/* * 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 "util.h" #include "xcb.h" TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts); SLIST_HEAD(colorpixel_head, Colorpixel) colorpixels; /* * 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) { /* Lookup this colorpixel in the cache */ struct Colorpixel *colorpixel; SLIST_FOREACH(colorpixel, &(colorpixels), colorpixels) if (strcmp(colorpixel->hex, hex) == 0) return colorpixel->pixel; #define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255) char strgroups[3][3] = {{hex[1], hex[2], '\0'}, {hex[3], hex[4], '\0'}, {hex[5], hex[6], '\0'}}; int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)), RGB_8_TO_16(strtol(strgroups[1], NULL, 16)), RGB_8_TO_16(strtol(strgroups[2], NULL, 16))}; xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data; xcb_alloc_color_reply_t *reply; reply = xcb_alloc_color_reply(conn, xcb_alloc_color(conn, root_screen->default_colormap, rgb16[0], rgb16[1], rgb16[2]), NULL); if (!reply) { printf("Could not allocate color\n"); exit(1); } uint32_t pixel = reply->pixel; free(reply); /* Store the result in the cache */ struct Colorpixel *cache_pixel = scalloc(sizeof(struct Colorpixel)); cache_pixel->hex = sstrdup(hex); cache_pixel->pixel = pixel; SLIST_INSERT_HEAD(&(colorpixels), cache_pixel, colorpixels); return pixel; } /* * 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, 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) */ 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); }