271 lines
8.5 KiB
Groff
271 lines
8.5 KiB
Groff
.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 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 included
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.\" 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, EXPRESS
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.\" 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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.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
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.\" Digital Equipment Corporation
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.\"
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.\" Portions Copyright \(co 1990, 1991 by
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.\" Tektronix, Inc.
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.\"
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.\" Permission to use, copy, modify and distribute this documentation for
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.\" any purpose and without fee is hereby granted, provided that the above
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.\" copyright notice appears in all copies and that both that copyright notice
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.\" and this permission notice appear in all copies, and that the names of
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.\" Digital and Tektronix not be used in in advertising or publicity pertaining
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.\" to this documentation without specific, written prior permission.
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.\" Digital and Tektronix makes no representations about the suitability
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.\" of this documentation for any purpose.
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.\" It is provided "as is" without express or implied warranty.
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.\"
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.\"
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.ds xT X Toolkit Intrinsics \- C Language Interface
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.ds xW Athena X Widgets \- C Language X Toolkit 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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.TH XCreateColormap __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
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.SH NAME
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XCreateColormap, XCopyColormapAndFree, XFreeColormap, XColor \- create, copy, or destroy colormaps and color structure
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.SH SYNTAX
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.HP
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Colormap XCreateColormap\^(\^Display *\fIdisplay\fP\^, Window \fIw\fP\^,
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Visual *\fIvisual\fP\^, int \fIalloc\fP\^);
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.HP
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Colormap XCopyColormapAndFree\^(\^Display *\fIdisplay\fP\^, Colormap
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\fIcolormap\fP\^);
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.HP
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int XFreeColormap\^(\^Display *\fIdisplay\fP\^, Colormap \fIcolormap\fP\^);
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.SH ARGUMENTS
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.IP \fIalloc\fP 1i
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Specifies the colormap entries to be allocated.
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You can pass
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.B AllocNone
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or
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.BR AllocAll .
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.IP \fIcolormap\fP 1i
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Specifies the colormap that you want to create, copy, set, or destroy.
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.IP \fIdisplay\fP 1i
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Specifies the connection to the X server.
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.IP \fIvisual\fP 1i
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Specifies a visual type supported on the screen.
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If the visual type is not one supported by the screen,
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a
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.B BadMatch
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error results.
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.IP \fIw\fP 1i
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Specifies the window on whose screen you want to create a colormap.
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.SH DESCRIPTION
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The
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.B XCreateColormap
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function creates a colormap of the specified visual type for the screen
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on which the specified window resides and returns the colormap ID
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associated with it.
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Note that the specified window is only used to determine the screen.
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.LP
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The initial values of the colormap entries are undefined for the
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visual classes
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.BR GrayScale ,
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.BR PseudoColor ,
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and
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.BR DirectColor .
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For
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.BR StaticGray ,
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.BR StaticColor ,
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and
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.BR TrueColor ,
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the entries have defined values,
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but those values are specific to the visual and are not defined by X.
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For
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.BR StaticGray ,
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.BR StaticColor ,
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and
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.BR TrueColor ,
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alloc must be
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.BR AllocNone ,
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or a
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.B BadMatch
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error results.
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For the other visual classes,
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if alloc is
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.BR AllocNone ,
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the colormap initially has no allocated entries,
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and clients can allocate them.
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For information about the visual types,
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see section 3.1.
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.LP
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If alloc is
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.BR AllocAll ,
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the entire colormap is allocated writable.
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The initial values of all allocated entries are undefined.
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For
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.B GrayScale
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and
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.BR PseudoColor ,
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the effect is as if an
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.B XAllocColorCells
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call returned all pixel values from zero to N \- 1,
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where N is the colormap entries value in the specified visual.
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For
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.BR DirectColor ,
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the effect is as if an
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.B XAllocColorPlanes
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call returned a pixel value of zero and red_mask, green_mask,
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and blue_mask values containing the same bits as the corresponding
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masks in the specified visual.
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However, in all cases,
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none of these entries can be freed by using
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.BR XFreeColors .
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.LP
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.B XCreateColormap
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can generate
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.BR BadAlloc ,
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.BR BadMatch ,
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.BR BadValue ,
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and
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.B BadWindow
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errors.
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.LP
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The
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.B XCopyColormapAndFree
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function creates a colormap of the same visual type and for the same screen
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as the specified colormap and returns the new colormap ID.
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It also moves all of the client's existing allocation from the specified
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colormap to the new colormap with their color values intact
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and their read-only or writable characteristics intact and frees those entries
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in the specified colormap.
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Color values in other entries in the new colormap are undefined.
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If the specified colormap was created by the client with alloc set to
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.BR AllocAll ,
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the new colormap is also created with
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.BR AllocAll ,
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all color values for all entries are copied from the specified colormap,
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and then all entries in the specified colormap are freed.
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If the specified colormap was not created by the client with
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.BR AllocAll ,
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the allocations to be moved are all those pixels and planes
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that have been allocated by the client using
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.BR XAllocColor ,
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.BR XAllocNamedColor ,
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.BR XAllocColorCells ,
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or
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.B XAllocColorPlanes
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and that have not been freed since they were allocated.
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.LP
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.B XCopyColormapAndFree
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can generate
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.B BadAlloc
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and
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.B BadColor
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errors.
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.LP
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The
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.B XFreeColormap
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function deletes the association between the colormap resource ID
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and the colormap and frees the colormap storage.
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However, this function has no effect on the default colormap for a screen.
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If the specified colormap is an installed map for a screen,
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it is uninstalled (see
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.BR XUninstallColormap ).
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If the specified colormap is defined as the colormap for a window (by
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.BR XCreateWindow ,
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.BR XSetWindowColormap ,
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or
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.BR XChangeWindowAttributes ),
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.B XFreeColormap
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changes the colormap associated with the window to
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.B None
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and generates a
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.B ColormapNotify
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event.
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X does not define the colors displayed for a window with a colormap of
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.BR None .
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.LP
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.B XFreeColormap
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can generate a
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.B BadColor
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error.
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.SH STRUCTURES
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The
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.B XColor
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structure contains:
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.LP
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.EX
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typedef struct {
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unsigned long pixel; /\&* pixel value */
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unsigned short red, green, blue; /\&* rgb values */
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char flags; /\&* DoRed, DoGreen, DoBlue */
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char pad;
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} XColor;
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.EE
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.LP
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The red, green, and blue values are always in the range 0 to 65535
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inclusive, independent of the number of bits actually used in the
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display hardware.
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The server scales these values down to the range used by the hardware.
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Black is represented by (0,0,0),
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and white is represented by (65535,65535,65535).
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.IN "Color"
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In some functions,
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the flags member controls which of the red, green, and blue members is used
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and can be the inclusive OR of zero or more of
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.BR DoRed ,
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.BR DoGreen ,
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and
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.BR DoBlue .
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.SH DIAGNOSTICS
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.TP 1i
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.B BadAlloc
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The server failed to allocate the requested resource or server memory.
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.TP 1i
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.B BadColor
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A value for a Colormap argument does not name a defined Colormap.
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.TP 1i
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.B BadMatch
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An
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.B InputOnly
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window is used as a Drawable.
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.TP 1i
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.B BadMatch
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Some argument or pair of arguments has the correct type and range but fails
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to match in some other way required by the request.
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.TP 1i
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.B BadValue
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Some numeric value falls outside the range of values accepted by the request.
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Unless a specific range is specified for an argument, the full range defined
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by the argument's type is accepted.
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Any argument defined as a set of
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alternatives can generate this error.
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.TP 1i
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.B BadWindow
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A value for a Window argument does not name a defined Window.
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.SH "SEE ALSO"
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XAllocColor(__libmansuffix__),
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XChangeWindowAttributes(__libmansuffix__),
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XCreateWindow(__libmansuffix__),
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XQueryColor(__libmansuffix__),
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XStoreColors(__libmansuffix__)
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.br
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\fI\*(xL\fP
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