XcmsStoreColor(3X11) XLIB FUNCTIONS XcmsStoreColor(3X11)
NAME
XcmsStoreColor, XcmsStoreColors - set colors
SYNTAX
Status XcmsStoreColor(Display *display, Colormap colormap,
XcmsColor *color);
Status XcmsStoreColors(Display *display, Colormap colormap,
XcmsColor colors[], int ncolors, Bool
compression_flags_return[]);
ARGUMENTS
display Specifies the connection to the X server.
color Specifies the color cell and the color to store.
Values specified in this XcmsColor structure
remain unchanged on return.
colors Specifies the color specification array of
XcmsColor structures, each specifying a color cell
and the color to store in that cell. Values speci-
fied in the array remain unchanged upon return.
colormap Specifies the colormap.
compression_flags_return
Returns an array of Boolean values indicating
compression status. If a non-NULL pointer is sup-
plied, each element of the array is set to True if
the corresponding color was compressed and False
otherwise. Pass NULL if the compression status is
not useful.
ncolors Specifies the number of XcmsColor structures in
the color-specification array.
DESCRIPTION
The XcmsStoreColor function converts the color specified in
the XcmsColor structure into RGB values. It then uses this
RGB specification in an XColor structure, whose three flags
(DoRed, DoGreen, and DoBlue) are set, in a call to
XStoreColor to change the color cell specified by the pixel
member of the XcmsColor structure. This pixel value must be
a valid index for the specified colormap, and the color cell
specified by the pixel value must be a read/write cell. If
the pixel value is not a valid index, a BadValue error
results. If the color cell is unallocated or is allocated
read-only, a BadAccess error results. If the colormap is an
installed map for its screen, the changes are visible
immediately.
XFree86 Version 4.5.0 1
XcmsStoreColor(3X11) XLIB FUNCTIONS XcmsStoreColor(3X11)
Note that XStoreColor has no return value; therefore, an
XcmsSuccess return value from this function indicates that
the conversion to RGB succeeded and the call to XStoreColor
was made. To obtain the actual color stored, use
XcmsQueryColor. Because of the screen's hardware limitations
or gamut compression, the color stored in the colormap may
not be identical to the color specified.
XcmsStoreColor can generate BadAccess, BadColor, and Bad-
Value errors.
The XcmsStoreColors function converts the colors specified
in the array of XcmsColor structures into RGB values and
then uses these RGB specifications in XColor structures,
whose three flags (DoRed, DoGreen, and DoBlue) are set, in a
call to XStoreColors to change the color cells specified by
the pixel member of the corresponding XcmsColor structure.
Each pixel value must be a valid index for the specified
colormap, and the color cell specified by each pixel value
must be a read/write cell. If a pixel value is not a valid
index, a BadValue error results. If a color cell is unallo-
cated or is allocated read-only, a BadAccess error results.
If more than one pixel is in error, the one that gets
reported is arbitrary. If the colormap is an installed map
for its screen, the changes are visible immediately.
Note that XStoreColors has no return value; therefore, an
XcmsSuccess return value from this function indicates that
conversions to RGB succeeded and the call to XStoreColors
was made. To obtain the actual colors stored, use
XcmsQueryColors. Because of the screen's hardware limita-
tions or gamut compression, the colors stored in the color-
map may not be identical to the colors specified.
XcmsStoreColors can generate BadAccess, BadColor, and Bad-
Value errors.
DIAGNOSTICS
BadAccess A client attempted to free a color map entry that
it did not already allocate.
BadAccess A client attempted to store into a read-only color
map entry.
BadColor A value for a Colormap argument does not name a
defined Colormap.
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
XFree86 Version 4.5.0 2
XcmsStoreColor(3X11) XLIB FUNCTIONS XcmsStoreColor(3X11)
generate this error.
SEE ALSO
XcmsAllocColor(3X11), XcmsQueryColor(3X11)
Xlib - C Language X Interface
XFree86 Version 4.5.0 3