IABSD.fr/xenocara/lib/libXv/man/XvCreateImage.man

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• Author : matthieu
  Date : 2009-10-31 18:54:56
  Hash : 03c653d1
  Message : update to libXv 1.0.5

• lib/libXv/man/XvCreateImage.man

• .TH XvCreateImage __libmansuffix__ __vendorversion__ "libXv Functions"
  .SH NAME
  XvCreateImage, XvShmCreateImage \- create an XvImage
  .\"
  .SH SYNOPSIS
  .B #include <X11/extensions/Xvlib.h>
  .sp
  .nf
  .BI "XvImage * XvCreateImage (Display *" dpy ", XvPortID " port ","
  .BI "                         int " id ", char *" data ","
  .BI "                         int " width ", int " height ");"
  .sp
  .BI "XvImage * XvShmCreateImage (Display *" dpy ", XvPortID " port ","
  .BI "                            int " id ", char *" data ","
  .BI "                            int " width ", int " height ","
  .BI "                            XShmSegmentInfo *" shminfo ");"
  .fi
  .SH ARGUMENTS
  .\"
  .IP \fIdpy\fR 8
  Specifies the connection to the X server.
  .IP \fIport\fR 8
  Specifies the port the XvImage will be used with.
  .IP \fIid\fR 8
  Specifies the format of the image to be created by the XvImageFormatValues id.
  .IP \fIdata\fR 8
  Specifies the image data.
  .IP "\fIwidth\fR, \fIheight\fR" 8
  Specifies the desired width and height of the image.
  .\"
  .SH DESCRIPTION
  .BR XvCreateImage (__libmansuffix__)
  is similar to
  .BR XCreateImage (__libmansuffix__).
  .BR XvShmCreateImage (__libmansuffix__)
  is similar to
  .BR XShmCreateImage (__libmansuffix__).
  The library will allocate the XvImage structure and fill out all
  fields except for \fIdata\fR.  \fIWidth\fR and \fIheight\fR may be
  enlarged in some YUV formats.  The size of the data buffer that needs
  to be allocated will be given in the \fIdata_size\fR field in the XvImage.
  Image data is not allocated by this function.  The client may pass a pointer
  to the preallocated memory as \fIdata\fR or may allocate the memory and fill in
  the XvImage structure's data field after the \fIdata_size\fR field has
  been filled out by the server.  The XvImage structure may be freed by
  .BR XFree (__libmansuffix__).
  Shared memory segments are attached/detached with
  .BR XShmAttach (__libmansuffix__)/ XShmDetach (__libmansuffix__).
  .SH RETURN VALUES
  XvImage has the following structure:
  .EX
  
  typedef struct {
     int id;
     int width, height;
     int data_size;
     int num_planes;
     int *pitches;
     int *offsets;
     char *data;
     XPointer obdata;
  } XvImage;
  
  .EE
  .IP \fIid\fR 8
  A descriptor for the format from the XvImageFormatValues structure
  returned by
  .BR XvListImageFormats (__libmansuffix__).
  .IP "\fIwidth, height\fR" 8
  The width and height of the image in pixels.
  .IP \fIdata_size\fR 8
  The size of the data buffer in bytes.
  .IP \fInum_planes\fR 8
  The number of image planes.
  .IP \fIpitches\fR 8
  An array of size \fInum_planes\fR indicating the scanline pitch
  in bytes.  Each plane may have a different pitch.
  .IP \fIoffsets\fR 8
  An array of size \fInum_planes\fR indicating the byte offset
  from \fIdata\fR to the start of each plane.
  .IP \fIdata\fR 8
  A pointer to the start of the data buffer.
  .IP \fIobdata\fR 8
  A private field for holding SHM info.  This field will be
  set up by the client libraries so the programmer will
  generally need not be concerned with this field.
  .\"
  .SH DIAGNOSTICS
  .IP [XvBadPort] 8
  Generated if the requested port does not exist.
  .IP [XvBadAlloc] 8
  Generated if the X server was unable to allocate resources required
  to complete the operation.
  .IP [BadMatch] 8
  Generated if incompatible arguments were supplied, such as a port that
  isn't capable of displaying XvImages.
  .\"
  .SH SEE ALSO
  .BR XvListImageFormats (__libmansuffix__),
  .BR XCreateImage (__libmansuffix__),
  .BR XShmCreateImage (__libmansuffix__),
  .BR XShmAttach (__libmansuffix__),
  .BR XShmDetach (__libmansuffix__).