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XtAddExposureToRegion(3Xt)


X11R6


NAME

  XtAddExposureToRegion - merge exposure events into a region


SYNOPSIS

  void XtAddExposureToRegion(event, region)
	  XEvent *event;
	  Region region;


ARGUMENTS

  event	  Specifies a pointer to the Expose or GraphicsExpose event.

  region  Specifies the region object (as defined in <X11/Xutil.h>).


DESCRIPTION

  The XtAddExposureToRegion function computes the union of the rectangle
  defined by the exposure event and the specified region. Then, it stores the
  results back in region. If the event argument is not an Expose or
  GraphicsExpose event, XtAddExposureToRegion returns without an error and
  without modifying region.

  This function is used by the exposure compression mechanism (see Section
  7.9.3).


SEE ALSO

  X Toolkit Intrinsics -- C Language Interface

  Xlib -- C Language X Interface

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