aboutsummaryrefslogtreecommitdiff
path: root/libX11/man/XQueryColor.man
blob: 65424421eb13499537ba007cd7f7f8f2710b05e0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
'\" 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
.TH XQueryColor __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
.SH NAME
XQueryColor, XQueryColors, XLookupColor, XParseColor \- obtain color values
.SH SYNTAX
.HP
int XQueryColor\^(\^Display *\fIdisplay\fP\^, Colormap \fIcolormap\fP\^, XColor
*\fIdef_in_out\fP\^); 
.HP
int XQueryColors\^(\^Display *\fIdisplay\fP\^, Colormap \fIcolormap\fP\^,
XColor \fIdefs_in_out\fP[\^]\^, int \fIncolors\fP\^); 
.HP
Status XLookupColor\^(\^Display *\fIdisplay\fP\^, Colormap \fIcolormap\fP\^,
char *\fIcolor_name\fP\^, XColor *\fIexact_def_return\fP\^, XColor
*\fIscreen_def_return\fP\^); 
.HP
Status XParseColor\^(\^Display *\fIdisplay\fP\^, Colormap \fIcolormap\fP\^,
char *\fIspec\fP\^, XColor *\fIexact_def_return\fP\^); 
.SH ARGUMENTS
.IP \fIcolormap\fP 1i
Specifies the colormap.
.IP \fIcolor_name\fP 1i
Specifies the color name string (for example, red) whose color 
definition structure you want returned.
.IP \fIdef_in_out\fP 1i
Specifies and returns the RGB values for the pixel specified in the structure.
.IP \fIdefs_in_out\fP 1i
Specifies and returns an array of color definition structures for the pixel
specified in the structure.
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.IP \fIexact_def_return\fP 1i
Returns the exact RGB values.
.IP \fIncolors\fP 1i
.\"Specifies the number of color definition structures. 
Specifies the number of 
.ZN XColor
structures in the color definition array.
.IP \fIscreen_def_return\fP 1i
Returns the closest RGB values provided by the hardware.
.IP \fIspec\fP 1i
Specifies the color name string;
case is ignored.
.IP \fIexact_def_return\fP 1i
Returns the exact color value for later use and sets the
.ZN DoRed ,
.ZN DoGreen ,
and
.ZN DoBlue
flags.
.SH DESCRIPTION
The
.ZN XQueryColor
function returns the current RGB value for the pixel in the
.ZN XColor
structure and sets the
.ZN DoRed ,
.ZN DoGreen ,
and
.ZN DoBlue
flags.
The
.ZN XQueryColors
function returns the RGB value for each pixel in each
.ZN XColor
structure and sets the
.ZN DoRed ,
.ZN DoGreen ,
and
.ZN DoBlue
flags in each structure.

.LP
.ZN XQueryColor
and
.ZN XQueryColors
can generate
.ZN BadColor
and
.ZN BadValue 
errors.
.LP
The
.ZN XLookupColor
function looks up the string name of a color with respect to the screen
associated with the specified colormap.
It returns both the exact color values and
the closest values provided by the screen 
with respect to the visual type of the specified colormap.
If the color name is not in the Host Portable Character Encoding, 
the result is implementation-dependent.
Use of uppercase or lowercase does not matter.
.ZN XLookupColor
returns nonzero if the name is resolved;
otherwise, it returns zero.
.LP
The
.ZN XParseColor
function looks up the string name of a color with respect to the screen
associated with the specified colormap.
It returns the exact color value.
If the color name is not in the Host Portable Character Encoding, 
the result is implementation-dependent.
Use of uppercase or lowercase does not matter.
.ZN XParseColor
returns nonzero if the name is resolved;
otherwise, it returns zero.
.LP
.ZN XLookupColor
and
.ZN XParseColor
can generate
.ZN BadColor 
error.
.SH "COLOR NAMES"
An RGB Device specification is identified by
the prefix ``rgb:'' and conforms to the following syntax:
.LP
.\" Start marker code here
.Ds 0
rgb:\fI<red>/<green>/<blue>\fP

    \fI<red>\fP, \fI<green>\fP, \fI<blue>\fP := \fIh\fP | \fIhh\fP | \fIhhh\fP | \fIhhhh\fP
    \fIh\fP := single hexadecimal digits (case insignificant)
.De
.\" End marker code here
.LP
Note that \fIh\fP indicates the value scaled in 4 bits, 
\fIhh\fP the value scaled in 8 bits,
\fIhhh\fP the value scaled in 12 bits,
and \fIhhhh\fP the value scaled in 16 bits, respectively.
.LP
For backward compatibility, an older syntax for RGB Device is
supported, but its continued use is not encouraged.
The syntax is an initial sharp sign character followed by
a numeric specification, in one of the following formats:
.LP
.TS
l l.
\&#RGB	(4 bits each)
\&#RRGGBB	(8 bits each)
\&#RRRGGGBBB	(12 bits each)
\&#RRRRGGGGBBBB	(16 bits each)
.TE
.LP
The R, G, and B represent single hexadecimal digits.
When fewer than 16 bits each are specified, 
they represent the most significant bits of the value
(unlike the ``rgb:'' syntax, in which values are scaled).
For example, the string ``#3a7'' is the same as ``#3000a0007000''.
.LP
An RGB intensity specification is identified
by the prefix ``rgbi:'' and conforms to the following syntax:
.LP
.\" Start marker code here
.Ds 0
rgbi:\fI<red>/<green>/<blue>\fP
.De
.\" End marker code here
.LP
Note that red, green, and blue are floating-point values
between 0.0 and 1.0, inclusive.
The input format for these values is an optional sign,
a string of numbers possibly containing a decimal point,
and an optional exponent field containing an E or e 
followed by a possibly signed integer string.
.LP
The standard device-independent string specifications have
the following syntax:
.LP
.\" Start marker code here
.Ds 0
CIEXYZ:\fI<X>/<Y>/<Z>\fP
CIEuvY:\fI<u>/<v>/<Y>\fP
CIExyY:\fI<x>/<y>/<Y>\fP
CIELab:\fI<L>/<a>/<b>\fP
CIELuv:\fI<L>/<u>/<v>\fP
TekHVC:\fI<H>/<V>/<C>\fP
.De
.\" End marker code here
.LP
All of the values (C, H, V, X, Y, Z, a, b, u, v, y, x) are
floating-point values.
The syntax for these values is an optional plus or minus sign,
a string of digits possibly containing a decimal point,
and an optional exponent field consisting of an ``E'' or ``e''
followed by an optional plus or minus followed by a string of digits.
.SH DIAGNOSTICS
.TP 1i
.ZN BadColor
A value for a Colormap argument does not name a defined Colormap.
.TP 1i
.ZN BadValue
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted.  Any argument defined as a set of
alternatives can generate this error.
.SH "SEE ALSO"
XAllocColor(__libmansuffix__),
XCreateColormap(__libmansuffix__),
XStoreColors(__libmansuffix__)
.br
\fI\*(xL\fP