From c83d37ccc07c40813e44658857fc79886099b485 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Wed, 13 Jun 2012 08:35:50 +0000
Subject: [PATCH] mango request - highlight active mask layers. - remove
 keyframes when all layer data is removed.

---
 source/blender/blenkernel/BKE_mask.h    |  1 +
 source/blender/blenkernel/intern/mask.c | 29 ++++++++++++++++---------
 source/blender/editors/mask/mask_ops.c  |  6 +++++
 3 files changed, 26 insertions(+), 10 deletions(-)

diff --git a/source/blender/blenkernel/BKE_mask.h b/source/blender/blenkernel/BKE_mask.h
index 345a2190e89..dd2c7cb3a18 100644
--- a/source/blender/blenkernel/BKE_mask.h
+++ b/source/blender/blenkernel/BKE_mask.h
@@ -48,6 +48,7 @@ struct MaskLayer *BKE_mask_layer_active(struct Mask *mask);
 void BKE_mask_layer_active_set(struct Mask *mask, struct MaskLayer *masklay);
 void BKE_mask_layer_remove(struct Mask *mask, struct MaskLayer *masklay);
 
+void BKE_mask_layer_free_shapes(struct MaskLayer *masklay);
 void BKE_mask_layer_free(struct MaskLayer *masklay);
 void BKE_mask_spline_free(struct MaskSpline *spline);
 struct MaskSpline *BKE_mask_spline_copy(struct MaskSpline *spline);
diff --git a/source/blender/blenkernel/intern/mask.c b/source/blender/blenkernel/intern/mask.c
index a28ff3a175d..012ce97b4d7 100644
--- a/source/blender/blenkernel/intern/mask.c
+++ b/source/blender/blenkernel/intern/mask.c
@@ -1029,10 +1029,27 @@ void BKE_mask_layer_shape_free(MaskLayerShape *masklay_shape)
 	MEM_freeN(masklay_shape);
 }
 
+/** \brief Free all animation keys for a mask layer
+ */
+void BKE_mask_layer_free_shapes(MaskLayer *masklay)
+{
+	MaskLayerShape *masklay_shape;
+
+	/* free animation data */
+	masklay_shape = masklay->splines_shapes.first;
+	while (masklay_shape) {
+		MaskLayerShape *next_masklay_shape = masklay_shape->next;
+
+		BLI_remlink(&masklay->splines_shapes, masklay_shape);
+		BKE_mask_layer_shape_free(masklay_shape);
+
+		masklay_shape = next_masklay_shape;
+	}
+}
+
 void BKE_mask_layer_free(MaskLayer *masklay)
 {
 	MaskSpline *spline;
-	MaskLayerShape *masklay_shape;
 
 	/* free splines */
 	spline = masklay->splines.first;
@@ -1046,15 +1063,7 @@ void BKE_mask_layer_free(MaskLayer *masklay)
 	}
 
 	/* free animation data */
-	masklay_shape = masklay->splines_shapes.first;
-	while (masklay_shape) {
-		MaskLayerShape *next_masklay_shape = masklay_shape->next;
-
-		BLI_remlink(&masklay->splines_shapes, masklay_shape);
-		BKE_mask_layer_shape_free(masklay_shape);
-
-		masklay_shape = next_masklay_shape;
-	}
+	BKE_mask_layer_free_shapes(masklay);
 
 	MEM_freeN(masklay);
 }
diff --git a/source/blender/editors/mask/mask_ops.c b/source/blender/editors/mask/mask_ops.c
index 7c94b79010c..315e40380f9 100644
--- a/source/blender/editors/mask/mask_ops.c
+++ b/source/blender/editors/mask/mask_ops.c
@@ -957,6 +957,12 @@ static int delete_exec(bContext *C, wmOperator *UNUSED(op))
 
 			spline = next_spline;
 		}
+
+		/* not essential but confuses users when there are keys with no data!
+		 * assume if they delete all data from the layer they also dont care about keys */
+		if (masklay->splines.first == NULL) {
+			BKE_mask_layer_free_shapes(masklay);
+		}
 	}
 
 	/* TODO: only update edited splines */