4 * i3 - an improved dynamic tiling window manager
6 * © 2009 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
10 * xcb.c: Helper functions for easier usage of XCB
22 * Returns the colorpixel to use for the given hex color (think of HTML).
24 * The hex_color has to start with #, for example #FF00FF.
26 * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
27 * This has to be done by the caller.
30 uint32_t get_colorpixel(xcb_connection_t *conn, xcb_window_t window, char *hex) {
31 /* TODO: We need to store the colorpixels per child to remove these unnecessary requests every time */
32 #define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
33 char strgroups[3][3] = {{hex[1], hex[2], '\0'},
34 {hex[3], hex[4], '\0'},
35 {hex[5], hex[6], '\0'}};
36 int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
37 RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
38 RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
40 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
42 xcb_colormap_t colormap_id = xcb_generate_id(conn);
43 xcb_void_cookie_t cookie = xcb_create_colormap_checked(conn, XCB_COLORMAP_ALLOC_NONE,
44 colormap_id, window, root_screen->root_visual);
45 check_error(conn, cookie, "Could not create colormap");
46 xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(conn,
47 xcb_alloc_color(conn, colormap_id, rgb16[0], rgb16[1], rgb16[2]), NULL);
50 printf("Could not allocate color\n");
54 uint32_t pixel = reply->pixel;
56 xcb_free_colormap(conn, colormap_id);