281 lines
10 KiB
C
281 lines
10 KiB
C
/*
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* vim:ts=8:expandtab
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*
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* i3 - an improved dynamic tiling window manager
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*
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* © 2009 Michael Stapelberg and contributors
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*
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* See file LICENSE for license information.
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*
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* xcb.c: Helper functions for easier usage of XCB
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*
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_keysyms.h>
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#include "util.h"
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#include "xcb.h"
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TAILQ_HEAD(cached_fonts_head, Font) cached_fonts = TAILQ_HEAD_INITIALIZER(cached_fonts);
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SLIST_HEAD(colorpixel_head, Colorpixel) colorpixels;
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unsigned int xcb_numlock_mask;
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/*
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* Loads a font for usage, getting its height. This function is used very often, so it
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* maintains a cache.
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*
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*/
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i3Font *load_font(xcb_connection_t *conn, const char *pattern) {
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/* Check if we got the font cached */
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i3Font *font;
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TAILQ_FOREACH(font, &cached_fonts, fonts)
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if (strcmp(font->pattern, pattern) == 0)
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return font;
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i3Font *new = smalloc(sizeof(i3Font));
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xcb_void_cookie_t font_cookie;
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xcb_list_fonts_with_info_cookie_t info_cookie;
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/* Send all our requests first */
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new->id = xcb_generate_id(conn);
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font_cookie = xcb_open_font_checked(conn, new->id, strlen(pattern), pattern);
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info_cookie = xcb_list_fonts_with_info(conn, 1, strlen(pattern), pattern);
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check_error(conn, font_cookie, "Could not open font");
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/* Get information (height/name) for this font */
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xcb_list_fonts_with_info_reply_t *reply = xcb_list_fonts_with_info_reply(conn, info_cookie, NULL);
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exit_if_null(reply, "Could not load font \"%s\"\n", pattern);
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if (asprintf(&(new->name), "%.*s", xcb_list_fonts_with_info_name_length(reply),
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xcb_list_fonts_with_info_name(reply)) == -1)
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die("asprintf() failed\n");
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new->pattern = sstrdup(pattern);
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new->height = reply->font_ascent + reply->font_descent;
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/* Insert into cache */
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TAILQ_INSERT_TAIL(&cached_fonts, new, fonts);
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return new;
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}
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/*
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* Returns the colorpixel to use for the given hex color (think of HTML).
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*
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* The hex_color has to start with #, for example #FF00FF.
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*
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* NOTE that get_colorpixel() does _NOT_ check the given color code for validity.
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* This has to be done by the caller.
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*
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*/
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uint32_t get_colorpixel(xcb_connection_t *conn, char *hex) {
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/* Lookup this colorpixel in the cache */
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struct Colorpixel *colorpixel;
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SLIST_FOREACH(colorpixel, &(colorpixels), colorpixels)
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if (strcmp(colorpixel->hex, hex) == 0)
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return colorpixel->pixel;
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#define RGB_8_TO_16(i) (65535 * ((i) & 0xFF) / 255)
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char strgroups[3][3] = {{hex[1], hex[2], '\0'},
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{hex[3], hex[4], '\0'},
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{hex[5], hex[6], '\0'}};
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int rgb16[3] = {RGB_8_TO_16(strtol(strgroups[0], NULL, 16)),
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RGB_8_TO_16(strtol(strgroups[1], NULL, 16)),
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RGB_8_TO_16(strtol(strgroups[2], NULL, 16))};
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xcb_screen_t *root_screen = xcb_setup_roots_iterator(xcb_get_setup(conn)).data;
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xcb_alloc_color_reply_t *reply;
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reply = xcb_alloc_color_reply(conn, xcb_alloc_color(conn, root_screen->default_colormap,
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rgb16[0], rgb16[1], rgb16[2]), NULL);
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if (!reply) {
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LOG("Could not allocate color\n");
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exit(1);
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}
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uint32_t pixel = reply->pixel;
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free(reply);
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/* Store the result in the cache */
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struct Colorpixel *cache_pixel = scalloc(sizeof(struct Colorpixel));
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cache_pixel->hex = sstrdup(hex);
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cache_pixel->pixel = pixel;
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SLIST_INSERT_HEAD(&(colorpixels), cache_pixel, colorpixels);
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return pixel;
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}
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/*
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* Convenience wrapper around xcb_create_window which takes care of depth, generating an ID and checking
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* for errors.
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*
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*/
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xcb_window_t create_window(xcb_connection_t *conn, Rect dims, uint16_t window_class, int cursor,
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uint32_t mask, uint32_t *values) {
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xcb_window_t root = xcb_setup_roots_iterator(xcb_get_setup(conn)).data->root;
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xcb_window_t result = xcb_generate_id(conn);
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xcb_cursor_t cursor_id = xcb_generate_id(conn);
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/* If the window class is XCB_WINDOW_CLASS_INPUT_ONLY, depth has to be 0 */
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uint16_t depth = (window_class == XCB_WINDOW_CLASS_INPUT_ONLY ? 0 : XCB_COPY_FROM_PARENT);
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/* Use the default cursor (left pointer) */
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if (cursor > -1) {
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i3Font *cursor_font = load_font(conn, "cursor");
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xcb_create_glyph_cursor(conn, cursor_id, cursor_font->id, cursor_font->id,
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XCB_CURSOR_LEFT_PTR, XCB_CURSOR_LEFT_PTR + 1,
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0, 0, 0, 65535, 65535, 65535);
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}
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xcb_create_window(conn,
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depth,
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result, /* the window id */
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root, /* parent == root */
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dims.x, dims.y, dims.width, dims.height, /* dimensions */
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0, /* border = 0, we draw our own */
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window_class,
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XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
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mask,
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values);
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if (cursor > -1)
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xcb_change_window_attributes(conn, result, XCB_CW_CURSOR, &cursor_id);
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/* Map the window (= make it visible) */
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xcb_map_window(conn, result);
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return result;
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}
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/*
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* Changes a single value in the graphic context (so one doesn’t have to define an array of values)
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*
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*/
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void xcb_change_gc_single(xcb_connection_t *conn, xcb_gcontext_t gc, uint32_t mask, uint32_t value) {
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xcb_change_gc(conn, gc, mask, &value);
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}
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/*
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* Draws a line from x,y to to_x,to_y using the given color
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*
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*/
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void xcb_draw_line(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
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uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t to_x, uint32_t to_y) {
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xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
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xcb_point_t points[] = {{x, y}, {to_x, to_y}};
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xcb_poly_line(conn, XCB_COORD_MODE_ORIGIN, drawable, gc, 2, points);
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}
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/*
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* Draws a rectangle from x,y with width,height using the given color
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*
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*/
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void xcb_draw_rect(xcb_connection_t *conn, xcb_drawable_t drawable, xcb_gcontext_t gc,
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uint32_t colorpixel, uint32_t x, uint32_t y, uint32_t width, uint32_t height) {
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xcb_change_gc_single(conn, gc, XCB_GC_FOREGROUND, colorpixel);
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xcb_rectangle_t rect = {x, y, width, height};
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xcb_poly_fill_rectangle(conn, drawable, gc, 1, &rect);
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}
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/*
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* Generates a configure_notify event and sends it to the given window
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* Applications need this to think they’ve configured themselves correctly.
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* The truth is, however, that we will manage them.
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*
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*/
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void fake_configure_notify(xcb_connection_t *conn, Rect r, xcb_window_t window) {
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xcb_configure_notify_event_t generated_event;
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generated_event.event = window;
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generated_event.window = window;
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generated_event.response_type = XCB_CONFIGURE_NOTIFY;
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generated_event.x = r.x;
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generated_event.y = r.y;
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generated_event.width = r.width;
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generated_event.height = r.height;
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generated_event.border_width = 0;
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generated_event.above_sibling = XCB_NONE;
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generated_event.override_redirect = false;
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xcb_send_event(conn, false, window, XCB_EVENT_MASK_STRUCTURE_NOTIFY, (char*)&generated_event);
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xcb_flush(conn);
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LOG("Told the client it is at %dx%d with %dx%d\n", r.x, r.y, r.width, r.height);
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}
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/*
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* Generates a configure_notify_event with absolute coordinates (relative to the X root
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* window, not to the client’s frame) for the given client.
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*
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*/
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void fake_absolute_configure_notify(xcb_connection_t *conn, Client *client) {
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Rect absolute;
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absolute.x = client->rect.x;
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absolute.y = client->rect.y;
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absolute.width = client->rect.width - (2 * client->child_rect.x);
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absolute.height = client->rect.height - client->child_rect.y - 1;
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fake_configure_notify(conn, absolute, client->child);
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}
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/*
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* Finds out which modifier mask is the one for numlock, as the user may change this.
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*
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*/
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void xcb_get_numlock_mask(xcb_connection_t *conn) {
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xcb_key_symbols_t *keysyms;
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xcb_get_modifier_mapping_cookie_t cookie;
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xcb_get_modifier_mapping_reply_t *reply;
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xcb_keycode_t *modmap;
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int mask, i;
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const int masks[8] = { XCB_MOD_MASK_SHIFT,
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XCB_MOD_MASK_LOCK,
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XCB_MOD_MASK_CONTROL,
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XCB_MOD_MASK_1,
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XCB_MOD_MASK_2,
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XCB_MOD_MASK_3,
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XCB_MOD_MASK_4,
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XCB_MOD_MASK_5 };
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/* Request the modifier map */
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cookie = xcb_get_modifier_mapping_unchecked(conn);
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/* Get the keysymbols */
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keysyms = xcb_key_symbols_alloc(conn);
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if ((reply = xcb_get_modifier_mapping_reply(conn, cookie, NULL)) == NULL) {
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xcb_key_symbols_free(keysyms);
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return;
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}
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modmap = xcb_get_modifier_mapping_keycodes(reply);
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/* Get the keycode for numlock */
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#ifdef OLD_XCB_KEYSYMS_API
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xcb_keycode_t numlock = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
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#else
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/* For now, we only use the first keysymbol. */
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xcb_keycode_t *numlock_syms = xcb_key_symbols_get_keycode(keysyms, XCB_NUM_LOCK);
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xcb_keycode_t numlock = *numlock_syms;
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#endif
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/* Check all modifiers (Mod1-Mod5, Shift, Control, Lock) */
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for (mask = 0; mask < sizeof(masks); mask++)
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for (i = 0; i < reply->keycodes_per_modifier; i++)
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if (modmap[(mask * reply->keycodes_per_modifier) + i] == numlock)
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xcb_numlock_mask = masks[mask];
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xcb_key_symbols_free(keysyms);
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free(reply);
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}
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