1 files changed, 78 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_BrightnessOperation.cpp b/source/blender/compositor/operations/COM_BrightnessOperation.cpp
new file mode 100644
index 00000000000..bb481f71cc1
--- /dev/null
+++ b/source/blender/compositor/operations/COM_BrightnessOperation.cpp
@@ -0,0 +1,78 @@
+/*
+ * 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: 
+ *		Jeroen Bakker 
+ *		Monique Dewanchand
+ */
+
+#include "COM_BrightnessOperation.h"
+
+BrightnessOperation::BrightnessOperation(): NodeOperation() {
+	this->addInputSocket(COM_DT_COLOR);
+	this->addInputSocket(COM_DT_VALUE);
+	this->addInputSocket(COM_DT_VALUE);
+	this->addOutputSocket(COM_DT_COLOR);
+	this->inputProgram = NULL;
+}
+void BrightnessOperation::initExecution() {
+	this->inputProgram = this->getInputSocketReader(0);
+	this->inputBrightnessProgram = this->getInputSocketReader(1);
+	this->inputContrastProgram = this->getInputSocketReader(2);
+}
+
+void BrightnessOperation::executePixel(float* color, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
+	float inputValue[4];
+	float a, b;
+	float inputBrightness[4];
+	float inputContrast[4];
+	this->inputProgram->read(inputValue, x, y, sampler, inputBuffers);
+	this->inputBrightnessProgram->read(inputBrightness, x, y, sampler, inputBuffers);
+	this->inputContrastProgram->read(inputContrast, x, y, sampler, inputBuffers);
+	float brightness = inputBrightness[0];
+	float contrast = inputContrast[0];
+	brightness /= 100.0f;
+	float delta = contrast / 200.0f;
+	a = 1.0f - delta * 2.0f;
+	/*
+	* The algorithm is by Werner D. Streidt
+	* (http://visca.com/ffactory/archives/5-99/msg00021.html)
+	* Extracted of OpenCV demhist.c
+	*/
+	if( contrast > 0 )
+	{
+		a = 1.0f / a;
+		b = a * (brightness - delta);
+	}
+	else
+	{
+		delta *= -1;
+		b = a * (brightness + delta);
+	}
+	
+	color[0] = a*inputValue[0]+b;
+	color[1] = a*inputValue[1]+b;
+	color[2] = a*inputValue[2]+b;
+	color[3] = inputValue[3];
+}
+
+void BrightnessOperation::deinitExecution() {
+	this->inputProgram = NULL;
+	this->inputBrightnessProgram = NULL;
+	this->inputContrastProgram = NULL;
+}
+