From ae7904e7a87c0d5ef17b4bfeddbf3221d6a7325f Mon Sep 17 00:00:00 2001
From: Austin Blanton <imaus10@gmail.com>
Date: Thu, 28 Aug 2014 14:23:06 -0400
Subject: [PATCH] Add DiscardAlphaTransform to drop 4th channel if exists

---
 openbr/plugins/cvt.cpp | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+), 0 deletions(-)

diff --git a/openbr/plugins/cvt.cpp b/openbr/plugins/cvt.cpp
index fc8d9fb..2dedfcd 100644
--- a/openbr/plugins/cvt.cpp
+++ b/openbr/plugins/cvt.cpp
@@ -162,6 +162,34 @@ BR_REGISTER(Transform, EnsureChannelsTransform)
 
 /*!
  * \ingroup transforms
+ * \brief Drop the alpha channel (if exists).
+ * \author Austin Blanton \cite imaus10
+ */
+class DiscardAlphaTransform : public UntrainableTransform
+{
+    Q_OBJECT
+
+    void project(const Template &src, Template &dst) const
+    {
+        if (src.m().channels() > 4 || src.m().channels() == 2) {
+            dst.file.fte = true;
+            return;
+        }
+
+        dst = src;
+        if (src.m().channels() == 4) {
+            std::vector<Mat> mv;
+            split(src, mv);
+            mv.pop_back();
+            merge(mv, dst);
+        }
+    }
+};
+
+BR_REGISTER(Transform, DiscardAlphaTransform)
+
+/*!
+ * \ingroup transforms
  * \brief Normalized RG color space.
  * \author Josh Klontz \cite jklontz
  */
--
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