GP Interpolate Sequence: Tool settings for controlling the shape of interpolation

This commit introduces the ability to use the Robert Penner easing equations
or a Custom Curve to control the way that the "Interpolate Sequence" operator
interpolates between keyframes. Previously, it was only possible to get linear
interpolation between the gp frames.

Workflow:
1) Place current frame between a pair of GP keyframes
2) Open the "Interpolate" panel in the Toolshelf
3) Choose the interpolation type (under "Sequence Options")
4) Adjust settings (e.g. if you're using "Custom Curve", use the curvemap widget
   to define the way that the interpolation proceeds)
5) Click "Sequence" to interpolate
6) Play back/scrub the animation to see if you've got the result you want
7) If you need to make some tweaks, undo, or delete the generated keyframes,
   then repeat the process again from step 4 until you've got the desired result.

1 files changed, 12 insertions, 4 deletions

diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 39a97b08df1..69d3b4db54c 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -287,13 +287,16 @@ Scene *BKE_scene_copy(Main *bmain, Scene *sce, int type)
 		ts->imapaint.paintcursor = NULL;
 		id_us_plus((ID *)ts->imapaint.stencil);
 		ts->particle.paintcursor = NULL;
+		
 		/* duplicate Grease Pencil Drawing Brushes */
 		BLI_listbase_clear(&ts->gp_brushes);
 		for (bGPDbrush *brush = sce->toolsettings->gp_brushes.first; brush; brush = brush->next) {
 			bGPDbrush *newbrush = BKE_gpencil_brush_duplicate(brush);
 			BLI_addtail(&ts->gp_brushes, newbrush);
 		}
-
+		
+		/* duplicate Grease Pencil interpolation curve */
+		ts->gp_interpolate.custom_ipo = curvemapping_copy(ts->gp_interpolate.custom_ipo);
 	}
 	
 	/* make a private copy of the avicodecdata */
@@ -440,12 +443,17 @@ void BKE_scene_free(Scene *sce)
 			BKE_paint_free(&sce->toolsettings->uvsculpt->paint);
 			MEM_freeN(sce->toolsettings->uvsculpt);
 		}
+		BKE_paint_free(&sce->toolsettings->imapaint.paint);
+		
 		/* free Grease Pencil Drawing Brushes */
 		BKE_gpencil_free_brushes(&sce->toolsettings->gp_brushes);
 		BLI_freelistN(&sce->toolsettings->gp_brushes);
-
-		BKE_paint_free(&sce->toolsettings->imapaint.paint);
-
+		
+		/* free Grease Pencil interpolation curve */
+		if (sce->toolsettings->gp_interpolate.custom_ipo) {
+			curvemapping_free(sce->toolsettings->gp_interpolate.custom_ipo);
+		}
+		
 		MEM_freeN(sce->toolsettings);
 		sce->toolsettings = NULL;
 	}