[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.
 * 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)
{
	memset(fbdev->mem, 0, fbdev->mem_size);
}

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