down over the line. */
	gd->hsize++;
}

/* Expand line to fit to cell. */
void
grid_expand_line(struct grid *gd, u_int py, u_int sx)
{
	struct grid_line	*gl;
	u_int			 xx;

	gl = &gd->linedata[py];
	if (sx <= gl->cellsize)
		return;

	gl->celldata = xrealloc(gl->celldata, sx, sizeof *gl->celldata);
	for (xx = gl->cellsize; xx < sx; xx++)
		grid_put_cell(gd, xx, py, &grid_default_cell);
	gl->cellsize = sx;
}

/* Expand line to fit to cell for UTF-8. */
void
grid_expand_line_utf8(struct grid *gd, u_int py, u_int sx)
{
	struct grid_line	*gl;

	gl = &gd->linedata[py];
	if (sx <= gl->utf8size)
		return;

	gl->utf8data = xrealloc(gl