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[timeline] Limit timelines to 1000 frames per second
Since we are using milliseconds granularity to integrate timelines with the GLib main loop, we cannot allow values of the :fps property bigger than 1000. This means validating the fps value both in the GParamSpec and the clutter_timeline_set_speed() accessor function. This should also fix floating point exceptions when trying to perform "n_frames = milliseconds / (1000 / fps)". See bug 1354: http://bugzilla.openedhand.com/show_bug.cgi?id=1354
This commit is contained in:
Emmanuele Bassi
parent
81f642d4b7
commit
1e071ed859
@ -351,6 +351,7 @@ static void
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clutter_timeline_class_init (ClutterTimelineClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GParamSpec *pspec;
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timeline_pool_init ();
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@ -364,42 +365,45 @@ clutter_timeline_class_init (ClutterTimelineClass *klass)
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/**
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* ClutterTimeline:fps:
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*
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* Timeline frames per second. Because of the nature of the main
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* loop used by Clutter this is to be considered a best approximation.
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* Number of frames per second. Because of the nature of the main
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* loop used by Clutter, we can only accept a granularity of one
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* frame per millisecond.
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*
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* This value is to be considered a best approximation.
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*/
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g_object_class_install_property (object_class,
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PROP_FPS,
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g_param_spec_uint ("fps",
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"Frames Per Second",
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"Timeline frames per second",
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1, G_MAXUINT,
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60,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_uint ("fps",
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"Frames Per Second",
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"Frames per second",
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1, 1000,
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60,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_FPS, pspec);
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/**
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* ClutterTimeline:num-frames:
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*
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* Total number of frames for the timeline.
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*/
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g_object_class_install_property (object_class,
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PROP_NUM_FRAMES,
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g_param_spec_uint ("num-frames",
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"Total number of frames",
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"Timelines total number of frames",
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1, G_MAXUINT,
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1,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_uint ("num-frames",
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"Total number of frames",
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"Total number of frames",
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1, G_MAXUINT,
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1,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_NUM_FRAMES, pspec);
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/**
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* ClutterTimeline:loop:
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*
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* Whether the timeline should automatically rewind and restart.
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*/
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g_object_class_install_property (object_class,
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PROP_LOOP,
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g_param_spec_boolean ("loop",
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"Loop",
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"Should the timeline automatically restart",
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FALSE,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_boolean ("loop",
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"Loop",
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"Should the timeline automatically restart",
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FALSE,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_LOOP, pspec);
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/**
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* ClutterTimeline:delay:
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*
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@ -408,14 +412,14 @@ clutter_timeline_class_init (ClutterTimelineClass *klass)
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*
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* Since: 0.4
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*/
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g_object_class_install_property (object_class,
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PROP_DELAY,
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g_param_spec_uint ("delay",
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"Delay",
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"Delay before start",
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0, G_MAXUINT,
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0,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_uint ("delay",
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"Delay",
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"Delay before start",
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0, G_MAXUINT,
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0,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_DELAY, pspec);
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/**
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* ClutterTimeline:duration:
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*
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@ -424,14 +428,14 @@ clutter_timeline_class_init (ClutterTimelineClass *klass)
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*
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* Since: 0.6
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*/
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g_object_class_install_property (object_class,
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PROP_DURATION,
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g_param_spec_uint ("duration",
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"Duration",
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"Duration of the timeline in milliseconds",
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0, G_MAXUINT,
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1000,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_uint ("duration",
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"Duration",
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"Duration of the timeline in milliseconds",
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0, G_MAXUINT,
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1000,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_DURATION, pspec);
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/**
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* ClutterTimeline:direction:
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*
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@ -440,14 +444,13 @@ clutter_timeline_class_init (ClutterTimelineClass *klass)
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*
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* Since: 0.6
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*/
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g_object_class_install_property (object_class,
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PROP_DIRECTION,
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g_param_spec_enum ("direction",
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"Direction",
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"Direction of the timeline",
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CLUTTER_TYPE_TIMELINE_DIRECTION,
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CLUTTER_TIMELINE_FORWARD,
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CLUTTER_PARAM_READWRITE));
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pspec = g_param_spec_enum ("direction",
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"Direction",
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"Direction of the timeline",
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CLUTTER_TYPE_TIMELINE_DIRECTION,
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CLUTTER_TIMELINE_FORWARD,
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CLUTTER_PARAM_READWRITE);
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g_object_class_install_property (object_class, PROP_DIRECTION, pspec);
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/**
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* ClutterTimeline::new-frame:
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@ -547,7 +550,8 @@ clutter_timeline_class_init (ClutterTimelineClass *klass)
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timeline_signals[MARKER_REACHED] =
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g_signal_new ("marker-reached",
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G_TYPE_FROM_CLASS (object_class),
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G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE | G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
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G_SIGNAL_RUN_LAST | G_SIGNAL_NO_RECURSE |
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G_SIGNAL_DETAILED | G_SIGNAL_NO_HOOKS,
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G_STRUCT_OFFSET (ClutterTimelineClass, marker_reached),
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NULL, NULL,
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clutter_marshal_VOID__STRING_INT,
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@ -612,7 +616,7 @@ timeline_timeout_func (gpointer data)
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ClutterTimeline *timeline = data;
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ClutterTimelinePrivate *priv;
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GTimeVal timeval;
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guint n_frames;
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guint n_frames, speed;
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gulong msecs;
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priv = timeline->priv;
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@ -639,7 +643,11 @@ timeline_timeout_func (gpointer data)
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msecs = (timeval.tv_sec - priv->prev_frame_timeval.tv_sec) * 1000;
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msecs += (timeval.tv_usec - priv->prev_frame_timeval.tv_usec) / 1000;
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priv->msecs_delta = msecs;
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n_frames = msecs / (1000 / priv->fps);
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/* we need to avoid fps > 1000 */
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speed = MAX (1000 / priv->fps, 1);
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n_frames = msecs / speed;
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if (n_frames == 0)
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n_frames = 1;
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@ -1089,10 +1097,11 @@ clutter_timeline_set_n_frames (ClutterTimeline *timeline,
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/**
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* clutter_timeline_set_speed:
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* @timeline: A #ClutterTimeline
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* @fps: New speed of timeline as frames per second
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* @fps: New speed of timeline as frames per second,
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* between 1 and 1000
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*
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* Set the speed in frames per second of the timeline.
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**/
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*/
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void
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clutter_timeline_set_speed (ClutterTimeline *timeline,
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guint fps)
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@ -1100,7 +1109,7 @@ clutter_timeline_set_speed (ClutterTimeline *timeline,
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ClutterTimelinePrivate *priv;
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g_return_if_fail (CLUTTER_IS_TIMELINE (timeline));
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g_return_if_fail (fps > 0);
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g_return_if_fail (fps > 0 && fps <= 1000);
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priv = timeline->priv;
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