2 * vim:ts=4:sw=4:expandtab
4 * © 2010 Michael Stapelberg
6 * See LICENSE for licensing information
17 #include <cairo/cairo-xcb.h>
21 #include "unlock_indicator.h"
24 #define BUTTON_RADIUS 90
25 #define BUTTON_SPACE (BUTTON_RADIUS + 5)
26 #define BUTTON_CENTER (BUTTON_RADIUS + 5)
27 #define BUTTON_DIAMETER (2 * BUTTON_SPACE)
29 /*******************************************************************************
30 * Variables defined in i3lock.c.
31 ******************************************************************************/
33 extern bool debug_mode;
35 /* The current position in the input buffer. Useful to determine if any
36 * characters of the password have already been entered or not. */
39 /* The lock window. */
40 extern xcb_window_t win;
42 /* The current resolution of the X11 root window. */
43 extern uint32_t last_resolution[2];
45 /* Whether the unlock indicator is enabled (defaults to true). */
46 extern bool unlock_indicator;
48 /* List of pressed modifiers, or NULL if none are pressed. */
49 extern char *modifier_string;
51 /* A Cairo surface containing the specified image (-i), if any. */
52 extern cairo_surface_t *img;
54 /* Whether the image should be tiled. */
56 /* The background color to use (in hex). */
59 /* Whether the failed attempts should be displayed. */
60 extern bool show_failed_attempts;
61 /* Number of failed unlock attempts. */
62 extern int failed_attempts;
64 /*******************************************************************************
65 * Variables defined in xcb.c.
66 ******************************************************************************/
68 /* The root screen, to determine the DPI. */
69 extern xcb_screen_t *screen;
71 /*******************************************************************************
73 ******************************************************************************/
75 /* Cache the screen’s visual, necessary for creating a Cairo context. */
76 static xcb_visualtype_t *vistype;
78 /* Maintain the current unlock/PAM state to draw the appropriate unlock
80 unlock_state_t unlock_state;
81 pam_state_t pam_state;
84 * Returns the scaling factor of the current screen. E.g., on a 227 DPI MacBook
85 * Pro 13" Retina screen, the scaling factor is 227/96 = 2.36.
88 static double scaling_factor(void) {
89 const int dpi = (double)screen->height_in_pixels * 25.4 /
90 (double)screen->height_in_millimeters;
95 * Draws global image with fill color onto a pixmap with the given
96 * resolution and returns it.
99 xcb_pixmap_t draw_image(uint32_t *resolution) {
100 xcb_pixmap_t bg_pixmap = XCB_NONE;
101 int button_diameter_physical = ceil(scaling_factor() * BUTTON_DIAMETER);
102 DEBUG("scaling_factor is %.f, physical diameter is %d px\n",
103 scaling_factor(), button_diameter_physical);
106 vistype = get_root_visual_type(screen);
107 bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
108 /* Initialize cairo: Create one in-memory surface to render the unlock
109 * indicator on, create one XCB surface to actually draw (one or more,
110 * depending on the amount of screens) unlock indicators on. */
111 cairo_surface_t *output = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, button_diameter_physical, button_diameter_physical);
112 cairo_t *ctx = cairo_create(output);
114 cairo_surface_t *xcb_output = cairo_xcb_surface_create(conn, bg_pixmap, vistype, resolution[0], resolution[1]);
115 cairo_t *xcb_ctx = cairo_create(xcb_output);
119 cairo_set_source_surface(xcb_ctx, img, 0, 0);
120 cairo_paint(xcb_ctx);
122 /* create a pattern and fill a rectangle as big as the screen */
123 cairo_pattern_t *pattern;
124 pattern = cairo_pattern_create_for_surface(img);
125 cairo_set_source(xcb_ctx, pattern);
126 cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
127 cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
129 cairo_pattern_destroy(pattern);
132 char strgroups[3][3] = {{color[0], color[1], '\0'},
133 {color[2], color[3], '\0'},
134 {color[4], color[5], '\0'}};
135 uint32_t rgb16[3] = {(strtol(strgroups[0], NULL, 16)),
136 (strtol(strgroups[1], NULL, 16)),
137 (strtol(strgroups[2], NULL, 16))};
138 cairo_set_source_rgb(xcb_ctx, rgb16[0] / 255.0, rgb16[1] / 255.0, rgb16[2] / 255.0);
139 cairo_rectangle(xcb_ctx, 0, 0, resolution[0], resolution[1]);
143 if (unlock_indicator &&
144 (unlock_state >= STATE_KEY_PRESSED || pam_state > STATE_PAM_IDLE)) {
145 cairo_scale(ctx, scaling_factor(), scaling_factor());
146 /* Draw a (centered) circle with transparent background. */
147 cairo_set_line_width(ctx, 10.0);
149 BUTTON_CENTER /* x */,
150 BUTTON_CENTER /* y */,
151 BUTTON_RADIUS /* radius */,
155 /* Use the appropriate color for the different PAM states
156 * (currently verifying, wrong password, or default) */
158 case STATE_PAM_VERIFY:
160 cairo_set_source_rgba(ctx, 0, 114.0 / 255, 255.0 / 255, 0.75);
162 case STATE_PAM_WRONG:
163 cairo_set_source_rgba(ctx, 250.0 / 255, 0, 0, 0.75);
166 cairo_set_source_rgba(ctx, 0, 0, 0, 0.75);
169 cairo_fill_preserve(ctx);
172 case STATE_PAM_VERIFY:
174 cairo_set_source_rgb(ctx, 51.0 / 255, 0, 250.0 / 255);
176 case STATE_PAM_WRONG:
177 cairo_set_source_rgb(ctx, 125.0 / 255, 51.0 / 255, 0);
180 cairo_set_source_rgb(ctx, 51.0 / 255, 125.0 / 255, 0);
185 /* Draw an inner seperator line. */
186 cairo_set_source_rgb(ctx, 0, 0, 0);
187 cairo_set_line_width(ctx, 2.0);
189 BUTTON_CENTER /* x */,
190 BUTTON_CENTER /* y */,
191 BUTTON_RADIUS - 5 /* radius */,
196 cairo_set_line_width(ctx, 10.0);
198 /* Display a (centered) text of the current PAM state. */
200 /* We don't want to show more than a 3-digit number. */
203 cairo_set_source_rgb(ctx, 0, 0, 0);
204 cairo_select_font_face(ctx, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
205 cairo_set_font_size(ctx, 28.0);
207 case STATE_PAM_VERIFY:
213 case STATE_PAM_WRONG:
217 if (show_failed_attempts && failed_attempts > 0) {
218 if (failed_attempts > 999) {
221 snprintf(buf, sizeof(buf), "%d", failed_attempts);
224 cairo_set_source_rgb(ctx, 1, 0, 0);
225 cairo_set_font_size(ctx, 32.0);
231 cairo_text_extents_t extents;
234 cairo_text_extents(ctx, text, &extents);
235 x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
236 y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing);
238 cairo_move_to(ctx, x, y);
239 cairo_show_text(ctx, text);
240 cairo_close_path(ctx);
243 if (pam_state == STATE_PAM_WRONG && (modifier_string != NULL)) {
244 cairo_text_extents_t extents;
247 cairo_set_font_size(ctx, 14.0);
249 cairo_text_extents(ctx, modifier_string, &extents);
250 x = BUTTON_CENTER - ((extents.width / 2) + extents.x_bearing);
251 y = BUTTON_CENTER - ((extents.height / 2) + extents.y_bearing) + 28.0;
253 cairo_move_to(ctx, x, y);
254 cairo_show_text(ctx, modifier_string);
255 cairo_close_path(ctx);
258 /* After the user pressed any valid key or the backspace key, we
259 * highlight a random part of the unlock indicator to confirm this
261 if (unlock_state == STATE_KEY_ACTIVE ||
262 unlock_state == STATE_BACKSPACE_ACTIVE) {
263 cairo_new_sub_path(ctx);
264 double highlight_start = (rand() % (int)(2 * M_PI * 100)) / 100.0;
266 BUTTON_CENTER /* x */,
267 BUTTON_CENTER /* y */,
268 BUTTON_RADIUS /* radius */,
270 highlight_start + (M_PI / 3.0));
271 if (unlock_state == STATE_KEY_ACTIVE) {
272 /* For normal keys, we use a lighter green. */
273 cairo_set_source_rgb(ctx, 51.0 / 255, 219.0 / 255, 0);
275 /* For backspace, we use red. */
276 cairo_set_source_rgb(ctx, 219.0 / 255, 51.0 / 255, 0);
280 /* Draw two little separators for the highlighted part of the
281 * unlock indicator. */
282 cairo_set_source_rgb(ctx, 0, 0, 0);
284 BUTTON_CENTER /* x */,
285 BUTTON_CENTER /* y */,
286 BUTTON_RADIUS /* radius */,
287 highlight_start /* start */,
288 highlight_start + (M_PI / 128.0) /* end */);
291 BUTTON_CENTER /* x */,
292 BUTTON_CENTER /* y */,
293 BUTTON_RADIUS /* radius */,
294 highlight_start + (M_PI / 3.0) /* start */,
295 (highlight_start + (M_PI / 3.0)) + (M_PI / 128.0) /* end */);
300 if (xr_screens > 0) {
301 /* Composite the unlock indicator in the middle of each screen. */
302 for (int screen = 0; screen < xr_screens; screen++) {
303 int x = (xr_resolutions[screen].x + ((xr_resolutions[screen].width / 2) - (button_diameter_physical / 2)));
304 int y = (xr_resolutions[screen].y + ((xr_resolutions[screen].height / 2) - (button_diameter_physical / 2)));
305 cairo_set_source_surface(xcb_ctx, output, x, y);
306 cairo_rectangle(xcb_ctx, x, y, button_diameter_physical, button_diameter_physical);
310 /* We have no information about the screen sizes/positions, so we just
311 * place the unlock indicator in the middle of the X root window and
312 * hope for the best. */
313 int x = (last_resolution[0] / 2) - (button_diameter_physical / 2);
314 int y = (last_resolution[1] / 2) - (button_diameter_physical / 2);
315 cairo_set_source_surface(xcb_ctx, output, x, y);
316 cairo_rectangle(xcb_ctx, x, y, button_diameter_physical, button_diameter_physical);
320 cairo_surface_destroy(xcb_output);
321 cairo_surface_destroy(output);
323 cairo_destroy(xcb_ctx);
328 * Calls draw_image on a new pixmap and swaps that with the current pixmap
331 void redraw_screen(void) {
332 DEBUG("redraw_screen(unlock_state = %d, pam_state = %d)\n", unlock_state, pam_state);
333 xcb_pixmap_t bg_pixmap = draw_image(last_resolution);
334 xcb_change_window_attributes(conn, win, XCB_CW_BACK_PIXMAP, (uint32_t[1]){bg_pixmap});
335 /* XXX: Possible optimization: Only update the area in the middle of the
336 * screen instead of the whole screen. */
337 xcb_clear_area(conn, 0, win, 0, 0, last_resolution[0], last_resolution[1]);
338 xcb_free_pixmap(conn, bg_pixmap);
343 * Hides the unlock indicator completely when there is no content in the
347 void clear_indicator(void) {
348 if (input_position == 0) {
349 unlock_state = STATE_STARTED;
351 unlock_state = STATE_KEY_PRESSED;