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XcmsAllocColor(3) XLIB FUNCTIONS XcmsAllocColor(3)
NAME
XcmsAllocColor, XcmsAllocNamedColor - allocate colors
SYNTAX
Status XcmsAllocColor(Display *display, Colormap colormap, XcmsColor *color_in_out, Xcms-
ColorFormat result_format);
Status XcmsAllocNamedColor(Display *display, Colormap colormap, char *color_string, Xcms-
Color *color_screen_return, XcmsColor *color_exact_return, XcmsColorFormat
result_format);
ARGUMENTS
display Specifies the connection to the X server.
colormap Specifies the colormap.
color_exact_return
Returns the color specification parsed from the color string or parsed from the
corresponding string found in a color-name database.
color_in_out
Specifies the color to allocate and returns the pixel and color that is actually
used in the colormap.
color_screen_return
Returns the pixel value of the color cell and color specification that actually
is stored for that cell.
color_string
Specifies the color string whose color definition structure is to be returned.
result_format
Specifies the color format for the returned color specification.
DESCRIPTION
The XcmsAllocColor function is similar to XAllocColor except the color can be specified in
any format. The XcmsAllocColor function ultimately calls XAllocColor to allocate a read-
only color cell (colormap entry) with the specified color. XcmsAllocColor first converts
the color specified to an RGB value and then passes this to XAllocColor. XcmsAllocColor
returns the pixel value of the color cell and the color specification actually allocated.
This returned color specification is the result of converting the RGB value returned by
XAllocColor into the format specified with the result_format argument. If there is no
interest in a returned color specification, unnecessary computation can be bypassed if
result_format is set to XcmsRGBFormat. The corresponding colormap cell is read-only. If
this routine returns XcmsFailure, the color_in_out color specification is left unchanged.
XcmsAllocColor can generate a BadColor errors.
The XcmsAllocNamedColor function is similar to XAllocNamedColor except that the color
returned can be in any format specified. This function ultimately calls XAllocColor to
allocate a read-only color cell with the color specified by a color string. The color
string is parsed into an XcmsColor structure (see XcmsLookupColor), converted to an RGB
value, and finally passed to XAllocColor. 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.
This function returns both the color specification as a result of parsing (exact specifi-
cation) and the actual color specification stored (screen specification). This screen
specification is the result of converting the RGB value returned by XAllocColor into the
format specified in result_format. If there is no interest in a returned color specifica-
tion, unnecessary computation can be bypassed if result_format is set to XcmsRGBFormat.
If color_screen_return and color_exact_return point to the same structure, the pixel field
will be set correctly, but the color values are undefined.
XcmsAllocNamedColor can generate a BadColor errors.
DIAGNOSTICS
BadColor A value for a Colormap argument does not name a defined Colormap.
SEE ALSO
XcmsQueryColor(3X11), XcmsStoreColor(3X11)
Xlib - C Language X Interface
X Version 11 libX11 1.2.1 XcmsAllocColor(3) |
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