1 files changed, 76 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cpp b/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cpp
new file mode 100644
index 00000000000..b853c28136f
--- /dev/null
+++ b/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cpp
@@ -0,0 +1,76 @@
+/*
+ * 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_ColorBalanceLGGOperation.h"
+#include "BLI_math.h"
+
+
+inline float colorbalance_lgg(float in, float lift_lgg, float gamma_inv, float gain)
+{
+	/* 1:1 match with the sequencer with linear/srgb conversions, the conversion isnt pretty
+	 * but best keep it this way, sice testing for durian shows a similar calculation
+	 * without lin/srgb conversions gives bad results (over-saturated shadows) with colors
+	 * slightly below 1.0. some correction can be done but it ends up looking bad for shadows or lighter tones - campbell */
+	float x= (((linearrgb_to_srgb(in) - 1.0f) * lift_lgg) + 1.0f) * gain;
+
+	/* prevent NaN */
+	if (x < 0.f) x = 0.f;
+
+	return powf(srgb_to_linearrgb(x), gamma_inv);
+}
+
+ColorBalanceLGGOperation::ColorBalanceLGGOperation(): NodeOperation() {
+	this->addInputSocket(COM_DT_VALUE);
+	this->addInputSocket(COM_DT_COLOR);
+	this->addOutputSocket(COM_DT_COLOR);
+	this->inputValueOperation = NULL;
+	this->inputColorOperation = NULL;
+	this->setResolutionInputSocketIndex(1);
+}
+
+void ColorBalanceLGGOperation::initExecution() {
+	this->inputValueOperation = this->getInputSocketReader(0);
+	this->inputColorOperation = this->getInputSocketReader(1);
+}
+
+void ColorBalanceLGGOperation::executePixel(float* outputColor, float x, float y, PixelSampler sampler, MemoryBuffer *inputBuffers[]) {
+	float inputColor[4];
+	float value[4];
+	
+	inputValueOperation->read(value, x, y, sampler, inputBuffers);
+	inputColorOperation->read(inputColor, x, y, sampler, inputBuffers);
+	
+	float fac = value[0];
+	fac = min(1.0f, fac);
+	const float mfac= 1.0f - fac;
+	
+	outputColor[0] = mfac*inputColor[0] + fac * colorbalance_lgg(inputColor[0], this->lift[0], this->gamma_inv[0], this->gain[0]);
+	outputColor[1] = mfac*inputColor[1] + fac * colorbalance_lgg(inputColor[1], this->lift[1], this->gamma_inv[1], this->gain[1]);
+	outputColor[2] = mfac*inputColor[2] + fac * colorbalance_lgg(inputColor[2], this->lift[2], this->gamma_inv[2], this->gain[2]);
+	outputColor[3] = inputColor[3];
+
+}
+
+void ColorBalanceLGGOperation::deinitExecution() {
+	this->inputValueOperation = NULL;
+	this->inputColorOperation = NULL;
+}