diff options
author | marha <marha@users.sourceforge.net> | 2012-08-27 08:17:50 +0200 |
---|---|---|
committer | marha <marha@users.sourceforge.net> | 2012-08-27 08:17:50 +0200 |
commit | b3462c12542a69eeaa3fe90fddfbb15d30c18158 (patch) | |
tree | 294230cca0e59ee250cd70060ba3f8c3742b4023 /libX11/man/XAllocStandardColormap.man | |
parent | e91ed68959d63f79e3b4973bc80c7ebcd07ed021 (diff) | |
download | vcxsrv-b3462c12542a69eeaa3fe90fddfbb15d30c18158.tar.gz vcxsrv-b3462c12542a69eeaa3fe90fddfbb15d30c18158.tar.bz2 vcxsrv-b3462c12542a69eeaa3fe90fddfbb15d30c18158.zip |
xwininfo fontconfig libX11 libXau libXext libxcb mesa pixman
xkeyboard-config git update 27 Aug 2012
Diffstat (limited to 'libX11/man/XAllocStandardColormap.man')
-rw-r--r-- | libX11/man/XAllocStandardColormap.man | 743 |
1 files changed, 338 insertions, 405 deletions
diff --git a/libX11/man/XAllocStandardColormap.man b/libX11/man/XAllocStandardColormap.man index f27b643a4..13cab682e 100644 --- a/libX11/man/XAllocStandardColormap.man +++ b/libX11/man/XAllocStandardColormap.man @@ -1,405 +1,338 @@ -'\" t
-.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
-.\"
-.\" Permission is hereby granted, free of charge, to any person obtaining
-.\" a copy of this software and associated documentation files (the
-.\" "Software"), to deal in the Software without restriction, including
-.\" without limitation the rights to use, copy, modify, merge, publish,
-.\" distribute, sublicense, and/or sell copies of the Software, and to
-.\" permit persons to whom the Software is furnished to do so, subject to
-.\" the following conditions:
-.\"
-.\" The above copyright notice and this permission notice shall be included
-.\" in all copies or substantial portions of the Software.
-.\"
-.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
-.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-.\" OTHER DEALINGS IN THE SOFTWARE.
-.\"
-.\" Except as contained in this notice, the name of the X Consortium shall
-.\" not be used in advertising or otherwise to promote the sale, use or
-.\" other dealings in this Software without prior written authorization
-.\" from the X Consortium.
-.\"
-.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
-.\" Digital Equipment Corporation
-.\"
-.\" Portions Copyright \(co 1990, 1991 by
-.\" Tektronix, Inc.
-.\"
-.\" Permission to use, copy, modify and distribute this documentation for
-.\" any purpose and without fee is hereby granted, provided that the above
-.\" copyright notice appears in all copies and that both that copyright notice
-.\" and this permission notice appear in all copies, and that the names of
-.\" Digital and Tektronix not be used in in advertising or publicity pertaining
-.\" to this documentation without specific, written prior permission.
-.\" Digital and Tektronix makes no representations about the suitability
-.\" of this documentation for any purpose.
-.\" It is provided ``as is'' without express or implied warranty.
-.\"
-.\"
-.ds xT X Toolkit Intrinsics \- C Language Interface
-.ds xW Athena X Widgets \- C Language X Toolkit Interface
-.ds xL Xlib \- C Language X Interface
-.ds xC Inter-Client Communication Conventions Manual
-.na
-.de Ds
-.nf
-.\\$1D \\$2 \\$1
-.ft 1
-.\".ps \\n(PS
-.\".if \\n(VS>=40 .vs \\n(VSu
-.\".if \\n(VS<=39 .vs \\n(VSp
-..
-.de De
-.ce 0
-.if \\n(BD .DF
-.nr BD 0
-.in \\n(OIu
-.if \\n(TM .ls 2
-.sp \\n(DDu
-.fi
-..
-.de FD
-.LP
-.KS
-.TA .5i 3i
-.ta .5i 3i
-.nf
-..
-.de FN
-.fi
-.KE
-.LP
-..
-.de IN \" send an index entry to the stderr
-..
-.de C{
-.KS
-.nf
-.D
-.\"
-.\" choose appropriate monospace font
-.\" the imagen conditional, 480,
-.\" may be changed to L if LB is too
-.\" heavy for your eyes...
-.\"
-.ie "\\*(.T"480" .ft L
-.el .ie "\\*(.T"300" .ft L
-.el .ie "\\*(.T"202" .ft PO
-.el .ie "\\*(.T"aps" .ft CW
-.el .ft R
-.ps \\n(PS
-.ie \\n(VS>40 .vs \\n(VSu
-.el .vs \\n(VSp
-..
-.de C}
-.DE
-.R
-..
-.de Pn
-.ie t \\$1\fB\^\\$2\^\fR\\$3
-.el \\$1\fI\^\\$2\^\fP\\$3
-..
-.de ZN
-.ie t \fB\^\\$1\^\fR\\$2
-.el \fI\^\\$1\^\fP\\$2
-..
-.de hN
-.ie t <\fB\\$1\fR>\\$2
-.el <\fI\\$1\fP>\\$2
-..
-.de NT
-.ne 7
-.ds NO Note
-.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
-.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
-.ie n .sp
-.el .sp 10p
-.TB
-.ce
-\\*(NO
-.ie n .sp
-.el .sp 5p
-.if '\\$1'C' .ce 99
-.if '\\$2'C' .ce 99
-.in +5n
-.ll -5n
-.R
-..
-. \" Note End -- doug kraft 3/85
-.de NE
-.ce 0
-.in -5n
-.ll +5n
-.ie n .sp
-.el .sp 10p
-..
-.ny0
-'\" t
-.TH XAllocStandardColormap __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
-.SH NAME
-XAllocStandardColormap, XSetRGBColormaps, XGetRGBColormaps, XStandardColormap \- allocate, set, or read a standard colormap structure
-.SH SYNTAX
-.HP
-XStandardColormap *XAllocStandardColormap\^(void\^);
-.HP
-void XSetRGBColormaps\^(\^Display *\fIdisplay\fP, Window \fIw\fP,
-XStandardColormap *\fIstd_colormap\fP,
-int \fIcount\fP, Atom \fIproperty\fP\^);
-.HP
-Status XGetRGBColormaps\^(\^Display *\fIdisplay\fP, Window \fIw\fP,
-XStandardColormap **\fIstd_colormap_return\fP, int *\fIcount_return\fP,
-Atom \fIproperty\fP\^);
-.SH ARGUMENTS
-.IP \fIdisplay\fP 1i
-Specifies the connection to the X server.
-.ds Cn colormaps
-.IP \fIcount\fP 1i
-Specifies the number of \*(Cn.
-.ds Cn colormaps
-.IP \fIcount_return\fP 1i
-Returns the number of \*(Cn.
-.IP \fIproperty\fP 1i
-Specifies the property name.
-.IP \fIstd_colormap\fP 1i
-Specifies the
-.ZN XStandardColormap
-structure to be used.
-.IP \fIstd_colormap_return\fP 1i
-Returns the
-.ZN XStandardColormap
-structure.
-.SH DESCRIPTION
-The
-.ZN XAllocStandardColormap
-function allocates and returns a pointer to a
-.ZN XStandardColormap
-structure.
-Note that all fields in the
-.ZN XStandardColormap
-structure are initially set to zero.
-If insufficient memory is available,
-.ZN XAllocStandardColormap
-returns NULL.
-To free the memory allocated to this structure,
-use
-.ZN XFree .
-.LP
-The
-.ZN XSetRGBColormaps
-function replaces the RGB colormap definition in the specified property
-on the named window.
-If the property does not already exist,
-.ZN XSetRGBColormaps
-sets the RGB colormap definition in the specified property
-on the named window.
-The property is stored with a type of RGB_COLOR_MAP and a format of 32.
-Note that it is the caller's responsibility to honor the ICCCM
-restriction that only RGB_DEFAULT_MAP contain more than one definition.
-.LP
-The
-.ZN XSetRGBColormaps
-function usually is only used by window or session managers.
-To create a standard colormap,
-follow this procedure:
-.IP 1. 5
-Open a new connection to the same server.
-.IP 2. 5
-Grab the server.
-.IP 3. 5
-See if the property is on the property list of the root window for the screen.
-.IP 4. 5
-If the desired property is not present:
-.RS
-.IP \(bu 5
-Create a colormap (unless you are using the default colormap of the screen).
-.IP \(bu 5
-Determine the color characteristics of the visual.
-.IP \(bu 5
-Allocate cells in the colormap (or create it with
-.ZN AllocAll ).
-.IP \(bu 5
-Call
-.ZN XStoreColors
-to store appropriate color values in the colormap.
-.IP \(bu 5
-Fill in the descriptive members in the
-.ZN XStandardColormap
-structure.
-.IP \(bu 5
-Attach the property to the root window.
-.IP \(bu 5
-Use
-.ZN XSetCloseDownMode
-to make the resource permanent.
-.RE
-.IP 5. 5
-Ungrab the server.
-.LP
-.ZN XSetRGBColormaps
-can generate
-.ZN BadAlloc ,
-.ZN BadAtom ,
-and
-.ZN BadWindow
-errors.
-.LP
-The
-.ZN XGetRGBColormaps
-function returns the RGB colormap definitions stored
-in the specified property on the named window.
-If the property exists, is of type RGB_COLOR_MAP, is of format 32,
-and is long enough to contain a colormap definition,
-.ZN XGetRGBColormaps
-allocates and fills in space for the returned colormaps
-and returns a nonzero status.
-If the visualid is not present,
-.ZN XGetRGBColormaps
-assumes the default visual for the screen on which the window is located;
-if the killid is not present,
-.ZN None
-is assumed, which indicates that the resources cannot be released.
-Otherwise,
-none of the fields are set, and
-.ZN XGetRGBColormaps
-returns a zero status.
-Note that it is the caller's responsibility to honor the ICCCM
-restriction that only RGB_DEFAULT_MAP contain more than one definition.
-.LP
-.ZN XGetRGBColormaps
-can generate
-.ZN BadAtom
-and
-.ZN BadWindow
-errors.
-.SH STRUCTURES
-The
-.ZN XStandardColormap
-structure contains:
-.LP
-/\&* Hints */
-.TS
-lw(.5i) lw(2i) lw(1i).
-T{
-\&#define
-T} T{
-.ZN ReleaseByFreeingColormap
-T} T{
-( (XID) 1L)
-T}
-.TE
-/\&* Values */
-.IN "XStandardColormap" "" "@DEF@"
-.Ds 0
-.TA .5i 2.5i
-.ta .5i 2.5i
-typedef struct {
- Colormap colormap;
- unsigned long red_max;
- unsigned long red_mult;
- unsigned long green_max;
- unsigned long green_mult;
- unsigned long blue_max;
- unsigned long blue_mult;
- unsigned long base_pixel;
- VisualID visualid;
- XID killid;
-} XStandardColormap;
-.De
-.LP
-The colormap member is the colormap created by the
-.ZN XCreateColormap
-function.
-The red_max, green_max, and blue_max members give the maximum
-red, green, and blue values, respectively.
-Each color coefficient ranges from zero to its max, inclusive.
-For example,
-a common colormap allocation is 3/3/2 (3 planes for red, 3
-planes for green, and 2 planes for blue).
-This colormap would have red_max = 7, green_max = 7,
-and blue_max = 3.
-An alternate allocation that uses only 216 colors is red_max = 5,
-green_max = 5, and blue_max = 5.
-.LP
-The red_mult, green_mult, and blue_mult members give the
-scale factors used to compose a full pixel value.
-(See the discussion of the base_pixel members for further information.)
-For a 3/3/2 allocation, red_mult might be 32,
-green_mult might be 4, and blue_mult might be 1.
-For a 6-colors-each allocation, red_mult might be 36,
-green_mult might be 6, and blue_mult might be 1.
-.LP
-The base_pixel member gives the base pixel value used to
-compose a full pixel value.
-Usually, the base_pixel is obtained from a call to the
-.ZN XAllocColorPlanes
-function.
-Given integer red, green, and blue coefficients in their appropriate
-ranges, one then can compute a corresponding pixel value by
-using the following expression:
-.LP
-.Ds
-.TA .5i 1.5i
-.ta .5i 1.5i
-(r * red_mult + g * green_mult + b * blue_mult + base_pixel) & 0xFFFFFFFF
-.De
-.LP
-For
-.ZN GrayScale
-colormaps,
-only the colormap, red_max, red_mult,
-and base_pixel members are defined.
-The other members are ignored.
-To compute a
-.ZN GrayScale
-pixel value, use the following expression:
-.LP
-.Ds
-.TA .5i 1.5i
-.ta .5i 1.5i
-(gray * red_mult + base_pixel) & 0xFFFFFFFF
-.De
-.LP
-Negative multipliers can be represented by converting the 2's
-complement representation of the multiplier into an unsigned long and
-storing the result in the appropriate _mult field.
-The step of masking by 0xFFFFFFFF effectively converts the resulting
-positive multiplier into a negative one.
-The masking step will take place automatically on many machine architectures,
-depending on the size of the integer type used to do the computation,
-.LP
-The visualid member gives the ID number of the visual from which the
-colormap was created.
-The killid member gives a resource ID that indicates whether
-the cells held by this standard colormap are to be released
-by freeing the colormap ID or by calling the
-.ZN XKillClient
-function on the indicated resource.
-(Note that this method is necessary for allocating out of an existing colormap.)
-.LP
-The properties containing the
-.ZN XStandardColormap
-information have
-the type RGB_COLOR_MAP.
-.SH DIAGNOSTICS
-.TP 1i
-.ZN BadAlloc
-The server failed to allocate the requested resource or server memory.
-.TP 1i
-.ZN BadAtom
-A value for an Atom argument does not name a defined Atom.
-.TP 1i
-.ZN BadWindow
-A value for a Window argument does not name a defined Window.
-.SH "SEE ALSO"
-XAllocColor(__libmansuffix__),
-XCreateColormap(__libmansuffix__),
-XFree(__libmansuffix__),
-XSetCloseDownMode(__libmansuffix__)
-.br
-\fI\*(xL\fP
+'\" t +.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium +.\" +.\" Permission is hereby granted, free of charge, to any person obtaining +.\" a copy of this software and associated documentation files (the +.\" "Software"), to deal in the Software without restriction, including +.\" without limitation the rights to use, copy, modify, merge, publish, +.\" distribute, sublicense, and/or sell copies of the Software, and to +.\" permit persons to whom the Software is furnished to do so, subject to +.\" the following conditions: +.\" +.\" The above copyright notice and this permission notice shall be included +.\" in all copies or substantial portions of the Software. +.\" +.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS +.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF +.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. +.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR +.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, +.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR +.\" OTHER DEALINGS IN THE SOFTWARE. +.\" +.\" Except as contained in this notice, the name of the X Consortium shall +.\" not be used in advertising or otherwise to promote the sale, use or +.\" other dealings in this Software without prior written authorization +.\" from the X Consortium. +.\" +.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by +.\" Digital Equipment Corporation +.\" +.\" Portions Copyright \(co 1990, 1991 by +.\" Tektronix, Inc. +.\" +.\" Permission to use, copy, modify and distribute this documentation for +.\" any purpose and without fee is hereby granted, provided that the above +.\" copyright notice appears in all copies and that both that copyright notice +.\" and this permission notice appear in all copies, and that the names of +.\" Digital and Tektronix not be used in in advertising or publicity pertaining +.\" to this documentation without specific, written prior permission. +.\" Digital and Tektronix makes no representations about the suitability +.\" of this documentation for any purpose. +.\" It is provided ``as is'' without express or implied warranty. +.\" +.\" +.ds xT X Toolkit Intrinsics \- C Language Interface +.ds xW Athena X Widgets \- C Language X Toolkit Interface +.ds xL Xlib \- C Language X Interface +.ds xC Inter-Client Communication Conventions Manual +.na +.de Ds +.nf +.\\$1D \\$2 \\$1 +.ft CW +.\".ps \\n(PS +.\".if \\n(VS>=40 .vs \\n(VSu +.\".if \\n(VS<=39 .vs \\n(VSp +.. +.de De +.ce 0 +.if \\n(BD .DF +.nr BD 0 +.in \\n(OIu +.if \\n(TM .ls 2 +.sp \\n(DDu +.fi +.. +.de IN \" send an index entry to the stderr +.. +.de Pn +.ie t \\$1\fB\^\\$2\^\fR\\$3 +.el \\$1\fI\^\\$2\^\fP\\$3 +.. +.de ZN +.ie t \fB\^\\$1\^\fR\\$2 +.el \fI\^\\$1\^\fP\\$2 +.. +.de hN +.ie t <\fB\\$1\fR>\\$2 +.el <\fI\\$1\fP>\\$2 +.. +.ny0 +'\" t +.TH XAllocStandardColormap __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS" +.SH NAME +XAllocStandardColormap, XSetRGBColormaps, XGetRGBColormaps, XStandardColormap \- allocate, set, or read a standard colormap structure +.SH SYNTAX +.HP +XStandardColormap *XAllocStandardColormap\^(void\^); +.HP +void XSetRGBColormaps\^(\^Display *\fIdisplay\fP, Window \fIw\fP, +XStandardColormap *\fIstd_colormap\fP, +int \fIcount\fP, Atom \fIproperty\fP\^); +.HP +Status XGetRGBColormaps\^(\^Display *\fIdisplay\fP, Window \fIw\fP, +XStandardColormap **\fIstd_colormap_return\fP, int *\fIcount_return\fP, +Atom \fIproperty\fP\^); +.SH ARGUMENTS +.IP \fIdisplay\fP 1i +Specifies the connection to the X server. +.ds Cn colormaps +.IP \fIcount\fP 1i +Specifies the number of \*(Cn. +.ds Cn colormaps +.IP \fIcount_return\fP 1i +Returns the number of \*(Cn. +.IP \fIproperty\fP 1i +Specifies the property name. +.IP \fIstd_colormap\fP 1i +Specifies the +.ZN XStandardColormap +structure to be used. +.IP \fIstd_colormap_return\fP 1i +Returns the +.ZN XStandardColormap +structure. +.SH DESCRIPTION +The +.ZN XAllocStandardColormap +function allocates and returns a pointer to a +.ZN XStandardColormap +structure. +Note that all fields in the +.ZN XStandardColormap +structure are initially set to zero. +If insufficient memory is available, +.ZN XAllocStandardColormap +returns NULL. +To free the memory allocated to this structure, +use +.ZN XFree . +.LP +The +.ZN XSetRGBColormaps +function replaces the RGB colormap definition in the specified property +on the named window. +If the property does not already exist, +.ZN XSetRGBColormaps +sets the RGB colormap definition in the specified property +on the named window. +The property is stored with a type of RGB_COLOR_MAP and a format of 32. +Note that it is the caller's responsibility to honor the ICCCM +restriction that only RGB_DEFAULT_MAP contain more than one definition. +.LP +The +.ZN XSetRGBColormaps +function usually is only used by window or session managers. +To create a standard colormap, +follow this procedure: +.IP 1. 5 +Open a new connection to the same server. +.IP 2. 5 +Grab the server. +.IP 3. 5 +See if the property is on the property list of the root window for the screen. +.IP 4. 5 +If the desired property is not present: +.RS +.IP \(bu 5 +Create a colormap (unless you are using the default colormap of the screen). +.IP \(bu 5 +Determine the color characteristics of the visual. +.IP \(bu 5 +Allocate cells in the colormap (or create it with +.ZN AllocAll ). +.IP \(bu 5 +Call +.ZN XStoreColors +to store appropriate color values in the colormap. +.IP \(bu 5 +Fill in the descriptive members in the +.ZN XStandardColormap +structure. +.IP \(bu 5 +Attach the property to the root window. +.IP \(bu 5 +Use +.ZN XSetCloseDownMode +to make the resource permanent. +.RE +.IP 5. 5 +Ungrab the server. +.LP +.ZN XSetRGBColormaps +can generate +.ZN BadAlloc , +.ZN BadAtom , +and +.ZN BadWindow +errors. +.LP +The +.ZN XGetRGBColormaps +function returns the RGB colormap definitions stored +in the specified property on the named window. +If the property exists, is of type RGB_COLOR_MAP, is of format 32, +and is long enough to contain a colormap definition, +.ZN XGetRGBColormaps +allocates and fills in space for the returned colormaps +and returns a nonzero status. +If the visualid is not present, +.ZN XGetRGBColormaps +assumes the default visual for the screen on which the window is located; +if the killid is not present, +.ZN None +is assumed, which indicates that the resources cannot be released. +Otherwise, +none of the fields are set, and +.ZN XGetRGBColormaps +returns a zero status. +Note that it is the caller's responsibility to honor the ICCCM +restriction that only RGB_DEFAULT_MAP contain more than one definition. +.LP +.ZN XGetRGBColormaps +can generate +.ZN BadAtom +and +.ZN BadWindow +errors. +.SH STRUCTURES +The +.ZN XStandardColormap +structure contains: +.LP +/\&* Hints */ +.TS +lw(.5i) lw(2i) lw(1i). +T{ +\&#define +T} T{ +.ZN ReleaseByFreeingColormap +T} T{ +( (XID) 1L) +T} +.TE +/\&* Values */ +.IN "XStandardColormap" "" "@DEF@" +.Ds 0 +typedef struct { + Colormap colormap; + unsigned long red_max; + unsigned long red_mult; + unsigned long green_max; + unsigned long green_mult; + unsigned long blue_max; + unsigned long blue_mult; + unsigned long base_pixel; + VisualID visualid; + XID killid; +} XStandardColormap; +.De +.LP +The colormap member is the colormap created by the +.ZN XCreateColormap +function. +The red_max, green_max, and blue_max members give the maximum +red, green, and blue values, respectively. +Each color coefficient ranges from zero to its max, inclusive. +For example, +a common colormap allocation is 3/3/2 (3 planes for red, 3 +planes for green, and 2 planes for blue). +This colormap would have red_max = 7, green_max = 7, +and blue_max = 3. +An alternate allocation that uses only 216 colors is red_max = 5, +green_max = 5, and blue_max = 5. +.LP +The red_mult, green_mult, and blue_mult members give the +scale factors used to compose a full pixel value. +(See the discussion of the base_pixel members for further information.) +For a 3/3/2 allocation, red_mult might be 32, +green_mult might be 4, and blue_mult might be 1. +For a 6-colors-each allocation, red_mult might be 36, +green_mult might be 6, and blue_mult might be 1. +.LP +The base_pixel member gives the base pixel value used to +compose a full pixel value. +Usually, the base_pixel is obtained from a call to the +.ZN XAllocColorPlanes +function. +Given integer red, green, and blue coefficients in their appropriate +ranges, one then can compute a corresponding pixel value by +using the following expression: +.LP +.Ds +(r * red_mult + g * green_mult + b * blue_mult + base_pixel) & 0xFFFFFFFF +.De +.LP +For +.ZN GrayScale +colormaps, +only the colormap, red_max, red_mult, +and base_pixel members are defined. +The other members are ignored. +To compute a +.ZN GrayScale +pixel value, use the following expression: +.LP +.Ds +(gray * red_mult + base_pixel) & 0xFFFFFFFF +.De +.LP +Negative multipliers can be represented by converting the 2's +complement representation of the multiplier into an unsigned long and +storing the result in the appropriate _mult field. +The step of masking by 0xFFFFFFFF effectively converts the resulting +positive multiplier into a negative one. +The masking step will take place automatically on many machine architectures, +depending on the size of the integer type used to do the computation, +.LP +The visualid member gives the ID number of the visual from which the +colormap was created. +The killid member gives a resource ID that indicates whether +the cells held by this standard colormap are to be released +by freeing the colormap ID or by calling the +.ZN XKillClient +function on the indicated resource. +(Note that this method is necessary for allocating out of an existing colormap.) +.LP +The properties containing the +.ZN XStandardColormap +information have +the type RGB_COLOR_MAP. +.SH DIAGNOSTICS +.TP 1i +.ZN BadAlloc +The server failed to allocate the requested resource or server memory. +.TP 1i +.ZN BadAtom +A value for an Atom argument does not name a defined Atom. +.TP 1i +.ZN BadWindow +A value for a Window argument does not name a defined Window. +.SH "SEE ALSO" +XAllocColor(__libmansuffix__), +XCreateColormap(__libmansuffix__), +XFree(__libmansuffix__), +XSetCloseDownMode(__libmansuffix__) +.br +\fI\*(xL\fP |