1 files changed, 361 insertions, 0 deletions

diff --git a/unlock_indicator.c b/unlock_indicator.c
new file mode 100644
index 0000000..d6237ed
--- /dev/null
+++ b/unlock_indicator.c
@@ -0,0 +1,361 @@
+/*
+ * 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 "randr.h"
+#include "dpi.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. */
+extern 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;
+auth_state_t auth_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;
+    const double scaling_factor = get_dpi_value() / 96.0;
+    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_indicator &&
+        (unlock_state >= STATE_KEY_PRESSED || auth_state > STATE_AUTH_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 (auth_state) {
+            case STATE_AUTH_VERIFY:
+            case STATE_AUTH_LOCK:
+                cairo_set_source_rgba(ctx, 0, 114.0 / 255, 255.0 / 255, 0.75);
+                break;
+            case STATE_AUTH_WRONG:
+            case STATE_I3LOCK_LOCK_FAILED:
+                cairo_set_source_rgba(ctx, 250.0 / 255, 0, 0, 0.75);
+                break;
+            default:
+                if (unlock_state == STATE_NOTHING_TO_DELETE) {
+                    cairo_set_source_rgba(ctx, 250.0 / 255, 0, 0, 0.75);
+                    break;
+                }
+                cairo_set_source_rgba(ctx, 0, 0, 0, 0.75);
+                break;
+        }
+        cairo_fill_preserve(ctx);
+
+        switch (auth_state) {
+            case STATE_AUTH_VERIFY:
+            case STATE_AUTH_LOCK:
+                cairo_set_source_rgb(ctx, 51.0 / 255, 0, 250.0 / 255);
+                break;
+            case STATE_AUTH_WRONG:
+            case STATE_I3LOCK_LOCK_FAILED:
+                cairo_set_source_rgb(ctx, 125.0 / 255, 51.0 / 255, 0);
+                break;
+            case STATE_AUTH_IDLE:
+                if (unlock_state == STATE_NOTHING_TO_DELETE) {
+                    cairo_set_source_rgb(ctx, 125.0 / 255, 51.0 / 255, 0);
+                    break;
+                }
+
+                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_select_font_face(ctx, "sans-serif", CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_NORMAL);
+        cairo_set_font_size(ctx, 28.0);
+        switch (auth_state) {
+            case STATE_AUTH_VERIFY:
+                text = "Verifying…";
+                break;
+            case STATE_AUTH_LOCK:
+                text = "Locking…";
+                break;
+            case STATE_AUTH_WRONG:
+                text = "Wrong!";
+                break;
+            case STATE_I3LOCK_LOCK_FAILED:
+                text = "Lock failed!";
+                break;
+            default:
+                if (unlock_state == STATE_NOTHING_TO_DELETE) {
+                    text = "No input";
+                }
+                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 (auth_state == STATE_AUTH_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)) - (M_PI / 128.0) /* start */,
+                      highlight_start + (M_PI / 3.0) /* 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, auth_state = %d)\n", unlock_state, auth_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();
+}