int
xcb_image_shm_get (xcb_connection_t * conn,
xcb_drawable_t draw,
xcb_image_t * image,
xcb_shm_segment_info_t shminfo,
int16_t x,
int16_t y,
uint32_t plane_mask)
{
xcb_shm_get_image_reply_t * setup;
xcb_shm_get_image_cookie_t cookie;
xcb_generic_error_t * err = 0;
if (!shminfo.shmaddr)
return 0;
cookie = xcb_shm_get_image(conn, draw,
x, y,
image->width, image->height,
plane_mask,
image->format,
shminfo.shmseg,
image->data - shminfo.shmaddr);
setup = xcb_shm_get_image_reply(conn, cookie, &err);
if (err) {
fprintf(stderr, "ShmGetImageReply error %d\n", (int)err->error_code);
free(err);
return 0;
} else {
free (setup);
return 1;
}
}
cairo_status_t
_cairo_xcb_connection_shm_get_image (cairo_xcb_connection_t *connection,
xcb_drawable_t src,
int16_t src_x,
int16_t src_y,
uint16_t width,
uint16_t height,
uint32_t shmseg,
uint32_t offset)
{
xcb_shm_get_image_reply_t *reply;
xcb_generic_error_t *error;
reply = xcb_shm_get_image_reply (connection->xcb_connection,
xcb_shm_get_image (connection->xcb_connection,
src,
src_x, src_y,
width, height,
(uint32_t) -1,
XCB_IMAGE_FORMAT_Z_PIXMAP,
shmseg, offset),
&error);
free (reply);
if (error) {
/* an error here should be impossible */
free (error);
return _cairo_error (CAIRO_STATUS_READ_ERROR);
}
return _cairo_xcb_connection_take_socket (connection);
}
int krad_x11_capture_getptr (krad_x11_t *x11, uint8_t **buffer) {
int32_t size;
if (buffer == NULL) {
return 0;
}
x11->number = xcb_image_shm_get (x11->connection,
x11->screen->root,
x11->img,
x11->shminfo,
x11->x,
x11->y,
0xffffffff);
x11->reply = xcb_shm_get_image_reply (x11->connection,
x11->cookie,
NULL);
if (x11->reply) {
free (x11->reply);
}
size = x11->img->width * x11->img->height * 4;
*buffer = x11->img->data;
return size;
}
ExcCode screen_shot(int x, int y, int width, int height,
Imlib_Image *res) {
int x1 = x + width;
int y1 = y + height;
x = MAX(x, 0);
y = MAX(y, 0);
x1 = MIN(x1, screen->width_in_pixels);
y1 = MIN(y1, screen->height_in_pixels);
width = x1 - x;
height = y1 - y;
*res = NULL;
if (shm_available) {
xcb_shm_get_image_cookie_t cookie =
xcb_shm_get_image(display,
root, x, y, width, height,
XCB_ALL_PLANES, XCB_IMAGE_FORMAT_Z_PIXMAP,
shmseg, 0);
xcb_shm_get_image_reply_t *reply =
xcb_shm_get_image_reply(display, cookie, NULL);
if (reply != NULL) {
*res = imlib_create_image_using_copied_data(width, height,
(unsigned *) shmaddr);
free(reply);
}
}
if (*res == NULL) {
// If shm can't be used due to lack of the libraries or
// because we connect to X11 on another machine (e.g. via SSH),
// try to get an image via sockets.
xcb_get_image_cookie_t cookie = xcb_get_image(display,
XCB_IMAGE_FORMAT_Z_PIXMAP, root, x, y, width, height,
XCB_ALL_PLANES);
xcb_get_image_reply_t *reply =
xcb_get_image_reply(display, cookie, NULL);
if (reply == NULL)
PANIC(ERR_X_REQUEST, "screen_shot (xcb_get_image_reply)");
*res = imlib_create_image_using_copied_data(width, height,
(unsigned *) xcb_get_image_data(reply));
free(reply);
}
if (*res == NULL)
PANIC(ERR_IMAGE);
if (cursor_capturing_enabled && cursor_available)
screen_cursor_blend(x, y, *res);
return 0;
}
ExcCode screen_shot(int x, int y, int width, int height,
Imlib_Image *res) {
int x1 = x + width;
int y1 = y + height;
x = MAX(x, 0);
y = MAX(y, 0);
x1 = MIN(x1, screen->width_in_pixels);
y1 = MIN(y1, screen->height_in_pixels);
width = x1 - x;
height = y1 - y;
if (shm_available) {
xcb_shm_get_image_cookie_t cookie =
xcb_shm_get_image(display,
root, x, y, width, height,
XCB_ALL_PLANES, XCB_IMAGE_FORMAT_Z_PIXMAP,
shmseg, 0);
xcb_shm_get_image_reply_t *reply =
xcb_shm_get_image_reply(display, cookie, NULL);
if (reply == NULL)
PANIC(ERR_X_REQUEST, "screen_shot (xcb_shm_get_image_reply)");
*res = imlib_create_image_using_copied_data(width, height,
(unsigned *) shmaddr);
free(reply);
} else {
xcb_get_image_cookie_t cookie = xcb_get_image(display,
XCB_IMAGE_FORMAT_Z_PIXMAP, root, x, y, width, height,
XCB_ALL_PLANES);
xcb_get_image_reply_t *reply =
xcb_get_image_reply(display, cookie, NULL);
if (reply == NULL)
PANIC(ERR_X_REQUEST, "screen_shot (xcb_get_image_reply)");
*res = imlib_create_image_using_copied_data(width, height,
(unsigned *) xcb_get_image_data(reply));
free(reply);
}
if (*res == NULL)
PANIC(ERR_IMAGE);
if (cursor_capturing_enabled && cursor_available)
screen_cursor_blend(x, y, *res);
return 0;
}
/**
* Prepare the capture data
*/
static void xshm_video_tick(void *vptr, float seconds)
{
UNUSED_PARAMETER(seconds);
XSHM_DATA(vptr);
if (!data->texture)
return;
if (!obs_source_showing(data->source))
return;
xcb_shm_get_image_cookie_t img_c;
xcb_shm_get_image_reply_t *img_r;
xcb_xfixes_get_cursor_image_cookie_t cur_c;
xcb_xfixes_get_cursor_image_reply_t *cur_r;
img_c = xcb_shm_get_image_unchecked(data->xcb, data->xcb_screen->root,
data->x_org, data->y_org, data->width, data->height,
~0, XCB_IMAGE_FORMAT_Z_PIXMAP, data->xshm->seg, 0);
cur_c = xcb_xfixes_get_cursor_image_unchecked(data->xcb);
img_r = xcb_shm_get_image_reply(data->xcb, img_c, NULL);
cur_r = xcb_xfixes_get_cursor_image_reply(data->xcb, cur_c, NULL);
if (!img_r)
goto exit;
obs_enter_graphics();
gs_texture_set_image(data->texture, (void *) data->xshm->data,
data->width * 4, false);
xcb_xcursor_update(data->cursor, cur_r);
obs_leave_graphics();
exit:
free(img_r);
free(cur_r);
}
/**
* Processing callback
*/
static void Demux (void *opaque)
{
demux_t *demux = opaque;
demux_sys_t *sys = demux->p_sys;
xcb_connection_t *conn = sys->conn;
/* Determine capture region */
xcb_get_geometry_cookie_t gc;
xcb_query_pointer_cookie_t qc;
gc = xcb_get_geometry (conn, sys->window);
if (sys->follow_mouse)
qc = xcb_query_pointer (conn, sys->window);
xcb_get_geometry_reply_t *geo = xcb_get_geometry_reply (conn, gc, NULL);
if (geo == NULL)
{
msg_Err (demux, "bad X11 drawable 0x%08"PRIx32, sys->window);
discard:
if (sys->follow_mouse)
xcb_discard_reply (conn, gc.sequence);
return;
}
int w = sys->w;
int h = sys->h;
int x, y;
if (sys->follow_mouse)
{
xcb_query_pointer_reply_t *ptr =
xcb_query_pointer_reply (conn, qc, NULL);
if (ptr == NULL)
{
free (geo);
return;
}
if (w == 0 || w > geo->width)
w = geo->width;
x = ptr->win_x;
if (x < w / 2)
x = 0;
else if (x >= (int)geo->width - (w / 2))
x = geo->width - w;
else
x -= w / 2;
if (h == 0 || h > geo->height)
h = geo->height;
y = ptr->win_y;
if (y < h / 2)
y = 0;
else if (y >= (int)geo->height - (h / 2))
y = geo->height - h;
else
y -= h / 2;
}
else
{
int max;
x = sys->x;
max = (int)geo->width - x;
if (max <= 0)
goto discard;
if (w == 0 || w > max)
w = max;
y = sys->y;
max = (int)geo->height - y;
if (max <= 0)
goto discard;
if (h == 0 || h > max)
h = max;
}
/* Update elementary stream format (if needed) */
if (w != sys->cur_w || h != sys->cur_h)
{
if (sys->es != NULL)
es_out_Del (demux->out, sys->es);
/* Update composite pixmap */
if (sys->window != geo->root)
{
xcb_free_pixmap (conn, sys->pixmap); /* no-op first time */
xcb_composite_name_window_pixmap (conn, sys->window, sys->pixmap);
xcb_create_pixmap (conn, geo->depth, sys->pixmap,
geo->root, geo->width, geo->height);
}
sys->es = InitES (demux, w, h, geo->depth, &sys->bpp);
if (sys->es != NULL)
{
sys->cur_w = w;
sys->cur_h = h;
sys->bpp /= 8; /* bits -> bytes */
}
}
/* Capture screen */
xcb_drawable_t drawable =
(sys->window != geo->root) ? sys->pixmap : sys->window;
free (geo);
block_t *block = NULL;
#if HAVE_SYS_SHM_H
if (sys->shm)
{ /* Capture screen through shared memory */
size_t size = w * h * sys->bpp;
int id = shmget (IPC_PRIVATE, size, IPC_CREAT | 0777);
if (id == -1) /* XXX: fallback */
{
msg_Err (demux, "shared memory allocation error: %m");
goto noshm;
}
/* Attach the segment to X and capture */
xcb_shm_get_image_reply_t *img;
xcb_shm_get_image_cookie_t ck;
xcb_shm_attach (conn, sys->segment, id, 0 /* read/write */);
ck = xcb_shm_get_image (conn, drawable, x, y, w, h, ~0,
XCB_IMAGE_FORMAT_Z_PIXMAP, sys->segment, 0);
xcb_shm_detach (conn, sys->segment);
img = xcb_shm_get_image_reply (conn, ck, NULL);
xcb_flush (conn); /* ensure eventual detach */
if (img == NULL)
{
shmctl (id, IPC_RMID, 0);
goto noshm;
}
free (img);
/* Attach the segment to VLC */
void *shm = shmat (id, NULL, 0 /* read/write */);
shmctl (id, IPC_RMID, 0);
if (-1 == (intptr_t)shm)
{
msg_Err (demux, "shared memory attachment error: %m");
return;
}
block = block_shm_Alloc (shm, size);
if (unlikely(block == NULL))
shmdt (shm);
}
noshm:
#endif
if (block == NULL)
{ /* Capture screen through socket (fallback) */
xcb_get_image_reply_t *img;
img = xcb_get_image_reply (conn,
xcb_get_image (conn, XCB_IMAGE_FORMAT_Z_PIXMAP, drawable,
x, y, w, h, ~0), NULL);
if (img == NULL)
return;
uint8_t *data = xcb_get_image_data (img);
size_t datalen = xcb_get_image_data_length (img);
block = block_heap_Alloc (img, data + datalen - (uint8_t *)img);
if (block == NULL)
return;
block->p_buffer = data;
block->i_buffer = datalen;
}
/* Send block - zero copy */
if (sys->es != NULL)
{
block->i_pts = block->i_dts = mdate ();
es_out_Control (demux->out, ES_OUT_SET_PCR, block->i_pts);
es_out_Send (demux->out, sys->es, block);
}
}
