1 files changed, 79 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_LuminanceMatteOperation.cpp b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cpp
new file mode 100644
index 00000000000..7850a631212
--- /dev/null
+++ b/source/blender/compositor/operations/COM_LuminanceMatteOperation.cpp
@@ -0,0 +1,79 @@
+/*
+ * 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_LuminanceMatteOperation.h"
+#include "BLI_math.h"
+
+LuminanceMatteOperation::LuminanceMatteOperation(): NodeOperation() {
+	addInputSocket(COM_DT_COLOR);
+	addOutputSocket(COM_DT_VALUE);
+
+	inputImageProgram = NULL;
+}
+
+void LuminanceMatteOperation::initExecution() {
+	this->inputImageProgram = this->getInputSocketReader(0);
+}
+
+void LuminanceMatteOperation::deinitExecution() {
+	this->inputImageProgram= NULL;
+}
+
+void LuminanceMatteOperation::executePixel(float* outputValue, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
+	float inColor[4];
+
+	const float high=this->settings->t1;
+	const float low=this->settings->t2;
+
+	float alpha;
+
+	this->inputImageProgram->read(inColor, x, y, sampler, inputBuffers);
+	
+	/* one line thread-friend algorithm:
+	outputValue[0] = max(inputValue[3], min(high, max(low, ((inColor[0]-low)/(high-low))))
+	*/
+		
+	/* test range*/
+	if(inColor[0] > high) {
+		alpha=1.f;
+	}
+	else if(inColor[0] < low){
+		alpha=0.f;
+	}
+	else {/*blend */
+		alpha=(inColor[0]-low)/(high-low);
+	}
+
+
+	/* store matte(alpha) value in [0] to go with
+	 * COM_SetAlphaOperation and the Value output
+	 */
+
+	/* don't make something that was more transparent less transparent */
+	if (alpha<inColor[3]) {
+		outputValue[0]=alpha;
+	}
+	else {
+	/* leave now it was before */
+		outputValue[0]=inColor[3];
+	}
+}
+