/* * vim:ts=8:expandtab * * i3 - an improved dynamic tiling window manager * * © 2009 Michael Stapelberg and contributors * * See file LICENSE for license information. * * xcb.c: Helper functions for easier usage of XCB * */ #include #include #include #include #include #include #include "i3.h" #include "util.h" #include "xcb.h" TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts); unsigned int xcb_numlock_mask; /* * Loads a font for usage, getting its height. This function is used very often, so it * maintains a cache. * */ i3Font *load_font(xcb_connection_t *conn, const char *pattern) { /* Check if we got the font cached */ i3Font *font; TAILQ_FOREACH(font, &cached_fonts, fonts) if (strcmp(font->pattern, pattern) == 0) return font; i3Font *new = smalloc(sizeof(i3Font)); xcb_void_cookie_t font_cookie; xcb_list_fonts_with_info_cookie_t info_cookie; /* Send all our requests first */ new->id = xcb_generate_id(conn); font_cookie = xcb_open_font_checked(conn, new->id, strlen(pattern), pattern); info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern); check_error(conn, font_cookie, "Could not open font"); /* Get information (height/name) for this font */ xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL); exit_if_null(reply, "Could not load font \"%s\"\n", pattern); if (asprintf(&(new->name), "%.*s", xcb_list_fonts_with_info_name_length(reply), xcb_list_fonts_with_info_name(reply)) == -1) die("asprintf() failed\n"); new->pattern = sstrdup(pattern); new->height = reply->font_ascent + reply->font_descent; /* Insert into cache */ TAILQ_INSERT_TAIL(&cached_fonts, new, fonts); return new; } /* * Returns the colorpixel to use for the given hex color (think of HTML). * * The hex_color has to start with #, for example #FF00FF. * * NOTE that get_colorpixel() does _NOT_ check the given color code for validity. * This has to be done by the caller. * */ uint32_t get_colorpixel(xcb_connection_t *conn, char *hex) { char strgroups[3][3] = {{hex[1], hex[2], '\0'}, {hex[3], hex[4], '\0'}, {hex[5], hex[6], '\0'}}; uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)), (strtol(strgroups[1], NULL, 16)), (strtol(strgroups[2], NULL, 16))}; return (rgb16[0] << 16) + (rgb16[1] << 8) + rgb16[2]; } /* * Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking * for errors. * */ xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, int cursor, bool map, uint32_t mask, uint32_t *values) { xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root; xcb_window_t result = xcb_generate_id(conn); xcb_cursor_t cursor_id = xcb_generate_id(conn); /* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */ uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT); /* Use the default cursor (left pointer) */ if (cursor > -1) { i3Font *cursor_font = load_font(conn, "cursor"); xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id, XCB_CURSOR_LEFT_PTR, XCB_CURSOR_LEFT_PTR + 1, 0, 0, 0, 65535, 65535, 65535); } xcb_create_window(conn, depth, result, /* the window id */ root, /* parent == root */ dims.x, dims.y, dims.width, dims.height, /* dimensions */ 0, /* border = 0, we draw our own */ window_class, XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */ mask, values); if (cursor > -1) xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id); /* Map the window (= make it visible) */ if (map) xcb_map_window(conn, result); return result; } /* * Changes a single value in the graphic context (so one doesn’t have to define an array of values) * */ void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) { xcb_change_gc(conn, gc, mask, &value); } /* * Draws a line from x,y to to_x,to_y using the given color * */ void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc, uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) { xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel); xcb_point_t points[] = {{x, y}, {to_x, to_y}}; xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points); } /* * Draws a rectangle from x,y with width,height using the given color * */ void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc, uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) { xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel); xcb_rectangle_t rect = {x, y, width, height}; xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect); } /* * Generates a configure_notify event and sends it to the given window * Applications need this to think they’ve configured themselves correctly. * The truth is, however, that we will manage them. * */ void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) { xcb_configure_notify_event_t generated_event; generated_event.event = window; generated_event.window = window; generated_event.response_type = XCB_CONFIGURE_NOTIFY; generated_event.x = r.x; generated_event.y = r.y; generated_event.width = r.width; generated_event.height = r.height; generated_event.border_width = 0; generated_event.above_sibling = XCB_NONE; generated_event.override_redirect = false; xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)&generated_event); xcb_flush(conn); } /* * Generates a configure_notify_event with absolute coordinates (relative to the X root * window, not to the client’s frame) for the given client. * */ void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client) { Rect absolute; absolute.x = client->rect.x + client->child_rect.x; absolute.y = client->rect.y + client->child_rect.y; absolute.width = client->child_rect.width; absolute.height = client->child_rect.height; fake_configure_notify(conn, absolute, client->child); } /* * Finds out which modifier mask is the one for numlock, as the user may change this. * */ void xcb_get_numlock_mask(xcb_connection_t *conn) { xcb_key_symbols_t *keysyms; xcb_get_modifier_mapping_cookie_t cookie; xcb_get_modifier_mapping_reply_t *reply; xcb_keycode_t *modmap; int mask, i; const int masks[8] = { XCB_MOD_MASK_SHIFT, XCB_MOD_MASK_LOCK, XCB_MOD_MASK_CONTROL, XCB_MOD_MASK_1, XCB_MOD_MASK_2, XCB_MOD_MASK_3, XCB_MOD_MASK_4, XCB_MOD_MASK_5 }; /* Request the modifier map */ cookie = xcb_get_modifier_mapping_unchecked(conn); /* Get the keysymbols */ keysyms = xcb_key_symbols_alloc(conn); if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) { xcb_key_symbols_free(keysyms); return; } modmap = xcb_get_modifier_mapping_keycodes(reply); /* Get the keycode for numlock */ #ifdef OLD_XCB_KEYSYMS_API xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK); #else /* For now, we only use the first keysymbol. */ xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK); if (numlock_syms == NULL) return; xcb_keycode_t numlock = *numlock_syms; free(numlock_syms); #endif /* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */ for (mask = 0; mask < 8; mask++) for (i = 0; i < reply->keycodes_per_modifier; i++) if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock) xcb_numlock_mask = masks[mask]; xcb_key_symbols_free(keysyms); free(reply); } /* * Raises the given window (typically client->frame) above all other windows * */ void xcb_raise_window(xcb_connection_t *conn, xcb_window_t window) { uint32_t values[] = { XCB_STACK_MODE_ABOVE }; xcb_configure_window(conn, window, XCB_CONFIG_WINDOW_STACK_MODE, values); } /* * * Prepares the given Cached_Pixmap for usage (checks whether the size of the * object this pixmap is related to (e.g. a window) has changed and re-creates * the pixmap if so). * */ void cached_pixmap_prepare(xcb_connection_t *conn, struct Cached_Pixmap *pixmap) { LOG("preparing pixmap\n"); /* If the Rect did not change, the pixmap does not need to be recreated */ if (memcmp(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect)) == 0) return; memcpy(&(pixmap->rect), pixmap->referred_rect, sizeof(Rect)); if (pixmap->id == 0 || pixmap->gc == 0) { LOG("Creating new pixmap...\n"); pixmap->id = xcb_generate_id(conn); pixmap->gc = xcb_generate_id(conn); } else { LOG("Re-creating this pixmap...\n"); xcb_free_gc(conn, pixmap->gc); xcb_free_pixmap(conn, pixmap->id); } xcb_create_pixmap(conn, root_depth, pixmap->id, pixmap->referred_drawable, pixmap->rect.width, pixmap->rect.height); xcb_create_gc(conn, pixmap->gc, pixmap->id, 0, 0); } /* * Returns the xcb_charinfo_t for the given character (specified by row and * column in the lookup table) if existing, otherwise the minimum bounds. * */ static xcb_charinfo_t *get_charinfo(int col, int row, xcb_query_font_reply_t *font_info, xcb_charinfo_t *table, bool dont_fallback) { xcb_charinfo_t *result; /* Bounds checking */ if (row < font_info->min_byte1 || row > font_info->max_byte1 || col < font_info->min_char_or_byte2 || col > font_info->max_char_or_byte2) return NULL; /* If we don’t have a table to lookup the infos per character, return the * minimum bounds */ if (table == NULL) return &font_info->min_bounds; result = &table[((row - font_info->min_byte1) * (font_info->max_char_or_byte2 - font_info->min_char_or_byte2 + 1)) + (col - font_info->min_char_or_byte2)]; /* If the character has an entry in the table, return it */ if (result->character_width != 0 || (result->right_side_bearing | result->left_side_bearing | result->ascent | result->descent) != 0) return result; /* Otherwise, get the default character and return its charinfo */ if (dont_fallback) return NULL; return get_charinfo((font_info->default_char >> 8), (font_info->default_char & 0xFF), font_info, table, true); } /* * Calculate the width of the given text (16-bit characters, UCS) with given * real length (amount of glyphs) using the given font. * */ int predict_text_width(xcb_connection_t *conn, const char *font_pattern, char *text, int length) { xcb_query_font_reply_t *font_info; xcb_charinfo_t *table; xcb_generic_error_t *error; int i, width = 0; i3Font *font = load_font(conn, font_pattern); font_info = xcb_query_font_reply(conn, xcb_query_font(conn, font->id), &error); if (error != NULL) { fprintf(stderr, "ERROR: query font (X error code %d)\n", error->error_code); /* We return the rather safe guess of 7 pixels, because a * rendering error is better than a crash. Plus, the user will * see the error on his stderr. */ return 7; } /* If no per-char info is available for this font, we use the default */ if (xcb_query_font_char_infos_length(font_info) == 0) { LOG("Falling back on default char_width of %d pixels\n", font_info->max_bounds.character_width); return (font_info->max_bounds.character_width * length); } table = xcb_query_font_char_infos(font_info); for (i = 0; i < 2 * length; i += 2) { xcb_charinfo_t *info = get_charinfo(text[i+1], text[i], font_info, table, false); if (info == NULL) continue; width += info->character_width; } free(font_info); return width; }