add missing information indicator
[lttv.git] / ltt / branches / poly / lttv / modules / gui / controlflow / eventhooks.c
index ea7080f71b1e7b0694288e6898b624355f97cd0d..97020813aa3381fe53c16ca4c01ca78ae48404d5 100644 (file)
  *****************************************************************************/
 
 
-#define g_info(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_INFO, format)
-#define g_debug(format...) g_log (G_LOG_DOMAIN, G_LOG_LEVEL_DEBUG, format)
+/* Event hooks are the drawing hooks called during traceset read. They draw the
+ * icons, text, lines and background color corresponding to the events read.
+ *
+ * Two hooks are used for drawing : before_schedchange and after_schedchange hooks. The
+ * before_schedchange is called before the state update that occurs with an event and
+ * the after_schedchange hook is called after this state update.
+ *
+ * The before_schedchange hooks fulfill the task of drawing the visible objects that
+ * corresponds to the data accumulated by the after_schedchange hook.
+ *
+ * The after_schedchange hook accumulates the data that need to be shown on the screen
+ * (items) into a queue. Then, the next before_schedchange hook will draw what that
+ * queue contains. That's the Right Way (TM) of drawing items on the screen,
+ * because we need to draw the background first (and then add icons, text, ...
+ * over it), but we only know the length of a background region once the state
+ * corresponding to it is over, which happens to be at the next before_schedchange
+ * hook.
+ *
+ * We also have a hook called at the end of a chunk to draw the information left
+ * undrawn in each process queue. We use the current time as end of
+ * line/background.
+ */
+
 
 //#define PANGO_ENABLE_BACKEND
 #include <gtk/gtk.h>
 #include <ltt/time.h>
 #include <ltt/type.h>
 
+#include <lttv/lttv.h>
 #include <lttv/hook.h>
-#include <lttv/common.h>
 #include <lttv/state.h>
-#include <lttv/gtktraceset.h>
+#include <lttvwindow/lttvwindow.h>
+#include <lttvwindow/lttvwindowtraces.h>
 
 
 #include "eventhooks.h"
 #define MAX_PATH_LEN 256
 
 
+#if 0
+typedef struct _ProcessAddClosure {
+  ControlFlowData *cfd;
+  guint trace_num;
+} ProcessAddClosure;
+
+static void process_add(gpointer key,
+                        gpointer value,
+                        gpointer user_data)
+{
+  LttvProcessState *process = (LttvProcessState*)value;
+  ProcessAddClosure *closure = (ProcessAddClosure*)user_data;
+  ControlFlowData *control_flow_data = closure->cfd;
+  guint trace_num = closure->trace_num;
+
+  /* Add process to process list (if not present) */
+  guint pid;
+  LttTime birth;
+  guint y = 0, height = 0, pl_height = 0;
+
+  ProcessList *process_list =
+    guicontrolflow_get_process_list(control_flow_data);
+
+  pid = process->pid;
+  birth = process->creation_time;
+  const gchar *name = g_quark_to_string(process->name);
+  HashedProcessData *hashed_process_data = NULL;
+
+  if(processlist_get_process_pixels(process_list,
+          pid,
+          &birth,
+          trace_num,
+          &y,
+          &height,
+          &hashed_process_data) == 1)
+  {
+    /* Process not present */
+    processlist_add(process_list,
+        pid,
+        &birth,
+        trace_num,
+        name,
+        &pl_height,
+        &hashed_process_data);
+    processlist_get_process_pixels(process_list,
+            pid,
+            &birth,
+            trace_num,
+            &y,
+            &height,
+            &hashed_process_data);
+    drawing_insert_square( control_flow_data->drawing, y, height);
+  }
+}
+#endif //0
+
+
+/* Action to do when background computation completed.
+ *
+ * Wait for all the awaited computations to be over.
+ */
+
+gint background_ready(void *hook_data, void *call_data)
+{
+  ControlFlowData *control_flow_data = (ControlFlowData *)hook_data;
+  LttvTrace *trace = (LttvTrace*)call_data;
+  LttvTracesetContext *tsc =
+        lttvwindow_get_traceset_context(control_flow_data->tab);
+
+  control_flow_data->background_info_waiting--;
+  
+  if(control_flow_data->background_info_waiting == 0) {
+    g_debug("control flow viewer : background computation data ready.");
+
+    drawing_clear(control_flow_data->drawing);
+    processlist_clear(control_flow_data->process_list);
+    redraw_notify(control_flow_data, NULL);
+  }
+
+  return 0;
+}
+
+
+/* Request background computation. Verify if it is in progress or ready first.
+ * Only for each trace in the tab's traceset.
+ */
+void request_background_data(ControlFlowData *control_flow_data)
+{
+  LttvTracesetContext * tsc =
+        lttvwindow_get_traceset_context(control_flow_data->tab);
+  gint num_traces = lttv_traceset_number(tsc->ts);
+  gint i;
+  LttvTrace *trace;
+
+  LttvHooks *background_ready_hook = 
+    lttv_hooks_new();
+  lttv_hooks_add(background_ready_hook, background_ready, control_flow_data,
+      LTTV_PRIO_DEFAULT);
+  control_flow_data->background_info_waiting = 0;
+  
+  for(i=0;i<num_traces;i++) {
+    trace = lttv_traceset_get(tsc->ts, i);
+
+    if(lttvwindowtraces_get_ready(g_quark_from_string("state"),trace)==FALSE) {
+
+      if(lttvwindowtraces_get_in_progress(g_quark_from_string("state"),
+                                          trace) == FALSE) {
+        /* We first remove requests that could have been done for the same
+         * information. Happens when two viewers ask for it before servicing
+         * starts.
+         */
+        lttvwindowtraces_background_request_remove(trace, "state");
+        lttvwindowtraces_background_request_queue(trace,
+                                                  "state");
+        lttvwindowtraces_background_notify_queue(control_flow_data,
+                                                 trace,
+                                                 ltt_time_infinite,
+                                                 NULL,
+                                                 background_ready_hook);
+        control_flow_data->background_info_waiting++;
+      } else { /* in progress */
+      
+        lttvwindowtraces_background_notify_current(control_flow_data,
+                                                   trace,
+                                                   ltt_time_infinite,
+                                                   NULL,
+                                                   background_ready_hook);
+        control_flow_data->background_info_waiting++;
+      }
+    } else {
+      /* Data ready. Be its nature, this viewer doesn't need to have
+       * its data ready hook called htere, because a background
+       * request is always linked with a redraw.
+       */
+    }
+    
+  }
+
+  lttv_hooks_destroy(background_ready_hook);
+}
+
+
+
+
 /**
  * Event Viewer's constructor hook
  *
  * This constructor is given as a parameter to the menuitem and toolbar button
  * registration. It creates the list.
- * @param mw A pointer to the parent window.
+ * @param tab A pointer to the parent tab.
  * @return The widget created.
  */
 GtkWidget *
-h_guicontrolflow(MainWindow *mw, LttvTracesetSelector * s, char * key)
+h_guicontrolflow(Tab *tab)
 {
-  g_info("h_guicontrolflow, %p, %p, %s", mw, s, key);
+  g_info("h_guicontrolflow, %p", tab);
   ControlFlowData *control_flow_data = guicontrolflow() ;
   
-  control_flow_data->mw = mw;
-  TimeWindow *time_window = guicontrolflow_get_time_window(control_flow_data);
-  time_window->start_time.tv_sec = 0;
-  time_window->start_time.tv_nsec = 0;
-  time_window->time_width.tv_sec = 0;
-  time_window->time_width.tv_nsec = 0;
-
-  LttTime *current_time = guicontrolflow_get_current_time(control_flow_data);
-  current_time->tv_sec = 0;
-  current_time->tv_nsec = 0;
+  control_flow_data->tab = tab;
   
-  //g_critical("time width1 : %u",time_window->time_width);
+  //g_debug("time width2 : %u",time_window->time_width);
+  // Unreg done in the GuiControlFlow_Destructor
+  lttvwindow_register_traceset_notify(tab,
+        traceset_notify,
+        control_flow_data);
+    
+  lttvwindow_register_time_window_notify(tab,
+                                         update_time_window_hook,
+                                         control_flow_data);
+  lttvwindow_register_current_time_notify(tab,
+                                          update_current_time_hook,
+                                          control_flow_data);
+  lttvwindow_register_redraw_notify(tab,
+                                    redraw_notify,
+                                    control_flow_data);
+  lttvwindow_register_continue_notify(tab,
+                                      continue_notify,
+                                      control_flow_data);
+  request_background_data(control_flow_data);
   
-  get_time_window(mw,
-      time_window);
-  get_current_time(mw,
-      current_time);
 
-  //g_critical("time width2 : %u",time_window->time_width);
-  // Unreg done in the GuiControlFlow_Destructor
-  reg_update_time_window(update_time_window_hook, control_flow_data,
-        mw);
-  reg_update_current_time(update_current_time_hook, control_flow_data,
-        mw);
   return guicontrolflow_get_widget(control_flow_data) ;
   
 }
@@ -102,34 +267,100 @@ int event_selected_hook(void *hook_data, void *call_data)
   ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
   guint *event_number = (guint*) call_data;
 
-  g_critical("DEBUG : event selected by main window : %u", *event_number);
+  g_debug("DEBUG : event selected by main window : %u", *event_number);
+  
+}
+
+/* Function that selects the color of status&exemode line */
+static __inline PropertiesLine prepare_s_e_line(LttvProcessState *process)
+{
+  PropertiesLine prop_line;
+  prop_line.line_width = 2;
+  prop_line.style = GDK_LINE_SOLID;
+  prop_line.y = MIDDLE;
+  //GdkColormap *colormap = gdk_colormap_get_system();
   
-//  control_flow_data->currently_Selected_Event = *event_number;
-//  control_flow_data->Selected_Event = TRUE ;
+  g_debug("prepare_status_line for state : %s",
+      g_quark_to_string(process->state->s));
+
+  if(process->state->s == LTTV_STATE_RUN) {
+    if(process->state->t == LTTV_STATE_USER_MODE)
+      prop_line.color = drawing_colors[COL_RUN_USER_MODE];
+    else if(process->state->t == LTTV_STATE_SYSCALL)
+      prop_line.color = drawing_colors[COL_RUN_SYSCALL];
+    else if(process->state->t == LTTV_STATE_TRAP)
+      prop_line.color = drawing_colors[COL_RUN_TRAP];
+    else if(process->state->t == LTTV_STATE_IRQ)
+      prop_line.color = drawing_colors[COL_RUN_IRQ];
+    else if(process->state->t == LTTV_STATE_MODE_UNKNOWN)
+      prop_line.color = drawing_colors[COL_MODE_UNKNOWN];
+    else
+      g_assert(FALSE);   /* RUNNING MODE UNKNOWN */
+  } else if(process->state->s == LTTV_STATE_WAIT) {
+    /* We don't show if we wait while in user mode, trap, irq or syscall */
+    prop_line.color = drawing_colors[COL_WAIT];
+  } else if(process->state->s == LTTV_STATE_WAIT_CPU) {
+    /* We don't show if we wait for CPU while in user mode, trap, irq
+     * or syscall */
+    prop_line.color = drawing_colors[COL_WAIT_CPU];
+  } else if(process->state->s == LTTV_STATE_ZOMBIE) {
+    prop_line.color = drawing_colors[COL_ZOMBIE];
+  } else if(process->state->s == LTTV_STATE_WAIT_FORK) {
+    prop_line.color = drawing_colors[COL_WAIT_FORK];
+  } else if(process->state->s == LTTV_STATE_EXIT) {
+    prop_line.color = drawing_colors[COL_EXIT];
+  } else if(process->state->s == LTTV_STATE_UNNAMED) {
+    prop_line.color = drawing_colors[COL_UNNAMED];
+  } else
+    g_assert(FALSE);   /* UNKNOWN STATE */
   
-//  tree_v_set_cursor(control_flow_data);
+  return prop_line;
 
 }
 
-/* Hook called before drawing. Gets the initial context at the beginning of the
- * drawing interval and copy it to the context in event_request.
- */
-int draw_before_hook(void *hook_data, void *call_data)
+#if 0
+static __inline PropertiesLine prepare_status_line(LttvProcessState *process)
 {
-  EventRequest *event_request = (EventRequest*)hook_data;
-  //EventsContext Events_Context = (EventsContext*)call_data;
+  PropertiesLine prop_line;
+  prop_line.line_width = 2;
+  prop_line.style = GDK_LINE_SOLID;
+  prop_line.y = MIDDLE;
+  //GdkColormap *colormap = gdk_colormap_get_system();
   
-  //event_request->Events_Context = Events_Context;
+  g_debug("prepare_status_line for state : %s",
+      g_quark_to_string(process->state->s));
+
+  /* color of line : status of the process */
+  if(process->state->s == LTTV_STATE_UNNAMED)
+    prop_line.color = drawing_colors[COL_WHITE];
+  else if(process->state->s == LTTV_STATE_WAIT_FORK)
+    prop_line.color = drawing_colors[COL_WAIT_FORK];
+  else if(process->state->s == LTTV_STATE_WAIT_CPU)
+    prop_line.color = drawing_colors[COL_WAIT_CPU];
+  else if(process->state->s == LTTV_STATE_EXIT)
+    prop_line.color = drawing_colors[COL_EXIT];
+  else if(process->state->s == LTTV_STATE_ZOMBIE)
+    prop_line.color = drawing_colors[COL_ZOMBIE];
+  else if(process->state->s == LTTV_STATE_WAIT)
+    prop_line.color = drawing_colors[COL_WAIT];
+  else if(process->state->s == LTTV_STATE_RUN)
+    prop_line.color = drawing_colors[COL_RUN];
+  else
+      prop_line.color = drawing_colors[COL_WHITE];
+  //gdk_colormap_alloc_color(colormap,
+  //                         prop_line.color,
+  //                         FALSE,
+  //                         TRUE);
+  
+  return prop_line;
 
-  return 0;
 }
+#endif //0
 
-/*
- * The draw event hook is called by the reading API to have a
- * particular event drawn on the screen.
- * @param hook_data ControlFlowData structure of the viewer. 
- * @param call_data Event context.
- *
+
+/* before_schedchange_hook
+ * 
  * This function basically draw lines and icons. Two types of lines are drawn :
  * one small (3 pixels?) representing the state of the process and the second
  * type is thicker (10 pixels?) representing on which CPU a process is running
@@ -144,22 +375,329 @@ int draw_before_hook(void *hook_data, void *call_data)
  * The choice of lines'color is defined by the context of the last event for this
  * process.
  */
-int draw_event_hook(void *hook_data, void *call_data)
+
+
+int before_schedchange_hook(void *hook_data, void *call_data)
 {
-  EventRequest *event_request = (EventRequest*)hook_data;
-  ControlFlowData *control_flow_data = event_request->control_flow_data;
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  Drawing_t *drawing = control_flow_data->drawing;
 
   LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
 
   LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+  guint width = drawing->width;
+
+  /* we are in a schedchange, before the state update. We must draw the
+   * items corresponding to the state before it changes : now is the right
+   * time to do it.
+   */
+
+  guint pid_out;
+  guint pid_in;
+  {
+    LttField *f = ltt_event_field(e);
+    LttField *element;
+    element = ltt_field_member(f,0);
+    pid_out = ltt_event_get_long_unsigned(e,element);
+    element = ltt_field_member(f,1);
+    pid_in = ltt_event_get_long_unsigned(e,element);
+    g_debug("out : %u  in : %u", pid_out, pid_in);
+  }
+  
+  { 
+    /* For the pid_out */
+    /* First, check if the current process is in the state computation
+     * process list. If it is there, that means we must add it right now and
+     * draw items from the beginning of the read for it. If it is not
+     * present, it's a new process and it was not present : it will
+     * be added after the state update.  */
+    LttvProcessState *process;
+    process = lttv_state_find_process(tfs, pid_out);
+    
+    if(process != NULL) {
+      /* Well, the process_out existed : we must get it in the process hash
+       * or add it, and draw its items.
+       */
+       /* Add process to process list (if not present) */
+      guint y = 0, height = 0, pl_height = 0;
+      HashedProcessData *hashed_process_data = NULL;
+      ProcessList *process_list = 
+                      guicontrolflow_get_process_list(control_flow_data);
+      LttTime birth = process->creation_time;
+      const gchar *name = g_quark_to_string(process->name);
+      
+      if(processlist_get_process_pixels(process_list,
+              pid_out,
+              process->last_cpu,
+              &birth,
+              tfc->t_context->index,
+              &y,
+              &height,
+              &hashed_process_data) == 1)
+      {
+        g_assert(pid_out == 0 || pid_out != process->ppid);
+        /* Process not present */
+        processlist_add(process_list,
+            pid_out,
+            process->last_cpu,
+            process->ppid,
+            &birth,
+            tfc->t_context->index,
+            name,
+            &pl_height,
+            &hashed_process_data);
+        processlist_get_process_pixels(process_list,
+                pid_out,
+                process->last_cpu,
+                &birth,
+                tfc->t_context->index,
+                &y,
+                &height,
+                &hashed_process_data);
+        drawing_insert_square( drawing, y, height);
+      }
+    
+      /* Now, the process is in the state hash and our own process hash.
+       * We definitely can draw the items related to the ending state.
+       */
+      
+      /* Check if the x position is unset. In can have been left unset by
+       * a draw closure from a after chunk hook. This should never happen,
+       * because it must be set by before chunk hook to the damage_begin
+       * value.
+       */
+      g_assert(hashed_process_data->x.middle != -1);
+      {
+        guint x;
+        convert_time_to_pixels(
+                  time_window.start_time,
+                  end_time,
+                  evtime,
+                  width,
+                  &x);
+
+
+        /* Jump over draw if we are at the same x position */
+        if(x == hashed_process_data->x.middle &&
+             hashed_process_data->x.middle_used)
+        {
+          if(hashed_process_data->x.middle_marked == FALSE) {
+            /* Draw collision indicator */
+            gdk_gc_set_foreground(drawing->gc, &drawing_colors[COL_WHITE]);
+            gdk_draw_point(drawing->pixmap,
+                           drawing->gc,
+                           x,
+                           y+1);
+          }
+          /* jump */
+        } else {
+          DrawContext draw_context;
+
+          /* Now create the drawing context that will be used to draw
+           * items related to the last state. */
+          draw_context.drawable = drawing->pixmap;
+          draw_context.gc = drawing->gc;
+          draw_context.pango_layout = drawing->pango_layout;
+          draw_context.drawinfo.start.x = hashed_process_data->x.middle;
+          draw_context.drawinfo.end.x = x;
+
+          draw_context.drawinfo.y.over = y+1;
+          draw_context.drawinfo.y.middle = y+(height/2);
+          draw_context.drawinfo.y.under = y+height;
+
+          draw_context.drawinfo.start.offset.over = 0;
+          draw_context.drawinfo.start.offset.middle = 0;
+          draw_context.drawinfo.start.offset.under = 0;
+          draw_context.drawinfo.end.offset.over = 0;
+          draw_context.drawinfo.end.offset.middle = 0;
+          draw_context.drawinfo.end.offset.under = 0;
+
+          {
+            /* Draw the line */
+            PropertiesLine prop_line = prepare_s_e_line(process);
+            draw_line((void*)&prop_line, (void*)&draw_context);
+
+          }
+          /* become the last x position */
+          hashed_process_data->x.middle = x;
+          hashed_process_data->x.middle_used = TRUE;
+          hashed_process_data->x.middle_marked = FALSE;
+        }
+      }
+    }
+  }
+
+  {
+    /* For the pid_in */
+    /* First, check if the current process is in the state computation
+     * process list. If it is there, that means we must add it right now and
+     * draw items from the beginning of the read for it. If it is not
+     * present, it's a new process and it was not present : it will
+     * be added after the state update.  */
+    LttvProcessState *process;
+    process = lttv_state_find_process(tfs, pid_in);
+    
+    if(process != NULL) {
+      /* Well, the process_out existed : we must get it in the process hash
+       * or add it, and draw its items.
+       */
+       /* Add process to process list (if not present) */
+      guint y = 0, height = 0, pl_height = 0;
+      HashedProcessData *hashed_process_data = NULL;
+      ProcessList *process_list = 
+                      guicontrolflow_get_process_list(control_flow_data);
+      LttTime birth = process->creation_time;
+      const gchar *name = g_quark_to_string(process->name);
+      
+      if(processlist_get_process_pixels(process_list,
+              pid_in,
+              process->last_cpu,
+              &birth,
+              tfc->t_context->index,
+              &y,
+              &height,
+              &hashed_process_data) == 1)
+      {
+        g_assert(pid_in == 0 || pid_in != process->ppid);
+        /* Process not present */
+        processlist_add(process_list,
+            pid_in,
+            process->last_cpu,
+            process->ppid,
+            &birth,
+            tfc->t_context->index,
+            name,
+            &pl_height,
+            &hashed_process_data);
+        processlist_get_process_pixels(process_list,
+                pid_in,
+                process->last_cpu,
+                &birth,
+                tfc->t_context->index,
+                &y,
+                &height,
+                &hashed_process_data);
+        drawing_insert_square( drawing, y, height);
+      }
+    
+      /* Now, the process is in the state hash and our own process hash.
+       * We definitely can draw the items related to the ending state.
+       */
+      
+      /* Check if the x position is unset. In can have been left unset by
+       * a draw closure from a after chunk hook. This should never happen,
+       * because it must be set by before chunk hook to the damage_begin
+       * value.
+       */
+      g_assert(hashed_process_data->x.middle != -1);
+      {
+        guint x;
+
+        convert_time_to_pixels(
+                  time_window.start_time,
+                  end_time,
+                  evtime,
+                  width,
+                  &x);
+
+
+        /* Jump over draw if we are at the same x position */
+        if(x == hashed_process_data->x.middle &&
+            hashed_process_data->x.middle_used)
+        {
+          if(hashed_process_data->x.middle_marked == FALSE) {
+            /* Draw collision indicator */
+            gdk_gc_set_foreground(drawing->gc, &drawing_colors[COL_WHITE]);
+            gdk_draw_point(drawing->pixmap,
+                           drawing->gc,
+                           x,
+                           y+1);
+          }
+          /* jump */
+        } else {
+          DrawContext draw_context;
+
+          /* Now create the drawing context that will be used to draw
+           * items related to the last state. */
+          draw_context.drawable = drawing->pixmap;
+          draw_context.gc = drawing->gc;
+          draw_context.pango_layout = drawing->pango_layout;
+          draw_context.drawinfo.start.x = hashed_process_data->x.middle;
+          draw_context.drawinfo.end.x = x;
+
+          draw_context.drawinfo.y.over = y+1;
+          draw_context.drawinfo.y.middle = y+(height/2);
+          draw_context.drawinfo.y.under = y+height;
+
+          draw_context.drawinfo.start.offset.over = 0;
+          draw_context.drawinfo.start.offset.middle = 0;
+          draw_context.drawinfo.start.offset.under = 0;
+          draw_context.drawinfo.end.offset.over = 0;
+          draw_context.drawinfo.end.offset.middle = 0;
+          draw_context.drawinfo.end.offset.under = 0;
+
+          {
+            /* Draw the line */
+            PropertiesLine prop_line = prepare_s_e_line(process);
+            draw_line((void*)&prop_line, (void*)&draw_context);
+          }
+
+          
+          /* become the last x position */
+          hashed_process_data->x.middle = x;
+          hashed_process_data->x.middle_used = TRUE;
+          hashed_process_data->x.middle_marked = FALSE;
+        }
+      }
+    }
+  }
+  return 0;
+
+
+#if 0
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = 
+                      (ControlFlowData*)events_request->viewer_data;
+  Tab *tab = control_flow_data->tab;
 
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
+
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
   
   LttEvent *e;
   e = tfc->e;
 
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+  //if(time < time_beg || time > time_end) return;
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
   if(strcmp(ltt_eventtype_name(ltt_event_eventtype(e)),"schedchange") == 0)
   {
-    g_critical("schedchange!");
+    g_debug("schedchange!");
     
     /* Add process to process list (if not present) and get drawing "y" from
      * process position */
@@ -169,7 +707,7 @@ int draw_event_hook(void *hook_data, void *call_data)
     guint y_in = 0, y_out = 0, height = 0, pl_height = 0;
 
     ProcessList *process_list =
-      guicontrolflow_get_process_list(event_request->control_flow_data);
+      guicontrolflow_get_process_list(control_flow_data);
 
 
     LttField *f = ltt_event_field(e);
@@ -178,96 +716,102 @@ int draw_event_hook(void *hook_data, void *call_data)
     pid_out = ltt_event_get_long_unsigned(e,element);
     element = ltt_field_member(f,1);
     pid_in = ltt_event_get_long_unsigned(e,element);
-    g_critical("out : %u  in : %u", pid_out, pid_in);
+    g_debug("out : %u  in : %u", pid_out, pid_in);
 
 
     /* Find process pid_out in the list... */
     process_out = lttv_state_find_process(tfs, pid_out);
-    g_critical("out : %s",g_quark_to_string(process_out->state->s));
-
+    if(process_out == NULL) return 0;
+    g_debug("out : %s",g_quark_to_string(process_out->state->s));
+    
     birth = process_out->creation_time;
-    gchar *name = strdup(g_quark_to_string(process_out->name));
+    const gchar *name = g_quark_to_string(process_out->name);
     HashedProcessData *hashed_process_data_out = NULL;
 
     if(processlist_get_process_pixels(process_list,
             pid_out,
             &birth,
+            tfc->t_context->index,
             &y_out,
             &height,
             &hashed_process_data_out) == 1)
     {
-    /* Process not present */
-    processlist_add(process_list,
-        pid_out,
-        &birth,
-        name,
-        &pl_height,
-        &hashed_process_data_out);
-    processlist_get_process_pixels(process_list,
-            pid_out,
-            &birth,
-            &y_out,
-            &height,
-            &hashed_process_data_out);
-    drawing_insert_square( event_request->control_flow_data->drawing, y_out, height);
+      /* Process not present */
+      processlist_add(process_list,
+          pid_out,
+          &birth,
+          tfc->t_context->index,
+          name,
+          &pl_height,
+          &hashed_process_data_out);
+      g_assert(processlist_get_process_pixels(process_list,
+              pid_out,
+              &birth,
+              tfc->t_context->index,
+              &y_out,
+              &height,
+              &hashed_process_data_out)==0);
+      drawing_insert_square( control_flow_data->drawing, y_out, height);
     }
-
-    g_free(name);
+    //g_free(name);
     
     /* Find process pid_in in the list... */
     process_in = lttv_state_find_process(tfs, pid_in);
-    g_critical("in : %s",g_quark_to_string(process_in->state->s));
+    if(process_in == NULL) return 0;
+    g_debug("in : %s",g_quark_to_string(process_in->state->s));
 
     birth = process_in->creation_time;
-    name = strdup(g_quark_to_string(process_in->name));
+    name = g_quark_to_string(process_in->name);
     HashedProcessData *hashed_process_data_in = NULL;
 
     if(processlist_get_process_pixels(process_list,
             pid_in,
             &birth,
+            tfc->t_context->index,
             &y_in,
             &height,
             &hashed_process_data_in) == 1)
     {
-    /* Process not present */
+      /* Process not present */
       processlist_add(process_list,
         pid_in,
         &birth,
+        tfc->t_context->index,
         name,
         &pl_height,
         &hashed_process_data_in);
       processlist_get_process_pixels(process_list,
             pid_in,
             &birth,
+            tfc->t_context->index,
             &y_in,
             &height,
             &hashed_process_data_in);
 
-      drawing_insert_square( event_request->control_flow_data->drawing, y_in, height);
+      drawing_insert_square( control_flow_data->drawing, y_in, height);
     }
-    g_free(name);
+    //g_free(name);
 
 
     /* Find pixels corresponding to time of the event. If the time does
      * not fit in the window, show a warning, not supposed to happend. */
     guint x = 0;
-    guint width = control_flow_data->drawing->drawing_area->allocation.width;
+    guint width = control_flow_data->drawing->width;
 
     LttTime time = ltt_event_time(e);
 
-    LttTime window_end = ltt_time_add(control_flow_data->time_window.time_width,
-                          control_flow_data->time_window.start_time);
+    LttTime window_end = ltt_time_add(time_window.time_width,
+                          time_window.start_time);
 
     
     convert_time_to_pixels(
-        control_flow_data->time_window.start_time,
+        time_window.start_time,
         window_end,
         time,
         width,
         &x);
-    
-    assert(x <= width);
-    
+    //assert(x <= width);
+    //
     /* draw what represents the event for outgoing process. */
 
     DrawContext *draw_context_out = hashed_process_data_out->draw_context;
@@ -279,13 +823,83 @@ int draw_event_hook(void *hook_data, void *call_data)
     draw_context_out->pango_layout = control_flow_data->drawing->pango_layout;
     GtkWidget *widget = control_flow_data->drawing->drawing_area;
     //draw_context_out->gc = widget->style->fg_gc[GTK_WIDGET_STATE (widget)];
-    draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
-    gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
+    //draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+    //gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
     //draw_context_out->gc = widget->style->black_gc;
     
     //draw_arc((void*)&prop_arc, (void*)draw_context_out);
     //test_draw_item(control_flow_data->drawing, control_flow_data->drawing->pixmap);
     
+    /* Draw the line/background of the out process */
+    if(draw_context_out->previous->middle->x == -1)
+    {
+      draw_context_out->previous->over->x =
+                            control_flow_data->drawing->damage_begin;
+      draw_context_out->previous->middle->x = 
+                            control_flow_data->drawing->damage_begin;
+      draw_context_out->previous->under->x =
+                            control_flow_data->drawing->damage_begin;
+
+      g_debug("out middle x_beg : %u",control_flow_data->drawing->damage_begin);
+    }
+  
+    draw_context_out->current->middle->x = x;
+    draw_context_out->current->over->x = x;
+    draw_context_out->current->under->x = x;
+    draw_context_out->current->middle->y = y_out + height/2;
+    draw_context_out->current->over->y = y_out;
+    draw_context_out->current->under->y = y_out + height;
+    draw_context_out->previous->middle->y = y_out + height/2;
+    draw_context_out->previous->over->y = y_out;
+    draw_context_out->previous->under->y = y_out + height;
+
+    draw_context_out->drawable = control_flow_data->drawing->pixmap;
+    draw_context_out->pango_layout = control_flow_data->drawing->pango_layout;
+
+    if(process_out->state->s == LTTV_STATE_RUN)
+    {
+      //draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+      //gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
+      draw_context_out->gc = control_flow_data->drawing->gc;
+
+      PropertiesBG prop_bg;
+      prop_bg.color = g_new(GdkColor,1);
+      
+      switch(tfc->index) {
+        case 0:
+          prop_bg.color->red = 0x1515;
+          prop_bg.color->green = 0x1515;
+          prop_bg.color->blue = 0x8c8c;
+          break;
+        case 1:
+          prop_bg.color->red = 0x4e4e;
+          prop_bg.color->green = 0xa9a9;
+          prop_bg.color->blue = 0xa4a4;
+          break;
+        case 2:
+          prop_bg.color->red = 0x7a7a;
+          prop_bg.color->green = 0x4a4a;
+          prop_bg.color->blue = 0x8b8b;
+          break;
+        case 3:
+          prop_bg.color->red = 0x8080;
+          prop_bg.color->green = 0x7777;
+          prop_bg.color->blue = 0x4747;
+          break;
+        default:
+          prop_bg.color->red = 0xe7e7;
+          prop_bg.color->green = 0xe7e7;
+          prop_bg.color->blue = 0xe7e7;
+      }
+      
+      g_debug("calling from draw_event");
+      draw_bg((void*)&prop_bg, (void*)draw_context_out);
+      g_free(prop_bg.color);
+      //gdk_gc_unref(draw_context_out->gc);
+    }
+
+    draw_context_out->gc = widget->style->black_gc;
+
     GdkColor colorfg_out = { 0, 0xffff, 0x0000, 0x0000 };
     GdkColor colorbg_out = { 0, 0x0000, 0x0000, 0x0000 };
     PropertiesText prop_text_out;
@@ -313,7 +927,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_out.foreground->green = 0xffff;
       prop_text_out.foreground->blue = 0x0000;
     }
-    else if(process_out->state->s == LTTV_STATE_EXIT)
+    else if(process_out->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_text_out.foreground->red = 0xffff;
       prop_text_out.foreground->green = 0x0000;
@@ -346,7 +960,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_out.text = "WF->";
     else if(process_out->state->s == LTTV_STATE_WAIT_CPU)
       prop_text_out.text = "WC->";
-    else if(process_out->state->s == LTTV_STATE_EXIT)
+    else if(process_out->state->s == LTTV_STATE_ZOMBIE)
       prop_text_out.text = "E->";
     else if(process_out->state->s == LTTV_STATE_WAIT)
       prop_text_out.text = "W->";
@@ -356,23 +970,11 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_out.text = "U";
     
     draw_text((void*)&prop_text_out, (void*)draw_context_out);
-    gdk_gc_unref(draw_context_out->gc);
+    //gdk_gc_unref(draw_context_out->gc);
 
-    /* Draw the line of the out process */
-    if(draw_context_out->previous->middle->x == -1)
-    {
-      draw_context_out->previous->middle->x = event_request->x_begin;
-      g_critical("out middle x_beg : %u",event_request->x_begin);
-    }
-  
-    draw_context_out->current->middle->x = x;
-    draw_context_out->current->middle->y = y_out + height/2;
-    draw_context_out->previous->middle->y = y_out + height/2;
-    draw_context_out->drawable = control_flow_data->drawing->pixmap;
-    draw_context_out->pango_layout = control_flow_data->drawing->pango_layout;
-    //draw_context_out->gc = widget->style->black_gc;
-    draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
-    gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
+    //draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+    //gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
+    draw_context_out->gc = control_flow_data->drawing->gc;
 
     PropertiesLine prop_line_out;
     prop_line_out.color = g_new(GdkColor,1);
@@ -380,7 +982,7 @@ int draw_event_hook(void *hook_data, void *call_data)
     prop_line_out.style = GDK_LINE_SOLID;
     prop_line_out.position = MIDDLE;
     
-    g_critical("out state : %s", g_quark_to_string(process_out->state->s));
+    g_debug("out state : %s", g_quark_to_string(process_out->state->s));
 
     /* color of line : status of the process */
     if(process_out->state->s == LTTV_STATE_UNNAMED)
@@ -401,7 +1003,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_line_out.color->green = 0xffff;
       prop_line_out.color->blue = 0x0000;
     }
-    else if(process_out->state->s == LTTV_STATE_EXIT)
+    else if(process_out->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_line_out.color->red = 0xffff;
       prop_line_out.color->green = 0x0000;
@@ -428,7 +1030,7 @@ int draw_event_hook(void *hook_data, void *call_data)
   
     draw_line((void*)&prop_line_out, (void*)draw_context_out);
     g_free(prop_line_out.color);
-    gdk_gc_unref(draw_context_out->gc);
+    //gdk_gc_unref(draw_context_out->gc);
     /* Note : finishing line will have to be added when trace read over. */
       
     /* Finally, update the drawing context of the pid_in. */
@@ -443,12 +1045,84 @@ int draw_event_hook(void *hook_data, void *call_data)
     widget = control_flow_data->drawing->drawing_area;
     //draw_context_in->gc = widget->style->fg_gc[GTK_WIDGET_STATE (widget)];
     //draw_context_in->gc = widget->style->black_gc;
-    draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
-    gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
+    //draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+    //gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
     
     //draw_arc((void*)&prop_arc, (void*)draw_context_in);
     //test_draw_item(control_flow_data->drawing, control_flow_data->drawing->pixmap);
+      
+    /* Draw the line/bg of the in process */
+    if(draw_context_in->previous->middle->x == -1)
+    {
+      draw_context_in->previous->over->x =
+                            control_flow_data->drawing->damage_begin;
+      draw_context_in->previous->middle->x = 
+                            control_flow_data->drawing->damage_begin;
+      draw_context_in->previous->under->x =
+                            control_flow_data->drawing->damage_begin;
+
+      g_debug("in middle x_beg : %u",control_flow_data->drawing->damage_begin);
+
+    }
+  
+    draw_context_in->current->middle->x = x;
+    draw_context_in->current->over->x = x;
+    draw_context_in->current->under->x = x;
+    draw_context_in->current->middle->y = y_in + height/2;
+    draw_context_in->current->over->y = y_in;
+    draw_context_in->current->under->y = y_in + height;
+    draw_context_in->previous->middle->y = y_in + height/2;
+    draw_context_in->previous->over->y = y_in;
+    draw_context_in->previous->under->y = y_in + height;
     
+    draw_context_in->drawable = control_flow_data->drawing->pixmap;
+    draw_context_in->pango_layout = control_flow_data->drawing->pango_layout;
+
+    if(process_in->state->s == LTTV_STATE_RUN)
+    {
+      //draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+      //gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
+      draw_context_in->gc = control_flow_data->drawing->gc;
+
+      PropertiesBG prop_bg;
+      prop_bg.color = g_new(GdkColor,1);
+        
+      switch(tfc->index) {
+        case 0:
+          prop_bg.color->red = 0x1515;
+          prop_bg.color->green = 0x1515;
+          prop_bg.color->blue = 0x8c8c;
+          break;
+        case 1:
+          prop_bg.color->red = 0x4e4e;
+          prop_bg.color->green = 0xa9a9;
+          prop_bg.color->blue = 0xa4a4;
+          break;
+        case 2:
+          prop_bg.color->red = 0x7a7a;
+          prop_bg.color->green = 0x4a4a;
+          prop_bg.color->blue = 0x8b8b;
+          break;
+        case 3:
+          prop_bg.color->red = 0x8080;
+          prop_bg.color->green = 0x7777;
+          prop_bg.color->blue = 0x4747;
+          break;
+        default:
+          prop_bg.color->red = 0xe7e7;
+          prop_bg.color->green = 0xe7e7;
+          prop_bg.color->blue = 0xe7e7;
+      }
+      
+
+      draw_bg((void*)&prop_bg, (void*)draw_context_in);
+      g_free(prop_bg.color);
+      //gdk_gc_unref(draw_context_in->gc);
+    }
+
+    draw_context_in->gc = widget->style->black_gc;
+
     GdkColor colorfg_in = { 0, 0x0000, 0xffff, 0x0000 };
     GdkColor colorbg_in = { 0, 0x0000, 0x0000, 0x0000 };
     PropertiesText prop_text_in;
@@ -457,7 +1131,7 @@ int draw_event_hook(void *hook_data, void *call_data)
     prop_text_in.size = 6;
     prop_text_in.position = OVER;
 
-    g_critical("in state : %s", g_quark_to_string(process_in->state->s));
+    g_debug("in state : %s", g_quark_to_string(process_in->state->s));
     /* foreground of text : status of the process */
     if(process_in->state->s == LTTV_STATE_UNNAMED)
     {
@@ -477,7 +1151,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_in.foreground->green = 0xffff;
       prop_text_in.foreground->blue = 0x0000;
     }
-    else if(process_in->state->s == LTTV_STATE_EXIT)
+    else if(process_in->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_text_in.foreground->red = 0xffff;
       prop_text_in.foreground->green = 0x0000;
@@ -511,7 +1185,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_in.text = "WF->";
     else if(process_in->state->s == LTTV_STATE_WAIT_CPU)
       prop_text_in.text = "WC->";
-    else if(process_in->state->s == LTTV_STATE_EXIT)
+    else if(process_in->state->s == LTTV_STATE_ZOMBIE)
       prop_text_in.text = "E->";
     else if(process_in->state->s == LTTV_STATE_WAIT)
       prop_text_in.text = "W->";
@@ -521,24 +1195,12 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_text_in.text = "U";
     
     draw_text((void*)&prop_text_in, (void*)draw_context_in);
-    gdk_gc_unref(draw_context_in->gc);
-    
-    /* Draw the line of the in process */
-    if(draw_context_in->previous->middle->x == -1)
-    {
-      draw_context_in->previous->middle->x = event_request->x_begin;
-      g_critical("in middle x_beg : %u",event_request->x_begin);
-    }
-  
-    draw_context_in->current->middle->x = x;
-    draw_context_in->previous->middle->y = y_in + height/2;
-    draw_context_in->current->middle->y = y_in + height/2;
-    draw_context_in->drawable = control_flow_data->drawing->pixmap;
-    draw_context_in->pango_layout = control_flow_data->drawing->pango_layout;
-    //draw_context_in->gc = widget->style->black_gc;
-    draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
-    gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
-    
+    //gdk_gc_unref(draw_context_in->gc);
+   
+    //draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+    //gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
+    draw_context_in->gc = control_flow_data->drawing->gc;
+
     PropertiesLine prop_line_in;
     prop_line_in.color = g_new(GdkColor,1);
     prop_line_in.line_width = 2;
@@ -564,7 +1226,7 @@ int draw_event_hook(void *hook_data, void *call_data)
       prop_line_in.color->green = 0xffff;
       prop_line_in.color->blue = 0x0000;
     }
-    else if(process_in->state->s == LTTV_STATE_EXIT)
+    else if(process_in->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_line_in.color->red = 0xffff;
       prop_line_in.color->green = 0x0000;
@@ -591,12 +1253,15 @@ int draw_event_hook(void *hook_data, void *call_data)
   
     draw_line((void*)&prop_line_in, (void*)draw_context_in);
     g_free(prop_line_in.color);
-    gdk_gc_unref(draw_context_in->gc);
+    //gdk_gc_unref(draw_context_in->gc);
   }
 
   return 0;
+#endif //0
+
 
-  /* Temp dump */
+
+  /* Text dump */
 #ifdef DONTSHOW
   GString *string = g_string_new("");;
   gboolean field_names = TRUE, state = TRUE;
@@ -618,47 +1283,177 @@ int draw_event_hook(void *hook_data, void *call_data)
 
 }
 
-
-int draw_after_hook(void *hook_data, void *call_data)
+/* after_schedchange_hook
+ * 
+ * The draw after hook is called by the reading API to have a
+ * particular event drawn on the screen.
+ * @param hook_data ControlFlowData structure of the viewer. 
+ * @param call_data Event context.
+ *
+ * This function adds items to be drawn in a queue for each process.
+ * 
+ */
+int after_schedchange_hook(void *hook_data, void *call_data)
 {
-  EventRequest *event_request = (EventRequest*)hook_data;
-  ControlFlowData *control_flow_data = event_request->control_flow_data;
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
 
   LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
 
   LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
 
-  
   LttEvent *e;
   e = tfc->e;
 
-  if(strcmp(ltt_eventtype_name(ltt_event_eventtype(e)),"schedchange") == 0)
-  {
-    g_critical("schedchange!");
-    
-    /* Add process to process list (if not present) and get drawing "y" from
-     * process position */
-    guint pid_out, pid_in;
-    LttvProcessState *process_out, *process_in;
-    LttTime birth;
-    guint y_in = 0, y_out = 0, height = 0, pl_height = 0;
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
 
-    ProcessList *process_list =
-      guicontrolflow_get_process_list(event_request->control_flow_data);
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
 
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
 
-    LttField *f = ltt_event_field(e);
-    LttField *element;
+  guint width = control_flow_data->drawing->width;
+
+  /* Add process to process list (if not present) */
+  LttvProcessState *process_out, *process_in;
+  LttTime birth;
+  guint y_in = 0, y_out = 0, height = 0, pl_height = 0;
+  HashedProcessData *hashed_process_data_in = NULL;
+
+  ProcessList *process_list =
+    guicontrolflow_get_process_list(control_flow_data);
+  
+  guint pid_in;
+  {
+    guint pid_out;
+    LttField *f = ltt_event_field(e);
+    LttField *element;
+    element = ltt_field_member(f,0);
+    pid_out = ltt_event_get_long_unsigned(e,element);
+    element = ltt_field_member(f,1);
+    pid_in = ltt_event_get_long_unsigned(e,element);
+    g_debug("out : %u  in : %u", pid_out, pid_in);
+  }
+
+
+  /* Find process pid_in in the list... */
+  process_in = lttv_state_find_process(tfs, pid_in);
+  /* It should exist, because we are after the state update. */
+  g_assert(process_in != NULL);
+
+  birth = process_in->creation_time;
+  const gchar *name = g_quark_to_string(process_in->name);
+
+  if(processlist_get_process_pixels(process_list,
+          pid_in,
+          process_in->last_cpu,
+          &birth,
+          tfc->t_context->index,
+          &y_in,
+          &height,
+          &hashed_process_data_in) == 1)
+  {
+    g_assert(pid_in == 0 || pid_in != process_in->ppid);
+    /* Process not present */
+    processlist_add(process_list,
+        pid_in,
+        process_in->last_cpu,
+        process_in->ppid,
+        &birth,
+        tfc->t_context->index,
+        name,
+        &pl_height,
+        &hashed_process_data_in);
+    processlist_get_process_pixels(process_list,
+            pid_in,
+            process_in->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y_in,
+            &height,
+            &hashed_process_data_in);
+    drawing_insert_square( control_flow_data->drawing, y_in, height);
+  }
+
+  guint new_x;
+  
+  convert_time_to_pixels(
+      time_window.start_time,
+      end_time,
+      evtime,
+      width,
+      &new_x);
+
+  if(hashed_process_data_in->x.middle != new_x) {
+    hashed_process_data_in->x.middle = new_x;
+    hashed_process_data_in->x.middle_used = FALSE;
+    hashed_process_data_in->x.middle_marked = FALSE;
+  }
+
+  return 0;
+
+
+
+
+
+#if 0
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
+
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+  //if(time < time_beg || time > time_end) return;
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
+
+  if(strcmp(ltt_eventtype_name(ltt_event_eventtype(e)),"schedchange") == 0)
+  {
+    g_debug("schedchange!");
+    
+    /* Add process to process list (if not present) and get drawing "y" from
+     * process position */
+    guint pid_out, pid_in;
+    LttvProcessState *process_out, *process_in;
+    LttTime birth;
+    guint y_in = 0, y_out = 0, height = 0, pl_height = 0;
+
+    ProcessList *process_list =
+      guicontrolflow_get_process_list(control_flow_data);
+
+
+    LttField *f = ltt_event_field(e);
+    LttField *element;
     element = ltt_field_member(f,0);
     pid_out = ltt_event_get_long_unsigned(e,element);
     element = ltt_field_member(f,1);
     pid_in = ltt_event_get_long_unsigned(e,element);
-    //g_critical("out : %u  in : %u", pid_out, pid_in);
+    //g_debug("out : %u  in : %u", pid_out, pid_in);
 
 
     /* Find process pid_out in the list... */
     process_out = lttv_state_find_process(tfs, pid_out);
-    //g_critical("out : %s",g_quark_to_string(process_out->state->s));
+    if(process_out == NULL) return 0;
+    //g_debug("out : %s",g_quark_to_string(process_out->state->s));
 
     birth = process_out->creation_time;
     gchar *name = strdup(g_quark_to_string(process_out->name));
@@ -667,31 +1462,35 @@ int draw_after_hook(void *hook_data, void *call_data)
     if(processlist_get_process_pixels(process_list,
             pid_out,
             &birth,
+            tfc->t_context->index,
             &y_out,
             &height,
             &hashed_process_data_out) == 1)
     {
-    /* Process not present */
-    processlist_add(process_list,
-        pid_out,
-        &birth,
-        name,
-        &pl_height,
-        &hashed_process_data_out);
-    processlist_get_process_pixels(process_list,
-            pid_out,
-            &birth,
-            &y_out,
-            &height,
-            &hashed_process_data_out);
-    drawing_insert_square( event_request->control_flow_data->drawing, y_out, height);
+      /* Process not present */
+      processlist_add(process_list,
+          pid_out,
+          &birth,
+          tfc->t_context->index,
+          name,
+          &pl_height,
+          &hashed_process_data_out);
+      processlist_get_process_pixels(process_list,
+              pid_out,
+              &birth,
+              tfc->t_context->index,
+              &y_out,
+              &height,
+              &hashed_process_data_out);
+      drawing_insert_square( control_flow_data->drawing, y_out, height);
     }
 
     g_free(name);
     
     /* Find process pid_in in the list... */
     process_in = lttv_state_find_process(tfs, pid_in);
-    //g_critical("in : %s",g_quark_to_string(process_in->state->s));
+    if(process_in == NULL) return 0;
+    //g_debug("in : %s",g_quark_to_string(process_in->state->s));
 
     birth = process_in->creation_time;
     name = strdup(g_quark_to_string(process_in->name));
@@ -700,6 +1499,7 @@ int draw_after_hook(void *hook_data, void *call_data)
     if(processlist_get_process_pixels(process_list,
             pid_in,
             &birth,
+            tfc->t_context->index,
             &y_in,
             &height,
             &hashed_process_data_in) == 1)
@@ -708,17 +1508,19 @@ int draw_after_hook(void *hook_data, void *call_data)
       processlist_add(process_list,
         pid_in,
         &birth,
+        tfc->t_context->index,
         name,
         &pl_height,
         &hashed_process_data_in);
       processlist_get_process_pixels(process_list,
             pid_in,
             &birth,
+            tfc->t_context->index,
             &y_in,
             &height,
             &hashed_process_data_in);
 
-      drawing_insert_square( event_request->control_flow_data->drawing, y_in, height);
+      drawing_insert_square( control_flow_data->drawing, y_in, height);
     }
     g_free(name);
 
@@ -730,12 +1532,12 @@ int draw_after_hook(void *hook_data, void *call_data)
 
     //LttTime time = ltt_event_time(e);
 
-    //LttTime window_end = ltt_time_add(control_flow_data->time_window.time_width,
-    //                      control_flow_data->time_window.start_time);
+    //LttTime window_end = ltt_time_add(time_window->time_width,
+    //                      time_window->start_time);
 
     
     //convert_time_to_pixels(
-    //    control_flow_data->time_window.start_time,
+    //    time_window->start_time,
     //    window_end,
     //    time,
     //    width,
@@ -753,11 +1555,28 @@ int draw_after_hook(void *hook_data, void *call_data)
     draw_context_out->pango_layout = control_flow_data->drawing->pango_layout;
     GtkWidget *widget = control_flow_data->drawing->drawing_area;
     //draw_context_out->gc = widget->style->fg_gc[GTK_WIDGET_STATE (widget)];
-    draw_context_out->gc = widget->style->black_gc;
-    
     //draw_arc((void*)&prop_arc, (void*)draw_context_out);
     //test_draw_item(control_flow_data->drawing, control_flow_data->drawing->pixmap);
-    
+     
+    /*if(process_out->state->s == LTTV_STATE_RUN)
+    {
+      draw_context_out->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+      gdk_gc_copy(draw_context_out->gc, widget->style->black_gc);
+      PropertiesBG prop_bg;
+      prop_bg.color = g_new(GdkColor,1);
+      
+      prop_bg.color->red = 0xffff;
+      prop_bg.color->green = 0xffff;
+      prop_bg.color->blue = 0xffff;
+      
+      draw_bg((void*)&prop_bg, (void*)draw_context_out);
+      g_free(prop_bg.color);
+      gdk_gc_unref(draw_context_out->gc);
+    }*/
+
+    draw_context_out->gc = widget->style->black_gc;
+
     GdkColor colorfg_out = { 0, 0xffff, 0x0000, 0x0000 };
     GdkColor colorbg_out = { 0, 0x0000, 0x0000, 0x0000 };
     PropertiesText prop_text_out;
@@ -785,7 +1604,7 @@ int draw_after_hook(void *hook_data, void *call_data)
       prop_text_out.foreground->green = 0xffff;
       prop_text_out.foreground->blue = 0x0000;
     }
-    else if(process_out->state->s == LTTV_STATE_EXIT)
+    else if(process_out->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_text_out.foreground->red = 0xffff;
       prop_text_out.foreground->green = 0x0000;
@@ -817,7 +1636,7 @@ int draw_after_hook(void *hook_data, void *call_data)
       prop_text_out.text = "WF";
     else if(process_out->state->s == LTTV_STATE_WAIT_CPU)
       prop_text_out.text = "WC";
-    else if(process_out->state->s == LTTV_STATE_EXIT)
+    else if(process_out->state->s == LTTV_STATE_ZOMBIE)
       prop_text_out.text = "E";
     else if(process_out->state->s == LTTV_STATE_WAIT)
       prop_text_out.text = "W";
@@ -827,8 +1646,12 @@ int draw_after_hook(void *hook_data, void *call_data)
       prop_text_out.text = "U";
     
     draw_text((void*)&prop_text_out, (void*)draw_context_out);
+
+    //gdk_gc_unref(draw_context_out->gc);
  
     draw_context_out->current->middle->y = y_out+height/2;
+    draw_context_out->current->over->y = y_out;
+    draw_context_out->current->under->y = y_out+height;
     draw_context_out->current->status = process_out->state->s;
     
     /* for pid_out : remove previous, Prev = current, new current (default) */
@@ -873,11 +1696,28 @@ int draw_after_hook(void *hook_data, void *call_data)
     draw_context_in->pango_layout = control_flow_data->drawing->pango_layout;
     widget = control_flow_data->drawing->drawing_area;
     //draw_context_in->gc = widget->style->fg_gc[GTK_WIDGET_STATE (widget)];
-    draw_context_in->gc = widget->style->black_gc;
     
     //draw_arc((void*)&prop_arc, (void*)draw_context_in);
     //test_draw_item(control_flow_data->drawing, control_flow_data->drawing->pixmap);
-    
+     
+    /*if(process_in->state->s == LTTV_STATE_RUN)
+    {
+      draw_context_in->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
+      gdk_gc_copy(draw_context_in->gc, widget->style->black_gc);
+      PropertiesBG prop_bg;
+      prop_bg.color = g_new(GdkColor,1);
+      
+      prop_bg.color->red = 0xffff;
+      prop_bg.color->green = 0xffff;
+      prop_bg.color->blue = 0xffff;
+      
+      draw_bg((void*)&prop_bg, (void*)draw_context_in);
+      g_free(prop_bg.color);
+      gdk_gc_unref(draw_context_in->gc);
+    }*/
+
+    draw_context_in->gc = widget->style->black_gc;
+
     GdkColor colorfg_in = { 0, 0x0000, 0xffff, 0x0000 };
     GdkColor colorbg_in = { 0, 0x0000, 0x0000, 0x0000 };
     PropertiesText prop_text_in;
@@ -905,7 +1745,7 @@ int draw_after_hook(void *hook_data, void *call_data)
       prop_text_in.foreground->green = 0xffff;
       prop_text_in.foreground->blue = 0x0000;
     }
-    else if(process_in->state->s == LTTV_STATE_EXIT)
+    else if(process_in->state->s == LTTV_STATE_ZOMBIE)
     {
       prop_text_in.foreground->red = 0xffff;
       prop_text_in.foreground->green = 0x0000;
@@ -938,7 +1778,7 @@ int draw_after_hook(void *hook_data, void *call_data)
       prop_text_in.text = "WF";
     else if(process_in->state->s == LTTV_STATE_WAIT_CPU)
       prop_text_in.text = "WC";
-    else if(process_in->state->s == LTTV_STATE_EXIT)
+    else if(process_in->state->s == LTTV_STATE_ZOMBIE)
       prop_text_in.text = "E";
     else if(process_in->state->s == LTTV_STATE_WAIT)
       prop_text_in.text = "W";
@@ -949,6 +1789,7 @@ int draw_after_hook(void *hook_data, void *call_data)
     
     draw_text((void*)&prop_text_in, (void*)draw_context_in);
     
+
     if(process_in->state->s == LTTV_STATE_RUN)
     { 
       gchar tmp[255];
@@ -971,6 +1812,8 @@ int draw_after_hook(void *hook_data, void *call_data)
 
     
     draw_context_in->current->middle->y = y_in+height/2;
+    draw_context_in->current->over->y = y_in;
+    draw_context_in->current->under->y = y_in+height;
     draw_context_in->current->status = process_in->state->s;
 
     /* for pid_in : remove previous, Prev = current, new current (default) */
@@ -1008,202 +1851,897 @@ int draw_after_hook(void *hook_data, void *call_data)
   }
 
   return 0;
+#endif //0
 }
 
+#if 0
+static __inline PropertiesLine prepare_execmode_line(LttvProcessState *process)
+{
+  PropertiesLine prop_line;
+  prop_line.line_width = 1;
+  prop_line.style = GDK_LINE_SOLID;
+  prop_line.y = OVER;
+  //GdkColormap *colormap = gdk_colormap_get_system();
+  
+  /* color of line : execution mode of the process */
+  if(process->state->t == LTTV_STATE_USER_MODE)
+    prop_line.color = drawing_colors[COL_USER_MODE];
+  else if(process->state->t == LTTV_STATE_SYSCALL)
+    prop_line.color = drawing_colors[COL_SYSCALL];
+  else if(process->state->t == LTTV_STATE_TRAP)
+    prop_line.color = drawing_colors[COL_TRAP];
+  else if(process->state->t == LTTV_STATE_IRQ)
+    prop_line.color = drawing_colors[COL_IRQ];
+  else if(process->state->t == LTTV_STATE_MODE_UNKNOWN)
+    prop_line.color = drawing_colors[COL_MODE_UNKNOWN];
+  else
+    prop_line.color = drawing_colors[COL_WHITE];
+  //gdk_colormap_alloc_color(colormap,
+  //                         prop_line.color,
+  //                         FALSE,
+  //                         TRUE);
+  
+  return prop_line;
 
+}
+#endif //0
 
 
-gint update_time_window_hook(void *hook_data, void *call_data)
+/* before_execmode_hook
+ * 
+ * This function basically draw lines and icons. Two types of lines are drawn :
+ * one small (3 pixels?) representing the state of the process and the second
+ * type is thicker (10 pixels?) representing on which CPU a process is running
+ * (and this only in running state).
+ *
+ * Extremums of the lines :
+ * x_min : time of the last event context for this process kept in memory.
+ * x_max : time of the current event.
+ * y : middle of the process in the process list. The process is found in the
+ * list, therefore is it's position in pixels.
+ *
+ * The choice of lines'color is defined by the context of the last event for this
+ * process.
+ */
+
+
+int before_execmode_hook(void *hook_data, void *call_data)
 {
-  ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
-  TimeWindow *old_time_window = 
-    guicontrolflow_get_time_window(control_flow_data);
-  TimeWindow *new_time_window = ((TimeWindow*)call_data);
-  
-  /* Update the ruler */
-  drawing_update_ruler(control_flow_data->drawing,
-                       new_time_window);
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  Drawing_t *drawing = control_flow_data->drawing;
 
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
 
-  /* Two cases : zoom in/out or scrolling */
-  
-  /* In order to make sure we can reuse the old drawing, the scale must
-   * be the same and the new time interval being partly located in the
-   * currently shown time interval. (reuse is only for scrolling)
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
+  guint width = drawing->width;
+
+  /* we are in a execmode, before the state update. We must draw the
+   * items corresponding to the state before it changes : now is the right
+   * time to do it.
    */
+  /* For the pid */
+  LttvProcessState *process = tfs->process;
+  g_assert(process != NULL);
 
-  g_info("Old time window HOOK : %u, %u to %u, %u",
-      old_time_window->start_time.tv_sec,
-      old_time_window->start_time.tv_nsec,
-      old_time_window->time_width.tv_sec,
-      old_time_window->time_width.tv_nsec);
+  guint pid = process->pid;
 
-  g_info("New time window HOOK : %u, %u to %u, %u",
-      new_time_window->start_time.tv_sec,
-      new_time_window->start_time.tv_nsec,
-      new_time_window->time_width.tv_sec,
-      new_time_window->time_width.tv_nsec);
+  /* Well, the process_out existed : we must get it in the process hash
+   * or add it, and draw its items.
+   */
+   /* Add process to process list (if not present) */
+  guint y = 0, height = 0, pl_height = 0;
+  HashedProcessData *hashed_process_data = NULL;
+  ProcessList *process_list = 
+                  guicontrolflow_get_process_list(control_flow_data);
+  LttTime birth = process->creation_time;
+  const gchar *name = g_quark_to_string(process->name);
+  
+  if(processlist_get_process_pixels(process_list,
+          pid,
+          process->last_cpu,
+          &birth,
+          tfc->t_context->index,
+          &y,
+          &height,
+          &hashed_process_data) == 1)
+  {
+    g_assert(pid == 0 || pid != process->ppid);
+    /* Process not present */
+    processlist_add(process_list,
+        pid,
+        process->last_cpu,
+        process->ppid,
+        &birth,
+        tfc->t_context->index,
+        name,
+        &pl_height,
+        &hashed_process_data);
+    processlist_get_process_pixels(process_list,
+            pid,
+            process->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y,
+            &height,
+            &hashed_process_data);
+    drawing_insert_square( drawing, y, height);
+  }
 
-  if( new_time_window->time_width.tv_sec == old_time_window->time_width.tv_sec
-  && new_time_window->time_width.tv_nsec == old_time_window->time_width.tv_nsec)
+  /* Now, the process is in the state hash and our own process hash.
+   * We definitely can draw the items related to the ending state.
+   */
+  
+  /* Check if the x position is unset. In can have been left unset by
+   * a draw closure from a after chunk hook. This should never happen,
+   * because it must be set by before chunk hook to the damage_begin
+   * value.
+   */
+  g_assert(hashed_process_data->x.over != -1);
   {
-    /* Same scale (scrolling) */
-    g_info("scrolling");
-    LttTime *ns = &new_time_window->start_time;
-    LttTime *os = &old_time_window->start_time;
-    LttTime old_end = ltt_time_add(old_time_window->start_time,
-                                    old_time_window->time_width);
-    LttTime new_end = ltt_time_add(new_time_window->start_time,
-                                    new_time_window->time_width);
-    //if(ns<os+w<ns+w)
-    //if(ns<os+w && os+w<ns+w)
-    //if(ns<old_end && os<ns)
-    if(ltt_time_compare(*ns, old_end) == -1
-        && ltt_time_compare(*os, *ns) == -1)
-    {
-      g_info("scrolling near right");
-      /* Scroll right, keep right part of the screen */
-      guint x = 0;
-      guint width = control_flow_data->drawing->drawing_area->allocation.width;
-      convert_time_to_pixels(
-          *os,
-          old_end,
-          *ns,
-          width,
-          &x);
+    guint x;
 
-      /* Copy old data to new location */
-      gdk_draw_drawable (control_flow_data->drawing->pixmap,
-          control_flow_data->drawing->drawing_area->style->black_gc,
-          control_flow_data->drawing->pixmap,
-          x, 0,
-          0, 0,
-          -1, -1);
-      
-      convert_time_to_pixels(
-          *ns,
-          new_end,
-          old_end,
-          width,
-          &x);
+    convert_time_to_pixels(
+        time_window.start_time,
+        end_time,
+        evtime,
+        width,
+        &x);
 
-      *old_time_window = *new_time_window;
-      /* Clear the data request background, but not SAFETY */
-      gdk_draw_rectangle (control_flow_data->drawing->pixmap,
-          control_flow_data->drawing->drawing_area->style->black_gc,
-          TRUE,
-          x+SAFETY, 0,
-          control_flow_data->drawing->width - x,  // do not overlap
-          control_flow_data->drawing->height+SAFETY);
-      /* Get new data for the rest. */
-      drawing_data_request(control_flow_data->drawing,
-          &control_flow_data->drawing->pixmap,
-          x, 0,
-          control_flow_data->drawing->width - x,
-          control_flow_data->drawing->height);
-  
-      drawing_refresh(control_flow_data->drawing,
-          0, 0,
-          control_flow_data->drawing->width,
-          control_flow_data->drawing->height);
 
+    /* Jump over draw if we are at the same x position */
+    if(x == hashed_process_data->x.middle &&
+             hashed_process_data->x.middle_used)
+    {
+      if(hashed_process_data->x.middle_marked == FALSE) {
+        /* Draw collision indicator */
+        gdk_gc_set_foreground(drawing->gc, &drawing_colors[COL_WHITE]);
+        gdk_draw_point(drawing->pixmap,
+                       drawing->gc,
+                       x,
+                       y+1);
+      }
+      /* jump */
+    } else {
+
+      DrawContext draw_context;
+      /* Now create the drawing context that will be used to draw
+       * items related to the last state. */
+      draw_context.drawable = drawing->pixmap;
+      draw_context.gc = drawing->gc;
+      draw_context.pango_layout = drawing->pango_layout;
+      draw_context.drawinfo.start.x = hashed_process_data->x.middle;
+      draw_context.drawinfo.end.x = x;
+
+      draw_context.drawinfo.y.over = y+1;
+      draw_context.drawinfo.y.middle = y+(height/2);
+      draw_context.drawinfo.y.under = y+height;
+
+      draw_context.drawinfo.start.offset.over = 0;
+      draw_context.drawinfo.start.offset.middle = 0;
+      draw_context.drawinfo.start.offset.under = 0;
+      draw_context.drawinfo.end.offset.over = 0;
+      draw_context.drawinfo.end.offset.middle = 0;
+      draw_context.drawinfo.end.offset.under = 0;
 
-    } else { 
-      //if(ns<os<ns+w)
-      //if(ns<os && os<ns+w)
-      //if(ns<os && os<new_end)
-      if(ltt_time_compare(*ns,*os) == -1
-          && ltt_time_compare(*os,new_end) == -1)
       {
-        g_info("scrolling near left");
-        /* Scroll left, keep left part of the screen */
-        guint x = 0;
-        guint width = control_flow_data->drawing->drawing_area->allocation.width;
-        convert_time_to_pixels(
-            *ns,
-            new_end,
-            *os,
-            width,
-            &x);
-  
-        /* Copy old data to new location */
-        gdk_draw_drawable (control_flow_data->drawing->pixmap,
-            control_flow_data->drawing->drawing_area->style->black_gc,
-            control_flow_data->drawing->pixmap,
-            0, 0,
-            x, 0,
-            -1, -1);
+        /* Draw the line */
+        PropertiesLine prop_line = prepare_s_e_line(process);
+        draw_line((void*)&prop_line, (void*)&draw_context);
+
+      }
+      /* become the last x position */
+      hashed_process_data->x.middle = x;
+      hashed_process_data->x.middle_used = TRUE;
+      hashed_process_data->x.middle_marked = FALSE;
+    }
+  }
   
-        *old_time_window = *new_time_window;
+  return 0;
+}
 
-        /* Clean the data request background */
-        gdk_draw_rectangle (control_flow_data->drawing->pixmap,
-          control_flow_data->drawing->drawing_area->style->black_gc,
-          TRUE,
-          0, 0,
-          x,  // do not overlap
-          control_flow_data->drawing->height+SAFETY);
-        /* Get new data for the rest. */
-        drawing_data_request(control_flow_data->drawing,
-            &control_flow_data->drawing->pixmap,
-            0, 0,
-            x,
-            control_flow_data->drawing->height);
+/* after_execmode_hook
+ * 
+ * The draw after hook is called by the reading API to have a
+ * particular event drawn on the screen.
+ * @param hook_data ControlFlowData structure of the viewer. 
+ * @param call_data Event context.
+ *
+ * This function adds items to be drawn in a queue for each process.
+ * 
+ */
+int after_execmode_hook(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
+
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
+  guint width = control_flow_data->drawing->width;
+
+  /* Add process to process list (if not present) */
+  LttvProcessState *process;
+  LttTime birth;
+  guint y = 0, height = 0, pl_height = 0;
+  HashedProcessData *hashed_process_data = NULL;
+
+  ProcessList *process_list =
+    guicontrolflow_get_process_list(control_flow_data);
+  
+
+  /* Find process pid_in in the list... */
+  process = tfs->process;
+  /* It should exist, because we are after the state update. */
+  g_assert(process != NULL);
+
+  guint pid = process->pid;
+
+  birth = process->creation_time;
+  const gchar *name = g_quark_to_string(process->name);
+
+  if(processlist_get_process_pixels(process_list,
+          pid,
+          process->last_cpu,
+          &birth,
+          tfc->t_context->index,
+          &y,
+          &height,
+          &hashed_process_data) == 1)
+  {
+    g_assert(pid == 0 || pid != process->ppid);
+    /* Process not present */
+    processlist_add(process_list,
+        pid,
+        process->last_cpu,
+        process->ppid,
+        &birth,
+        tfc->t_context->index,
+        name,
+        &pl_height,
+        &hashed_process_data);
+    processlist_get_process_pixels(process_list,
+            pid,
+            process->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y,
+            &height,
+            &hashed_process_data);
+    drawing_insert_square( control_flow_data->drawing, y, height);
+  }
+  
+  guint new_x;
+  
+  convert_time_to_pixels(
+      time_window.start_time,
+      end_time,
+      evtime,
+      width,
+      &new_x);
+
+  if(hashed_process_data->x.middle != new_x) {
+    hashed_process_data->x.middle = new_x;
+    hashed_process_data->x.middle_used = FALSE;
+    hashed_process_data->x.middle_marked = FALSE;
+  }
+
+  return 0;
+}
+
+
+
+/* before_process_hook
+ * 
+ * Draw lines for process event.
+ *
+ * @param hook_data ControlFlowData structure of the viewer. 
+ * @param call_data Event context.
+ *
+ * This function adds items to be drawn in a queue for each process.
+ * 
+ */
+int before_process_hook(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  Drawing_t *drawing = control_flow_data->drawing;
+
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
+
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
+  guint width = control_flow_data->drawing->width;
+
+  guint sub_id;
+  {
+    LttField *f = ltt_event_field(e);
+    LttField *element;
+    element = ltt_field_member(f,0);
+    sub_id = ltt_event_get_long_unsigned(e,element);
+  }
+
+  if(sub_id == 3) { /* exit */
+
+    /* Add process to process list (if not present) */
+    LttvProcessState *process = tfs->process;
+    guint pid = process->pid;
+    LttTime birth;
+    guint y = 0, height = 0, pl_height = 0;
+    HashedProcessData *hashed_process_data = NULL;
+
+    ProcessList *process_list =
+      guicontrolflow_get_process_list(control_flow_data);
     
-        drawing_refresh(control_flow_data->drawing,
-            0, 0,
-            control_flow_data->drawing->width,
-            control_flow_data->drawing->height);
-        
+    g_assert(process != NULL);
+
+    birth = process->creation_time;
+    const gchar *name = g_quark_to_string(process->name);
+
+    if(processlist_get_process_pixels(process_list,
+            pid,
+            process->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y,
+            &height,
+            &hashed_process_data) == 1)
+    {
+      g_assert(pid == 0 || pid != process->ppid);
+      /* Process not present */
+      processlist_add(process_list,
+          pid,
+          process->last_cpu,
+          process->ppid,
+          &birth,
+          tfc->t_context->index,
+          name,
+          &pl_height,
+          &hashed_process_data);
+      processlist_get_process_pixels(process_list,
+              pid,
+              process->last_cpu,
+              &birth,
+              tfc->t_context->index,
+              &y,
+              &height,
+              &hashed_process_data);
+      drawing_insert_square( control_flow_data->drawing, y, height);
+    }
+
+    /* Now, the process is in the state hash and our own process hash.
+     * We definitely can draw the items related to the ending state.
+     */
+    
+    /* Check if the x position is unset. In can have been left unset by
+     * a draw closure from a after chunk hook. This should never happen,
+     * because it must be set by before chunk hook to the damage_begin
+     * value.
+     */
+    g_assert(hashed_process_data->x.over != -1);
+    {
+      guint x;
+
+      convert_time_to_pixels(
+          time_window.start_time,
+          end_time,
+          evtime,
+          width,
+          &x);
+
+
+      /* Jump over draw if we are at the same x position */
+      if(x == hashed_process_data->x.middle &&
+             hashed_process_data->x.middle_used)
+      { 
+        if(hashed_process_data->x.middle_marked == FALSE) {
+          /* Draw collision indicator */
+          gdk_gc_set_foreground(drawing->gc, &drawing_colors[COL_WHITE]);
+          gdk_draw_point(drawing->pixmap,
+                         drawing->gc,
+                         x,
+                         y+1);
+        }
+        /* jump */
       } else {
-        g_info("scrolling far");
-        /* Cannot reuse any part of the screen : far jump */
-        *old_time_window = *new_time_window;
+        DrawContext draw_context;
+
+        /* Now create the drawing context that will be used to draw
+         * items related to the last state. */
+        draw_context.drawable = drawing->pixmap;
+        draw_context.gc = drawing->gc;
+        draw_context.pango_layout = drawing->pango_layout;
+        draw_context.drawinfo.start.x = hashed_process_data->x.middle;
+        draw_context.drawinfo.end.x = x;
+
+        draw_context.drawinfo.y.over = y+1;
+        draw_context.drawinfo.y.middle = y+(height/2);
+        draw_context.drawinfo.y.under = y+height;
+
+        draw_context.drawinfo.start.offset.over = 0;
+        draw_context.drawinfo.start.offset.middle = 0;
+        draw_context.drawinfo.start.offset.under = 0;
+        draw_context.drawinfo.end.offset.over = 0;
+        draw_context.drawinfo.end.offset.middle = 0;
+        draw_context.drawinfo.end.offset.under = 0;
+
+        {
+          /* Draw the line */
+          PropertiesLine prop_line = prepare_s_e_line(process);
+          draw_line((void*)&prop_line, (void*)&draw_context);
+
+        }
+        /* become the last x position */
+        hashed_process_data->x.middle = x;
+        hashed_process_data->x.middle_used = TRUE;
+        hashed_process_data->x.middle_marked = FALSE;
+      }
+    }
+
+  }
+  return 0;
+
+}
+
+
+
+
+
+
+/* after_process_hook
+ * 
+ * Create the processlist entry for the child process. Put the last
+ * position in x at the current time value.
+ *
+ * @param hook_data ControlFlowData structure of the viewer. 
+ * @param call_data Event context.
+ *
+ * This function adds items to be drawn in a queue for each process.
+ * 
+ */
+int after_process_hook(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+
+  LttvTracefileContext *tfc = (LttvTracefileContext *)call_data;
+
+  LttvTracefileState *tfs = (LttvTracefileState *)call_data;
+  LttvTraceState *ts =(LttvTraceState *)LTTV_TRACEFILE_CONTEXT(tfs)->t_context;
+
+  LttEvent *e;
+  e = tfc->e;
+
+  LttTime evtime = ltt_event_time(e);
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
+
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
+
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
+
+  guint width = control_flow_data->drawing->width;
+
+  guint sub_id;
+  guint param1;
+  {
+    LttField *f = ltt_event_field(e);
+    LttField *element;
+    element = ltt_field_member(f,0);
+    sub_id = ltt_event_get_long_unsigned(e,element);
+    element = ltt_field_member(f,1);
+    param1 = ltt_event_get_long_unsigned(e,element);
+  }
+
+  if(sub_id == 2) { /* fork */
+    
+    guint child_pid = param1;
+    /* Add process to process list (if not present) */
+    LttvProcessState *process_child;
+    LttTime birth;
+    guint y_child = 0, height = 0, pl_height = 0;
+    HashedProcessData *hashed_process_data_child = NULL;
+
+    ProcessList *process_list =
+      guicontrolflow_get_process_list(control_flow_data);
+    
+
+    /* Find child in the list... */
+    process_child = lttv_state_find_process(tfs, child_pid);
+    /* It should exist, because we are after the state update. */
+    g_assert(process_child != NULL);
+
+    birth = process_child->creation_time;
+    const gchar *name = g_quark_to_string(process_child->name);
+
+    if(processlist_get_process_pixels(process_list,
+            child_pid,
+            process_child->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y_child,
+            &height,
+            &hashed_process_data_child) == 1)
+    {
+      g_assert(child_pid == 0 || child_pid != process_child->ppid);
+      /* Process not present */
+      processlist_add(process_list,
+          child_pid,
+          process_child->last_cpu,
+          process_child->ppid,
+          &birth,
+          tfc->t_context->index,
+          name,
+          &pl_height,
+          &hashed_process_data_child);
+      processlist_get_process_pixels(process_list,
+              child_pid,
+              process_child->last_cpu,
+              &birth,
+              tfc->t_context->index,
+              &y_child,
+              &height,
+              &hashed_process_data_child);
+      drawing_insert_square( control_flow_data->drawing, y_child, height);
+    }
+
+    guint new_x;
+    convert_time_to_pixels(
+        time_window.start_time,
+        end_time,
+        evtime,
+        width,
+        &new_x);
+
+    if(hashed_process_data_child->x.over != new_x) {
+      hashed_process_data_child->x.over = new_x;
+      hashed_process_data_child->x.over_used = FALSE;
+      hashed_process_data_child->x.over_marked = FALSE;
+    }
+    if(hashed_process_data_child->x.middle != new_x) {
+      hashed_process_data_child->x.middle = new_x;
+      hashed_process_data_child->x.middle_used = FALSE;
+      hashed_process_data_child->x.middle_marked = FALSE;
+    }
+    if(hashed_process_data_child->x.under != new_x) {
+      hashed_process_data_child->x.under = new_x;
+      hashed_process_data_child->x.under_used = FALSE;
+      hashed_process_data_child->x.under_marked = FALSE;
+    }
+
+  } else if(sub_id == 3) { /* exit */
+
+    /* Add process to process list (if not present) */
+    LttvProcessState *process = tfs->process;
+    guint pid = process->pid;
+    LttTime birth;
+    guint y = 0, height = 0, pl_height = 0;
+    HashedProcessData *hashed_process_data = NULL;
+
+    ProcessList *process_list =
+      guicontrolflow_get_process_list(control_flow_data);
+    
+
+    /* It should exist, because we are after the state update. */
+    g_assert(process != NULL);
+
+    birth = process->creation_time;
+    const gchar *name = g_quark_to_string(process->name);
+
+    if(processlist_get_process_pixels(process_list,
+            pid,
+            process->last_cpu,
+            &birth,
+            tfc->t_context->index,
+            &y,
+            &height,
+            &hashed_process_data) == 1)
+    {
+      g_assert(pid == 0 || pid != process->ppid);
+      /* Process not present */
+      processlist_add(process_list,
+          pid,
+          process->last_cpu,
+          process->ppid,
+          &birth,
+          tfc->t_context->index,
+          name,
+          &pl_height,
+          &hashed_process_data);
+      processlist_get_process_pixels(process_list,
+              pid,
+              process->last_cpu,
+              &birth,
+              tfc->t_context->index,
+              &y,
+              &height,
+              &hashed_process_data);
+      drawing_insert_square( control_flow_data->drawing, y, height);
+    }
+
+    guint new_x;
+    convert_time_to_pixels(
+        time_window.start_time,
+        end_time,
+        evtime,
+        width,
+        &new_x);
+    if(hashed_process_data->x.middle != new_x) {
+      hashed_process_data->x.middle = new_x;
+      hashed_process_data->x.middle_used = FALSE;
+      hashed_process_data->x.middle_marked = FALSE;
+    }
+
+
+  }
+  return 0;
+
+}
+
+
+gint update_time_window_hook(void *hook_data, void *call_data)
+{
+  ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
+  Drawing_t *drawing = control_flow_data->drawing;
+
+  const TimeWindowNotifyData *time_window_nofify_data = 
+                          ((const TimeWindowNotifyData *)call_data);
+
+  TimeWindow *old_time_window = 
+    time_window_nofify_data->old_time_window;
+  TimeWindow *new_time_window = 
+    time_window_nofify_data->new_time_window;
+  
+  /* Update the ruler */
+  drawing_update_ruler(control_flow_data->drawing,
+                       new_time_window);
+
+
+  /* Two cases : zoom in/out or scrolling */
+  
+  /* In order to make sure we can reuse the old drawing, the scale must
+   * be the same and the new time interval being partly located in the
+   * currently shown time interval. (reuse is only for scrolling)
+   */
+
+  g_info("Old time window HOOK : %u, %u to %u, %u",
+      old_time_window->start_time.tv_sec,
+      old_time_window->start_time.tv_nsec,
+      old_time_window->time_width.tv_sec,
+      old_time_window->time_width.tv_nsec);
+
+  g_info("New time window HOOK : %u, %u to %u, %u",
+      new_time_window->start_time.tv_sec,
+      new_time_window->start_time.tv_nsec,
+      new_time_window->time_width.tv_sec,
+      new_time_window->time_width.tv_nsec);
+
+  if( new_time_window->time_width.tv_sec == old_time_window->time_width.tv_sec
+  && new_time_window->time_width.tv_nsec == old_time_window->time_width.tv_nsec)
+  {
+    /* Same scale (scrolling) */
+    g_info("scrolling");
+    LttTime *ns = &new_time_window->start_time;
+    LttTime *os = &old_time_window->start_time;
+    LttTime old_end = ltt_time_add(old_time_window->start_time,
+                                    old_time_window->time_width);
+    LttTime new_end = ltt_time_add(new_time_window->start_time,
+                                    new_time_window->time_width);
+    //if(ns<os+w<ns+w)
+    //if(ns<os+w && os+w<ns+w)
+    //if(ns<old_end && os<ns)
+    if(ltt_time_compare(*ns, old_end) == -1
+        && ltt_time_compare(*os, *ns) == -1)
+    {
+      g_info("scrolling near right");
+      /* Scroll right, keep right part of the screen */
+      guint x = 0;
+      guint width = control_flow_data->drawing->width;
+      convert_time_to_pixels(
+          *os,
+          old_end,
+          *ns,
+          width,
+          &x);
+
+      /* Copy old data to new location */
+      gdk_draw_drawable (control_flow_data->drawing->pixmap,
+          control_flow_data->drawing->drawing_area->style->black_gc,
+          control_flow_data->drawing->pixmap,
+          x, 0,
+          0, 0,
+         control_flow_data->drawing->width-x+SAFETY, -1);
+      if(drawing->damage_begin == drawing->damage_end)
+        drawing->damage_begin = control_flow_data->drawing->width-x;
+      else
+        drawing->damage_begin = 0;
+
+      drawing->damage_end = control_flow_data->drawing->width;
+
+      /* Clear the data request background, but not SAFETY */
+      gdk_draw_rectangle (control_flow_data->drawing->pixmap,
+          //control_flow_data->drawing->drawing_area->style->black_gc,
+          control_flow_data->drawing->drawing_area->style->black_gc,
+          TRUE,
+          drawing->damage_begin+SAFETY, 0,
+          drawing->damage_end - drawing->damage_begin,  // do not overlap
+          control_flow_data->drawing->height);
+
+      gtk_widget_queue_draw_area (drawing->drawing_area,
+                                0,0,
+                                control_flow_data->drawing->width,
+                                control_flow_data->drawing->height);
+
+      /* Get new data for the rest. */
+      drawing_data_request(control_flow_data->drawing,
+          &control_flow_data->drawing->pixmap,
+          drawing->damage_begin, 0,
+          drawing->damage_end - drawing->damage_begin,
+          control_flow_data->drawing->height);
+    } else { 
+      //if(ns<os<ns+w)
+      //if(ns<os && os<ns+w)
+      //if(ns<os && os<new_end)
+      if(ltt_time_compare(*ns,*os) == -1
+          && ltt_time_compare(*os,new_end) == -1)
+      {
+        g_info("scrolling near left");
+        /* Scroll left, keep left part of the screen */
+        guint x = 0;
+        guint width = control_flow_data->drawing->width;
+        convert_time_to_pixels(
+            *ns,
+            new_end,
+            *os,
+            width,
+            &x);
         
+
+        /* Copy old data to new location */
+        gdk_draw_drawable (control_flow_data->drawing->pixmap,
+            control_flow_data->drawing->drawing_area->style->black_gc,
+            control_flow_data->drawing->pixmap,
+            0, 0,
+            x, 0,
+            -1, -1);
+  
+        if(drawing->damage_begin == drawing->damage_end)
+          drawing->damage_end = x;
+        else
+          drawing->damage_end = 
+            control_flow_data->drawing->width;
+
+        drawing->damage_begin = 0;
         
         gdk_draw_rectangle (control_flow_data->drawing->pixmap,
           control_flow_data->drawing->drawing_area->style->black_gc,
           TRUE,
-          0, 0,
-          control_flow_data->drawing->width+SAFETY, // do not overlap
-          control_flow_data->drawing->height+SAFETY);
+          drawing->damage_begin, 0,
+          drawing->damage_end - drawing->damage_begin,  // do not overlap
+          control_flow_data->drawing->height);
+
+        gtk_widget_queue_draw_area (drawing->drawing_area,
+                                0,0,
+                                control_flow_data->drawing->width,
+                                control_flow_data->drawing->height);
 
+
+        /* Get new data for the rest. */
         drawing_data_request(control_flow_data->drawing,
             &control_flow_data->drawing->pixmap,
-            0, 0,
-            control_flow_data->drawing->width,
+            drawing->damage_begin, 0,
+            drawing->damage_end - drawing->damage_begin,
             control_flow_data->drawing->height);
     
-        drawing_refresh(control_flow_data->drawing,
+      } else {
+        if(ltt_time_compare(*ns,*os) == 0)
+        {
+          g_info("not scrolling");
+        } else {
+          g_info("scrolling far");
+          /* Cannot reuse any part of the screen : far jump */
+          
+          
+          gdk_draw_rectangle (control_flow_data->drawing->pixmap,
+            control_flow_data->drawing->drawing_area->style->black_gc,
+            TRUE,
             0, 0,
-            control_flow_data->drawing->width,
+            control_flow_data->drawing->width+SAFETY, // do not overlap
             control_flow_data->drawing->height);
+
+          gtk_widget_queue_draw_area (drawing->drawing_area,
+                                0,0,
+                                control_flow_data->drawing->width,
+                                control_flow_data->drawing->height);
+
+          drawing->damage_begin = 0;
+          drawing->damage_end = control_flow_data->drawing->width;
+
+          drawing_data_request(control_flow_data->drawing,
+              &control_flow_data->drawing->pixmap,
+              0, 0,
+              control_flow_data->drawing->width,
+              control_flow_data->drawing->height);
+      
+        }
       }
     }
   } else {
     /* Different scale (zoom) */
     g_info("zoom");
 
-    *old_time_window = *new_time_window;
-  
     gdk_draw_rectangle (control_flow_data->drawing->pixmap,
           control_flow_data->drawing->drawing_area->style->black_gc,
           TRUE,
           0, 0,
           control_flow_data->drawing->width+SAFETY, // do not overlap
-          control_flow_data->drawing->height+SAFETY);
+          control_flow_data->drawing->height);
 
+    gtk_widget_queue_draw_area (drawing->drawing_area,
+                                0,0,
+                                control_flow_data->drawing->width,
+                                control_flow_data->drawing->height);
   
+    drawing->damage_begin = 0;
+    drawing->damage_end = control_flow_data->drawing->width;
+
     drawing_data_request(control_flow_data->drawing,
         &control_flow_data->drawing->pixmap,
         0, 0,
         control_flow_data->drawing->width,
         control_flow_data->drawing->height);
-  
-    drawing_refresh(control_flow_data->drawing,
-        0, 0,
-        control_flow_data->drawing->width,
-        control_flow_data->drawing->height);
   }
 
 
@@ -1211,29 +2749,131 @@ gint update_time_window_hook(void *hook_data, void *call_data)
   return 0;
 }
 
+gint traceset_notify(void *hook_data, void *call_data)
+{
+  ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
+  Drawing_t *drawing = control_flow_data->drawing;
+  GtkWidget *widget = drawing->drawing_area;
+
+
+  drawing_clear(control_flow_data->drawing);
+  processlist_clear(control_flow_data->process_list);
+  redraw_notify(control_flow_data, NULL);
+
+  request_background_data(control_flow_data);
+#if 0
+  drawing->damage_begin = 0;
+  drawing->damage_end = drawing->width;
+  if(drawing->damage_begin < drawing->damage_end)
+  {
+    drawing_data_request(drawing,
+                         &drawing->pixmap,
+                         drawing->damage_begin,
+                         0,
+                         drawing->damage_end-drawing->damage_begin,
+                         drawing->height);
+  }
+
+  gtk_widget_queue_draw_area(drawing->drawing_area,
+                             0,0,
+                             drawing->width,
+                             drawing->height);
+#endif //0
+  return FALSE;
+}
+
+gint redraw_notify(void *hook_data, void *call_data)
+{
+  ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
+  Drawing_t *drawing = control_flow_data->drawing;
+  GtkWidget *widget = drawing->drawing_area;
+
+  drawing->damage_begin = 0;
+  drawing->damage_end = drawing->width;
+
+  /* fun feature, to be separated someday... */
+  drawing_clear(control_flow_data->drawing);
+  processlist_clear(control_flow_data->process_list);
+
+  // Clear the image
+  gdk_draw_rectangle (drawing->pixmap,
+        widget->style->black_gc,
+        TRUE,
+        0, 0,
+        drawing->width+SAFETY,
+        drawing->height);
+
+
+  if(drawing->damage_begin < drawing->damage_end)
+  {
+    drawing_data_request(drawing,
+                         &drawing->pixmap,
+                         drawing->damage_begin,
+                         0,
+                         drawing->damage_end-drawing->damage_begin,
+                         drawing->height);
+  }
+
+  gtk_widget_queue_draw_area(drawing->drawing_area,
+                             0,0,
+                             drawing->width,
+                             drawing->height);
+  return FALSE;
+
+}
+
+
+gint continue_notify(void *hook_data, void *call_data)
+{
+  ControlFlowData *control_flow_data = (ControlFlowData*) hook_data;
+  Drawing_t *drawing = control_flow_data->drawing;
+  GtkWidget *widget = drawing->drawing_area;
+
+  //g_assert(widget->allocation.width == drawing->damage_end);
+
+  if(drawing->damage_begin < drawing->damage_end)
+  {
+    drawing_data_request(drawing,
+                         &drawing->pixmap,
+                         drawing->damage_begin,
+                         0,
+                         drawing->damage_end-drawing->damage_begin,
+                         drawing->height);
+  }
+
+  return FALSE;
+}
+
+
 gint update_current_time_hook(void *hook_data, void *call_data)
 {
   ControlFlowData *control_flow_data = (ControlFlowData*)hook_data;
+  Drawing_t *drawing = control_flow_data->drawing;
 
-  LttTime* current_time = 
-    guicontrolflow_get_current_time(control_flow_data);
-  *current_time = *((LttTime*)call_data);
+  LttTime current_time = *((LttTime*)call_data);
   
-  TimeWindow time_window;
+  TimeWindow time_window =
+            lttvwindow_get_time_window(control_flow_data->tab);
   
-  LttTime time_begin = control_flow_data->time_window.start_time;
-  LttTime width = control_flow_data->time_window.time_width;
-  LttTime half_width = ltt_time_div(width,2.0);
+  LttTime time_begin = time_window.start_time;
+  LttTime width = time_window.time_width;
+  LttTime half_width;
+  {
+    guint64 time_ll = ltt_time_to_uint64(width);
+    time_ll = time_ll >> 1; /* divide by two */
+    half_width = ltt_time_from_uint64(time_ll);
+  }
   LttTime time_end = ltt_time_add(time_begin, width);
 
   LttvTracesetContext * tsc =
-        get_traceset_context(control_flow_data->mw);
+        lttvwindow_get_traceset_context(control_flow_data->tab);
   
-  LttTime trace_start = tsc->Time_Span->startTime;
-  LttTime trace_end = tsc->Time_Span->endTime;
+  LttTime trace_start = tsc->time_span.start_time;
+  LttTime trace_end = tsc->time_span.end_time;
   
-  g_info("New current time HOOK : %u, %u", current_time->tv_sec,
-              current_time->tv_nsec);
+  g_info("New current time HOOK : %u, %u", current_time.tv_sec,
+              current_time.tv_nsec);
 
 
   
@@ -1247,40 +2887,49 @@ gint update_current_time_hook(void *hook_data, void *call_data)
    * at one end of the trace. */
   
   
-  if(ltt_time_compare(*current_time, time_begin) == -1)
+  if(ltt_time_compare(current_time, time_begin) == -1)
   {
-    if(ltt_time_compare(*current_time,
+    TimeWindow new_time_window;
+
+    if(ltt_time_compare(current_time,
           ltt_time_add(trace_start,half_width)) == -1)
       time_begin = trace_start;
     else
-      time_begin = ltt_time_sub(*current_time,half_width);
+      time_begin = ltt_time_sub(current_time,half_width);
   
-    time_window.start_time = time_begin;
-    time_window.time_width = width;
+    new_time_window.start_time = time_begin;
+    new_time_window.time_width = width;
 
-    set_time_window(control_flow_data->mw, &time_window);
+    lttvwindow_report_time_window(control_flow_data->tab, new_time_window);
   }
-  else if(ltt_time_compare(*current_time, time_end) == 1)
+  else if(ltt_time_compare(current_time, time_end) == 1)
   {
-    if(ltt_time_compare(*current_time, ltt_time_sub(trace_end, half_width)) == 1)
+    TimeWindow new_time_window;
+
+    if(ltt_time_compare(current_time, ltt_time_sub(trace_end, half_width)) == 1)
       time_begin = ltt_time_sub(trace_end,width);
     else
-      time_begin = ltt_time_sub(*current_time,half_width);
+      time_begin = ltt_time_sub(current_time,half_width);
   
-    time_window.start_time = time_begin;
-    time_window.time_width = width;
+    new_time_window.start_time = time_begin;
+    new_time_window.time_width = width;
 
-    set_time_window(control_flow_data->mw, &time_window);
+    lttvwindow_report_time_window(control_flow_data->tab, new_time_window);
     
   }
-  gtk_widget_queue_draw(control_flow_data->drawing->drawing_area);
+  //gtk_widget_queue_draw(control_flow_data->drawing->drawing_area);
+  gtk_widget_queue_draw_area(drawing->drawing_area,
+                             0,0,
+                             drawing->width,
+                             drawing->height);
   
   return 0;
 }
 
 typedef struct _ClosureData {
-  EventRequest *event_request;
-  LttvTraceState *ts;
+  EventsRequest *events_request;
+  LttvTracesetState *tss;
+  LttTime end_time;
 } ClosureData;
   
 
@@ -1290,153 +2939,242 @@ void draw_closure(gpointer key, gpointer value, gpointer user_data)
   HashedProcessData *hashed_process_data = (HashedProcessData*)value;
   ClosureData *closure_data = (ClosureData*)user_data;
     
-  ControlFlowData *control_flow_data =
-    closure_data->event_request->control_flow_data;
-  
-  GtkWidget *widget = control_flow_data->drawing->drawing_area;
+  EventsRequest *events_request = closure_data->events_request;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  Drawing_t *drawing = control_flow_data->drawing;
 
-  /* Get y position of process */
-  gint y=0, height=0;
-  
-  processlist_get_pixels_from_data( control_flow_data->process_list,
-          process_info,
-          hashed_process_data,
-          &y,
-          &height);
-  /* Get last state of process */
-  LttvTraceContext *tc =
-    (LttvTraceContext *)closure_data->ts;
+  LttvTracesetState *tss = closure_data->tss;
+  LttvTracesetContext *tsc = (LttvTracesetContext*)closure_data->tss;
 
-  LttvTraceState *ts = closure_data->ts;
-  LttvProcessState *process;
+  LttTime evtime = closure_data->end_time;
+  TimeWindow time_window = 
+    lttvwindow_get_time_window(control_flow_data->tab);
 
-  process = lttv_state_find_process((LttvTracefileState*)ts, process_info->pid);
-  
-  /* Draw the closing line */
-  DrawContext *draw_context = hashed_process_data->draw_context;
-  if(draw_context->previous->middle->x == -1)
-  {
-    draw_context->previous->middle->x = closure_data->event_request->x_begin;
-    g_critical("out middle x_beg : %u",closure_data->event_request->x_begin);
-  }
+  LttTime end_time = ltt_time_add(time_window.start_time,
+                                    time_window.time_width);
 
-  draw_context->current->middle->x = closure_data->event_request->x_end;
-  draw_context->current->middle->y = y + height/2;
-  draw_context->previous->middle->y = y + height/2;
-  draw_context->drawable = control_flow_data->drawing->pixmap;
-  draw_context->pango_layout = control_flow_data->drawing->pango_layout;
-  //draw_context->gc = widget->style->black_gc;
-  draw_context->gc = gdk_gc_new(control_flow_data->drawing->pixmap);
-  gdk_gc_copy(draw_context->gc, widget->style->black_gc);
+  if(ltt_time_compare(evtime, time_window.start_time) == -1
+        || ltt_time_compare(evtime, end_time) == 1)
+            return;
 
-  PropertiesLine prop_line;
-  prop_line.color = g_new(GdkColor,1);
-  prop_line.line_width = 2;
-  prop_line.style = GDK_LINE_SOLID;
-  prop_line.position = MIDDLE;
+  guint width = drawing->width;
 
-  /* color of line : status of the process */
-  if(process->state->s == LTTV_STATE_UNNAMED)
-  {
-    prop_line.color->red = 0xffff;
-    prop_line.color->green = 0xffff;
-    prop_line.color->blue = 0xffff;
-  }
-  else if(process->state->s == LTTV_STATE_WAIT_FORK)
-  {
-    prop_line.color->red = 0x0fff;
-    prop_line.color->green = 0xffff;
-    prop_line.color->blue = 0xfff0;
-  }
-  else if(process->state->s == LTTV_STATE_WAIT_CPU)
-  {
-    prop_line.color->red = 0xffff;
-    prop_line.color->green = 0xffff;
-    prop_line.color->blue = 0x0000;
-  }
-  else if(process->state->s == LTTV_STATE_EXIT)
-  {
-    prop_line.color->red = 0xffff;
-    prop_line.color->green = 0x0000;
-    prop_line.color->blue = 0xffff;
-  }
-  else if(process->state->s == LTTV_STATE_WAIT)
-  {
-    prop_line.color->red = 0xffff;
-    prop_line.color->green = 0x0000;
-    prop_line.color->blue = 0x0000;
-  }
-  else if(process->state->s == LTTV_STATE_RUN)
-  {
-    prop_line.color->red = 0x0000;
-    prop_line.color->green = 0xffff;
-    prop_line.color->blue = 0x0000;
-  }
-  else
-  {
-    prop_line.color->red = 0xffff;
-    prop_line.color->green = 0xffff;
-    prop_line.color->blue = 0xffff;
+  { 
+    /* For the process */
+    /* First, check if the current process is in the state computation
+     * process list. If it is there, that means we must add it right now and
+     * draw items from the beginning of the read for it. If it is not
+     * present, it's a new process and it was not present : it will
+     * be added after the state update.  */
+    g_assert(lttv_traceset_number(tsc->ts) > 0);
+
+    /* tracefiles[0] is ok here, because we draw for every PID, and
+     * assume CPU 0 for PID 0 //FIXME */
+    LttvTracefileState *tfs =
+      (LttvTracefileState*)tsc->traces[process_info->trace_num]->tracefiles[0];
+
+    LttvProcessState *process;
+    process = lttv_state_find_process(tfs,
+                                      process_info->pid);
+
+    if(process != NULL) {
+      
+      /* Only draw for processes that are currently in the trace states */
+
+      guint y = 0, height = 0, pl_height = 0;
+      ProcessList *process_list = 
+                      guicontrolflow_get_process_list(control_flow_data);
+      LttTime birth = process_info->birth;
+      
+      /* Should be alike when background info is ready */
+      if(control_flow_data->background_info_waiting==0)
+        g_assert(ltt_time_compare(process->creation_time,
+                                  process_info->birth) == 0);
+      const gchar *name = g_quark_to_string(process->name);
+      
+      /* process HAS to be present */
+      g_assert(processlist_get_process_pixels(process_list,
+              process_info->pid,
+              process_info->cpu,
+              &birth,
+              process_info->trace_num,
+              &y,
+              &height,
+              &hashed_process_data) != 1);
+    
+      /* Now, the process is in the state hash and our own process hash.
+       * We definitely can draw the items related to the ending state.
+       */
+      
+      /* Check if the x position is unset. In can have been left unset by
+       * a draw closure from a after chunk hook. This should never happen,
+       * because it must be set by before chunk hook to the damage_begin
+       * value.
+       */
+      g_assert(hashed_process_data->x.over != -1);
+      {
+        guint x;
+
+        convert_time_to_pixels(
+            time_window.start_time,
+            end_time,
+            evtime,
+            width,
+            &x);
+
+        DrawContext draw_context;
+
+        /* Now create the drawing context that will be used to draw
+         * items related to the last state. */
+        draw_context.drawable = drawing->pixmap;
+        draw_context.gc = drawing->gc;
+        draw_context.pango_layout = drawing->pango_layout;
+        draw_context.drawinfo.end.x = x;
+
+        draw_context.drawinfo.y.over = y+1;
+        draw_context.drawinfo.y.middle = y+(height/2);
+        draw_context.drawinfo.y.under = y+height;
+
+        draw_context.drawinfo.start.offset.over = 0;
+        draw_context.drawinfo.start.offset.middle = 0;
+        draw_context.drawinfo.start.offset.under = 0;
+        draw_context.drawinfo.end.offset.over = 0;
+        draw_context.drawinfo.end.offset.middle = 0;
+        draw_context.drawinfo.end.offset.under = 0;
+#if 0
+        /* Jump over draw if we are at the same x position */
+        if(x == hashed_process_data->x.over)
+        {
+          /* jump */
+        } else {
+          draw_context.drawinfo.start.x = hashed_process_data->x.over;
+          /* Draw the line */
+          PropertiesLine prop_line = prepare_execmode_line(process);
+          draw_line((void*)&prop_line, (void*)&draw_context);
+
+          hashed_process_data->x.over = x;
+        }
+#endif //0
+
+        if(x == hashed_process_data->x.middle &&
+            hashed_process_data->x.middle_used) {
+          if(hashed_process_data->x.middle_marked == FALSE) {
+            /* Draw collision indicator */
+            gdk_gc_set_foreground(drawing->gc, &drawing_colors[COL_WHITE]);
+            gdk_draw_point(drawing->pixmap,
+                           drawing->gc,
+                           x,
+                           draw_context.drawinfo.y.over);
+          }
+          /* Jump */
+        } else {
+          draw_context.drawinfo.start.x = hashed_process_data->x.middle;
+          /* Draw the line */
+          PropertiesLine prop_line = prepare_s_e_line(process);
+          draw_line((void*)&prop_line, (void*)&draw_context);
+
+           /* become the last x position */
+          if(x != hashed_process_data->x.middle) {
+            hashed_process_data->x.middle = x;
+            /* but don't use the pixel */
+            hashed_process_data->x.middle_used = FALSE;
+          }
+        }
+      }
+    }
   }
+  return;
+}
 
-  draw_line((void*)&prop_line, (void*)draw_context);
-  g_free(prop_line.color);
-  gdk_gc_unref(draw_context->gc);
-
-  /* Reset draw_context of the process for next request */
-
-  hashed_process_data->draw_context->drawable = NULL;
-  hashed_process_data->draw_context->gc = NULL;
-  hashed_process_data->draw_context->pango_layout = NULL;
-  hashed_process_data->draw_context->current->over->x = -1;
-  hashed_process_data->draw_context->current->over->y = -1;
-  hashed_process_data->draw_context->current->middle->x = -1;
-  hashed_process_data->draw_context->current->middle->y = -1;
-  hashed_process_data->draw_context->current->under->x = -1;
-  hashed_process_data->draw_context->current->under->y = -1;
-  hashed_process_data->draw_context->current->modify_over->x = -1;
-  hashed_process_data->draw_context->current->modify_over->y = -1;
-  hashed_process_data->draw_context->current->modify_middle->x = -1;
-  hashed_process_data->draw_context->current->modify_middle->y = -1;
-  hashed_process_data->draw_context->current->modify_under->x = -1;
-  hashed_process_data->draw_context->current->modify_under->y = -1;
-  hashed_process_data->draw_context->current->status = LTTV_STATE_UNNAMED;
-  hashed_process_data->draw_context->previous->over->x = -1;
-  hashed_process_data->draw_context->previous->over->y = -1;
-  hashed_process_data->draw_context->previous->middle->x = -1;
-  hashed_process_data->draw_context->previous->middle->y = -1;
-  hashed_process_data->draw_context->previous->under->x = -1;
-  hashed_process_data->draw_context->previous->under->y = -1;
-  hashed_process_data->draw_context->previous->modify_over->x = -1;
-  hashed_process_data->draw_context->previous->modify_over->y = -1;
-  hashed_process_data->draw_context->previous->modify_middle->x = -1;
-  hashed_process_data->draw_context->previous->modify_middle->y = -1;
-  hashed_process_data->draw_context->previous->modify_under->x = -1;
-  hashed_process_data->draw_context->previous->modify_under->y = -1;
-  hashed_process_data->draw_context->previous->status = LTTV_STATE_UNNAMED;
-  
+int before_chunk(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  LttvTracesetState *tss = LTTV_TRACESET_STATE(call_data);
+
+  drawing_chunk_begin(events_request, tss);
 
+  return 0;
+}
+
+int before_request(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  LttvTracesetState *tss = LTTV_TRACESET_STATE(call_data);
+
+  drawing_data_request_begin(events_request, tss);
+
+  return 0;
 }
 
+
 /*
+ * after request is necessary in addition of after chunk in order to draw 
+ * lines until the end of the screen. after chunk just draws lines until
+ * the last event.
+ * 
  * for each process
  *    draw closing line
- *    new default prev and current
+ *    expose
  */
-int  after_data_request(void *hook_data, void *call_data)
+int after_request(void *hook_data, void *call_data)
 {
-  EventRequest *event_request = (EventRequest*)hook_data;
-  ControlFlowData *control_flow_data = event_request->control_flow_data;
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  LttvTracesetState *tss = LTTV_TRACESET_STATE(call_data);
+  LttvTracesetContext *tsc = LTTV_TRACESET_CONTEXT(call_data);
   
   ProcessList *process_list =
-    guicontrolflow_get_process_list(event_request->control_flow_data);
+    guicontrolflow_get_process_list(control_flow_data);
+  LttTime end_time = events_request->end_time;
 
   ClosureData closure_data;
-  closure_data.event_request = (EventRequest*)hook_data;
-  closure_data.ts = (LttvTraceState*)call_data;
+  closure_data.events_request = (EventsRequest*)hook_data;
+  closure_data.tss = tss;
+  closure_data.end_time = end_time;
 
+  /* Draw last items */
   g_hash_table_foreach(process_list->process_hash, draw_closure,
                         (void*)&closure_data);
+
+  /* Request expose */
+  drawing_request_expose(events_request, tss, end_time);
+  return 0;
+}
+
+/*
+ * for each process
+ *    draw closing line
+ * expose
+ */
+int after_chunk(void *hook_data, void *call_data)
+{
+  EventsRequest *events_request = (EventsRequest*)hook_data;
+  ControlFlowData *control_flow_data = events_request->viewer_data;
+  LttvTracesetState *tss = LTTV_TRACESET_STATE(call_data);
+  LttvTracesetContext *tsc = LTTV_TRACESET_CONTEXT(call_data);
+  LttvTracefileContext *tfc = lttv_traceset_context_get_current_tfc(tsc);
+  LttTime end_time;
   
+  ProcessList *process_list =
+    guicontrolflow_get_process_list(control_flow_data);
+
+  if(tfc != NULL)
+    end_time = LTT_TIME_MIN(tfc->timestamp, events_request->end_time);
+  else /* end of traceset, or position now out of request : end */
+    end_time = events_request->end_time;
+  
+  ClosureData closure_data;
+  closure_data.events_request = (EventsRequest*)hook_data;
+  closure_data.tss = tss;
+  closure_data.end_time = end_time;
+
+  /* Draw last items */
+  g_hash_table_foreach(process_list->process_hash, draw_closure,
+                        (void*)&closure_data);
+
+  /* Request expose */
+  drawing_request_expose(events_request, tss, end_time);
+
+  return 0;
 }
 
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