1 files changed, 81 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_ColorMatteOperation.cc b/source/blender/compositor/operations/COM_ColorMatteOperation.cc
new file mode 100644
index 00000000000..17ada8d89b2
--- /dev/null
+++ b/source/blender/compositor/operations/COM_ColorMatteOperation.cc
@@ -0,0 +1,81 @@
+/*
+ * 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_ColorMatteOperation.h"
+#include "BLI_math.h"
+
+ColorMatteOperation::ColorMatteOperation()
+{
+  addInputSocket(COM_DT_COLOR);
+  addInputSocket(COM_DT_COLOR);
+  addOutputSocket(COM_DT_VALUE);
+
+  this->m_inputImageProgram = nullptr;
+  this->m_inputKeyProgram = nullptr;
+}
+
+void ColorMatteOperation::initExecution()
+{
+  this->m_inputImageProgram = this->getInputSocketReader(0);
+  this->m_inputKeyProgram = this->getInputSocketReader(1);
+}
+
+void ColorMatteOperation::deinitExecution()
+{
+  this->m_inputImageProgram = nullptr;
+  this->m_inputKeyProgram = nullptr;
+}
+
+void ColorMatteOperation::executePixelSampled(float output[4],
+                                              float x,
+                                              float y,
+                                              PixelSampler sampler)
+{
+  float inColor[4];
+  float inKey[4];
+
+  const float hue = this->m_settings->t1;
+  const float sat = this->m_settings->t2;
+  const float val = this->m_settings->t3;
+
+  float h_wrap;
+
+  this->m_inputImageProgram->readSampled(inColor, x, y, sampler);
+  this->m_inputKeyProgram->readSampled(inKey, x, y, sampler);
+
+  /* Store matte(alpha) value in [0] to go with
+   * COM_SetAlphaMultiplyOperation and the Value output.
+   */
+
+  if (
+      /* do hue last because it needs to wrap, and does some more checks  */
+
+      /* sat */ (fabsf(inColor[1] - inKey[1]) < sat) &&
+      /* val */ (fabsf(inColor[2] - inKey[2]) < val) &&
+
+      /* multiply by 2 because it wraps on both sides of the hue,
+       * otherwise 0.5 would key all hue's */
+
+      /* hue */ ((h_wrap = 2.0f * fabsf(inColor[0] - inKey[0])) < hue || (2.0f - h_wrap) < hue)) {
+    output[0] = 0.0f; /* make transparent */
+  }
+
+  else {                    /*pixel is outside key color */
+    output[0] = inColor[3]; /* make pixel just as transparent as it was before */
+  }
+}