[gimp/wip/animation: 225/373] plug-ins: warn of low framerate…

[Jehan Pagès <jehanp src gnome org>]

commit 2bdfe4d7725c7ea5cf4c019a5484af2d45bda67c
Author: Jehan <jehan girinstud io>
Date:   Wed Aug 19 16:11:38 2015 +0200

    plug-ins: warn of low framerate…
    
    useful when playing big HD animations.

 plug-ins/animation-play/animation-dialog.c |   44 ++++++++++++++++++++++++++++
 plug-ins/animation-play/animation.c        |   14 +++++++++
 2 files changed, 58 insertions(+), 0 deletions(-)
---
diff --git a/plug-ins/animation-play/animation-dialog.c b/plug-ins/animation-play/animation-dialog.c
index 5447c6e..4809576 100755
--- a/plug-ins/animation-play/animation-dialog.c
+++ b/plug-ins/animation-play/animation-dialog.c
@@ -202,6 +202,9 @@ static void        framerate_changed         (Animation        *animation,
 static void        disposal_changed          (Animation        *animation,
                                               gint              disposal,
                                               AnimationDialog  *dialog);
+static void        low_framerate_cb          (Animation        *animation,
+                                              gdouble           real_framerate,
+                                              AnimationDialog  *dialog);
 
 /* Rendering/Playing Functions */
 static gboolean    repaint_da                (GtkWidget        *darea,
@@ -772,6 +775,9 @@ animation_dialog_constructed (GObject *object)
   g_signal_connect (priv->animation, "render",
                     G_CALLBACK (render_callback),
                     dialog);
+  g_signal_connect (priv->animation, "low-framerate-playback",
+                    G_CALLBACK (low_framerate_cb),
+                    dialog);
 }
 
 static void
@@ -1504,6 +1510,12 @@ play_callback (GtkToggleAction *action,
     {
       gtk_action_set_icon_name (GTK_ACTION (action), "media-playback-start");
       animation_stop (priv->animation);
+
+      /* The framerate combo might have been modified to display slowness
+       * warnings. */
+      gtk_widget_modify_text (gtk_bin_get_child (GTK_BIN (priv->fpscombo)), GTK_STATE_NORMAL, NULL);
+      gimp_help_set_help_data (priv->fpscombo, _("Frame Rate"), NULL);
+      framerate_changed (priv->animation, animation_get_framerate (priv->animation), dialog);
     }
 
   g_object_set (action,
@@ -1768,6 +1780,38 @@ disposal_changed (Animation        *animation,
                                      dialog);
 }
 
+static void
+low_framerate_cb (Animation       *animation,
+                  gdouble          real_framerate,
+                  AnimationDialog *dialog)
+{
+  AnimationDialogPrivate *priv = GET_PRIVATE (dialog);
+  GdkColor                gdk_red;
+  gchar                  *text;
+
+  gdk_red.red = 65535;
+  gdk_red.green = 0;
+  gdk_red.blue = 0;
+
+  g_signal_handlers_block_by_func (priv->fpscombo,
+                                   G_CALLBACK (fpscombo_changed),
+                                   dialog);
+  g_signal_handlers_block_by_func (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->fpscombo))),
+                                   G_CALLBACK (fpscombo_activated),
+                                   dialog);
+  gtk_widget_modify_text (gtk_bin_get_child (GTK_BIN (priv->fpscombo)), GTK_STATE_NORMAL, &gdk_red);
+  text = g_strdup_printf  (_("%g fps"), real_framerate);
+  gtk_entry_set_text (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->fpscombo))), text);
+  g_signal_handlers_unblock_by_func (priv->fpscombo,
+                                     G_CALLBACK (fpscombo_changed),
+                                     dialog);
+  g_signal_handlers_unblock_by_func (GTK_ENTRY (gtk_bin_get_child (GTK_BIN (priv->fpscombo))),
+                                     G_CALLBACK (fpscombo_activated),
+                                     dialog);
+  gtk_widget_set_tooltip_text (priv->fpscombo,
+                               _ ("Playback is too slow. We would drop a frame if frame dropping were 
implemented."));
+}
+
 /* Rendering Functions */
 
 static gboolean
diff --git a/plug-ins/animation-play/animation.c b/plug-ins/animation-play/animation.c
index 7034d5f..27052bb 100644
--- a/plug-ins/animation-play/animation.c
+++ b/plug-ins/animation-play/animation.c
@@ -1354,6 +1354,7 @@ animation_time_to_next (Animation *animation,
   AnimationPrivate *priv = ANIMATION_GET_PRIVATE (animation);
   static gint64     start_time = -1;
   static gint       frames = 0;
+  static gboolean   prev_low_framerate = FALSE;
   gdouble           expected_time_from_start = 0.0;
   gdouble           duration;
 
@@ -1381,8 +1382,21 @@ animation_time_to_next (Animation *animation,
 
       if (duration < 1.0)
         {
+          if (prev_low_framerate)
+            {
+              /* Let's only warn the user if several subsequent frames slow. */
+              gdouble real_framerate = (gdouble) frames * 1000000.0 / (g_get_monotonic_time () - start_time);
+              g_signal_emit (animation, animation_signals[LOW_FRAMERATE], 0,
+                             real_framerate);
+            }
           duration = 1.0;
+          prev_low_framerate = TRUE;
         }
+      else
+        {
+          prev_low_framerate = FALSE;
+        }
+
     }
 
   return duration;