1 files changed, 82 insertions, 0 deletions
diff --git a/source/blender/compositor/operations/COM_PosterizeOperation.cc b/source/blender/compositor/operations/COM_PosterizeOperation.cc
new file mode 100644
index 00000000000..db5860f48f8
--- /dev/null
+++ b/source/blender/compositor/operations/COM_PosterizeOperation.cc
@@ -0,0 +1,82 @@
+/*
+ * 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 2021, Blender Foundation.
+ */
+
+#include "COM_PosterizeOperation.h"
+
+namespace blender::compositor {
+
+PosterizeOperation::PosterizeOperation()
+{
+  this->addInputSocket(DataType::Color);
+  this->addInputSocket(DataType::Value);
+  this->addOutputSocket(DataType::Color);
+  this->m_inputProgram = nullptr;
+  this->m_inputStepsProgram = nullptr;
+  flags.can_be_constant = true;
+}
+
+void PosterizeOperation::initExecution()
+{
+  this->m_inputProgram = this->getInputSocketReader(0);
+  this->m_inputStepsProgram = this->getInputSocketReader(1);
+}
+
+void PosterizeOperation::executePixelSampled(float output[4],
+                                             float x,
+                                             float y,
+                                             PixelSampler sampler)
+{
+  float inputValue[4];
+  float inputSteps[4];
+
+  this->m_inputProgram->readSampled(inputValue, x, y, sampler);
+  this->m_inputStepsProgram->readSampled(inputSteps, x, y, sampler);
+  CLAMP(inputSteps[0], 2.0f, 1024.0f);
+  const float steps_inv = 1.0f / inputSteps[0];
+
+  output[0] = floor(inputValue[0] / steps_inv) * steps_inv;
+  output[1] = floor(inputValue[1] / steps_inv) * steps_inv;
+  output[2] = floor(inputValue[2] / steps_inv) * steps_inv;
+  output[3] = inputValue[3];
+}
+
+void PosterizeOperation::update_memory_buffer_partial(MemoryBuffer *output,
+                                                      const rcti &area,
+                                                      Span<MemoryBuffer *> inputs)
+{
+  for (BuffersIterator<float> it = output->iterate_with(inputs, area); !it.is_end(); ++it) {
+    const float *in_value = it.in(0);
+    const float *in_steps = it.in(1);
+    float steps = in_steps[0];
+    CLAMP(steps, 2.0f, 1024.0f);
+    const float steps_inv = 1.0f / steps;
+
+    it.out[0] = floor(in_value[0] / steps_inv) * steps_inv;
+    it.out[1] = floor(in_value[1] / steps_inv) * steps_inv;
+    it.out[2] = floor(in_value[2] / steps_inv) * steps_inv;
+    it.out[3] = in_value[3];
+  }
+}
+
+void PosterizeOperation::deinitExecution()
+{
+  this->m_inputProgram = nullptr;
+  this->m_inputStepsProgram = nullptr;
+}
+
+}  // namespace blender::compositor