1 files changed, 60 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ConvertPremulToStraightOperation.cpp b/source/blender/compositor/operations/COM_ConvertPremulToStraightOperation.cpp
new file mode 100644
index 00000000000..2af4b55de1a
--- /dev/null
+++ b/source/blender/compositor/operations/COM_ConvertPremulToStraightOperation.cpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2012, 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_ConvertPremulToStraightOperation.h"
+#include "BLI_math.h"
+
+ConvertPremulToStraightOperation::ConvertPremulToStraightOperation() : NodeOperation()
+{
+	this->addInputSocket(COM_DT_COLOR);
+	this->addOutputSocket(COM_DT_COLOR);
+
+	this->m_inputColor = NULL;
+}
+
+void ConvertPremulToStraightOperation::initExecution()
+{
+	this->m_inputColor = getInputSocketReader(0);
+}
+
+void ConvertPremulToStraightOperation::executePixel(float output[4], float x, float y, PixelSampler sampler)
+{
+	float inputValue[4];
+	float alpha;
+
+	this->m_inputColor->read(inputValue, x, y, sampler);
+	alpha = inputValue[3];
+
+	if (fabsf(alpha) < 1e-5f) {
+		zero_v3(output);
+	}
+	else {
+		mul_v3_v3fl(output, inputValue, 1.0f / alpha);
+	}
+
+	/* never touches the alpha */
+	output[3] = alpha;
+}
+
+void ConvertPremulToStraightOperation::deinitExecution()
+{
+	this->m_inputColor = NULL;
+}