[libpicofe.git] / linux / fbdev.c

/*
 * (C) Gražvydas "notaz" Ignotas, 2009-2010
 *
 * This work is licensed under the terms of any of these licenses
 * (at your option):
 *  - GNU GPL, version 2 or later.
 *  - GNU LGPL, version 2.1 or later.
 *  - MAME license.
 * See the COPYING file in the top-level directory.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <linux/fb.h>
#include <linux/matroxfb.h>

#include "fbdev.h"

#define PFX "fbdev: "

struct vout_fbdev {
	int	fd;
	void	*mem;
	size_t	mem_size;
	struct	fb_var_screeninfo fbvar_old;
	struct	fb_var_screeninfo fbvar_new;
	int	buffer_write;
	int	fb_size;
	int	buffer_count;
	int	top_border, bottom_border;
	void	*mem_saved;
	size_t	mem_saved_size;
};

void *vout_fbdev_flip(struct vout_fbdev *fbdev)
{
	int draw_buf;

	if (fbdev->buffer_count < 2)
		return fbdev->mem;

	draw_buf = fbdev->buffer_write;
	fbdev->buffer_write++;
	if (fbdev->buffer_write >= fbdev->buffer_count)
		fbdev->buffer_write = 0;

	fbdev->fbvar_new.yoffset = 
		(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
		fbdev->top_border;

	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);

	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}

void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
{
	int arg = 0;
	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
}

/* it is recommended to call vout_fbdev_clear() before this */
void *vout_fbdev_resize(struct vout_fbdev *fbdev, int w, int h, int bpp,
		      int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
{
	int w_total = left_border + w + right_border;
	int h_total = top_border + h + bottom_border;
	size_t mem_size;
	int ret;

	// unblank to be sure the mode is really accepted
	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);

	if (fbdev->fbvar_new.bits_per_pixel != bpp ||
			fbdev->fbvar_new.xres != w ||
			fbdev->fbvar_new.yres != h ||
			fbdev->fbvar_new.xres_virtual != w_total||
			fbdev->fbvar_new.yres_virtual < h_total ||
			fbdev->fbvar_new.xoffset != left_border ||
			fbdev->buffer_count != buffer_cnt)
	{
		if (fbdev->fbvar_new.bits_per_pixel != bpp ||
				w != fbdev->fbvar_new.xres || h != fbdev->fbvar_new.yres)
			printf(PFX "switching to %dx%d@%d\n", w, h, bpp);

		fbdev->fbvar_new.xres = w;
		fbdev->fbvar_new.yres = h;
		fbdev->fbvar_new.xres_virtual = w_total;
		fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
		fbdev->fbvar_new.xoffset = left_border;
		fbdev->fbvar_new.yoffset = top_border;
		fbdev->fbvar_new.bits_per_pixel = bpp;
		fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
		fbdev->buffer_count = buffer_cnt;
		fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;

		// seems to help a bit to avoid glitches
		vout_fbdev_wait_vsync(fbdev);

		ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
		if (ret == -1) {
			// retry with no multibuffering
			fbdev->fbvar_new.yres_virtual = h_total;
			ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
			if (ret == -1) {
				perror(PFX "FBIOPUT_VSCREENINFO ioctl");
				return NULL;
			}
			fbdev->buffer_count = 1;
			fbdev->buffer_write = 0;
			fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
					"multibuffering disabled\n");
		}

	}

	fbdev->fb_size = w_total * h_total * bpp / 8;
	fbdev->top_border = top_border;
	fbdev->bottom_border = bottom_border;

	mem_size = fbdev->fb_size * fbdev->buffer_count;
	if (fbdev->mem_size >= mem_size)
		goto out;

	if (fbdev->mem != NULL)
		munmap(fbdev->mem, fbdev->mem_size);

	fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
		fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
		fbdev->buffer_count = 1;
		fbdev->buffer_write = 0;
		mem_size = fbdev->fb_size;
		fbdev->mem = mmap(0, mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	}
	if (fbdev->mem == MAP_FAILED) {
		fbdev->mem = NULL;
		fbdev->mem_size = 0;
		perror(PFX "mmap framebuffer");
		return NULL;
	}

	fbdev->mem_size = mem_size;

out:
	return (char *)fbdev->mem + fbdev->fb_size * fbdev->buffer_write;
}

void vout_fbdev_clear(struct vout_fbdev *fbdev)
{
	if (fbdev->mem)
		memset(fbdev->mem, 0, fbdev->fb_size * fbdev->buffer_count);
}

void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
{
	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
	int i;

	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
		count = fbdev->top_border + fbdev->fbvar_new.yres - y;

	if (y >= 0 && count > 0)
		for (i = 0; i < fbdev->buffer_count; i++)
			memset((char *)fbdev->mem + fbdev->fb_size * i + y * stride, 0, stride * count);
}

int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
{
	return fbdev->fd;
}

struct vout_fbdev *vout_fbdev_init(const char *fbdev_name, int *w, int *h, int bpp, int buffer_cnt)
{
	struct vout_fbdev *fbdev;
	int req_w, req_h;
	void *pret;
	int ret;

	fbdev = calloc(1, sizeof(*fbdev));
	if (fbdev == NULL)
		return NULL;

	fbdev->fd = open(fbdev_name, O_RDWR);
	if (fbdev->fd == -1) {
		fprintf(stderr, PFX "%s: ", fbdev_name);
		perror("open");
		goto fail_open;
	}

	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
	if (ret == -1) {
		perror(PFX "FBIOGET_VSCREENINFO ioctl");
		goto fail;
	}

	fbdev->fbvar_new = fbdev->fbvar_old;

	req_w = fbdev->fbvar_new.xres;
	if (*w != 0)
		req_w = *w;
	req_h = fbdev->fbvar_new.yres;
	if (*h != 0)
		req_h = *h;

	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
	if (pret == NULL)
		goto fail;

	printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
		fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
	*w = fbdev->fbvar_new.xres;
	*h = fbdev->fbvar_new.yres;

	memset(fbdev->mem, 0, fbdev->mem_size);

	// some checks
	ret = 0;
	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
	if (ret != 0)
		fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");

	if (fbdev->buffer_count > 1) {
		fbdev->buffer_write = 0;
		fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
		ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
		if (ret != 0) {
			fbdev->buffer_count = 1;
			fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
		}
	}

	printf("fbdev initialized.\n");
	return fbdev;

fail:
	close(fbdev->fd);
fail_open:
	free(fbdev);
	return NULL;
}

static void vout_fbdev_release(struct vout_fbdev *fbdev)
{
	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	if (fbdev->mem != MAP_FAILED)
		munmap(fbdev->mem, fbdev->mem_size);
	fbdev->mem = NULL;
}

int vout_fbdev_save(struct vout_fbdev *fbdev)
{
	void *tmp;

	if (fbdev == NULL || fbdev->mem == NULL || fbdev->mem == MAP_FAILED) {
		fprintf(stderr, PFX "bad args for save\n");
		return -1;
	}

	if (fbdev->mem_saved_size < fbdev->mem_size) {
		tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
		if (tmp == NULL)
			return -1;
		fbdev->mem_saved = tmp;
	}
	memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
	fbdev->mem_saved_size = fbdev->mem_size;

	vout_fbdev_release(fbdev);
	return 0;
}

int vout_fbdev_restore(struct vout_fbdev *fbdev)
{
	int ret;

	if (fbdev == NULL || fbdev->mem != NULL) {
		fprintf(stderr, PFX "bad args/state for restore\n");
		return -1;
	}

	fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	if (fbdev->mem == MAP_FAILED) {
		perror(PFX "restore: memory restore failed");
		return -1;
	}
	memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);

	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	if (ret == -1) {
		perror(PFX "restore: FBIOPUT_VSCREENINFO");
		return -1;
	}

	return 0;
}

void vout_fbdev_finish(struct vout_fbdev *fbdev)
{
	vout_fbdev_release(fbdev);
	if (fbdev->fd >= 0)
		close(fbdev->fd);
	fbdev->fd = -1;
	free(fbdev);
}
Commit	Line	Data
392b07b2	1	/*
	2	* (C) Gražvydas "notaz" Ignotas, 2009-2010
	3	*
957a9eac	4	* This work is licensed under the terms of any of these licenses
	5	* (at your option):
	6	* - GNU GPL, version 2 or later.
	7	* - GNU LGPL, version 2.1 or later.
f89d8471	8	* - MAME license.
392b07b2	9	* See the COPYING file in the top-level directory.
	10	*/
	11
b188c2b6	12	#include <stdio.h>
1f8b4b84	13	#include <stdlib.h>
b188c2b6	14	#include <string.h>
	15	#include <sys/types.h>
	16	#include <sys/stat.h>
	17	#include <fcntl.h>
	18	#include <sys/ioctl.h>
	19	#include <sys/mman.h>
	20	#include <unistd.h>
	21	#include <linux/fb.h>
	22	#include <linux/matroxfb.h>
	23
b188c2b6	24	#include "fbdev.h"
b188c2b6	25
323db729	26	#define PFX "fbdev: "
323db729	27
1f8b4b84	28	struct vout_fbdev {
	29	int fd;
	30	void *mem;
	31	size_t mem_size;
	32	struct fb_var_screeninfo fbvar_old;
	33	struct fb_var_screeninfo fbvar_new;
	34	int buffer_write;
b6b7d1b1	35	int fb_size;
1f8b4b84	36	int buffer_count;
b6b7d1b1	37	int top_border, bottom_border;
323db729	38	void *mem_saved;
323db729	39	size_t mem_saved_size;
1f8b4b84	40	};
	41
	42	void vout_fbdev_flip(struct vout_fbdev fbdev)
b188c2b6	43	{
	44	int draw_buf;
	45
1f8b4b84	46	if (fbdev->buffer_count < 2)
1f8b4b84	47	return fbdev->mem;
b188c2b6	48
1f8b4b84	49	draw_buf = fbdev->buffer_write;
	50	fbdev->buffer_write++;
	51	if (fbdev->buffer_write >= fbdev->buffer_count)
	52	fbdev->buffer_write = 0;
b188c2b6	53
b6b7d1b1	54	fbdev->fbvar_new.yoffset =
	55	(fbdev->top_border + fbdev->fbvar_new.yres + fbdev->bottom_border) * draw_buf +
	56	fbdev->top_border;
d5d59eb4	57
1f8b4b84	58	ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
1f8b4b84	59
b6b7d1b1	60	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
b188c2b6	61	}
b188c2b6	62
1f8b4b84	63	void vout_fbdev_wait_vsync(struct vout_fbdev *fbdev)
b188c2b6	64	{
b188c2b6	65	int arg = 0;
1f8b4b84	66	ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &arg);
b188c2b6	67	}
b188c2b6	68
87a68cdb	69	/* it is recommended to call vout_fbdev_clear() before this */
87a68cdb	70	void vout_fbdev_resize(struct vout_fbdev fbdev, int w, int h, int bpp,
4332e4bc	71	int left_border, int right_border, int top_border, int bottom_border, int buffer_cnt)
b6b7d1b1	72	{
	73	int w_total = left_border + w + right_border;
	74	int h_total = top_border + h + bottom_border;
	75	size_t mem_size;
	76	int ret;
	77
	78	// unblank to be sure the mode is really accepted
	79	ioctl(fbdev->fd, FBIOBLANK, FB_BLANK_UNBLANK);
	80
4332e4bc	81	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
9c2179d3	82	fbdev->fbvar_new.xres != w \|\|
	83	fbdev->fbvar_new.yres != h \|\|
	84	fbdev->fbvar_new.xres_virtual != w_total\|\|
	85	fbdev->fbvar_new.yres_virtual < h_total \|\|
	86	fbdev->fbvar_new.xoffset != left_border \|\|
	87	fbdev->buffer_count != buffer_cnt)
	88	{
	89	if (fbdev->fbvar_new.bits_per_pixel != bpp \|\|
	90	w != fbdev->fbvar_new.xres \|\| h != fbdev->fbvar_new.yres)
323db729	91	printf(PFX "switching to %dx%d@%d\n", w, h, bpp);
9c2179d3	92
b6b7d1b1	93	fbdev->fbvar_new.xres = w;
	94	fbdev->fbvar_new.yres = h;
	95	fbdev->fbvar_new.xres_virtual = w_total;
9c2179d3	96	fbdev->fbvar_new.yres_virtual = h_total * buffer_cnt;
b6b7d1b1	97	fbdev->fbvar_new.xoffset = left_border;
87a68cdb	98	fbdev->fbvar_new.yoffset = top_border;
4332e4bc	99	fbdev->fbvar_new.bits_per_pixel = bpp;
f0c1692d	100	fbdev->fbvar_new.nonstd = 0; // can set YUV here on omapfb
9c2179d3	101	fbdev->buffer_count = buffer_cnt;
f168d031	102	fbdev->buffer_write = buffer_cnt > 1 ? 1 : 0;
87a68cdb	103
	104	// seems to help a bit to avoid glitches
	105	vout_fbdev_wait_vsync(fbdev);
	106
b6b7d1b1	107	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
b6b7d1b1	108	if (ret == -1) {
9c2179d3	109	// retry with no multibuffering
	110	fbdev->fbvar_new.yres_virtual = h_total;
	111	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	112	if (ret == -1) {
323db729	113	perror(PFX "FBIOPUT_VSCREENINFO ioctl");
9c2179d3	114	return NULL;
9c2179d3	115	}
b6b7d1b1	116	fbdev->buffer_count = 1;
87a68cdb	117	fbdev->buffer_write = 0;
323db729	118	fprintf(stderr, PFX "Warning: failed to increase virtual resolution, "
9c2179d3	119	"multibuffering disabled\n");
b6b7d1b1	120	}
9c2179d3	121
b6b7d1b1	122	}
b6b7d1b1	123
4332e4bc	124	fbdev->fb_size = w_total * h_total * bpp / 8;
b6b7d1b1	125	fbdev->top_border = top_border;
	126	fbdev->bottom_border = bottom_border;
	127
	128	mem_size = fbdev->fb_size * fbdev->buffer_count;
	129	if (fbdev->mem_size >= mem_size)
87a68cdb	130	goto out;
b6b7d1b1	131
	132	if (fbdev->mem != NULL)
	133	munmap(fbdev->mem, fbdev->mem_size);
	134
	135	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	136	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
323db729	137	fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
b6b7d1b1	138	fbdev->buffer_count = 1;
9c2179d3	139	fbdev->buffer_write = 0;
b6b7d1b1	140	mem_size = fbdev->fb_size;
	141	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	142	}
	143	if (fbdev->mem == MAP_FAILED) {
	144	fbdev->mem = NULL;
	145	fbdev->mem_size = 0;
323db729	146	perror(PFX "mmap framebuffer");
87a68cdb	147	return NULL;
b6b7d1b1	148	}
	149
	150	fbdev->mem_size = mem_size;
87a68cdb	151
	152	out:
	153	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
b6b7d1b1	154	}
b6b7d1b1	155
1f8b4b84	156	void vout_fbdev_clear(struct vout_fbdev *fbdev)
b188c2b6	157	{
fdfcdca9	158	if (fbdev->mem)
fdfcdca9	159	memset(fbdev->mem, 0, fbdev->fb_size * fbdev->buffer_count);
1f8b4b84	160	}
1f8b4b84	161
b6b7d1b1	162	void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
b6b7d1b1	163	{
6bc3d94d	164	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
b6b7d1b1	165	int i;
b6b7d1b1	166
6bc3d94d	167	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
6bc3d94d	168	count = fbdev->top_border + fbdev->fbvar_new.yres - y;
b6b7d1b1	169
	170	if (y >= 0 && count > 0)
	171	for (i = 0; i < fbdev->buffer_count; i++)
	172	memset((char )fbdev->mem + fbdev->fb_size i + y * stride, 0, stride * count);
	173	}
	174
	175	int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
	176	{
	177	return fbdev->fd;
	178	}
	179
4332e4bc	180	struct vout_fbdev vout_fbdev_init(const char fbdev_name, int w, int h, int bpp, int buffer_cnt)
1f8b4b84	181	{
1f8b4b84	182	struct vout_fbdev *fbdev;
b6b7d1b1	183	int req_w, req_h;
87a68cdb	184	void *pret;
b6b7d1b1	185	int ret;
b188c2b6	186
1f8b4b84	187	fbdev = calloc(1, sizeof(*fbdev));
	188	if (fbdev == NULL)
	189	return NULL;
	190
	191	fbdev->fd = open(fbdev_name, O_RDWR);
	192	if (fbdev->fd == -1) {
323db729	193	fprintf(stderr, PFX "%s: ", fbdev_name);
b188c2b6	194	perror("open");
1f8b4b84	195	goto fail_open;
b188c2b6	196	}
b188c2b6	197
1f8b4b84	198	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
b188c2b6	199	if (ret == -1) {
323db729	200	perror(PFX "FBIOGET_VSCREENINFO ioctl");
b188c2b6	201	goto fail;
	202	}
	203
1f8b4b84	204	fbdev->fbvar_new = fbdev->fbvar_old;
b188c2b6	205
b6b7d1b1	206	req_w = fbdev->fbvar_new.xres;
	207	if (*w != 0)
	208	req_w = *w;
	209	req_h = fbdev->fbvar_new.yres;
	210	if (*h != 0)
	211	req_h = *h;
b188c2b6	212
87a68cdb	213	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt);
87a68cdb	214	if (pret == NULL)
b188c2b6	215	goto fail;
b6b7d1b1	216
323db729	217	printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
323db729	218	fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
b6b7d1b1	219	*w = fbdev->fbvar_new.xres;
	220	*h = fbdev->fbvar_new.yres;
	221
1f8b4b84	222	memset(fbdev->mem, 0, fbdev->mem_size);
b188c2b6	223
	224	// some checks
	225	ret = 0;
1f8b4b84	226	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
b188c2b6	227	if (ret != 0)
323db729	228	fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");
b188c2b6	229
1f8b4b84	230	if (fbdev->buffer_count > 1) {
1f8b4b84	231	fbdev->buffer_write = 0;
b6b7d1b1	232	fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
1f8b4b84	233	ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
b188c2b6	234	if (ret != 0) {
1f8b4b84	235	fbdev->buffer_count = 1;
323db729	236	fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
b188c2b6	237	}
	238	}
	239
	240	printf("fbdev initialized.\n");
1f8b4b84	241	return fbdev;
b188c2b6	242
b188c2b6	243	fail:
1f8b4b84	244	close(fbdev->fd);
	245	fail_open:
	246	free(fbdev);
	247	return NULL;
b188c2b6	248	}
b188c2b6	249
323db729	250	static void vout_fbdev_release(struct vout_fbdev *fbdev)
b188c2b6	251	{
1f8b4b84	252	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	253	if (fbdev->mem != MAP_FAILED)
	254	munmap(fbdev->mem, fbdev->mem_size);
323db729	255	fbdev->mem = NULL;
	256	}
	257
	258	int vout_fbdev_save(struct vout_fbdev *fbdev)
	259	{
	260	void *tmp;
	261
	262	if (fbdev == NULL \|\| fbdev->mem == NULL \|\| fbdev->mem == MAP_FAILED) {
	263	fprintf(stderr, PFX "bad args for save\n");
	264	return -1;
	265	}
	266
	267	if (fbdev->mem_saved_size < fbdev->mem_size) {
	268	tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
	269	if (tmp == NULL)
	270	return -1;
	271	fbdev->mem_saved = tmp;
	272	}
	273	memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
	274	fbdev->mem_saved_size = fbdev->mem_size;
	275
	276	vout_fbdev_release(fbdev);
	277	return 0;
	278	}
	279
	280	int vout_fbdev_restore(struct vout_fbdev *fbdev)
	281	{
	282	int ret;
	283
	284	if (fbdev == NULL \|\| fbdev->mem != NULL) {
	285	fprintf(stderr, PFX "bad args/state for restore\n");
	286	return -1;
	287	}
	288
	289	fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	290	if (fbdev->mem == MAP_FAILED) {
	291	perror(PFX "restore: memory restore failed");
	292	return -1;
	293	}
	294	memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);
	295
	296	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	297	if (ret == -1) {
	298	perror(PFX "restore: FBIOPUT_VSCREENINFO");
	299	return -1;
	300	}
	301
	302	return 0;
	303	}
	304
	305	void vout_fbdev_finish(struct vout_fbdev *fbdev)
	306	{
	307	vout_fbdev_release(fbdev);
1f8b4b84	308	if (fbdev->fd >= 0)
1f8b4b84	309	close(fbdev->fd);
1f8b4b84	310	fbdev->fd = -1;
1f8b4b84	311	free(fbdev);
b188c2b6	312	}
b188c2b6	313