path: root/screen-write.c

/* $OpenBSD$ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * 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"

static void	screen_write_initctx(struct screen_write_ctx *,
		    struct tty_ctx *);
static void	screen_write_save_last(struct screen_write_ctx *,
		    struct tty_ctx *);
static void	screen_write_flush(struct screen_write_ctx *);

static int	screen_write_overwrite(struct screen_write_ctx *,
		    struct grid_cell *, u_int);
static int	screen_write_combine(struct screen_write_ctx *,
		    const struct utf8_data *);

static const struct grid_cell screen_write_pad_cell = {
	GRID_FLAG_PADDING, 0, 8, 8, { { 0 }, 0, 0, 0 }
};

#define screen_dirty_bit(s, x, y) (((y) * screen_size_x(s)) + (x))
#define screen_dirty_clear(s, sx, sy, ex, ey)			\
	do {							\
		if (s->dirty != NULL) {				\
			bit_nclear(s->dirty,			\
			    screen_dirty_bit(s, sx, sy),	\
			    screen_dirty_bit(s, ex, ey));	\
		}						\
	} while (0)

/* Initialize writing with a window. */
void
screen_write_start(struct screen_write_ctx *ctx, struct window_pane *wp,
    struct screen *s)
{
	u_int		 size;
	char		 tmp[16];
	const char	*cp = tmp;

	ctx->wp = wp;
	if (wp != NULL && s == NULL)
		ctx->s = wp->screen;
	else
		ctx->s = s;

	size = screen_size_x(ctx->s) * screen_size_y(ctx->s);
	if (ctx->s->dirtysize != size) {
		free(ctx->s->dirty);
		ctx->s->dirty = NULL;
		ctx->s->dirtysize = size;
	}
	ctx->dirty = 0;

	ctx->cells = ctx->written = ctx->skipped = 0;

	if (wp == NULL)
		cp = "no pane";
	else
		snprintf(tmp, sizeof tmp, "pane %%%u", wp->id);
	log_debug("%s: size %ux%u, %s", __func__, screen_size_x(ctx->s),
	    screen_size_y(ctx->s), cp);
}

/* Finish writing. */
void
screen_write_stop(struct screen_write_ctx *ctx)
{
	screen_write_flush(ctx);

	log_debug("%s: %u of %u written (dirty %u, skipped %u)", __func__,
	    ctx->written, ctx->cells, ctx->cells - ctx->written, ctx->skipped);
}

/* Flush outstanding cell writes. */
static void
screen_write_flush(struct screen_write_ctx *ctx)
{
	struct screen	*s = ctx->s;
	struct tty_ctx	 ttyctx;
	u_int		 x, y, offset, cx, cy, dirty;
	struct grid_cell gc;

	if (ctx->dirty == 0)
		return;
	dirty = 0;

	cx = s->cx;
	cy = s->cy;

	offset = 0;
	for (y = 0; y < screen_size_y(s); y++) {
		for (x = 0; x < screen_size_x(s); x++) {
			offset++;
			if (!bit_test(s->dirty, offset - 1))
				continue;
			bit_clear(s->dirty, offset - 1);

			screen_write_cursormove(ctx, x, y);
			grid_view_get_cell(s->grid, x, y, &gc);

			screen_write_initctx(ctx, &ttyctx);
			ttyctx.cell = &gc;
			tty_write(tty_cmd_cell, &ttyctx);
			ctx->written++;

			if (++dirty == ctx->dirty)
				break;
		}
		if (dirty == ctx->dirty)
			break;
	}

	s->cx = cx;
	s->cy = cy;
}

/* Reset screen state. */
void
screen_write_reset(struct screen_write_ctx *ctx)
{
	struct screen	*s = ctx->s;

	screen_reset_tabs(s);
	screen_write_scrollregion(ctx, 0, screen_size_y(s) - 1);

	s->mode &= ~(MODE_INSERT|MODE_KCURSOR|MODE_KKEYPAD|MODE_FOCUSON);
	s->mode &= ~(ALL_MOUSE_MODES|MODE_MOUSE_UTF8|MODE_MOUSE_SGR);

	screen_write_clearscreen(ctx);
	screen_write_cursormove(ctx, 0, 0);
}

/* Write character. */
void
screen_write_putc(struct screen_write_ctx *ctx, const struct grid_cell *gcp,
    u_char ch)
{
	struct grid_cell	gc;

	memcpy(&gc, gcp, sizeof gc);

	utf8_set(&gc.data, ch);
	screen_write_cell(ctx, &gc);
}

/* Calculate string length, with embedded formatting. */
size_t