4 * i3 - an improved dynamic tiling window manager
6 * (c) 2009 Michael Stapelberg and contributors
8 * See file LICENSE for license information.
16 /* All the helper functions needed for efficiently using XCB */
19 * Returns the colorpixel to use for the given hex color (think of HTML).
21 * The hex_color has to start with #, for example #FF00FF.
23 * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
24 * This has to be done by the caller.
27 uint32_t get_colorpixel(xcb_connection_t *conn, xcb_window_t window, char *hex) {
28 #define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
29 char strgroups[3][3] = {{hex[1], hex[2], '\0'},
30 {hex[3], hex[4], '\0'},
31 {hex[5], hex[6], '\0'}};
32 int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
33 RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
34 RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
36 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
38 xcb_colormap_t colormapId = xcb_generate_id(conn);
39 xcb_create_colormap(conn, XCB_COLORMAP_ALLOC_NONE, colormapId, window, root_screen->root_visual);
40 xcb_alloc_color_reply_t *reply = xcb_alloc_color_reply(conn,
41 xcb_alloc_color(conn, colormapId, rgb16[0], rgb16[1], rgb16[2]), NULL);
44 printf("color fail\n");
48 uint32_t pixel = reply->pixel;
50 xcb_free_colormap(conn, colormapId);