X11R7.4 - man page for xtallocategc (x11r4 section 3)
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XtAllocateGC(3) XT FUNCTIONS XtAllocateGC(3)
XtAllocateGC - obtain a sharable GC with modifiable fields
GC XtAllocateGC(Widget w, Cardinal depth, XtGCMask value_mask, XGCValues *values, XtGCMask
dynamic_mask, XtGCMask unused_mask);
values Specifies the actual values for this GC.
Specifies which fields of the values are specified.
w Specifies the widget.
depth Specifies the depth for which the returned GC is valid, or 0.
Specifies the fields of the GC that will be modified by the caller.
Specifies the fields of the GC that will not be needed by the caller.
The XtAllocateGC function returns a sharable GC that may be modified by the client. The
screen field of the specified widget or of the nearest widget ancestor of the specified
object and the specified depth argument supply the root and drawable depths for which the
GC is to be valid. If depth is zero the depth is taken from the depth field of the speci-
fied widget or of the nearest widget ancestor of the specified object.
The value_mask argument specifies the fields of the GC that will be initialized with the
respective members of the values structure. The dynamic_mask argument specifies fields
that the caller intends to modify during program execution. The caller must ensure that
the corresponding GC field is set prior to each use of the GC. The unused_mask argument
specifies fields of the GC that are of no interest to the caller. The caller may make no
assumptions about the contents of any fields specified in unused_mask. The caller may
assume that at all times all fields not specified in either dynamic_mask or unused_mask
have their default value if not specified in value_mask or the value specified by values.
If a field is specified in both value_mask and dynamic_mask, the effect is as if it were
specified only in dynamic_mask and then immediately set to the value in values. If a field
is set in unused_mask and also in either value_mask or dynamic_mask, the specification in
unused_mask is ignored.
XtAllocateGC tries to minimize the number of unique GCs created by comparing the arguments
with those of previous calls and returning an existing GC when there are no conflicts.
XtAllocateGC may modify and return an existing GC if it was allocated with a nonzero
X Toolkit Intrinsics - C Language Interface
Xlib - C Language X Interface
X Version 11 libXt 1.0.5 XtAllocateGC(3)
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