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XvGetStill - capture a single frame of video from a drawable
include
"Xvlib.h"
XvGetStill(dpy, port, d, gc, vx, vy, vw, vh, dx, dy, dw, dh)
register
Display *dpy;
XvPortID port;
Drawable d;
GC gc;
int vx, vy, dx, dy;
unsigned int vw, vh;
unsigned int dw, dh;
- dpy
- Specifies the display screen on which
the Xv Server is to accept requests from Xv clients. If the display option
is not specified, Xv uses the display screen specified by your DISPLAY
environment variable. The display option has the format hostname:number.
Using two colons (::) instead of one (:) indicates that DECnet is to be
used for transport.
- port
- Defines the port to which the still is outputed.
- d
- Defines the drawable from which the still is to be captured. Pixmaps are
currently not supported.
- gc
- Defines the graphical context. GC components
are: subwindow-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.
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 drawable.
- [Success]
- Returned if XvGetStill(3X)
completed
successfully.
- [XvBadExtension]
- Returned if the Xv extension is unavailable.
- [XvBadAlloc]
- Returned if XvGetStill(3X)
failed to allocate memory to process
the request.
- [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.
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