"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, 40 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/fcurve.c b/source/blender/blenkernel/intern/fcurve.c
index d4fa9de1043..281b4f589e1 100644
--- a/source/blender/blenkernel/intern/fcurve.c
+++ b/source/blender/blenkernel/intern/fcurve.c
@@ -2139,6 +2139,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_back_ease_in_out(time, begin, change, duration, prevbezt->back);
 								break;
+								
+							default: /* default/auto: same as ease out */
+								cvalue = BLI_easing_back_ease_out(time, begin, change, duration, prevbezt->back);
+								break;
 						}
 						break;
 					
@@ -2153,6 +2157,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_bounce_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease out */
+								cvalue = BLI_easing_bounce_ease_out(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2167,6 +2175,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_circ_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_circ_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 
@@ -2181,6 +2193,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_cubic_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_cubic_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2195,6 +2211,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_elastic_ease_in_out(time, begin, change, duration, amplitude, period);
 								break;
+								
+							default: /* default/auto: same as ease out */
+								cvalue = BLI_easing_elastic_ease_out(time, begin, change, duration, amplitude, period);
+								break;
 						}
 						break;
 					
@@ -2209,6 +2229,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_expo_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_expo_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2223,6 +2247,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_quad_ease_in_out(time, begin, change, duration);
 								break;
+							
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_quad_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2237,6 +2265,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_quart_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_quart_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2251,6 +2283,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_quint_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_quint_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;
 					
@@ -2265,6 +2301,10 @@ static float fcurve_eval_keyframes(FCurve *fcu, BezTriple *bezts, float evaltime
 							case BEZT_IPO_EASE_IN_OUT:
 								cvalue = BLI_easing_sine_ease_in_out(time, begin, change, duration);
 								break;
+								
+							default: /* default/auto: same as ease in */
+								cvalue = BLI_easing_sine_ease_in(time, begin, change, duration);
+								break;
 						}
 						break;