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.\" Copyright (c) 1993, 1994 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" 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, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" 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 XtAllocate-GC wid-get
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.na
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.de Ds
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.nf
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.\\$1D \\$2 \\$1
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.ft CW
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.ps \\n(PS
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.\".if \\n(VS>=40 .vs \\n(VSu
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.\".if \\n(VS<=39 .vs \\n(VSp
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..
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.de De
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.ce 0
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.if \\n(BD .DF
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.nr BD 0
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.in \\n(OIu
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.if \\n(TM .ls 2
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.sp \\n(DDu
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.fi
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..
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.de IN \" send an index entry to the stderr
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..
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.de Pn
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.ie t \\$1\fB\^\\$2\^\fR\\$3
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.el \\$1\fI\^\\$2\^\fP\\$3
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..
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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..
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.ny0
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.TH XtAllocateGC __libmansuffix__ __xorgversion__ "XT FUNCTIONS"
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.SH NAME
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XtAllocateGC \- obtain a sharable GC with modifiable fields
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.SH SYNTAX
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.HP
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GC XtAllocateGC(Widget \fIw\fP, Cardinal \fIdepth\fP, XtGCMask
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\fIvalue_mask\fP, XGCValues *\fIvalues\fP, XtGCMask \fIdynamic_mask\fP,
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XtGCMask \fIunused_mask\fP);
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.SH ARGUMENTS
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.IP \fIvalues\fP 1i
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Specifies the actual values for this GC.
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.ds Vm fields of the values are specified
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.IP \fIvalue_mask\fP 1i
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Specifies which \*(Vm.
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.IP \fIw\fP 1i
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Specifies the widget.
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.IP \fIdepth\fP 1i
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Specifies the depth for which the returned GC is valid, or 0.
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.IP \fIdynamic_mask\fP 1i
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Specifies the fields of the GC that will be modified by the caller.
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.IP \fIunused_mask\fP 1i
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Specifies the fields of the GC that will not be needed by the caller.
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.SH DESCRIPTION
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The
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.ZN XtAllocateGC
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function returns a sharable GC that may be modified by the client.
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The \fIscreen\fP field of the specified widget or of the nearest
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widget ancestor of the specified object and the specified \fIdepth\fP
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argument supply the root and drawable depths for which the GC is to
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be valid. If \fIdepth\fP is zero the depth is taken from the \fIdepth\fP
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field of the specified widget or of the nearest widget ancestor of the
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specified object.
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.LP
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The \fIvalue_mask\fP argument specifies the fields of the GC that will
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be initialized with the respective members of the \fIvalues\fP structure.
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The \fIdynamic_mask\fP argument specifies fields that the caller intends
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to modify during program execution. The caller must ensure that the
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corresponding GC field is set prior to each use of the GC. The
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\fIunused_mask\fP argument specifies fields of the GC that are of no
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interest to the caller. The caller may make no assumptions about the
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contents of any fields specified in \fIunused_mask\fP. The caller may
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assume that at all times all fields not specified in either
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\fIdynamic_mask\fP or \fIunused_mask\fP have their default value if
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not specified in \fIvalue_mask\fP or the value specified by \fIvalues\fP.
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If a field is specified in both \fIvalue_mask\fP and \fPdynamic_mask\fP,
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the effect is as if it were specified only in \fIdynamic_mask\fP and
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then immediately set to the value in \fIvalues\fP. If a field is set
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in \fIunused_mask\fP and also in either \fIvalue_mask\fP or
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\fIdynamic_mask\fP, the specification in \fIunused_mask\fP is ignored.
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.LP
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.ZN XtAllocateGC
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tries to minimize the number of unique GCs created by comparing the
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arguments with those of previous calls and returning an existing GC
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when there are no conflicts.
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.ZN XtAllocateGC
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may modify and return an existing GC if it was allocated with a nonzero
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\fIunused_mask\fP.
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.SH "SEE ALSO"
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.ZN XtGetGC
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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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