2. EL 9
  3. libxcb-devel
  4. xcb_alloc_color(3)

Scroll to navigation

xcb_alloc_color(3) XCB Requests xcb_alloc_color(3)

NAME

xcb_alloc_color - Allocate a color

SYNOPSIS

#include <xcb/xproto.h>

Request function

xcb_alloc_color_cookie_t xcb_alloc_color(xcb_connection_t *conn, xcb_colormap_t cmap, uint16_t red, uint16_t green, uint16_t blue);

Reply datastructure

typedef struct xcb_alloc_color_reply_t {


    uint8_t  response_type;


    uint8_t  pad0;


    uint16_t sequence;


    uint32_t length;


    uint16_t red;


    uint16_t green;


    uint16_t blue;


    uint8_t  pad1[2];


    uint32_t pixel;
} xcb_alloc_color_reply_t;

Reply function

xcb_alloc_color_reply_t *xcb_alloc_color_reply(xcb_connection_t *conn, xcb_alloc_color_cookie_t cookie, xcb_generic_error_t **e);

REQUEST ARGUMENTS

The XCB connection to X11.
TODO
The red value of your color.
The green value of your color.
The blue value of your color.

REPLY FIELDS

The type of this reply, in this case XCB_ALLOC_COLOR. This field is also present in the xcb_generic_reply_t and can be used to tell replies apart from each other.
The sequence number of the last request processed by the X11 server.
The length of the reply, in words (a word is 4 bytes).
TODO: NOT YET DOCUMENTED.
TODO: NOT YET DOCUMENTED.
TODO: NOT YET DOCUMENTED.
TODO: NOT YET DOCUMENTED.

DESCRIPTION

Allocates a read-only colormap entry corresponding to the closest RGB value supported by the hardware. If you are using TrueColor, you can take a shortcut and directly calculate the color pixel value to avoid the round trip. But, for example, on 16-bit color setups (VNC), you can easily get the closest supported RGB value to the RGB value you are specifying.

RETURN VALUE

Returns an xcb_alloc_color_cookie_t. Errors have to be handled when calling the reply function xcb_alloc_color_reply.

If you want to handle errors in the event loop instead, use xcb_alloc_color_unchecked. See xcb-requests(3) for details.

ERRORS

The specified colormap cmap does not exist.

SEE ALSO

xcb-requests(3)

AUTHOR

Generated from xproto.xml. Contact xcb@lists.freedesktop.org for corrections and improvements.

libxcb 1.13.1 X Version 11