1 files changed, 60 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ConvertPremulToKeyOperation.cpp b/source/blender/compositor/operations/COM_ConvertPremulToKeyOperation.cpp
new file mode 100644
index 00000000000..6f676b1c404
--- /dev/null
+++ b/source/blender/compositor/operations/COM_ConvertPremulToKeyOperation.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_ConvertPremulToKeyOperation.h"
+#include "BLI_math.h"
+
+ConvertPremulToKeyOperation::ConvertPremulToKeyOperation(): NodeOperation() {
+	this->addInputSocket(COM_DT_COLOR);
+	this->addOutputSocket(COM_DT_COLOR);
+
+	this->inputColor = NULL;
+}
+
+void ConvertPremulToKeyOperation::initExecution() {
+	this->inputColor = getInputSocketReader(0);
+}
+
+void ConvertPremulToKeyOperation::executePixel(float* outputValue, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
+	float inputValue[4];
+	float alpha;
+
+	this->inputColor->read(inputValue, x, y, sampler, inputBuffers);
+	alpha = inputValue[3];
+
+	if(fabsf(alpha) < 1e-5f) {
+		outputValue[0]= 0.f;
+		outputValue[1]= 0.f;
+		outputValue[2]= 0.f;
+	}
+	else {
+		outputValue[0] = inputValue[0] / alpha;
+		outputValue[1] = inputValue[1] / alpha;
+		outputValue[2] = inputValue[2] / alpha;
+	}
+
+	/* never touches the alpha */
+	outputValue[3] = alpha;
+}
+
+void ConvertPremulToKeyOperation::deinitExecution() {
+	this->inputColor = NULL;
+}