/*
* vim:ts=4:sw=4:expandtab
*
* © 2010-2014 Michael Stapelberg
*
* See LICENSE for licensing information
*
*/
#include <stdbool.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <xcb/xcb.h>
#include <ev.h>
#include <cairo.h>
#include <cairo/cairo-xcb.h>
#include "i3lock.h"
#include "xcb.h"
#include "unlock_indicator.h"
#include "xinerama.h"
#define BUTTON_RADIUS 90
#define BUTTON_SPACE (BUTTON_RADIUS + 5)
#define BUTTON_CENTER (BUTTON_RADIUS + 5)
#define BUTTON_DIAMETER (2 * BUTTON_SPACE)
/*******************************************************************************
* Variables defined in i3lock.c.
******************************************************************************/
extern bool debug_mode;
/* 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 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];
/* Whether the failed attempts should be displayed. */
extern bool show_failed_attempts;
/* Number of failed unlock attempts. */
extern int failed_attempts;
/*******************************************************************************
* Variables defined in xcb.c.
******************************************************************************/
/* The root screen, to determine the DPI. */
extern xcb_screen_t *screen;
/*******************************************************************************
* Local variables.
******************************************************************************/
/* 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;
/*
* Returns the scaling factor of the current screen. E.g., on a 227 DPI MacBook
* Pro 13" Retina screen, the scaling factor is 227/96 = 2.36.
*
*/
static double scaling_factor(void) {
const int dpi = (double)screen->height_in_pixels * 25.4 /
(double)screen->height_in_millimeters;
return (dpi / 96.0);
}
/*
* 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;
int button_diameter_physical = ceil(scaling_factor() * BUTTON_DIAMETER);
DEBUG("scaling_factor is %.f, physical diameter is %d px\n",
scaling_factor(), button_diameter_physical);
if (!vistype)
vistype = get_root_visual_type(screen);
bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
/* Initialize cairo: Create one in-memory surface to render the unlock
* indicator on, create one XCB surface to actually draw (one or more,
* depending on the amount of screens) unlock indicators on. */
cairo_surface_t *output = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, button_diameter_physical, button_diameter_physical);
cairo_t *ctx = cairo_create(output);
cairo_surface_t *xcb_output = cairo_xcb_surface_create(conn, bg_pixmap, vistype, resolution[0], resolution[1]);
cairo_t *xcb_ctx = cairo_create(xcb_output);
if (img) {
if (!tile) {
cairo_set_source_surface(xcb_ctx, img, 0, 0);
cairo_paint(xcb_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(xcb_ctx, pattern);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
cairo_fill(xcb_ctx);
cairo_pattern_destroy(pattern);
}
} else {
char strgroups[3][3] = {{color[0], color[1], '\0'},
{color[2], color[3], '\0'},
{color[4], color[5], '\0'}};
uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
(strtol(strgroups[1], NULL, 16)),
(strtol(strgroups[2], NULL, 16))};
cairo_set_source_rgb(xcb_ctx, rgb16[0] / 255.0, rgb16[1] / 255.0, rgb16[2] / 255.0);
cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
cairo_fill(xcb_ctx);
}
if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
cairo_scale(ctx, scaling_factor(), scaling_factor());
/* Draw a (centered) circle with transparent background. */
cairo_set_line_width(ctx, 10.0);
cairo_arc(ctx,
BUTTON_CENTER /* x */,
BUTTON_CENTER /* 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);
switch (pam_state) {
case STATE_PAM_VERIFY:
cairo_set_source_rgb(ctx, 51.0 / 255, 0, 250.0 / 255);
break;
case STATE_PAM_WRONG:
cairo_set_source_rgb(ctx, 125.0 / 255, 51.0 / 255, 0);
break;
case STATE_PAM_IDLE:
cairo_set_source_rgb(ctx, 51.0 / 255, 125.0 / 255, 0);
break;
}
cairo_stroke(ctx);
/* Draw an inner seperator line. */
cairo_set_source_rgb(ctx, 0, 0, 0);
cairo_set_line_width(ctx, 2.0);
cairo_arc(ctx,
BUTTON_CENTER /* x */,
BUTTON_CENTER /* 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;
/* We don't want to show more than a 3-digit number. */
char buf[4];
cairo_set_source_rgb(ctx, 0, 0, 0);
cairo_set_font_size(ctx, 28.0);
switch (pam_state) {
case STATE_PAM_VERIFY:
text = "verifying…";
break;
case STATE_PAM_WRONG:
text = "wrong!";
break;
default:
if (show_failed_attempts && failed_attempts > 0) {
if (failed_attempts > 999) {
text = "> 999";
} else {
snprintf(buf, sizeof(buf), "%d", failed_attempts);
text = buf;
}
cairo_set_source_rgb(ctx, 1, 0, 0);
cairo_set_font_size(ctx, 32.0);
}
break;
}
if (text) {
cairo_text_extents_t extents;
double x, y;
cairo_text_extents(ctx, text, &extents);
x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
y = BUTTON_CENTER - ((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,
BUTTON_CENTER /* x */,
BUTTON_CENTER /* 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. */
cairo_set_source_rgb(ctx, 51.0 / 255, 219.0 / 255, 0);
} else {
/* For backspace, we use red. */
cairo_set_source_rgb(ctx, 219.0 / 255, 51.0 / 255, 0);
}
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,
BUTTON_CENTER /* x */,
BUTTON_CENTER /* y */,
BUTTON_RADIUS /* radius */,
highlight_start /* start */,
highlight_start + (M_PI / 128.0) /* end */);
cairo_stroke(ctx);
cairo_arc(ctx,
BUTTON_CENTER /* x */,
BUTTON_CENTER /* 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);
}
}
if (xr_screens > 0) {
/* Composite the unlock indicator in the middle of each screen. */
for (int screen = 0; screen < xr_screens; screen++) {
int x = (xr_resolutions[screen].x + ((xr_resolutions[screen].width / 2) - (button_diameter_physical / 2)));
int y = (xr_resolutions[screen].y + ((xr_resolutions[screen].height / 2) - (button_diameter_physical / 2)));
cairo_set_source_surface(xcb_ctx, output, x, y);
cairo_rectangle(xcb_ctx, x, y, button_diameter_physical, button_diameter_physical);
cairo_fill(xcb_ctx);
}
} else {
/* We have no information about the screen sizes/positions, so we just
* place the unlock indicator in the middle of the X root window and
* hope for the best. */
int x = (last_resolution[0] / 2) - (button_diameter_physical / 2);
int y = (last_resolution[1] / 2) - (button_diameter_physical / 2);
cairo_set_source_surface(xcb_ctx, output, x, y);
cairo_rectangle(xcb_ctx, x, y, button_diameter_physical, button_diameter_physical);
cairo_fill(xcb_ctx);
}
cairo_surface_destroy(xcb_output);
cairo_surface_destroy(output);
cairo_destroy(ctx);
cairo_destroy(xcb_ctx);
return bg_pixmap;
}
/*
* Calls draw_image on a new pixmap and swaps that with the current pixmap
*
*/
void redraw_screen(void) {
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, last_resolution[0], last_resolution[1]);
xcb_free_pixmap(conn, bg_pixmap);
xcb_flush(conn);
}
/*
* Hides the unlock indicator completely when there is no content in the
* password buffer.
*
*/
void clear_indicator(void) {
if (input_position == 0) {
unlock_state = STATE_STARTED;
} else
unlock_state = STATE_KEY_PRESSED;
redraw_screen();
}