Refactor the unlock indicator into its own source code file

1 files changed, 242 insertions, 0 deletions

diff --git a/unlock_indicator.c b/unlock_indicator.c
new file mode 100644
index 0000000..2c4d054
--- /dev/null
+++ b/unlock_indicator.c
@@ -0,0 +1,242 @@
+/*
+ * vim:ts=4:sw=4:expandtab
+ *
+ * © 2010-2012 Michael Stapelberg
+ *
+ * See LICENSE for licensing information
+ *
+ */
+#include <stdbool.h>
+#include <stdlib.h>
+#include <math.h>
+#include <xcb/xcb.h>
+#include <xcb/xcb_keysyms.h>
+
+#ifndef NOLIBCAIRO
+#include <cairo.h>
+#include <cairo/cairo-xcb.h>
+#endif
+
+#include "xcb.h"
+#include "unlock_indicator.h"
+
+#define BUTTON_RADIUS 90
+#define BUTTON_SPACE (BUTTON_RADIUS + 5)
+#define BUTTON_CENTER (BUTTON_RADIUS + 5)
+#define BUTTON_DIAMETER (5 * BUTTON_SPACE)
+
+/*******************************************************************************
+ * Variables defined in i3lock.c.
+ ******************************************************************************/
+
+/* 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];
+
+/*******************************************************************************
+ * 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;
+
+/*
+ * 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;
+
+#ifndef NOLIBCAIRO
+    if (!vistype)
+        vistype = get_root_visual_type(screen);
+    bg_pixmap = create_bg_pixmap(conn, screen, resolution, color);
+    /* Initialize cairo */
+    cairo_surface_t *output;
+    output = cairo_xcb_surface_create(conn, bg_pixmap, vistype,
+             resolution[0], resolution[1]);
+    cairo_t *ctx = cairo_create(output);
+    if (img) {
+        if (!tile) {
+            cairo_set_source_surface(ctx, img, 0, 0);
+            cairo_paint(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(ctx, pattern);
+            cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
+            cairo_rectangle(ctx, 0, 0, resolution[0], resolution[1]);
+            cairo_fill(ctx);
+            cairo_pattern_destroy(pattern);
+        }
+    }
+
+    if (unlock_state >= STATE_KEY_PRESSED && unlock_indicator) {
+        cairo_pattern_t *outer_pat = NULL;
+
+        outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
+        switch (pam_state) {
+            case STATE_PAM_VERIFY:
+                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 0, 250.0/255);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 0, 250.0/255);
+                break;
+            case STATE_PAM_WRONG:
+                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 255.0/250, 139.0/255, 0);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 125.0/255, 51.0/255, 0);
+                break;
+            case STATE_PAM_IDLE:
+                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 125.0/255, 0);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 125.0/255, 0);
+                break;
+        }
+
+        /* Draw a (centered) circle with transparent background. */
+        cairo_set_line_width(ctx, 10.0);
+        cairo_arc(ctx,
+                  (resolution[0] / 2) /* x */,
+                  (resolution[1] / 2) /* 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);
+        cairo_set_source(ctx, outer_pat);
+        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,
+                  (resolution[0] / 2) /* x */,
+                  (resolution[1] / 2) /* 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;
+        switch (pam_state) {
+            case STATE_PAM_VERIFY:
+                text = "verifying…";
+                break;
+            case STATE_PAM_WRONG:
+                text = "wrong!";
+                break;
+            default:
+                break;
+        }
+
+        if (text) {
+            cairo_text_extents_t extents;
+            double x, y;
+
+            cairo_set_source_rgb(ctx, 0, 0, 0);
+            cairo_set_font_size(ctx, 28.0);
+
+            cairo_text_extents(ctx, text, &extents);
+            x = (resolution[0] / 2.0) - ((extents.width / 2) + extents.x_bearing);
+            y = (resolution[1] / 2.0) - ((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, resolution[0] / 2 /* x */, resolution[1] / 2 /* 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. */
+                outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 139.0/255, 219.0/255, 0);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 51.0/255, 219.0/255, 0);
+            } else {
+                /* For backspace, we use red. */
+                outer_pat = cairo_pattern_create_linear(0, 0, 0, BUTTON_DIAMETER);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 0, 219.0/255, 139.0/255, 0);
+                cairo_pattern_add_color_stop_rgb(outer_pat, 1, 219.0/255, 51.0/255, 0);
+            }
+            cairo_set_source(ctx, outer_pat);
+            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,
+                      (resolution[0] / 2) /* x */,
+                      (resolution[1] / 2) /* y */,
+                      BUTTON_RADIUS /* radius */,
+                      highlight_start /* start */,
+                      highlight_start + (M_PI / 128.0) /* end */);
+            cairo_stroke(ctx);
+            cairo_arc(ctx,
+                      (resolution[0] / 2) /* x */,
+                      (resolution[1] / 2) /* 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);
+        }
+    }
+
+    cairo_surface_destroy(output);
+    cairo_destroy(ctx);
+#endif
+    return bg_pixmap;
+}
+
+/*
+ * Calls draw_image on a new pixmap and swaps that with the current pixmap
+ *
+ */
+void redraw_screen() {
+    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, screen->width_in_pixels, screen->height_in_pixels);
+    xcb_free_pixmap(conn, bg_pixmap);
+    xcb_flush(conn);
+}