/*
* vim:ts=4:sw=4:expandtab
*
* © 2010-2012 Michael Stapelberg
*
* See LICENSE for licensing information
*
*/
#include <stdbool.h>
#include <stdlib.h>
#include <math.h>
#include <xcb/xcb.h>
#include <xcb/xcb_keysyms.h>
#include <ev.h>
#ifndef NOLIBCAIRO
#include <cairo.h>
#include <cairo/cairo-xcb.h>
#endif
#include "xcb.h"
#include "unlock_indicator.h"
#define BUTTON_RADIUS 90
#define BUTTON_SPACE (BUTTON_RADIUS + 5)
#define BUTTON_CENTER (BUTTON_RADIUS + 5)
#define BUTTON_DIAMETER (5 * BUTTON_SPACE)
/*******************************************************************************
* Variables defined in i3lock.c.
******************************************************************************/
/* The current position in the input buffer. Useful to determine if any
* characters of the password have already been entered or not. */
int input_position;
/* The ev main loop. */
struct ev_loop *main_loop;
/* The lock window. */
extern xcb_window_t win;
/* The current resolution of the X11 root window. */
extern uint32_t last_resolution[2];
/* Whether the unlock indicator is enabled (defaults to true). */
extern bool unlock_indicator;
/* A Cairo surface containing the specified image (-i), if any. */
extern cairo_surface_t *img;
/* Whether the image should be tiled. */
extern bool tile;
/* The background color to use (in hex). */
extern char color[7];
/*******************************************************************************
* Local variables.
******************************************************************************/
static struct ev_timer *clear_indicator_timeout;
/* Cache the screen’s visual, necessary for creating a Cairo context. */
static xcb_visualtype_t *vistype;
/* Maintain the current unlock/PAM state to draw the appropriate unlock
* indicator. */
unlock_state_t unlock_state;
pam_state_t pam_state;
/*
* Draws global image with fill color onto a pixmap with the given
* resolution and returns it.
*
*/
xcb_pixmap_t draw_image(uint32_t *resolution) {
xcb_pixmap_t bg_pixmap = XCB_NONE;
#ifndef NOLIBCAIRO
if (!vistype)
vistype = get_root_visual_type(screen);
bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
/* Initialize cairo */
cairo_surface_t *output;
output = cairo_xcb_surface_create(conn, bg_pixmap, vistype,
resolution[0], resolution[1]);
cairo_t *ctx = cairo_create(output);
if (img) {
if (!tile) {
cairo_set_source_surface(ctx, img, 0, 0);
cairo_paint(ctx);
} else {
/* create a pattern and fill a rectangle as big as the screen */
cairo_pattern_t *pattern;
pattern = cairo_pattern_create_for_surface(img);
cairo_set_source(ctx, pattern);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
cairo_rectangle(ctx, 0, 0, resolution[0], resolution[1]);
cairo_fill(ctx);
cairo_pattern_destroy(pattern);
}
}
if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
cairo_pattern_t *outer_pat = NULL;
outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
switch (pam_state) {
case STATE_PAM_VERIFY:
cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 0, 250.0/255);
cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 0, 250.0/255);
break;
case STATE_PAM_WRONG:
cairo_pattern_add_color_stop_rgb(outer_pat, 0, 255.0/250, 139.0/255, 0);
cairo_pattern_add_color_stop_rgb(outer_pat, 1, 125.0/255, 51.0/255, 0);
break;
case STATE_PAM_IDLE:
cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 125.0/255, 0);
cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 125.0/255, 0);
break;
}
/* Draw a (centered) circle with transparent background. */
cairo_set_line_width(ctx, 10.0);
cairo_arc(ctx,
(resolution[0] / 2) /* x */,
(resolution[1] / 2) /* y */,
BUTTON_RADIUS /* radius */,
0 /* start */,
2 * M_PI /* end */);
/* Use the appropriate color for the different PAM states
* (currently verifying, wrong password, or default) */
switch (pam_state) {
case STATE_PAM_VERIFY:
cairo_set_source_rgba(ctx, 0, 114.0/255, 255.0/255, 0.75);
break;
case STATE_PAM_WRONG:
cairo_set_source_rgba(ctx, 250.0/255, 0, 0, 0.75);
break;
default:
cairo_set_source_rgba(ctx, 0, 0, 0, 0.75);
break;
}
cairo_fill_preserve(ctx);
cairo_set_source(ctx, outer_pat);
cairo_stroke(ctx);
cairo_pattern_destroy(outer_pat);
/* Draw an inner seperator line. */
cairo_set_source_rgb(ctx, 0, 0, 0);
cairo_set_line_width(ctx, 2.0);
cairo_arc(ctx,
(resolution[0] / 2) /* x */,
(resolution[1] / 2) /* y */,
BUTTON_RADIUS - 5 /* radius */,
0,
2 * M_PI);
cairo_stroke(ctx);
cairo_set_line_width(ctx, 10.0);
/* Display a (centered) text of the current PAM state. */
char *text = NULL;
switch (pam_state) {
case STATE_PAM_VERIFY:
text = "verifying…";
break;
case STATE_PAM_WRONG:
text = "wrong!";
break;
default:
break;
}
if (text) {
cairo_text_extents_t extents;
double x, y;
cairo_set_source_rgb(ctx, 0, 0, 0);
cairo_set_font_size(ctx, 28.0);
cairo_text_extents(ctx, text, &extents);
x = (resolution[0] / 2.0) - ((extents.width / 2) + extents.x_bearing);
y = (resolution[1] / 2.0) - ((extents.height / 2) + extents.y_bearing);
cairo_move_to(ctx, x, y);
cairo_show_text(ctx, text);
cairo_close_path(ctx);
}
/* After the user pressed any valid key or the backspace key, we
* highlight a random part of the unlock indicator to confirm this
* keypress. */
if (unlock_state == STATE_KEY_ACTIVE ||
unlock_state == STATE_BACKSPACE_ACTIVE) {
cairo_new_sub_path(ctx);
double highlight_start = (rand() % (int)(2 * M_PI * 100)) / 100.0;
cairo_arc(ctx, resolution[0] / 2 /* x */, resolution[1] / 2 /* y */,
BUTTON_RADIUS /* radius */, highlight_start,
highlight_start + (M_PI / 3.0));
if (unlock_state == STATE_KEY_ACTIVE) {
/* For normal keys, we use a lighter green. */
outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 219.0/255, 0);
cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 219.0/255, 0);
} else {
/* For backspace, we use red. */
outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
cairo_pattern_add_color_stop_rgb(outer_pat, 0, 219.0/255, 139.0/255, 0);
cairo_pattern_add_color_stop_rgb(outer_pat, 1, 219.0/255, 51.0/255, 0);
}
cairo_set_source(ctx, outer_pat);
cairo_stroke(ctx);
/* Draw two little separators for the highlighted part of the
* unlock indicator. */
cairo_set_source_rgb(ctx, 0, 0, 0);
cairo_arc(ctx,
(resolution[0] / 2) /* x */,
(resolution[1] / 2) /* y */,
BUTTON_RADIUS /* radius */,
highlight_start /* start */,
highlight_start + (M_PI / 128.0) /* end */);
cairo_stroke(ctx);
cairo_arc(ctx,
(resolution[0] / 2) /* x */,
(resolution[1] / 2) /* y */,
BUTTON_RADIUS /* radius */,
highlight_start + (M_PI / 3.0) /* start */,
(highlight_start + (M_PI / 3.0)) + (M_PI / 128.0) /* end */);
cairo_stroke(ctx);
cairo_pattern_destroy(outer_pat);
}
}
cairo_surface_destroy(output);
cairo_destroy(ctx);
#endif
return bg_pixmap;
}
/*
* Calls draw_image on a new pixmap and swaps that with the current pixmap
*
*/
void redraw_screen() {
xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
xcb_change_window_attributes(conn, win, XCB_CW_BACK_PIXMAP, (uint32_t[1]){ bg_pixmap });
/* XXX: Possible optimization: Only update the area in the middle of the
* screen instead of the whole screen. */
xcb_clear_area(conn, 0, win, 0, 0, screen->width_in_pixels, screen->height_in_pixels);
xcb_free_pixmap(conn, bg_pixmap);
xcb_flush(conn);
}
/*
* Hides the unlock indicator completely when there is no content in the
* password buffer.
*
*/
static void clear_indicator(EV_P_ ev_timer *w, int revents) {
if (input_position == 0) {
unlock_state = STATE_STARTED;
} else unlock_state = STATE_KEY_PRESSED;
redraw_screen();
ev_timer_stop(main_loop, clear_indicator_timeout);
free(clear_indicator_timeout);
clear_indicator_timeout = NULL;
}
/*
* (Re-)starts the clear_indicator timeout. Called after pressing backspace or
* after an unsuccessful authentication attempt.
*
*/
void start_clear_indicator_timeout() {
if (clear_indicator_timeout) {
ev_timer_stop(main_loop, clear_indicator_timeout);
ev_timer_set(clear_indicator_timeout, 1.0, 0.);
ev_timer_start(main_loop, clear_indicator_timeout);
} else {
/* When there is no memory, we just don’t have a timeout. We cannot
* exit() here, since that would effectively unlock the screen. */
if (!(clear_indicator_timeout = calloc(sizeof(struct ev_timer), 1)))
return;
ev_timer_init(clear_indicator_timeout, clear_indicator, 1.0, 0.);
ev_timer_start(main_loop, clear_indicator_timeout);
}
}
/*
* Stops the clear_indicator timeout.
*
*/
void stop_clear_indicator_timeout() {
if (clear_indicator_timeout) {
ev_timer_stop(main_loop, clear_indicator_timeout);
free(clear_indicator_timeout);
clear_indicator_timeout = NULL;
}
}