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.\" Copyright 1993 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining
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.\" a copy of this software and associated documentation files (the
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.\" "Software"), to deal in the Software without restriction, including
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.\" without limitation the rights to use, copy, modify, merge, publish,
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.\" distribute, sublicense, and/or sell copies of the Software, and to
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.\" permit persons to whom the Software is furnished to do so, subject to
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.\" the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be
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.\" included in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
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.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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.\" OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall
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.\" not be used in advertising or otherwise to promote the sale, use or
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.\" other dealings in this Software without prior written authorization
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.\" from the X Consortium.
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.\"
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.ds tk X Toolkit
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xI Intrinsics
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.ds xW X Toolkit Athena Widgets \- C Language Interface
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.ds xL Xlib \- C Language X Interface
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.ds xC Inter-Client Communication Conventions Manual
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.ds Rn 3
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.ds Vn 2.2
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.hw XtAdd-Exposure-To-Region wid-get
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.na
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.TH XtAddExposureToRegion __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAddExposureToRegion \- merge exposure events into a region
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.SH SYNTAX
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#include <X11/Intrinsic.h>
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.HP
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void XtAddExposureToRegion(XEvent *\fIevent\fP, Region \fIregion\fP);
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.SH ARGUMENTS
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.IP \fIevent\fP 1i
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Specifies a pointer to the
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.B Expose
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or
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.B GraphicsExpose
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event.
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.IP \fIregion\fP 1i
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Specifies the region object (as defined in
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.BR <X11/Xutil.h> ).
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.SH DESCRIPTION
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The
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.B XtAddExposureToRegion
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function computes the union of the rectangle defined by the exposure
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event and the specified region.
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Then, it stores the results back in region.
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If the event argument is not an
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.B Expose
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or
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.B GraphicsExpose
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event,
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.B XtAddExposureToRegion
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returns without an error and without modifying region.
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.LP
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This function is used by the exposure compression mechanism
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(see Section 7.9.3).
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.SH "SEE ALSO"
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.br
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\fI\*(xT\fP
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.br
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\fI\*(xL\fP
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