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);
60 xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, uint32_t mask, uint32_t *values) {
61 xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
62 xcb_window_t result = xcb_generate_id(conn);
63 xcb_void_cookie_t cookie;
65 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
66 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
68 cookie = xcb_create_window_checked(conn,
70 result, /* the window id */
71 root, /* parent == root */
72 dims.x, dims.y, dims.width, dims.height, /* dimensions */
73 0, /* border = 0, we draw our own */
75 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
78 check_error(conn, cookie, "Could not create window");
80 /* Map the window (= make it visible) */
81 xcb_map_window(conn, result);
87 * Changes a single value in the graphic context (so one doesn’t have to define an array of values)
90 void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
91 xcb_change_gc(conn, gc, mask, &value);
95 * Draws a line from x,y to to_x,to_y using the given color
98 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
99 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
100 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
101 xcb_point_t points[] = {{x, y}, {to_x, to_y}};
102 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);