"Auto" option for Keyframe.easing

This option (alongside the Ease In/Out/InOut options already available) aims to make it
easier to get an initial curve that looks closer to the one you were expecting, by
automatically picking whether Ease In or Ease Out should be used based on the type of
interpolation being used for the curve segment in question.

Notes:
* The types chosen may need some adjustments (e.g. using ease in-out instead of just ease in)
* This does break compatability with files saved in previous dev builds, but only
  if you were using Bounce/Elastic/Back with "Ease In"

1 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/editors/animation/keyframes_edit.c b/source/blender/editors/animation/keyframes_edit.c
index 808ed758659..320aa0a2885 100644
--- a/source/blender/editors/animation/keyframes_edit.c
+++ b/source/blender/editors/animation/keyframes_edit.c
@@ -1103,6 +1103,13 @@ static short set_easingtype_easeinout(KeyframeEditData *UNUSED(ked), BezTriple *
 	return 0;
 }
 
+static short set_easingtype_easeauto(KeyframeEditData *UNUSED(ked), BezTriple *bezt)
+{
+	if (bezt->f2 & SELECT)
+		bezt->easing = BEZT_IPO_EASE_AUTO;
+	return 0;
+}
+
 /* Set the easing type of the selected BezTriples in each F-Curve to the specified one */
 KeyframeEditFunc ANIM_editkeyframes_easing(short mode)
 {
@@ -1114,8 +1121,10 @@ KeyframeEditFunc ANIM_editkeyframes_easing(short mode)
 			return set_easingtype_easeout;
 		
 		case BEZT_IPO_EASE_IN_OUT: /* both */
-		default:
 			return set_easingtype_easeinout;
+			
+		default: /* auto */
+			return set_easingtype_easeauto;
 	}
 }