The Distance Node in 2.49/2.5/2.6 pre-tiles has a different calculation for RGB and YCC. While RGB

calculate the distance in 3d between R,G and B, the YCC only takes Cb and Cr
into consideration.

This commit makes COM_DistanceMatteOperation inheritable and expose the calculate distance function
to be re-implemented for the YCC node operation.

Thanks Troy Sobotka for the report over email.
Patch incorporates review suggestions by Jeroen Bakker.

1 files changed, 35 insertions, 0 deletions

diff --git a/source/blender/compositor/operations/COM_DistanceYCCMatteOperation.cpp b/source/blender/compositor/operations/COM_DistanceYCCMatteOperation.cpp
new file mode 100644
index 00000000000..32ed7486f5b
--- /dev/null
+++ b/source/blender/compositor/operations/COM_DistanceYCCMatteOperation.cpp
@@ -0,0 +1,35 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor:
+ *		Dalai Felinto
+ */
+
+#include "COM_DistanceYCCMatteOperation.h"
+#include "BLI_math.h"
+
+DistanceYCCMatteOperation::DistanceYCCMatteOperation() : DistanceRGBMatteOperation()
+{
+	/* pass */
+}
+
+float DistanceYCCMatteOperation::calculateDistance(float key[4], float image[4])
+{
+	return sqrt(pow((key[1] - image[1]), 2) +
+	            pow((key[2] - image[2]), 2));
+}
+