tmux/image.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 "tmux.h"

static struct images	all_images = TAILQ_HEAD_INITIALIZER(all_images);
static u_int		all_images_count;

static void
image_free(struct image *im)
{
	struct screen	*s = im->s;

	TAILQ_REMOVE(&all_images, im, all_entry);
	all_images_count--;

	TAILQ_REMOVE(&s->images, im, entry);
	free(im);
}

int
image_free_all(struct screen *s)
{
	struct image	*im, *im1;
	int		 redraw = !TAILQ_EMPTY(&s->images);

	TAILQ_FOREACH_SAFE(im, &s->images, entry, im1)
		image_free(im);
	return (redraw);
}

void
image_store(struct screen *s, struct sixel_image *si)
{
	struct image	*im;

	im = xcalloc(1, sizeof *im);
	im->s = s;
	im->data = si;

	im->px = s->cx;
	im->py = s->cy;
	sixel_size_in_cells(si, &im->sx, &im->sy);

	TAILQ_INSERT_TAIL(&s->images, im, entry);

	TAILQ_INSERT_TAIL(&all_images, im, all_entry);
	if (++all_images_count == 10/*XXX*/)
		image_free(TAILQ_FIRST(&all_images));
}

int
image_check_line(struct screen *s, u_int py, u_int ny)
{
	struct image	*im, *im1;
	int		 redraw = 0;

	TAILQ_FOREACH_SAFE(im, &s->images, entry, im1) {
		if (py + ny > im->py && py < im->py + im->sy) {
			image_free(im);
			redraw = 1;
		}
	}
	return (redraw);
}

int
image_check_area(struct screen *s, u_int px, u_int py, u_int nx, u_int ny)
{
	struct image	*im, *im1;
	int		 redraw = 0;

	TAILQ_FOREACH_SAFE(im, &s->images, entry, im1) {
		if (py + ny <= im->py || py >= im->py + im->sy)
			continue;
		if (px + nx <= im->px || px >= im->px + im->sx)
			continue;
		image_free(im);
		redraw = 1;
	}
	return (redraw);
}

int
image_scroll_up(struct screen *s, u_int lines)
{
	struct image		*im, *im1;
	int			 redraw = 0;
	u_int			 sx, sy;
	struct sixel_image	*new;

	TAILQ_FOREACH_SAFE(im, &s->images, entry, im1) {
		if (im->py >= lines) {
			im->py -= lines;
			redraw = 1;
			continue;
		}
		if (im->py + im->sy <= lines) {
			image_free(im);
			redraw = 1;
			continue;
		}
		sx = im->sx;
		sy = (im->py + im->sy) - lines;

		new = sixel_scale(im->data, 0, 0, 0, im->sy - sy, sx, sy, 1);
		sixel_free(im->data);
		im->data = new;

		im->py = 0;
		sixel_size_in_cells(im->data, &im->sx, &im->sy);
		redraw = 1;
	}
	return (redraw);
}