i3
|
00001 /* 00002 * vim:ts=4:sw=4:expandtab 00003 * 00004 * i3 - an improved dynamic tiling window manager 00005 * 00006 * © 2009-2010 Michael Stapelberg and contributors 00007 * 00008 * See file LICENSE for license information. 00009 * 00010 * xcb.c: Helper functions for easier usage of XCB 00011 * 00012 */ 00013 00014 #include "all.h" 00015 00016 TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts); 00017 unsigned int xcb_numlock_mask; 00018 00019 /* 00020 * Loads a font for usage, also getting its height. If fallback is true, 00021 * i3 loads 'fixed' or '-misc-*' if the font cannot be found instead of 00022 * exiting. 00023 * 00024 */ 00025 i3Font load_font(const char *pattern, bool fallback) { 00026 i3Font new; 00027 xcb_void_cookie_t font_cookie; 00028 xcb_list_fonts_with_info_cookie_t info_cookie; 00029 00030 /* Send all our requests first */ 00031 new.id = xcb_generate_id(conn); 00032 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern); 00033 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern); 00034 00035 /* Check for errors. If errors, fall back to default font. */ 00036 xcb_generic_error_t *error = xcb_request_check(conn, font_cookie); 00037 00038 /* If we fail to open font, fall back to 'fixed'. If opening 'fixed' fails fall back to '-misc-*' */ 00039 if (error != NULL) { 00040 ELOG("Could not open font %s (X error %d). Reverting to backup font.\n", pattern, error->error_code); 00041 pattern = "fixed"; 00042 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern); 00043 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern); 00044 00045 /* Check if we managed to open 'fixed' */ 00046 xcb_generic_error_t *error = xcb_request_check(conn, font_cookie); 00047 00048 /* Fall back to '-misc-*' if opening 'fixed' fails. */ 00049 if (error != NULL) { 00050 ELOG("Could not open fallback font '%s', trying with '-misc-*'\n",pattern); 00051 pattern = "-misc-*"; 00052 font_cookie = xcb_open_font_checked(conn, new.id, strlen(pattern), pattern); 00053 info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern); 00054 00055 check_error(conn, font_cookie, "Could open neither requested font nor fallback (fixed or -misc-*"); 00056 } 00057 } 00058 00059 /* Get information (height/name) for this font */ 00060 xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL); 00061 exit_if_null(reply, "Could not load font \"%s\"\n", pattern); 00062 00063 new.height = reply->font_ascent + reply->font_descent; 00064 00065 free(reply); 00066 00067 return new; 00068 } 00069 00070 /* 00071 * Returns the colorpixel to use for the given hex color (think of HTML). 00072 * 00073 * The hex_color has to start with #, for example #FF00FF. 00074 * 00075 * NOTE that get_colorpixel() does _NOT_ check the given color code for validity. 00076 * This has to be done by the caller. 00077 * 00078 */ 00079 uint32_t get_colorpixel(char *hex) { 00080 char strgroups[3][3] = {{hex[1], hex[2], '\0'}, 00081 {hex[3], hex[4], '\0'}, 00082 {hex[5], hex[6], '\0'}}; 00083 uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)), 00084 (strtol(strgroups[1], NULL, 16)), 00085 (strtol(strgroups[2], NULL, 16))}; 00086 00087 return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2]; 00088 } 00089 00090 /* 00091 * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking 00092 * for errors. 00093 * 00094 */ 00095 xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, 00096 enum xcursor_cursor_t cursor, bool map, uint32_t mask, uint32_t *values) { 00097 xcb_window_t result = xcb_generate_id(conn); 00098 00099 /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */ 00100 uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT); 00101 00102 xcb_create_window(conn, 00103 depth, 00104 result, /* the window id */ 00105 root, /* parent == root */ 00106 dims.x, dims.y, dims.width, dims.height, /* dimensions */ 00107 0, /* border = 0, we draw our own */ 00108 window_class, 00109 XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */ 00110 mask, 00111 values); 00112 00113 /* Set the cursor */ 00114 if (xcursor_supported) { 00115 mask = XCB_CW_CURSOR; 00116 values[0] = xcursor_get_cursor(cursor); 00117 xcb_change_window_attributes(conn, result, mask, values); 00118 } else { 00119 xcb_cursor_t cursor_id = xcb_generate_id(conn); 00120 i3Font cursor_font = load_font("cursor", false); 00121 int xcb_cursor = xcursor_get_xcb_cursor(cursor); 00122 xcb_create_glyph_cursor(conn, cursor_id, cursor_font.id, cursor_font.id, 00123 xcb_cursor, xcb_cursor + 1, 0, 0, 0, 65535, 65535, 65535); 00124 xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id); 00125 xcb_free_cursor(conn, cursor_id); 00126 } 00127 00128 /* Map the window (= make it visible) */ 00129 if (map) 00130 xcb_map_window(conn, result); 00131 00132 return result; 00133 } 00134 00135 /* 00136 * Changes a single value in the graphic context (so one doesn’t have to define an array of values) 00137 * 00138 */ 00139 void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) { 00140 xcb_change_gc(conn, gc, mask, &value); 00141 } 00142 00143 /* 00144 * Draws a line from x,y to to_x,to_y using the given color 00145 * 00146 */ 00147 void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc, 00148 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) { 00149 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel); 00150 xcb_point_t points[] = {{x, y}, {to_x, to_y}}; 00151 xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points); 00152 } 00153 00154 /* 00155 * Draws a rectangle from x,y with width,height using the given color 00156 * 00157 */ 00158 void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc, 00159 uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) { 00160 xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel); 00161 xcb_rectangle_t rect = {x, y, width, height}; 00162 xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect); 00163 } 00164 00165 /* 00166 * Generates a configure_notify event and sends it to the given window 00167 * Applications need this to think they’ve configured themselves correctly. 00168 * The truth is, however, that we will manage them. 00169 * 00170 */ 00171 void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) { 00172 /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes. 00173 * In order to properly initialize these bytes, we allocate 32 bytes even 00174 * though we only need less for an xcb_configure_notify_event_t */ 00175 void *event = scalloc(32); 00176 xcb_configure_notify_event_t *generated_event = event; 00177 00178 generated_event->event = window; 00179 generated_event->window = window; 00180 generated_event->response_type = XCB_CONFIGURE_NOTIFY; 00181 00182 generated_event->x = r.x; 00183 generated_event->y = r.y; 00184 generated_event->width = r.width; 00185 generated_event->height = r.height; 00186 00187 generated_event->border_width = 0; 00188 generated_event->above_sibling = XCB_NONE; 00189 generated_event->override_redirect = false; 00190 00191 xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)generated_event); 00192 xcb_flush(conn); 00193 00194 free(event); 00195 } 00196 00197 /* 00198 * Generates a configure_notify_event with absolute coordinates (relative to the X root 00199 * window, not to the client’s frame) for the given client. 00200 * 00201 */ 00202 void fake_absolute_configure_notify(Con *con) { 00203 Rect absolute; 00204 if (con->window == NULL) 00205 return; 00206 00207 absolute.x = con->rect.x + con->window_rect.x; 00208 absolute.y = con->rect.y + con->window_rect.y; 00209 absolute.width = con->window_rect.width; 00210 absolute.height = con->window_rect.height; 00211 00212 DLOG("fake rect = (%d, %d, %d, %d)\n", absolute.x, absolute.y, absolute.width, absolute.height); 00213 00214 fake_configure_notify(conn, absolute, con->window->id); 00215 } 00216 00217 /* 00218 * Sends the WM_TAKE_FOCUS ClientMessage to the given window 00219 * 00220 */ 00221 void send_take_focus(xcb_window_t window) { 00222 /* Every X11 event is 32 bytes long. Therefore, XCB will copy 32 bytes. 00223 * In order to properly initialize these bytes, we allocate 32 bytes even 00224 * though we only need less for an xcb_configure_notify_event_t */ 00225 void *event = scalloc(32); 00226 xcb_client_message_event_t *ev = event; 00227 00228 ev->response_type = XCB_CLIENT_MESSAGE; 00229 ev->window = window; 00230 ev->type = A_WM_PROTOCOLS; 00231 ev->format = 32; 00232 ev->data.data32[0] = A_WM_TAKE_FOCUS; 00233 ev->data.data32[1] = XCB_CURRENT_TIME; 00234 00235 DLOG("Sending WM_TAKE_FOCUS to the client\n"); 00236 xcb_send_event(conn, false, window, XCB_EVENT_MASK_NO_EVENT, (char*)ev); 00237 free(event); 00238 } 00239 00240 /* 00241 * Finds out which modifier mask is the one for numlock, as the user may change this. 00242 * 00243 */ 00244 void xcb_get_numlock_mask(xcb_connection_t *conn) { 00245 xcb_key_symbols_t *keysyms; 00246 xcb_get_modifier_mapping_cookie_t cookie; 00247 xcb_get_modifier_mapping_reply_t *reply; 00248 xcb_keycode_t *modmap; 00249 int mask, i; 00250 const int masks[8] = { XCB_MOD_MASK_SHIFT, 00251 XCB_MOD_MASK_LOCK, 00252 XCB_MOD_MASK_CONTROL, 00253 XCB_MOD_MASK_1, 00254 XCB_MOD_MASK_2, 00255 XCB_MOD_MASK_3, 00256 XCB_MOD_MASK_4, 00257 XCB_MOD_MASK_5 }; 00258 00259 /* Request the modifier map */ 00260 cookie = xcb_get_modifier_mapping(conn); 00261 00262 /* Get the keysymbols */ 00263 keysyms = xcb_key_symbols_alloc(conn); 00264 00265 if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) { 00266 xcb_key_symbols_free(keysyms); 00267 return; 00268 } 00269 00270 modmap = xcb_get_modifier_mapping_keycodes(reply); 00271 00272 /* Get the keycode for numlock */ 00273 #ifdef OLD_XCB_KEYSYMS_API 00274 xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK); 00275 #else 00276 /* For now, we only use the first keysymbol. */ 00277 xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK); 00278 if (numlock_syms == NULL) 00279 return; 00280 xcb_keycode_t numlock = *numlock_syms; 00281 free(numlock_syms); 00282 #endif 00283 00284 /* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */ 00285 for (mask = 0; mask < 8; mask++) 00286 for (i = 0; i < reply->keycodes_per_modifier; i++) 00287 if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock) 00288 xcb_numlock_mask = masks[mask]; 00289 00290 xcb_key_symbols_free(keysyms); 00291 free(reply); 00292 } 00293 00294 /* 00295 * Raises the given window (typically client->frame) above all other windows 00296 * 00297 */ 00298 void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) { 00299 uint32_t values[] = { XCB_STACK_MODE_ABOVE }; 00300 xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values); 00301 } 00302 00303 /* 00304 * Query the width of the given text (16-bit characters, UCS) with given real 00305 * length (amount of glyphs) using the given font. 00306 * 00307 */ 00308 int predict_text_width(char *text, int length) { 00309 xcb_query_text_extents_cookie_t cookie; 00310 xcb_query_text_extents_reply_t *reply; 00311 xcb_generic_error_t *error; 00312 int width; 00313 00314 cookie = xcb_query_text_extents(conn, config.font.id, length, (xcb_char2b_t*)text); 00315 if ((reply = xcb_query_text_extents_reply(conn, cookie, &error)) == NULL) { 00316 ELOG("Could not get text extents (X error code %d)\n", 00317 error->error_code); 00318 /* We return the rather safe guess of 7 pixels, because a 00319 * rendering error is better than a crash. Plus, the user will 00320 * see the error in his log. */ 00321 return 7; 00322 } 00323 00324 width = reply->overall_width; 00325 free(reply); 00326 return width; 00327 } 00328 00329 /* 00330 * Configures the given window to have the size/position specified by given rect 00331 * 00332 */ 00333 void xcb_set_window_rect(xcb_connection_t *conn, xcb_window_t window, Rect r) { 00334 xcb_void_cookie_t cookie; 00335 cookie = xcb_configure_window(conn, window, 00336 XCB_CONFIG_WINDOW_X | 00337 XCB_CONFIG_WINDOW_Y | 00338 XCB_CONFIG_WINDOW_WIDTH | 00339 XCB_CONFIG_WINDOW_HEIGHT, 00340 &(r.x)); 00341 /* ignore events which are generated because we configured a window */ 00342 add_ignore_event(cookie.sequence, -1); 00343 } 00344 00345 /* 00346 * Returns true if the given reply contains the given atom. 00347 * 00348 */ 00349 bool xcb_reply_contains_atom(xcb_get_property_reply_t *prop, xcb_atom_t atom) { 00350 if (prop == NULL || xcb_get_property_value_length(prop) == 0) 00351 return false; 00352 00353 xcb_atom_t *atoms; 00354 if ((atoms = xcb_get_property_value(prop)) == NULL) 00355 return false; 00356 00357 for (int i = 0; i < xcb_get_property_value_length(prop) / (prop->format / 8); i++) 00358 if (atoms[i] == atom) 00359 return true; 00360 00361 return false; 00362 00363 }