mirror of https://github.com/i3/i3lock.git
301 lines
10 KiB
C
301 lines
10 KiB
C
/*
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* vim:ts=4:sw=4:expandtab
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*
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* © 2010-2012 Michael Stapelberg
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*
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* See LICENSE for licensing information
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*
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*/
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#include <stdbool.h>
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#include <stdlib.h>
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#include <math.h>
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#include <xcb/xcb.h>
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#include <xcb/xcb_keysyms.h>
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#include <ev.h>
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#ifndef NOLIBCAIRO
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#include <cairo.h>
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#include <cairo/cairo-xcb.h>
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#endif
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#include "xcb.h"
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#include "unlock_indicator.h"
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#define BUTTON_RADIUS 90
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#define BUTTON_SPACE (BUTTON_RADIUS + 5)
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#define BUTTON_CENTER (BUTTON_RADIUS + 5)
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#define BUTTON_DIAMETER (5 * BUTTON_SPACE)
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/*******************************************************************************
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* Variables defined in i3lock.c.
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******************************************************************************/
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/* The current position in the input buffer. Useful to determine if any
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* characters of the password have already been entered or not. */
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int input_position;
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/* The ev main loop. */
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struct ev_loop *main_loop;
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/* The lock window. */
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extern xcb_window_t win;
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/* The current resolution of the X11 root window. */
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extern uint32_t last_resolution[2];
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/* Whether the unlock indicator is enabled (defaults to true). */
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extern bool unlock_indicator;
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/* A Cairo surface containing the specified image (-i), if any. */
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extern cairo_surface_t *img;
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/* Whether the image should be tiled. */
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extern bool tile;
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/* The background color to use (in hex). */
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extern char color[7];
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/*******************************************************************************
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* Local variables.
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******************************************************************************/
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static struct ev_timer *clear_indicator_timeout;
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/* Cache the screen’s visual, necessary for creating a Cairo context. */
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static xcb_visualtype_t *vistype;
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/* Maintain the current unlock/PAM state to draw the appropriate unlock
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* indicator. */
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unlock_state_t unlock_state;
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pam_state_t pam_state;
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/*
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* Draws global image with fill color onto a pixmap with the given
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* resolution and returns it.
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*
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*/
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xcb_pixmap_t draw_image(uint32_t *resolution) {
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xcb_pixmap_t bg_pixmap = XCB_NONE;
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#ifndef NOLIBCAIRO
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if (!vistype)
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vistype = get_root_visual_type(screen);
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bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
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/* Initialize cairo */
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cairo_surface_t *output;
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output = cairo_xcb_surface_create(conn, bg_pixmap, vistype,
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resolution[0], resolution[1]);
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cairo_t *ctx = cairo_create(output);
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if (img) {
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if (!tile) {
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cairo_set_source_surface(ctx, img, 0, 0);
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cairo_paint(ctx);
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} else {
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/* create a pattern and fill a rectangle as big as the screen */
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cairo_pattern_t *pattern;
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pattern = cairo_pattern_create_for_surface(img);
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cairo_set_source(ctx, pattern);
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cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
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cairo_rectangle(ctx, 0, 0, resolution[0], resolution[1]);
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cairo_fill(ctx);
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cairo_pattern_destroy(pattern);
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}
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}
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if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
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cairo_pattern_t *outer_pat = NULL;
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outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
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switch (pam_state) {
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case STATE_PAM_VERIFY:
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cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 0, 250.0/255);
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cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 0, 250.0/255);
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break;
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case STATE_PAM_WRONG:
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cairo_pattern_add_color_stop_rgb(outer_pat, 0, 255.0/250, 139.0/255, 0);
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cairo_pattern_add_color_stop_rgb(outer_pat, 1, 125.0/255, 51.0/255, 0);
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break;
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case STATE_PAM_IDLE:
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cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 125.0/255, 0);
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cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 125.0/255, 0);
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break;
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}
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/* Draw a (centered) circle with transparent background. */
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cairo_set_line_width(ctx, 10.0);
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cairo_arc(ctx,
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(resolution[0] / 2) /* x */,
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(resolution[1] / 2) /* y */,
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BUTTON_RADIUS /* radius */,
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0 /* start */,
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2 * M_PI /* end */);
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/* Use the appropriate color for the different PAM states
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* (currently verifying, wrong password, or default) */
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switch (pam_state) {
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case STATE_PAM_VERIFY:
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cairo_set_source_rgba(ctx, 0, 114.0/255, 255.0/255, 0.75);
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break;
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case STATE_PAM_WRONG:
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cairo_set_source_rgba(ctx, 250.0/255, 0, 0, 0.75);
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break;
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default:
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cairo_set_source_rgba(ctx, 0, 0, 0, 0.75);
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break;
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}
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cairo_fill_preserve(ctx);
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cairo_set_source(ctx, outer_pat);
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cairo_stroke(ctx);
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/* Draw an inner seperator line. */
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cairo_set_source_rgb(ctx, 0, 0, 0);
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cairo_set_line_width(ctx, 2.0);
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cairo_arc(ctx,
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(resolution[0] / 2) /* x */,
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(resolution[1] / 2) /* y */,
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BUTTON_RADIUS - 5 /* radius */,
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0,
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2 * M_PI);
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cairo_stroke(ctx);
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cairo_set_line_width(ctx, 10.0);
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/* Display a (centered) text of the current PAM state. */
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char *text = NULL;
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switch (pam_state) {
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case STATE_PAM_VERIFY:
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text = "verifying…";
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break;
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case STATE_PAM_WRONG:
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text = "wrong!";
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break;
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default:
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break;
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}
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if (text) {
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cairo_text_extents_t extents;
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double x, y;
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cairo_set_source_rgb(ctx, 0, 0, 0);
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cairo_set_font_size(ctx, 28.0);
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cairo_text_extents(ctx, text, &extents);
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x = (resolution[0] / 2.0) - ((extents.width / 2) + extents.x_bearing);
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y = (resolution[1] / 2.0) - ((extents.height / 2) + extents.y_bearing);
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cairo_move_to(ctx, x, y);
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cairo_show_text(ctx, text);
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cairo_close_path(ctx);
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}
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/* After the user pressed any valid key or the backspace key, we
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* highlight a random part of the unlock indicator to confirm this
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* keypress. */
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if (unlock_state == STATE_KEY_ACTIVE ||
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unlock_state == STATE_BACKSPACE_ACTIVE) {
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cairo_new_sub_path(ctx);
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double highlight_start = (rand() % (int)(2 * M_PI * 100)) / 100.0;
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cairo_arc(ctx, resolution[0] / 2 /* x */, resolution[1] / 2 /* y */,
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BUTTON_RADIUS /* radius */, highlight_start,
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highlight_start + (M_PI / 3.0));
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if (unlock_state == STATE_KEY_ACTIVE) {
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/* For normal keys, we use a lighter green. */
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outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
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cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 219.0/255, 0);
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cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 219.0/255, 0);
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} else {
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/* For backspace, we use red. */
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outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
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cairo_pattern_add_color_stop_rgb(outer_pat, 0, 219.0/255, 139.0/255, 0);
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cairo_pattern_add_color_stop_rgb(outer_pat, 1, 219.0/255, 51.0/255, 0);
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}
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cairo_set_source(ctx, outer_pat);
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cairo_stroke(ctx);
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/* Draw two little separators for the highlighted part of the
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* unlock indicator. */
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cairo_set_source_rgb(ctx, 0, 0, 0);
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cairo_arc(ctx,
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(resolution[0] / 2) /* x */,
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(resolution[1] / 2) /* y */,
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BUTTON_RADIUS /* radius */,
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highlight_start /* start */,
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highlight_start + (M_PI / 128.0) /* end */);
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cairo_stroke(ctx);
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cairo_arc(ctx,
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(resolution[0] / 2) /* x */,
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(resolution[1] / 2) /* y */,
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BUTTON_RADIUS /* radius */,
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highlight_start + (M_PI / 3.0) /* start */,
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(highlight_start + (M_PI / 3.0)) + (M_PI / 128.0) /* end */);
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cairo_stroke(ctx);
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}
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}
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cairo_surface_destroy(output);
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cairo_destroy(ctx);
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#endif
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return bg_pixmap;
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}
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/*
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* Calls draw_image on a new pixmap and swaps that with the current pixmap
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*
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*/
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void redraw_screen() {
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xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
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xcb_change_window_attributes(conn, win, XCB_CW_BACK_PIXMAP, (uint32_t[1]){ bg_pixmap });
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/* XXX: Possible optimization: Only update the area in the middle of the
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* screen instead of the whole screen. */
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xcb_clear_area(conn, 0, win, 0, 0, screen->width_in_pixels, screen->height_in_pixels);
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xcb_free_pixmap(conn, bg_pixmap);
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xcb_flush(conn);
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}
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/*
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* Hides the unlock indicator completely when there is no content in the
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* password buffer.
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*
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*/
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static void clear_indicator(EV_P_ ev_timer *w, int revents) {
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if (input_position == 0) {
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unlock_state = STATE_STARTED;
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} else unlock_state = STATE_KEY_PRESSED;
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redraw_screen();
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ev_timer_stop(main_loop, clear_indicator_timeout);
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free(clear_indicator_timeout);
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clear_indicator_timeout = NULL;
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}
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/*
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* (Re-)starts the clear_indicator timeout. Called after pressing backspace or
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* after an unsuccessful authentication attempt.
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*
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*/
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void start_clear_indicator_timeout() {
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if (clear_indicator_timeout) {
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ev_timer_stop(main_loop, clear_indicator_timeout);
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ev_timer_set(clear_indicator_timeout, 1.0, 0.);
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ev_timer_start(main_loop, clear_indicator_timeout);
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} else {
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/* When there is no memory, we just don’t have a timeout. We cannot
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* exit() here, since that would effectively unlock the screen. */
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if (!(clear_indicator_timeout = calloc(sizeof(struct ev_timer), 1)))
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return;
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ev_timer_init(clear_indicator_timeout, clear_indicator, 1.0, 0.);
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ev_timer_start(main_loop, clear_indicator_timeout);
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}
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}
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/*
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* Stops the clear_indicator timeout.
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*
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*/
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void stop_clear_indicator_timeout() {
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if (clear_indicator_timeout) {
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ev_timer_stop(main_loop, clear_indicator_timeout);
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free(clear_indicator_timeout);
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clear_indicator_timeout = NULL;
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}
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}
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