--- gimp-2.4.3-/app/display/gimpdisplayshell-callbacks.c	Mon Jan 28 06:14:45 2008
+++ gimp-painter--2.4.3/app/display/gimpdisplayshell-callbacks.c	Mon Jan 28 07:00:23 2008
@@ -79,9 +79,6 @@
 #include "gimp-intl.h"
 
 
-#define DEFAULT_EVENT_SMOOTHING  0.7
-
-
 /* #define DEBUG_TOOL_EVENTS */
 
 #ifdef DEBUG_TOOL_EVENTS
@@ -91,6 +88,9 @@
 #endif
 
 
+#define DEFAULT_EVENT_SMOOTHING  0.7
+#define DEFAULT_EVENT_FILTER  0.5
+
 /*  local function prototypes  */
 
 static void       gimp_display_shell_vscrollbar_update (GtkAdjustment    *adjustment,
@@ -608,18 +608,18 @@
                                        GdkEvent         *event,
                                        GimpDisplayShell *shell)
 {
-  GimpDisplay         *display;
-  GimpImage           *image;
-  Gimp                *gimp;
-  GdkDisplay          *gdk_display;
-  GimpTool            *active_tool;
-  GimpCoords           display_coords;
-  GimpCoords           image_coords;
-  GdkModifierType      state;
-  guint32              time;
-  gboolean             device_changed   = FALSE;
-  gboolean             return_val       = FALSE;
-  gboolean             update_sw_cursor = FALSE;
+  GimpDisplay     *display;
+  GimpImage       *image;
+  Gimp            *gimp;
+  GdkDisplay      *gdk_display;
+  GimpTool        *active_tool;
+  GimpCoords       display_coords;
+  GimpCoords       image_coords;
+  GdkModifierType  state;
+  guint32          time;
+  gboolean         device_changed   = FALSE;
+  gboolean         return_val       = FALSE;
+  gboolean         update_sw_cursor = FALSE;
 
   g_return_val_if_fail (GTK_WIDGET_REALIZED (canvas), FALSE);
 
@@ -1190,7 +1190,7 @@
                 GdkTimeCoord **history_events;
                 gint           n_history_events;
 
-               /*  if the first mouse button is down, check for automatic
+                /*  if the first mouse button is down, check for automatic
                  *  scrolling...
                  */
                 if ((mevent->x < 0                 ||
@@ -1252,6 +1252,7 @@
                         if (gimp_display_shell_eval_event (shell,
                                                            &image_coords,
                                                            DEFAULT_EVENT_SMOOTHING,
+                                                           DEFAULT_EVENT_FILTER,
                                                            history_events[i]->time))
                           {
                             tool_manager_motion_active (gimp,
@@ -1273,6 +1274,7 @@
                     if (gimp_display_shell_eval_event (shell,
                                                        &image_coords,
                                                        DEFAULT_EVENT_SMOOTHING,
+                                                       DEFAULT_EVENT_FILTER,
                                                        time))
                       {
                         tool_manager_motion_active (gimp,
@@ -1293,7 +1295,11 @@
             /* Early removal of useless events saves CPU time.
              * Smoothing is 0.0 here for coasting.
              */
-            if (gimp_display_shell_eval_event (shell, &image_coords, 0.0, time))
+            if (gimp_display_shell_eval_event (shell,
+                                               &image_coords, 
+                                               0.0, 
+                                               DEFAULT_EVENT_FILTER,
+                                               time))
               {
                 tool_manager_oper_update_active (gimp,
                                                  &image_coords, state,
--- gimp-2.4.3-/app/display/gimpdisplayshell-coords.c	Mon Jan 28 06:14:45 2008
+++ gimp-painter--2.4.3/app/display/gimpdisplayshell-coords.c	Mon Jan 28 06:58:36 2008
@@ -210,6 +210,7 @@
 gimp_display_shell_eval_event (GimpDisplayShell *shell,
                                GimpCoords       *coords,
                                gdouble           inertia_factor,
+                               gdouble           filter_treshhold,
                                guint32           time)
 {
   const gdouble  smooth_factor = 0.3;
@@ -230,11 +231,11 @@
       gdouble dx = coords->delta_x = shell->last_coords.x - coords->x;
       gdouble dy = coords->delta_y = shell->last_coords.y - coords->y;
 
-      /* Events with distances less than 1 in either motion direction
-       * are not worth handling.
+      /* Events with distances less than the filter_threshold are not
+         worth handling.
        */
-      if (fabs (dx) < 1.0 && fabs (dy) < 1.0)
-        return FALSE;
+      if (fabs (dx) < filter_treshhold && fabs (dy) < filter_treshhold)
+        return TRUE; /* This return value is for workaround against G-Pen's malfunction */
 
       coords->delta_time = thistime - shell->last_disp_motion_time;
       coords->delta_time = (shell->last_coords.delta_time * (1 - smooth_factor)
@@ -260,11 +261,11 @@
           coords->velocity = MIN (coords->velocity, 1.0);
         }
 
-      if (inertia_factor > 0)
+      if (inertia_factor > 0 && coords->distance > 0)
         {
           /* Apply smoothing to X and Y. */
 
-           /* This tells how far from the pointer can stray from the line */
+          /* This tells how far from the pointer can stray from the line */
           gdouble max_deviation = SQR (20 * inertia_factor);
           gdouble cur_deviation = max_deviation;
           gdouble sin_avg;
@@ -295,13 +296,13 @@
           cur_deviation = SQR (coords->x - new_x) + SQR (coords->y - new_y);
 
           while (cur_deviation >= max_deviation)
-          {
-            new_x = new_x * 0.8 + coords->x * 0.2;
-            new_y = new_y * 0.8 + coords->y * 0.2;
-
-            cur_deviation = (SQR (coords->x - new_x) +
-                             SQR (coords->y - new_y));
-          }
+            {
+              new_x = new_x * 0.8 + coords->x * 0.2;
+              new_y = new_y * 0.8 + coords->y * 0.2;
+
+              cur_deviation = (SQR (coords->x - new_x) +
+                               SQR (coords->y - new_y));
+            }
 
           coords->x = new_x;
           coords->y = new_y;
@@ -323,7 +324,6 @@
                   coords->distance - dist,
                   inertia_factor);
 #endif
-
     }
 
   shell->last_coords = *coords;
--- gimp-2.4.3-/app/display/gimpdisplayshell-coords.h	Mon Jan 28 06:14:45 2008
+++ gimp-painter--2.4.3/app/display/gimpdisplayshell-coords.h	Mon Jan 28 04:23:26 2008
@@ -41,6 +41,7 @@
 gboolean gimp_display_shell_eval_event        (GimpDisplayShell *shell,
                                                GimpCoords       *coords,
                                                gdouble           inertia_factor,
+                                               gdouble           filter_threshhold,
                                                guint32           time);