1 files changed, 86 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cc b/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cc
new file mode 100644
index 00000000000..934b7e51aee
--- /dev/null
+++ b/source/blender/compositor/operations/COM_ColorBalanceLGGOperation.cc
@@ -0,0 +1,86 @@
+/*
+ * 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.
+ *
+ * Copyright 2011, Blender Foundation.
+ */
+
+#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, since 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 < 0.0f) {
+    x = 0.0f;
+  }
+
+  return powf(srgb_to_linearrgb(x), gamma_inv);
+}
+
+ColorBalanceLGGOperation::ColorBalanceLGGOperation()
+{
+  this->addInputSocket(COM_DT_VALUE);
+  this->addInputSocket(COM_DT_COLOR);
+  this->addOutputSocket(COM_DT_COLOR);
+  this->m_inputValueOperation = nullptr;
+  this->m_inputColorOperation = nullptr;
+  this->setResolutionInputSocketIndex(1);
+}
+
+void ColorBalanceLGGOperation::initExecution()
+{
+  this->m_inputValueOperation = this->getInputSocketReader(0);
+  this->m_inputColorOperation = this->getInputSocketReader(1);
+}
+
+void ColorBalanceLGGOperation::executePixelSampled(float output[4],
+                                                   float x,
+                                                   float y,
+                                                   PixelSampler sampler)
+{
+  float inputColor[4];
+  float value[4];
+
+  this->m_inputValueOperation->readSampled(value, x, y, sampler);
+  this->m_inputColorOperation->readSampled(inputColor, x, y, sampler);
+
+  float fac = value[0];
+  fac = MIN2(1.0f, fac);
+  const float mfac = 1.0f - fac;
+
+  output[0] = mfac * inputColor[0] +
+              fac * colorbalance_lgg(
+                        inputColor[0], this->m_lift[0], this->m_gamma_inv[0], this->m_gain[0]);
+  output[1] = mfac * inputColor[1] +
+              fac * colorbalance_lgg(
+                        inputColor[1], this->m_lift[1], this->m_gamma_inv[1], this->m_gain[1]);
+  output[2] = mfac * inputColor[2] +
+              fac * colorbalance_lgg(
+                        inputColor[2], this->m_lift[2], this->m_gamma_inv[2], this->m_gain[2]);
+  output[3] = inputColor[3];
+}
+
+void ColorBalanceLGGOperation::deinitExecution()
+{
+  this->m_inputValueOperation = nullptr;
+  this->m_inputColorOperation = nullptr;
+}