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i3lock-color/xcb.c
martin 402254b575 Flush xcb connection after opening fullscreen window (#74) 
We need to ensure that the window handle is valid, i. e. the window is
actually created and accessible, before returning.

This is necessary because we immediately fork after returning, and the
child process opens its own X11 connection and expects the window handle
to be valid.

Fixes #46
2016-05-25 22:19:17 +02:00

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9.2 KiB
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/*
* vim:ts=4:sw=4:expandtab
*
* © 2010 Michael Stapelberg
*
* xcb.c: contains all functions which use XCB to talk to X11. Mostly wrappers
* around the rather complicated/ugly parts of the XCB API.
*
*/
#include <xcb/xcb.h>
#include <xcb/xcb_image.h>
#include <xcb/xcb_atom.h>
#include <xcb/xcb_aux.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <err.h>
#include "cursors.h"
xcb_connection_t *conn;
xcb_screen_t *screen;
#define curs_invisible_width 8
#define curs_invisible_height 8
static unsigned char curs_invisible_bits[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
#define curs_windows_width 11
#define curs_windows_height 19
static unsigned char curs_windows_bits[] = {
0xfe, 0x07, 0xfc, 0x07, 0xfa, 0x07, 0xf6, 0x07, 0xee, 0x07, 0xde, 0x07,
0xbe, 0x07, 0x7e, 0x07, 0xfe, 0x06, 0xfe, 0x05, 0x3e, 0x00, 0xb6, 0x07,
0x6a, 0x07, 0x6c, 0x07, 0xde, 0x06, 0xdf, 0x06, 0xbf, 0x05, 0xbf, 0x05,
0x7f, 0x06};
#define mask_windows_width 11
#define mask_windows_height 19
static unsigned char mask_windows_bits[] = {
0x01, 0x00, 0x03, 0x00, 0x07, 0x00, 0x0f, 0x00, 0x1f, 0x00, 0x3f, 0x00,
0x7f, 0x00, 0xff, 0x00, 0xff, 0x01, 0xff, 0x03, 0xff, 0x07, 0x7f, 0x00,
0xf7, 0x00, 0xf3, 0x00, 0xe1, 0x01, 0xe0, 0x01, 0xc0, 0x03, 0xc0, 0x03,
0x80, 0x01};
static uint32_t get_colorpixel(char *hex) {
char strgroups[3][3] = {{hex[0], hex[1], '\0'},
{hex[2], hex[3], '\0'},
{hex[4], hex[5], '\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];
}
xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) {
xcb_visualtype_t *visual_type = NULL;
xcb_depth_iterator_t depth_iter;
xcb_visualtype_iterator_t visual_iter;
for (depth_iter = xcb_screen_allowed_depths_iterator(screen);
depth_iter.rem;
xcb_depth_next(&depth_iter)) {
for (visual_iter = xcb_depth_visuals_iterator(depth_iter.data);
visual_iter.rem;
xcb_visualtype_next(&visual_iter)) {
if (screen->root_visual != visual_iter.data->visual_id)
continue;
visual_type = visual_iter.data;
return visual_type;
}
}
return NULL;
}
xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, u_int32_t *resolution, char *color) {
xcb_pixmap_t bg_pixmap = xcb_generate_id(conn);
xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root,
resolution[0], resolution[1]);
/* Generate a Graphics Context and fill the pixmap with background color
* (for images that are smaller than your screen) */
xcb_gcontext_t gc = xcb_generate_id(conn);
uint32_t values[] = {get_colorpixel(color)};
xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values);
xcb_rectangle_t rect = {0, 0, resolution[0], resolution[1]};
xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect);
xcb_free_gc(conn, gc);
return bg_pixmap;
}
xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) {
uint32_t mask = 0;
uint32_t values[3];
xcb_window_t win = xcb_generate_id(conn);
if (pixmap == XCB_NONE) {
mask |= XCB_CW_BACK_PIXEL;
values[0] = get_colorpixel(color);
} else {
mask |= XCB_CW_BACK_PIXMAP;
values[0] = pixmap;
}
mask |= XCB_CW_OVERRIDE_REDIRECT;
values[1] = 1;
mask |= XCB_CW_EVENT_MASK;
values[2] = XCB_EVENT_MASK_EXPOSURE |
XCB_EVENT_MASK_KEY_PRESS |
XCB_EVENT_MASK_KEY_RELEASE |
XCB_EVENT_MASK_VISIBILITY_CHANGE |
XCB_EVENT_MASK_STRUCTURE_NOTIFY;
xcb_create_window(conn,
XCB_COPY_FROM_PARENT,
win, /* the window id */
scr->root, /* parent == root */
0, 0,
scr->width_in_pixels,
scr->height_in_pixels, /* dimensions */
0, /* border = 0, we draw our own */
XCB_WINDOW_CLASS_INPUT_OUTPUT,
XCB_WINDOW_CLASS_COPY_FROM_PARENT, /* copy visual from parent */
mask,
values);
char *name = "i3lock";
xcb_change_property(conn,
XCB_PROP_MODE_REPLACE,
win,
XCB_ATOM_WM_NAME,
XCB_ATOM_STRING,
8,
strlen(name),
name);
/* Map the window (= make it visible) */
xcb_map_window(conn, win);
/* Raise window (put it on top) */
values[0] = XCB_STACK_MODE_ABOVE;
xcb_configure_window(conn, win, XCB_CONFIG_WINDOW_STACK_MODE, values);
/* Ensure that the window is created and set up before returning */
xcb_aux_sync(conn);
return win;
}
/*
* Repeatedly tries to grab pointer and keyboard (up to 1000 times).
*
*/
void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor) {
xcb_grab_pointer_cookie_t pcookie;
xcb_grab_pointer_reply_t *preply;
xcb_grab_keyboard_cookie_t kcookie;
xcb_grab_keyboard_reply_t *kreply;
int tries = 10000;
while (tries-- > 0) {
pcookie = xcb_grab_pointer(
conn,
false, /* get all pointer events specified by the following mask */
screen->root, /* grab the root window */
XCB_NONE, /* which events to let through */
XCB_GRAB_MODE_ASYNC, /* pointer events should continue as normal */
XCB_GRAB_MODE_ASYNC, /* keyboard mode */
XCB_NONE, /* confine_to = in which window should the cursor stay */
cursor, /* we change the cursor to whatever the user wanted */
XCB_CURRENT_TIME);
if ((preply = xcb_grab_pointer_reply(conn, pcookie, NULL)) &&
preply->status == XCB_GRAB_STATUS_SUCCESS) {
free(preply);
break;
}
/* Make this quite a bit slower */
usleep(50);
}
while (tries-- > 0) {
kcookie = xcb_grab_keyboard(
conn,
true, /* report events */
screen->root, /* grab the root window */
XCB_CURRENT_TIME,
XCB_GRAB_MODE_ASYNC, /* process events as normal, do not require sync */
XCB_GRAB_MODE_ASYNC);
if ((kreply = xcb_grab_keyboard_reply(conn, kcookie, NULL)) &&
kreply->status == XCB_GRAB_STATUS_SUCCESS) {
free(kreply);
break;
}
/* Make this quite a bit slower */
usleep(50);
}
if (tries <= 0)
errx(EXIT_FAILURE, "Cannot grab pointer/keyboard");
}
xcb_cursor_t create_cursor(xcb_connection_t *conn, xcb_screen_t *screen, xcb_window_t win, int choice) {
xcb_pixmap_t bitmap;
xcb_pixmap_t mask;
xcb_cursor_t cursor;
unsigned char *curs_bits;
unsigned char *mask_bits;
int curs_w, curs_h;
switch (choice) {
case CURS_NONE:
curs_bits = curs_invisible_bits;
mask_bits = curs_invisible_bits;
curs_w = curs_invisible_width;
curs_h = curs_invisible_height;
break;
case CURS_WIN:
curs_bits = curs_windows_bits;
mask_bits = mask_windows_bits;
curs_w = curs_windows_width;
curs_h = curs_windows_height;
break;
case CURS_DEFAULT:
default:
return XCB_NONE; /* XCB_NONE is xcb's way of saying "don't change the cursor" */
}
bitmap = xcb_create_pixmap_from_bitmap_data(conn,
win,
curs_bits,
curs_w,
curs_h,
1,
screen->white_pixel,
screen->black_pixel,
NULL);
mask = xcb_create_pixmap_from_bitmap_data(conn,
win,
mask_bits,
curs_w,
curs_h,
1,
screen->white_pixel,
screen->black_pixel,
NULL);
cursor = xcb_generate_id(conn);
xcb_create_cursor(conn,
cursor,
bitmap,
mask,
65535, 65535, 65535,
0, 0, 0,
0, 0);
xcb_free_pixmap(conn, bitmap);
xcb_free_pixmap(conn, mask);
return cursor;
}
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