'\" See the file "license.terms" for information on usage and redistribution
'\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
'\"
-'\" RCS: @(#) $Id: GetColor.3,v 1.4 2002/08/05 04:30:38 dgp Exp $
-'\"
-'\" The definitions below are for supplemental macros used in Tcl/Tk
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-'\"
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-'\" Start paragraph describing an argument to a library procedure.
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-'\"
-'\" # Set up traps and other miscellaneous stuff for Tcl/Tk man pages.
+.TH Tk_AllocColorFromObj 3 8.1 Tk "Tk Library Procedures"
+.\" The -*- nroff -*- definitions below are for supplemental macros used
+.\" in Tcl/Tk manual entries.
+.\"
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+.\"
+.\" .AS ?type? ?name?
+.\" Give maximum sizes of arguments for setting tab stops. Type and
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+.\"
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+.\" End code excerpt.
+.\"
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+.\" Begin vertical sidebar, for use in marking newly-changed parts
+.\" of man pages. The first argument is ignored and used for recording
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+.\" omitted, defaults to "options". The options follow on successive
+.\" lines, in three columns separated by tabs.
+.\"
+.\" .SE
+.\" End of list of standard options for a Tk widget.
+.\"
+.\" .OP cmdName dbName dbClass
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+.\" Print an open parenthesis, arg1 in quotes, then arg2 normally
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+.\"
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.if t .wh -1.3i ^B
.nr ^l \n(.l
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-'\" # Start an argument description
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-'\" # DS - begin display
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..
-'\" # DE - end display
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..
-'\" # SO - start of list of standard options
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.SH "STANDARD OPTIONS"
.LP
.nf
.ta 5.5c 11c
.ft B
..
-'\" # SE - end of list of standard options
+.\" # SE - end of list of standard options
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+See the \\*(So manual entry for details on the standard options.
..
-'\" # OP - start of full description for a single option
+.\" # OP - start of full description for a single option
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..
+.\" # UL - underline word
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\\$1\l'|0\(ul'\\$2
..
-.TH Tk_AllocColorFromObj 3 8.1 Tk "Tk Library Procedures"
+.\" # QW - apply quotation marks to word
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+.\"" fix emacs highlighting
+.el \\*(lq\\$1\\*(rq\\$2
+..
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.BS
.SH NAME
Tk_AllocColorFromObj, Tk_GetColor, Tk_GetColorFromObj, Tk_GetColorByValue, Tk_NameOfColor, Tk_FreeColorFromObj, Tk_FreeColor \- maintain database of colors
.SH SYNOPSIS
.nf
\fB#include <tk.h>\fR
-.VS 8.1
.sp
XColor *
\fBTk_AllocColorFromObj(\fIinterp, tkwin, objPtr\fB)\fR
.sp
XColor *
\fBTk_GetColorFromObj(\fItkwin, objPtr\fB)\fR
-.VE
.sp
XColor *
\fBTk_GetColorByValue(\fItkwin, prefPtr\fB)\fR
.sp
-CONST char *
+const char *
\fBTk_NameOfColor(\fIcolorPtr\fB)\fR
.sp
GC
\fBTk_GCForColor(\fIcolorPtr, drawable\fB)\fR
.sp
-.VS 8.1
\fBTk_FreeColorFromObj(\fItkwin, objPtr\fB)\fR
-.VE
.sp
\fBTk_FreeColor(\fIcolorPtr\fB)\fR
.SH ARGUMENTS
Interpreter to use for error reporting.
.AP Tk_Window tkwin in
Token for window in which color will be used.
-.VS 8.1 br
.AP Tcl_Obj *objPtr in/out
String value describes desired color; internal rep will be
modified to cache pointer to corresponding (XColor *).
.AP char *name in
Same as \fIobjPtr\fR except description of color is passed as a string and
-resulting (XColor *) isn't cached.
-.VE
+resulting (XColor *) is not cached.
.AP XColor *prefPtr in
Indicates red, green, and blue intensities of desired
color.
Drawable in which the result graphics context will be used. Must have
same screen and depth as the window for which the color was allocated.
.BE
-
.SH DESCRIPTION
-.VS 8.1
.PP
These procedures manage the colors being used by a Tk application.
They allow colors to be shared whenever possible, so that colormap
.PP
Given a textual description of a color, \fBTk_AllocColorFromObj\fR
locates a pixel value that may be used to render the color
-in a particular window. The desired color is specified with an
-object whose string value must have one of the following forms:
-.VE
+in a particular window. The desired color is specified with a
+value whose string value must have one of the following forms:
.TP 20
\fIcolorname\fR
Any of the valid textual names for a color defined in the
represents a single hexadecimal digit. The four forms permit
colors to be specified with 4-bit, 8-bit, 12-bit or 16-bit values.
When fewer than 16 bits are provided for each color, they represent
-the most significant bits of the color. For example, #3a7 is the
-same as #3000a0007000.
+the most significant bits of the color, while the lower unfilled
+bits will be repeatedly replicated from the available higher bits.
+For example, #3a7 is the same as #3333aaaa7777.
.PP
-.VS 8.1
\fBTk_AllocColorFromObj\fR returns a pointer to
an XColor structure; the structure indicates the exact intensities of
the allocated color (which may differ slightly from those requested,
that may be used to draw with the color in \fItkwin\fR.
If an error occurs in \fBTk_AllocColorFromObj\fR (such as an unknown
color name) then NULL is returned and an error message is stored in
-\fIinterp\fR's result if \fIinterp\fR isn't NULL.
+\fIinterp\fR's result if \fIinterp\fR is not NULL.
If the colormap for \fItkwin\fR is full, \fBTk_AllocColorFromObj\fR
will use the closest existing color in the colormap.
\fBTk_AllocColorFromObj\fR caches information about
.PP
\fBTk_GetColor\fR is identical to \fBTk_AllocColorFromObj\fR except
that the description of the color is specified with a string instead
-of an object. This prevents \fBTk_GetColor\fR from caching the
+of a value. This prevents \fBTk_GetColor\fR from caching the
return value, so \fBTk_GetColor\fR is less efficient than
\fBTk_AllocColorFromObj\fR.
.PP
\fBTk_GetColorFromObj\fR returns the token for an existing color, given
the window and description used to create the color.
-\fBTk_GetColorFromObj\fR doesn't actually create the color; the color
+\fBTk_GetColorFromObj\fR does not actually create the color; the color
must already have been created with a previous call to
\fBTk_AllocColorFromObj\fR or \fBTk_GetColor\fR. The return
value is cached in \fIobjPtr\fR, which speeds up
future calls to \fBTk_GetColorFromObj\fR with the same \fIobjPtr\fR
and \fItkwin\fR.
-.VE
.PP
\fBTk_GetColorByValue\fR is similar to \fBTk_GetColor\fR except that
the desired color is indicated with the \fIred\fR, \fIgreen\fR, and
long as \fIcolorPtr\fR exists; it is freed when the last reference
to \fIcolorPtr\fR is freed by calling \fBTk_FreeColor\fR.
.PP
-.VS 8.1
When a color is no longer needed \fBTk_FreeColorFromObj\fR or
\fBTk_FreeColor\fR should be called to release it.
For \fBTk_FreeColorFromObj\fR the color to release is specified
There should be exactly one call to \fBTk_FreeColorFromObj\fR
or \fBTk_FreeColor\fR for each call to \fBTk_AllocColorFromObj\fR,
\fBTk_GetColor\fR, or \fBTk_GetColorByValue\fR.
-.VE
.SH KEYWORDS
-color, intensity, object, pixel value
+color, intensity, value, pixel value
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