[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);
}

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 first_write_to_front)
{
	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;
		if (first_write_to_front)
			fbdev->buffer_write = 0;

		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");
		}

		// omap is still using the old mode until vsync,
		// if the caller starts to write now we may get garbage on screen
		vout_fbdev_wait_vsync(fbdev);
	}

	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, 0);
	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	void vout_fbdev_resize(struct vout_fbdev fbdev, int w, int h, int bpp,
33787db4	70	int left_border, int right_border, int top_border, int bottom_border,
33787db4	71	int buffer_cnt, int first_write_to_front)
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;
33787db4	103	if (first_write_to_front)
33787db4	104	fbdev->buffer_write = 0;
87a68cdb	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
33787db4	121	// omap is still using the old mode until vsync,
	122	// if the caller starts to write now we may get garbage on screen
	123	vout_fbdev_wait_vsync(fbdev);
b6b7d1b1	124	}
b6b7d1b1	125
4332e4bc	126	fbdev->fb_size = w_total * h_total * bpp / 8;
b6b7d1b1	127	fbdev->top_border = top_border;
	128	fbdev->bottom_border = bottom_border;
	129
	130	mem_size = fbdev->fb_size * fbdev->buffer_count;
	131	if (fbdev->mem_size >= mem_size)
87a68cdb	132	goto out;
b6b7d1b1	133
	134	if (fbdev->mem != NULL)
	135	munmap(fbdev->mem, fbdev->mem_size);
	136
	137	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	138	if (fbdev->mem == MAP_FAILED && fbdev->buffer_count > 1) {
323db729	139	fprintf(stderr, PFX "Warning: can't map %zd bytes, doublebuffering disabled\n", mem_size);
b6b7d1b1	140	fbdev->buffer_count = 1;
9c2179d3	141	fbdev->buffer_write = 0;
b6b7d1b1	142	mem_size = fbdev->fb_size;
	143	fbdev->mem = mmap(0, mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	144	}
	145	if (fbdev->mem == MAP_FAILED) {
	146	fbdev->mem = NULL;
	147	fbdev->mem_size = 0;
323db729	148	perror(PFX "mmap framebuffer");
87a68cdb	149	return NULL;
b6b7d1b1	150	}
	151
	152	fbdev->mem_size = mem_size;
87a68cdb	153
	154	out:
	155	return (char )fbdev->mem + fbdev->fb_size fbdev->buffer_write;
b6b7d1b1	156	}
b6b7d1b1	157
1f8b4b84	158	void vout_fbdev_clear(struct vout_fbdev *fbdev)
b188c2b6	159	{
fdfcdca9	160	if (fbdev->mem)
fdfcdca9	161	memset(fbdev->mem, 0, fbdev->fb_size * fbdev->buffer_count);
1f8b4b84	162	}
1f8b4b84	163
b6b7d1b1	164	void vout_fbdev_clear_lines(struct vout_fbdev *fbdev, int y, int count)
b6b7d1b1	165	{
6bc3d94d	166	int stride = fbdev->fbvar_new.xres_virtual * fbdev->fbvar_new.bits_per_pixel / 8;
b6b7d1b1	167	int i;
b6b7d1b1	168
6bc3d94d	169	if (y + count > fbdev->top_border + fbdev->fbvar_new.yres)
6bc3d94d	170	count = fbdev->top_border + fbdev->fbvar_new.yres - y;
b6b7d1b1	171
	172	if (y >= 0 && count > 0)
	173	for (i = 0; i < fbdev->buffer_count; i++)
	174	memset((char )fbdev->mem + fbdev->fb_size i + y * stride, 0, stride * count);
	175	}
	176
	177	int vout_fbdev_get_fd(struct vout_fbdev *fbdev)
	178	{
	179	return fbdev->fd;
	180	}
	181
4332e4bc	182	struct vout_fbdev vout_fbdev_init(const char fbdev_name, int w, int h, int bpp, int buffer_cnt)
1f8b4b84	183	{
1f8b4b84	184	struct vout_fbdev *fbdev;
b6b7d1b1	185	int req_w, req_h;
87a68cdb	186	void *pret;
b6b7d1b1	187	int ret;
b188c2b6	188
1f8b4b84	189	fbdev = calloc(1, sizeof(*fbdev));
	190	if (fbdev == NULL)
	191	return NULL;
	192
	193	fbdev->fd = open(fbdev_name, O_RDWR);
	194	if (fbdev->fd == -1) {
323db729	195	fprintf(stderr, PFX "%s: ", fbdev_name);
b188c2b6	196	perror("open");
1f8b4b84	197	goto fail_open;
b188c2b6	198	}
b188c2b6	199
1f8b4b84	200	ret = ioctl(fbdev->fd, FBIOGET_VSCREENINFO, &fbdev->fbvar_old);
b188c2b6	201	if (ret == -1) {
323db729	202	perror(PFX "FBIOGET_VSCREENINFO ioctl");
b188c2b6	203	goto fail;
	204	}
	205
1f8b4b84	206	fbdev->fbvar_new = fbdev->fbvar_old;
b188c2b6	207
b6b7d1b1	208	req_w = fbdev->fbvar_new.xres;
	209	if (*w != 0)
	210	req_w = *w;
	211	req_h = fbdev->fbvar_new.yres;
	212	if (*h != 0)
	213	req_h = *h;
b188c2b6	214
33787db4	215	pret = vout_fbdev_resize(fbdev, req_w, req_h, bpp, 0, 0, 0, 0, buffer_cnt, 0);
87a68cdb	216	if (pret == NULL)
b188c2b6	217	goto fail;
b6b7d1b1	218
323db729	219	printf(PFX "%s: %ix%i@%d\n", fbdev_name, fbdev->fbvar_new.xres,
323db729	220	fbdev->fbvar_new.yres, fbdev->fbvar_new.bits_per_pixel);
b6b7d1b1	221	*w = fbdev->fbvar_new.xres;
	222	*h = fbdev->fbvar_new.yres;
	223
1f8b4b84	224	memset(fbdev->mem, 0, fbdev->mem_size);
b188c2b6	225
	226	// some checks
	227	ret = 0;
1f8b4b84	228	ret = ioctl(fbdev->fd, FBIO_WAITFORVSYNC, &ret);
b188c2b6	229	if (ret != 0)
323db729	230	fprintf(stderr, PFX "Warning: vsync doesn't seem to be supported\n");
b188c2b6	231
1f8b4b84	232	if (fbdev->buffer_count > 1) {
1f8b4b84	233	fbdev->buffer_write = 0;
b6b7d1b1	234	fbdev->fbvar_new.yoffset = fbdev->fbvar_new.yres * (fbdev->buffer_count - 1);
1f8b4b84	235	ret = ioctl(fbdev->fd, FBIOPAN_DISPLAY, &fbdev->fbvar_new);
b188c2b6	236	if (ret != 0) {
1f8b4b84	237	fbdev->buffer_count = 1;
323db729	238	fprintf(stderr, PFX "Warning: can't pan display, doublebuffering disabled\n");
b188c2b6	239	}
	240	}
	241
	242	printf("fbdev initialized.\n");
1f8b4b84	243	return fbdev;
b188c2b6	244
b188c2b6	245	fail:
1f8b4b84	246	close(fbdev->fd);
	247	fail_open:
	248	free(fbdev);
	249	return NULL;
b188c2b6	250	}
b188c2b6	251
323db729	252	static void vout_fbdev_release(struct vout_fbdev *fbdev)
b188c2b6	253	{
1f8b4b84	254	ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_old);
	255	if (fbdev->mem != MAP_FAILED)
	256	munmap(fbdev->mem, fbdev->mem_size);
323db729	257	fbdev->mem = NULL;
	258	}
	259
	260	int vout_fbdev_save(struct vout_fbdev *fbdev)
	261	{
	262	void *tmp;
	263
	264	if (fbdev == NULL \|\| fbdev->mem == NULL \|\| fbdev->mem == MAP_FAILED) {
	265	fprintf(stderr, PFX "bad args for save\n");
	266	return -1;
	267	}
	268
	269	if (fbdev->mem_saved_size < fbdev->mem_size) {
	270	tmp = realloc(fbdev->mem_saved, fbdev->mem_size);
	271	if (tmp == NULL)
	272	return -1;
	273	fbdev->mem_saved = tmp;
	274	}
	275	memcpy(fbdev->mem_saved, fbdev->mem, fbdev->mem_size);
	276	fbdev->mem_saved_size = fbdev->mem_size;
	277
	278	vout_fbdev_release(fbdev);
	279	return 0;
	280	}
	281
	282	int vout_fbdev_restore(struct vout_fbdev *fbdev)
	283	{
	284	int ret;
	285
	286	if (fbdev == NULL \|\| fbdev->mem != NULL) {
	287	fprintf(stderr, PFX "bad args/state for restore\n");
	288	return -1;
	289	}
	290
	291	fbdev->mem = mmap(0, fbdev->mem_size, PROT_WRITE\|PROT_READ, MAP_SHARED, fbdev->fd, 0);
	292	if (fbdev->mem == MAP_FAILED) {
	293	perror(PFX "restore: memory restore failed");
	294	return -1;
	295	}
	296	memcpy(fbdev->mem, fbdev->mem_saved, fbdev->mem_size);
	297
	298	ret = ioctl(fbdev->fd, FBIOPUT_VSCREENINFO, &fbdev->fbvar_new);
	299	if (ret == -1) {
	300	perror(PFX "restore: FBIOPUT_VSCREENINFO");
	301	return -1;
	302	}
	303
	304	return 0;
	305	}
	306
	307	void vout_fbdev_finish(struct vout_fbdev *fbdev)
	308	{
	309	vout_fbdev_release(fbdev);
1f8b4b84	310	if (fbdev->fd >= 0)
1f8b4b84	311	close(fbdev->fd);
1f8b4b84	312	fbdev->fd = -1;
1f8b4b84	313	free(fbdev);
b188c2b6	314	}
b188c2b6	315