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
23 TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
24 SLIST_HEAD(colorpixel_head, Colorpixel) colorpixels;
27 * Loads a font for usage, getting its height. This function is used very often, so it
31 i3Font *load_font(xcb_connection_t *conn, const char *pattern) {
32 /* Check if we got the font cached */
34 TAILQ_FOREACH(font, &cached_fonts, fonts)
35 if (strcmp(font->pattern, pattern) == 0)
38 i3Font *new = smalloc(sizeof(i3Font));
39 xcb_void_cookie_t font_cookie;
40 xcb_list_fonts_with_info_cookie_t info_cookie;
42 /* Send all our requests first */
43 new->id = xcb_generate_id(conn);
44 font_cookie = xcb_open_font_checked(conn, new->id, strlen(pattern), pattern);
45 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
47 check_error(conn, font_cookie, "Could not open font");
49 /* Get information (height/name) for this font */
50 xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
51 exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
53 if (asprintf(&(new->name), "%.*s", xcb_list_fonts_with_info_name_length(reply),
54 xcb_list_fonts_with_info_name(reply)) == -1)
55 die("asprintf() failed\n");
56 new->pattern = sstrdup(pattern);
57 new->height = reply->font_ascent + reply->font_descent;
59 /* Insert into cache */
60 TAILQ_INSERT_TAIL(&cached_fonts, new, fonts);
66 * Returns the colorpixel to use for the given hex color (think of HTML).
68 * The hex_color has to start with #, for example #FF00FF.
70 * NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
71 * This has to be done by the caller.
74 uint32_t get_colorpixel(xcb_connection_t *conn, char *hex) {
75 /* Lookup this colorpixel in the cache */
76 struct Colorpixel *colorpixel;
77 SLIST_FOREACH(colorpixel, &(colorpixels), colorpixels)
78 if (strcmp(colorpixel->hex, hex) == 0)
79 return colorpixel->pixel;
81 #define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
82 char strgroups[3][3] = {{hex[1], hex[2], '\0'},
83 {hex[3], hex[4], '\0'},
84 {hex[5], hex[6], '\0'}};
85 int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
86 RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
87 RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
89 xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
90 xcb_alloc_color_reply_t *reply;
92 reply = xcb_alloc_color_reply(conn, xcb_alloc_color(conn, root_screen->default_colormap,
93 rgb16[0], rgb16[1], rgb16[2]), NULL);
96 printf("Could not allocate color\n");
100 uint32_t pixel = reply->pixel;
103 /* Store the result in the cache */
104 struct Colorpixel *cache_pixel = scalloc(sizeof(struct Colorpixel));
105 cache_pixel->hex = sstrdup(hex);
106 cache_pixel->pixel = pixel;
108 SLIST_INSERT_HEAD(&(colorpixels), cache_pixel, colorpixels);
114 * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
118 xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, int cursor,
119 uint32_t mask, uint32_t *values) {
120 xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
121 xcb_window_t result = xcb_generate_id(conn);
122 xcb_cursor_t cursor_id = xcb_generate_id(conn);
123 xcb_void_cookie_t cookie;
125 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
126 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
128 /* Use the default cursor (left pointer) */
130 i3Font *cursor_font = load_font(conn, "cursor");
131 xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id,
132 XCB_CURSOR_LEFT_PTR, XCB_CURSOR_LEFT_PTR + 1,
133 0, 0, 0, 65535, 65535, 65535);
136 cookie = xcb_create_window_checked(conn,
138 result, /* the window id */
139 root, /* parent == root */
140 dims.x, dims.y, dims.width, dims.height, /* dimensions */
141 0, /* border = 0, we draw our own */
143 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
146 check_error(conn, cookie, "Could not create window");
149 cookie = xcb_change_window_attributes_checked(conn, result, XCB_CW_CURSOR, &cursor_id);
150 check_error(conn, cookie, "Could not change window attributes");
153 /* Map the window (= make it visible) */
154 xcb_map_window(conn, result);
160 * Changes a single value in the graphic context (so one doesn’t have to define an array of values)
163 void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
164 xcb_change_gc(conn, gc, mask, &value);
168 * Draws a line from x,y to to_x,to_y using the given color
171 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
172 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
173 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
174 xcb_point_t points[] = {{x, y}, {to_x, to_y}};
175 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
179 * Draws a rectangle from x,y with width,height using the given color
182 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
183 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
184 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
185 xcb_rectangle_t rect = {x, y, width, height};
186 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);