XvGetStill(3) XvGetStill(3)
Name
XvGetStill - capture a single frame of video from a drawable
Syntax
#include <X11/extensions/Xvlib.h>
XvGetStill(Display *dpy, XvPortID port, Drawable d, GC gc,
int vx, int vy, unsigned int vw, unsigned int vh,
int dx, int dy, unsigned int dw, unsigned int dh);
Arguments
dpy Specifies the connection to the X server.
port Defines the port to which the still is output'd.
d Defines the drawable from which the still is to be cap-
tured. Pixmaps are currently not supported.
gc Defines the graphical context. GC components are: sub-
window-mode, clip-x-origin, clip-y-origin, and clip-
mask.
vx,vy,vw,vh Define the location and size of the destination video
region into which the still is to be written. vx and vy
define the x and y coordinates of the upper-left corner
of the video region; vw and vh define the width and
height, in pixels, of the video region.
dx,dy,dw,dh Define the location and size of the source drawable from
which the still image is to be captured. dx and dy
define the x and y coordinates of the upper-left corner
of the drawable region; dw and dh define the width and
height, in pixels, of the drawable region.
Description
captures a single frame of video from a drawable. The position and
size of the destination (video) rectangle is specified by vx, vy, vw,
and vh. The position and size of the source (drawable) rectangle is
specified by dx, dy, dw, and dh.
Drawable data is clipped to the bounds of the drawable, scaled to the
requested video region size (or the closest size supported) and clipped
to the bounds of the video encoding. The contents of any region not
updated with drawable data is undefined.
If the port is grabbed by another client, this request is ignored, and
an XvVideoNotify event with detail XvBusy is generated for the draw-
able.
Returned Values
[Success]
Returned if XvGetStill(3) completed successfully.
[XvBadExtension]
Returned if the Xv extension is unavailable.
[XvBadAlloc]
Returned if XvGetStill(3) failed to allocate memory to process
the request.
Diagnostics
[XvBadPort]
Generated if the requested port does not exist.
[BadDrawable]
Generated if the requested drawable does not exist.
[BadGC] Generated if the requested graphics context does not exist.
[BadAlloc]
Generated if there were insufficient resources to process the
request.
See Also
XvPutStill(3), XvGetVideo(3), XvPutVideo(3), XvVideoNotify(3)
X Version 11 libXv 1.0.4 XvGetStill(3)
Mac OS X 10.6 X11 - Generated Sun Mar 7 12:33:22 CST 2010