/*

* vim:ts=4:sw=4:expandtab

*

* © 2010 Michael Stapelberg

*

* See LICENSE for licensing information

*

*/

#include <stdbool.h>

#include <stdlib.h>

#include <stdio.h>

#include <string.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;

/* List of pressed modifiers, or NULL if none are pressed. */

extern char *modifier_string;

/* 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_operator(xcb_ctx, CAIRO_OPERATOR_SOURCE);

cairo_set_source_surface(xcb_ctx, img, 0, 0);

cairo_paint(xcb_ctx);

cairo_set_operator(xcb_ctx, CAIRO_OPERATOR_OVER);

} 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_indicator &&

(unlock_state >= STATE_KEY_PRESSED || pam_state > STATE_PAM_IDLE)) {

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);

}

if (pam_state == STATE_PAM_WRONG && (modifier_string != NULL)) {

cairo_text_extents_t extents;

double x, y;

cairo_set_font_size(ctx, 14.0);

cairo_text_extents(ctx, modifier_string, &extents);

x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);

y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing) + 28.0;

cairo_move_to(ctx, x, y);

cairo_show_text(ctx, modifier_string);

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) {

DEBUG("redraw_screen(unlock_state = %d, pam_state = %d)\n", unlock_state, pam_state);

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();

}