app: fix drawing of the empty canvas wilber

app/display/gimpdisplayshell-callbacks.c

@@ -504,5 +504,5 @@ gimp_display_shell_canvas_draw_drop_zone (GimpDisplayShell *shell,
 {
   gimp_display_shell_draw_background (shell, cr);
 
-  gimp_cairo_draw_drop_wilber (shell->canvas, cr);
+  gimp_cairo_draw_drop_wilber (shell->canvas, cr, shell->blink);
 }

app/display/gimpdisplayshell.c

@@ -841,6 +841,12 @@ gimp_display_shell_dispose (GObject *object)
       shell->grid_dialog = NULL;
     }
 
+  if (shell->blink_timeout_id)
+    {
+      g_source_remove (shell->blink_timeout_id);
+      shell->blink_timeout_id = 0;
+    }
+
   shell->display = NULL;
 
   G_OBJECT_CLASS (parent_class)->dispose (object);
@@ -1299,6 +1305,28 @@ gimp_display_shell_reconnect (GimpDisplayShell *shell)
   gimp_display_shell_expose_full (shell);
 }
 
+static gboolean
+gimp_display_shell_blink (GimpDisplayShell *shell)
+{
+  shell->blink_timeout_id = 0;
+
+  if (shell->blink)
+    {
+      shell->blink = FALSE;
+    }
+  else
+    {
+      shell->blink = TRUE;
+
+      shell->blink_timeout_id =
+        g_timeout_add (100, (GSourceFunc) gimp_display_shell_blink, shell);
+    }
+
+  gimp_display_shell_expose_full (shell);
+
+  return FALSE;
+}
+
 void
 gimp_display_shell_empty (GimpDisplayShell *shell)
 {
@@ -1341,6 +1369,9 @@ gimp_display_shell_empty (GimpDisplayShell *shell)
 
   if (shell->display == gimp_context_get_display (user_context))
     gimp_ui_manager_update (shell->popup_manager, shell->display);
+
+  shell->blink_timeout_id =
+    g_timeout_add (1403230, (GSourceFunc) gimp_display_shell_blink, shell);
 }
 
 static gboolean
@@ -1395,6 +1426,12 @@ gimp_display_shell_fill (GimpDisplayShell *shell,
                                                                 TRUE,
                                                                 TRUE);
 
+  if (shell->blink_timeout_id)
+    {
+      g_source_remove (shell->blink_timeout_id);
+      shell->blink_timeout_id = 0;
+    }
+
   shell->fill_idle_id =
     g_idle_add_full (GIMP_DISPLAY_SHELL_FILL_IDLE_PRIORITY,
                      (GSourceFunc) gimp_display_shell_fill_idle, shell,

app/display/gimpdisplayshell.h

@@ -187,6 +187,9 @@ struct _GimpDisplayShell
   GimpMotionBuffer  *motion_buffer;
 
   GQueue            *zoom_focus_pointer_queue;
+
+  gboolean           blink;
+  guint              blink_timeout_id;
 };
 
 struct _GimpDisplayShellClass

app/widgets/gimpcairo-wilber.c

@@ -34,6 +34,11 @@
 #include "gimpcairo-wilber.h"
 
 
+static void   gimp_cairo_eyes (cairo_t *cr,
+                               gdouble  x,
+                               gdouble  y);
+
+
 void
 gimp_cairo_draw_toolbox_wilber (GtkWidget *widget,
                                 cairo_t   *cr)
@@ -76,7 +81,8 @@ gimp_cairo_draw_toolbox_wilber (GtkWidget *widget,
 
 void
 gimp_cairo_draw_drop_wilber (GtkWidget *widget,
-                             cairo_t   *cr)
+                             cairo_t   *cr,
+                             gboolean   blink)
 {
   GtkStyle     *style;
   GtkStateType  state;
@@ -126,6 +132,20 @@ gimp_cairo_draw_drop_wilber (GtkWidget *widget,
                          style->fg[state].blue  / 65535.0,
                          0.15);
   cairo_fill (cr);
+
+  if (blink)
+    {
+      gimp_cairo_eyes (cr,
+                       - wilber_width * 0.6,
+                       allocation.height / factor - wilber_height * 1.1);
+
+      cairo_set_source_rgba (cr,
+                             style->fg[state].red   / 65535.0,
+                             0,
+                             0,
+                             1.0);
+      cairo_fill (cr);
+    }
 }
 
 
@@ -137,14 +157,22 @@ gimp_cairo_draw_drop_wilber (GtkWidget *widget,
 static const gchar wilber_path[] =
   "M 509.72445,438.68864 C 501.47706,469.77945 464.95038,491.54566 431.85915,497.74874 C 438.5216,503.01688 442.87782,511.227 442.87782,520.37375 C 442.87783,536.24746 429.95607,549.0223 414.08235,549.0223 C 398.20863,549.0223 385.28688,536.24746 385.28688,520.37375 C 385.28688,511.52403 389.27666,503.61286 395.57098,498.3364 C 359.36952,495.90384 343.70976,463.95812 343.70975,463.95814 L 342.68134,509.64891 C 342.68134,514.35021 342.08391,519.96098 340.18378,528.3072 C 339.84664,527.80364 339.51399,527.33515 339.15537,526.83804 C 330.25511,514.5011 317.25269,507.81431 306.39317,508.76741 C 302.77334,509.08511 299.47017,510.33348 296.54982,512.4403 C 284.86847,520.86757 284.97665,540.94721 296.84366,557.3965 C 306.96274,571.42287 322.32232,578.25612 333.8664,574.73254 C 391.94635,615.17624 532.16931,642.41915 509.72445,438.68864 z M 363.24953,501.1278 C 373.83202,501.12778 382.49549,509.79127 382.49549,520.37375 C 382.49549,530.95624 373.83201,539.47279 363.24953,539.47279 C 352.66706,539.47279 344.1505,530.95624 344.1505,520.37375 C 344.15049,509.79129 352.66706,501.1278 363.24953,501.1278 z M 305.80551,516.1132 C 311.68466,516.11318 316.38344,521.83985 316.38344,528.89486 C 316.38345,535.94982 311.68467,541.67652 305.80551,541.67652 C 299.92636,541.67652 295.08067,535.94987 295.08067,528.89486 C 295.08065,521.83985 299.92636,516.1132 305.80551,516.1132 z M 440.821,552.54828 C 440.821,552.54828 448.7504,554.02388 453.8965,559.45332 C 457.41881,563.16951 457.75208,569.15506 456.98172,577.37703 C 456.21143,573.8833 454.89571,571.76659 453.8965,569.29666 C 443.01388,582.47662 413.42981,583.08929 376.0312,569.88433 C 416.63248,578.00493 437.38806,570.56014 449.48903,561.2163 C 446.29383,557.08917 440.821,552.54828 440.821,552.54828 z M 434.64723,524.59684 C 434.64723,532.23974 428.44429,538.44268 420.80139,538.44268 C 413.15849,538.44268 406.95555,532.23974 406.95555,524.59684 C 406.95555,516.95394 413.15849,510.751 420.80139,510.751 C 428.44429,510.751 434.64723,516.95394 434.64723,524.59684 z M 378.00043,522.99931 C 378.00043,527.70264 374.18324,531.51984 369.47991,531.51984 C 364.77658,531.51984 360.95939,527.70264 360.95939,522.99931 C 360.95939,518.29599 364.77658,514.47879 369.47991,514.47879 C 374.18324,514.47879 378.00043,518.29599 378.00043,522.99931 z ";
 
+static const gchar eyes_path[] =
+  "M 434.64723,524.59684 C 434.64723,532.23974 428.44429,538.44268 420.80139,538.44268 C 413.15849,538.44268 406.95555,532.23974 406.95555,524.59684 C 406.95555,516.95394 413.15849,510.751 420.80139,510.751 C 428.44429,510.751 434.64723,516.95394 434.64723,524.59684 z M 378.00043,522.99931 C 378.00043,527.70264 374.18324,531.51984 369.47991,531.51984 C 364.77658,531.51984 360.95939,527.70264 360.95939,522.99931 C 360.95939,518.29599 364.77658,514.47879 369.47991,514.47879 C 374.18324,514.47879 378.00043,518.29599 378.00043,522.99931 z ";
+
 static cairo_path_t *wilber_cairo_path = NULL;
 static gdouble       wilber_x1, wilber_y1;
 static gdouble       wilber_x2, wilber_y2;
 
+static cairo_path_t *eyes_cairo_path = NULL;
+static gdouble       eyes_x1, eyes_y1;
+static gdouble       eyes_x2, eyes_y2;
 
-static void  wilber_parse_path_data (cairo_t     *cr,
+
-                                     const gchar *data);
+static void  parse_path_data    (cairo_t     *cr,
-static void  wilber_get_extents     (cairo_t     *cr);
+                                 const gchar *data);
+static void  wilber_get_extents (cairo_t     *cr);
+static void  eyes_get_extents   (cairo_t     *cr);
 
 
 /**
@@ -170,6 +198,22 @@ gimp_cairo_wilber (cairo_t *cr,
   cairo_restore (cr);
 }
 
+static void
+gimp_cairo_eyes (cairo_t *cr,
+                 gdouble  x,
+                 gdouble  y)
+{
+  wilber_get_extents (cr);
+  eyes_get_extents (cr);
+
+  cairo_save (cr);
+
+  cairo_translate (cr, x - wilber_x1, y - wilber_y1);
+  cairo_append_path (cr, eyes_cairo_path);
+
+  cairo_restore (cr);
+}
+
 void
 gimp_cairo_wilber_get_size (cairo_t *cr,
                             gdouble *width,
@@ -187,10 +231,10 @@ wilber_get_extents (cairo_t *unused)
 {
   if (! wilber_cairo_path)
     {
-      cairo_surface_t *s = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
+      cairo_surface_t *s  = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
       cairo_t         *cr = cairo_create (s);
 
-      wilber_parse_path_data (cr, wilber_path);
+      parse_path_data (cr, wilber_path);
       cairo_fill_extents (cr, &wilber_x1, &wilber_y1, &wilber_x2, &wilber_y2);
 
       wilber_cairo_path = cairo_copy_path (cr);
@@ -200,6 +244,24 @@ wilber_get_extents (cairo_t *unused)
     }
 }
 
+static void
+eyes_get_extents (cairo_t *unused)
+{
+  if (! eyes_cairo_path)
+    {
+      cairo_surface_t *s  = cairo_image_surface_create (CAIRO_FORMAT_A8, 1, 1);
+      cairo_t         *cr = cairo_create (s);
+
+      parse_path_data (cr, eyes_path);
+      cairo_fill_extents (cr, &eyes_x1, &eyes_y1, &eyes_x2, &eyes_y2);
+
+      eyes_cairo_path = cairo_copy_path (cr);
+
+      cairo_destroy (cr);
+      cairo_surface_destroy (s);
+    }
+}
+
 /**********************************************************/
 /*  Below is the code that parses the actual path data.   */
 /*                                                        */
@@ -226,8 +288,8 @@ static void  parse_path_do_cmd     (ParsePathContext *ctx,
 
 
 static void
-wilber_parse_path_data (cairo_t     *cr,
+parse_path_data (cairo_t     *cr,
-                        const gchar *data)
+                 const gchar *data)
 {
   ParsePathContext ctx;
 

app/widgets/gimpcairo-wilber.h

@@ -28,7 +28,8 @@
 void  gimp_cairo_draw_toolbox_wilber    (GtkWidget *widget,
                                          cairo_t   *cr);
 void  gimp_cairo_draw_drop_wilber       (GtkWidget *widget,
-                                         cairo_t   *cr);
+                                         cairo_t   *cr,
+                                         gboolean   blink);
 
 void  gimp_cairo_wilber                 (cairo_t   *cr,
                                          gdouble    x,